JP2010031997A - Device for adjusting telescopically movable element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive device for adjusting a telescopically movable element like a shaft of a tool. <P>SOLUTION: The device includes an inner element 1 and an outer element. The inner element 1 is axially movable with respect to the outer element 3. One end of the outer element has a lock member 4 mutually locking the inner element 1 and the outer element. The lock member 4 can be operated by an operating member 5 spaced from the lock member 4 in a direction of the other end of the outer element, through an affecting member movable along an axis in parallel to a vertical axis of the outer element or rotatable around the axis. An upper part of the operating member is in a shape of push button, and the affecting member has a pipe completely or partially surrounding the outer element. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a locking device having two elements which can be adjusted in length and are slidable relative to each other, like a tool shaft. The shaft includes a locking member at one end of the outer element. The locking member can be moved along an axis parallel to the longitudinal axis of the outer element or can be pivoted about the axis from the locking member to the other end of the outer element. It can be operated using operating members that are spaced apart in the direction.

  International Publication No. WO 02/18802 A1 (Patent Document 1) describes a device that is mainly adapted to a tool shaft having a telescopic function. The device includes a tubular element, an inner element and an outer element that can be locked together. Locking is accomplished using a locking member that is securely attached to the end of the outer element. Release of the lock is performed using an operating member at the other end of the outer element. The release force is transmitted using action members between both ends of the outer element. In this description, various modifications of the working member have been proposed. A preferred embodiment of the working member is a thin steel strip inserted between the inner and outer elements.

This embodiment works well, but is expensive to produce. Not only is the cost of steel strips that require opening and cutting high, it is also cumbersome and time consuming to install. The remaining variant of the conventional working member does not result in a significant reduction in production costs.
In addition to the locking details, the tube system accounts for the majority of the cost. In particular, the outer element is expensive. One reason is that the durability and surface requirements of the outer element are stringent. The outer element is usually made of hardened aluminum that has been surface treated in a specific way. It must be able to withstand normal handling without damage, and therefore requires a thickness of at least 1 millimeter. Furthermore, it is desirable to paint the surface for use for gripping purposes. Anodized surfaces are also used, but are cold when gripped.

International Publication WO02 / 18802A1

  The object of the present invention is to realize an apparatus according to the inlet means which can be produced at a significantly lower cost than the previously known variants.

  This object is achieved by a locking device having two elements that can slide relative to each other, such as a tool shaft, the length of which can be adjusted. The shaft has a locking member on the outer element at one end. The locking member is separated from the locking member in the direction of the other end of the outer element via an action member that is movable along an axis parallel to the longitudinal axis of the outer element or is rotatable about the axis. It can be operated using an operating member. The working member includes a tube made of a polymeric material. The tube surrounds the outer element, which has a thin metal tube, preferably of hardened aluminum.

FIG. 1 shows the configuration of a tool shaft comprising an inner element 1 with a connecting hole 2 for connecting a suitable tool. The inner element 1 is detachably locked to the outer element 3 using a lock member 4 surrounded by a protective housing 71. A handle having a pivotable peg 70 on which a U-shaped operation member is pivotably mounted is attached to the lower portion of the outer element 3. The outer element 3 has an inner metal tube and an outer plastic tube surrounding the metal tube. This plastic tube has the dual function of providing the desired surface and also acting as a working member.
The release force of the operation member 5 can be transmitted to the lock member 4 using a plastic tube. The function of the locking member 4 will be described in detail in the following description.

  FIG. 2 is a side view of the locking member. This member is substantially the same as the locking member shown in FIGS. 2 to 5, 39 to 41 and 45 of International Publication WO02 / 18802A1. The difference is that the attachment collar 10 is extended with a flange that forms a space 305 in which the outer tube can move freely. This flange has a groove 19 for receiving an engagement tap according to the following description.

  The release device shown in FIG. 3 includes a wedge 14, an outer plastic tube 301 and an operating member 5. The wedge 14 includes two wedge elements that cooperate with corresponding wedge-shaped grooves (FIG. 2) in the groove 13 and an extension 73 that terminates in an engagement peg 307 in accordance with known techniques. The outer tube 301 is preferably formed of extruded polypropylene that can be reinforced and colored. This means that an insulating, impact resistant surface having the desired color is provided. The cost of the outer tube corresponds to the cost of the varnish layer applied to the aluminum tube. The outer tube 301 has an upper end including a hole 308 into which the engagement peg 307 is fitted. The described locking member requires a tensile force of about 120N. However, although the dimensions of the hole 308 are considered here, the pressure on the hole is so low that the polypropylene material is not overloaded during the relatively short release process.

  The operating member 5 shown in FIG. 3 is preferably made by injection molding of a suitable plastic material and is thus shaped like a curved U profile with two flanges 61. Through holes 26 are drawn in these flanges. These holes 26 define the rotation center of the operation member 5. The operating member 5 is provided with an extension 303 made of the same piece as this operating member, which is very convenient. The extension 303 includes a landing portion 304 that can be provided at its uppermost end with an engaging peg that is hooked into a corresponding hole in the tube 301. However, the raised portion 304 preferably has a smooth lower surface that is welded to the tube 301.

FIG. 4 shows how the inner tube 1 is inserted through the locking member 4 and an inner metal tube 302, preferably made of hardened aluminum.
The inner metal tube 302 is inserted into the hole 306 in the attachment collar 10 and is thereby securely attached to the locking member 4. At its lower end, the tube 302 is inserted into the corresponding bottom hole of the handle 6 according to FIG. The tube 302 has a function of absorbing axial force and rotational bending moment after holding the handle 6 together with the lock member 4. Further, the tube 302 has a passage for the inner tube 1.

The outer plastic tube 301 is mounted over the tube 302 with some play allowing the tube 301 to slide axially relative to the tube 302.
The upper end of the tube 301 is inserted into the tubular space 305 in the attachment collar 10 with play.
The engagement peg 307 of the extension 73 of the wedge 14 is hooked into the hole 308 of the tube 301 through an opening in the form of the track 19 of the attachment collar 10. Therefore, the wedge 14 can be pulled in the axial direction via the tube 301. Therefore, the wedge 14 is held in place by a protective housing 71 (not shown) that allows it to move with some play without detaching from the track 13 (according to FIG. 2).

In the lower part, the tube 301 is inserted into the tubular flange of the handle 6 with some play. The flange is provided with an axial groove 309 that provides space for the landed portion 304 of the extension 303 of the operating member 5. Thus, during the release process, the ridge 304 can move freely in the axial direction, but is still supported on both sides, so that the rotational moment on the tube 301 is received in the handle 6 and the tube 302 To the lock member 4. The locking member 4 transmits a rotational moment to the inner element 1 when in the locked position. As described above, the land raising portion 304 is preferably welded to the pipe 301.
Welding is suitably performed by using ultrasonic welding after the components are installed. In this way, dimensional tolerances of the included components that affect the length of releasing the wedge 14 can be eliminated.

The groove 309 is open upward so that the ridge 304 can be inserted therefrom. Furthermore, the groove 309 can be provided with an outward hole in the correct direction of FIG. 5 (not shown), so that a welding point can be inserted therefrom.
The operating member is placed outside the rotatable peg. The upper part of the operating member has a clamp that is pivoted into the groove 310 of the handle 6 during the release process. The handle 6 is only partially shown in FIG. 5, but is preferably made seamlessly by injection molding with a suitable polymeric material such as polypropylene.

6 and 7 show the upper and lower parts of the device in the release position. When the operating member 5 is pressed in the direction of arrow J, the extension 303 is pulled in the direction of arrow K. As a result, the extension 303 is curved. Fatigue problems do not occur if appropriate plastic materials are used.
The extension 303 pulls the tube 301 in the direction of arrow K. As a result, the wedge 14 is pulled in the direction of arrow L and the locking member 4 is released, so that the inner element 1 can slide freely in the direction of arrow M and rotate in the direction of N. When the operating member 5 is released, the spring element in the locking member 4 returns the system, the wedge 14, the tube 301 and the operating member 5 to an unaffected position according to FIGS.

  One important aspect of the present invention is surprisingly the beneficial effect of the combination of an inexpensive plastic tube 301 and an inexpensive metal tube 302, which provides the desired surface of interest. It has a dual function that also serves as the action member 5, and the release force from the operation member 5 can be transmitted to the lock member 4 using this plastic tube. The plastic tube 301 can be relatively thin, and when the wedge 14 is attached to the tube 301 according to the above, a thickness of about 1.5 mm is preferred. When the extension 73 of the wedge 14 is welded to the pipe 301, the thickness of this piece can be reduced.

  Although plastic tubes are light and inexpensive, they nevertheless provide strong impact protection for the metal tube 302, which can result in the metal tube 302 being thin and thus lightweight and inexpensive. The elimination of the surface treatment of the tube 302 is particularly advantageous with respect to production costs. The overall effect, including a significant reduction in assembly time, is a production cost of 30-40% compared to known techniques.

  Although the present invention is used for a special type of locking member in the above description, it can of course be used for various types of locking members that allow remote control of the locking function. Furthermore, the present invention may be further modified within the scope of the claims, as will be apparent to those skilled in the art.

The present invention can be modified as follows within the scope of the claims.
FIGS. 8 and 9 are side views of the device with the tensioning member in the closed and open positions, respectively. This device comprises an inner element 1 which can be provided with a connecting hole 2 for attaching a suitable tool, as described above. The inner element 1 is detachably locked to the outer element using the lock member 4 surrounded by the protective housing 71. The outer element 3 includes an inner metal tube 302 and an outer plastic tube surrounding the metal tube. This plastic tube has the function described above and is terminated by a pulling flange 5 which acts as an operating member. In the absence of a pulling flange, the main part of the tube 301 can function as an operating member.

  The pulling operation member is premised on that the transmission force is significantly smaller than 120N. The lower operating force applied to the locking type described can be achieved by reducing the wedge angle of the wedge 14. In empirical tests, when the angle between the wedge surfaces is about 10 degrees, the wedge is polyamide plastic, and the opposing surface is acetal plastic, the operating force is reduced to about 30-40 N without causing component stagnation. Showed that it can. This is a force that can be easily applied to the grips discussed here. In the case of the lock type depending on the shape, the tensile force can be further reduced.

When this device is used as a tool shaft, the user holds the handle with one hand and the plastic tube 301 with the other hand. The device is then usually brought with the handle 6 up.
When working with a tool, such as moping the floor with a mop pattern, the upper hand is on the handle 6 and the lower hand is placed at the appropriate position on the tube 301. This position depends on the individual working posture. A minimum distance of about 20 cm is required to be able to achieve a sufficient lever arm. The tool shaft means the upper part of the shaft below the handle, which is usually rarely gripped by the user. This of course assumes that the length of the shaft can be adjusted. Therefore, since the plastic tube 301 is terminated just below the handle 6, even if it is desirable to apply some surface treatment to the visible portion of the tube 302, the weight can be reduced and the production cost can be reduced.

  During the adjustment, the operator moves the lower hand to the operation member 5 and pulls it in the direction of the arrow K against the resistance from the upper hand on the handle 6. As a result, the locking member 4 is released, so that the inner element 1 can slide freely in the direction of the arrow M. Because the force requirement is relatively low, the operator can also choose to place the lower hand in a grip position near the tube 301 and pull it upward. Therefore, this adjustment can be made without changing the grip. Even when the operator pulls the lower hand to the flange 5, this adjustment is performed with almost no change in grip. This is because the hand can control the shaft and the hand slides along the tube 301. Therefore, operation during continuous work can be performed considerably more easily than when the upper hand uses the operation member.

While locked, the operator releases the tension grip near the tube 301. In this way, the spring element in the locking member 4 returns the system, the wedge 14, the tube 301 and the operating member 5 to an unaffected position.
The operating distance for this described locking type with the above wedge angle is about 20 mm. The space between the operating member 5 and the handle 6 makes it possible, of course, to use long operating distances. This is a great advantage in production technology because the locking device is not affected by tolerances in the cut length of the tube. A further production engineering advantage is a simple structure with a small number of parts that can be easily assembled.

The invention can be modified in various ways within the scope of the claims. For example, the tube 301 can be shorter than that shown in FIGS. For example, it can be imagined that this tube becomes the protective housing 71 by making the protective housing movable in the axial direction and functioning as the operating member 5.
The tube 301 can of course be formed of other materials such as metal, even if a polymeric material is preferred. Low operating force allows the use of materials such as renewable materials that have relatively low stiffness and durability.
Furthermore, the tube 302 can be made of a material other than metal, such as a polymeric material or a renewable material.
Furthermore, the operating member 5 can be changed in various ways with respect to both the operating principle and the geometric shape. These and other variations that are apparent to one skilled in the art are included within the scope of the claims.

  The present invention can also be used on a tool shaft having inner and outer tubular elements in the form of a telescopically adjustable vacuum cleaner shaft. Due to the requirement of free flow of air through the inner element, only locking members that affect the outer mantle surface of the inner element can be used for this application. A locking member that dominates the market is a form locking type that cleverly utilizes a locking groove embossed on the inner element. This type of lock has many disadvantages. For example, the lock groove suppresses the air flow. Another disadvantage is that the lock groove cooperates with the lock body that slides in contact with the groove while adjusting the shaft length. This creates noise. Another disadvantage is that the shaft length cannot be adjusted by infinitely variable means.

  A further disadvantage is that the foam lock requires that the inner and outer elements are each permanently fixed with respect to each other with respect to rotation using an axial groove. Therefore, adjusting the angle between the inner and outer elements, which may be desirable, is often desirable because the vacuum cleaner hose is often connected to the vacuum cleaner shaft using a curved tube that can be in the way. Impossible. A further disadvantage is that it is expensive to produce both locking grooves and axial grooves. These disadvantages are eliminated using the device according to FIGS.

  According to FIG. 10, the locking member includes a jaw 9 having an inner friction surface 12, a spring element 11, and an attachment collar 10, which are shown in FIGS. 2 to 2 of WO 02 / 18802A1. 5, 39 to 41 and 45 are substantially the same as the locking member. The difference is that the attachment collar 10 is extended with a flange having an outer mantle surface containing an axial guide groove 400 for the working member 7 according to FIGS.

  One end of the action member 7 is provided with an extension 73 attached to the wedge 14. At the other end, the action member 7 is attached to the operation member 5 adapted to be moved in the axial direction with the thumb of the operator. Therefore, the shelf 401 protruding outward provides a support portion that forms a grip surface depending on the shape so that the operation member 5 can be easily adjusted. The difference from the known technique is that the jaw 9 in this case also includes an outwardly facing lip 402 provided with an opposing wedge surface 203. These wedge surfaces 203 may be flat according to known techniques or may be curved according to FIG.

  These wedge surfaces 203 cooperate with the outwardly facing wedge surface 204 of the wedge 14 of FIG. This is because the angle between the wedge surfaces 204 can be reduced according to the previous explanation when using the appropriate material, so that the required operating force is so small that it is easily achieved by the operator's thumb. Because it can.

  The curved wedge surface 203 allows the use of various wedge angles of the wedge 14. For example, it may be desirable to have a large angle in the first part of the operating distance and a small angle in the last part of the operating distance. This provides a constant or diminishing operating force that may be desirable for ergonomic reasons. The sliding of the wedge 14 sliding between the outwardly facing jaws 402 results in a greater tangential force derived from the wedge 14 towards the jaw 9 compared to the situation when the known technique is used according to FIG. It means that the radius R is affected.

  In this way, a greater exchange of operating force is realized compared to known techniques. Combining a larger radius with the selection of the appropriate material and a smaller wedge angle allows the device to be included in the locking member, and the exchange of operating force is not configured to enhance the external lever arm or other external force Can be realized. This is particularly advantageous because it simplifies manufacturing due to reduced parts and reduced tolerance requirements. Furthermore, the degree of freedom of using various control principles and various design shapes of operation members such as the operation members controlled by the thumb according to the above description is increased. This is not clear in view of known techniques.

  FIG. 13 shows the outer element 3 inserted into the attachment collar 10 of the locking member 4 and secured in a suitable manner to this attachment collar. The outer element 3 in this case comprises an outer tube of a vacuum cleaner pipe which is preferably directed downwardly and connected to the nozzle of the vacuum cleaner. The inner element 1 is then directed to the upper operator and connected to the hose of the vacuum cleaner. The inner element 1 is inserted into the outer element 3 and locked in a known manner to the jaws 9 of the locking member 4 as shown in FIG. The jaw 9 and its cooperating components are protected by a housing 71 that surrounds them.

  There is space in the jaw 9 and housing 71 where the wedge 14 and attached components can slide. When it is desirable to adjust the length of the shaft of the vacuum cleaner, the operator holds the outer mantle surface of the housing 71 and the attachment collar 10 and then projects the operating member 5 outward according to FIG. The support unit of the shelf 401 is used to slide in the direction of arrow K. The wedge 14 then slides between the outwardly facing lips 402 so that the jaws 9 are pushed away. Thereafter, the outer element 3 can be adjusted to the desired position in the direction of the arrows M and N relative to the inner element 1. This assumes that the operator holds the inner element firmly with the other hand, which is a common means of adjusting the length of the pipe of the vacuum cleaner.

  FIGS. 15 and 16 illustrate several embodiments discussed in connection with a vacuum cleaner shaft. FIG. 15 shows a locking device having a bidirectional wedge 14 attached to the inner mantle surface of the housing 71. When the operator grips the housing 71 and moves it in the direction of arrow K, the wedge 14 also moves in the direction of arrow K. As a result, the lock is released, and the outer element 3 slides relative to the inner element 1 in the same direction as the adjustment direction of the housing 71 under the influence of the force from the wedge surface. In this case, the housing 71 becomes the operation member 5. This adjustment of the relative position of the outer element 3 with respect to the inner element 1 can be done in either direction thanks to the bidirectional wedge.

  FIG. 16 shows an embodiment in which the operating member 5 moves in the direction of the free end of the inner element 1 when the lock is released. This allows the inner element to be directed downward, which may be preferable in connection with the shaft of the vacuum cleaner.

  Although the present invention has been described so far in connection with the shaft of a vacuum cleaner, it can of course be used in completely different applications where the inner and outer tubes can be releasably locked together.

  The embodiment of FIGS. 17 and 18 is particularly suitable in connection with the application of the present invention which opens to the shaft of a vacuum adjustable vacuum cleaner.

  The above combination of the present invention of the locking member and the working member acting on the outer mantle surface of the inner element, as well as the operating member outside the outer element, are very suitable for the shaft of the vacuum cleaner which can be telescopically adjusted . In this way, the inner element can have a free passage of air and at the same time the mantle surface of the outer element does not need to be opened, but can be sealed against the inner element. A conical portion 403 may be provided at the lower end of the inner element 1 or to receive a vacuum cleaner nozzle, such as a nozzle 405 having an extension 404 according to the lower left of FIG. It may be.

  A seal 408 that seals against the inner tube 302 is suitably provided on the upper part of the inner element 1 according to the partial cross-sectional view on the right side of FIG. It is preferable that the seal 408 can be easily removed so that when the locking member 4 is released, the inner element 1 falls by its own weight at least using the weight of the nozzle of the vacuum cleaner. Accordingly, the inner element 1 is movable inside the inner tube 302. The lock member 4 is attached to the lower part of the tube 302. This locking member can releasably hold the inner element 1. A curved tube 406 can be inserted into the upper portion of the inner tube 302 by a known method. The curved tube 406 can be properly terminated within the hose 407 of the vacuum cleaner. The working member in the form of the outer tube 301 partially surrounds the inner tube 302 with some play. An operating member in the form of a pulling flange 5 is arranged on the top of the tube 301. The lower part of the tube 301 is connected to the locking member 4, so that the locking member 4 is released when the tube 301 is pulled in the direction of arrow K.

The lock types that are generally available on the market can be used as the locking member, but preferably the friction lock according to the invention is used.
As described above, the outer tube 301 can be attached to the housing 71. In this case, the housing 71 surrounds the lock member 4 and is movable in the axial direction with a slight play around it.

  The wedge 14 can be attached to the inner mantle surface of the housing 71 according to FIG. Therefore, in this application example, it is preferable that the wedge 14 can be operated in one direction so that the locking member 4 can be released in the direction of the arrow K by the axial movement of the outer tube 301.

Alternatively, the extension 73 of the wedge 14 according to FIG. 11 is further extended and attached to the outer tube 301. In either case, the locking member is released in the direction of arrow K when the operator pulls the pulling flange 5 or the outer tube 301 upward. This releases the inner element and allows it to move in the direction of arrow M.
At that time, it is also possible to rotate the inner element with respect to the lock member 4. The wedge may of course be oriented according to FIG. 16 so that the release is performed by the operator pushing the tube 301 in the direction opposite to the direction of arrow K. This device allows the shaft of the vacuum cleaner to be adjusted quickly and reliably without having to bend by the operator.

FIG. 18 shows the shaft of a vacuum cleaner in which the working member 7 includes a bar that runs adjacent to the tube 302. The cross section of the bar can have a geometry that partially surrounds the tube 302. If the surrounding angle exceeds 180 degrees, the bar can be snapped onto the tube 302, which can be advantageous during assembly. The bar can also be shaped such that it includes one or many components that surround the tube 302 at an angle greater than 180 degrees, and these components have a smaller cross-sectional area. It is appropriate that the operation member 5 is attached to the upper portion of the bar 7.
In all embodiments, the bar runs with little friction with the tube 302 while moving in the direction of the arrow K in the axial direction. The tube 302 then has the same function as the tube 301 but can be made with less material. An advantage with a fully coated tube 301 is that, as mentioned above, the surface treatment requirements of the tube 302 are reduced and the tube 302 can be made of a thinner material.

  It is suitable from many aspects for a telescopically movable element having a locking member that affects the outer mantle surface according to the above description. However, in some cases it is desirable in the case of a locking member acting on the inner mantle surface according to FIGS.

The upper part of the telescopically adjustable shaft shown in FIGS. 19 and 23 includes a tubular handle 6 having an opening on one side (right side in the figure), in which the operating member 5 is located. Has been inserted.
The operating member 5 is shown partially cut and has a grip portion having a U-shaped cross section. The upper portion of the operating member includes an extension 303 having a nail projection 304. These protrusions are snapped into corresponding holes in the mantle surface of the handle 6. The operating member 5 is made of injection-molded plastic, and if an appropriate material is selected, the extension 304 can act as a hinge according to the previous description. The operating member 5 also includes an arm 410 made of the same piece. The arm 410 is preferably provided with a hole for receiving the upper flange portion 411 of the rod-like action member 7. This working member 7 is preferably made of an aluminum round bar and is connected to the locking member 4 at the bottom of the shaft according to FIG.

  As external parts of the shaft, there are a handle 6, an operation member 5, an outer tube 301 and an outer element 3 according to FIG. A connection hole 2 for receiving a tool is provided in the lower part of the outer element 3. When the operator presses the handle 5 according to FIG. 33 in the direction of arrow J, the locking member is released and the outer element can move in the direction of arrow M. Since the locking member is securely attached to the inner element 1, this element can be viewed according to the figure. If this is not desired, the outer tube 301 can be extended, so that the outer tube 301 covers its upper end portion even when the outer element 3 is in the maximum extended position. However, functionally, the purpose of this outer tube is to act as a grip surface for the lower hand of the operator, so a short outer tube 301 is sufficient.

  The tube 301 can preferably be made of a polymer material, and the inner element 1 and the outer element 3 are preferably made of an aluminum tube. The inner diameter of the outer tube 301 is larger than the outer diameter of the outer element 3, so that the outer element 3 can run freely in the outer tube 301 when the lock is released. Of course, the outer tube 301 can be eliminated. However, this causes the grip surface for the operator's lower hand to be blocked by the outer element when the shaft is in the connected position.

  In order to avoid this problem, it is possible to make the outer element 3 very short so that it does not affect the normal grip surface. Since it is desirable that the maximum distance between the operator's hands is at least 50 cm, this means that the outer element 3 is made shorter as the adjustment length becomes unnecessarily shorter than the length of the normal shaft. To do. If this is acceptable, of course, it is possible to provide a larger diameter grip part in the upper part of the inner element 1 in order to provide a comfortable grip for the lower hand of the operator. Alternatively, the lower portion of the handle 6 can be extended and designed as a grip portion.

  Next, the lock member 4 will be described in more detail with reference to FIGS. FIG. 21 shows a cylinder 413 having an outer mantle surface that includes a riser in the form of a wedge 14. A cylinder 413, preferably made of injection-molded polyamide plastic, is provided with a hole having a lower end for receiving a compression spring. A small through hole 429 is provided at the lower end. The cylinder 413 equipped with a wedge is for cooperating with the sleeve 414 according to FIG.

The sleeve 414 is preferably made of injection molded acetal plastic and includes a tubular pole 417 at its top for insertion into the inner element 1 and for secure attachment thereto. The pole 417 includes an upper end having a small through hole 418. This end serves to act as a counterpart of the compression spring.
The sleeve 414 also includes a tubular intermediate part 428 whose mantle surface is intended to serve as a guide surface for the surrounding outer element 3.
The intermediate portion 428 is divided by a through groove 416 that serves as a groove for the wedge 14. The sleeve 414 includes a pair of jaws 9 at the lower part thereof. The jaw 9 is made in one piece with the sleeve 414 and is connected to the intermediate portion 428 via a relatively narrow neck 415. The jaws 9 are separated from each other by wedge-shaped grooves 13 forming opposing wedge surfaces 203 on each jaw 9. The sleeve 414 has an axial hole that runs from the lower end of the jaw 9 to the upper end of the pole 417. The hole is shaped so that the cylinder 413 can slide in the axial direction with some play.

The jaw 9 includes an outer surface layer 12 of a suitable friction material. The surface layer 12 is preferably sprayed with a material such as rubber having an appropriate hardness. A rubber tape layer is also conceivable.
The surface layer 12 only covers the part around the jaw 9 in order to ensure free passage to the outer element 3 when the lock is released.
The surface layer 12 also forms a mantle surface that is cracked into a cylinder that is unaffected and has an outer diameter slightly smaller than the inner diameter of the outer element 3. In order to further ensure the free passage of the outer element 3 when the lock is released, the jaw 9 can also include an annular elastic element 11 having a compressive effect.

  This element is fitted into a groove in the jaw 9 which is about half the height of the jaw 9. The spring element 11 is attached before applying the surface layer 12. When the cylinder 413 is attached, the upper part of the cylinder 413 is inserted into the axial hole in the sleeve 414 from below. Thus, when the wedge 14 is stopped by the jaw 9, the jaw 9 can be deflected outwardly enough to allow the cylinder 413 with the wedge 14 to pass, so that the wedge 14 is fitted into the tracks 13 and 416. In some cases, the wedge 14 can be provided with a suitable phase for easier assembly.

  FIG. 23 shows how the inner element 1 is inserted into the lower hole of the handle 6 and permanently attached thereto. Furthermore, the outer tube 301 covers the throat at the bottom of the handle 6 and is permanently attached to it. The outer element can run between tubes 1 and 301 when the lock is released. This release is adjusted by the operating member 5 via the rod-like action member 7.

  FIG. 24 shows the fully assembled locking member 4 in the locked position. In this assembly procedure, the compression spring 419 is inserted into an axial hole in the sleeve 414. The cylinder 413 and its wedge 14 are then inserted into the same hole according to the above description. Accordingly, the spring 419 is compressed.

  Next, the rod-like action member 7 can be inserted into the hole 418 of the sleeve 414 and the hole 429 of the cylinder 413 from above. A screw portion to which the nut 420 is fastened is attached to the lower portion of the action member 7. Therefore, the action member 7 is connected to the cylinder 413, and this cylinder can be influenced by an upward tensile force. Thereafter, the action member 7 and the lock member 4 are inserted from the end of the inner element 1 until the upper edge of the intermediate portion 428 hits the end of the inner element 1. The pole 417 of the sleeve 414 can then be secured in a suitable manner by using a press operation on the inner element 1.

  In the next stage, the outer element 3 is inserted onto the inner element 1 from above. The upper end of the outer element 3 is preferably provided with a collar that serves as a stop for the upper end of the intermediate portion 428 to prevent the outer element 3 from being pulled out of the locking member 4 when the lock is released. Can do.

  As a next step, the inner element 1 can be inserted into the intended lower opening of the handle 6 and secured thereto. Finally, the outer tube 301 can be inserted onto the outer element 3 from below and attached to the lower part of the handle 6. The function of the lock member 4 is as follows. A compression spring 419 is compressed between the upper end of the pole 417 of the sleeve 414 and the lower end of the cylinder 413. Accordingly, the cylinder 414 and its wedge 14 are pressed downward.

  The wedge 14 acts on the wedge surface 203 of the jaw 9. Due to the low friction of the wedge surface and the small wedge angle, a large exchange of spring force can be realized according to the above description with respect to FIGS. Since this exchange force acts tangentially on the outer periphery of the jaw 9, the additional exchange is realized by a spring force that is approximately π (circumferential ratio) times that of the inner cone of the jaw 9 having the same wedge angle. Is done. This means that the lock is very effective.

  Another advantage of the locking device is that the rubbery surface layer 12 forms a large surface that provides a large frictional force. A surface that absorbs large forces also means that the compression of the surface layer 12 is negligible, thus providing a rigid lock with a small adjustment length. In other words, the locking force is increased from zero to a maximum value by a mere small axial movement of the wedge 14.

  The relatively high locking force mainly creates a pressure tension in the jaws 9. The jaw 9 is hardly subjected to a load having a bending tension. Therefore, even if these jaws 9 are made of a thermoplastic material, it is possible to determine the dimensions of the jaws 9 so that they can withstand long-term loads without providing a function to reduce plastic deformation. .

  Figures 25 and 26 show the essential components of the shaft in the released position. The operating member 5 is pressed against the handle 6 in the direction of arrow J by the operator. As a result, the arm 410 pivots upward, so that the hook-shaped portion 411 of the rod-like action member 7 is pulled upward. At that time, the hook-shaped portion 411 is fitted in the hole of the arm 410 so as to be rotatable. While the operating member 5 is thus rotated, the extension 303 is curved and thus functions as a hinge. If this extension is made of a suitable material such as polypropylene with the correct dimensions, there is no risk of fatigue failure.

  Alternatively, the operating member 5 can be pivotally attached to the handle 6 in other ways. Thus, since the action member 7 is pulled upward, the cylinder 413 and the wedge 14 are also pulled with it. Thus, the jaws 9 are pressed against each other under the influence of self tension in the plastic material. If equipped with an annular spring element 11, this can also contribute to pressing the jaws 9 against each other. This releases the surface layer 12 of the jaw 9 from the inner mantle surface of the outer element 3, so that the outer element 3 can move axially to the desired position. Thereafter, the operator releases the operation member 5, and the jaw 9 returns and engages with the outer element 3.

  Figures 27, 28 and 29 show the key components of an alternative embodiment of the locking member. This embodiment preferably includes a sleeve 414 made of injection molded acetal plastic having an upper tube portion 422 for insertion into and attachment to the inner element 1. In addition, the sleeve 414 includes a tubular intermediate portion 428 having a mantle surface for acting as a guide surface for the surrounding outer element 3. The lower portion of the sleeve 414 includes a tube 421 having an outer mantle surface that includes a riser in the form of a wedge 14. A through groove 423 is disposed across the tube 421.

  The locking member further includes a tubular jaw 9 divided by an axial wedge-shaped groove 13. This groove forms a wedge surface 203 on the opposing surface of the jaw 9. The outer mantle surface of the jaw 9 includes a surface layer of a suitable friction material as described above. In this embodiment, the surface layer 12 can extend around the entire outer periphery of the jaw 9 except the groove 13. The jaws 9 are suitably made of polyamide, possibly reinforced with glass fibers and injection molded. When the jaw is not affected by external force, the outer diameter of the surface layer 12 is smaller than the inner diameter of the outer element 3. At that time, the inner diameter of the jaw 9 is slightly larger than the outer diameter of the tube 421. Therefore, the jaw 9 can slide freely on the tube 421, so that the tube 421 functions as a guide for the jaw 9, so that the surface layer 12 of the jaw 9 and the inner mantle surface of the outer element 3 are in contact. I can't.

  FIG. 30 shows a pull pole 424 having an upper loop 426 and a lower transverse beam 425, suitably made of injection molded plastic.

  FIG. 31 shows the locking member 4 with a jaw 9 attached to the lower tube portion 421 of the sleeve 414 and with the wedge 14 fitted within the wedge-shaped groove 13. The pull pole 424 is inserted through the opening of the tube 421 and oriented such that the beam 425 runs in the groove 423. Thus, the loop 426 can be pulled upward, thereby causing the beam 425 to pull the jaw 9 upward toward the wedge 14. At that time, Joe 9 is unfolded.

FIG. 32 shows a shaft portion comprising a locking member according to the above description. The upper tube portion 422 of the sleeve 414 is inserted into and attached to the inner element 1. The inner element 1 is attached to the handle 6 according to the previous description.
The outer element 3 is placed outside the locking member 4 and the inner element 1 according to the previous description. For ease of understanding, the outer tube is not shown in FIGS. A hook 412 that is inserted into the loop 426 of the tension pole 424 is provided at the lower end of the action member 7. The upper part of the action member 7 includes an upper hook 411 which is inserted into the intended hole of the arm 410 of the operating member 5 in the same manner as described above.

  The operation member 5 is attached to the handle 6 so as to be rotatable around the rotation point Q by a known method. The lower end portion of the tension spring 427 is hooked on the hook 411. The upper end of the tension spring 427 is attached to the handle 6 in an appropriate manner. The tension spring 427 is pretensioned with an appropriate force and thus pulls the working member 7 upward. Thereby, the pull pole 424 pulls the jaw 9 upward against the wedge 14, so that the jaw 9 locks the outer element 3 against the inner element 1. When the outer element 3 is affected by the force in the direction of the arrow M, the jaws are pressed more strongly against the wedge 14. As a result, the lock portion is self-locking which is advantageous for a certain application against the force in the direction of the arrow M. When a force in the direction opposite to the direction of the arrow M is applied to the outer element 3, the lock portion is released when this force replaces the pretension of the tension spring 427.

  When the lock portion is released, the operation member 5 is pressed in the direction of the arrow J according to FIG. The action member 7, the tension pole 424 and the jaw 9 are released from the load of the spring force. Next, the self-tension in the jaw 9 affects the jaw 9 to recover the diameter when no load is applied. Accordingly, the jaw 9 concentrates around the lower tube portion 421 of the sleeve 414 and releases contact with the outer element 3. Thus, the position of the outer element 3 can be adjusted in the direction of the arrow M in a desired manner.

  The above-described embodiments of the present invention can be applied to various uses where a function capable of telescopic adjustment between two elements is desirable. Application examples include cleaning shafts, sports equipment, paint shafts, boat hooks, gardening tools and the like.

Another embodiment of a locking member that self-locks is shown in FIGS.
Figures 34-36 show an important part of an alternative embodiment of the locking member. This embodiment includes a sleeve 414 having an upper tube portion 422 that is preferably made of injection molded acetal plastic and is adapted to be inserted into and attached to the inner element 1. The sleeve 414 further includes a tubular intermediate portion 428 having a mantle surface adapted to serve as a guide surface for the surrounding outer surface 3.

  The lower portion of the sleeve 414 includes a tube 421 having an outer mantle surface that includes a riser in the form of a wedge 14. A lower sleeve 430 can be attached to the lower portion of the tube 421. The sleeve 430 is preferably made of injection molded acetal plastic and includes a tube portion having an inner mantle surface 431 that can slide with some play against the outer mantle surface of the tube 421. .

  The sleeve 430 further includes a wedge portion 14. The locking member further comprises a tubular jaw 9 according to FIG. 36 divided along the axial groove 13. Both ends of the groove 13 are wedge-shaped, and four wedge surfaces 203 are formed on the surface of the opposing jaw 9. 27, it is not necessary to equip the outer mantle surface 433 of the jaw with a special surface layer. The jaws 9 can be made of the same material, such as injection molded polyamide, which can be reinforced with glass fibers in some cases.

  Since the jaw 9 is not affected by the external force, the outer diameter of the mantle surface 433 is smaller than the inner diameter of the outer element 3. At that time, the inner diameter of the jaw 9 is slightly larger than the outer diameter of the tube 421. Therefore, the jaw 9 can slide freely on the tube 421, so that the tube 421 functions to guide the jaw 9, so that the mantle surface 433 of the jaw 9 and the inner mantle surface of the outer element 3 do not contact. .

  FIGS. 34 and 35 also show a pull rod 424 inserted from the sleeve 414 to the lower hole of the sleeve 430. The lower portion of the pull rod 424 is threaded, and a threaded nut 432 can be attached to this portion.

  37 and 38 show that the mounted locking member 4 and jaw 9 are placed over the lower tube portion 421 of the sleeve 414 and the upper edge 14 is engaged to engage the upper wedge-shaped groove 13. Indicates the state. Thereafter, the lower sleeve 430 is attached so as to cover the tube 421 and the lower wedge 14 is fitted to engage with the lower wedge-shaped groove of the jaw 9. The pull rod 424 is attached according to the above description.

  The device according to FIG. 37 is in the locked position. This position is achieved by pulling the pull rod 424 upward relative to the sleeve 414. This pulling operation is performed under the influence of the spring as described above. In this way, the lower sleeve 430 is pulled upward toward the sleeve 414. Therefore, the wedge 14 is pushed into the wedge-shaped groove 13 of the jaw 9, and as a result, the outer diameter of the jaw 9 increases. The outer mantle surface 433 on the jaw 9 then contacts the inner mantle surface of the outer element 3. In this way, the jaw 9 locks the outer element 3 against the sleeve 414.

The tube portion 422 of the sleeve is adapted to be fixed to the inner tube 1 according to the above description. Only a relatively small force is required to spread the jaw 9 in contact with the inner mantle surface of the outer element 3. When the outer element 3 receives a force in the direction of the arrow N with respect to the sleeve 414, the jaw 9 is pressed more strongly against the upper wedge 14. At that time, the jaws 9 tend to be further expanded, resulting in a stronger lock.
This also occurs when the coefficient of friction between the jaw mantle surface 433 and the inner mantle surface of the outer tube 3 is the same as the coefficient of friction between the wedge surfaces 203 and 204 of the respective wedges of the jaw 9. This is because the wedge 14 moves tangentially around the jaws. This therefore results in an exchange between tangential motion and radial motion multiplied by π (circumferential ratio) according to the previous explanation. This means that it is easy to obtain a self-locking lock between the jaw 9 and the outer tube 3 at a wedge angle large enough to prevent the self-locking of the wedge 14 within the wedge-shaped groove 13. This leads to a very advantageous combination of the features of the locking member 4.

This lock has a few simple components and can be engaged with less force but does not require any special friction material. While receiving an external force, the locking force increases as necessary and returns to a low engagement force after the load is reduced. In this way, it is not necessary to load the component continuously with great force, which is particularly advantageous when thermoplastic materials are used for the included component.
When the outer element 3 receives a force in the direction of the arrow O with respect to the wedge 414, the jaw 9 is pressed more strongly against the lower wedge 14. Joe then has a tendency to expand further, resulting in a stronger lock.

  The outer element 3 is then pulled along the lower sleeve 430 to the extent allowed by the tension rod, which can be the maximum compression of the compression spring. This means that the locking member 4 self-locks with respect to the movement in the direction of the arrow O except for some play. The amount of play depends on the degree of freedom of movement of the lower sleeve 430 in the axial direction. When a sufficiently large engagement force is used, the locking member 4 can also self-lock against rotation. This is because when the outer element 3 rotates with respect to the lock member 4, the jaws tend to be widened, increasing the lock force.

  FIG. 38 shows the locking member in the released position. This position is provided by moving the pull rod 424 in the direction of arrow K. Next, the self-tension in the jaw 9 acts on the jaw 9 to return to its unloaded diameter. Thanks to the relatively large wedge angle, the jaws can be easily pushed out of the wedge 14 with the help of self-tension in the material. The jaw 9 then concentrates around the lower tube portion 421 of the sleeve 414. The position of the outer element 3 can be adjusted in the direction of the arrow M in a desired way. The release clearly requires that the locking member 4 is initially free of loads from external forces and is therefore not in the self-locking position.

  39 and 40 show an alternative embodiment of the jaw 9. As described above, the jaw 9 has a cylindrical shape and is divided along an axial groove. An outward facing lip 402 is disposed on each surface of the groove. The lip 402 includes a pair of wedge surfaces 204 directed outward from one another. The jaws 9 can be made of the same material, such as injection molded polyamide, which can be reinforced with glass fibers in some cases. When the jaw 9 is not subjected to an external force, the inner diameter of the inner mantle surface 434 is slightly larger than the outer diameter of the inner element 1. In the unloaded condition, the outer mantle surface of the jaw 9 fits into the corresponding space in the lower sleeve 435 and the upper sleeve 437.

  These sleeves can be shaped according to FIGS. These sleeves 435 and 437 include facing wedge surfaces 203 that can cooperate with the wedge surface 204 of the jaw 9 so that the jaw 9 contracts when they press against each other. The lock 436 can be attached to the sleeve 435 through a through hole for the outer element 3. This lock acts as a support for the compression spring.

  FIG. 43 (left) shows the mounted locking device when the upper sleeve 437 is securely attached to the outer element 3 and the jaws are engaged in the space in the upper sleeve 437. In this way, the wedge surfaces 204 facing outwardly in pairs with the clamping jaws 9 cooperate with the corresponding wedge surfaces 203 of the upper sleeve 437. The lower sleeve 435, which is attached in the same manner as described above from below, has its wedge surfaces 203 and 204 cooperate with each other. Further, the compression spring is attached in a contracted state between the lid 436 and the upper sleeve 437.

  Under the influence of the spring force, the sleeves are urged together and the wedge surface 203 cooperates with the wedge surface 204 of the jaw 9. As a result, the jaw 9 contracts and the inner mantle surface 434 comes into contact with the outer mantle surface of the inner element 1. In this manner, the self-locking function for the operation of the inner element 1 in the directions of the arrows N and O with respect to the outer element 3 is realized in the same manner as described above with reference to FIGS.

  The right side of FIG. 43 shows how the locking device is released by pushing the sleeve 435 in the direction of arrow K. In this way, a space is formed for the jaws 9 that can be slid out of the wedge grooves in the respective sleeves under the influence of self-tension in the material, so that the jaws 9 are unfolded and the inner element 1 To break the contact. Therefore, the inner element 1 can move freely in the direction of the arrow M. This device provides a self-locking locking feature that engages the outer mantle surface, which may be advantageous in certain situations.

  Because this type of locking device can self-lock, it is possible to achieve a functional lock with a spring that exerts a very small engagement force that can operate the locking device without using force. is there. This can be accomplished using the apparatus shown in FIG. The upper part of the handle 6 has the shape of a ball with an upper opening for the operating member 5. The lower part of the handle 6 includes a throat 446. The inner element 1 and the outer tube 301 are attached and fixed to the throat by an appropriate method. The upper part of the operation member 5 has a push button shape, and is connected to the lower end part of the operation member 5 so as not to be detached from the upper part of the action member 7. As shown in FIG. 45, when released, the operator's grip (using the operator's hand) under the handle 6 and preferably the thumb are used to move the pressing surface of the operating member 5 in the direction of the arrow K below. Push in the direction. As a result, the action member 7 is also pushed in the direction of the downward arrow K, and the lock is released as described in detail above. The operating force can be maintained at a low force of about 20-30N. This means that the operation member 5 can be easily operated by appropriately designing the grip surface of the handle 6. The advantage of the tool shaft shown in FIGS. 44 and 45 is that it has fewer parts and is easily assembled. This means that weight and manufacturing costs are low.

  The present invention will be described in more detail with reference to the accompanying drawings, which are intended to illustrate the present invention and not to limit the present invention.

FIG. 6 is a shortened side view showing a shaft of a tool having a device according to the invention. It is a side view which mainly shows a locking member. It is a side view which shows the detail of a lock release apparatus. 2 is a partial cross-sectional side view showing the upper part of the device according to FIG. 1 in a locked position; FIG. Fig. 2 is a partial cross-sectional side view showing the lower part of the device according to Fig. 1 in a locked position. 2 shows a partial cross-sectional side view of the upper part of the device according to FIG. 1 in a release position. FIG. 2 is a partial cross-sectional side view showing the lower part of the device according to FIG. 1 in a release position; FIG. It is a side view of the apparatus provided with the tension operation member in a closed position. FIG. 9 shows the device according to FIG. 8 in an open position. It is the side view (upper figure) which mainly shows a locking member, and sectional drawing (lower figure) of the direction of the arrow A of the figure. It is a side view which shows a wedge, an action member, and an operation member. FIG. 12 is a view of the components according to FIG. 11 from below according to European view positioning. FIG. 12 is a partial cross-sectional side view of the locking member according to FIG. 10 and the device according to FIG. FIG. 14 shows the device according to FIG. 13 in a release position. FIG. 6 is a partial cross-sectional side view showing a locking member attached to an outer element with a positively locked inner element, with the wedge having another shape. FIG. 14 is a view of the device according to FIG. 13 except that the wedge is oriented in the opposite direction. It is a side view (middle figure) which shows the shaft of the vacuum cleaner which has a curved pipe, a hose, and the locking device by this invention, and its partial cross section enlarged view (right figure). A lower left figure is a partial side view which shows the lower part of the shaft of the vacuum cleaner with which the nozzle of the vacuum cleaner was attached. It is a side view by the apparatus of the figure in FIG. 17, and is a figure which shows alternative embodiment of an action member and an operation member. It is a fragmentary sectional view of the upper part of the shaft which can be adjusted telescopically. FIG. 20 is a partial sectional view of the lower part of the shaft according to FIG. 19. It is a partial cross section side view of a wedge apparatus. FIG. 2 is a partial cross-sectional side view (upper view) showing a sleeve including a clamping jaw, and a cross-sectional view (lower view) along the cross-sectional line AA of the sleeve according to the same drawing (the drawing standard conforms to the European view position) ing.). FIG. 20 is an enlarged partial view of the upper part according to FIG. 19. FIG. 21 is an enlarged partial view of the lower part according to FIG. 20. 24 is a top view according to FIG. 23 in a release position. FIG. FIG. 25 is a bottom view according to FIG. 24 in a release position. FIG. 2 is a partial sectional side view (upper view) showing a clamping jaw, and a top view (lower view) of the same figure (view position conforms to European drawing standards). FIG. 6 shows a sleeve with an integrated wedge, with a pure position according to the European drawing standard. FIG. 6 shows a sleeve with an integrated wedge, the view position according to the European drawing standard. FIG. 6 shows a tension bar whose view position conforms to the European drawing standard. FIG. 29 is a side view of the sleeve according to FIG. 28 with the clamping jaws and tension bar according to FIGS. 27 (upper) and 30 (right) attached. FIG. 32 is a side sectional view showing a shortened shaft with the locking device according to FIG. 31 in the locked position. FIG. 33 is a cross-sectional side view of the device according to FIG. 32 in a release position. FIG. 4 is a partial cross-sectional front view showing a lower sleeve attached to an upper sleeve with a pull rod. FIG. 35 is a side view of the device according to FIG. 34 in a view position according to the European drawing standard. FIG. 2 is a side view (upper view) showing a clamping jaw and a cross-sectional view (lower view) along the cross-sectional line AA (view position conforms to European drawing standards). FIG. 37 is a front view of the device according to FIG. 32 with the clamping jaws according to FIG. 36 attached, inserted into the open tube and in the locked position. Fig. 38 shows the device according to Fig. 37 in a release position. FIG. 6 is a front view of a clamping jaw with wedge surfaces directed outward from one another. FIG. 40 is a side view and top view of the clamping jaw according to FIG. 39 in a pure position according to the European drawing standard. FIG. 2 is a side sectional view of a lower sleeve of the lock and a sectional view taken along a sectional line AA (the view position conforms to the European drawing standard). FIG. 4 is a side sectional view of the upper sleeve of the lock and a sectional view taken along the section line AA (the view position conforms to the European drawing standard). FIG. 4 is a partial cross-sectional side view of the locking device in a locked position and a partial cross-sectional side view of the locking device in a released position. FIG. 6 is a partial cross-sectional side view of the tool shaft of the locking device in the locked position. 45 is a partial cross-sectional side view of the tool shaft according to FIG. 44 in a released position. FIG.

Explanation of symbols

1 Inner element, Inner tube 2 Connection hole 3 Outer element 4 Locking member 5 Operating member, Pulling flange 6 Handle 7 Action member 9 Jaw 10 Attachment collar 11 Spring element 12 Surface layer 13 Wedge-shaped groove 14 Wedge 19 groove, Track 26 through-hole 61 flange 70 rotatable peg 71 protective housing 73 extension 203, 204 wedge surface 301 outer plastic tube 302 inner metal tube 303 extension 304 protrusion, raised portion 305 space 306 opening, hole 307 engagement peg 308 opening Hole 309 groove 310 groove 400 guide groove 401 shelf 402 lip 403 conical portion 404 extension 405 nozzle 406 bent tube 407 hose 408 seal 410 arm 411, 412 hook 413 cylinder 414 sleeve 415 neck 416 track 417 pole 418 through hole 419 compression spring 420 421 Lower tube portion 422 Upper tube portion 423 Through groove 424 Tension rod, Tension pole 425 Beam 426 Loop 427 Tension spring 428 Middle portion 429 Through hole 430 Sleeve 431 Mantle surface 432 Nut 433 Mantle surface 435 Sleeve 436 Lock, Lid 437 Sleeve 446 Throat

Claims (5)

  A locking device comprising an inner element (1) and outer elements (3), (302), the inner element (1) moving axially relative to the outer element (3) like a tool shaft A locking member (4) for locking the inner element (1) and the outer elements (3), (302) to each other at one end of the outer elements (3), (302); The lock member (4) can be moved along an axis parallel to the longitudinal axis of the outer element, or the action member (301) can be rotated about the axis, thereby the lock member (4). Can be operated by a revolving member (5) that is spaced apart from the outer elements (3), (302) in the direction of the other end, the upper part of the operating member has the shape of a push button, , Completely or partially surrounding the outer element (302) Locking device characterized by having a (301).   Locking member according to claim 1, characterized in that the tube (301) is made of a polymeric material.   Locking member according to claim 1 or 2, characterized in that the outer element comprises a thin metal tube (302), preferably of hardened aluminum.   The locking member according to claim 3, characterized in that no surface treatment of the outer element (302) is required.   5. The operating member (5) according to any one of claims 1 to 4, characterized in that it has a bendable extension (303) with an outer end (304) attached to the working member (301). The lock member as described in 2.

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