JPH0255006A - Chair - Google Patents

Abstract

PURPOSE:To permit the always stable taking-seat by installing a pressing means which relates the lower edge of a shoulder lean-over rod with the position under the pivotal supporting point of a tilting member and springily urges the both in the separating direction by a compression coil spring and permitting the resistance force for the rearward tilt of the shoulder lean-plate to automatically vary according to the body weight of a person on chair. CONSTITUTION:When a force is applied rearward onto a shoulder lean-over plate 24, a shoulder lean-over rod 3 pivotally supported onto the rear edge of a frame 1 by a fixed supporting shaft 9 turns around the fixed supporting shaft 9 against the springy force of the coil spring 28 of a pressing means 5 installed at the lower edge of the shoulder lean-over rod 3, and the rod body 31 of the pressing means 5 projects furthermore from a through hole 17. Then, a balance state with the springy force of the coil spring 28 which is compressed between a cylindrical body 30 and a stop plate 16 is generated. Further, when a large stress is applied rearward onto the shoulder lean-over plate 24, a free supporting shaft 26 installed onto a connecting plate 25 as connecting part 4 continuously installed at the lower edge part of the shoulder lean-over rod 3 collides with the upper edge of a slot hole 14 of a tilting member 2, and the front part of the tilting member 2 acts in the downward revolution direction, and compresses the compression coil spring 28 of the pressing means 5, and stops at a balanced position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chair in which a backrest plate 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 1 & 2 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 adjusted 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 resistance force against the back of the backrest plate changes depending on the weight of the person sitting on the chair.In other words, the resistance force against tilting backwards is large for a person who is heavy, and the resistance force against tilting back is large for a person who is light 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 of the backrest plate against 1kW4 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 doing.

[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, has a substantially U-shaped cross section that opens at least upwardly, and has a compatible wall, and a rear part of the frame is pivoted to the compatible wall at the rear of the frame by a fixed support shaft. At the same time, a long hole is formed in both side plates at a position rearward from the pivot point, and a tilting member for attaching the seat plate to the upper surface, and a lower part fixed to the supporting wall at the rear end of the frame are formed. A backrest rod that is pivotally supported by a shaft and a backrest plate is attached to the upper part; one end is linked to the lower end of the backrest rod, and the other end is pivotally connected to the elongated hole of the tilting member by a floating support shaft. and a pressing means that associates a position below the pivot point of the tilting member with the lower end of the backrest rod, and elastically biases the two with a compression coil spring in a direction in which they are separated. Constructed a chair.

Further, as a specific structure of the connecting portion, a connecting plate is used, which is formed by extending the lower end of the backrest rod and protruding forward.

Further, as the connecting portion, a connecting rod is used which is pivotally attached to the lower end of the backrest rod by a floating support shaft.

[Effect]

In the chair of the present invention having the above-mentioned contents, when a seated person sits on the seat plate, the front part of the tilting member sinks downward about the pivot point which is pivoted to the compatible wall of the frame by a fixed pivot. At the same time, the compression coil spring of the pressing means provided between the position below the pivot point and the lower end of the backrest rod is compressed, and if rearward stress is applied to the backrest plate in this state, it is fixed to the rear end of the frame. The backrest rod, which is pivotally supported by the support shaft, rotates around the pivot point and tilts backward against the elastic force of the coil spring of the pressing means associated with the lower end of the backrest rod. , the elastic force of the coil spring is balanced, and if a large rearward stress is applied to the backrest slope, the floating support shaft of the connection part provided in relation to the lower end of the backrest lever will change the length of the tilting member. When it hits the upper end of the hole, the front part of the tilting member is rotated downward, further compressing the compression coil spring of the pressing means and resting at the balanced position. In other words, 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 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.

1 and 2 show typical embodiments of the chair of the present invention, in which 1 is a frame, 2 is a tilting member, 3 is a backrest lever, and 4 is a
Reference numeral 5 indicates a connecting portion, and 5 indicates a pressing means.

The frame 1 consists of an upwardly opened box with a substantially U-shaped cross section and compatible walls 6, 6 near the center of the rear part.
A hole 8.8 through which the fixed support shaft 7 can be inserted horizontally is formed in the upper part of the hole 8.8, and a second fixed support shaft 9 is inserted horizontally into a portion where the compatible wall 6.6 at the rear end is extended upward. Obtaining hole 10.1
0 is formed.

The tilting member 2 has a projection 12 formed by projecting the rear portions of the side plates 11 and 11 downward, and has a size and shape that allows its lower half to be housed inside the frame 1. 11
．． 11 is formed with a through hole 13.13 through which the fixed support shaft 7 is inserted, and at the rear of the through hole 13, which serves as a pivot point, a hole is formed on both side plates 11.11 at a circumference approximately equidistant from the through hole 13. A long hole 14.14 is formed at a position along the protrusion 12.
A locking portion 15 is formed at the lower end between the side plates 11 and 11, and the rear thereof is open so that a pressing means 5, which will be described later, can be attached. In this embodiment, the locking portion 15 is located on both side plates 11. of the box-shaped protrusion portion 12 that is open at the rear.
At the same time as fixing the stop plate 16 between 11 and the corresponding stop plate 16
A through hole 17 is bored in the center of the hole.

Then, the frame 1 is fixed in parallel to both sides of an arm-shaped mounting body 19 connected to the upper end of the leg stand 18,
A seat plate 2o can be fixed to the upper surface of the tilting member 2.

In addition, the backrest rod 3 is made of a long rod, and in this embodiment, a through hole 21, 21 through which the fixed support shaft 9 can be inserted is formed at an appropriate position in the lower part of the beam-shaped rod having a substantially U-shaped cross section.
A hole 23.23 is bored at the lower end below the through hole 21, through which the floating support shaft 22 can be inserted horizontally. A fixing means (not shown) is provided on the upper part of the backrest rod 3 so that the backrest plate 24 can be attached thereto.

The connecting portion 4 is provided in conjunction with the lower end portion of the backrest rod 3, but in this embodiment, the connecting portion 4 is provided on both sides of the lower end portion of the backrest rod 3, which is disposed toward the front of a groove having a substantially U-shaped cross section. The connecting plate 25 is formed by extending the plate forward and has a substantially triangular shape in side view, and the long hole 1 of the tilting member 2 is provided at the front end of both connecting plates 25.
Through hole 27.27 through which the floating support shaft 26 inserted into 4 can be inserted.
It has a hole in it. Note that the elongated hole 14 provided in the tilting member 2 and the through hole 2 provided in the connecting plate 25 forming the connecting portion 4
7 can of course be reversed.

Then, the pressing means 5 presses the protrusion 1 of the tilting member 2.
A compression coil spring 28 is interposed between the lower end of the backrest rod 3 and the lower end of the backrest rod 3, and elastically urges the two to move away from each other. A rod 31 is attached to the side surface of the central part of the cylinder 30 having the hole 29.
is fixed in a substantially T-shape, and the compression coil spring 28 is wound around the rod 31, and the floating support shaft 22 inserted through the cylinder 30 is attached to the lower end of the backrest rod 3. ,
The coil spring 28 is compressed to expose the tip thereof, and the rod 31 is inserted into the through hole 17 of the tilting member 2 from behind, and the end of the coil spring 28 is brought into contact with the stop plate 16. There are some that are worn in a compressed state.

Thus, in the chair of the present invention, the frame l, 1 is fixed to both sides of the mounting body 19 connected to the upper end of the leg base 18, and the frame l, 1 is fixed to the hole 8.8 of the frame 1 and the through hole 13. The fixed support shaft 7 is inserted, the retaining ring 32 is fitted, and the retaining ring 32 is rotatably supported. With the floating support shaft 22 inserted and the retaining ring 32 fitted and pivoted in the same manner as described above, the tip of the rod 31 around which the compression coil spring 28 of the pressing means 5 is wound is connected to the tilting member. It is inserted into the through hole 17 of the locking part 15 of No. 2 and the hole 10 of the frame 1.
．． 10 and the through hole 21.21 of the backrest rod 3, the fixed support shaft 9 is inserted, the retaining ring 32 is fitted, and the through hole 27 of the connection Fi 25.25 connected to the lower end of the backrest rod 3 is inserted. .27
The floating support shaft 26 is inserted into the elongated hole 14.14 of the tilting member 2, and the stopper ring 32 is fitted.Then, the seat plate 20 is attached to the upper surface of the tilting member 2, and the upper part of the backrest rod 3 is attached. Attach the backrest plate 24 to complete the assembly. Nao-1
A stopper 33 is appropriately provided inside the frame 1 at a position where it abuts the lower end of the backrest rod 3 to prevent the backrest rod 3 whose inclination angle is initially set from inadvertently tilting forward any further. .

Then, when the seated person sits on the seat plate 20, the front part of the tilting member 2 is fixed to the fixed support shaft 7 pivoted to the compatible wall 6.6 of the frame 1.
The compression coil spring 28 of the pressing means 5 provided between the position below the fixed support shaft 7 and the lower end of the backrest lever 3 is compressed and balanced. In this case,
The rear part of the tilting member 2 rotates upward, but in the initial unloaded state, the floating support shaft 26 attached to the connecting plate 25 is set at the upper end of the elongated hole 14 of the tilting member 2, and the seat is rotated upward. Board 20
When a load is applied only to the backrest rod 3, the backrest rod 3 is prevented from moving. If a rearward stress is applied to the backrest plate 24 in this state, the backrest rod 3, which is pivotally supported at the rear end of the frame 1 by the fixed support shaft 9, will be related to the lower end of the backrest rod 3. The pressing means 5 rotates about the fixed support shaft 9 and tilts backward against the elastic force of the coil spring 28 of the pressing means 5, and the rod 31 of the pressing means 5 further protrudes from the through hole 17. When the elastic force of the coil spring 28 compressed between the cylindrical body 30 and the stop plate 16 is balanced, and a large rearward stress is applied to the backrest plate 24, the lower end of the backrest rod 3 The floating support shaft 26 attached to the connecting plate 25 that forms the connected connecting part 4 hits the upper end of the elongated hole 14 of the tilting member 2, and acts in a direction in which the front part of the tilting member 2 rotates downward, and the above-mentioned pressing force is applied. The compression coil spring 28 of the means 5 is further compressed to rest in the balanced position.

Further, in another embodiment shown in FIG. 3, the shape of the side plates 11.11 of the tilting member 2 is substantially triangular in side view with the rear part protruding downward, and a pressing means 5 is provided at the lower end of this protrusion 12. A locking portion 15 for fixing one end of the compression coil spring 28 is formed, and the compression coil spring 28 is also formed at the lower end of the backrest lever 3.
A locking portion 34 is formed to fix the other end, and a connecting rod 35 is used as the connecting portion 4, one end of which is pivotally connected to the lower end of the backrest rod 3, and the other end is tiltable in the same manner as described above. It is pivotally connected to the floating support shaft 26 which is loosely inserted into the elongated hole 14.14 formed in the side plates 11.11 of the member 2. In this case, since the connecting rod 35 freely rotates around the pivot point pivoted to the backrest rod 3, accuracy regarding the position and size of the elongated hole 14 is not required so much.

It should be noted that if the mechanical part constructed by assembling the various members shown in Fig. 2 is manufactured to various sizes and shapes in advance as a mechanical unit M, the mechanical part shown in Fig. 4 and Fig. 5 can be manufactured. as,
It becomes possible to easily assemble chairs of various types. That is, as shown in FIG.
, M (simply shown) is fixed, and as shown in FIG. A rotary chair constructed by fixing mechanical units I-M and M similar to those described above on both sides of the chair, and a mounting body connected to a leg stand 18 similar to that shown in FIG. 4 (bl) as shown in FIG. Mechanical unit M on both sides of 19.

A rotary chair or the like can be easily constructed in which M is fixed, the backrest rods 3 are bent so as to approach each other from both sides, and the backrest plate 24 is connected at the center. Here, the seat plate 20 and the backrest plate 2 are attached to the semi-finished product in the state shown in FIG.
4, for example, as shown in FIG.
By forming fittings 137 that open downwardly on both sides of the backrest plate 24 and fittings /J138 that open backwardly on both sides of the backrest plate 24, they fit into the tilting member 2 and the backrest rod 3 of the mechanism unit M, respectively. In addition, a back cover 3 is attached to the back of the backrest plate 24.
9 can be easily assembled by fixing 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 generally U-shaped cross section that opens at least upwardly and has a compatible wall; A tilting member that forms elongated holes of approximately equal distance and attaches a seat plate to the upper surface, and a backrest rod whose lower part is pivoted to the supporting wall at the rear end of the frame by a fixed support shaft and whose upper part is attached to a backrest slope. a connecting portion having one end connected to the lower end of the backrest rod and the other end pivotally connected to the elongated hole of the tilting member by a floating support shaft; and a connecting portion located below the pivot point of the tilting member. The lower end of the backrest lever is connected to the lower end of the backrest rod, and the pressing means is elastically biased by a compression coil spring in a direction in which the two are moved apart, so that the pressure can be adjusted according to the weight of the person seated on the seat plate. The sinking depth of the front part of the tilting member increases or decreases, and accordingly, the pressing means interposed between the position below the pivot point of the tilting member and the lower end position below the pivot point of the backrest rod is compressed. When the rate of compression of the coil spring increases or decreases and a backward stress is applied to the backrest plate, i.e., the backrest rod, the resistance force when the compressed coil spring is further compressed, that is, the backward tilt of the backrest rod. It is possible to increase or decrease the restoring force that acts forward when the compression coil spring is compressed, and even if a large stress is applied to the backrest plate, that is, the backrest rod, from the balanced state where the compression coil spring is compressed, the lower end of the backrest rod will not be affected. One end of the linked connecting part was pivotally attached to the long hole provided at a rear position from the pivot point of the tilting member in a loosely inserted state by a floating support shaft, so that the floating support shaft came into contact with the upper end of the long hole. After making contact, the front part of the tilting member is further rotated downward by the rear part of the backrest lever, and as a result, the compression coil spring is further compressed, so that the restoring force of the backrest lever becomes extremely strong. This prevents further backward leaning. Therefore, even if the weight of the person sitting is large (different), the seater can always sit stably in a well-balanced state. Not only does it not tilt and give a feeling of instability to the seated person, it also does not overturn later.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of the main parts showing a typical embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts, and FIG. 3 is a simplified longitudinal sectional side view of the main parts showing another embodiment. Figure 4 (al (bl)
(cl is a simplified perspective view of a semi-finished product of various chairs constructed using mechanical units, and Figure 5 is an abbreviated perspective view showing how the seat plate and backrest plate are attached to the chair in the state shown in Figure 4. 1: frame, 2: tilting member, 3: backrest rod, 4: connecting portion, 5: pressing means, 6: vertical wall, 7: fixed support shaft, 8: hole,
9: Fixed support shaft, lO: hole, 1 side plate, 12: protrusion, 1
3: Through hole, 14: Long hole, 15: Locking part, 16: Stop plate,
17; Through hole, 18: Leg stand, 19: Mounting body, 20: Seat plate,
21: Through hole, 22: Floating support shaft, 23: Hole, 24: Backrest plate, 25: Connection plate, 26: Floating support shaft, 27: Through hole, 28
: Compression coil spring, 29: Through hole, 30: Cylindrical body, 31:
Rod body, 32: Retaining ring, 33: Stopper 34: Locking portion, 35: Connecting rod, 36: Support shaft, 37; Fitting groove, 38
: Fitting groove, 39: Back cover Figure 7-1

Claims (1)

[Scope of Claims] 1) A frame having a generally U-shaped cross section and having a compatible wall that opens at least upwardly and is attached to a leg stand, and a frame having a rear portion pivoted to the compatible wall at the rear of the frame by a fixed support shaft; A long hole is formed in both side plates at a position rearward from the pivot point, and a tilting member is provided on the upper surface for attaching the seat plate, and the lower part is pivoted by a fixed pivot on the supporting wall at the rear end of the frame. a backrest rod that supports the backrest plate and attaches the backrest plate to the upper part; one end is connected to the lower end of the backrest rod, and the other end is pivotally connected to the long hole of the tilting member by a floating support shaft. and a pressing means configured to associate a position below the pivot point of the tilting member with the lower end of the backrest rod and elastically bias them with a compression coil spring in a direction in which the two move away from each other. A chair. 2) The chair according to claim 1, wherein the connecting portion is a connecting plate formed by extending and projecting the lower end of the backrest rod forward. 3) The chair according to claim 1, wherein the connecting portion is a connecting rod that is pivotally connected to the lower end of the backrest rod by a floating support shaft.