JP4102613B2 - Chair headrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a headrest device for a chair, and in particular, to an attachment structure for attaching a headrest to an upper end portion of a pillow support rod that stands up from an upper portion of a backrest so that the headrest can swing in the vertical direction.
[0002]
[Prior art]
As a conventional device of this type, the headrest is pivotally attached to the upper end of the pillow support rod that stands up from the upper part of the backrest with a shaft that faces in the left-right direction, and the headrest can be rotated by a spring or the like around this shaft. A device provided with a means for imparting resistance is common.
[0003]
[Problems to be solved by the invention]
However, in the conventional apparatus as described above, there is a problem that the structure of the resistance applying means is complicated, the shaft attaching work is complicated, and it takes time to assemble.
[0004]
In view of the above-mentioned problems of the conventional technology, the present invention can easily and quickly attach the headrest to the pillow support rod without performing the pivoting operation, and the structure is simple and manufactured at low cost. An object of the present invention is to provide a headrest device for a chair that can be used.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A pillow-shaped pillow receiving surface that protrudes forward is provided on the front surface of the upper end of the pillow support rod that stands up from the top of the backrest, and a headed shaft having a widened head at the front end. And projecting so as to face the direction of the normal line of the pillow receiving surface, and on the rear surface of the rear shell in the headrest, a side-view concave arc-shaped fitting surface having substantially the same curvature as the pillow receiving surface is provided, and A long hole facing in the vertical direction through which the shaft portion of the headed shaft can be inserted is fitted, the fitting surface is fitted to the pillow receiving surface so as to be slidable in the vertical direction, and the shaft portion of the headed shaft is fitted in the long hole The headrest can be swung up and down along the pillow receiving surface by pressing the widened head of the headed shaft against the front side of the rear shell, and on the front of the upper end of the pillow support rod. Installing.
[0006]
(2) In the above paragraph (1), an arc having a center of curvature substantially the same as the pillow receiving surface is formed between the widened head of the headed shaft and the front surface of the rear shell of the headrest, and the upper and lower ends A leaf spring material is provided in which the portion is locked to the rear shell, and the middle portion is elastically bent in the front-rear direction, and the widened head portion of the headed shaft is friction-welded to the front surface of the leaf spring material.
[0007]
(3) In the above item (2), a plurality of recesses that allow the widened head portion of the headed shaft to engage with the front surface of the leaf spring material are provided at appropriate intervals in the vertical direction.
[0008]
(4) In the above item (2) or (3), the front surface of the leaf spring material is a corrugated surface continuous in the vertical direction.
[0009]
(5) In any one of the above items (1) to (4), the upper end portion of the pillow support rod is bifurcated in the left-right direction, and a pillow receiving surface and a headed shaft are provided at the upper end portion of each branch portion. Correspondingly, a pair of fitting surfaces and long holes are provided on the rear surface of the rear shell of the headrest, one on each side.
[0010]
(6) In the above item (5), the left and right branch portions can be elastically bent toward each other inward, and the left and right branch portions are inwardly connected to the opposing edges of the left and right elongated holes in the rear shell of the headrest. A pair of left and right enlarged holes that can be inserted through the widened heads of the left and right headed shafts by being elastically bent toward each other are continuously arranged so as to face each other through the narrow width part. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 11 show a chair provided with an embodiment of the present invention.
[0012]
As shown in FIGS. 1 to 3, the chair can be tilted backward in conjunction with the seat (3) and the backrest (4) on the support base (2) supported by the legs (1). It is installed.
[0013]
The backrest (4) is a left-right 1 in the shape of an L-shaped side view in which the front end of the horizontal portion (6a) (6a) facing forward is pivotally attached to the support base (2) with a shaft (5) pointing in the left-right direction. The pair of backrest support rods (6) and (6) and the upper ends of the upright portions (6b) and (6b) that stand up from the rear ends of the horizontal portions (6a) and (6a) of the backrest support rods (6) and (6) Net material that attaches to the back of the seated person directly, and is attached to the upper and lower parts of the upper frame (7) facing the left and right sides and the upright and lower parts of the backrest support rods (6) and (6). It consists of the backrest member (8) which consists of.
[0014]
The backrest (4) may be configured such that the backrest support ridges (6) and (6) and the upper frame (7) are integrally embedded in the thick backrest member (8).
[0015]
In this embodiment, the headrest device (9) is attached to the upper frame (7) in the backrest (4).
The headrest device (9) is pivotally attached to the upper frame (7) so that the angle of the lower end can be adjusted around the axis facing the left and right direction, and can extend and contract in the longitudinal direction. The headrest (11) is pivotally attached to the upper end of the head so that the angle of the headrest (11) can be adjusted around the axis in the left-right direction.
[0016]
As shown in FIGS. 4 to 8, the pillow support rod (10) has a lower end pivotally attached to the upper frame (7), faces substantially upward, and has a vertical rectangular opening (12) on the front surface (side surface). The provided support cylinder (13) having a substantially triangular shape in plan view, and fitted into the support cylinder (13) so as to be slidable from above, and a headrest support portion (14) is formed at the upper end, A lifting / lowering rod (16) having a plurality of concave grooves (15) facing in the left-right direction as the engaged portion on the surface facing the opening (12), and the opening (12) are closed. The lifting rod (16) is detachably provided on the front surface of the support cylinder (13) and selectively elastically engages with the plurality of concave grooves (15) of the lifting rod (16), so that the lifting rod (16) can be A closing member (18) having a round bar-like protrusion (17) facing in the left-right direction, which is an elastically deformable engaging portion that can be held at a height.
[0017]
The lower end portion of the support tube (13) branches in an inverted V-shaped bifurcated shape in the left-right direction, and the lower end portion of both branch portions (19) (19) has a tube portion (20) facing in the left-right direction. (20) is provided.
[0018]
Each cylinder part (20) has a shaft (right and left) on the inner surface of a pair of left and right support members (support parts) (22) and (22) fixed to the upper frame (7) with a set screw (21). 23) is pivotally attached.
[0019]
As shown in FIG. 4, the shaft (23) has male screw portions (25) and (26) on both sides of the enlarged diameter flange portion (24), and the outer periphery of the base portion of the longer male screw portion (26). It is formed by a barbed bolt in which a pair of planing surfaces (27) for hanging a spanner are formed on the surface.
[0020]
One male screw portion (25) passes through the support member (22) and is tightened with a cap nut (28) that is screwed into the tip portion thereof, whereby the other male screw portion (26) is attached to the support member (22). Are fixed so that they face each other inward.
[0021]
The other male screw portion (26) is inserted with a central hole (30) of an inward flange portion (29) provided in an intermediate portion of the inner surface of the left and right tube portions (20), and an enlarged diameter flange portion ( 24) and the inward flange portion (29), and between the inward flange portion (29) and the cap nut (31) which is a fastening means screwed into the male screw portion (26). By tightening the cap nut (31) by interposing resistance applying means (34) comprising one or more disc springs (32) and one or more friction plates (33), A required resistance force can be applied to the rotation of the support cylinder (13) around the axis (23). This resistance force can be adjusted by adjusting the tightening amount of the cap nut (31).
[0022]
In the example shown in FIG. 4, the resistance applying means (34) outside the inward flange portion (29) of the cylindrical portion (20) is composed of one disc spring (32) and three friction plates (33 And the resistance applying means (34) inside the inward flange (29) is composed of two disc springs (32) and two friction plates (33). is there.
[0023]
The eccentric portion on the inner side surface of each support member (22) is integrally formed with a convex portion (35) that is arcuate in side view and protrudes in parallel with the shaft (23), and a cylindrical portion (20 ) Is provided with an arc-shaped recess (36) having a circumferential length larger than the length in the same direction of the projection (35), and the recess (36) is provided with the projection (35). By fitting, the rotation angle of the support cylinder (13) around the axis (23) can be regulated within a required range.
[0024]
The convex portion (35) may be provided on the cylindrical portion (20) side, and the concave portion (36) may be provided on the support member (22) side.
[0025]
As shown in FIG. 5 to FIG. 8, the support cylinder (13) has a cross-sectional shape in the center of the rear portion, which is provided with an apex portion that widens in a V shape in plan view with a depression angle of 90 ° toward the front. The lifting rod (16) is formed in a shape that is substantially complementary to the front surface of the rear portion of the support cylinder (13). 13) It can be moved up and down smoothly without any twist.
[0026]
On the front surface at the center of the rear part of the support tube (13), a groove (37) is provided in the vertical direction extending from the lower end to a position slightly below the upper end, and on the lower end rear part of the corresponding lifting rod (16). Is normally fitted into the groove (37) and when the elevating rod (16) is raised to a predetermined position, it engages with the upper end of the groove (37), and the elevating rod (16) An outward engaging claw (38) is provided so as to prevent further upward movement.
[0027]
The engaging claw (38) is integrally formed with the lifting rod (16) so that it can be elastically deformed toward the inside of the lifting rod (16), thereby elastically deforming it. The elevating rod (16) can be pulled out from the support tube (13) or inserted in reverse.
[0028]
When removing the lifting rod (16) from the support tube (13), remove the closing member (18) from the opening (12), insert a finger into the opening (12), and engage the upper end of the groove (37). Engaging engagement claws can be elastically bent inward to easily release the engagement.
[0029]
The closing member (18) has a vertically long rectangular plate shape, the lower end of which is inserted inside the lower edge of the opening (12) on the front surface of the support tube (13), and the boss provided at the upper end. A set screw (41) fitted to a projecting shaft (40) projecting from the top of the opening (12) on the front surface of the support tube (13) and secured to the front end of the projecting shaft (40) The boss portion (39) is prevented from slipping off the projecting shaft (40) by the head portion (41a) of the left and right sides, and a pair of left and right outward locking claws (42) extending rearward from both sides of the middle portion. ) Are fitted and locked in engagement grooves (43) provided on both side surfaces of the middle portion of the opening (12) in the support cylinder (13), thereby opening the opening (12) on the front surface of the support cylinder (13). It is attached so as to block.
[0030]
At the center of the closing member (18), two parallel slits (44) (44) facing the vertical direction are provided, and a flexible piece (45) is formed between the slits (44) (44). Has been.
[0031]
At the upper end of the flexible piece (45), a thin flexible bending piece (46) is provided, and on the upper rear surface of the flexible piece (45) just below the flexible piece (45), ) Protrudes rearward.
[0032]
When the flexible piece (45) is elastically bent forward, the protrusion (17) is selectively elastically engaged with the plurality of concave grooves (15) of the elevating rod (16), and the elevating rod ( 16) can be maintained in a stepwise desired height.
[0033]
As shown in FIGS. 5 and 9 to 11, the upper end portion of the lifting / lowering rod (16) is formed in a bifurcated V-shape that opens in the left-right direction and faces forward by using an elastic synthetic resin material. At the front end of (47), there is formed a headrest support portion (14) comprising a short lateral shaft portion (48) and a headed shaft (49) projecting from the front center thereof.
[0034]
The front surface of the lateral shaft portion (48) forms a pillow-shaped receiving surface (48a) that is convex in a side view and protrudes forward.
[0035]
The headed shaft (49) has a shaft portion (49a) protruding so as to face the direction of the normal line of the pillow receiving surface (48a), and a disk-shaped widened head provided at the front end ( 49b) and hemispherical or semi-cylindrical protrusions (49c) facing left and right provided on the rear surfaces of the left and right sides of the widened head (49b). In this example, the widened head (49b) has a disk shape, but may have a rectangular plate shape that is long in the left-right direction or other shapes.
[0036]
The headrest (11) has a front shell (53) of approximately the same shape with a cushioning material (51) and a cover material (52) attached to the front surface of the rear shell (50) of an inverted isosceles triangle shape. The rear shell (50) has a pair of left and right mating surfaces (54, 54) that are concavely arcuate in side view and have the same curvature as the pillow receiving surface (48a). And a pair of left and right elongated holes (55) that can be inserted into the shaft portion (49a) of the headed shaft (49) in each fitting surface (54), and each elongated hole (55 ) Is provided with an enlarged hole (57) continuously provided so as to face inward through a narrow width portion (56), at an intermediate portion (or upper and lower end portions) of the opposite edge of.
[0037]
The distance between the left and right elongated holes (55) and (55) is the same as the distance between the left and right headed shafts (49) and (49) when no external force is applied, and the position and size of each enlarged hole (57). Sato means that the left and right bifurcated portions (47) and (47) at the upper end of the elevating rod (16) are elastically bent toward each other inwardly, thereby widening the heads (49b) of the left and right headed shafts (49). ) Are inserted into the corresponding enlarged holes (57) at the same time or one of them first, and the shaft portion (49a) is positioned in the elongated hole (55) through the narrow width portion (56). The relationship is such that it can be inserted sequentially.
[0038]
Therefore, using the left and right enlarged holes (57) (57), the shaft portions (49a) (49a) of the left and right headed shafts (49), (49), the widened heads (49b), (49b) of the front end thereof ) Is positioned in front of the rear shell (50) so that it fits in the left and right oblong holes (55) (55) of the rear shell (50) and the left and right rear shells (50) The mating surfaces (54) and (54) are fitted to the left and right pillow receiving surfaces (48a) and (48a), and the rear shell (50) and the headrest (11) integrated therewith are connected to the upper end of the lifting / lowering rod (16). The headrest support portion (14) can be easily mounted so as to swing in the vertical direction about the lateral shaft portions (48) (48).
[0039]
Between the both sides of the widened head (49b) of the headed shaft (49) and the front surface of the rear shell (50), there is an arc shape with the same center of curvature as the pillow receiving surface (48a), and Synthetic resin with upper and lower ends locked inside the upper and lower protrusions (58) and (59) protruding from the front of the rear shell (50), and the middle part can be elastically bent in the front-rear direction A leaf spring material (60) made of metal is disposed.
[0040]
The leaf spring material (60) has a vertical rectangular shape when viewed from the front, and in the center, the upper end is open and the head portion (49a) of the headed shaft (49) is inserted through the slit (61 ) Is formed.
[0041]
On the front surface on both sides of the slit (61) in the leaf spring material (60), protrusions (49c) provided on both sides of the widened head (49b) on the rear surface of the headed shaft (49) are selectively elastically engaged. A plurality of grooves (recesses) (62) facing in the left-right direction, which can be combined with each other, are continuously provided with a slight interval in the vertical direction, and the front surface of the leaf spring material (60) is as shown in FIG. Furthermore, it is a side view waveform surface that is continuous in the vertical direction.
[0042]
Each protrusion (49c) in the headed shaft (49) is in pressure contact with this corrugated surface, so that when the headrest (11) is rotated up and down around the horizontal axis (48), each protrusion (49c) Can be elastically engaged step by step with the concave and convex stripes (62) vertically adjacent to each other, and a moderate resistance can be applied to the turning operation of the headrest (11).
[0043]
In other words, in this example, the projection (49c) on the headed shaft (49) and the leaf spring material (60) provide resistance to impart resistance to the rotation of the headrest (11) relative to the pillow support rod (10). Means are formed.
[0044]
According to this embodiment, without operating the release lever or the like, the pillow support rod (10) is tilted up and down, or the headrest (11) is rotated with respect to the pillow support rod (10). The position and orientation of the headrest (11) can be easily and optimally set in a timely manner according to the body shape and the sitting posture of the seated person.
[0045]
【The invention's effect】
According to the first aspect of the present invention, the side-view concave arc-shaped fitting surface of the headrest is fitted to the side-view convex arc-shaped pillow receiving surface provided in front of the upper end of the pillow support rod, and the pillow support is provided. By inserting the shaft portion of the headed shaft projecting from the front face of the upper end of the heel into a long hole provided in the rear shell of the headrest, and pressing the widened head to the front side of the rear shell, the headrest is In fact, it is possible to obtain the same effect as that of the axial attachment with only a simple structure without axially attaching to the pillow support rod, and the widened head of the headed shaft is pressed against the front side of the rear shell. Only by this, it is possible to easily form the resistance applying means. In addition, the headrest can be easily and quickly attached to the pillow support rod, and the structure is simple and can be manufactured at low cost.
[0046]
According to the second aspect of the present invention, by providing the leaf spring material, a large elastic biasing force for applying a resistance force to the rotation of the headrest can be obtained.
[0047]
According to the third and fourth aspects of the invention, it is possible to give a sense of moderation to the turning operation of the headrest and to stably hold the headrest at a plurality of positions.
[0048]
According to invention of Claim 5, a headrest can be supported stably.
[0049]
According to the invention described in claim 6, the widened heads of the two headed shafts in a state where the left and right headed shafts are brought close to each other by elastically bending the left and right branch portions at the upper end of the pillow support rod inward. Are inserted into the left and right enlarged holes on the rear surface of the headrest, and then both headed shafts are expanded to each other by the restoring force of the left and right branch parts, and these shaft parts are fitted into the left and right elongated holes, respectively. Just by combining them, the headrest can be easily and quickly attached to the pillow support rod.
[Brief description of the drawings]
FIG. 1 is a front view of a chair provided with an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is also a plan view.
4 is a cross-sectional plan view taken along line IV-IV in FIG.
5 is an enlarged longitudinal side view taken along line VV in FIG. 3. FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
8 is a longitudinal sectional front view taken along line VIII-VIII in FIG.
9 is a cross-sectional plan view taken along the line IX-IX in FIG.
10 is a longitudinal sectional front view taken along line XX in FIG. 9;
11 is a longitudinal side view taken along the line XI-XI in FIG. 9;
[Explanation of symbols]
(1) Leg
(2) Support base
(3) Seat
(4) Backrest
(5) Axis
(6) Support rod
(6a) Horizontal part
(6b) Standing part
(7) Upper frame
(8) Back member
(9) Headrest device
(10) Pillow support bowl
(11) Headrest
(12) Opening
(13) Support cylinder
(14) Headrest support
(15) Groove (engaged part)
(16) Lifting rod
(17) Projection (engagement part)
(18) Closure member
(19) Branch
(20) Tube part
(21) Set screw
(22) Support member (support part)
(23) Axis
(24) Expanded collar
(25) (26) Male thread
(27) Planed surface
(28) Cap nut
(29) Inward buttock
(30) Central hole
(31) Cap nut (tightening means)
(32) Disc spring
(33) Friction plate
(34) Resistance imparting means
(35) Convex
(36) Recess
(37) Groove
(38) Engaging claw
(39) Boss
(40) Projection shaft
(41) Set screw
(41a) Head
(42) Outward locking claw
(43) Engaging groove
(44) Slit
(45) Flexible piece
(46) Easy bending piece
(47) Branch
(48) Horizontal shaft
(48a) Pillow receiving surface
(49) Headed shaft
(49a) Shaft
(49b) Wide head
(49c) Protrusion
(50) Rear shell
(51) Cushion material
(52) Outer material
(53) Front shell
(54) Mating surface
(55) Long hole
(56) Narrow part
(57) Enlarged hole
(58) (59) Projection
(60) Leaf spring material
(61) Slit
(62) Recess (recess)

Claims (6)

A pillow-shaped pillow receiving surface that protrudes forward is provided on the front surface of the upper end of the pillow support rod that stands up from the top of the backrest, and a headed shaft having a widened head at the front end is provided on the pillow. Protruding to face the direction of the normal of the receiving surface, and providing a concave arc-shaped fitting surface in a side view with substantially the same curvature as the pillow receiving surface on the rear surface of the rear shell in the headrest, and the headed shaft A long hole facing in the vertical direction through which the shaft part of the head can be inserted is provided, the fitting surface is fitted to the pillow receiving surface so as to be slidable in the vertical direction, and the shaft part of the headed shaft is inserted into the long hole. In addition, the headrest can be swung up and down along the pillow receiving surface by pressing the widened head of the headed shaft against the front side of the rear shell, and attached to the front of the upper end of the pillow support rod. A chair headrest device characterized by. Between the widened head of the headed shaft and the front surface of the rear shell in the headrest, an arc shape having substantially the same center of curvature as the pillow receiving surface is formed, and the upper and lower ends are locked to the rear shell, 2. The headrest device for a chair according to claim 1, wherein a leaf spring material whose middle portion is elastically bendable substantially in the front-rear direction is disposed, and the widened head portion of the headed shaft is friction-welded to the front surface of the leaf spring material. The headrest device for a chair according to claim 2, wherein a plurality of recesses that allow the widened head portion of the headed shaft to engage with the front surface of the leaf spring material are provided at appropriate intervals in the vertical direction. The headrest device for a chair according to claim 2 or 3, wherein the front surface of the leaf spring material is a wave surface continuous in the vertical direction. The upper end of the pillow support collar is bifurcated in the left-right direction, and a pillow receiving surface and a headed shaft are provided at the upper end of each branch, and correspondingly fitted to the rear surface of the rear shell of the headrest. The headrest device for a chair according to any one of claims 1 to 4, wherein a pair of surfaces and long holes are provided on the left and right. By allowing the left and right branch portions to be elastically bent toward each other inward, and by causing the left and right branch portions to be elastically bent toward each other at the opposite edges of the left and right elongated holes in the rear shell of the headrest, 6. The headrest device for a chair according to claim 5, wherein a pair of left and right enlarged holes that allow the widened heads of the left and right headed shafts to be inserted are continuously connected to each other through the narrow portion.

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