JP2006130048A - Desk with lifting top plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desk with a lifting top plate, which can be operated to move up/down easily, is stable with the lightweight lifting section, does not need to use both gears of right screw type and left screw type and can be manufactured at low cost. <P>SOLUTION: A desk with a lifting top plate 10 has a lifting unit 11 and a base unit 21, and the lifting unit extends down from a top plate section 12 and the back surface of the top plate section and can go up and down integrally with the top plate section, has a lifting strut section 13 with a rack section 16 prolonged in the vertical orientation, the base unit is prepared corresponding to each lifting strut section, guides lifting movement of the lifting strut section through a worm gear section which gears with the rack section and has a guiding/holding leg section 22 which holds the lifting unit, a rotary synchronous shaft part 23 which is fixed to the guiding/holding leg section and has a worm section which gears with the worm gear section and a rotary means 31 of the rotary synchronous shaft part, all worm sections of the rotary synchronous shaft part comprise only a right screw type worm section or only a left screw type worm section and the worm section and the worm gear section are engaged so that the lifting movement of the lifting strut section may totally synchronize in an orientation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a top / bottom desk. The top / bottom desk according to the present invention can be fixed in a fixed state at a desired height by adjusting the height of the top section by continuously elevating the top section, and its elevating operation is simple Moreover, it can be manufactured at a low cost.

  Many children's learning desks are equipped with a means to move the top plate up and down freely and fix it. The height of the top plate can be adjusted according to the growth of the children used and the changes in the children used. Can be adjusted. Many of the top height adjustment means of the learning desk for children are provided with through-holes in both the lifting column connected to the top and the guide holding leg connected to the base. The height of the top plate is adjusted by screwing and fixing bolts and nuts into the through holes at the desired height. Such a top plate height adjusting means is excellent in that it is inexpensive. However, in the top plate height adjusting means, the through holes are provided discontinuously, and the height of the top plate depends on the position of the through holes, so that continuous height adjustment is impossible. In addition, when adjusting the height of the top plate, it is necessary to remove the bolts while lifting the top plate and the lifting column, and then fix the new plate through the bolts. It was difficult to adjust the thickness.

  On the other hand, a method using a hydraulic cylinder or an air cylinder is known as means for continuously raising and lowering the height of the table top and fixing it at any desired position. However, since the lifting device is large and expensive, it is only used in some high-end desks.

Various methods using gears have also been proposed as inexpensive means for continuously raising and lowering the height of the top plate and fixing it at any desired position.
For example, (a) a bracket having a substantially U-shaped cross section connected to the upper part of the base and extending in the vertical direction; and (b) lifting up and down provided on the inner periphery of the bracket to raise and lower the top plate. There is known a lifting device for a top plate provided with means (Patent Document 1). However, this lifting device has a very simple structure with only one leg, and can be applied only to lifting and lowering a relatively small desk. Moreover, there is no description about the mechanism which raises / lowers the top plate of a desk with two or more legs.

A mechanism has also been proposed in which the leg part moves up and down the top plate of the desk having two or more. For example, (a) a cylindrical guide leg serving as left and right support legs provided on the lower surface of the top plate part, and (b) the guide leg. (C) a screw shaft that is pivotally supported by the guide leg and is supported in the axial direction, and (d) a floor leg that is provided on the floor leg, (E) a driven bevel gear provided on the screw shaft; and (f) a drive bevel gear that meshes with the driven bevel gear, and an operating shaft connected to a rotation source. (G) A driving bevel gear that is attached to the operation shaft and meshes with the driven bevel gear, and (h) a top plate elevator including a support shaft member that can be attached to and detached from the top plate. (Patent Document 2). In this top board elevator, two screw shafts parallel to the vertical direction are rotatably held by two nut portions fixed to two floor legs, and the screw shafts are rotated by synchronized rotation of the screw shafts. The top plate connected to the shaft can be raised and lowered continuously.
However, in this top plate elevator, it is necessary to move the top plate in the same direction (that is, either upward or downward) by rotating the two screw shafts. It is necessary to reverse the direction of threading provided in That is, one is a right-hand thread type (a type in which a screw thread is provided so as to move away from the observer if it is traced clockwise when viewed in the axial direction), and the other is a left-hand thread type (in the axial direction) It is necessary to use a type in which a screw thread is provided so as to move away from the observer if it follows counterclockwise when viewed.
Further, in the above-described top plate elevator, the lift part including the top plate and the lift means for moving the lift part up and down are integrated, and the lift part including the top plate and the lift means can be lifted and lowered simultaneously. Therefore, there is a drawback that the weight of the entire lifting portion is increased, and a large force is required to move it up and down. Further, when the lifting means is rotated by, for example, a manual handle, the handle portion is also lifted and lowered at the same time. Furthermore, since the lifting means having a large weight is provided at a high position, the center of gravity of the desk becomes high, and in order to obtain the stability of the desk, it is necessary to increase the weight of the base more than necessary. .

In addition, a device that raises and lowers the article storage shelf in the vertical direction continuously by a gear mechanism including a combination of a rack, a worm wheel, and a worm gear along two columns is also known (Patent Document 3). In the gear mechanism used in this article storage shelf lifting device, as will be described later with reference to FIG. 7, if one of the worm gears provided on the left and right ends of the operating shaft is a right-hand thread type, the other is a left-hand thread type. There is a need to. The right-handed worm gear needs to be engaged using a right-handed worm wheel, and the left-handed worm gear needs to be engaged using a left-handed worm wheel. Furthermore, the rack that meshes with the right-hand thread type worm wheel is a right-hand thread type, and the rack that meshes with the left-hand thread-type worm wheel is a left-hand thread type. Therefore, since it is necessary to use a right-handed screw type and a left-handed screw type for each of the worm gear, the worm wheel, and the rack, the types of parts increase and the manufacturing cost increases.
In the lifting device for the article storage shelf, the lifting part including the article storage shelf and the lifting means for moving the lifting part up and down are integrated, and the lifting part including the article storage shelf and the lifting means are simultaneously provided. Since it is moved up and down, the entire weight of the lifted portion is increased, and there is a drawback that a large force is required to move up and down.

Japanese Utility Model Publication No. 7-17135 Japanese Patent Application Laid-Open No. 11-1113640 JP 2004-173959 A

  Therefore, an object of the present invention is a top plate elevating type desk capable of continuously and smoothly raising and lowering the height of the top plate of the desk and fixing it in a stable and stationary state at any desired position. It can be applied to a large desk having the above-mentioned legs, and the elevating part including the top plate and the elevating means for moving the elevating part up and down are not integrated, and the elevating means does not move up and down. Elevating operation is easy and stable because the elevating part is reduced in weight, and it is not necessary to use both right-handed and left-handed gears. An object of the present invention is to provide a top / bottom desk that can be manufactured at low cost using only one of the gears.

The above problems are solved by the present invention.
A top / bottom desk that includes a lift unit and a base unit,
(A) The lifting unit is
(1) a top plate portion; and (2) a rack portion that extends downward from the lower surface of the top plate portion, can be moved up and down integrally with the top plate portion, and extends in the vertical direction. Including two or more lifting columns,
(B) The base unit is
(1) Provided in correspondence with each of the above-mentioned lifting column parts, and slidably guide each lifting movement of the lifting column part via a worm wheel part meshing with the rack part, Guide holding legs that hold the lifting unit,
(2) a rotation synchronization shaft portion having a worm portion fixed to the guide holding leg portion and meshing with the worm wheel portion, and (3) a rotation means for rotating the rotation synchronization shaft portion,
All the worm parts provided in the rotation synchronization shaft part consist only of a right-handed worm part or only a left-handed worm part,
The worm part and the worm wheel part can be solved by a top-table elevating type desk, wherein the elevating movement of the elevating column part is engaged so as to synchronize in one direction as a whole.

In a preferred embodiment of the present invention, there are two lifting columns, two guide holding legs, and one rotation synchronization shaft.
In a further preferred aspect of the present invention, one of the worm parts provided at both ends of the rotation synchronization shaft part meshes with a worm wheel part provided above the worm part (i.e., The gears mesh with each other), and the other worm portion meshes with a worm wheel portion provided below the worm portion (that is, the gears mesh with each other).

  Furthermore, in a preferable aspect of the present invention, there are four elevating struts, four guide holding legs, three rotation synchronization shafts, and the first rotation synchronization shafts at both ends thereof. The second rotation synchronization shaft portion is coaxial with the worm wheel portion meshing with the worm portion provided at one end of the first rotation synchronization shaft portion, and the third rotation The synchronization shaft portion is coaxial with a worm wheel portion meshing with a worm portion provided at the other end portion of the first rotation synchronization shaft portion, and a pinion is provided at the other end portion of the second rotation synchronization shaft portion. A worm wheel portion having a pinion portion at the other end portion of the third rotation synchronization shaft portion and meshing with each of the worm portions at both ends of the first rotation synchronization shaft portion. Meshing with the rack part of the lifting column part and the rack part of the second lifting column part, The pinion portion provided at the end of the rotation synchronizing shaft portion meshes with the rack portion of the third lifting / lowering strut portion, and the pinion portion provided at the end portion of the third rotation synchronizing shaft portion is the rack of the fourth lifting / lowering support portion. Mesh with the part.

  In the present specification, the vertical relationship and the vertical direction mean a relationship and direction related to the direction of gravity unless otherwise specified, for example, terms such as upper, upper, or upper surface, or terms such as lower, lower, lower surface, or bottom surface. Is used. In this specification, the right / left relationship means the left / right relationship when observing the attached drawing from the front side to the back side of the page, unless otherwise specified. Or terms such as left or left direction.

  The top / bottom lift desk of the present invention can be lifted up and down continuously and smoothly, and can be stably and fixedly fixed at any desired position, and has two or more legs. It can be applied to a large desk having a section. In addition, the lifting unit including the top plate only includes the rack portion of the gear component, and the worm wheel portion and the worm portion are included in the base unit that does not move up and down. It is possible to reduce the weight and stabilize the entire desk. Further, even when the rotation synchronization shaft portion is rotated by a manual handle, the manual handle does not move up and down, and the rotation operation is easy. Furthermore, it is not necessary to use both right-handed and left-handed gears, and since it can be manufactured using only one of right-handed and left-handed gears, the number of parts used is reduced. The manufacturing cost is reduced.

Specific embodiments of the top-bottom desk according to the present invention will be described below with reference to the accompanying drawings.
1 and 2 show a top / bottom desk type desk 10 according to one embodiment of the present invention. FIG. 1 is a perspective view of a top / bottom desk 10 and FIG. 2 is an exploded perspective view thereof.
The top plate elevating desk 10 of the present invention comprises a vertically movable unit 11 and a base unit 21 placed on a floor surface, and the lift unit 11 includes a top plate 12 and a lift unit. It has column parts 13 and 13. Specifically, two lifting columns 13, 13 are connected to the top plate 12, and both end regions of the lower surface of the top plate 12 at the upper ends of the lifting columns 13, 13. It is linked to. For the connection, for example, auxiliary frames 14 and 14 can be used. The elevating struts 13 and 13 are provided to extend downward from the lower surface of the top plate 12 in parallel with each other. Further, each of the elevating support columns 13 has a substantially U-shaped cross section, and a rack portion 16 is provided on the inner wall surface 15 thereof. The rack part 16 has a screw thread that can move the elevating unit 11 in the vertical direction.

  The base unit 21 includes guide holding leg portions 22 and 22 and a rotation synchronization shaft portion 23. 1 and 2, the base unit 21 includes base parts 24 and 24 and a reinforcing part (for example, a penetrating part) 25 in order to stabilize the entire top / bottom desk 10. It is preferable. Further, when the base portion 24 is provided, a moving means (not shown) such as a caster can be provided on the bottom surface of the base portion 24, or when the base portion 24 is not provided, on the bottom surface of the guide holding leg portion 22.

  Each of the guide holding legs 22 and 22 is provided so as to extend upward in the vertical direction from the base 24, and has an opening 27 at the upper end, and a cavity continuous to the opening 27 is provided inside. Have. The elevating support column portions 13 and 13 of the elevating unit 11 are inserted into the hollow portions from the openings 27 and 27 of the guide holding leg portions 22 and 22, respectively, and the outer wall surfaces of the elevating support column portions 13 and 13 are inserted. The guide holding legs 22 and 22 are slid along the inner wall surfaces (that is, slidable) and can be moved up and down.

  Both ends of the rotation synchronizing shaft portion 23 are rotatably held on the side surfaces of the guide holding leg portions 22 and 22 by worm wheel cover portions 26 and 26. Furthermore, the base unit 21 includes a manual handle portion 31 and gears 34 and 35 provided in the gear cover portion 33 as rotating means for rotating the rotation synchronization shaft portion 23. The manual handle portion 31 is rotatably fixed to the side surface of the one guide holding leg portion 22 by a handle shaft bearing portion 32. Further, a gear 34 having the rotation shaft portion 36 as a rotation shaft is provided at the other end of the rotation shaft portion 36 of the manual handle portion 31, and a gear 35 meshing with the gear 34 is rotated. The synchronization shaft portion 23 is provided in the rotation synchronization shaft portion 23 with the rotation shaft as a rotation axis. Therefore, when the manual handle portion 31 is rotated, the rotational motion is transmitted to the rotation synchronization shaft portion 23 via the gears 34 and 35, and the rotation synchronization shaft portion 23 can be rotated. In FIG. 2, the gear cover 33 is omitted, and only the gears 34 and 35 provided therein are shown.

  Next, the structure of the gear mechanism that meshes with the rack portion 16 will be described with reference to FIGS. 3 and 4. FIG. 3 is a partial perspective view showing the structure of the worm wheel portion 41 meshing with the rack portion 16 and the structure of the worm portion 42 meshing with the worm wheel portion 41 together with the rotation synchronization shaft portion 23 and the manual handle portion 31. . FIG. 4 is a partially exploded perspective view for explaining that the worm wheel portion 41 and the rack portion 16 are engaged with each other. In practice, the worm wheel portion 41 and the rack portion 16 that are engaged with each other are connected. For convenience of explanation, they are shown separated from each other.

  At each of both ends of the rotation synchronization shaft portion 23, the worm wheel portion 41 and the worm portion 42 are rotatably fixed inside the worm wheel cover portion 26 in a state of being engaged with each other, and inside the guide holding leg portion 22. Since it is housed inside the cavity, it cannot be observed from the outside. FIG. 3 is a perspective view showing a state in which the guide holding leg portion 22 covering the worm wheel portion 41 and the worm portion 42 is removed. As described above, the worm portion 42 is provided at both ends of the rotation synchronization shaft portion 23. In other words, the rotation synchronization shaft portion 23 passes through the through-hole bearing portion 43 of the worm wheel cover portion 26, and both end portions thereof protrude inside the guide holding leg portion 22. Worm portions 42 and 42 are provided at the protruding end portions at both ends, respectively.

  The worm wheel portion 41 is rotatably provided on a projecting bearing portion 44 provided on the inner side of the worm wheel cover portion 26, and meshes with the worm portion 42. Furthermore, as shown in FIG. 4, the worm wheel portion 41 meshes with the rack portion 16 provided on the inner wall surface 15 of the lifting column 13. Therefore, as shown in FIG. 3, when the manual handle portion 31 is rotated, the rotational movement is engaged with the gear 34 provided at the other end of the fixed shaft of the manual handle portion 31 and the gear 34. The rotation synchronization shaft portion 23 is rotated by being transmitted to the rotation synchronization shaft portion 23 through a gear 35 provided on the rotation synchronization shaft portion 23. The worm portions 42 provided at both ends of the rotation synchronization shaft portion 23 rotate together with the rotation synchronization shaft portion 23, rotate the worm wheel portion 41 meshed with the worm portion 42, and the rack portion 16 meshed with the worm wheel portion 41. Can be moved up and down.

  Next, a mechanism in which the rotational movement of the manual handle 31 is converted into the vertical movement of the rack 16 in the top / bottom desk 10 of the present invention will be described with reference to FIG. In the following description, the right / left relationship is the right / left relationship for the sake of convenience when observing FIG. 5 from the front side to the back side of the drawing, and the rotation direction of the rotation synchronization shaft portion 23 is as shown in FIG. As shown by the arrow V, the rotation direction is when observed from the right side to the left side in FIG. 5. The rotation direction of the worm wheel portion 41 (41 L, 41 R) is the same as that in FIG. It is assumed that the rotation direction is when observing in the direction.

When the manual handle portion 31 is rotated and the rotation synchronization shaft portion 23 is rotated counterclockwise (in the direction of arrow A in FIG. 5), both the left worm portion 42L and the right worm portion 42R rotate counterclockwise. . Since the left worm portion 42L and the right worm portion 42R mesh with the left worm wheel portion 41L and the right worm wheel portion 41R, respectively, the left worm portion 42L and the right worm portion 42R are left as shown in FIG. If having a screw-type threads, for example, threads sites left worm wheel portion 41L had meshed-contact with some initial point X ₀ of the thread of the left worm portion 42L, the rotation of the left worm portion 42L with the, it conveyed to the mobile point X _1. This means that the gear of the left worm wheel portion 41L is conveyed in the direction of arrow B in FIG. 5, and therefore the left worm wheel portion 41L rotates counterclockwise (indicated by arrow C in FIG. 5). direction). Further, the left rack portion 16L that meshes with the left worm wheel portion 41L that rotates counterclockwise moves downward (in the direction of arrow D in FIG. 5).

On the other hand, for example, threads site right worm wheel portion 41R which has been meshed-contact with some initial point Y ₀ of the thread of the right worm unit 42R in association with the rotation of the right worm portion 42R, move the point Y ₁ Carried to. This means that the gear of the right worm wheel portion 41R is conveyed in the direction of arrow E in FIG. 5, and therefore the right worm wheel portion 41R rotates clockwise (the direction of arrow F in FIG. 5). ). Further, the right rack portion 16R that meshes with the right worm wheel portion 41R that rotates clockwise moves downward (in the direction of arrow G in FIG. 5).

  As shown in FIG. 5, the left-handed left worm wheel portion 41L is disposed above and meshed with the left-handed left worm portion 42L, while the left-handed right worm wheel portion 41R is left-handed. When placed below the right worm portion 42R and meshed, the former left worm wheel portion 41L rotates counterclockwise to lower the left-handed left rack portion 16L, and the latter right worm wheel portion 41R The left-hand rack type right rack portion 16R is synchronously lowered by rotating around.

  When the manual handle portion 31 is rotated clockwise and the rotation synchronization shaft portion 23 is rotated clockwise (in the reverse direction of the arrow A in FIG. 5), the left rack portion 16L is raised in the reverse direction of the arrow D in FIG. At the same time, the right rack portion 16R can also be raised synchronously in the direction opposite to the arrow G in FIG. Furthermore, all of the threads of the worm part 42, the worm wheel part 41, and the rack part 16 can be replaced from a left-hand thread type to a right-hand thread type.

  As shown in FIG. 5, when the right worm wheel portion 41W is arranged above the right worm portion 42R and meshed instead of the right worm wheel portion 41R arranged below the right worm portion 42R and meshed, The right worm wheel portion 41W rotates in the same direction as the left worm wheel portion 41L. For example, when the left worm wheel portion 41L rotates in the counterclockwise direction (the direction of arrow C in FIG. 5), the right worm wheel portion 41W also rotates in the counterclockwise direction (the direction of arrow W in FIG. 5). Since it rotates, the moving direction of the left rack part 16L and the moving direction of the right rack part 16R are reversed, and cannot be synchronized in one direction.

  By the way, also in the article storage shelf raising / lowering apparatus described in the said patent document 3, a pair of support | pillar provided with the rack is raised / lowered by the combination of a rack, a worm wheel, and a worm. However, in this article storage shelf lifting device, as described above, the left-handed screw type and the right-handed screw type must be used in combination. FIG. 7 is a schematic diagram illustrating a combined structure of a rack, a worm wheel, and a worm in the article storage shelf lifting device described in Patent Document 3. That is, a left-handed left worm part 62L is provided at the left end of the operating shaft 63, and a right-handed right worm part 62R is provided at the right end. Therefore, the left worm wheel portion 61L that meshes with the left-handed left worm portion 62L is a left-handed screw type, and the right-side worm wheel portion 61R that meshes with the right-handed right worm portion 62R is a right-handed screw type. Similarly, the left rack portion 66L meshing with the left-handed left worm wheel portion 61L is a left-handed screw type, and the right rack portion 66R meshing with the right-handed right worm wheel portion 61R is a right-handed screw type.

  When the operating shaft 63 is rotated counterclockwise (in the direction of arrow P in FIG. 7; observed from the direction of arrow M), both the left-handed left worm part 62L and the right-handed right worm part 62R are counterclockwise. Rotate around. When the left-handed left worm portion 62L rotates counterclockwise, the gear meshing with the left worm portion 62L is conveyed in the direction of arrow Q in FIG. 61L rotates counterclockwise (in the direction of arrow R in FIG. 7). Further, the left rack portion 66L that meshes with the left worm wheel portion 61L that rotates counterclockwise moves downward (in the direction of arrow S in FIG. 7).

  On the other hand, when the right-handed right worm portion 62R rotates counterclockwise, the gear meshing with the right worm portion 62R is conveyed in the direction of arrow T in FIG. 7, contrary to the case described in FIG. Therefore, the right worm wheel portion 61R rotates clockwise (in the direction of arrow U in FIG. 7). Further, the right rack portion 66R that meshes with the right worm wheel portion 61R that rotates clockwise moves downward (in the direction of arrow V in FIG. 7).

  As shown in FIG. 7, the left-handed left worm wheel portion 61L is disposed above and meshed with the left-handed left worm portion 62L, and the right-handed right worm wheel portion 61R is also fitted to the right-handed right-hand side. By disposing and engaging above the worm portion 62R, the former left worm wheel portion 61L is rotated counterclockwise to lower the left-handed left rack portion 66L, and the latter right worm wheel portion 61R is moved to the clockwise direction. The right-hand rack type right rack portion 66R is lowered by rotating around.

  As described above, in the conventional lifting device, a left-handed screw type and a right-handed screw type are required, whereas in the present invention, the left worm wheel portion 41L is disposed above the left worm portion 42L and meshed. On the other hand, by disposing the right worm wheel portion 41R below the right worm portion 42R and meshing it, only one of the left-handed screw type and the right-handed screw type can be used. Of course, the left worm wheel portion 41L may be disposed below the left worm portion 42L and the right worm wheel portion 41R may be disposed above the right worm portion 42R in the opposite direction. That is, one of the worm wheel portions is disposed above the worm portion, and the other worm wheel portion is disposed below the worm portion. As far as the present inventor knows, no device has been known so far that uses only one of the left-handed screw type and the right-handed screw type to synchronize two or more lifting columns and move them up and down.

  The top / bottom lift desk of the present invention is not only very simple to move up and down to adjust the height of the top section as described above, but after the height adjustment operation, simply stop the manual handle section. By simply placing it, the top plate can be stably maintained in an immobile state. In addition, it is possible to provide a lock means in the manual handle portion to maintain the immobility state satisfactorily, and to prevent the lifting / lowering operation from occurring even when the manual handle portion is accidentally touched in the stationary state. Furthermore, a detachable manual handle part, a foldable manual handle part that can fold the grip part, or a slide type that releases the meshing of the gear mechanism that transmits the rotational movement from the manual handle part to the rotation synchronization shaft part. Using the manual handle portion, erroneous contact in a stationary state can be prevented.

The top / bottom lift table of the present invention can be applied not only to a two-legged desk but also to a desk having three or more legs. A mode applied to a four-legged desk is shown in FIG.
FIG. 6 is a schematic view of an embodiment having four lifting columns 13L, 13R, 13A, 13B, four guide holding legs (not shown), and three rotation synchronizing shafts 23, 23L, 23R. It is explanatory drawing. The first rotation synchronization shaft portion 23 includes a left worm portion 42L at the left end portion and a right worm portion 42R at the right end portion. The worm portions 42L and 42R are engaged with the left worm wheel portion 41L and the right worm wheel portion 41R, respectively. Further, the left worm wheel portion 41L and the right worm wheel portion 41R are respectively connected to the left rack portion 16L ( The first rack part) and the right rack part 16R (second rack part) mesh with each other.

  As described with reference to FIG. 5, the left worm wheel portion 41L and the right worm wheel portion 41R are disposed one above the first rotation synchronization shaft portion 23 and the other is disposed below. The left rack portion 16L (first rack portion) and the right rack portion 16R (second rack portion) are raised and lowered in the same direction with respect to the rotation direction of the first rotation synchronization shaft portion 23.

  The shaft of the left worm wheel portion 41L that meshes with the left worm portion 42L provided at the left end portion of the first rotation synchronization shaft portion 23 is extended as it is in one axial direction and acts as the second rotation synchronization shaft portion 23L. In addition, a pinion portion 41A is provided at the end of the extension destination. Similarly, the shaft of the right worm wheel portion 41R meshing with the right worm portion 42R provided at the right end portion of the first rotation synchronization shaft portion 23 is also parallel to the second rotation synchronization shaft portion 23L in the same direction. It is extended as it is and acts as the third rotation synchronization shaft portion 23R, and is provided with a pinion portion 41B at the end of the extension destination. The pinion portion 41A provided at the tip of the second rotation synchronization shaft portion 23L meshes with the third rack portion 16A, and the pinion portion 41B provided at the tip of the third rotation synchronization shaft portion 23R It meshes with the 4 rack part 16B.

  Here, when the manual handle portion 31 is rotated and the first rotation synchronization shaft portion 23 is rotated in the direction of the arrow X via the gears 34 and 35, for example, the left worm wheel portion 41L and its shaft (second shaft). The rotation synchronization shaft portion 23L) rotates in the direction of arrow Y, and the right worm wheel portion 41R and its shaft (third rotation synchronization shaft portion 23R) rotate in the direction of arrow Z. Since the left worm wheel portion 41L and the pinion portion 41A provided at the tip of the second rotation synchronization shaft portion 23L are provided coaxially, they rotate in the same direction (the direction of arrow Y). Similarly, the right worm wheel portion 41R and the pinion portion 41B provided at the tip of the third rotation synchronization shaft portion 23R are also provided on the same axis, and thus rotate in the same direction (the direction of the arrow Z). Accordingly, the first rack portion 16L, the second rack portion 16R, the third rack portion 16A, and the fourth rack portion 16B that mesh with the left worm wheel portion 41L, the right worm wheel portion 41R, the pinion portion 41A, and the pinion portion 41B, respectively. Ascend and descend in synchronization with each other in the same direction, and accordingly, the four elevating support columns 13L, 13R, 13A, and 13B also ascend and descend in synchronization. In FIG. 6, for convenience of explanation, the worm wheel portions and the rack portions that are actually meshed with each other are illustrated separately from each other.

  In the case of applying the top / bottom desk of the present invention to a desk having three legs, for example, three rotation synchronization shafts are connected to each other so as to be rotatable with a bevel gear at one end thereof. A combination of a worm part, a worm wheel part, and a rack part is provided at the other end of the three rotation synchronizing shafts radially expanded from the central connection point, so that three elevating struts and three guide holding legs are provided. Can be applied to desks with.

Although the top / bottom desk of the present invention has been described along the particular embodiment illustrated, the above description is not intended to limit the scope of the present invention.
For example, the top plate portion may include not only a single (one) flat plate but also a two or more shelf plate-like flat plate partially or entirely depending on the application.
Alternatively, for example, an electric motor or the like can be used as the rotating means for rotating the rotation synchronization shaft portion instead of the manual handle portion.

Furthermore, as shown in FIGS. 1 and 2, the guide holding leg part and the lifting column part can be slidably guided, as shown in FIGS. 1 and 2, in addition to the mode in which the guide holding leg part is inserted into the lifting pillar part. Moreover, it can also be an aspect which inserts a raising / lowering support | pillar part into the inside of a guide holding leg part. Further, as shown in FIG. 1 and FIG. 2, the guide holding leg portion is provided not only on each lifting / lowering strut portion but also having a plurality of portions (for example, hollow portions) for guiding a plurality of lifting / lowering strut portions. It can also be a guide holding leg.
The rack part, the worm wheel part, and the region where the worm part mesh with each other, as shown in FIGS. 1 to 4, are not only housed inside the guide holding leg part, but can also be exposed. In order to avoid danger during rotation and to prevent contamination by touching the lubricating oil, it is preferable to store it inside the guide holding leg.
In addition, in the top / bottom lift desk of the present invention, it is also possible to enhance the design by using decorative paper or a decorative plate on a portion that can be observed from the outside (for example, the side of the top plate or the guide holding leg). Is possible.

  The top / bottom desk of the present invention can be applied to any desk, such as a learning desk, office desk, computer desk, operating table, experimental table, work table, figurine table, cooking table, cooking table, display. The present invention can be applied to a table, a bed table (for example, a bed table for nursing care), an ironing table, a TV table, a stepladder, a chair, or a simple elevator.

It is a perspective view which shows the top plate raising / lowering desk of 1 aspect of this invention. It is a disassembled perspective view of the top plate elevating type desk shown in FIG. It is a fragmentary perspective view which shows the structure of the rack part, worm wheel part, and worm | warm part of the top plate raising / lowering desk shown in FIG. 1 with a rotation synchronous axial part, a manual handle part, etc. FIG. It is a partially exploded perspective view explaining that the worm wheel part and rack part of the top-plate raising / lowering desk shown in FIG. 1 mesh. FIG. 2 is a schematic explanatory view showing a mechanism in which the rotary motion of the manual handle portion is converted into the lift motion of the rack portion in the top / bottom lift desk shown in FIG. 1. It is explanatory drawing which shows typically the aspect applied to the four leg type desk. It is explanatory drawing which shows typically the combined structure of the rack in the conventional goods storage shelf raising / lowering apparatus, a worm wheel, and a worm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Top plate elevating type desk; 11 ... Elevating unit; 12 ... Top plate part;
13, 13A, 13B, 13L, 13R ... lifting column part;
14 ... auxiliary frame; 15 ... inner wall surface;
16, 16A, 16B, 16L, 16R ... rack part;
21 ... base unit; 22 ... guide holding leg;
23, 23L, 23R ... rotation synchronization shaft portion; 24 ... base portion;
25 ... Reinforcing part; 26 ... Worm wheel cover part; 27 ... Opening part;
31 ... Manual handle part; 32 ... Handle shaft bearing part;
33: gear cover; 34, 35 ... gear; 36 ... rotating shaft;
41, 41L, 41R, 41W ... worm wheel part;
41A, 41B ... pinion part; 42, 42L, 42R ... worm part;
43 ... Through-hole bearing part; 44 ... Projection bearing part;
61L, 61R ... Worm wheel part; 62L, 62R ... Worm part;
63: Operating shaft; 66L, 66R: Rack section.

Claims (4)

A top / bottom desk that includes a lift unit and a base unit,
(A) The lifting unit is
(1) a top plate portion; and (2) a rack portion that extends downward from the lower surface of the top plate portion, can be moved up and down integrally with the top plate portion, and extends in the vertical direction. Including two or more lifting columns,
(B) The base unit is
(1) Provided in correspondence with each of the above-mentioned lifting column parts, and slidably guide each lifting movement of the lifting column part via a worm wheel part meshing with the rack part, Guide holding legs that hold the lifting unit,
(2) a rotation synchronization shaft portion having a worm portion fixed to the guide holding leg portion and meshing with the worm wheel portion, and (3) a rotation means for rotating the rotation synchronization shaft portion,
All the worm parts provided in the rotation synchronization shaft part consist only of a right-handed worm part or only a left-handed worm part,
A top plate elevating type table, wherein the worm portion and the worm wheel portion are engaged so that the elevating motion of the elevating support column portion is synchronized in one direction as a whole.   The top plate elevating type desk according to claim 1, wherein there are two elevating support columns, two guide holding legs, and one rotation synchronizing shaft.   Of the worm parts provided at both ends of the rotation synchronizing shaft part, one worm part meshes with the worm wheel part provided above the worm part, and the other worm part is below the worm part. The top-table lifting type desk according to claim 2, which meshes with the provided worm wheel part.   There are four elevating struts, four guide holding legs, three rotation synchronization shafts, the first rotation synchronization shaft has worms at both ends thereof, and the second The rotation synchronization shaft portion is coaxial with a worm wheel portion meshing with a worm portion provided at one end of the first rotation synchronization shaft portion, and a third rotation synchronization shaft portion is the first rotation synchronization shaft. A third rotation synchronization shaft that is coaxial with a worm wheel portion that meshes with a worm portion provided at the other end portion of the shaft portion, has a pinion portion at the other end portion of the second rotation synchronization shaft portion, and A worm wheel portion having a pinion portion at the other end portion of the first portion and meshing with a worm portion at each end portion of the first rotation synchronization shaft portion includes a rack portion of the first elevating strut portion and a second The pinion part which meshes with the rack part of the lifting column part and is provided at the end of the second rotation synchronization shaft part is the third part. The top-plate elevating type table according to claim 1, wherein the top / bottom lifting table according to claim 1, which meshes with the rack portion of the elevating support column and the pinion portion provided at the end of the third rotation synchronizing shaft unit meshes with the rack portion of the fourth elevating support column. .

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