JPH0620409B2 - Chair - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a backrest plate tilts in response to a seated occupant's rearward tilt and the seat plate moves back and forth.

[Conventional technology]

Conventionally, a chair in which the backrest plate tilts back and forth and the seatboard slides horizontally from the initial state without load is already known, but the tilting of the backrest plate and the sliding of the seatboard are independent of each other. It worked. In these conventional chairs, a backrest rod having a backrest plate connected to the upper end is pivotally attached to the lower surface of the seat part, and the backrest plate is always tilted forward to support the seated person's backward tilt. The rod is elastically biased by a coil spring to adjust the strength of the spring according to the seated person.However, when the weight difference of the seated person is large, the tilting angle of the backrest plate varies greatly. It is necessary to adjust the strength of the spring each time, and there is a problem when it is used by an unspecified number of people. Also, with a chair in which an elastic body that elastically supports the backrest plate is embedded inside the backrest rod or seat, it is adjusted to standard specifications at the time of factory shipment, and it is impossible for the seated person to adjust from the outside, It also had the above-mentioned problems. Therefore, a chair whose resistance to tilting back of the backrest plate changes according to the weight of the seated person, that is, a seated person with a heavy weight has a large resistance to a tilted back and a seated person with a light weight. The advent of smaller chairs was desired.

[Problems to be Solved by the Invention]

In view of the above situation, the present invention is to solve the problem that the resistance force to the rearward inclination of the backrest plate automatically changes according to the weight of the seated person, and the seat can always be stably seated. The purpose of the present invention is to provide a chair in which the tilting of the backrest plate and the slide movement of the seat plate are effectively linked to each other.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention arranges a moving member having a seat plate attached to the upper surface in a substantially parallel manner to the upper part of a frame that can be attached to a footrest, and to the front end of the frame. On the other hand, the front end of the moving member is connected to each other by a long hole and a support shaft or a link member so that the front end of the moving member can move backward, and the rear end of the moving member moves backward and upward with respect to the rear end of the frame. As described above, an operating piece integral with or separate from the backrest rod is provided at a position slightly above the lower end pivot point of the backrest rod whose lower end is pivotally attached to the rear end of the frame, and the tip of the operating piece is the moving member. The spring means is rotatably associated with the rear end portion and elastically biases the frame in a direction in which the front end portion of the moving member moves forward and the rear end portion moves forward and downward with respect to the frame. The backrest is provided between the frame and the moving member. Seat plate with the inclination is what and rear moves backward is moved upward after.

[Action]

In the chair of the present invention having the above contents, when the seated person is seated on the seat board and the tilting force to the back is not applied to the backrest board, that is, the backrest rod, the frame and the moving member are supported by each other. In relation to the seat, a stable seated state is provided to the seated person by the support by the long hole and the support shaft or the link member in the front, and the support by the rear operating piece and the spring means, and the seated person leans backward on the backrest rod. When the backrest plate is leaning on the backrest plate, the rear end of the moving member is moved backward and upward by the operating piece located at the lower end of the backrest rod as the backrest rod tilts backward. And the front end of the moving member moves rearward with respect to the front end of the frame, possibly rearward and upward, or slightly downward to overcome the weight of the occupant and move. Prolong Or, if necessary, compressing the seated occupant's rearward tilting to adjust the rearward tilting resistance of the backrest rod according to the weight of the seated person, and further, to adjust the seating board's rearward tilting force according to the rearward tilting movement of the backrest rod. The positions are linked to each other to increase the stability of sitting of the occupant.

〔Example〕

Next, the details of the present invention will be described based on the embodiments shown in the accompanying drawings.

FIG. 1 shows a typical embodiment of a chair according to the present invention, and FIG. 2 is an exploded explanatory view showing the essential parts thereof. In the chair of the first embodiment according to the present invention shown in FIGS. 1 and 2, 1 is a frame, 2 is a moving member, 3 is a backrest rod, and 4 is provided on an upper end of the backrest rod 3. The backrest plate 5 is a seat plate fixed to the upper surface of the moving member 2. The frame 1 is a channel member having a substantially U-shaped cross-section and having upward openings having compatible walls 6 and 6. The moving member 2 is arranged above the frame 1 so as to be substantially parallel to the front end wall 6 of the front end portion of the frame 1. Has its tip folded back inward, and the tip of the folded piece is further bent upward to form a standing piece 7. A hole 9 for inserting a support shaft 8 is provided in this standing piece 7, and the moving member is Similarly to the frame 1, both side plates 10.10 are set at the same width as the standing wall 6 and the front end portion is extended downward to form a hanging piece 11, which is the standing piece 7. It is located on the outer side of the so that it can be externally fitted, and the hanging piece 11 is provided with a long hole 12 as shown in the drawing, and an annular guide member 13 is fitted into the long hole 12. The hanging piece 11 of the moving member 2 is externally fitted to the outside of the standing piece 7 of the frame 1, and the support shaft 8 is attached by penetrating the elongated hole 12 and the hole 9 of the standing piece 7 to attach the frame 1. The front end of the moving member 2 is connected to the front end so as to be movable back and forth. The relationship between the elongated hole 12 and the support shaft 8 is that the elongated hole 12 is provided on the frame 1 side, and
Can be provided on the side of the moving member 2 without any problem.

Next, at the rear end of the frame 1, the lower end of the backrest rod 3 having the backrest plate 4 on the upper end as shown in the figure is fixed to the lower end of the supporting shaft 14 and the hole 15.
Is pivoted by. In order to move the rear end of the moving member 2 located above the frame 1 back and forth in accordance with the back-and-forth movement of the backrest rod 3, it is located above and forward of the hole 15 which is the pivot point of the backrest rod 3. And a triangular actuating piece 17 for pivotally attaching to the rear end of the moving member 2 by a floating support shaft 16 is formed by extending both side walls 18 of the backrest rod 3 and located at the apex thereof. A hole 19 for pivotally attaching the floating support shaft 16 is formed. That is, the moving member 2 can be moved back and forth with respect to the frame 1 by the support shaft 8 and the elongated hole 12 at the front end portion, and the backrest rod 3 and the moving member 2 at the rear end portion. The rear end portion of the moving member 2 is set to be movable rearward and upward by the operating piece 17 provided integrally with the moving member 2. In the figure, 20 is an arbitrary stopper for defining the position where the backrest rod 3 tilts forward, and 21 is a compression coil spring provided between the floating support shaft 16 and the frame 1.
Spring means for returning the moving member 2 to the unloaded position relative to the frame 1 is configured.

Thus, in such a chair according to the present invention, when the seated person is seated on the seat plate 5 as shown in FIG.
The front is supported by the relationship between the long hole 12 and the support shaft 8, the rear is supported by the stopper 20 provided at the lower end of the backrest rod 3, or the abutting relationship between the upper end of the frame 1 and the lower end of the moving member 2. When the occupant is supported and gives a stable seat to the occupant and the occupant leans backward, that is, the backrest plate 4
When a load is applied to the rear of the seat plate 5, the load of the seated person is applied to the rear part of the seat plate 5, and at the same time, the backrest rod 3 tilts rearward,
Since the floating support shaft 16 rotates upward and rearward about the fixed support shaft 14, the rear end of the seat plate 5 moves rearward and upward together with the free support shaft 16, and the front end of the seat plate 5 moves. Due to the relationship between the support shaft 8 and the elongated hole 12, the support shaft 8 moves rearward and upward, and a resistance force against the rearward inclination of the backrest plate 4 is automatically given according to the weight of the seated person, so that stable sitting can be provided. it can. Then, since the spring means using the compression coil spring 21 is stretched against this backward tilt, a certain limit is given to the backward tilt of the backrest rod 3, and in the state where the backward tilt of the seated person is released, The backrest rod 3 is returned to its original position by the pulling force of the compression coil spring 21, and at the same time the moving member 2 is moved.
That is, the seat plate 5 also returns to its original position. 22 in the figure
Is a mounting body for mounting the frame 1, and 23 is a pedestal for supporting the mounting body 22.

Next, the chair according to the present invention shown in FIGS. 3 and 4 is a second embodiment showing another modification of the first embodiment shown in FIGS. 1 and 2. That is, in the chair of the second embodiment, the forward movement and the backward movement are performed by the L-shaped link member. That is, the frame 1 is the first
Similar to the frame 1 of the embodiment, a channel-shaped member is used, and the front end of the moving member 2 is attached to the front ends of the compatible walls 6 and 6 so that the front end of the moving member 2 can move backward. Both members are connected by a front link member 24 as shown in FIG. That is, the front link member 24 has a cylindrical body 26 arranged at the upper end of an arm 25 having a substantially L-shape in side view and two ring bodies 27 arranged at the lower end, as shown in FIG. Has a gap and a notch at the lower end of the arm 25. Then, in order to attach the ring body 27 at the lower end of the front link member 24 to the front end standing wall 6 of the frame 1, a hole 28 is provided in the standing wall 6 and is pivotally attached by a fixed support shaft 29 of the illustrated example,
The upper end cylinder 26 of the front link member 24 utilizes the hole 30 'provided at the front end portion of the side plate 10 of the moving member 2 as shown in the figure,
26 is installed between the side plates 10 and 10 and is pivotally attached by a floating support shaft 30. Further, the rear end of the moving member 2 is attached to the rear end of the frame 1 by the rear link member 31. The rear link member 31 has a cylindrical body 33 provided at the lower end of a substantially L-shaped arm 32 as shown in the drawing, and two ring bodies 34 provided at the upper end with a space therebetween, and has a substantially L shape in a side view.
A through hole 35 is further provided at the intersection of the mold arms 32. Then, the lower end cylindrical body 33 of the rear link member 31 is installed in the rear end portion of the frame 1, and the hole 36 provided in the rear end standing wall 6 and the through hole 37 of the cylindrical body 33 in the rear link member 31 are used. And is pivotally attached by a fixed support shaft 38, and the two ring bodies 34 at the upper end are
Is mounted between the holes 39 provided in the rear end side plate 10 of the moving member 2 and pivotally attached by a floating support shaft 40 so that the rear end of the moving member 2 is fixed to the rear end of the frame 1. A floating support shaft 40 is provided so as to be rotatable back and forth around the support shaft 38. still,
In the figure, reference numeral 41 denotes a concave portion provided above the rear end portion of the standing wall 6 of the frame 1, and reference numeral 42 denotes a convex portion provided at the rear end of the moving member 2, through which the floating support shaft 40 penetrates. It is desirable to provide a hole 39 for this. The lower end of the backrest rod 3 is pivotally attached to the rear end of the frame 1 by a fixed support shaft 43 as shown in the figure, and is located slightly above and forward from the pivot point of the lower end of the backrest rod 3. 44 is provided, and this hole 44 and the backrest rod 3 and two operating pieces 17 which are separate members are interposed, and the operating piece 17 is pivotally attached to the through hole 35 of the rear link member 31 by the support shaft 45. The rear end of the operating piece 17 is pivotally attached to the hole 44 by another supporting shaft 46. The compression coil spring 21, which is spring means, is located at the lower end of the front link member 24.
By utilizing the spacing between the individual ring bodies 27, one end is hooked on the fixed support shaft 29, and the other end is configured by utilizing the spacing between the two ring bodies 34 located at the upper end of the rear link member 31. Is engaged with. The compression coil spring 21 includes a fixed support shaft 29 and a floating support shaft.
It is not always necessary to provide it between 40 and the moving member 2
May be provided directly between the frame 1 and the moving member 2 as long as they are provided in such a relationship that they return to their original positions,
Also, it may be provided in another part. In the figure
Reference numeral 47 is a stopper that restricts the front link member 24 from tilting forward.

Thus, when the seated person is seated on the chair according to the present invention, the front stopper 47 and the rear concave-convex portion 4 are provided.
A stable sitting state is provided by the supporting relationship of 1, 42 or the abutting relationship between the upper end of the compatible wall 6 of the frame 1 and the lower ends of the side plates 10 of the moving member 2, and when the seated person leans backward, That is, when the backrest rod 3 tilts rearward, the operating piece 17 pulls the through-hole 35 portion of the rear link member 31 rearward against the tensile force of the compression coil spring 21, so that the rear link member 31 is The floating support shaft 40 rotates around the fixed support shaft 38, and by this rotation operation, the rear end portion of the seat plate 5 moves while rotating rearward and upward, and the front end portion thereof moves upward and rearward. Moving. Therefore, when the weight of the seated person becomes large,
The load on the rear end portion of the seat plate 5 becomes large, and the tilting force when the backrest rod 3 leans against the seatback 5 is canceled by the load, and the tilting resistance to the rear is increased, and the backrest rod 3 with respect to the weight of the seated person is increased. When the tilting power to the backrest rod 3 is released, the compression coil spring 21 easily returns the backrest rod 3, that is, the backrest plate 4, to the original position. Of.

Next, the chair according to the present invention shown in FIGS. 5 and 6 shows a third embodiment, and the contents thereof are basically the same as those of the first embodiment and the second embodiment. However, the moving member 2 with respect to the frame 1 uses channel-shaped members as described above, and the rear end of the moving member 2 is bent slightly upward in an L shape. The front end portion of the moving member 2 is attached to the front end portion of the frame 1 by connecting two plate pieces 48, which are opposed to each other as shown in the drawing, in the middle so that the upper and lower portions of the front link member 49 are respectively connected to the frame 1. The movable member 2 is internally mounted at each front end, the lower end is pivotally supported by a fixed support shaft 50, and the upper end is pivotally supported by a floating support shaft 51. Is attached to the lower end of a link member 52 having one end pivotally attached to the upper end with the rear end of the frame 1 slightly raised, and attached to the lower end of the link member 52 by the pivot 52 ". Is provided at the position of the backrest rod 3 so as to integrally project with the backrest rod 3, and a pivot 54 is pivotally mounted between the tip of the operation piece 17 and the rear end bent portion 53 of the moving member 2. It will be. In addition, reference numeral 55 in the drawing forms a concave portion 56 in the middle bottom portion of the frame 1, accommodates the lower end thereof and is pivotally attached by a support shaft 57, and the upper end is a substantially T-shaped actuation between both side plates 10 of the moving member 2. It is a push spring that accommodates both ends of the rod 58, and projects both ends outward from the side plate 10 for pivotal attachment.

Thus, also in the case of the chair according to the third embodiment, when the seated person is seated on the seat plate 5, the seat plate 5 is stably supported while being supported by the supporting force of the push spring 55. , When the seated person leans on the backrest plate 4, the backrest rod 3
Tilts rearward, and the backrest rod 3 is moved according to the tilting motion.
Of the moving member 2 moves the rear end portion of the moving member 2 rearward and slightly upward, and at this time, the push spring 55 is erected or rotated backward while being rotated at the upper and lower pivot points in a compressed state. . At the front end thereof, the front link member 49 is tilted slightly rearward, so that the tilting power corresponding to the weight of the seated person and the load on the seat plate 5 are offset each other, and the backrest rod 3 causes The seat plate 5 is returned to its original position by the returning operation of the push spring 55, which is a spring means, when it is stably supported and when the seated person releases the tilt.

Finally, the fourth embodiment shown in FIG. 7 is slightly different from the chairs up to the third embodiment, but the substantial contents are the same. In the figure, 1 is a frame, and 2 is a moving member. As shown in the drawing, the moving member 2 with respect to the frame 1 has a semi-circular concave portion 59 on one side and a semi-circular convex portion 60 on the other side so that they can rotate relative to each other to form the semi-circular convex portion 60. A seat plate 5 is provided on the upper surface of the moving member 2.
The moving member 2 of 60 and the frame 1 having the semi-circular recess 59 are linked to each other by a long hole 61 and a guide support shaft 62 so that the moving member 2 can rotate in the frame 1. The lower end of the backrest rod 3 provided with a backrest plate 4 at the upper end is pivotally attached to the rear end of the frame 1, and the operating piece 17 separate from the backrest rod 3 is provided at a position slightly higher than the pivot point. The moving member 2 having the semicircular convex portion 60 is pivotally attached to one end thereof, and the other end is pivotally attached to the backrest rod 3. Reference numeral 21 in the figure denotes a compression coil spring provided between the frame 1 and the moving member 2.

Thus, in order to use the chair of the present invention according to the fourth embodiment, if the seated person is seated in the state shown in the figure, the semi-circular convex portion 60
When the seated state is supported by the fitting relationship between the recessed portion 59 and the recessed portion 59, and the seated person tilts rearward and leans on the backrest plate 4,
Since the backrest rod 3 tilts rearward, the moving member 2 is pulled up to the right in the figure by the operating piece 17 and rotates leftward, and the rear end portion of the seat plate 5 is upward and slightly rearward, and the front end portion thereof is Due to the relationship between the long hole 61 and the support shaft 62, the weight of the seated person and the tilting force due to the leaning load on the backrest rod of the seated person cancel each other out while leaning forward while slightly moving rearward to achieve a balance. As a result, the backrest rod 3 can be stably tilted at the same time as the seat is stabilized. When the tilt is released, the moving member 2 returns to its original position by the spring means.

As described above, each of the chairs shown in the first to fourth embodiments has a heavy weight and a light weight due to their respective mechanisms, so that it is not necessary to adjust the spring force of the backrest rod and the load applied to the seat plate and the backrest rod can be adjusted. The load applied to each other cancels each other to form a stable tilting support. However, each of these mechanisms, that is, the frame 1, the moving member 2, the backrest rod 3, the front supporting member, and the rear supporting member in the present invention is used. If a mechanical unit constituted by assembling a support member, spring means, etc. is formed as a mechanical unit M and standardly manufactured in various sizes and shapes in advance, various modes can be obtained as shown in FIG. 8 and FIG. It is possible to easily assemble the chair. That is, as shown in FIG. 8 (a), the leg 23 is formed of a pipe, and the same mechanical unit M, M (shown in a simplified manner) is fixed to both upper parts of the leg 23 to form a pipe. Chair, footrest 23 as shown in Figure 8 (b)
A rotary chair composed of a support shaft 22 rotatably connected to a support shaft, and the same mechanical units M and M fixed on both sides of the support member 22, further as shown in FIG. 8 (c). A mechanical unit M is provided on both sides of a mounting body 22 connected to a footrest 23 similar to that in FIG. 8 (b).
It is possible to easily construct a swivel chair or the like in which M is fixed, the backrest rods 3 are bent so as to approach each other from both sides, and the backrest plates are connected at the central portion. Here, in order to attach the seat plate 5 and the backrest plate 4 to the semi-finished product in the state shown in FIG. 8, for example, as shown in FIG. 9, the fitting grooves 63 opened downward on both sides of the seat plate 5 are provided. Further, by forming the fitting grooves 64 which are formed on the back surface of both sides of the backrest plate 4 and open rearward, the moving member of the mechanical unit M and the backrest rod 3 are fitted to each other, and further, on the back surface of the backrest plate 4. It can be easily assembled by fixing the back cover 65 with screws.

〔The invention's effect〕

According to the chair of the present invention as described above, a moving member having a seat plate attached to the upper surface in a substantially parallel to the frame is arranged above the frame that can be attached to the footrest, and the front end portion of the frame is provided. On the other hand, the front end of the moving member is connected to each other by a long hole and a support shaft or a link member so that the front end of the moving member can move backward, and the rear end of the moving member moves backward and upward with respect to the rear end of the frame. As described above, an operating piece integral with or separate from the backrest rod is provided at a position slightly above the lower end pivot point of the backrest rod whose lower end is pivotally attached to the rear end of the frame, and the tip of the operating piece is the moving member. The spring means is rotatably associated with the rear end portion and elastically biases the frame in a direction in which the front end portion of the moving member moves forward and the rear end portion moves forward and downward with respect to the frame. It is provided between the frame and the moving member and Since the seat plate moves rearward and the rear part moves upward due to the rearward leaning of the rod, when the seat plate is seated, the seat plate does not move and can be stably seated. When the backrest rod is leaning in this state, the rear end member of the moving member is moved rearward and upward by the operating piece provided at the lower end of the backrest rod. With respect to the load on the other side and the elastic force of the spring means, the moments when the backrest rod is tilted balance each other, and the resistance force to the rearward leaning of the backrest rod can be increased or decreased with the weight of the seated person. Even if the weight of the seated person is significantly different, it can be stably seated in a well-balanced state, and the backrest plate tilts extremely backward as in the case of a heavy person sitting like before. Not only does this not give the seated person an instability, but also pulling backwards. It is also of no chestnut return. In addition, since the rear end of the moving member is moved rearward and upward by the actuating piece provided slightly above the lower end pivotal attachment point of the backrest rod, the seated person leans back when leaning backward. The support by the plate surface and the seat plate surface does not form an unreasonable angle, and the seating is facilitated by giving an inclination adapted to the backward tilted posture of the seated person.

[Brief description of drawings]

FIG. 1 is a simplified vertical cross-sectional side view of a main part showing a typical embodiment of the present invention, FIG. 2 is an exploded perspective view showing the main part, and FIG. 3 is a simplified vertical side view of the second embodiment. FIG. 5 is an exploded view of the essential parts, FIG. 5 is a simplified vertical sectional view of the third embodiment, FIG. 6 is an exploded view of the essential parts thereof, and FIG. 7 is a simplified vertical side view of the fourth embodiment. (a), (b) and (c) are simplified perspective views of semi-finished products of various chairs configured by using a mechanical unit, and FIG. 9 is a simplified perspective view showing how a seat plate and a backrest plate are attached. 1: frame, 2: moving member, 3: backrest rod, 4: backrest plate, 5: seat plate, 6: standing wall, 7: standing piece, 8: support shaft, 9:
Hole, 10: side plate, 11: hanging piece, 12: long hole, 13: annular guide member, 14: fixed support shaft, 15: hole, 16: floating support shaft, 17: operating piece, 18: side wall, 19: hole , 20: stopper, 21: compression coil spring, 22: mounting body, 23: leg stand, 24: front link member,
25: Arm, 26: Cylindrical body, 27: Ring body, 28: Hole, 29: Fixed support shaft, 30: Floating support shaft, 31: Rear link member, 32: Arm, 33: Cylindrical body, 34: Ring body, 35: through hole, 36: hole, 37:
Through hole, 38: fixed support shaft, 39: hole, 40: floating support shaft, 41: concave part, 42: convex part, 43: fixed support shaft, 44: hole, 45: support shaft, 46:
Support shaft, 47: stopper, 48: plate piece, 49: front link member, 50: fixed support shaft, 51: floating support shaft, 52: link member, 5
3: Bent portion, 54: Support shaft, 55: Push spring, 56: Recessed portion, 57:
Support shaft, 58: operating rod, 59: concave portion, 60: convex portion, 61: long hole, 6
2: Support shaft, 63: Fitting groove, 64: Fitting groove, 65: Back cover.

Claims (1)

[Claims] 1. A moving member having a seat plate attached to the upper surface thereof is disposed above the frame that can be attached to the footrest so as to be substantially parallel to the frame, and the front end portion of the moving member is disposed with respect to the front end portion of the frame. The frame and the rear end of the frame are connected to each other by a support shaft or a link member so that the rear end of the moving member can move rearward and upward with respect to the rear end of the frame. An operating piece integral with or separate from the backrest rod is provided at a position slightly above the lower end pivot point of the backrest rod whose lower end is pivotally attached, and the tip of the operating piece is rotated to the rear end of the moving member. Provided between the frame and the moving member is a spring means that is freely associated with the frame and elastically biases the front end of the moving member forward and the rear end forward and downward with respect to the frame. With the back leaning of the backrest rod, Chair plate moved and rear portion rearward and characterized by being moved upward.