Headrest device of chair

【0001】

[Technical field to which the invention belongs]

The present invention relates to a chair headrest device, and particularly relates to a headrest device suitable for application to office chairs.

【0002】

[Conventional technology]

Office chairs take a backward leaning posture when working on a computer, but at that time it is necessary to smoothly support the head.

【0003】

Headrests in chairs are generally used in automobile seats and the like, and some office chairs are also provided with headrests (see, for example, Patent Document 1).

【0004】

In the chair described in the above document, a headrest support mechanism is attached to the back surface of the upper end portion of the backrest, and the height position and the front-back rotation position of the headrest can be adjusted by this support mechanism.

【0005】

[Patent Document 1]

Japanese Unexamined Patent Publication No. 2001-314268 [0006]

[Problems to be Solved by the Invention]

Therefore, the one described in Patent Document 1 has a structure in which a headrest support mechanism is installed on the back surface of the central portion of the upper lateral rod of the frame-shaped backrest frame that surrounds the periphery of the backrest, and therefore the support is provided on the upper back surface of the backrest. The mechanism is in a protruding form, and when it is used as an office chair, the appearance design as a chair is significantly impaired.

【0007】

In addition, it is extremely difficult to finely adjust the height position of the headrest while sitting because it is necessary to unlock each time the height position of the headrest is adjusted and the hand must be placed on the back side of the backrest to operate it. It is difficult and 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 surface of the backrest, does not impair the appearance of the chair, and facilitates the height of the headrest and the back-and-forth rotation operation. It was made with the task of providing it.

【0009】

[Means for solving problems]

As a means for solving the above problems, the present invention has a seat on a pedestal supported by legs, and the front end of a back frame having a substantially L-shaped side view on the pedestal can swing vertically. In a chair that supports and supports the backrest on the back frame, the headrest support column is slidably supported on the back column of the rear rising portion of the back frame, and the headrest is laterally supported on the upper end of the headrest support column. It is attached so as to be frictionally rotatable around a shaft, a ratchet dentition is formed in the vertical direction on the headrest support strut, and an elastic engaging piece fixed to the back strut is meshed with the ratchet dentition. By moving the headrest support strut up and down, the ratchet dentition flexes and moves the elastic engaging piece, and when the headrest support strut is stopped, the elastic engaging piece engages with one tooth of the ratchet dentition. The headrest support column is 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, so that the appearance as a chair is not spoiled and the chair with the headrest is provided. Even so, it does not give a sense of discomfort.

【0011】

In addition, to adjust the height position of the headrest by moving the headrest support support up and down, you can set it to any height simply by moving the headrest support support up and down, and even if you are sitting in a chair, you can set it to any height with one hand. The adjustment operation can be easily performed.

【0012】

According to claim 2, the lattice dentition provided on the headrest support strut is formed corresponding to the opposite inner edges of the vertically elongated window holes formed in the strut, and the elastic engaging piece is formed. The headrest support column is formed in a mountain shape that is elastically deformable on both side surfaces of a projecting frame that is projected from one surface of a seat plate fixed to the back column side and can be fitted into the window hole. It is because the teeth of the ratchet dentition are jumped over and moved by the bending of the engaging piece when moving up and down.

【0013】

This is preferable because the height of the headrest can be adjusted with a small number of parts.

【0014】

According to claim 3, the back strut is provided on the rising portion of the back frame so as to be elastically tiltable backward, and back arms extending to the left and right are provided on both sides of the upper end portion, and the tips of these back arms are provided on the backrest. The headrest support strut is slidably fitted into a guide groove extending in the vertical direction formed on the backrest side surface of the back strut, and the headrest support strut is covered with a cover. The backrest side is covered.

【0015】

In this way, the back support provides cushioning when the backrest is tilted backward, and the headrest support support is supported by the back support, so that the headrest can be tilted backward flexibly, which makes it comfortable to sit on. It can be a chair with a good headrest.

【0016】

According to claim 4, the horizontal axis is inserted through the bearing formed at the upper end of the headrest support column and the bearing formed on the headrest, and the horizontal axis is interposed between the bearings with a friction portion piece. By tightening, the headrest can be frictionally rotated.

【0017】

According to this, the attachment of the headrest to the headrest support column and the adjustment of the rotation angle of the headrest can be achieved at once, the structure can be easily made, and the rotation angle of the headrest can be adjusted steplessly. It can be an easy-to-use chair.

【0018】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

【0019】

FIG. 1 (A) 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. 1 (B) shows a rear view.

【0020】

The basic configuration of the chair is a pedestal 4 that is rotatably supported by a support 2 supported by legs 1 with casters and has a seat 3 at the top, and a back that is pivotally supported by the pedestal 4 so as to be tilted backward. A frame 5 and a backrest 6 are provided, and a headrest device 7 is provided on the backrest 6 portion.

【0021】

The back frame 5 has a substantially L-shaped side view, and the vicinity of the front end of the back frame 5 is pivotally supported by a shaft 8 at the lower part near the front of the pedestal 4 so as to be tilted backward. 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 the lumbar position a where the human body waist of the backrest 6 hits.

【0022】

A back support 9 is provided above the rising portion 5a of the back frame 5.

【0023】

The back support 9 is made of a material such as aluminum, and the back support is formed on a waist contact portion 10 that projects forward from the upper end of the riser 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 cushioning is provided by an elastic body such as a spring or rubber.

【0024】

As seen in FIG. 1 (B), the left and right back arms 11 and 11 extend symmetrically in the substantially horizontal direction on the left and right portions of the upper end of the back support 9, and these back arms 11 and 11 The tip is interlocked so as to allow slight movement of the left and right parts of the backrest 6 above the back plate 6a (the position corresponding to the thoracic spine).

【0025】

As this fastening means, a pin (not shown) protruding from the tip of the back arms 11 and 11 is inserted into the pin receivers 12 and 12 made of elastic material such as rubber embedded in the back plate 6a of the backrest 6. , The deformation of the pin receivers 12 and 12 allows movement. However, this engaging means is not due to the deformation of the pin receivers 12 and 12, but may be a slide structure consisting of a pin and an elongated hole.

【0026】

As seen in FIG. 1 (B), the back plate 6a of the backrest 6 is formed with an elliptical punched hole 13 that is long in the lateral direction at the lumbar position a, and both side portions 6b and 6b of the hole 13 are formed. It is easy to bend when the upper part of the backrest 6 is tilted backward. A decorative plate 14 is stretched in the hole 13.

【0027】

The headrest support column 15 is slidably supported in the vertical direction on the back column 9, and the headrest 16 is rotatably provided on the upper end of the headrest support column 15.

【0028】

That is, two guide grooves 17 and 17 having a shallow arc-shaped cross section are provided in the vertical direction on the side surface of the back support 9 on the backrest 6 side as shown in FIG. 4, and the guide grooves 17 and 17 are provided. Two arcuate side surfaces of the headrest support column 15 having a cross section "8" are slidably fitted to 17.

【0029】

Further, as shown in FIG. 2, a vertically long rectangular window hole 18 is provided in the vertical rod portion 15a of the headrest support support column 15, and the lattice dentition 19, 19 are formed correspondingly.

【0030】

In the window hole 18, the elastic engaging piece 20 is detachably fitted to the teeth of the ratchet dentitions 19 and 19.

【0031】

An example of the elastic engagement piece 20 is disassembled into FIG. 2, and as shown in a perspective view in FIG. 3, a protrusion is provided on one surface of a resin seat plate 21 so as to be fitted into the window hole 18. A mountain shape is formed on both sides of the frame 22, and the seat plate 21 is fixed to the back support 9 with set screws 23 and 23. The elastic engagement piece 20 may be made of metal.

【0032】

To fix 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 that grips the seat plate 21 located on the opposite side of the slide guide 24. The fixture 25 made of metal is fixed by the set screws 23 and 23 that are inserted into the back support 9.

【0033】

The side pieces 25a and 25a of the fixture 25 are formed with cut holes 26, 26 at two upper and lower positions, and the claws 27, which are projected from the side edges of the seat plate 21 in the cut holes 26, 26. 27 is elastically engaged to integrate the fixture 25 and the seat plate 21. 28 is a cosmetic cover that hides the fixture 25.

【0034】

As a result, the engaging pieces 20, 20 of the seat plate 21 are elastically engaged with the lattice dentition 19, 19 in the window hole 18, and when the headrest support column 15 is moved up and down, the lattice dentition 19, 19 The teeth can be moved in the vertical direction while bending the engaging pieces 20, 20, and when the headrest supporting column 15 is stopped, the engaging pieces 20, 20 engage with one tooth and the headrest supporting column 15 is engaged. Being restrained, he does not move up and down in a delusion.

【0035】

The headrest 16 is attached to the upper end of the headrest support column 15 so as to be frictionally rotatable.

【0036】

In the illustrated embodiment, the upper ends of the headrest support column 15 are formed in a bifurcated shape, and the upper ends thereof are connected by a cross beam 29, and the bearings 30 and 30 face the backrest 6 side at both end positions of the cross beam 29. It is thrust.

【0037】

As shown in FIG. 4, a core material 31 is embedded in the inner lateral direction of the back side of the headrest 16, and one side of the left and right connecting members 32, 32 forming an L shape in a plan view is formed by screws 33, 33 in the core material 31. It is fixed, and the other sides 32a, 32a of the connecting members 32, 32 serve as bearings, and the bolts 35, 35 and nuts are interposed between the bearings 30, 30 with polyacetal and other friction part pieces 34, 34 with a large friction coefficient. It is fastened with 36 and 36 so that the headrest 16 can be rotated against the frictional force of the friction portion pieces 34 and 34 with respect to the headrest support column 15. This frictional force can be arbitrarily set by adjusting the tightening torque of the bolts 35 and 35. The friction rotating means may be a combination of a Kikuza-shaped washer and a click.

【0038】

Next, the operation of the chair of the above embodiment will be described.

【0039】

When not in use without sitting on a chair, as shown in FIG. 1 (A), the back support 9 is placed in an upright position due to the urging of an elastic body (not shown), and the backrest 6 is also placed in an upright position accordingly.

【0040】

If you sit on a chair from this state and lean your back against the backrest 6 to put your weight on it, the back frame 5 normally tilts backward with the axis 8 as the fulcrum, and you can take a reclining posture. At this time, the head can be tilted backward in a comfortable posture by hitting the headrest 16.

【0041】

When the human body leans further on the backrest 6 from the above posture and takes a comfortable posture, the part where the lumbar region of the human body hits (lumbar position a) is supported by the lumbar contact portion 10, and the upper half of the backrest 6 above it is the back. By tilting the support column 9 backward, it adapts to the human body and bends backward. At this time, the thoracic vertebrae of the human body are supported by the left and right back arms 11 and 11 of the back support 9, so it is possible to lean backward while allowing the upper half of the backrest 6 to twist to the left and right, and take the most comfortable posture. it can. In addition, the upper half of the backrest 6 follows the delicate movements of the body due to the bending of the left and right back arms 11 and 11 on the shoulder blades of the human body, so that the person 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, when the headrest 16 itself or the headrest support column 15 is held and moved upward or downward, the headrest support column 15 is inside the window hole 18. When the teeth of the ratchet dentition 19, 19 move while bending the engaging pieces 20, 20, and when the optimum height position is reached, if the movement of the headrest support strut 15 is stopped, the ratchet dentition 19, The tops of the engaging pieces 20 and 20 are engaged between one tooth of 19, and the vertical movement of the headrest support column 15 is restricted, so that the height position of the headrest 16 can be set to the optimum position.

【0043】

When it is necessary to adjust the orientation of the headrest 16, the headrest 16 can be turned to resist the frictional force of the friction pieces 34,34 between the bearings 30, 30 and the connecting members 32, 32. It can be turned, and if it is stopped in the optimum direction, it will be frictionally supported at that position and will be maintained in a stable state without turning in a delusion.

【0044】

[Effect of the invention]

As described above, according to the present invention, the adjustment of the height position of the headrest and the adjustment of the orientation of the headrest do not require any operation by a special operating member. The various operating members do not protrude or be exposed on the appearance of the chair, which makes it possible to improve the operability and the appearance design of the chair at once.

[Simple explanation of drawings]

FIG. 1 shows an embodiment of a chair to which the headrest device according to the present invention is applied, (A) is a side view, and (B) is a rear view.

2 is an exploded perspective view of the vertical movement mechanism of the headrest support column in FIG. 1. FIG.

3 is a perspective view showing a surface of the seat plate on the engaging portion side in FIG. 2. FIG.

4 is a cross-sectional view showing the rotation mechanism of the headrest in FIG. 1. FIG.

FIG. 5 is an exploded perspective view of the same.

[Explanation of symbols]

3 Seat 4 Cradle 5 Back frame 6 Backrest 7 Headrest device 9 Back strut 10 Lumbar contact 11 Back arm 15 Headrest support strut 16 Headrest 18 Window hole 19 Ratchet dentition 20 Engagement piece 21 Seat plate 30 Bearing 31 Core material 32 Connecting member 34 Friction piece