JP2000266262A - Telescopic extension tube and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic extension pipe with lock structure having a small pressure loss and a vacuum cleaner using this telescopic extension pipe. SOLUTION: This pipe comprises an inner pipe 12 slide movable in an outer pipe 6, an expansion part 9 provided in an end part of the outer pipe 6 to have an annular space 18, an operation body 11 displaceable in a direction orthogonal to an axial direction of the outer pipe 6, a pressure contact body 25 arranged in the annular space 18 also provided with an internal diameter smaller than external shape dimension of the inner pipe, an engaging part provided in the pressure contact body 25, and an engaged part provided in the operation body 11. When the operation body 11 is pressed to the inward, the engaged part is brought into contact with the engaging part, to be press broadened, so as to unlock a friction part 26 and an external periphery of the inner pipe 12 by displacing a side part of the pressure contact body 25 to the outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic extension tube which comprises an outer tube and an inner tube which slides inside the tube, and which can be expanded and contracted to a desired length and which can be locked at any position, and an electric tube using the same. It is related to a vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, this type of extendable extension tube is generally described in Japanese Patent Application Laid-Open No. 5-184501. This will be described below with reference to FIGS. The telescopic extension tube 100 is an outer tube 10 made of a metal pipe.
1 and an inner tube 104 made of a metal pipe which slides inside thereof and has a row of locking concave portions 102 of a predetermined shape at appropriate intervals on the upper side and a detent groove 103 on the lower side. .

[0003] At the tip of the outer tube 101, a detent groove 10 is provided.
Guide body 10 integrally formed with convex portion 105 to be fitted with 3
6 fixed, and the locking body 1 supported by the guide body 106
07 and a restraining body 109 urged by a spring body 108 in a direction of pushing the locking body 107 into one of the locking recesses 102.
And an operation button 110 for operating the restraining body 109 against the spring body 108.

A large-diameter portion 111 is formed at the front end of the inner tube 104 to be fitted with a floor nozzle (not shown), and a packing 112 made of synthetic resin is slidably in contact with the inner periphery of the outer tube 101 at the rear end.
Is fixed. Further, a small diameter portion 113 is formed at the rear end of the outer tube 101 so as to fit with a not-shown hand portion.

[0005] In the above configuration, usually, the restraining body 109
11 is urged by a spring body 108 in a direction indicated by an arrow A in FIG. 11 so that the locking body 107 is pushed into the locking recess 102, and the axial movement of the inner pipe 104 is fixed to the outer pipe 101. I have.

Next, when the inner tube 104 is pulled out or pushed in from the outer tube 101, the operating member 110 is pushed in the direction of arrow B in FIG. The inner tube 104 was displaced in a direction of releasing from the restraint on the locking concave portion 102, and the inner tube 104 was slidable with respect to the outer tube 101.

[0007] A small-diameter portion 113 is tapered into a hose hand portion (not shown).

[0008]

In the conventional configuration, a row of locking recesses is provided in the inner tube, which requires a complicated mold processing. In addition, by providing a recess, that is, a portion protruding inward, This has been an obstacle to increasing the pressure loss to reduce the cross-sectional area of the passage and improving the suction performance.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pressing member provided with a friction portion for pressing the outer periphery of an inner tube in a radial direction by an operating body to lock and release. The cross section of the inner tube may remain circular, and does not increase the pressure loss.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
An outer tube, an inner tube that freely slides in the outer tube, an expansion portion provided at an end of the outer tube and having an annular space, and an operation that can be displaced in a direction orthogonal to an axial direction of the outer tube. A pressure contact body disposed in the annular space and having an inner diameter smaller than an outer dimension of the inner tube; a friction portion provided on an inner peripheral surface of the pressure contact body; Since the engagement portion and the engagement portion that engages with the engaged portion and displaces the side portion of the press-contact body outward when the operation body is pressed inward are provided on the press-contact body, The pressure contact of the friction portion can be released by pressing the operating member against the pressure contact member locked by the frictional force, and there is no need to provide a locking recess in the inner tube, so that pressure loss does not increase.

[0011] The invention according to claim 2 of the present invention comprises an outer tube,
An inner pipe that freely slides in the outer pipe, guide bodies A and B provided at ends of the outer pipe, and an annular space formed between the two guide bodies A and B in an annular shape An operating body that is displaceable in a direction perpendicular to the axial direction of the outer tube, an annular elastic piece disposed in the annular space and connected to the operating body, and opposing inner walls on both sides of the elastic piece. And a pair of friction portions provided as described above, and the dimension between the inner ends of the friction portions when the operating body is not operated is set smaller than the outer diameter dimension of the inner tube. The pipe does not require a recess for locking, and the number of parts can be reduced by connecting the operating body and the annular elastic piece.

[0012] The invention according to claim 3 of the present invention provides an outer tube,
An inner pipe that slides freely in the outer pipe, an operating body that is displaceable in a direction perpendicular to the axial direction of the outer pipe, and an axial body that is displaced in the axial direction in response to an inward operation of the operating body and A ring having an inclined surface in the direction, an annular airtight packing for maintaining the airtightness between the outer pipe and the inner pipe, and a pressure contact portion for pressing the outer circumference of the inner pipe on an inner peripheral wall of the airtight packing. When the ring is displaced to the air tight packing side by the operation of the operating body, the press contact portion is expanded outward at the press contact portion on the inclined surface, so that a concave portion for locking is provided in the inner pipe. It is not necessary, and the number of parts can be reduced by using the sealing gasket and the friction portion together.

According to a fourth aspect of the present invention, there is provided a main body having a built-in electric blower and a dust collecting chamber for collecting dust; a hose having one end connected to the dust collecting chamber; A suction device connected to the other end of the hose via the telescopic extension tube described in any one of the above items, and the length of the extension tube according to the cleaning place and the height of the user during cleaning Can be easily adjusted, and the storage space can be saved by minimizing the length of the extension tube during storage.

[0014]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described.
This will be described with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a telescopic extension tube;
2 is a main body of the vacuum cleaner, 3 is a hose having a hand portion 4 connected to the main body 2, and 5 is a floor nozzle. And 6
Is an outer tube made of a synthetic resin material.
And a buckle engaging part (not shown) are integrally formed, and an extension part 9 having an opening 8 formed on the top surface is provided on the distal end side, and a cover body 10 covering the opening 8 is provided. And an operation body 11 for manually displacing between them.

Reference numeral 12 denotes an inner tube which slides in the outer tube 6 in the axial direction to change the total length of the telescopic extension tube 1. The inner tube 12 is made of a pipe-like resin or metal. A connection portion 14 for fitting and connecting is provided.

Then, as shown in FIG.
A stopper 15, a packing 16, and a guide body 17 are attached to and inserted into the inner tube 12 in order from the back side. The guide body 17 forms an annular space 18 between itself and the inner wall of the expansion section 9, and is positioned and fixed to the outer tube 6 by a rotation preventing section and a retaining section (not shown). The guide body 17 constitutes a bearing for slidably holding the inner tube 12, and the packing 16 maintains airtightness between the outer peripheral surface of the inner tube 12 and the inner peripheral surface of the expansion portion 9. The stopper 15 is configured to prevent the inner tube 12 from coming off the outer tube 6 between the stopper 15 and the convex portion 19.

The operating body 11 provided with the operating portion 20 is urged by a spring 23 with a rotating shaft 22 held between the cover body 10 and a shaft supporting portion 21 formed on the upper surface of the guide body 17. The inner tube 12 is rotatable in a direction perpendicular to the axis.

Further, as shown in FIGS. 4 and 5, a pressure contact body 25 made of a leaf spring which can be displaced in the radial direction around the fulcrum 24 is placed in the annular space 18, and the inner peripheral surface of the pressure contact body 25 has a felt. A friction portion 26 made of, for example, an adhesive is fixed to the outer periphery of the inner tube 12 through a cutout hole 27 provided on a side surface of the guide body 17. The engaging portion 2 having an inclined surface is located at a position opposite to the engaged portion 28 formed at the lower end of the operation portion 20.
9 are provided. The inner diameter of the press-contact body 25 is smaller than the outer diameter of the inner tube 12 in a natural state, and the inner tube 12 is locked to the outer tube 6 in a normal state as shown in FIG.

The operation of the above configuration is as follows.

As shown in FIG. 5, when the user displaces the operation portion 20 of the operation body 11 downward, the engagement portion 29 of the press-contact body 25 disposed in the annular space 18 of the expansion portion 9 is locked. Part 28
As a result, the friction portion 26 is separated from the outer periphery of the inner tube 12, whereby the locked state between the inner tube 12 and the friction portion 26 is released, and the inner tube 12 is free with respect to the outer tube 6. Sliding displacement is enabled.

At this time, since the engaging portion 29 forms an inclined surface, the pressing member 25 can be spread by a small force due to the wedge force. That is, since the holding force can be held and released by operating the contact of the friction portion 26, there is no need to provide a concave portion, that is, a portion protruding inward in the inner tube 12 for locking. The complicated processing can be omitted, and the pressure loss does not increase because the sectional area of the passage is not reduced.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The operation unit 20 and the fulcrum 2 provided between the guide body A30 and the guide body B31 at positions facing each other.
4 and an annular elastic piece 33 connecting the fulcrum 24 and the operation unit 20.
An operating body 11 provided with a friction portion 26 set to a size smaller than the outer diameter of No. 2 is provided.

The operation of the above configuration is as follows.

As shown in FIG. 8, due to the pressing force of the operation portion 20 and the reaction force at the fulcrum 24, the annular elastic piece 33 is pushed outward in an elliptical shape, and the friction portion 26 is separated from the outer periphery of the inner tube 12. , The inner tube 12 can slide freely. Further, the elastic piece 33 always returns to the position shown in FIG. 7 due to the restoring force, and a locking force is obtained between the friction portion 26 and the inner tube 12. That is, it is not necessary to provide a locking recess in the inner tube 12, and at the same time, since the elastic piece 33 and the operating body 11 are integrally formed, the number of parts can be reduced. Further, the annular space 18 between the guide body A30 and the guide body B31
Since the elastic piece 33 is disposed on the outside, it is not necessary to increase the outer diameter of the extension portion 9 and the size can be reduced.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

The packing 16 has a press-contact portion A34 which presses against the inner wall of the expansion portion 9, and the inner pipe 1 in the axial direction from the press-contact portion A34.
A press-contact portion B having an inner diameter that presses against the outer periphery of the inner tube 12 on the second side
35 is formed in a substantially L-shaped cross section. Pressing part B3
Reference numeral 5 denotes a pressure-contact state with the inner pipe 12, and in a normal state, the inner pipe 12 provides a retaining force to be locked. In particular, the packing 16 is displaced in the inner circumferential direction in the direction in which the inner pipe 12 is pushed in, so that the packing 16 is in the biting direction, and a large holding force is generated. The holding force is smaller in the direction in which the inner tube 12 is pulled out than in the case where it is pushed in. Reference numeral 36 denotes an inclined surface 3 which is slidably disposed on the outer periphery of the inner tube 12 on the operation body 11 side and abuts against the pressure contact portion B35.
7 is a ring provided. An engagement portion 39 is formed on the ring 36 so as to face an action portion 38 that is provided to be inclined below the operating body 11.

The operation of the above configuration is as follows.

When the operation section 20 of the operation body 11 is pressed, the action section 3
8 displaces the ring 36 in the direction of the press contact portion B35 by the engaging portion 39. As a result, the inner diameter of the press-contact portion B35 is expanded and the inner tube 12 can be freely slid. That is, it is not necessary to provide a locking recess in the inner tube 12, and at the same time, the number of components can be reduced by using the airtight packing 16 as a friction portion for locking the inner tube 12.

[0031]

According to the first aspect of the present invention,
An inner pipe that freely slides in the outer pipe, an expansion section provided at an end of the outer pipe and having an annular space, an operating body that is displaceable in a direction orthogonal to an axial direction of the outer pipe, A pressure contact body disposed in a space and having an inner diameter smaller than an outer dimension of the inner tube; a friction portion provided on an inner peripheral surface of the pressure contact body; an engaged portion provided on the operation body; When the operating body is pushed inward, the engaging portion that engages with the engaged portion and displaces the side portion of the press-contact body outward is provided on the press-contact body, so that it is normally locked by frictional force. By pressing the operating body, the pressing body in the state can easily release the pressing of the friction part,
Moreover, since there is no need to provide a locking recess in the inner tube, it is possible to provide a telescopic extension tube that is easy to mold and has little pressure loss.

According to the second aspect of the present invention, the inner pipe slidably in the outer pipe, the guides A and B provided at the ends of the outer pipe, and the two guides. An annular space formed between the bodies A and B in an annular shape, an operating body displaceable in a direction orthogonal to the axial direction of the outer tube, and an annular space arranged in the annular space and connected to the operating body. An elastic piece, comprising a pair of friction portions provided so as to oppose the inner wall on both sides of the elastic piece, the size between the inner end of the friction portion when the operating body is not operated Since the outer diameter of the inner tube is set smaller than that of the inner tube, the operating body and the annular elastic piece are connected to each other, so that the number of parts is reduced, and there is no need to provide a locking recess in the inner tube. It is possible to provide a telescopic extension tube that is easy to mold and has little pressure loss.

According to the invention of claim 3 of the present invention, the inner pipe slidably slidably in the outer pipe, the operating body displaceable in a direction perpendicular to the axial direction of the outer pipe, A ring that is displaced in the axial direction in response to an inward operation and has an inclined surface in the circumferential direction, and an annular airtight packing that maintains airtightness between the outer pipe and the inner pipe; A pressure contact portion for pressing the outer periphery of the inner tube on the inner peripheral wall is provided, and when the ring is displaced to the air tight packing side by operation of the operating body, the pressure contact portion is extended outward by the pressure contact portion on the inclined surface. As a result, the airtight airtight packing and the friction portion can also be used, whereby the locking structure with the inner tube can be simplified and the cost can be reduced.

According to the fourth aspect of the present invention, a main body having a built-in electric blower and a dust collecting chamber for collecting dust, a hose having one end connected to the dust collecting chamber, and a first aspect of the present invention. ~
3. A suction device connected to the other end of the hose via the telescopic extension tube according to any one of the items 3, wherein the length of the extension tube is adjusted according to the cleaning place and the height of the user during cleaning. The length of the extension tube can be easily adjusted during storage, the length of the extension tube can be minimized to save storage space, and a vacuum cleaner with good suction performance can be provided by using an extension tube with less pressure loss.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a vacuum cleaner showing a first embodiment of the present invention.

FIG. 2 is an overall side view of a telescopic extension tube of the vacuum cleaner.

FIG. 3 is a sectional view of an essential part of the telescopic extension tube.

FIG. 4 is a sectional view taken along line aa of FIG. 3;

FIG. 5 is a sectional view taken along a line aa in FIG. 3 (in a state where an operation unit is pressed).

FIG. 6 is a sectional view of an essential part of a telescopic extension tube of a vacuum cleaner showing a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line bb of FIG. 7;

FIG. 8 is a cross-sectional view taken along line bb of FIG. 7 (when the operation unit is pressed).

FIG. 9 is a sectional view of a main part of a telescopic extension tube of a vacuum cleaner showing a third embodiment of the present invention.

FIG. 10 is an overall side view of a telescopic extension tube showing a conventional example.

FIG. 11 is an overall side view when the operation button of the telescopic extension tube is pressed.

FIG. 12 is a sectional view taken along line dd of FIG. 10;

[Explanation of symbols]

 Reference Signs List 6 outer tube 9 extended portion 11 operating body 12 inner tube 17 guide body 18 annular space portion 25 press-contact body 26 friction portion 28 engaged portion 29 engaging portion

Claims (4)

[Claims] 1. An outer tube, an inner tube slidably slidable within the outer tube, an extension provided at an end of the outer tube and having an annular space, and a direction orthogonal to an axial direction of the outer tube. An operating body that is displaceable in the annular space, a press-contact body having an inner diameter smaller than an outer dimension of the inner tube, a friction portion provided on an inner peripheral surface of the press-contact body, An engaged portion provided, and an engaging portion that engages with the engaged portion and displaces a side portion of the press-contact body outward when the operating body is pressed inward to the press-contact body. Telescopic extension tube provided. 2. An outer tube, an inner tube that slides freely in the outer tube, a guide body A and a guide body B provided at an end of the outer tube, and the two guide bodies A and B. An annular space formed between the annular space, an operating body that is displaceable in a direction orthogonal to the axial direction of the outer tube, an annular elastic piece disposed in the annular space and connected to the operating body, A pair of friction portions provided so as to face the inner walls on both sides of the piece, and when the operating body is not operated, the dimension between the inner ends of the friction portions is set to Telescopic extension tube set smaller than outer diameter. 3. An outer tube, an inner tube that slides freely in the outer tube, an operating body that is displaceable in a direction orthogonal to an axial direction of the outer tube, and an inward operation of the operating body. A ring provided with an inclined surface in the circumferential direction while being displaced in the axial direction, and an annular airtight packing for maintaining the airtightness between the outer pipe and the inner pipe, wherein the inner pipe is provided on an inner peripheral wall of the airtight packing. A pressure contact portion that presses the outer periphery of the cylinder, and when the ring is displaced toward the airtight packing by operation of the operating body, the extension / contraction extension is such that the pressure contact portion is extended outward at the pressure contact portion on the inclined surface. tube. 4. A main body having a built-in electric blower and a dust collecting chamber for collecting dust, a hose having one end connected to the dust collecting chamber, and a hose according to any one of claims 1 to 3. A vacuum cleaner having a suction tool connected to the other end of the hose via a telescopic extension tube.