JP4335863B2 - Chair headrest device - Google Patents

Description

  The present invention relates to a headrest device for a chair formed by mounting a headrest on the backrest frame.

As a conventional headrest device, a headrest attached to a substantially central part of the upper side of the backrest frame (see, for example, Patent Document 1), or a headrest column that protrudes upward from the backrest is provided. (For example, refer to Patent Document 1).
JP 2001-314268 A JP 2003-79474 A

  In the headrest device described in Patent Document 1, since the headrest is attached to a substantially central portion of the upper side of the backrest frame, the support strength of the headrest is not sufficient, and both side portions thereof may sway in the front-rear direction. .

Also in the headrest device of Patent Document 2, since the headrest is attached to the headrest column that protrudes upward from the backrest, the support strength is not sufficient especially when the headrest is moved upward, and the headrest and its column are There is a risk of wobbling.
Moreover, since the backrest frame and the frame for supporting the headrest (the recumbent or the support) do not exhibit a sense of unity, there is also a problem that the appearance from the back and side of the chair is poor.

  In view of the above-described problems of the conventional technology, the present invention increases the strength of the headrest support frame so that the headrest can be stably supported, and the backrest frame and the headrest support An object of the present invention is to provide a headrest device for a chair that has a sense of unity with a frame and can improve the appearance.

According to the present invention, the above problem is solved as follows.
(1) In a headrest device for a chair in which a headrest is mounted on an upper part of a backrest frame having a backrest attached to the front side, the backrest frame is arranged in a pair of left and right side frames facing upward and downward, A rear connecting frame that connects the upper ends of the left and right side frames at the rear in the vicinity of the upper end of the backrest, and a headrest frame that attaches the headrest to the front has a U shape in a downward view As described above, the lower ends of the left and right downward side ridges are connected to the upper ends of the left and right side frames of the backrest frame so as to be continuous with each other.

(2) In the above item (1), the contact surface between the side frame of the backrest frame and the downward side ridge of the headrest frame is defined as an inclined surface that is lowered forward.

(3) In the above item (1) or (2), a bottomed connecting hole that opens upward and downward is provided on the opposing surface of the side frame and the downward-facing side flange, and the connecting shaft is provided in both connecting holes. The backrest frame and the headrest frame are connected by fitting the upper and lower ends of the frame and fixing them with fixing means.

(4) In the above item (3), the connecting shaft has a large-diameter shaft at the middle part and a pair of upper and lower small-diameter shafts connected to the upper and lower ends thereof. Are fitted in the connecting holes having the large diameters of the opposing portions of the side frames and the downward side flanges, and the upper and lower small-diameter shafts are respectively connected to the large-diameter connecting holes. Fits into the connecting hole.

(5) The set screw according to any one of the above items (1) to (4), wherein the fixing means is threadedly engaged with the side frame and the downward-side flange so as to penetrate the upper and lower ends of the connecting shaft. And

(6) In any one of the above (1) to (5), the headrest is provided so as to be movable in the vertical direction and height-adjustable by the guide means provided on the rear surface of the both side portions and the left and right downward side ridges.

(7) In the above item (6), the guide means is fixed to the front surface of the downward-facing side ridge and has a guide groove facing in the vertical direction and a plurality of upper and lower engaging grooves on the front surface, and both side portions of the headrest. A sliding piece attached to the rear surface and fitted in the guide groove so as to be slidable up and down, and a pair of left and right brackets each having an elastic tongue piece selectively engaged with the engagement groove To do.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the laterally connecting frame is formed by the laterally connecting frame at the upper end of the backrest frame and the headrest frame having a downward U-shape, and the laterally connecting frame is Since it is located behind the upper end of the drooping and the distance between the upper end of the headrest frame can be reduced, the strength of the headrest frame is increased and the headrest can be stably supported.

In addition, since the lower end of the headrest frame is connected to the upper end of the side frame of the backrest frame so as to be continuous with each other, the backrest frame and the headrest frame have an external appearance, Appearance improves.
Furthermore, when the headrest frame is removed, it can be used as a normal chair without a headrest without a sense of incongruity.

  According to the second aspect of the present invention, the contact area of the contact surface between the side frame of the backrest frame and the downward side ridge of the headrest frame is increased, and the backward load applied to the headrest is inclined forwardly downward. Since the headrest frame is effectively received at the rear end portion of the surface, the headrest frame can be prevented from wobbling rearward at the connecting portion.

  According to the invention described in claim 3, since the upper and lower end portions of the connecting shaft are fitted to the opposite end portions of the side frame and the downward side flange and fixed by the fixing means, their connecting strength is Become big. Moreover, since the connecting shaft is not exposed to the outside, it looks good.

  According to the invention described in claim 4, since the large-diameter shaft of the connecting shaft is fitted to the connecting end portion between the side frame to which the load is most applied and the downward side flange, the connection strength between the connecting shafts becomes larger. .

  According to the fifth aspect of the present invention, since the set screw screwed to the side frame and the downward side hook penetrates the upper and lower ends of the connection shaft, the connection can be made even if an upward load is applied to the headrest. There is no risk that the shaft will fall out of the side frame or the headrest frame will fall off the connecting shaft.

  According to the sixth aspect of the present invention, the headrest can be moved up and down and the height thereof can be adjusted easily and stably by the guide means.

  According to the seventh aspect of the present invention, the height of the headrest can be adjusted very easily because the elastic tongue is selectively engaged with the plurality of engaging grooves simply by moving the headrest up and down along the guide groove. It becomes.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view of a chair to which the present invention is applied, and FIG. 2 is a rear view of the chair.

  As shown in each figure, the chair supports a leg (2) with casters (1), a pedestal (3) standing from its center, and a seat (4) attached to its upper end. A support base (5), and a lower end pivotably attached to both sides of the support base (5), a lower portion is obliquely rearwardly upward, and an upper portion stands behind the seat (4). A backrest (8) having a mesh-like backrest plate (7) made of synthetic resin on the rear surface is attached to the front surface of the backrest frame (6). (9) is an armrest attached to the lower end of the backrest frame (6).

  The backrest frame (6) is a lateral curve in which the opposing surfaces at the upper ends of the pair of left and right side frames (10) and (10) are curved backward in a convex arc shape in the rear in the vicinity of the upper end of the backrest (8). It consists of what was connected by the connection frame (11).

  3 is an enlarged side view of the periphery of the headrest mounting portion, FIG. 4 is an enlarged cross-sectional plan view taken along line IV-IV in FIG. 3, and FIG. 5 is an enlarged cross-sectional plan view taken along line VV.

  As shown in FIG. 3 to FIG. 5, an inclined surface (12) having a front downward inclination is formed at the upper ends of the side frames (10) and (10), and a large opening opens upward on the inclined surface (12). A bottomed connecting hole (13) including a diameter hole (13a) and a small diameter hole (13b) communicating with the lower end of the large diameter hole (13a) is formed in the vertical direction.

  The headrest (14) is attached to the front surface of a headrest frame (15) made of aluminum alloy or the like having a U-shape that is downwardly viewed from the rear.

  The headrest frame (15) has a convex arcuate shape on the upper end of a pair of left and right side down ridges (16, 16) whose left and right separation dimensions are equal to the separation dimensions of the left and right side frames (10). A curved reed (17) is integrally formed continuously.

  At the lower end of the downward-facing ridges (16), (16), an inclined surface (18) is formed with the same inclination angle as the inclined surface (12) at the upper end of the side frame (10). (18) includes a bottomed connecting hole (19) consisting of a large-diameter hole (19a) that opens downward and a small-diameter hole (19b) that communicates with the upper end of the large-diameter hole (19a). It is formed toward. The large diameter hole (19a) and the small diameter hole (19b) have the same diameter as the large diameter hole (13a) and the small diameter hole (13b) of the side frame (10).

  (20) is a connecting shaft, consisting of an intermediate large-diameter shaft (20a), and an upper small-diameter shaft (20b) and a lower small-diameter shaft (20c) that are connected to the upper and lower ends of the same diameter. The shaft (20a) has substantially the same diameter as the upper and lower large-diameter holes (13a) and (19a), and the vertical dimension is substantially equal to the combined length of the large-diameter holes (13a) and (19a). The small-diameter shafts (20b) and (20c) have substantially the same diameter as the small-diameter holes (13b) and (19b), and are slightly shorter than that.

  A pair of guide rails (21) is fixed to the front surface of the left and right downward facing rods (16) in the headrest frame (15) by set screws (34) described later. As shown in FIGS. 4 and 5, guide grooves (22) and (22) are formed on both side surfaces of the guide rail (21). Engaging grooves (23) facing in the left-right direction are provided vertically at predetermined intervals.

  The left and right guide rails (21) are provided on both side pieces (25a) of the support portion (25) with a rearward U-shaped cross section in a plan view in a bracket (24) attached to the lower end of the rear surface of the left and right side portions of the headrest (14). ) (25a) is slidably fitted from the front. A sliding piece (26) slidably fitted in the guide groove (22) is integrally provided on the opposing surface of the both side pieces (25a).

  The inner surface of the base piece (25b) of the support portion (25) is provided with an elastic tongue piece (27) in which the protrusion on the rear surface of the tip portion is elastically engaged with the engagement groove (23). The upper and lower inner surfaces sandwiching 27) are provided with contact pieces (28), (28) that are in sliding contact with the front surface of the guide rail (21). (29) is a stopper pin fitted to the lower end portion of the guide rail (21) so that both side ends are located in the guide groove (22).

  As a result, the bracket (24) moves up and down along the guide rail (21) simply by moving the headrest (14) up and down manually, and at this time, the elastic tongue (27) is moved to the front of the guide rail (21). The headrest (14) can be adjusted to a desired height by selectively and automatically engaging with the engaging groove (23).

  In order to connect the headrest frame (15) to the backrest frame (6), first, the lower small-diameter shaft (20c) of the connecting shaft (20) is connected to the connecting hole (13) at the upper end of the side frame (10). Fit the lower half of the large diameter shaft (20a).

  Next, the connection hole (19) at the lower end of the downward side flange (16) is fitted into the upper half of the upper small diameter shaft (20b) and the large diameter shaft (20a) of the connection shaft (20) protruding upward. Then, the inclined surface (12) of the side frame (10) and the inclined surface (18) of the downward side ridge (16) are brought into contact with each other.

  Next, for the side frame (10) and the lower small-diameter shaft (20c), set screws (31) inserted from the front of the backrest mounting bracket (30) attached to the front of the upper end of the side frame (10). Then, through the mounting hole (32) formed in the side frame (10), it is screwed into the female screw hole (33) facing the front-rear direction formed in the lower small-diameter shaft (20c). As a result, the lower end portion of the connecting shaft (20) is fixed to the connecting hole (13) of the side frame (10) to prevent the connecting shaft (20) from coming off.

  The lower side rod (16) and the upper small-diameter shaft (20b) are provided with a stepped set screw (34) inserted from the front of the lower end portion of the guide rail (21), to the lower end portion of the lower side rod (16). It is fixed by screwing into the female screw hole (36) facing the front-rear direction of the upper small-diameter shaft (20b) through the mounting hole (35), and thereby downward from the upper end of the connecting shaft (20). The side guard (16) is secured. Note that the upper end portion of the guide rail (21) is fixed to the upper end portion of the downward-side ridge (16) by a set screw (34).

  In this way, when the lower end of the headrest frame (15) is connected to the upper end of the backrest frame (6), the horizontal connection frame (11) at the upper end of the backrest frame (6) and the downward U-shaped headrest frame ( 15), a frame that forms a square in the rear view is formed, and the lateral connection frame (11) is located behind the upper end of the backrest (8) and is located at the side of the upper end of the headrest frame (15). Since the distance between the flange (17) is relatively small, the strength of the headrest frame (15) is increased and the headrest (14) is stably supported.

  In the above embodiment, the connecting holes (13) and (19) and the connecting shaft (20) fitted to the connecting holes have a circular cross section, but may have a non-circular cross section such as a square hole and a square axis. In addition, the upper and lower small-diameter shafts (20b) and (20c) are not provided with female screw holes (33) and (36), and the shaft where the pin-shaped shaft portion at the tip of the set screw (31) (34) is simply fitted It may be a hole.

It is a side view which shows one Embodiment of the chair to which this invention is applied. Similarly, it is a rear view. Similarly, it is an enlarged side view around the headrest. FIG. 4 is an enlarged cross-sectional plan view taken along line IV-IV in FIG. 3. Similarly, it is a VV line expansion transverse plane view.

Explanation of symbols

(1) Casters
(2) Leg
(3) pedestal
(4) Seat
(5) Support base
(6) Backrest frame
(7) Backrest board
(8) Backrest
(9) Armrest
(10) Side frame
(11) Horizontal connection frame
(12) Inclined surface
(13) Connecting hole
(13a) Large diameter hole
(13b) Small hole
(14) Headrest
(15) Headrest frame
(16) Downward side
(17) Yokohama
(18) Inclined surface
(19) Connecting hole
(19a) Large diameter hole
(19b) Small hole
(20) Connecting shaft
(20a) Large diameter shaft
(20b) Upper small diameter shaft
(20c) Lower small diameter shaft
(21) Guide rail
(22) Guide groove
(23) Engaging groove
(24) Bracket
(25) Support part
(25a) Side piece
(25b) Base piece
(26) Sliding piece
(27) Elastic tongue
(28) Contact piece
(29) Stopper pin
(30) Backrest mounting bracket
(31) Set screw
(32) Mounting hole
(33) Female thread hole
(34) Stepped set screw
(35) Mounting hole
(36) Female thread hole

Claims (7)

In the headrest device of the chair formed by mounting the headrest on the upper part of the backrest frame with the backrest attached to the front side,
The back frame includes a pair of left and right side frames facing upward and downward, and a lateral connection frame that connects the upper ends of the left and right side frames at the rear in the vicinity of the upper end of the backrest. The headrest frame that attaches the headrest to the front surface has a U-shape that is downwardly viewed from the rear, and the lower ends of the left and right downward side ridges are continuous with the upper ends of the left and right side frames in the backrest frame. A headrest device for a chair, characterized by being connected as described above.   The headrest device for a chair according to claim 1, wherein a contact surface between the side frame of the backrest frame and the downward side ridge of the headrest frame is an inclined surface that falls forward.   A bottomed connecting hole that opens upward and downward is provided on the opposing surface of the side frame and the downward side flange, and the upper and lower ends of the connecting shaft are fitted into both connecting holes and fixed by fixing means. The chair headrest device according to claim 1 or 2, wherein the backrest frame and the headrest frame are connected to each other.   The connecting shaft has a large-diameter shaft in the middle part and a pair of upper and lower small-diameter shafts connected to the upper and lower ends of the connecting shaft. The upper and lower small-diameter shafts are fitted into the small-diameter connecting holes in the back part communicating with the large-diameter connecting holes, respectively, while being fitted into the connecting holes having a large diameter facing the side rod. 3. A headrest device for a chair according to 3.   The headrest device for a chair according to claim 3 or 4, wherein the fixing means is a set screw that is screwed into the side frame and the downward side collar so as to penetrate through the upper and lower ends of the connecting shaft.   The headrest device for a chair according to any one of claims 1 to 5, wherein the headrest is provided so as to be vertically movable and height-adjustable by guide means provided on the rear surfaces of both side portions and the left and right downward side ridges. . A guide means is fixed to the front surface of the downward-facing side ridge and is attached to the front surface of the guide rail having a guide groove facing up and down and a plurality of upper and lower engagement grooves on the front surface, and on both rear surfaces of the headrest, The headrest device for a chair according to claim 6, comprising a pair of left and right brackets each including a sliding piece that is slidably fitted and an elastic tongue piece that selectively engages with the engaging groove. .

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