JP4718974B2 - Chair headrest device - Google Patents

Description

  The present invention relates to a headrest device for a chair.

It is publicly known that a headrest can be adjusted in height and can be rotated around a horizontal axis facing in the left-right direction at the upper part of the back of the chair (see, for example, Patent Documents 1 to 3).
JP 2004-202062 A JP 2003-79474 A JP 2001-314268 A

However, in what is described in Patent Documents 1 and 2, since the headrest height adjustment mechanism and the rotation mechanism are provided on the upper part of the headrest column protruding above the upper end of the backrest frame, The amount of protrusion upward of the column is large, the moment to the headrest column support when the headrest is subjected to a backward load increases, and not only a large stress is generated in the headrest column support but also the headrest column It looks conspicuous and looks bad.
In addition, since the headrest post protrudes greatly above the backrest frame, there is a high risk of placing a hand on it and moving the chair.In this case, too much stress is generated in the support part of the headrest post. Durability may be reduced.

  In what is described in Patent Document 3, the rotation mechanism may be disposed in the vicinity of the backrest frame, but since the height adjustment mechanism is provided inside the headrest, For example, a mesh-lined fabric that can be seen through from the front is unsuitable because the internal height adjustment mechanism is exposed, and the height adjustment mechanism is disposed above the rotation mechanism. Therefore, the difference in stress applied to the rotating mechanism between when the headrest is raised and when it is lowered becomes extremely large, and the balance is poor.

  In view of the above-mentioned problems of the conventional technology, the present invention improves the balance between the headrest with respect to the backrest frame, its center of rotation, and the height adjustment mechanism, thereby preventing a backward load on the headrest. An object of the present invention is to provide a headrest device for a chair that can strongly counteract and can minimize the amount of upward protrusion of a headrest support rod and that is also good in appearance.

According to the present invention, the above problem is solved as follows.
(1) Yes.

(2) In the above item (1) , protrusions facing upward are provided on both sides of the holding part for holding the headrest support rod in the holding member so as to be movable up and down, and protruded from the outer surface of the upper end of both protrusions. A pair of left and right shafts are pivotally supported by a bearing provided on the headrest mounting member.

(3) In the above item (1) or (2) , the holding member has a cylindrical holding portion fitted so that the headrest support rod is slidable in the vertical direction.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the headrest support rod can be moved up and down in front of the rear upper recumbent in the backrest frame, and above the rotation center disposed in front of the rear upper recumbent. Since the holding member that holds the headrest support rod is arranged below the center of rotation and the headrest, the headrest, the center of rotation, and the holding member are placed in close proximity to the rear upper reed. The headrest can be strongly countered against the backward load on the headrest, and the headrest can be supported stably, and the amount of protrusion above the headrest support rod is minimized. be able to.
Therefore, the headrest support rod is not conspicuous and can have a beautiful appearance, and the risk of moving the chair by placing a hand on the headrest support rod is reduced.

Further, the upper end portion of the backrest frame is composed of a front upper recumbent and a rear upper recumbent, the middle portion of which is separated from the front and rear and the both end portions are fixed to the upper end portions of a pair of left and right vertical reeds. Since the mounting member is attached to the rear upper recumbent, the entire headrest device is housed between the front upper recumbent and the rear upper recumbent with good appearance without protruding from the backrest frame to the outside. In particular, it is possible to secure a rotation space in the front-rear direction of a portion below the rotation center of the headrest support rod and the holding member.

According to the second aspect of the present invention, the left and right protrusions are provided on both sides of the holding portion for holding the headrest support rod in the holding member so as to be movable up and down, and are provided on the outer surfaces of the upper ends of the two protruding pieces. Since the pair of shafts are pivotally supported by bearings provided on the headrest mounting member, the headrest supporting rod can be moved up and down between the left and right projecting pieces so that the holding member can be stably attached to the headrest mounting member. Can pivot.

According to the invention described in claim 3 , since the holding member has a cylindrical holding portion fitted so that the headrest support rod is slidable in the vertical direction, the headrest support rod is not tilted left and right. , Can be held stably.

Embodiments of the present invention will be described with reference to the accompanying drawings.
FIGS. 1-15 shows the upper part of the backrest of the chair which attached one Embodiment of this invention, and the detail of each part.
As shown in FIGS. 1 to 6, the backrest (1) of this chair has a pair of left and right vertical saddles (2) and (2) and the middle part is separated from the front and rear, and both ends are left and right. The front upper reed (3) and rear upper recumbent (4) fixed to the upper end of the vertical reed (2) (2), and the middle part are also spaced apart from each other in the same way. A vertical frame (2) is provided with a back frame (5) composed of a front lower horizontal beam and a rear lower horizontal beam (both not shown) fixed to the lower end of the vertical frame (2) (2). ) On the front of the left and right vertical rods (2), (2), the front upper horizontal beam (3), and the front lower horizontal beam (not shown), mesh or canvas upholstery (6), It is stretched.

The front upper recumbent (3) and the rear upper recumbent (4) have a crescent shape in plan view with the central part recessed backward, and the headrest of the present invention is formed in the central part of the rear upper recumbent (4). A device (7) is attached.
The headrest device (7) includes a headrest attachment member (8) attached to the center of the rear upper side reed (4), a headrest (9), and a headrest support rod (9) suspended from the lower end of the headrest (9). 10), a holding member (11) for holding the headrest support rod (10) so that the height can be adjusted, and an upper end portion of the holding member (11) at the front of the rear upper side rod (4), 10) can move up and down, and is provided with a pair of left and right shafts (12) and (12) that are pivotally supported on the headrest mounting member (8) as the main constituent members. 3), as indicated by imaginary lines in FIG. 3, it rotates in the front-rear direction around the axes (12) and (12), and the height is changed as indicated by imaginary lines in FIG. Be able to.

  As shown in FIGS. 5, 6, 9, and 14, the headrest mounting member (8) is provided with a concave groove (13) facing in the left-right direction at the lower end, thereby forming a bifurcated portion at the lower end. The bifurcated portion is straddled on the rear upper side reed (4), and a pair of left and right bolts (14) (14) ) From the rear and a pair of left and right bosses facing the rear provided on the backing plate (15) with the front ends of the bolts (14) and (14) abutting against the front surface of the headrest mounting member (8) (16) It is firmly attached to the rear upper reed (4) by screwing and fastening to (16).

On the rear surface of the bifurcated portion of the headrest mounting member (8), there is provided a horizontally long recess (17) for fitting the heads (14a) and (14a) of the bolts (14) and (14). A cover member (18) covering the heads (14a) and (14a) of the bolts (14) and (14) is detachably fitted to the bolts (14) and (14). 14a) and 14a are not exposed.
In this example, the cover member (18) is a name plate.

  As shown in FIGS. 5, 6, 10, 11, and 14, the holding member (11) has a square tube-like holding portion that is long in the left-right direction and holds the headrest support rod (10) so as to be movable up and down. On both sides of (19), disk-shaped projecting pieces (20) and (20) facing upward are provided, and a pair of left and right projecting on the outer surface of the upper end of both projecting pieces (20) and (20). The holding member (11) is attached to the headrest mounting member (8) by pivotally supporting the shafts (12) and (12) on a pair of left and right bearings (21) and (21) provided on the headrest mounting member (8). It is pivotally attached.

Each shaft (12) is composed of a sleeve (22) made of a material having a low sliding resistance and fixed to the outer surface of each projecting piece (20) so as not to be relatively rotatable with bolts and nuts (23). .
The Ω-shaped leaf spring material (24) provided in the bearing portion (21) is wound around the outer peripheral surface of the sleeve (22) of the shaft (12), and both ends of the leaf spring material (24) are By tightening with bolts and nuts (25) and stopping in the bearing portion (21), an appropriate resistance is applied to the rotation of the holding member (11).

  On both sides of the front surface of the headrest mounting member (8), concave portions (26) and (26) facing rearward are provided, and the concave portions (26) and (26) protrude forward and have front ends. Projections (27a) and (27a) provided at the rear ends of a pair of left and right arm members (27) and (27) whose upper surface is in contact with the lower surface of the front upper reed (3) are fitted. .

  A rear piece (27b) protrudes from the lower rear end of each arm member (27), and the upper surface of the rear piece (27b) is brought into contact with the lower surface of the headrest mounting member (8). When the load to push down the front end portion of the arm member (27) is applied to the headrest mounting member (8) by bringing the headrest mounting member (8) downward, the upper surface of the rear piece (27b) is The arm member (27) is prevented from bending by being pressed against the lower surface of (8).

On the rear upper surface of the rear piece (27b) of the arm member (27), an upward engagement claw (27c) is provided, and this engagement claw (27c) is provided on the lower surface of the headrest mounting member (8). By engaging with the front edge of the provided engagement hole (28), the arm member (27) can be prevented from moving forward and the arm member (27) can be prevented from coming off.
The engaging claw (27c) is provided downward on the lower surface of the headrest mounting member (8), and is engaged with the rear edge of the engaging hole (28) provided in the rear piece (27b). May be.

  The headrest when the force for tilting the headrest (9) is applied by bringing the upper surfaces of the front end portions of the arm members (27) and (27) into contact with the lower surface of the front upper lateral rib (3). The mounting member (8) can be reliably prevented from pivoting backward, and the headrest mounting member (8) can be firmly attached to the rear upper reed (4).

  The headrest (9) overlaps the horizontally long rectangular front frame (29) and the rear frame (30) with each other, and on the front surface of the front frame (29) is the same as the upholstery (6) in the backrest (1) It consists of a tension material (31).

The headrest support rod (10) is formed integrally with the rear frame (30), and hangs down from the center of the lower end of the rear frame (30) in the shape of a plate or tongue that faces in the left-right direction.
On the front surface of the headrest support rod (10), there are provided oval recesses (32) that are elongated in the vertical direction. Are formed at equal intervals in the vertical direction, and are formed with sliding grooves (34) facing the vertical direction.
Further, in the center of the rear surface of the headrest support rod (10), a groove (35) is provided that faces in the vertical direction.

  As shown in FIGS. 5 to 15, the holding portion (19) of the holding member (11) has a rear U-shaped front half (36) so as to sandwich the plate-like headrest support rod (10) from the front and rear. The left and right sides of the forward U-shape with the projecting pieces (20) and (20) connected to the upper ends of both sides are butted against each other and tightened with bolts and nuts (38) at the right and left sides. It is formed in a rectangular tube shape that is long in the direction.

  As shown in FIG. 10, FIG. 12, and FIG. Guide means (41) comprising an arcuate sliding contact member (39) and butyl rubber and other elastic bodies (40), which are contracted between the respective sliding contact members (39) and the inner surface of the holding portion (19). ) Is provided. The cross-sectional shape of the left and right side ends of the headrest support rod (10) is preferably a semicircular arc shape as shown in FIG. 12, and is slidably contacted with the inner surface of the slidable contact member (39) having a V shape in plan view.

On the outer surface of each sliding contact member (39), a cross-shaped protrusion (42) is provided, and the protrusion (42) is formed in a hole (43) provided in the opposing part of the elastic body (40). ), Each sliding contact member (39) is prevented from coming off by the holding portion (19) via the elastic body (40) and can be handled integrally with the elastic body (40). Assembling work is improved.
In this example, the holding portion (19) is provided with two pairs of upper and lower guide means (41) (41), but three or more pairs may be provided.

  As shown in FIGS. 6, 8, and 15, a circular shallow recess (44) is provided at the center of the rear surface of the front half (36) in the holding portion (19), and the inside of the recess (44) Includes a pair of upper and lower wedge-shaped protrusions (45) and (45) whose tip portions are opposed to each other, and left and right sides of the left and right sides of which the opposing surfaces form convex arcuate surfaces. A pair of projecting pieces (46) and (46) project rearward.

In the recess (44), the upper and lower ends of a pair of left and right arcs (47) (47) that are in sliding contact with the inner surface of the sliding groove (34) on the front surface of the headrest support rod (10) are provided. A butterfly-shaped elastic body (49) formed in a loop shape by being connected by a pair of upper and lower connecting pieces (48) (48) having a V-shaped recessed portion (48a) (48a) in the center, The V-shaped recessed portions (48a) (48a) of the upper and lower connecting pieces (48), (48) are engaged with the inner sides of the upper and lower pair of projecting pieces (45), (45), and the upper and lower connecting pieces. (48) The left and right sides of the recessed portions (48a) and (48a) of the recessed part (48a) should be in contact with the inner arc surface of the pair of left and right projecting pieces (46) and (46). The front end portions of (47) and (47) are held so as to maintain the outer shape of the arc portions (47) and (47) by contacting the inner peripheral surface of the concave portion (44).
The elastic body (49) is preferably formed of a synthetic resin material into a circular or daruma loop shape.

  In addition, an elastic engagement claw (50) having an outward claw (50a) at the front end projecting forward is provided at the center of the front end of the left and right arc portions (47) and (47) of the elastic body (49). Each of the elastic engagement claws (50) is fitted into a pair of left and right engagement holes (51) (51) provided in the front half (36) of the holding portion (19), and each of the claws (50a ) Is locked to the outer edge of the engagement hole (51), so that the elastic body (49) is prevented from coming off from the recess (44).

The elastic body (49) is fitted into the recess (32) on the front surface of the headrest support rod (10), and the left and right arc portions (47), (47) of the elastic body (49) are provided with a narrow width portion (33). The headrest (9) moves up and down smoothly with a moderate feeling when the arc portion (47) passes through the narrow width portion (33) by being pressed against both inner side surfaces of the sliding groove (34). can do.
Further, since the elastic body (49) is slidably contacted along the inner surface of the sliding groove (34) at the arc portions (47) and (47), there is little possibility of causing local wear and good durability.
Furthermore, since the elastic body (49) has a loop shape as described above, the structure is simple, it can be easily manufactured, and it can be easily attached to and detached from the holding portion (19).

  In the center of the front surface of the rear half (37) of the holding portion (19), the headrest support rod is always separated from the rear, facing the recess (35) provided on the rear surface of the headrest support rod (10). A ridge (52) facing upward and downward is provided so as to be fitted into the recess (35) when a load is applied to (10) in the rearward direction.

  By providing the recess (35) and the protrusion (52), when the headrest support rod (10) is not loaded in the rearward direction, the recess (35) and the protrusion (52) The headrest support rod (10) can be moved up and down smoothly with respect to the holding member (11) without causing friction between them, and the headrest support rod (10) is directed to the rear. When the hang is applied, the recess (35) and the protrusion (52) are engaged with each other, and the headrest supporting rod (10) and the holding member (11) are engaged with each other between the rigid bodies, so that the headrest (9) It is possible to strongly counteract the load applied to the headrest, to prevent the headrest (9) from tilting sideways, and to prevent excessive elastic deformation of the elastic body (40). Can be prevented.

As shown in FIGS. 3 to 6, a plurality of window holes (53) are provided side by side in the left-right direction in the upper part of the rear half (37) of the holding part (19). On the lower surface of the rear portion of the headrest mounting member (8) corresponding to the window hole (53), a plurality of comb-shaped protrusions (54) having a triangular side shape are provided as the holding member (11) rotates. Are provided so as to advance and retract in the corresponding window holes (53).
By providing the window hole (53) and the projecting piece (54), when the headrest (9) is rotated, the holding member (11) is rotated and the headrest mounting member (8) is held. It is possible to prevent a finger or the like from being caught in the gap with the member (11).

As is clear from the above, according to this embodiment, the headrest supporting rod (10) can be moved up and down in front of the rear upper recumbent (4) in the backrest frame (5) and the rear upper lateral A holding member (11) that holds the headrest (9) above the shaft (12) that is the center of rotation disposed in front of the rod (4) and the headrest support rod (10) below the shaft (12). ), The headrest (9), the shaft (12), and the holding member (11) can be placed in close proximity to the rear upper side reed (4), and the headrest (9 ), The headrest (9) can be stably supported, and the upward protrusion of the headrest support rod (10) can be minimized. can do.
Therefore, the headrest support rod (10) is inconspicuous and can have a beautiful appearance, and the possibility of moving the chair by placing a hand on the headrest support rod (10) is reduced.

  Further, the upper end portion of the backrest frame (5) is composed of a front upper recumbent (3) and a rear upper recumbent (4) whose middle part is separated from front to back, and the headrest mounting member (8) is Since it is attached to the recumbent ridge (4), the headrest device (7) as a whole can be laid out without projecting from the backrest frame (5) to the outside. 4), and in particular, it is possible to secure a rotational space in the front-rear direction of a portion below the rotational center of the headrest support rod (10) and the holding member (11).

  Further, on both sides of the holding portion (19) for holding the headrest support rod (10) in the holding member (11) so as to be movable up and down, protruding pieces (20) and (20) facing upward are provided, and both protruding pieces (20 ) (20) A pair of left and right shafts (12) and (12) protruding from the outer surface of the upper end are pivotally supported by the bearing (21) provided on the headrest mounting member (8). The headrest support rod (10) can be moved up and down between the projecting pieces (20) and (20), and the holding member (11) can be stably pivoted on the headrest mounting member (8).

  Moreover, since the holding member (11) has a cylindrical holding portion (19) fitted so that the headrest support rod (10) is slidable in the vertical direction, the headrest support rod (10) is It can be held stably without tilting left and right.

As mentioned above, although preferable embodiment of this invention was described, this invention can also be implemented in the following deformation | transformation aspects within the range which does not deviate from a claim.
(a) In the middle part of the headrest support rod (10), a long long hole is provided in the vertical direction penetrating in the left-right direction, and one shaft penetrating the long hole is provided at the upper end of the holding member (11). The left and right protruding pieces (20) and (20) are pivotally attached to the headrest mounting member (8).
(b) The holding portion (19) of the holding member (11) is not completely cylindrical, but has a C-shaped cross section with an open rear surface or front surface.

It is a front view of the upper part of the backrest of a chair provided with one embodiment of the present invention. Similarly, it is a rear view. Similarly, it is a side view, and is a diagram showing a state when the headrest is rotated in the front-rear direction by an imaginary line. Similarly, it is a side view, and is a diagram showing a state when the headrest is moved upward by an imaginary line. Similarly, it is the disassembled perspective view seen from diagonally forward. Similarly, it is the disassembled perspective view seen from diagonally backward. Similarly, it is the expansion disassembled perspective view which decomposed | disassembled only one part and was seen from diagonally forward. Similarly, it is an enlarged perspective view showing the attached state of the elastic body when the front half of the holding member is viewed obliquely from the rear. It is the IX-IX line vertical side view of FIG. It is the XX line longitudinal cross-sectional front view of FIG. It is the XI-XI line crossing top view of FIG. FIG. 11 is an enlarged cross-sectional plan view taken along line XII-XII in FIG. 10. FIG. 11 is an enlarged cross-sectional plan view taken along line XIII-XIII in FIG. 10. It is the XIV-XIV line enlarged vertical side view of FIG. It is the XV-XV line crossing top view of FIG.

(1) Backrest
(2) Downspout
(3) Front upper side
(4) Rear upper recumbent
(5) Backrest frame
(6) Upholstery
(7) Headrest device
(8) Headrest mounting member
(9) Headrest
(10) Headrest support rod
(11) Holding member
(12) Axis
(13) Groove
(14) Bolt
(14a) Head
(15) Batting plate
(16) Boss
(17) Recess
(18) Cover member
(19) Holding part
(20) Projection
(21) Bearing part
(22) Sleeve
(23) Bolt / Nut
(24) Leaf spring material
(25) Bolt / Nut
(26) Recess
(27) Arm member
(27a) Projection
(27b) Backward piece
(27c) Engaging claw
(28) Engagement hole
(29) Front frame
(30) Rear frame
(31) Upholstery
(32) Recess
(33) Narrow part
(34) Sliding groove
(35) Concave
(36) First half
(37) Second half
(38) Bolt / Nut
(39) Sliding member
(40) Elastic body
(41) Guide means
(42) Projection
(43) Hole
(44) Recess
(45) (46) Projection
(47) Arc part
(48) Connecting piece
(48a) Recessed part
(49) Elastic body
(50) Elastic engagement claw
(50a) Nail
(51) Engagement hole
(52) ridge
(53) Window hole
(54) Projection

Claims (3)

The upper end of the backrest frame of the chair is constituted by a front upper recumbent and a rear upper recumbent, the middle part of which is separated from the front and rear, and the both end parts are fixed to the upper end part of a pair of left and right vertical reeds, A headrest attachment member is attached to the rear upper recumbent , and an upper end portion of a holding member that holds the headrest support rod hanging from the lower end of the headrest is adjustable to the headrest attachment member in front of the rear upper recumbent . The headrest device for a chair is characterized in that the headrest support rod is pivotally attached with an axis directed in the left-right direction so that the headrest support rod can move up and down. Protruding pieces facing upward are provided on both sides of the holding portion for holding the headrest support rod in the holding member so that it can move up and down, and a pair of left and right shafts protruding from the outer surface of the upper end of both protruding pieces headrest apparatus of claim 1 Symbol mounting of the chair is characterized in that is pivotally supported by a bearing provided on. The headrest device for a chair according to claim 1 or 2 , wherein the holding member has a cylindrical holding portion fitted so that the headrest support rod is slidable in the vertical direction.

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