JP4149758B2 - Chair headrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a headrest device for a chair, and more particularly to a height adjusting device for the headrest.
[0002]
[Prior art]
As a conventional headrest height adjustment device, for example, as described in Japanese Patent Application Laid-Open No. 2001-314268, a pair of left and right vertical rods (pillow support rods) extending upward from the backrest are used. A plurality of recesses are provided at a predetermined interval in the longitudinal direction, and a claw provided on the headrest is engaged with one of the recesses so that the headrest is held at a desired height, or upside down. A pair of left and right vertical rods (pillow support rods) hanging from the headrest is provided with a plurality of concave portions at a predetermined interval in the longitudinal direction, and a claw provided on the backrest is attached to any one of the concave portions. For example, the headrest can be held at a desired height by being engaged.
In addition, although the headrest can be raised upward step by step, it cannot be lowered from the middle, but once it reaches a predetermined upper limit, it can be lowered to the lower limit for the first time.
[0003]
[Problems to be solved by the invention]
However, in the case of using the former nail described above, every time the height of the headrest is adjusted, the operation of removing the nail from the recess must be performed, and the operation is troublesome, and the latter has a complicated structure. There are problems such as becoming expensive.
[0004]
In view of the above-described problems of the prior art, the present invention is simple in operation and structure, has good workability in assembly and disassembly, and can stably support the headrest. An object of the present invention is to provide a headrest device for a chair that can smoothly move up and down.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A pillow support rod that stands up from the upper part of the backrest and supports the headrest at the upper end, with the lower end attached to the upper part of the backrest and facing almost upward, with an opening on the side And a headrest support portion is formed at the upper end portion of the support tube so as to be freely slidable from above. A lifting / lowering rod provided in a shape, detachably provided on a side surface of the support cylinder so as to close the opening, and selectively elastically engaged with a plurality of engaged portions of the lifting / lowering rod, The elevating rod is constituted by a closing member having an elastically deformable engaging portion capable of holding the lifting rod at a desired height.
[0006]
(2) In the above item (1), the cross section of the rear portion of the support cylinder is V-shaped in a plan view that expands forward, and the rear surface of the lifting rod is supplemented to the front face of the rear portion of the support cylinder. A shape that forms a shape.
[0007]
(3) In the above item (1) or (2), an outward engaging claw that can be elastically deformed inward is provided at the lower part of the lifting rod, and the outward engaging claw is provided on the inner surface of the support cylinder. A vertically extending groove that fits and ends at a position lower than the upper end of the support cylinder is provided, and the outward engagement pawl is engaged with the upper end of the groove to support the lifting rod. Be able to keep it from coming off the tube.
[0008]
(4) In any one of the above items (1) to (3), the outward engaging claw is provided at the substantially center of the rear surface of the lifting rod, and the groove is provided at the substantially center of the front surface of the rear portion of the support cylinder.
[0009]
(5) In any of the above items (1) to (4), by providing two parallel slits on the closing member, a flexible piece is formed between the two slits, and the flexible piece is engaged with the flexible piece. Provide joints.
[0010]
(6) In any one of the above items (1) to (5), the lower end portion of the closing member is engaged with the inner side of the lower edge portion of the opening in the support tube, and the upper end portion of the closing member is connected to the support tube. Screw on the upper edge of the opening.
[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 height of the headrest can be adjusted simply by raising and lowering the headrest against the elastic engagement force between the engaging portion and the engaged portion, After inserting the lifting / lowering rod, it can be easily assembled by attaching a closing member to the opening of the support cylinder, and can be easily disassembled in the reverse order.
Further, since the height adjustment device for the headrest is formed by the support cylinder, the lifting rod, and the closing member, the structure is simple and can be easily manufactured as compared with the conventional height adjustment device having many fine parts.
[0046]
According to the second aspect of the present invention, when the rear surface of the lifting rod that complements the front surface of the rear portion of the support tube having a V-shape in plan view is in sliding contact, the lifting rod does not twist in the support tube. It can always move up and down smoothly without being generated.
[0047]
According to the third aspect of the present invention, when the outward engagement claw is engaged with the upper end of the groove, the lifting rod can be surely prevented from coming off from the support tube, and the lifting rod is unnecessarily detached from the support tube. Can be prevented.
[0048]
According to the fourth aspect of the present invention, the rear surfaces of the both sides of the outward engaging claws of the lifting / lowering rod are smoothly slidably in contact with the front surface of the rear portion of the support cylinder having a V shape in plan view. No twisting force or other external force around the axis of the lifting / lowering rod acts on the direction engaging claw, and the outward engaging claw does not cause a stick phenomenon in the groove or prevent the lifting / lowering. Convenient.
[0049]
According to the invention described in claim 5, by providing two parallel slits in the closing member, a flexible piece is formed between both slits, and an appropriate elastic force is applied to the engaging portion by the flexible piece. Can be granted.
[0050]
According to the sixth aspect of the present invention, the closing member can be easily and reliably attached to the support tube and can be easily removed.
[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 support rod that stands up from the upper part of the backrest and supports the headrest at the upper end, with the lower end attached to the upper part of the backrest, facing almost upward, and provided with an opening on the side And a headrest support portion that is slidably fitted into the support cylinder from above, and a headrest support portion is formed at the upper end portion, and a plurality of engaged portions are provided in a multistage shape on the surface facing the opening. The lifting rod is detachably provided on the side surface of the support cylinder so as to close the opening, and is selectively elastically engaged with a plurality of engaged portions of the lifting rod, thereby And a closure member having an elastically deformable engagement portion capable of holding the desired height at a desired height. The cross section of the rear portion of the support cylinder is V-shaped in a plan view that expands toward the front, and the rear surface of the lifting rod has a shape that complements the front surface of the rear portion of the support cylinder. Chair headrest device. An outward engaging claw that is elastically deformable inward is provided at the lower part of the lifting rod, the outward engaging claw is fitted to the inner surface of the support cylinder, and the upper end is below the upper end of the support cylinder. The groove according to claim 1, wherein a vertically extending groove that terminates at a position is provided, and the elevating hook engages with an upper end of the groove so that the lifting rod can be prevented from being detached from the support tube. Headrest device for two chairs. The headrest device for a chair according to any one of claims 1 to 3, wherein the outward engaging claw is provided at substantially the center of the rear surface of the lifting rod and the groove is provided at substantially the center of the front surface of the rear portion of the support cylinder. The chair according to any one of claims 1 to 4, wherein the closing member is provided with two slits parallel to each other so that a flexible piece is formed between both slits, and an engaging portion is provided on the flexible piece. Headrest device. The lower end of the closing member is engaged with the inside of the lower edge of the opening in the support cylinder, and the upper end of the closing member is screwed to the upper edge of the opening in the support cylinder. A headrest device for a chair according to claim 1.

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