JP4855687B2 - Chair backrest mounting device - Google Patents

Description

  The present invention relates to a chair back attaching device in which a back is attached to a pair of backrests standing upright from both sides of a rear portion of the chair.

  Conventionally, as the chair backrest mounting apparatus as described above, for example, those described in the following (A) and (B) are known.

(A) A structure in which through holes are provided in the upper and lower sides of both dorsal fins, and bolts are inserted into the through holes, and the dorsal fins and the backrest are screwed together (for example, see Patent Document 1).

(B) The shaft is inserted into the left and right through holes provided at the upper ends of the back ridges, bearings are provided on both sides of the shaft, and the cover material covering the both bearings and the upper ends of the shaft and the back ridges is front and rear. A structure is provided in which through holes are provided facing each other, bolts are inserted into the through holes of the cover material, and the cover member, both bearings, and the backrest are screwed together with the bolts (see, for example, Patent Document 2).
Japanese Utility Model Publication No. 36-21525 Japanese Utility Model Publication No. 45-16123

  However, in the chair backrest mounting structure described in Patent Document 1, the through holes through which the bolts are inserted are provided directly above and below the dorsal fin. It becomes weak in the part. Furthermore, since the entire back surface of the backrest is covered with the cover member including both the backrests, the thickness of the entire backrest increases, and there is a problem that the design cannot be made light.

  In addition, although the design of the chair backrest mounting structure described in Patent Document 2 can be simplified, the bolts that screw the cover member, both the bearings, and the backrest are two places on the left and right sides. There is a problem that it is weak and cannot be used for a backrest having a large back support area.

The present invention has been made to solve the conventional problems as described above,
The backrest design of the chair is excellent in strength and can be used without problems in terms of strength even for a backrest with a large back support area, and it can give a light feeling with less design restrictions. It is an object of the present invention to provide a chair backrest attaching device capable of taking the action.

According to the present invention, the above problem is solved as follows.
(1) It hangs down from the receiving part in the receiving material which has the contact surface which contact | abuts the rear surface of a backrest on the front side in the upper end opening part of a pair of right and left dorsal fins formed by the tubular member which stands up from the back of a seat. By fitting the formed shaft portions, receiving members are respectively attached to the upper ends of a pair of left and right dorsal fins, the receiving members and the vertical intermediate portions of the backrests are screwed together, and the dorsal fins The lower portions of the backrest are connected to each other by a connecting member, the lower portion of the backrest is brought into contact with the front surface of the connecting member, and the lower portion of the backrest is fixed to the connecting member with an attaching screw that penetrates the connecting member .

( 2 ) In the above item ( 1 ), a cover member that covers the front and rear of the lower portions of both dorsal fins and hides the connecting member from the outside is provided.

(3) above (1) or (2) Oite in section two back rods are formed in the side view L-shaped and a horizontal portion and a vertical portion, the bent portion to the L-shaped, connecting member Are fixed across both the horizontal part and the vertical part.

( 4 ) In any one of the above items ( 1 ) to ( 3 ), the lower front ends of the dorsal fins are attached to a support base supporting the seat so as to be rotatable in the vertical direction, and the support base, the connecting member, In between, a gas spring is provided for biasing the dorsal fin to stand.

According to the present invention, the following effects can be achieved.
(A) According to the invention described in claim 1, since the lower portions of both dorsal fins are connected to each other by the connecting members, a strong dorsal structure is obtained. And, with the receiving material attached to the upper end of both strong dorsal fins, the vertical middle part of the backrest is fixed, and the lower part of the backrest is connected to the connecting member that connects the lower parts of both dorsal fins Since it is fixed, a combined structure of the backrest and the backrest having a large strength can be obtained. Thereby, even if it is a backrest with a big back support surface, it can be attached without a problem and the design restrictions which depend on an intensity | strength reduce.

(B) Moreover, since the tubular member is used for the dorsal fin, weight reduction and strength improvement of the dorsal can be achieved. Further, by using a tubular member for the dorsal fin, the opening on the upper end side of the dorsal can be used as a portion to which the receiving material is fitted and attached as it is, so that the structure can be simplified. Further, since the fitting portion of the receiving material can use a tubular or rod-shaped material, the strength and weight of the receiving material can be improved and design constraints are reduced.

(C) According to the invention described in claim 2 , the appearance can be improved by covering the connecting member with the cover member.

(D) According to the invention of claim 3 , each end of the connecting member is fixed across both the horizontal part and the vertical part of the L-shaped dorsal fin. It becomes a reinforcing part in the front-rear direction, and the strength against the L-shape between the horizontal part and the vertical part increases, and a strong dorsal fin is obtained.

(E) According to the invention as set forth in claim 4 , since the gas spring is provided between the rear portion of the support base and the connecting member so as to urge both the backrests upright, the rotation of the backrest is controlled by the spring. The action can be used to make it light.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a chair to which the present invention is applied. FIG. 1 is a side view thereof, FIG. 2 is a rear view thereof, FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. FIG. 4 is a partially enlarged view of FIG. 3.

  1-4, the chair (1) has a pedestal (4) upright at the center of five legs (3) with casters (2), and the front and rear of the pedestal (4) It has a basic structure in which a long support base (5) is rotatably mounted.

  Mounted on the support base (5) are a seat (6) and a backrest assembly (8) for supporting the backrest (7). A well-known gas spring is provided between the dorsal assembly (8) and the support base (5) to urge the backrest (7) so as to stand up together with the dovetail assembly (8). (9) is attached. Further, a backrest (7) and a cover member (10) that covers a part of the front and rear surfaces of the backpack assembly (8) are attached to the backpack assembly (8).

  FIG. 5 is an exploded perspective view of a main part showing the structure of the backpack assembly (8) and its peripheral part, and FIG. 6 is an exploded perspective view of the backpack assembly (8). In FIG. 6, some members of the dorsal assembly (8) are omitted. As shown in FIGS. 5 and 6, the dowel assembly (8) includes a pair of left and right dorsal fins (11) and (11) and intermediate portions of the dorsal fins (11) and (11) connected to each other. And a shaft (13) for connecting the front ends of the dorsal fins (11) and (11) to each other. And the receiving material (14) is attached to the upper end of the backpack (11) (11), respectively.

  Each dorsal fin (11) (11) is formed of a metal tubular member, that is, a pipe material, and an intermediate portion is bent forward of the chair (1) to provide a vertical portion (11a) and a horizontal portion (11b). As a whole, it is formed in a substantially L shape in a side view. In addition, the upper ends of the vertical portions (11a) and (11a) facing upward of the chair (1) are left open, and the front and rear of the chair (1) are directly below the upper opening (15). A mounting hole (16) penetrating in the direction is provided. On the other hand, the front end of the horizontal portion (11b) facing the front of the chair (1) is closed, and a mounting hole (17) penetrating in the left-right direction of the chair (1) is provided at the front end portion.

The connecting member (12) is composed of a backrest mounting connecting member (12A) formed of a metal plate and an intermediate member (12B) formed of the same metal plate. As is clear from FIG. 5, both ends of the intermediate member (12B) are vertically bent (11a) (11a) and horizontal (11b) (11b) at the bent portions of the left and right dorsal fins (11) and (11). Are fixed by welding. On the other hand, both ends of the backrest mounting connecting member (12A) are fixed to the vertical portions (11a) and (11a) by welding, respectively, immediately above the intermediate member (12B). Therefore, the back plate mounting bracket (12A) and the intermediate member (12B) are attached between the left and right back saddles (11) and (11) in a state where they are extended in the left and right direction of the chair (1). The intermediate portions and the lower portions of the dorsal fins (11) and (11) are connected to each other.

  In the present embodiment, each end of the intermediate material (12B) is welded in a state straddling the vertical portions (11a) (11a) and the horizontal portions (11b) (11b), respectively. The material (12B) also serves as a reinforcement in the front-rear direction in each backpack (11) (11).

  In addition, the central portion (12a) of the back plate mounting bracket (12A) is bent in a state of bulging toward the front side of the chair (1), and the bulged central portion (12a) is used as a locking portion. Is done. In the central portion (12a), two backrest mounting holes (18A) (18A) are formed at positions separated from each other on the left and right. On the other hand, in the intermediate material (12B), two gas bracket mounting holes (18B) (18B) are provided at positions that are also separated from each other in the left-right direction. The gas bracket (19) is attached to the gas bracket attachment holes (18B) (18B).

  Both ends of the shaft (13) are passed through the mounting holes (17) of the left and right dorsal fins (11) and (11), and are fixed by welding on the outside of both dorsal fins (11) and (11). (11) The front ends of (11) are connected to each other. A stage (23) is attached to the horizontal portions (11b) and (11b) of the dorsal fins (11) and (11) by welding immediately behind the shaft (13). As shown in FIGS. 3 and 4, each stage (23) has a rear shaft (22 a) facing the left-right direction of the seat frame (21) in the seat (6) together with the seat holder (20) and the chair (1 ) Is supported so as to be rotatable in the vertical direction. The front shaft (22b) facing the left-right direction of the seat frame (21) is rotatably attached to the front end side of the support base (5) as shown in FIG.

  The cover member (10) is composed of a rear cover (10A) attached from the lower back side of the back assembly (8) and a front cover (10B) attached from the front upper side of the back assembly (8). The backrest assembly (8) is attached to the intermediate portion of the backrest assembly (8) so as to cover the backrest attachment connecting member (12A) and the intermediate member (12B).

The rear cover (10A) is formed of a synthetic resin material, covers the entire back side of the backrest mounting connecting member (12A) and the intermediate member (12B) of the backpack assembly (8), have upper bent portion that can abut on the back surface and the lower surface of the solid (8) (24A) and a lower bent portion and (24B) integrally, vertical side vision Se杆(11) It is substantially the same as the bent shape in the middle part, and is formed in an L shape.

  In addition, on the inner surface (front side) of the rear cover (10A), on the left and right positions facing the left and right dorsal fins (11) and (11) respectively, the upper bent portion from the upper end of the upper bent portion (24A) An engagement groove (25) in which a part of each backrest (11) can be fitted in a state of being continuous over the front end of (24B) is provided. The lower bent portion (24B) has a notch (26) for releasing the gas spring (9) at the center in the left-right direction of the chair (1) and the front end of the lower bent portion (24B). To the rear end side.

  Furthermore, on the inner surface of the lower bent portion (24B) of the rear cover (10A), there are boss-shaped contact portions (27) and (27), respectively, on the left and right sides of the cut groove (25). Each is provided so as to protrude obliquely forward and upward. A screw hole (28) is formed in the center of the projecting end face of each contact portion (27) (27).

  On the other hand, a pair of left and right abutting portions (29) and (29) that are pin-shaped on the inner surface of the upper bent portion (24A) of the rear cover (10A) at a position separated from the left and right directions of the chair (1). Are provided so as to protrude diagonally forward and upward, respectively. A screw hole (30) is formed at the center of the protruding end face of each contact portion (29).

  The front cover (10B) is made of a synthetic resin material, covers the entire front side of the backrest attachment connecting member (12A) and the intermediate member (12B) of the backpack assembly (8), It has an upper bent part (31A) and a lower bent part (31B) so that it can be placed in contact with the front side and the upper side of the three-dimensional body (8). It is substantially equal to the bent shape in the middle part of the ridge (11), and is formed in an L shape.

  In addition, on the inner surface (rear side) of the front cover (10B), at the positions facing the left and right dorsal fins (11) (11), respectively, from the upper end of the upper bent portion (31A) to the lower bent portion ( An engagement groove (32) into which a part of each backrest (11) can be fitted in a state of being continuous over the front end of 31B) is provided.

  Further, the lower bent portion (31B) of the front cover (10B) has left and right contact portions (24B) on the lower bent portion (24B) of the rear cover (10A) as shown in FIGS. Corresponding to 27), the contact portion (33) is formed so as to protrude rearward and downward from the inner surface of the front cover (10B). The protruding end surface of the contact portion (33) is provided with a positioning recess (34) in which the tip of the contact portion (27) is inserted and positioned, and a mounting hole is provided at the center of the positioning recess (34). (35) is drilled.

  At the upper end of the upper bent portion (31A) of the front cover (10B), it is located between the left and right engaging grooves (32), (32), and projects from the rear side at a substantially right angle. A portion (36) is provided. On the top surface of the top plate portion (36), a plurality of ribs (37) extending in the front-rear direction are provided at regular intervals in the left-right direction. Further, as shown in FIG. 4, the lower surface side of the top plate portion (36) corresponds to the left and right contact portions (29) in the upper bent portion (24A) of the rear cover (10A). (38) is formed to protrude rearward and downward from the inner surface. An attachment hole (40) is formed in the center of the protruding end surface of the contact portion (38).

  Further, the upper bent portion (31A) of the front cover (10B) is located immediately below the top plate portion (36) and in a position corresponding to the backrest mounting connecting member (12A) in the left-right direction. An elongated window hole (41) is provided through the front and rear, so that the locking piece (42) hangs into the window hole (41) from the upper edge of the window hole (41). Is provided.

  As shown in FIGS. 7 to 9, the receiving member (14) includes a receiving portion (43) having a contact surface (43 a) with the back surface of the backrest (7), and a lower side of the receiving portion (43). And a shaft portion (44) that is suspended, and is integrally formed of a synthetic resin material. An attachment hole (45) penetrating in the front-rear direction is provided at the center of the receiving portion (42). On the other hand, the shaft portion (44) has a plurality of recesses (46) on the peripheral surface, and can be press-fitted into the opening (15) of the backpack (11). Further, the shaft portion (44) is adapted to correspond to the mounting hole (16) of the dorsal fin (11) when the shaft portion (44) is fitted to a predetermined position of the dowel (11). A mounting hole (47) penetrating in the front-rear direction is provided.

  As shown in FIG. 3, screw holes (48), (48) are provided at the left and right positions corresponding to the left and right dorsal fins (11), (11) at the center of the back of the backrest (7) in the vertical direction. Is provided. A screw hole (49) is also provided at a position corresponding to the backrest mounting holes (18A) (18A) of the backrest mounting connecting material (12A) of the connecting member (12) at the lower end of the backrest (7). Yes.

  Next, in the chair (1) thus configured, an example of a procedure for assembling the receiving members (14), (14), the backrest (7), and the cover member (10) to the backpack assembly (8), respectively. Will be explained.

[Attaching the receiving material (14) to the dowel assembly (8)]
First, with the contact surface (43a) facing forward, the shaft portion (44) of the receiving material (14) is inserted into the openings (15), (15) of the dorsal fins (11), (11) from above, respectively. After that, the mounting bolt (50A) is screwed onto the nut (50B) provided in the shaft portion (44) of the receiving material (14) through the mounting holes (16) and (47) from the outside of the backpack (11). . Thereby, each receiving material (14) (14) is each attached to the upper end of both dorsal fins (11) (11).

[Attaching the front cover (10B) to the back assembly (8)]
The front cover (10B) is faced from the front upper side of the backpack assembly (8) so as to cover the backrest mounting connecting material (12A) and the intermediate material (12B) of the backpack assembly (8), and The locking piece (42) is inserted into the back side of the connecting member for mounting the backrest (12A), and the front and back surfaces of the central portion (12a) of the connecting member for mounting the backrest (12A) are connected to the inner surface of the front cover (10B). It is sandwiched and held elastically by the locking piece (42). By this holding, the front cover (10B) is temporarily placed on the upper side (front side) of the back assembly (8) without rattling. Further, in this state, the central portion (12a) of the backrest attachment coupling member (12A) is exposed to the front side of the front cover (10B) through the window hole (41).

[Attaching the backrest (7) to the backpack assembly (8)]
The mounting hole (45) of the receiving member (14) is opposed to the screw hole (48) of the backrest (7), and the backrest mounting coupling member (12A) exposed through the window hole (41) Match the mounting hole (18A) to the screw hole (49) of the backrest (7), and connect the back surface of the backrest (7) to the contact surface (43a) of the back plate (14) and the backrest mounting connecting material (12A) Contact each other. After that, the mounting screw (51) is screwed into the screw hole (48) from the outside of the back surface of the receiving material (14) through the mounting hole (45), and the mounting screw (52) is connected to the back mounting bracket (12A). From the outer side of the back, it is screwed into the screw hole (49) through the backrest mounting hole (18A). As a result, the backrest (7) is attached to the backpack assembly (8).

[Attaching the rear cover (10A) to the back assembly (8)]
Next, the rear cover (10A) is faced from the lower side of the back cover assembly (8) to the front cover (10B) temporarily mounted on the back cover assembly (8), and the front cover (10B) and rear cover (10A) are mated. At this time, the rear cover (10A) engages the contact portions (27) and (27) in the positioning recesses (34) and (34) of the contact portions (33) and (33) of the front cover (10B). Then, the abutting portions (29) and (29) are brought into contact with the abutting portions (38) and (38) of the front cover (10B) for surface matching.

  Thereafter, the mounting screw (53) is screwed into the screw hole (28) of the contact portion (27) (27) from the mounting hole (35) of the contact portion (33) (33), and the rear cover (10A) Screw between the front cover (10B). Similarly, the mounting screws (54) are screwed into the screw holes (30) of the contact portions (29) and (29) from the mounting holes (40) of the contact portions (38) and (38), and the rear cover (10A ) And the front cover (10B). Thus, the cover member (10) is assembled to the backpack assembly (8) in a state in which the backlash between the rear cover (10A) and the front cover (10B) is further eliminated.

  Then, the cover member (10) assembled in this way covers the part connected by the backrest mounting connecting member (12A) and the intermediate member (12B) from the top, bottom, left and right directions, and the backrest. The attachment connecting member (12A) and the intermediate member (12B) can be assembled in a state of being almost completely hidden from the outside.

  As a result, the assembly of the back saddle assembly (8), the cover member (10) and the backrest (7) is completed. In addition, the dowel assembly (8) incorporating the cover member (10) and the backrest (7) in this manner is rotatably attached to the shaft (13) to the support base (5) and the stage (23) to the rear. When it is connected to the shaft (22a) and the gas spring (9) is assembled between the gas bracket (19) and the support base (5), the attachment on the backrest (7) side is completed.

  Therefore, according to the configuration described above, the intermediate portions of the dorsal fins (11) and (11) are connected to each other by the connecting member (12), so that a strong dorsal structure is obtained. And, with the receiving material (14) (14) attached to the upper ends of the dorsal fins (11) and (11) with high strength, the middle part in the vertical direction of the backrest (7) is fixed and the backrest (7) Since the lower part is fixed to the lower part of the dorsal fins (11) and (11) with the connecting member (12), a combined structure of the dorsal fins (11) and (11) and the backrest (7) having high strength is obtained. It is done. As a result, even if the back support surface has a large backrest, it can be mounted without any problems, design restrictions that depend on the strength are reduced, and a free design is possible.

  In addition, since a tubular member is used for the dorsal fin (11) (11), the weight of the dorsal fin (11) can be reduced and the strength can be improved, and a receiving material can be provided at the upper end opening (15) of the dorsal fin (11). Since the shaft portion (44) of (14) can be fitted and attached, the strength can be improved and the weight can be reduced, and the design of the receiving material (14) can be made light.

  Furthermore, since the connecting member (12) is covered with the cover member (10), it looks good. In addition, each end of the connecting member (12) is fixed so as to straddle both the vertical part (11a) and the horizontal part (11b) of the L-shaped dorsal fin (11) (11). The material (12) becomes a reinforcing portion, and the strength between the vertical portion (11a) and the horizontal portion (11b) is increased, and a dorsal structure having a high strength is obtained. Moreover, since the gas spring (9) which urges | biases both dorsal fins (11) (11) in the direction to stand up is provided between the rear part of the support base (5), and the connection member (12), the backrest ( The rotation of 7) can be made light by using its spring action.

  Although one embodiment of the present invention has been described above, various modifications and changes can be made to each of the above embodiments without departing from the scope of the claims of the present invention.

It is a side view of one embodiment of a chair to which the present invention is applied. It is a rear view of a chair same as the above. It is a longitudinal cross-sectional view which follows the III-III line of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is a principal part disassembled perspective view which shows the structure of the backrest assembly applied to the chair same as the above, and its peripheral part. It is a disassembled perspective view of the backrest assembly applied to the chair same as the above. It is a side view of the receiving material applied to the chair same as the above. It is a front view of the receiving material applied to the chair same as the above. It is a rear view of the receiving material applied to the chair same as the above.

(1) Chair
(2) Caster
(3) Leg
(4) pedestal
(5) Support base
(6) Seat
(7) Backrest
(8) Backboard assembly
(9) Gas spring
(10) Cover member
(10A) Rear cover
(10B) Front cover
(11) dorsal fin
(11a) Vertical part
(11b) Horizontal part
(12) Connecting member
(12A) Back mounting attachment
(12a) Center part (locking part)
(12B) Intermediate material
(13) Axis
(14) Receiving material
(15) Opening
(16) Mounting hole
(17) Mounting hole
(18A) Back mounting hole
(18B) Gas bracket mounting hole
(19) Gas bracket
(20) Seat holder
(21) Seat frame
(22a) Rear axle
(22b) Front shaft
(23) Stage
(24A) Upper bent part
(24B) Lower bent part
(25) Engaging groove
(26) Cut
(27) Contact part
(28) Screw hole
(29) Contact part
(30) Screw hole
(31A) Upper bent part
(31B) Lower bent part
(32) Engagement groove
(33) Contact part
(34) Positioning recess
(35) Mounting hole
(36) Top plate
(37) Rib
(38) Contact part
(40) Mounting hole
(41) Window hole
(42) Locking piece
(43) Receiving part
(43a) Contact surface
(44) Shaft
(45) Mounting hole
(46) Recess
(47) Mounting hole
(48) Screw hole
(49) Screw hole
(50A) Mounting bolt
(50B) Nut
(51) Mounting screw
(52) Mounting screw
(53) Mounting screw
(54) Mounting screw

Claims (4)

A shaft suspended from a receiving portion in a receiving member having a contact surface that comes into contact with the rear surface of the backrest on the front surface side at the upper end opening of a pair of left and right dorsal fins formed by a tubular member standing from the rear of the seat By fitting the receiving parts to the upper ends of a pair of left and right dorsal fins , screwing each receiving material and the middle part in the vertical direction of the backrest, and the lower parts of the dorsal fins Are connected to each other by a connecting member, and a lower part of the backrest is brought into contact with a front surface of the connecting member, and a lower part of the backrest is fixed to the connecting member with an attaching screw penetrating the connecting member . Backrest mounting device. Backrest mounting system of claim 1 Symbol placement chair provided with a cover member to hide the connecting member covering the front and rear from the outside of the bottom of Ryose杆. Both dorsal fins have a horizontal portion and a vertical portion and are formed in an L shape in side view. In the bent portion of the L shape, each end portion of the connecting member extends over both the horizontal portion and the vertical portion. The chair backrest attachment device according to claim 1 or 2 , wherein the chair backrest attachment device is fixed by being let down. Gas for energizing the dorsal fins to stand between the support bases and the connecting members by attaching the front end portions of the lower parts of the dorsal fins to the support bases supporting the seats so as to be able to rotate in the vertical direction. The chair backrest attachment device according to any one of claims 1 to 3 , wherein a spring is provided.

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