JPH08395A - Vertical adjustment device for armrest of chair - Google Patents

Abstract

PURPOSE:To easily and properly make vertical adjustment with the vertical positions of both armrests kept approximately horizontal, while arms are being placed thereon. CONSTITUTION:When a motor 14 is rotated via a switch section 5, the rotation thereof is converted to the telescopic motion of a telescopic device 6, and armrests 4 coupled to two armrest bases 3 respectively erected on both sides of a seat are thereby elevated in the same direction concurrently. Also, the elevation of both armrests 4 in a reverse direction, if desired, can be realized by reversing the motor via the switch section 5. Thus, a user can easily and properly adjust the vertical positions of both armrests 4, while keeping the positions approximately horizontal, through one-hand switch operation with his/her arms placed on one or both of the armrests 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elbow pad up-and-down adjusting device used for chairs for offices, automobiles, etc., which is provided with an elbow pad for standing upright on the side of the seat. The present invention relates to an elbow pad up-and-down adjusting device that is moved up and down by driving a forward and reverse drive motor.

[0002]

2. Description of the Related Art Conventionally, as an up-and-down adjusting device for an elbow pad mainly used in office chairs, there is JP-B-63-130, etc., but these are the elbow bases standing upright on the side of the seat. The elbow pad is mounted so as to be slidable in the vertical direction, and also has a stopping means for manually stopping the sliding of both members at a stepwise or arbitrary position.

[0003]

When adjusting the vertical position of the elbow rest by using these devices, the stop means is once manually released and the elbow rest is lifted by hand or pushed up. Then, after adjusting to the body shape of the user, the stop means is manually operated to stop the vertical position of the elbow rest.

For this reason, it is necessary to operate the stop means with one hand and operate the elbow rest with the other hand, and the operability is poor, and the user moves the elbow rest up and down with the arm rested on the elbow rest. Since the position cannot be adjusted, there is a drawback that it is difficult to adjust the elbow pad to a proper position.

[0005] Further, Japanese Utility Model Publication No. 3-17709 discloses a device in which an elbow rest is raised and lowered by driving a forward and reverse drive motor with respect to an elbow base which is erected on the side of a seat. It was mainly designed for one elbow rest, and if this device is applied to both elbow rest chairs,
Since the vertical position of each elbow pad must be adjusted individually, it was very difficult to adjust the vertical positions of both elbow pads to be kept uniform.

The present invention solves the above-mentioned drawbacks of the prior art and allows the user to keep his or her arm rested on one or both elbow pads while keeping the vertical positions of both elbow pads substantially horizontal. It is an object of the present invention to provide an up / down adjustment device for an elbow pad of a chair, which allows easy and reliable up / down adjustment.

[0007]

The elbow pad up-and-down adjusting device of the present invention is such that the elbow pads are vertically slidably and non-rotatably fitted to the elbow bases standing upright on both sides of the seat. ,
At least one end of an extendable device that can be extended and retracted by driving a motor that can be driven in the reverse direction via a switch part is attached to the elbow base, and the other end is attached to the elbow pad.
It is characterized in that the elbow pads can be slid vertically with respect to the elbow base, and that both elbow pads are interlocked via the switch portion.

The elbow pad up-and-down adjusting device of the present invention comprises:
It is preferable that a single motor can vertically move the respective expansion and contraction devices of both elbow bases through the interlocking mechanism.

The elbow pad up-and-down adjusting device of the present invention comprises:
It is preferable that the switch portion of the drive motor is provided at a predetermined position of the elbow pad.

The elbow pad up-and-down adjusting device of the present invention comprises:
The elbow base is formed in a hollow shape, and the expansion / contraction device is provided inside the elbow base, and a guide portion facing downward is formed below the elbow pad, and the elbow pad is provided through the guide groove formed in the elbow pad. Is preferably fitted to the elbow base.

The elbow pad up-and-down adjusting device of the present invention comprises:
A telescopic device housed in the elbow base that stands on each side of the seat, and one drive motor fixed below the seat surface,
It is preferable that they are connected so as to interlock with each other via a connecting rod.

[0012]

[Operation] When the motor is rotated via the switch,
The rotation of the motor is converted into a telescopic motion of the telescopic device, and the elbow pads respectively fitted to the two elbow bases standing upright on both sides of the seat surface are simultaneously moved up and down in the same direction. If you want to raise and lower both elbow pads in the opposite direction, you can rotate the motor in reverse through the switch. Therefore, the user can easily and surely adjust the vertical position while keeping the vertical position of both elbow pads substantially horizontal by operating the switch with one hand while placing the hand on either one or both elbow pads. it can.

Since both elbow bases can be simultaneously moved up and down by one motor, the structure is simplified and the risk of malfunction can be reduced because a plurality of motors are not used.

By arranging the switch part at a predetermined position of the elbow rest, the user can adjust the elbow rest up and down with one hand while sitting and with both hands on the elbow rest.

Since the telescopic device is installed inside the elbow base, the internal mechanism cannot be seen from the outside, the appearance is improved, and the elbow rest is fitted with the guide portion and the guide groove. It can be slid up and down with respect to the base and can not be rotated.

Each expansion device is fixed below the seat surface.
By connecting two motors via a connecting rod, both elbow pads can be interlocked with one motor, so it is possible to save space in the motor installation part without using a motor for each telescopic device. In addition, by installing the motor below the inconspicuous seat surface, the external design is also improved.

[0017]

Embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 is an overall perspective view of a chair to which the present invention is applied. Elbow bases 3 and 3, which are respectively erected from the sides of a supporting portion 2 formed below a seat surface 1, and the elbow base 3 described above. 3 shows an armrest portion and the like constituted by elbow pads 4 and 4 fitted from above. Reference numeral 5 denotes a switch portion for switching the forward / reverse drive of the motor 14 of the expansion / contraction device 6 housed in the elbow base portion 3. In this example, the switch portion 5 is provided only on the upper surface of one of the two elbow pads 4, 4. There is.

2 (a) and 2 (b) are sectional views of the main part of the armrest portion having the switch portion 5, in which the guide guides 7, 7 which are oriented vertically from the lower surface of the armrest 4 are arranged on the inner circumference. The guide tube 8 provided in the above is extended. The guide cylinder 8 is configured so that the guide members 7, 7 can slide up and down in guide grooves 9, 9 formed on the outer peripheral side surface of the elbow base portion 3.
Is inserted from above. Here, the guide members 7, 7
The guide grooves 9 and 9 constitute a rotation restricting means, and the elbow rest 4 is vertically slidable and non-rotatable with respect to the elbow base 3.

A telescopic device 6 provided inside a hollow elbow base 3 includes a cylinder 13, a motor 14 and a gear box 15, and an ascending / descending vertically slidably fitted inside the cylinder 13. The one end of the expansion / contraction device 6 has a protrusion 17 provided below the gear box 15 and two attachment plates 18, 18 fixed to a predetermined portion of the inner circumference of the elbow base 3. It is clamped and is pivotally mounted in the elbow base 3 by a pin 19 penetrating the projecting piece 17 and the mounting plates 18, 18. The other end has a mounting plate 1 fixed to the upper end of the elevating member 16.
0 is bolted to the lower plate 11 on the lower surface of the elbow pad 4.

As described above, since the telescopic device 6 and the elbow base 3 are pivotally attached to each other by the pin 19, even if the elbow base is slightly bent by the force applied to the elbow rest 4, the guide tube 8 of the elbow rest 4 will be. The outer circumference of the elbow base 3 can be smoothly slid up and down.

Further, as shown in FIG.
The extended power cord 12 is the lower plate 11 of the elbow pad 4.
Through the communication port 27 formed at a predetermined position, and through the switch portion 5 in the hollow elbow pad 4 and further through the communication port 2
7, passing through the elbow base 3, and connected to a battery (not shown) fixed to the back surface of the seat surface 1.

Also, the motor 1 in the other elbow base 3
A cord 4 (not shown) also passes through the inside of the support member 2, extends into the elbow pad 4 having the switch portion 5, and is connected to the switch portion 5 in the same manner as the above-described energizing cord 12.
Therefore, the motors 14 and 14 are driven simultaneously via the switch 5.

As shown in FIG. 3, the motor 14 is fixed on the gear box 15 of the expansion / contraction device 6, and the drive shaft 20 of the motor 14 is connected to the gear box 15.
The first gear 21 is fixed to the first gear 21, the second gear 22 is engaged with the second gear 22, and the second gear 22 is engaged with the third gear 23. are doing.

The third gear 23 is connected to a screw rod 24, and the upper end of the screw rod 24 extends from inside the gear box 15 to inside the cylinder 13 above. Further, a male screw portion 25 is formed on the outer periphery of the screw rod 24 extending inside the cylinder 13.

The male screw portion 25 of the screw rod 24 is screwed into the female screw portion 26 formed on the inner circumference of the elevating member 16, and the relative rotation of the screw rod 24 and the elevating member 16 causes the two to move relative to each other. It can be moved up and down. Further, the inside of the elevating member 16 is hollow so that the screw rod 24 can be penetrated when the elevating member 16 is lowered by the relative rotation.

Next, the operation of this embodiment will be described with reference to FIGS. When attempting to raise the armrests 4 and 4 of the chair in the state shown in FIG. 1 using the motors 14 and 14, the switch portion 5 arranged at a predetermined position on the upper surface of one of the armrests 4 is raised. By pressing the switch, the motors 14, 14 of the two elbow pads 4, 4 rotate simultaneously, and the drive shafts 20, 20, the first gears 21, 21, the second gears 22, 2,
The rotational force is transmitted to the second and third gears 23 and 23 (the number of gears is not limited), and the screw rods 24 and 24 rotate. At that time, the elevating members 16 and 16 are fixed to the elbow pads 4 on the lower plates 11 and 11 of the elbow pads via the mounting plates 10 and 10, and the elbow pads 4 and 4 are attached to the elbow bases 3 and 3. Since the rotation is restricted, the screw rods 24, 24 rotate with respect to the elevating members 16, 16. Female screw portions 26, 26 are formed on the elevating members 16, 16 and screw rods 24,
Since the male screw portions 25, 25 of 24 are screwed together, the screw rods 24, 24 raise the elbow pads 4, 4.

Next, when the armrests 4 and 4 of the chair are desired to be lowered, pressing the lowering switch of the switch portion 5 installed at a predetermined position of the armrest 4 causes the motors 14 and 14 to rotate in the reverse direction, and On the contrary, the elbow pads 4 and 4 can be lowered. Even when a rotating force is simply applied to the elbow pads 4 and 4 instead of the raising and lowering operation of the elbow pads 4 and 4, the elbow pads 4 and 4 are connected via the guide members 7 and 7 and the grooves 9 and 9. 3,
Since the rotation is restricted with respect to 3, it does not rotate.

As described above, the motors 14 and 14 are driven only by operating the switch portion 5 provided at a predetermined position on the upper surface of one of the elbow pads 4, and the elbow pads 4 and 4 are freely moved up and down at the same time. In addition to the above, the elbow pads 4 and 4 can be reliably held in any vertical position without locking when the motors 14 and 14 are stopped. Further, the user can easily adjust the elbow pads 4 and 4 to an arbitrary vertical position with one hand while keeping his / her hands on the elbow pads 4 and 4 without bothering his / her hands while sitting.

Further, since the electric motor 14 is used, the switch portion 5 can be installed at any position of the chair even when the motor 14 which is the driving portion is installed in the elbow base portion 3. Even if the elbow pad 4 is vertically moved, the switch portion 5 and the motor 14 are connected by the flexible cord 12 so that the vertical movement of the elbow pad 4 is not adversely affected.

FIG. 4 shows a second embodiment of the present invention, showing the construction of the transmission means of the expansion / contraction device 6.
The difference from the embodiment of the present invention is that the two elbow pads 4 and 4 provided on both sides of the seat surface 1 are vertically linked by a single motor 14 provided on the lower surface of the seat surface 1. is there.

In this second embodiment, the motor 14 is
It is bolted to a predetermined position on the lower surface of the seat surface 1 via a mounting bracket 29. The first gear 21 attached to the drive shaft 20 of the motor 14 is a support piece 3 fixed to the lower surface of the seat surface 1.
It meshes with the second gears 22, 22 attached to one end of the connecting rod 31 supported by 0. In addition, the second gear 2 is attached to the ends of the extending connecting rods 31 on both outer sides.
2'and 22 'are attached and mesh with the third gears 23 and 23 attached to the screw rods 24 and 24, and the respective gears constitute the transmission means via the connecting rod 31. Here, when the motor 14 rotates in one direction, the male screw portions 25, 25 and the female screw portions 26, 26 on both sides are reverse-threaded so that both elbow pads move up and down in the same direction. There is.

Next, the operation of the second embodiment of the present invention will be described with reference to FIG. When trying to raise the elbow pads 4 and 4,
Switch part 5 arranged on the upper surface of one of the elbow pads 4
By pressing the raising switch (not shown), the motor 14 rotates, and the drive shaft 20, the first gear 21, the second gears 22 and 22, and the second gears 22 and 22 '(the number of gears is limited). The rotating force is transmitted to the screw rods 24, 24 to rotate.

At this time, as in the first embodiment, the lifting member 16
Is fixed to the elbow pads 4, 4 whose rotation is restricted with respect to the elbow bases 3, 3 (not shown), so that the screw rod 2
The reference numerals 4 and 24 rotate with respect to the elevating members 16 and 16. Female screw portions 26, 26 are formed on the elevating members 16, 16, and the male screw portions 25, 25 of the screw rods 24, 24 are screwed into the female screw portions 26, 26. Raise. Further, when lowering, the lowering switch may be pressed and the operation reverse to the above may be performed.

In this embodiment, all the gears are bevel gears, but the gears are not limited to this. Particularly, the second gears 22 ', 22' and the third gears 23, 23 are connected by worm gears. Good. Alternatively, the first gear 21 and the second gears 22, 22 may be reduction gears, and the connecting rod 31,
31 and the screw rods 24, 24 may be connected by a universal joint.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.

For example, a male screw portion is formed on the outer periphery of the elevating member 16, and a drive shaft extending from the third gear into the cylinder 13 is formed into a hollow pipe having a female screw portion on the inner periphery. The male screw portion and the female screw portion may be reversed from the case of the above-described embodiment by screwing the elevating member 16.

[0037]

When the motor is rotated through the switch, the rotation of the motor is converted into the expansion and contraction motion of the expansion and contraction device, and the elbow pads respectively fitted to the two elbow bases which are respectively erected on both sides of the seating surface. At the same time, raise and lower in the same direction. If you want to raise and lower both elbow pads in the opposite direction, simply rotate the motor in the reverse direction via the switch. Therefore, the user can easily and surely adjust the vertical position while keeping the vertical position of both elbow pads substantially horizontal by operating the switch with one hand while placing the hand on either one or both elbow pads. it can.

[0038]

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chair according to a first embodiment of the present invention.

FIG. 2A is an enlarged cross-sectional view of the main part of FIG. 1, and FIG.
FIG. 7A is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a telescopic device.

FIG. 4 is a structural view of a main part of an expansion / contraction device according to a second embodiment of the present invention.

[Explanation of symbols]

1 seat surface 2
Support part 3 Elbow base part 4
Elbow pad 5 Switch part 6
Telescopic device 7 Guide member 8
Guide tube 9 Guide groove 10
Mounting plate 11 Lower plate 12
Energizing cord 13 Cylinder 14
Motor 15 Gearbox 16
Lifting member 17 Projecting piece 18
Mounting plate 19 pins 20
Drive shaft 21 First gear 22, 22 '
2nd gear 23 3rd gear 24
Screw rod 25 Male screw part 26
Female thread 27 Communication port 29
Mounting bracket 30 Support piece 31
Connecting rod

Claims (5)

[Claims] 1. An elbow base is erected on both sides of a seat so as to be vertically slidable and non-rotatably fitted to each other, and is expanded and contracted by driving a motor capable of forward and reverse driving at least through a switch portion. By attaching one end of a possible telescopic device to the elbow base and attaching the other end to the elbow rest, the elbow rest can be slid vertically with respect to the elbow rest, and both elbow rests can be connected to the switch portion. An up-and-down adjusting device for a chair elbow pad, which is characterized in that it is interlocked via the. 2. The up / down adjusting device for an elbow pad of a chair according to claim 1, wherein each telescopic device of both elbow bases can be moved up and down in the same direction by a single motor through an interlocking mechanism. 3. The up / down adjusting device for an elbow rest of a chair according to claim 1, wherein the switch portion of the drive motor is provided at a predetermined position of the elbow rest. 4. A guide groove formed in the elbow base, wherein the elbow base is formed in a hollow shape, a telescopic device is internally provided in the elbow base, and a guide portion facing downward is formed below the elbow pad. The elbow pad up-down adjusting device according to any one of claims 1 to 3, wherein the elbow pad is fitted to the elbow base via the. 5. An expansion / contraction device housed in an elbow base that is erected on both sides of the seat is connected to one drive motor fixed below the seat surface so as to interlock with each other via a connecting rod. An up-and-down adjusting device for an elbow pad of a chair according to any one of claims 1 to 4.