JP3584412B2 - Chair tilting device for seat and backrest - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a tilting device for a seat and a backrest of a chair, which can be comfortably seated from a working posture to a comfortable posture and has a structure easy to assemble.
[0002]
[Prior art]
As a conventional tilting device for a seat and a backrest of a chair, for example, there is a device described in Japanese Patent Publication No. 2-24527.
Japanese Patent Publication No. 2-24527 discloses a horizontal support in which a front portion of a backrest is connected to a rear portion of a base frame by a shaft, a rear portion of a seat is connected to the backrest by a shaft, and the front portion of the seat is held. a shaft, and slidably coupled to a substantially horizontal elongate hole provided in the front portion of the base frame, sets the fulcrum of tilting movement of the seat in front of the seat, by solving the locking of the backrest pivoting and leans on the backrest, the backrest is pivoted back while pulling down the rear of the seat downward, the seat along with this is pulled backwards, the horizontal axis of the front part of the seat, the length of the base frame moved rearward along the hole, when the seat is in the inclined downward horizontal axis of the front which is moving as a fulcrum, without the front end of the seat almost rises, preventing floating of the legs This is the chair.
[0003]
[Problems to be solved by the invention]
In the chair described in Japanese Patent Publication No. Hei 2-24527, the base frame, the seat receiver, and the backrest frame are connected by a left-right axis at the time of assembling . First, assembling a retaining ring or the like for retaining the shaft requires a long time for assembly.
SUMMARY OF THE INVENTION An object of the present invention is to provide a tilting device for a seat and a backrest of a chair which can be easily assembled in view of the above problems.
[0004]
[Means for Solving the Problems]
The present invention employs the following means to achieve the above object.
(1) A base frame fixed to the upper end of the pillar supports a lower portion of the backrest frame having a backrest on the upper portion so as to be rotatable rearward, and has a seat on the upper portion in conjunction with the rotation of the backrest. in chair so as to slide back and forth a seat receptacle to the base frame, front Symbol seat seat receptacle includes a shaft in the lateral direction on the front, the said seat receptacle at its rear, front xenon-rest frame front of, are connected by a shaft directed in the lateral direction, and after presence on the front Kimoto frame, provided with two sets of U grooves facing the lateral direction, on the front Kimotowaku, Place the assembly assembled and the seat receptacle and backrest frame, around the U-groove before Kimoto frame, at the front before the shaft facing the lateral direction of the seat receptacle in Kia assembly, also the backrest frame each is fitted a shaft directed in the lateral direction, further, the mounting plate to be bonded thereon, and the upper surface of said base frame Incorporating in, assembling the base frame and the front Kia assembly, and with the base frame and the seat receptacle, slidably coupled.
[0005]
(2) In the previous section, the front and rear of the U-shaped groove of the upper surface of the base frame, respectively seen write set a U-shaped lower bearing, on top of the base frame, carrying the assembly assembled and the seat receptacle and backrest frame the more the cormorants upper part bearing the two axes before and after from the top, placed to fit on the lower bearing of, by screwing the mounting plate thereon, and a base frame and a previous Kia assembly Assemble.
[0006]
[Action]
Advance, with the set viewed seat receiving body and backrest frame, and the keep also mounted shaft, the one base frame, by providing two sets of U grooves facing the lateral direction around the upper surface, on a base frame, put the assembly assembled and the seat receptacle and backrest frame, assembled Luca et al., allows the assembled very easily.
Further, a shaft, by penetrating from the side of a plurality of parts (have multiple side walls.), Is cumbersome assembly, such as fitting the retaining ring becomes unnecessary. Placing the lower bearing and the upper bearing on the U-groove or shaft of the base frame is a simple task.
[0007]
Base frame that requires strength, molded in aluminum die casting or the like, the bearing, etc. to use the lubricating material having good, a proper use of a suitable material is available, cost-is also advantageous.
[0008]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
In the figure, reference numeral (2) denotes a leg of a chair, and casters (4) are attached to a plurality of tips (usually 4 to 5) of the chair so that the chair can move on the floor while sitting. (6) is a leg (2) is fixed upright on the pedestal, in its interior, Yes accommodates a known gas spring (8), by operating the gas spring (8), a pillar the height or the height of the seat end is adjustable on the (6), so that it can be fixed at any height.
Operation of the gas spring (8) is a push valve (10) in its end, is performed by pushing through a cable (12) and the lever (14).
[0009]
(16) is a base frame fixed to the upper end of the pillar (6) (the upper end of the gas spring (8)).
It has a box shape that opens upward as a whole. The shape of the base frame (16), there are features of the present invention in structure, the assembly of the seat receptacle and the backrest frame to the base frame (16), and the extremely easy.
[0010]
The upper surface of the left and right side walls of the base frame (16), two pairs of U-groove before and after to hold the shaft facing the lateral direction.
One set is a U-groove (18) (FIG. 5) provided in the upper rear part of the base frame (16) . The lower bearing (20), the upper bearing (22), and the base frame (16) have a U-shaped cross section . ) together with the mounting plate to the upper surface and the bonding of the (24) that holds the shaft rotatably. Another set of U-groove (26) is provided on the front of the base frame (16), a groove before the Ru extends diagonally behind downward, two lower bearing (28), 2 number of the upper bearing (29), the mounting plate with (24), the shaft (32), it is slidably held diagonally behind downward from the front on.
[0011]
(30) is a backrest frame, which is bent approximately in a forward L-shape when viewed from the side, and a backrest (not shown) is fixed on an upper portion thereof, and a lower end has a left-right axis ( 32) is fixed. By holding the shaft (32) in the U-groove (18) provided in the upper rear part of the base frame (16), the backrest frame (30) uses this as a fulcrum, and Can be rotated (tilted).
The middle of the longitudinal direction of the lower portion of the backrest frame (30), the axis of the pair projecting horizontally outward (68) is provided.
[0012]
(34) is a gas spring, the both ends of which are a shaft (38) inserted into the hole (36) in the rear lower part of the base frame (16) in the left and right direction, and a lower rear end of the backrest frame (30). The shaft (42) penetrated in the left and right direction through the hole (40) of the part (bent corner) is rotatably held, and is moved backward by the rotation of the backrest frame (30) with respect to the base frame (16). Is adjustable and can be fixed at any angle .
Operation of the gas spring (34) is a push valve (44) in its end, is performed by pushing through a cable (46) and a lever (48).
[0013]
A seat receiver (50) has a seat (not shown) on the upper part thereof. The seat receptacle (50), in conjunction with rearward rotation of the backrest frame (30), the movement tilts backward while moving backward. There are three connections between the base frame (16), the backrest frame (30) and the seat receiver (50) to cause the seat receiver (50) to do this movement. The description will be made in the following order.
[0014]
Rear part of the lower and rear are opened, the rear of the facing on the inside of the left and right side walls, opposing pair of left and right bearings of the seat receptacle (50) of the seat receptacle (50) (52) (54) is attached. The rear of the opposite left and right side walls of the seat receptacle (50) is provided so as to front and rear two pairs of holes (56) (58) is Akerare, protrudes from the outer side surface of the bearing body (52) (54) By fitting the front and rear shafts (60) and (62) into the holes (56) and (58) , respectively, a pair of left and right bearing bodies (52) and (54) are attached to the seat receiver (50). is there.
[0015]
The seat receiver (50) is made of, for example, aluminum die-casting because the shape is complicated and requires strength. , Molded with synthetic resin or the like.
[0016]
The front portion of the opposing inner surface of the bearing body (52) (54), elongated groove and a pair of rear side is opened downward tilted down (64) is likewise in the rear, the rear side is inclined obliquely upward long groove of a pair of upwardly opening (66) that is provided.
[0017]
The assembly sequence, after first incorporating the bearing body (52) (54) on the seat receptacle (50), incorporating a backrest frame (30) to Re it. In this case, the left and right shafts (32) fixed to the lower end of the backrest frame (30) are fitted into the pair of long grooves (64) at the front of the bearing bodies (52) and (54). A pair of shaft portions (68) projecting right and left outward in the lower middle of the backrest frame (30) fits in the pair of long grooves (66) at the rear.
These front and rear shafts at the lower part of the backrest frame (30) are slidably held by two pairs of long grooves (64) and (66) of the bearing bodies (52) and (54), respectively , as shown in FIG. The connecting portions (A) and (C) are formed. The axis of the connecting portion (A) (32) are assembled to the base frame (16), it becomes the fulcrum of rotation of the backrest frame (30), already mentioned.
[0018]
Further, a left-right axis (70) is fixed to a front portion of the seat receiver (50).
Seat receptacle (50) and backrest frame the assembly (30), when the mounting for partnering to base frame (16), the front axis of the seat receptacle (50) (70), the base frame (16 ), The shaft (32) of the connecting portion (A) of the assembly of the seat receiver (50) and the backrest frame (30) at the center is fitted to the base frame ( Fit into the U-groove (18) at the upper rear part of (16). The lower bearings (20), (28), (28) are fitted in the U-groove (18) and the U-groove (26) in advance.
[0019]
Then, by placing the upper bearing (22) (29) (29) and mounting plate (24), if screwed to the base frame (16), the base frame (16), backrest and seat receptacle (50) The frame (30) can be assembled . In this state, the front shaft (70) of the seat receiver (50) is slidably held in the front U-groove (26) of the base frame (16), and the third connecting portion (FIG. 6 (B)).
The connecting portions (A) and (B) both hold the seat receiver (50) so as to slide obliquely from the upper front to the lower rear with respect to the base frame (16). The inclination angle of the connecting portion (B) is set smaller than that of the connecting portion (A).
[0020]
As described above, by providing the three connecting portions (A), (B), and (C) between the base frame (16), the backrest frame (30), and the seat receiver (50), Such actions and effects are produced.
[0021]
First, the seat is made to rotate back around the vicinity of the seated person's pelvis (P point of Fig. 6) relative to the backrest, the relative movement of the seat and backrest are seated person Is very close to the relative movement between the thigh and the back. For this reason, between leading to the comfortable position from office posture, the movement of the movement and the backrest of the back without it occurs shift, there is no possibility that Makureru seated person's shirt. The sitting comfort is also good.
[0022]
In addition, even in the chair leaning seat and the back is continuous, the load of the expansion and contraction in the cushion material and the skin material is not applied between the rest seat and back. There is no damage to the cushioning material or the skin material due to the load of expansion and contraction when rotating behind the backrest.
[0023]
Second, when looking at the movement of the foot , the center of movement of the seat is close to the position of the ankle of the seated person (point Q in FIG. 6) , and the thigh of the thigh centered on the ankle of the foot is positioned. because closer to the movement while the slope of the backward, pulling from the knee to the upper side of the lower leg portion of the lower I almost cry, bending angle of the knee also Hiroga Ri, comfort is comfortable.
[0024]
At a position before the shaft (70) of the seat receiver (50), a tilting and cushioning device for the backrest is incorporated.
Reference numeral (72) denotes a pair of compression springs provided in the front-rear direction and separated from each other, and the front and rear ends thereof are held by a front spring receiver (74) and a rear spring receiver (76). The rear spring receiver (76) is held on the front wall of the base frame (16). The front spring receiver (74) has an opening (78) that opens downward at the center in the left-right direction.
[0025]
Cross-section the front viewed from the front of the seat receptacle (50) has a U-shaped upwardly opened, the inner surface of the right and left side walls and a bottom wall, and side surfaces of the front spring receiving body (74) bottom and is slidably held on the front and rear.
[0026]
The seat receiver (50) has a front wall (80) standing upright at the front end thereof, and a wedge-shaped adjustment piece () sandwiched between the front wall (80) and the front spring receiver (74). 82) is provided . The wedge-shaped adjusting piece (82) has its front surface slidably held up and down by the front wall (80) of the seat receiver (50). The mating surface of the front spring receiver (74) and the wedge-shaped adjusting piece (82) is a slope that faces from the lower front to the upper rear.
[0027]
The front spring receiver (74) and the wedge-shaped adjustment piece (82) constitute a wedge mechanism, and when the wedge-shaped adjustment piece (82) is moved downward, the front spring receiver (74) When the wedge-shaped adjustment piece (82) is moved upward against the urging force of the compression spring (72), the front spring receiver (74) is moved forward by the urging force of the compression spring (72). Go to
[0028]
Wedge adjuster piece (82), the arm portion extending rearwardly through an opening of the front spring receiving body (74) and (78) have (84) on the end after the arm (84), A female screw (86) penetrating vertically is provided, and a male screw (90) of a handle (88) for vertically operating the wedge-shaped adjusting piece (82) is fitted to the female screw (86). Position of the external thread (90) of the handle (88), when viewed from above, lies between a pair of compression springs (72).
[0029]
The seat receiver (50) has a stepped hole (92) formed by connecting a small hole in front and a large hole in rear at the front bottom wall thereof for holding the handle (88). The shaft of the handle (88 ) has a pair of flanges (94), which are smaller in diameter than the large-diameter hole of the stepped hole (92), larger in diameter than the small-diameter hole, and are separated from each other vertically. A shaft portion (96) having a smaller diameter than the small diameter hole of the stepped hole (92) is provided between the flanges (94), and the above-described male screw (90) is provided at the tip end side of the shaft portion.
[0030]
Assembly of the handle (88) relative to the seat receptacle (50) is inserted from below the shaft portion of the handle (88) to the large-diameter hole of the stepped hole (92), shifted laterally, if One pair ( 94) sandwich the bottom wall of the seat receptacle (50) from above and below, one if the shaft portion (96) between (94), may be be fitted into the small diameter hole, thereby the handle (88) The seat receiver (50) can be rotatably held.
[0031]
The function of the backrest tilting shock absorber configured as described above is as follows.
The pair of compression springs (72) have their rear ends held by the front wall of the base frame (16), and urge the seat receiver (50) forward through a wedge mechanism.
Since the seat receiver (50) is connected to the backrest frame (30) by the connecting portion (C) in the front-rear direction, the urging force of the compression spring (72) applies the force to the seat receiver (50). In this way , the backrest frame (30) acts so as to cause its inclination to the front, and together with the gas pressure of the gas spring (34), acts as a resistance force when the backrest is inclined backward, that is, a cushioning force. However, since the gas pressure of the gas spring (34) is constant, the only thing that can adjust the buffering force is the force of the compression spring (72), and the force of the compression spring (72) is controlled by the wedge mechanism and the handle (88). It is adjusted by the operation of the.
[0032]
【The invention's effect】
The present invention exhibits the following effects by adopting the above configuration.
Before and after the upper surface of the base frame, since is provided with two pairs of U-shaped groove facing in a lateral direction, first, set the seat receiving body and backrest frame, seat from mounting also axes, on a base frame receiving body and put the assembly assembled with the backrest frame, can be assembled, allows the assembled very easily.
Therefore, the shaft is penetrated from the side of a plurality of parts (having a plurality of side walls),
Is assembled troublesome, such as fitting the snap ring becomes unnecessary.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a working state of a chair according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional side view of the chair shown in FIG. 1 in a comfortable state.
FIG. 3 is an enlarged vertical sectional side view of a main part of the chair shown in FIG. 1;
FIG. 4 is an enlarged plan view of a main part of the chair shown in FIG.
FIG. 5 is an exploded perspective view of a main part of the chair shown in FIG.
6 is an explanatory view of movement of each part when the backrest of the chair shown in FIG. 1 is tilted.
[Explanation of symbols]
(6) Pillar
(16) Base frame
(18) (26) U-groove
(20) (28) Lower bearing
(22) (29) Upper bearing
(24) Mounting plate
(30) Backrest frame
(32) Backrest frame axis
(50) Seat receiver
(70) Front axle of seat receiver

Claims (2)

A lower part of a backrest frame having a backrest on an upper part is rotatably held rearward on a base frame fixed to an upper end of a pillar, and a seat receiver having a seat on an upper part in conjunction with the rotation of the backrest. In a chair that slides back and forth with respect to the base frame,
Before Symbol seat seat receptacle includes a shaft in the lateral direction on the front, the said seat receptacle at its rear, the front portion of the front dress rest frame are connected by a shaft directed in the lateral direction, and after presence on the front Kimoto frame, provided with two sets of U grooves facing the lateral direction, on the front Kimotowaku, carrying assembly assembled the seat receptacle and backrest frame, before Kimoto frame before and after the U-shaped groove, before the shaft facing the lateral direction of the seat receptacle in Kia assembly causes also fitted respectively an axis oriented in the lateral direction at the front of the backrest frame together further thereon, said base by incorporating a mounting plate joined with the upper surface of the frame, assembling the base frame and the front Kia assembly, with the base frame and the seat receptacle, the seat and back of a chair, characterized in that the slidably coupled to A device for tilting the back. Before and after the U-shaped groove of the upper surface of the base frame, respectively seen write set a U-shaped lower bearing, on top of the base frame, carrying the assembly assembled and the seat receptacle and backrest frame, two further said longitudinal to be cormorant upper portion bearing the shaft from the top of, placed to fit on the lower bearing of, by screwing the mounting plate thereon, and characterized by assembling the base frame and the previous Kia assembly The tilting device for a seat and a backrest of a chair according to claim 1, wherein

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