JP4036919B2 - Movable elbow on the chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair, and more particularly to a movable armrest suitable as an office chair that can adjust the armrest to an optimal position and orientation in accordance with the work situation.
[0002]
[Prior art]
An office chair includes an armrest with an armrest provided on both sides of a seat.
[0003]
Conventionally, a chair with an armrest as described above has armrests 4, 4 at the upper ends of arms 3, 3 rising on both sides of the seat 2 of the chair 1 as shown in FIG. It can be fixed at a predetermined height position, or the above-mentioned arms 3 and 3 can be vertically expanded and contracted, and the height positions of the upper armrests 4 and 4 are matched to the body shape of the seated person. In general, it is designed to be adjustable.
[0004]
[Problems to be solved by the invention]
However, in the case where the armrests 4 and 4 are fixedly provided as in the chair with the above-mentioned conventional armrests, there is no special inconvenience for general office work, but the VDT work has been steadily increasing recently. In this case, there are various problems such as the elbow pads 4 and 4 being in the way of work or being unable to take an easy posture. This cannot be solved by adjusting the height of the elbow pads 4 and 4.
[0005]
[Means for Solving the Problems]
According to the present invention, the position of the elbow pads in the front-rear direction and the direction in the left-right direction can be freely adjusted without requiring a special adjustment operation, and the most convenient form can be quickly obtained. An object of the present invention is to provide a movable elbow for a chair that can be used.
[0006]
In order to solve the above problems, the present invention provides a friction plate fixed to the upper end of an arm standing on the left and right sides of a chair, and an upper surface plate contacting the upper surface of the friction plate on the lower surface side of the armrest body and the friction plate. And a lower surface plate that has a free hole through which the support portion fits with a required play and the friction plate cannot pass and holds the friction plate between the upper surface plate and the free hole of the lower surface plate. The elbow rest can move in a horizontal plane with respect to the arm within the range, and the bottom plate is fixed to the elbow rest main body at a distance below the lower surface plate, and the lower surface plate is interposed between the lower surface plate and the bottom plate. The object is to have a finger pinching prevention plate that freely blocks the play hole .
[0007]
Preferably, the friction plate has a plurality of convex portions on the upper surface with an elastic body interposed on the lower surface, and the convex portions are pressed against the lower surface of the upper surface plate to give friction to the elbow pads. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0009]
2 shows the upper surface of the elbow rest 5 according to the present invention, FIG. 3 shows the lower surface, and FIG. 4 shows a cross section taken along the line AA of FIG. 2. In FIG. 2 and FIG. 1 is the seat 2 side of the chair 1, and the right side is the back 6 side (rear end) of the chair 1.
[0010]
A support portion 8 having a substantially oval shape with a narrow tip in a plan view is fixed to the attachment portion 7 at the upper end of the arm 3 standing on the left and right of the chair 1 by bolts 9 and 9 together with the friction plate 10. 10 is sandwiched between an upper surface plate 13 and a lower surface plate 14 which are fastened together with screws 12, 12 on the lower surface side of the elbow rest main body 11.
[0011]
In the illustrated embodiment, the friction plate 10 includes a first friction plate 15 made of a synthetic resin and a friction plate 15 as shown in FIG. The first friction plate 15 is overlapped on the lower surface and has the same size and the same shape as the second friction plate 16, and the first friction plate 15 has a narrow end on the front end side of the armrest 5 in plan view. It has a substantially oval shape, and a plurality (six in the figure) of convex portions 17, 17... Are formed near both ends in the longitudinal direction and on both side positions.
[0012]
The convex portion 17 has a circular shape with a required size, and the upper surface of the convex portion 17 has a spherical shape projecting upward from the upper surface of the first friction plate 15. A cylindrical projecting shaft 18 is formed on the lower surface of the center, and the projecting shaft 18 is slidably inserted into a guide hole 19 formed in a corresponding portion of the second friction plate 16. Thus, the convex portion 17 is allowed to bend downward. An elastic body 17a such as rubber is interposed between the lower surface of the convex portion 17 and the upper surface of the second friction plate 16, and elastically projects the convex portion 17 upward. 5 and 6, reference numerals 15a and 15a denote insertion holes for the bolts 9 and 9, respectively.
[0013]
And the convex part 17 of the said 1st friction board 15 is bent and pinched | interposed between the said upper surface board 13 and the lower surface board 14 slightly, and the friction board 10 is carried out by these convex parts 17, 17 .... An appropriate frictional force is generated, and the elbow rest main body 11 stays at an arbitrary position with respect to the friction plate 10 by the frictional force and is held so as not to move unnecessarily.
[0014]
The lower surface plate 14 is formed with a free hole 20 having a size such that the support portion 8 to which the friction plate 10 is attached is loosely fitted and the friction plate 10 does not come out. Thus, the elbow rest main body 11 can be moved back and forth or turned in any direction with respect to the arm 3.
[0015]
In this embodiment, the shape of the free hole 20 is a rectangular shape that is long in the longitudinal direction of the elbow rest body 11, but a desired hole shape can be formed according to the shape of the support portion 8. Further, it is desirable to use a metal plate (for example, a steel plate) for the upper surface plate 13 and the lower surface plate 14 so as not to bend freely.
[0016]
In the illustrated embodiment, a finger pinching prevention plate 21 is provided to prevent a finger from entering the free hole 20 of the lower surface plate 14 when the hand is put on when moving the elbow rest 5.
The finger pinching prevention plate 21 is loosely interposed between the lower surface of the lower surface plate 14 and the bottom plate 22 fixed to the lower surface of the elbow rest body 11, and is formed of a synthetic resin so as to be slippery. The lower plate 14 has an outer shape larger than the free hole 20, and has a guide hole 23 in the center. The guide hole 23 is loosely fitted to the support portion 8, and the guide hole 23 is moved when the elbow rest 5 is moved. The inner periphery is configured to always block most of the lower surface of the free hole 20 of the lower surface plate 14 by hitting the support portion 8.
[0017]
Next, a basic operation without the finger pinching prevention plate 21 in the embodiment will be described with reference to FIGS.
[0018]
FIG. 7 collectively shows the movement range of the elbow rest 5 with respect to the arm 3 (support portion 8), and FIGS. 8A to 8F show typical movement states of the movement ranges. The left side is the front side with respect to the chair, and the upper side is the seat portion 2 side of the chair.
[0019]
That is, FIG. 8 (A) shows a state in which the elbow rest 5 is advanced diagonally outward of the chair, and when the left and right elbow rests 5 are similarly moved, the distance between the elbow rests is maximized. A corner portion 20 a on the seat portion 2 side at the rear end of the 14 free holes 20 is in contact with the rear end of the support portion 8, and most of the free holes 20 are closed by the friction plate 10.
[0020]
FIG. 8 (B) shows a state in which the elbow rest 5 is retracted diagonally inward of the chair. If the left and right elbow rests 5 are similarly moved, the distance between the elbow rests is minimized. The free hole 20 is in contact with the corner 20b on the opposite side of the seat 2 at the front end.
[0021]
FIG. 8C shows a state in which the elbow rest 5 has been advanced diagonally inward of the chair. If the left and right elbow rests 5 are similarly moved, the elbow spacing is reduced to a minimum. At this time, the corner 20C opposite to the seat 2 at the rear end of the free hole 20 of the lower surface plate 14 contacts the rear end of the support portion 8, and more than half of the free hole 20 is blocked by the friction plate 10. It is peeling off.
[0022]
FIG. 8D shows a state in which the tip of the armrest 5 is turned outward with respect to the chair from the state shown in FIG. 8A, and FIG. FIG. 8F shows a state in which the tip of the armrest 5 is greatly turned inward with respect to the chair.
[0023]
In addition to these states, even at any intermediate position shown in FIGS. 8A to 8F, the friction plate 10 is maintained at that position by friction between the upper surface plate 13 and the lower surface plate 14, and an elbow is placed on the position. be able to.
[0024]
FIGS. 9A and 9B are illustrations in the case where there is a finger pinching prevention plate 21. FIG. 9A corresponds to FIG. 8B and is largely open in the state of FIG. 8B. Even though the portion of the free hole 20 is almost blocked by the finger pinching prevention plate 21 that is left behind when the guide hole 23 hits the support portion 8, even if the finger is applied to the lower surface of the elbow rest 5, the finger does not play. Entering the hole 20 is prevented.
[0025]
FIG. 9 (B) corresponds to FIG. 8 (E) and shows that the empty part of the free hole 20 at that time is blocked by the finger pinching prevention plate 21.
[0026]
Although only a representative example of the operation is shown in FIG. 9, the finger pinching prevention plate 21 blocks most of the empty portion of the free hole 20 for any movement of the elbow pad 5, and the finger is pinched by mistake. Is prevented.
[0027]
In the illustrated embodiment, the support portion 8 is structured to be fastened together with the friction plate 10 and the bolts 9, 9 to the attachment portion 7 at the upper end of the arm 3, but this support portion 8 is attached to the arm 3. The friction plate 10 may be composed of a first friction plate 15 and a second friction plate 16, and the convex portion of the first friction plate 15. 17 shows a case in which the protruding shaft 18 on the lower surface of 17 is fitted into the guide hole 19 of the second friction plate 16, but this friction plate 10 is provided between the upper surface plate 13 and the lower surface plate 14 if necessary. Other configurations may be used as long as they can move relative to each other in a frictional manner.
[0028]
【The invention's effect】
As described above, according to the present invention, the armrest of an office chair can be moved steplessly to an arbitrary desired position, so that the armrest is placed at an optimal armrest position according to the work situation. It can be placed and can best support the working posture. In addition, the movement of the elbow pads is simple because there is no need to operate a special operating member, and it is only necessary to slide or turn the elbow pads themselves in the desired direction, and to move them in a complex manner. Can get a high elbow. In addition, since the finger pinching prevention plate is provided, it is possible to reliably prevent a finger from being pinched by mistake when moving the elbow.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a chair to which the present invention is applied.
FIG. 2 is a top view of an armrest according to the present invention.
FIG. 3 is a bottom view of the same.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a plan view of the first friction plate in FIG. 4;
6 is a cross-sectional view taken along line BB in FIG.
FIG. 7 is an explanatory view collectively showing the movement of the elbow pads.
FIGS. 8A to 8F are explanatory views showing a representative example of a state of movement of the armrest of FIG.
FIGS. 9A and 9B are explanatory diagrams of typical examples showing movement when a finger pinching prevention plate is provided.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chair 2 Seat part 3 Arm 4, 5 Elbow rest 6 Backrest 8 Support part 10 Friction plate 11 Elbow rest main body 13 Upper surface plate 14 Lower surface plate 15 First friction plate 16 Second friction plate 17 Convex part 17a Elastic body 18 Projection Shaft 19 Guide hole 20 Free hole 21 Finger pinching prevention plate 22 Bottom plate 23 Guide hole

Claims (2)

A friction plate is fixed to the upper end of the arm standing on the left and right sides of the chair, and the upper surface plate contacting the upper surface of the friction plate and the support portion of the friction plate are fitted to the lower surface side of the armrest body with required play. And a lower surface plate having a free hole through which the friction plate cannot pass and holding the friction plate between the upper surface plate and an armrest with respect to the arm within the range of the free hole of the lower surface plate. To be able to move in a horizontal plane ,
A bottom plate is fixed to the elbow rest body spaced apart below the lower surface plate, and a finger pinching prevention plate is provided between the lower surface plate and the bottom plate to block the play hole of the lower surface plate. <Br / > A movable armrest in a chair characterized by that.   2. The friction plate has a plurality of convex portions on an upper surface with an elastic body interposed on a lower surface, and the convex portions are in pressure contact with the lower surface of the upper surface plate to give friction to an elbow rest. A movable elbow for the listed chair.

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