JP2004202062A - Headrest device of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily adjust the height of a headrest and rotate the headrest, and to improve the external design of a chair without projections in the outside of the chair. <P>SOLUTION: The chair has a seat part 3 on a pedestal 4 supported by legs 1. The front end of a backrest frame 5, L-shaped from the side view, is pivotally supported on the pedestal 4 so that the front end can oscillate in the vertical direction, and a backrest 6 is supported by the backrest frame 5. In addition, a headrest support 15 is supported to be slidable in the vertical direction by a backrest support 9 in a rear rising part of the backrest frame 5, and the headrest 16 is attached to the upper end of the headrest support 15 in such a way that the headrest can be frictionally rotated around a horizontal axis. A ratchet teeth line 19 is formed in the longitudinal direction in the headrest support 15, and an elastic engagement piece 20 fixed to the backrest support 15 is engaged with the ratchet teeth line 19. By moving the headrest support 15 upward/downward, the ratchet teeth line 19 bends and moves the elastic engagement piece 20. When the headrest support 15 is stopped, the elastic engagement piece 20 is engaged with a tooth of the ratchet teeth line 19 to lock the headrest support 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a headrest device for a chair, and more particularly to a headrest device suitable for being applied to an office chair.
[0002]
[Prior art]
Office chairs take a rearwardly inclined posture during computer work or the like, and it is necessary to support the head smoothly at that time.
[0003]
A headrest in a chair is generally used in a seat of an automobile or the like, and some office chairs have a headrest (for example, see Patent Document 1).
[0004]
The chair described in the above document has a headrest support mechanism attached to the back of the upper end portion of the backrest, and the height of the headrest and the rotational position in the front-rear direction can be adjusted by the support mechanism.
[0005]
[Patent Document 1]
JP 2001-314268 A
[Problems to be solved by the invention]
However, since the structure described in Patent Document 1 has a structure in which a headrest support mechanism is installed on the back of the center of the upper horizontal bar of a frame-shaped backrest frame surrounding the backrest, the support is provided on the upper back of the backrest. The mechanism has a protruding form, which significantly impairs the appearance design of the chair when used as an office chair.
[0007]
Also, when adjusting the height of the headrest, it is necessary to release the lock each time, and furthermore, it is necessary to operate with your hands behind the backrest, so it is extremely difficult to finely adjust the height of the headrest while sitting. It is not preferable in terms of operability.
[0008]
In view of this, the present invention provides a chair headrest device that does not travel to the upper back of the backrest, does not impair the appearance as a chair, and allows the height of the headrest and the front and rear rotation operation to be easily performed. It was made to provide.
[0009]
[Means for Solving the Problems]
As a means for solving the above-mentioned problem, the present invention provides a back frame having a seat on a support supported by a leg and having a substantially L-shape in a side view. In a chair supporting and supporting a backrest on the back frame, a headrest support column is slidably supported up and down on a back column of a rear rising portion of the back frame, and a headrest is horizontally laid on an upper end of the headrest support column. The headrest support column is formed so as to be rotatable about a shaft, a ratchet tooth row is formed in a longitudinal direction, and an elastic engagement piece fixed to the back column is engaged with the ratchet tooth row. By moving the headrest support column up and down, the ratchet teeth row moves by bending the elastic engagement piece, and when the headrest support column is stopped, the elastic engagement piece becomes the ratchet tooth. One engages the teeth of the engagement with the headrest support pillars is characterized in that so as to be locked.
[0010]
As a result, the base of the headrest support column is concealed by the back column, and there is no mechanism that protrudes from the back column or the back of the backrest.Therefore, the chair with the headrest does not lose its appearance as a chair. Even if it does not give a feeling of strangeness.
[0011]
In order to adjust the height position of the headrest by moving the headrest support post up and down, the height can be set to any height just by moving the headrest support post up and down. The adjustment operation can be easily performed.
[0012]
Claim 2 is that a row of ratchet teeth provided on the headrest support column is formed correspondingly to opposing inner edges of a vertically long window hole formed in the column, and the elastic engagement piece is The protrusion is formed on one side of a seat plate fixed to the back support side and is formed in a mountain shape elastically deformable on both side surfaces of a protruding frame that can be fitted into the window hole, and is formed in a mountain shape. In the up and down movement, the engagement piece bends and moves over the teeth of the ratchet teeth due to the bending of the engagement piece.
[0013]
This is preferable because the height of the headrest can be adjusted with a small number of parts.
[0014]
According to a third aspect of the present invention, the back column is provided on the rising portion of the back frame so as to be elastically tiltable rearward, and a back arm extending left and right is provided on both sides of the upper end, and the ends of these back arms are attached to the backrest. The headrest support post is slidably fitted in a vertically extending guide groove formed on the backrest side surface of the back support, and the cover of the headrest support post is The reason is that the backrest side is covered.
[0015]
In this way, the back strut provides cushioning when the backrest is tilted backward, and the headrest support strut is supported by this back strut. Can be a chair with good headrest.
[0016]
According to a fourth aspect of the present invention, the horizontal axis is inserted through the headrest into a bearing formed at the upper end of the headrest support column and a bearing formed in the headrest, and a friction piece is interposed between the two bearings to form the horizontal axis. The head dress is made to be rotatable by friction by tightening.
[0017]
According to this, the mounting of the headrest on the headrest support column and the adjustment of the rotation angle of the headrest can be achieved at once, the structure can be extremely simplified, and the rotation angle of the headrest can be adjusted steplessly, An easy-to-use chair can be provided.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.
[0019]
FIG. 1A shows a side view of an embodiment of a chair with a backrest provided with a headrest device according to the present invention, and FIG. 1B shows a rear view.
[0020]
The basic structure of the chair is as follows: a receiving base 4 rotatably supported by a column 2 supported by caster legs 1 and having a seat 3 at an upper portion; and a back pivotally supported by the receiving base 4 to be tiltable rearward. In this embodiment, a frame 5 and a backrest 6 are provided, and a headrest device 7 is provided on the backrest 6.
[0021]
The back frame 5 has a substantially L shape in a side view, and a portion near the front end of the back frame 5 is pivotally supported by a shaft 8 at a lower portion near a front portion of the cradle 4 so as to be tiltable rearward. The rising portion 5a is located at the center of the backrest 6 in the width direction of the back surface, and its upper end is raised to a waist position a where the human back of the backrest 6 hits.
[0022]
A back column 9 is provided above the rising portion 5a of the back frame 5.
[0023]
The back strut 9 is made of a material such as aluminum, and is attached to a waist abutment portion 10 protruding forward from an upper end of the rising portion 5a located behind the waist position a of the backrest 6. The lower end of 9 is pivotally supported by a shaft (not shown) so as to be rotatable rearward, and is provided with a cushioning property by an elastic body such as a spring or rubber.
[0024]
As shown in FIG. 1 (B), right and left back arms 11, 11 extend substantially symmetrically in the left and right portions at the upper end of the back support 9, and the left and right back arms 11, 11 are extended. The distal end is engaged so as to allow a slight movement of the left and right portions above the back plate 6a of the backrest 6 (the position corresponding to the thoracic spine).
[0025]
As this engaging means, pins (not shown) protruding from the ends of the back arms 11, 11 are inserted into pin receivers 12, 12 made of an elastic material such as rubber embedded in the back plate 6 a of the backrest 6. The pins 12 and 12 are allowed to move by deformation. However, the engaging means does not depend on the deformation of the pin receivers 12, but may have a slide structure using pins and long holes.
[0026]
As shown in FIG. 1B, the back plate 6a of the backrest 6 has an elliptical punched hole 13 which is long in the lateral direction at the waist position a, and is formed on both sides 6b, 6b of the hole 13. When the upper part of the backrest 6 is tilted backward, it is easy to bend. In this hole 13, a decorative plate 14 is stretched.
[0027]
A headrest support column 15 is slidably supported by the back column 9 in the vertical direction, and a headrest 16 is rotatably provided at an upper end of the headrest support column 15.
[0028]
That is, two guide grooves 17, 17 having a shallow arc-shaped cross section are provided in the longitudinal direction on the side surface of the back support 9 on the backrest 6 side as shown in FIG. 17, two arc-shaped cross-sectional side surfaces of the headrest support column 15 having the shape of the section “8” are slidably fitted.
[0029]
As shown in FIG. 2, a vertically long rectangular window hole 18 is formed in the vertical rod portion 15a of the headrest support column 15, and the opposite inner edges of the window hole 18 have ratchet teeth 19, 19 are formed correspondingly.
[0030]
An elastic engagement piece 20 is removably fitted in the window hole 18 with the teeth of the ratchet teeth 19, 19.
[0031]
As shown in FIG. 2 and an exploded perspective view of FIG. 3, an example of the elastic engagement piece 20 is provided on one surface of a resin seat plate 21 so as to protrude so as to fit into the window hole 18. The seat plate 21 is formed in a mountain shape on both sides of the frame 22, and is fixed to the back support 9 with set screws 23, 23. The elastic engagement piece 20 may be formed by cutting and raising a metal.
[0032]
For fixing the seat plate 21, a resin slide guide 24 fixed to the back support 9 side and a metal having a U-shaped cross section for gripping the seat plate 21 located on the opposite side to the slide guide 24 are provided. A fixing tool 25 is fixed by setscrews 23 inserted into the back support 9.
[0033]
Cutouts 26, 26 are formed at upper and lower two places on the side pieces 25a, 25a of the fixing tool 25, and claws 27, which are provided on each side edge of the seat plate 21, are formed in the cutouts 26, 26. The fixing device 25 and the seat plate 21 are integrated with each other by elastically engaging 27. Reference numeral 28 denotes a decorative cover for hiding the fixture 25.
[0034]
As a result, the engagement pieces 20, 20 of the seat plate 21 are elastically engaged with the ratchet teeth 19, 19 within the window hole 18, and when the headrest support column 15 is moved up and down, the ratchet teeth 19, 19 are formed. The teeth can be moved up and down while bending the engagement pieces 20, 20, and when the headrest support post 15 is stopped, the engagement pieces 20, 20 are engaged with one tooth and the headrest support post 15 is moved. He is restrained and does not move up and down unnecessarily.
[0035]
The headrest 16 is attached to the upper end of the headrest support column 15 so as to be rotatable by friction.
[0036]
In the illustrated embodiment, the upper end of the headrest support column 15 is formed in a bifurcated shape, and the upper ends thereof are joined by a cross beam 29. Bearings 30, 30 facing the backrest 6 at both ends of the cross beam 29 are formed. It is protruding.
[0037]
As shown in FIG. 4, a core material 31 is buried in the inner side on the back side of the headrest 16, and one side of the left and right connecting members 32, 32 forming an L shape in plan view is screwed into the core material 31. The other sides 32a, 32a of the connecting members 32, 32 serve as bearings, and polyacetal or other frictional pieces 34, 34 having a large friction coefficient are interposed in the bearings 30, 30, and bolts 35, 35 and nuts are provided. The headrest 16 can be rotated with respect to the headrest support column 15 against the frictional force of the friction pieces 34, 34. This frictional force can be arbitrarily set by adjusting the tightening torque of the bolts 35. The friction rotating means may be a combination of a Kikuza type washer and a click.
[0038]
Next, the operation of the chair of the above embodiment will be described.
[0039]
At the time of non-use while not sitting on a chair, as shown in FIG. 1 (A), the back support 9 is in an upright state by the urging of an elastic body (not shown), and accordingly, the backrest 6 is also in an upright posture.
[0040]
In this state, when the user sits on a chair and leans on the back against the backrest 6 to apply weight, the back frame 5 normally rotates backward with the shaft 8 as a fulcrum, and can take a reclining posture. At this time, the head can be tilted backward in a comfortable posture by touching the headrest 16.
[0041]
When the user leans further on the backrest 6 from the above posture to take a comfortable posture, the portion of the human body where the waist contacts (the waist position a) is supported by the waist abutment portion 10, and the upper half of the backrest 6 above it is the back. Due to the backward inclination of the support 9, the support 9 is adapted to the human body and flexed backward. At this time, the thoracic spine of the human body is supported by the left and right back arms 11, 11 of the back column 9, so that the upper half of the backrest 6 can be twisted rearward while allowing the upper half to twist to the left and right, and the most comfortable posture can be taken. it can. In addition, since the upper half of the backrest 6 follows the delicate movement of the body of the scapula of the human body due to the bending of the left and right back arms 11, 11, the tire does not feel tired.
[0042]
In the above operation, when the height position of the headrest 16 does not match the position of the head, the headrest 16 itself or the headrest support column 15 is moved upward or downward to move the headrest 16 in the window hole 18 of the headrest column 15. If the teeth of the ratchet teeth 19, 19 move while flexing the engagement pieces 20, 20, and the movement of the headrest support column 15 is stopped when reaching the optimum height position, the ratchet teeth 19, 19 at that position are stopped. The tops of the engaging pieces 20 and 20 are engaged between one of the 19 teeth, so that the vertical movement of the headrest support column 15 is restrained, and the height position of the headrest 16 can be set at the optimum position.
[0043]
When it is necessary to adjust the direction of the headrest 16, if the headrest 16 is turned, the frictional force between the bearings 30, 30 and the connecting members 32, 32 by the frictional pieces 34, 34 prevents the frictional force. It can be turned, and if stopped in the optimal direction, it is frictionally supported at that position, and is kept in a stable state without turning around.
[0044]
【The invention's effect】
As described above, according to the present invention, since the adjustment of the height position of the headrest and the adjustment of the direction of the headrest do not require any operation by a special operation member, the above-described adjustment is easy to be performed and additional As a result, it is possible to improve the operability and the appearance design of the chair at once.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a chair to which a headrest device according to the present invention is applied, (A) is a side view, and (B) is a rear view.
FIG. 2 is an exploded perspective view of a vertical movement mechanism of a headrest support column in FIG.
FIG. 3 is a perspective view showing a surface of the seat plate on an engaging portion side in FIG. 2;
FIG. 4 is a cross-sectional view showing a rotation mechanism of the headrest in FIG. 1;
FIG. 5 is an exploded perspective view of the same.
[Explanation of symbols]
Reference Signs List 3 seat portion 4 cradle 5 back frame 6 backrest 7 headrest device 9 back strut 10 waist abutment portion 11 back arm 15 headrest support strut 16 headrest 18 window hole 19 ratchet teeth 20 engaging piece 21 seat plate 30 bearing 31 core material 32 Connecting member 34 Friction piece

Claims (4)

A front end of a back frame having a substantially L-shape in side view is pivotally supported on the cradle supported by the legs so that the front end of the back frame can swing up and down, and the back frame supports the backrest. In a chair comprising, a headrest support column is supported slidably up and down on a back column of a rear rising portion of the back frame, and a headrest is attached to an upper end of the headrest support column so as to be rotatable about a horizontal axis, A ratchet tooth row is formed in the headrest support column in the longitudinal direction, and an elastic engagement piece fixed to the back column is engaged with the ratchet tooth row, and the ratchet is moved by moving the headrest support column up and down. When the dentition deflects the elastic engaging piece and moves, and stops the headrest support column, the elastic engaging piece engages with one tooth of the ratchet dentition to support the headrest. Chair headrest apparatus characterized by pillars have to be locked. The ratchet teeth provided on the headrest support column are formed correspondingly to opposing inner edges of a vertically long window hole formed in the column, and the elastic engagement pieces are provided on the back column side. A protrusion is provided on one surface of the seat plate to be fixed, and is formed in a mountain shape which is elastically deformable on both side surfaces of a projecting frame which can be fitted into the window hole. 2. The headrest device for a chair according to claim 1, wherein the headrest device is configured to jump over teeth of the ratchet teeth by bending of the piece. The back support is provided on a rising portion of the back frame so as to be elastically tiltable rearward and has a back arm extending left and right on both sides of an upper end portion, and the ends of these back arms are positioned at the upper rear back left and right positions of the backrest. The headrest support column is slidably fitted in a vertically extending guide groove formed on the backrest side surface of the back column, and the cover covers the backrest side of the headrest support column. The headrest device for a chair according to claim 1 or 2, wherein: The headrest is formed by inserting a horizontal shaft through a bearing formed at an upper end of the headrest support column and a bearing formed on the headrest, and fastening the horizontal shaft with a friction piece interposed between the bearings. The headrest device for a chair according to any one of claims 1 to 3, wherein the headrest device is capable of rotating by friction.

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