JP4176462B2 - Chair headrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair headrest device, and more particularly to a headrest device suitable for application to an office chair.
[0002]
[Prior art]
Office chairs are tilted backwards when working on computers, etc., but it is necessary to support the head smoothly at that time.
[0003]
A headrest in a chair is generally used in an automobile seat or the like, and some office chairs are provided with a headrest (see, for example, Patent Document 1).
[0004]
The chair described in the above document is provided with a headrest support mechanism on the back surface of the upper end of the backrest, and the height of the headrest and the pivoting position in the front-rear direction can be adjusted by this support mechanism.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-314268
[Problems to be solved by the invention]
Therefore, the device described in Patent Document 1 has a structure in which a headrest support mechanism is installed on the back of the central portion of the upper side of the frame-like backrest frame surrounding the backrest. The mechanism has a protruding form, and when used as an office chair, the appearance design of the chair is significantly impaired.
[0007]
In addition, it is necessary to unlock the headrest every time the headrest height is adjusted.In addition, since it is necessary to operate with the hand behind the backrest, it is extremely difficult to finely adjust the height of the headrest while sitting down. It is difficult and not preferable in terms of operability.
[0008]
In view of this, the present invention provides a headrest device for a chair that does not make a business trip to the upper back of the backrest, does not impair the appearance of the chair, and can easily perform the height of the headrest and the forward and backward rotation operation. It was made as an issue to provide.
[0009]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a seat portion on a pedestal supported by legs and a front frame end having a substantially L shape in a side view on the pedestal. In a chair that supports the backrest on the back frame, a headrest support column is supported slidably up and down on the back column of the rear raised portion of the back frame, and the headrest is placed horizontally on the upper end of the headrest support column. Attached to the headrest support strut so as to be capable of frictional rotation about an axis, a ratchet dentition is formed in the longitudinal direction on the headrest support strut, and an elastic engagement piece fixed to the back strut is meshed with the ratchet dentition, When the headrest support column is moved up and down, the ratchet teeth row is moved by bending the elastic engagement piece, and when the headrest support column is stopped, the elastic engagement piece is moved into the ratchet teeth. 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 becomes a form concealed by the back column, and there is no mechanism protruding on the back of the back column or backrest, so the appearance as a chair is not impaired, and the chair with the headrest Even so, there is no sense of incongruity.
[0011]
To adjust the height of the headrest by moving the headrest support column up and down, it can be set to any height simply by moving the headrest support column up and down. Adjustment operation can be easily performed.
[0012]
The ratchet dentition provided on the headrest support column is formed corresponding to the opposite inner edges of the vertically long window holes formed on the column, and the elastic engagement piece is formed on the back column. It is formed in a mountain shape projecting on one side of a seat plate fixed to the side and formed elastically deformable on both side surfaces of a projecting frame that can be fitted into the window hole, and when the headrest support column moves up and down The bending of the engagement piece jumps over the teeth of the ratchet dentition.
[0013]
This is preferable because the height of the headrest can be adjusted with a small number of parts.
[0014]
Further, the back strut is provided elastically on the rising portion of the back frame so that it can be tilted rearwardly, and back arms extending left and right are provided on both sides of the upper end portion, and the tips of the back arms are arranged above the backrest. The headrest support strut is slidably fitted in a guide groove extending in the vertical direction formed on the backrest side surface of the back strut, and the backrest side of the headrest support strut is covered by the cover. It is because it was made to encapsulate.
[0015]
In this way, the back strut provides cushioning when the backrest is tilted, and the headrest support strut is supported by this back strut, so that the headrest can be tilted backwards smoothly and comfortably. It can be a chair with a good headrest.
[0016]
Further , the horizontal axis is inserted into a bearing formed on the upper end of the headrest supporting column and a bearing formed on the headrest, and the horizontal axis is fastened by interposing a friction piece between the bearings. Thus, the head dress can be rotated by friction.
[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 swung and the rotation angle of the headrest can be adjusted steplessly, It can be an easy-to-use chair.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to 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 structure of the chair is as follows. A pedestal 4 that is rotatably supported by a column 2 supported by a leg 1 with casters and that has a seat 3 at the top, and a back that is pivotally supported by the pedestal 4 so as to be tilted rearward. The frame 5 and the backrest 6 are provided, and the headrest device 7 is provided on the backrest 6 portion.
[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 the front portion of the cradle 4 so as to be tiltable rearward. The rising portion 5a is positioned at the center of the backrest 6 in the width direction of the back surface, and the upper end of the rising portion 5a 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 raised portion 5a of the back frame 5.
[0023]
The back strut 9 is made of a material such as aluminum, and the back strut 9 protrudes forward from the upper end of the rising portion 5a located behind the waist position a of the backrest 6 to the back strut contact portion 10. The lower end of 9 is pivotally supported by a shaft (not shown) so as to be rotated rearward, and cushioning is given by an elastic body such as a spring or rubber.
[0024]
As shown in FIG. 1B, left and right dorsal arms 11 and 11 are extended symmetrically in a substantially horizontal direction on the left and right portions of the upper end of the back column 9. The tip is engaged so as to allow a slight movement of the left and right portions of the back plate 6a of the backrest 6 above the position (corresponding to the thoracic vertebra).
[0025]
As the engaging means, a pin (not shown) protruding from the tip of the back arm 11, 11 is inserted into a pin holder 12, 12 made of an elastic material such as rubber embedded in the back plate 6 a of the backrest 6. The movement of the pin receivers 12 and 12 is allowed by the deformation. However, the engaging means is not based on the deformation of the pin receivers 12 and 12, but may be a slide structure including a pin and a long hole.
[0026]
As shown in FIG. 1B, the back plate 6a of the backrest 6 is formed with an elliptical punching hole 13 that is long in the lateral direction at the waist 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]
A headrest support column 15 is supported by the back column 9 so as to be slidable in the vertical direction, and a headrest 16 is rotatably provided at the upper end of the headrest support column 15.
[0028]
That is, two guide grooves 17 and 17 having a shallow arcuate cross section as shown in FIG. 4 are provided on the side surface on the backrest 6 side of the back support column 9 in the vertical direction. 17, two cross-section arc-shaped side surfaces of the headrest support column 15 having a cross-section “8” shape are slidably fitted.
[0029]
Further, as shown in FIG. 2, a vertical rectangular window hole 18 is formed in the vertical flange portion 15 a of the headrest support column 15, and a Latette tooth row 19, 19 are formed corresponding to each other.
[0030]
In the window hole 18, an elastic engagement piece 20 is detachably fitted to the teeth of the ratchet teeth rows 19 and 19.
[0031]
The elastic engagement piece 20 is a protrusion protruding so as to fit into the window hole 18 on one surface of a resin seat plate 21 as shown in a perspective view in FIG. The seat plate 21 is fixed to the back column 9 with set screws 23 and 23 on both sides of the frame 22. The elastic engagement piece 20 may be a metal cut and raised.
[0032]
For fixing the seat plate 21, a resin-made slide guide 24 fixed to the back column 9 side and a metal having a U-shaped cross section that holds the seat plate 21 located on the opposite side of the slide guide 24. A fixing tool 25 made of metal is fixed by set screws 23, 23 inserted through the back column 9.
[0033]
The side pieces 25a, 25a of the fixture 25 are formed with cut holes 26, 26 at two positions, upper and lower, and claws 27, 26 projecting from the cut edges 26, 26 on the respective side edges of the seat plate 21, 27 is elastically engaged and the fixture 25 and the seat plate 21 are integrated. Reference numeral 28 denotes a decorative cover that hides the fixing member 25.
[0034]
Thus, the engagement pieces 20 and 20 of the seat plate 21 are elastically engaged with the ratchet teeth 19 and 19 in the window hole 18, and when the headrest support column 15 is moved up and down, the ratchet teeth 19 and 19 are engaged. The teeth can be moved in the vertical direction while bending the engagement pieces 20, 20. When the headrest support column 15 is stopped, the engagement pieces 20, 20 are engaged with one tooth and the headrest support column 15 is It is restrained and does not move up and down due to paranoia.
[0035]
The headrest 16 is attached to the upper end of the headrest support column 15 so that frictional rotation is possible.
[0036]
In the illustrated embodiment, the upper end of the headrest support column 15 is formed in a bifurcated shape, and the upper end is connected by a horizontal beam 29, and the bearings 30, 30 face the backrest 6 side at both ends of the horizontal beam 29. Projected.
[0037]
As shown in FIG. 4, a core member 31 is embedded in the inner lateral direction on the back side of the headrest 16, and one side of the left and right connecting members 32, 32 having an L shape in plan view is formed on the core member 31 by screws 33, 33. The other sides 32a and 32a of the connecting members 32 and 32 serve as bearings, and bolts 35 and 35 and nuts are interposed in the bearings 30 and 30 with polyacetal and other frictional pieces 34 and 34 having a large friction coefficient. The headrest 16 can be rotated with respect to the headrest support column 15 against the frictional force of the frictional pieces 34, 34. 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 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 not sitting on the chair, as shown in FIG. 1 (A), the back column 9 is put up by an urging force of an elastic body (not shown), and the backrest 6 is also put up in a standing posture.
[0040]
When sitting on a chair from this state and leaning back against the backrest 6 and applying weight, the back frame 5 usually 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 an easy posture by being applied to the headrest 16.
[0041]
When leaning further toward the backrest 6 from the above posture and taking an easy posture, the portion of the human body that the waist is in contact with (the waist position a) is supported by the waist contact portion 10, and the upper half of the backrest 6 above it is the back The column 9 bends backwards in conformity with the human body by tilting backward. At this time, the human thoracic vertebra is supported by the left and right dorsal arms 11 and 11 of the back support column 9, so that the upper half of the backrest 6 can be twisted to the left and right while tilting backwards to take the most comfortable posture. it can. In addition, since the upper half of the backrest 6 follows subtle body movements due to the flexure of the left and right back arms 11, 11, the scapula portion of the human body does not feel tired.
[0042]
In the above operation, when the height of the headrest 16 does not match the position of the head, if the headrest 16 itself or the headrest support column 15 is held and moved upward or downward, the headrest 16 in the window hole 18 of the headrest support column 15 If the teeth of the ratchet teeth row 19 and 19 move while bending the engaging pieces 20 and 20 and reach the optimum height position, the movement of the headrest support column 15 is stopped, and the ratchet row 19 and 19 at that position are stopped. The top portions of the engagement pieces 20 and 20 are engaged between one tooth 19 and the vertical movement of the headrest support column 15 is restrained, so that the height position of the headrest 16 can be set at the optimum position.
[0043]
Further, when it is necessary to adjust the direction of the headrest 16, if the headrest 16 is rotated, the friction force caused by the frictional pieces 34, 34 between the bearings 30, 30 and the connecting members 32, 32 is resisted. If it can be turned and stopped in an optimal orientation, it will be frictionally supported at that position, and will be held in a stable state without turning around.
[0044]
【The invention's effect】
As described above, according to the present invention, 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. Therefore, 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, in which (A) is a side view and (B) is a rear view.
2 is an exploded perspective view of a vertical movement mechanism of the headrest support column in FIG. 1. FIG.
3 is a perspective view showing a surface on the engaging portion side of the seat plate in FIG. 2. FIG.
4 is a cross-sectional view showing a rotation mechanism of the headrest in FIG. 1. FIG.
FIG. 5 is an exploded perspective view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Seat part 4 Receptacle 5 Back frame 6 Backrest 7 Headrest apparatus 9 Back support | pillar 10 Lumbar contact part 11 Back arm 15 Headrest support support | pillar 16 Headrest 18 Window hole 19 Lattiet tooth row 20 Engagement piece 21 Seat plate 30 Bearing 31 Core material 32 Connecting member 34 Friction part

Claims (3)

The seat has a seat on the pedestal supported by the legs, and the front end of the back frame having a substantially L shape in side view is pivotally supported on the cradle so as to be swingable in the vertical direction, and the back frame is supported by the back frame. In the chair
A headrest support column is supported on the back column of the rear raised portion of the back frame so that the headrest can be slid up and down. Is formed by forming a ratchet dentition in the vertical direction, and an elastic engagement piece fixed to the back strut is meshed with the ratchet dentition, and the headrest support strut is moved up and down so that the ratchet dentition is elastic. Go by bending the engaging piece, the headrest resilient engaging piece when the support posts is stopped is engaged with one tooth of the ratchet teeth to lock the headrest support pillars the headrest support to the back post So that the column is fixed in position ,
The ratchet dentition provided on the headrest support column is formed corresponding to the opposite inner edges of the vertically long window hole formed on the column, and the elastic engagement piece is formed on the back column side. Projecting on one surface of the fixed seat plate, it is formed in a mountain shape that can be elastically deformed on both side surfaces of the projecting frame that can be fitted into the window hole, and the engagement is made when the headrest support column moves up and down. It is designed to jump over the teeth of the ratchet dentition due to bending of the piece,
The elastic engagement piece can be fixed to the back strut with a set screw penetrating the window hole, and the headrest support post can be fixed to the back strut with a set screw. It is supported by the back strut by meshing with a row,
The headrest device of a chair , wherein the headrest support column is slidably fitted in a guide groove extending in a vertical direction formed on a backrest side surface of the back column .   The back strut is provided with a back arm that is elastically rearwardly tiltable at the rising portion of the back frame and extends to the left and right on both sides of the upper end, and the tip of the back arm is located at the left and right positions on the back of the upper portion of the backrest. The headrest device for a chair according to claim 1, wherein the backrest side of the headrest support column is encapsulated by the cover.   The headrest is formed by inserting a horizontal axis through a bearing formed at the upper end of the headrest support column and a bearing formed at the headrest, and fastening the horizontal axis with a friction piece between the two bearings. The headrest device for a chair according to any one of claims 1 to 2, wherein frictional rotation is possible.

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