JPH0255008A - Chair - Google Patents

Abstract

PURPOSE:To permit the always stable taking-seat according to the body weight of a person on chair by installing a tilting member having a seat plate installed onto the upper surface and a shoulder lean-over plate which pivotally supports the upper edge of a connecting member and the erection part of a frame in the separated state in the longitudinal direction. CONSTITUTION:When a person takes a seat plate 10, the rear part of a tilting member 2 is pressed rearward, and a stress acts in the direction for forwardly tilting a shoulder lean-over plate 4 through a connecting member 3, and the forwardly tilting force increases more as the body weight is heavier. Therefore, a stable state is generated by the balance between the forward tilt of the shoulder lean-over plate 4 due to the body weight applied onto the seat plate 10 among the body weight of the person on chair and the rearward tilt of the shoulder lean-over plate 4 due to the rearward stress in the rearward tilt of the upper half body of the person on chair. In other words, the resistance force for the rearward tilt of the shoulder lean-over plate 4 increases and reduces according to the body weight of the body of the person on chair, and the comfortable taking-seat state for all the persons on chair can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a chair whose back slope tilts in accordance with the backward leaning of a seated person.

[Conventional technology]

A conventional chair with a backrest plate that tilts back and forth has a backrest rod connected to the upper end of the backrest plate, which is pivoted to the underside of the seat.
The backrest plate is always elastically biased by a coil spring in a direction in which the backrest plate tilts forward to support the backward tilt of the seated person, and the strength of the spring is adjusted depending on the seated person. However, if there is a large difference in the weight of the seated occupants, the tilt angle of the backrest plate will vary greatly, so the strength of the spring must be adjusted each time, which poses a problem when used by an unspecified number of people. there were. In addition, chairs that have an elastic body embedded inside the backrest rod or seat that elastically supports the backrest plate are articulated to standard specifications when shipped from the factory, and it is impossible for the seater to adjust them from the outside. This still had the above-mentioned problems. Therefore, the chair has a backrest plate whose resistance to tilting backwards changes depending on the weight of the seated person, in other words, the resistance to tilting is large for a heavy seated seated person, and the resistance against tilting is large for a seated seated person who is light in weight. There was a desire for a chair that would be smaller.

[Problem to be solved by the invention]

In view of the above-mentioned situation, an object of the present invention is to provide a chair in which the resistance force against the backward tilting of the back plate automatically changes according to the weight of the seated person, so that the seated person can sit stably at all times. It is in the point of providing.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a frame that is attached to a leg stand and has a horizontal part on which a seat plate is placed, an upstanding part that extends continuously upward at one end of the horizontal part, and a tilting member whose front end is pivoted to the front end of the section and a seat plate is attached to the top surface;
A connecting member is pivotally supported on the rear end of the tilting member and is disposed upward substantially parallel to the upright portion of the frame; The chair is composed of a backrest plate which is pivotably supported in a state of being spaced apart from each other.

Further, in order to increase the resistance force of the backrest plate against backward tilting and to quickly restore it to the normal position, the seatback plate is arranged between the appropriate front part of the backrest plate and the lower part of the upright part of the frame, or between the intermediate part of the connecting member and the frame. A tension coil spring was interposed between the lower part of the upright part.

[Effect]

In the chair of the present invention constructed as described above, when a rearward stress is applied to the backrest plate, the cough backrest plate tilts rearward about the pivot point at the upper end of the upright part of the frame, and In response, the connecting member pivoted to the front of the backrest plate is pulled up, and the tilting member whose rear end is pivoted to the connecting member is moved upward with its rear part pivoting about the pivot point to the front end of the horizontal part of the frame. Therefore, when a person is seated and a weight is applied to the seat plate, that is, the tilting member, the resistance force against the backward tilting of the backrest plate changes depending on the magnitude of the weight.

〔Example〕

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

FIG. 1 shows a typical embodiment of the chair of the present invention, in which 1 indicates a frame, 2 a tilting member, 3 a connecting member, and 4 a backrest plate.

The frame 1 is rotatably or non-rotatably attached to a normal leg stand 5, and has a horizontal part 6 and an upright part 7 that extends upward continuously from the rear end of the horizontal part 6, and has a It is formed into an abbreviated letter shape when viewed from the side.

The tilting member 2 has its front end pivotally supported by a horizontally disposed fixed support shaft 9 on a support piece 8 protruding from the upper surface of the front end of the horizontal portion 6 of the frame 1, and has a seat plate 10 on its upper surface. is attached and arranged substantially parallel to the horizontal portion 6.

Further, the connecting member 3 is disposed substantially parallel to the upright portion 7, and its lower end is connected to a floating support shaft 1 that is horizontal to the rear end of the tilting member 2.
It is supported by 1. Note that the connecting member 3 can be made of a rod, a plate, or a wire such as a piano wire that has sufficient strength against tensile force.

The backrest plate 4 pivots on a horizontal fixed support shaft 13 a mounting portion 12 fixed to the lower end or back surface, and also positions the upper end of the connecting member 3 at a predetermined position forward of the fixed support shaft 13. It is pivotally supported by horizontal floating support shafts 14 at intervals.

Therefore, when the backrest plate 4 is pushed backward, the upper part of the backrest plate 4 tilts rearward about the fixed support shaft 13, and the connecting member 3 is pulled up accordingly. , and the tilting member 2, whose rear end is pivoted to the lower end of the connecting member 3, lifts up at the rear about the fixed support shaft 9 at the front of the horizontal section 6 of the frame 1. When the user is seated on the seat, the rear part of the tilting member 2 is pressed downward, and stress is applied through the connecting member 3 in a direction that causes the backrest plate 4 to tilt forward, and the heavier the body weight, the more the forward tilting force increases. In this way, the forward inclination of the backrest plate 4 due to the weight of the seated person on the seat plate 10 is balanced with the 1 & inclination of the backrest plate 4 due to the backward stress that causes the seated person's upper body to lean backwards. In other words, the resistance force against backward tilting of the backrest plate 4 increases or decreases depending on the weight of the seated person, and an optimal seating condition can be realized for all the seated persons.

Of course, it is also possible to provide a stopper 15 between the horizontal part 6 of the frame and the tilting member 2 so that the rear part of the seat plate 10 does not sink unexpectedly when the user sits down.

Next, more specific examples of the present invention will be described.

The chair shown in FIGS. 2 and 3 has the main mechanism of the present invention as a unit, and this mechanism unit 16 is fixed to both sides of a mounting body 17 connected to the upper end of the leg base 5, and the upper part of the Both sides of the seat plate 10 are attached to the seat plate 10. Here, the frame 1 has a structure in which a beam-shaped rod having a U-shaped cross section is bent at the rear, and the upper edge of the compatible wall at the front end, which forms the horizontal portion 6, is extended upward from the inside in steps. A support piece 8.8 is formed, and a hole for horizontally mounting the fixed support shaft 9 is formed in each of them.Furthermore, the fixed support shaft 13 is mounted horizontally on the coexistence wall at the upper end portion which serves as the upright portion 7. Each has a hole for mounting. Further, the upper edge of the vertical wall at the rear of the horizontal portion 6 is bent inward to form a stopper 15.

In addition, the tilting member 2 has a vertical wall of a beam-shaped rod having a U-shaped cross section facing downward, and a front end vertical wall extending downward to form a connecting piece 18.18 that overlaps the supporting piece 8.8 from the outside. Holes are also formed at opposite positions of the connecting piece 18 and the compatible wall at the rear end, respectively, through which the fixed support shaft 9 and the floating support shaft 11 are inserted horizontally. A fixing screw hole is formed, and the center portion of the upper surface of the rear end portion is cut out to form the floating portion 19 of the connecting member 3.

The connecting member 3 is made of a beam-shaped rod having a U-shaped cross section, and has floating support shafts 11 and 1 mounted on coexisting walls at the upper and lower ends, respectively.
4 is formed into a hole through which it can be inserted.

On both sides of the backrest plate 4, connecting portions 20 are formed with holes spaced apart from each other in the front and back through which the fixed support shaft 13 and the floating support shaft 14 can be inserted. Although the mounting portion 12 having the portion 21 is fixed, it is possible to form the mounting portion 12 integrally with the backrest plate 4 in advance.

Furthermore, as shown in FIG. 3, a locking part 22 is provided at the lower end of the upright part 7 of the frame 1 by welding or cutting the frame 1,
One end of the tension coil spring 23 is locked to the locking part 22, and the other end is locked to the floating support shaft 14 which pivotally supports the mounting part 12 and the connecting member 3, so that the backrest plate 4 is The backrest plate 4 is elastically biased in the direction of tilting forward about the fixed support shaft 13 to adjust the resistance force against the backward tilting of the backrest plate 4, and to quickly restore its original position when tilted backward. In addition, by installing the tension coil spring 23, the backrest plate 4
This serves to prevent the backrest plate 4 from tilting excessively backwards in the event that the user suddenly leans back.

Furthermore, in the frame shown in FIG. 4, the upright portion 7 of the frame 1 is formed into a cylindrical shape, and the connecting member 3 and the tension coil spring 23 are housed inside the frame 1, thereby improving the appearance. ,
One end of the coil spring 23 is locked to the locking portion 22 at the lower end of the upright portion 7 as described above, and the other end is locked to the intermediate portion of the connecting member 3. Further, unlike the previous embodiment, the support piece 8 and the connection piece 18 are not provided, and the fixed support shaft 9 is directly passed through the horizontal portion 6 of the frame 1 and the vertical wall of the tilting member 2. Therefore, the mechanical unit 16 as a whole is compact and has an excellent appearance.

Furthermore, the one shown in FIG. 5 is of a type in which the width of the mechanical unit 16 is increased and only one is provided in the center of the chair, and is basically the same as the above-mentioned one, but in the horizontal part. 6 is shaped like a box with an upward opening, and the tilting member 2 is accommodated therein, and the mounting plate 24 of the seat plate 10 is fixed to both sides of the tilting member 2 by protruding from the horizontal part 6. This also has the function of the stopper 15.

The one shown in FIG. 6 uses a wire rod as the connecting member 3. One end of this wire rod is connected to a fixed support shaft 9 at the front end of the horizontal section 6 of the frame 1, and the other end is connected to the fixed support shaft 9 at the front end of the horizontal section 6 of the frame 1. It is connected to a portion corresponding to the floating support shaft 14 provided on the back plate 4, and is elastically biased by a coil spring 23 in the same manner as described above.

Note that the mechanical unit 16 as shown in FIGS. 3 and 4
By manufacturing chairs according to several standards, it becomes possible to easily assemble chairs of various types.

That is, as shown in FIG. 7(al), the foot stand 5 is formed of a pipe, and the same mechanical units 16.
16 (shown in a simplified manner), the mounting body 17 is rotatably connected to the support shaft 25 of the footrest 5 as shown in FIG. A rotary chair constructed by fixing a mechanism similar to the one described above (Uniso) 16. Uni 7
A rotary chair, etc., in which the frame 1 and the connecting member 3 are bent so as to approach each other from both sides, and the backrest plate 4 is connected at the center. , can be easily configured. Here, in order to attach the seat plate 10 and the backrest plate 4 to the semi-finished product in the state shown in FIG. 7, for example, as shown in FIG. In addition, by forming rear-opening fitting grooves 27 on both back sides of the backrest plate 4, the fitting grooves 27 can be fitted into the tilting member 2 and the upright part 7 of the mechanism unit 16, respectively, and furthermore, the fitting grooves 27 can be formed on the back side of the backrest plate 4. The back cover 28 can be easily assembled by fixing it with screws.

〔Effect of the invention〕

According to the chair of the present invention made as described above, it can be attached to a leg stand,
A frame having a horizontal part that serves as a seat plate and a standing part extending upward continuously from the rear end of the horizontal part, the front end being pivoted to the front end of the horizontal part, and the seat plate being mounted on the upper surface. a tilting member to be attached; a connecting member pivotally supported on the rear end of the tilting member and disposed upward substantially parallel to the upright portion of the frame; an upper end of the connecting member and an upper end of the upright portion of the frame; Since the backrest plate is pivoted with the parts spaced apart from each other in the front and rear positions, the resistance force against the backward tilting of the backrest plate, that is, the forward tilting, increases depending on the weight of the person seated on the seat plate. The restoring force that acts in the direction of Not only does it not lean backwards excessively and give the seated person a sense of instability, it also does not overturn later.

In addition, by elastically biasing the backrest plate in the forward tilting direction using a tension coil spring, it is possible to prevent the backrest plate from inadvertently tilting backward when the user leans against the backrest plate while not seated. At the same time, it is possible to subtly correct and adjust the balance due to body weight.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view showing a typical embodiment of the present invention;
The figure is an exploded perspective view of the main parts of the chair of the present invention, which is more specific.
Figure 3 is the same (a vertical cross-sectional side view of the main part in the assembled state, Figure 4 is a vertical cross-sectional side view of the main part showing another embodiment, and Figure 5 is a partially cutaway view of another embodiment). FIG. 6 is a perspective view with some of the main parts omitted; FIG. 6 is a simplified side view showing another embodiment; FIG.
Figure (al~) (C1 is a simplified perspective view of a semi-finished product of various chairs constructed using mechanical units, and Figure 8 shows how the seat plate and backrest plate are attached to the chair in the state shown in Figure 7. It is an omitted perspective view. 1: Frame, 1 (IJ moving member, 3: Connecting member, 4: Backrest plate, 5: Leg stand, 6: Horizontal part, 7: Standing part, 8: Support piece, 9: Fixed spindle, 10: Seat plate, 11: Floating spindle, 12
: Mounting part, 13: Fixed support shaft, 14: Floating support shaft, 15: 18: Part, 25: Stopper, 16: Mechanism unit, 17: Mounting body, connection piece, 19: Floating part, 20: Connection part, 21 : Mounting 22: Locking part, 23: Coil spring, 24: Mounting plate, spindle, 26:
Fitting groove, 27; Fitting groove, 28: Back cover Figure Figure Figure Figure Figure

Claims (1)

[Scope of Claims] 1) A frame that is attached to a leg stand and has a horizontal part on which a seat plate is placed, and an upright part that extends upward continuously from the rear end of the horizontal part, and a front end of the horizontal part. a tilting member whose front end is pivoted to the front end thereof and a seat plate is attached to the upper surface thereof; a connecting member which is pivoted to the rear end of the tilting member and arranged upward substantially parallel to the upright portion of the frame; A chair comprising: a backrest plate formed by pivotally supporting an upper end of a connecting member and an upper end of an upright part of the frame in a state where they are spaced apart from each other in front and rear positions; 2) The chair according to claim 1, wherein a tension coil spring is interposed between a proper position in front of the backrest plate and a lower part of the upright part of the frame. 3) The chair according to claim 1, wherein a tension coil spring is interposed between the intermediate portion of the connecting member and the lower part of the upright portion of the frame.