JPH0440530Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chair in which a backrest plate tilts in accordance with the backward leaning of a seated person, and a seat plate slides back and forth.

[Conventional technology]

Conventionally, a chair in which the backrest plate tilts back and forth and the seat plate slides forward from an initial state with no load is already known, but the tilting of the backrest plate and the sliding of the seat plate operate independently. It was hot. In these conventional chairs, the backrest rod, which connects the backrest plate to the upper end, is pivoted to the underside of the seat, and the backrest plate is always tilted forward in order to support the seated person's backward leaning. The rod is elastically biased by a coil spring, and the strength of the spring is adjusted depending on the seated person, but if the weight difference between the seated persons is large,
Since the tilting angle of the backrest plate varies greatly, it is necessary to adjust the strength of the spring each time, which poses a problem when used by an unspecified number of people. In addition, chairs with elastic bodies that elastically support the backrest plate buried inside the backrest rod or seat part are adjusted to standard specifications at the time of shipment from the factory, and it is impossible for the seater to adjust them from the outside. It still had the problems mentioned above. Therefore, the chair has a backrest plate whose resistance to tilting backwards changes depending on the weight of the seated person, that is, the resistance force against tilting backwards is large for a heavy seated seater, and the resistance against backward tilting is large for a seated seated person who is light in weight. It was hoped that a chair would be made smaller.

[The problem that the idea attempts to solve]

The present invention aims to solve the above-mentioned situation by automatically changing the resistance force against the backward tilting of the backrest plate according to the weight of the seated person, so that the seated person can always sit stably. To provide a chair in which the tilting of a backrest plate and the back and forth sliding movement of a seat plate are effectively linked to each other.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is a long box with an upward opening that can be attached to a footrest, and a guide surface that is inclined diagonally upward and forward at the front end, and a fixed support at the rear of the compatible wall. A frame into which a shaft is inserted and whose rear end extends upward to form a support part, and a frame having a shape that can be accommodated in the frame, and a front end that slides into contact with a guide surface of the frame. At the same time, a long hole is formed at the rear of each side plate for loosely inserting the fixed support shaft of the frame and sliding it back and forth, and a movable member for attaching a seat plate to the upper surface, and a support part for the front end frame. a backrest rod that is pivoted by a fixed support shaft with a lower end left over the upper end and to which a backrest plate is attached to the upper part; a locking portion provided at an appropriate position on the movable member; and a locking portion provided at the lower end of the backrest rod. The chair is made of a compression coil spring whose both ends are connected to a locking part.

Further, a guide support shaft is inserted into the front end of the compatible wall of the frame instead of the guide surface formed on the frame, and a guide shaft is inserted into the front end of both side plates of the moving member instead of the sliding part of the moving member. It is constructed by forming a long slide hole inclined diagonally upward and forward in which the guide support shaft can be inserted and slid loosely.

[Effect]

In the chair of the present invention constructed as described above, when a seated person sits on the seat plate, the front part of the seat plate moves diagonally downward and rearward as the sliding part of the moving member slides along the guide surface of the frame. At the same time, the rear part of the seat plate is guided by the elongated hole of the movable member that is loosely inserted into the fixed support shaft of the frame, and moves rearward. The compression coil spring inserted between the two locking parts compresses and increases the repulsive force, and stops at a position where the repulsive force and the sliding force due to the body weight are balanced, and in that state, the backrest plate, that is, the backrest rod When a rearward stress is applied, the upper part of the backrest lever tilts backward around a fixed support shaft pivoted to the support part of the frame, and the lower end moves forward to further compress the compression coil spring. It is. 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 plate changes depending on the magnitude of the weight.

Further, even when a guide support shaft is provided in the frame and an oblique sliding slot is formed in the moving member, the same effect can be obtained.

〔Example〕

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

FIG. 1 shows a typical embodiment of the chair of the present invention,
In the figure, 1 is a frame, 2 is a moving member, 3 is a backrest lever, and 4 is a compression coil spring.

The frame 1 consists of an elongated box body with an upward opening and a generally U-shaped cross section and has compatible walls 5, 5, and a front end of a bottom plate 6 is extended diagonally upward and forward to form a guide surface 7, and the compatible walls A fixed support shaft 8 is horizontally inserted into the rear portions of the supporting walls 5, 5, and the rear ends of the compatible walls 5, 5 and the bottom plate 6 are extended and protruded obliquely upward to form a support portion 9.
is formed. Although the guide surface 7 is formed by extending the bottom plate 6, it is of course possible to form the guide surface 7 by bending both side plates 10, 10 inwardly facing each other.

The moving member 2 has a generally U-shaped cross section and is sized to be housed in the frame 1 as a whole. A slide portion 11 that can slide in contact with the surface 7 is formed, and both side plates 10,
A long hole 12 is formed at the rear of the frame 10, into which the fixed support shaft 8 of the frame 1 is loosely inserted and guided to slide back and forth. Although the slide portion 11 is tilted as a whole, it is also possible to make only the portion that contacts the guide surface 7 protrude so that the slide portion 11 makes point contact so that sliding can be performed even more smoothly.

The backrest rod 3 is attached to the frame 1 with the lower end remaining.
It is pivotally supported by a fixed support shaft 13 inserted horizontally into the upper ends of both side plates 10, 10 of the support part 9, and the lower end is bent forward.

Then, a locking portion 14 is formed at a suitable location between the side plates 10, 10 of the moving member 2, and a similar locking portion 15 is formed at the lower end of the backrest lever 3,
Both ends of a compression coil spring 4 are connected to the locking portions 14 and 15, respectively, to elastically urge the moving member 2 forward and the lower end of the backrest lever 3 backward.

Further, the frame 1 is fixed in parallel to both sides of a mounting body 17 rotatably connected to the upper end of the leg stand 16, a seat plate 18 is attached to the upper surface of the moving member 2, and There is a backrest plate 1 on the top.
9 to construct a rotating chair as shown in FIG.

Thus, in the chair of the present invention, one end of the compression coil spring 4 is connected to the locking portion 14 of the movable member 2, and the compression coil spring 4 is installed inside the frame 1 from above, and one side plate 10 of the frame 1 is installed from above. The fixed support shaft 8 inserted through the movable member 2 is loosely inserted into the long hole 12 of the movable member 2 and passed through the other side plate 10, and a retaining ring (not shown) is fitted and inserted. An end of the compression coil spring 4 is connected to the locking part 15, and a support shaft 13 is fixed to the upper end of both side plates 10, 10 located on the support part 9 of the frame 1 while the compression coil spring 4 is in a compressed state. Assemble it by pivoting it so that it can rotate. Here, the rear of the frame 1 which abuts at a position below the fixed support shaft 13 of the backrest rod 3 is prevented from being tilted forward beyond the initial inclination angle due to the elastic bias of the compression coil spring 4. Although a stopper 20 is appropriately provided at the end, it is also possible to use a portion obtained by extending the rear end of the bottom plate 6 upward.

In this way, when a seated person sits on the seat plate 18, the front part of the movable member 2 sinks diagonally downward and rearward as the sliding part 11 of the movable member 2 slides into contact with the guide surface 7 of the frame 1. The rear part is guided by the fixed support shaft 8 inserted into the frame 1 and the elongated hole 12 of the movable member 2 and moves rearward, and accordingly, the locking portion 14 of the movable member 2 and the lower end of the backrest rod 3 The coil spring 4 interposed between the locking portions 15 is compressed to increase the resistance force of the coil spring 4 against the backward tilting of the backrest lever 3. here,
The resistance force, or restoring force, increases with the weight of the seat plate 1.
8 sinks deeper and compresses the coil spring 4 more, so it becomes larger. When sitting down and leaning on the backrest rod 3, the front part of the seat plate 18 sinks and moves rearward, and the backrest rod 3 is tilted backwards in a balanced state. When stress is applied to the seat plate 18, the repulsive force of the compression coil spring 4 overcomes the weight acting on the seat plate 18, and the seat plate 18 slides forward, and the front portion rises diagonally upward.

The other embodiment shown in FIG. 2 is basically the same as the embodiment described above, but differs only in the structure for guiding the front part of the seat plate 18 diagonally downward. That is, the guide shaft 21 is horizontally inserted into the front ends of the compatible walls 5, 5 of the frame 1, and the guide shaft 21 is loosely inserted into the front ends of the side plates 10, 10 of the moving member 2. A slide slot 22 is formed that is movable and tilts diagonally upward and forward, and its operation is exactly the same as that described above.

Incidentally, the relationships between the fixed support shaft 8 and the elongated hole 12 and between the guide support shaft 21 and the slide elongate hole 22 can also be reversed.

In addition, if the mechanical unit assembled with the frame 1, moving member 2, backrest rod 3, and compression coil spring 4 of the present invention is designed in various sizes and shapes, and various mechanical units are manufactured in advance, a wide variety of mechanical units can be manufactured. It is possible to easily realize a chair with a certain aspect. For example, as mentioned above, a rotating chair can be configured as shown in FIG.
The pipe chair can be configured as shown in the figure, which is convenient for practical use.

[Effect of idea]

According to the above-described chair of the present invention, it has a long box body with an upward opening that can be attached to a leg stand, and a guide surface that is inclined diagonally upward and forward at the front end, and a fixed support at the rear of the compatible wall. A frame into which a shaft is inserted and whose rear end extends upward to form a support part, and a frame having a shape that can be accommodated in the frame, and a front end that slides into contact with a guide surface of the frame. At the same time, a long hole is formed in the rear part of both side plates for loosely inserting the fixed support shaft of the frame and sliding it back and forth, and a movable member for attaching a seat plate to the upper surface, and a support part for the frame. a backrest rod that is pivoted by a fixed support shaft with a lower end left over the upper end and to which a backrest plate is attached to the upper part; a locking portion provided at an appropriate position on the movable member; and a locking portion provided at the lower end of the backrest rod. It consists of a compression coil spring whose both ends are connected to a locking part, so depending on the weight of the person sitting on the seat plate, the front part of the moving member can be connected to a guide surface and a slide part or a guide support shaft and a slide elongated hole. The rear part is guided by the fixed support shaft and the elongated hole and moves backward to compress the compression coil spring, thereby increasing or decreasing the resistance force against the backward tilting of the backrest rod. Therefore, even if the weight of the seated person varies greatly, the seater can always sit stably in a well-balanced state.
Not only does the backrest plate not tilt extremely backward unexpectedly and give a sense of instability to the seated person, unlike in the case of a heavy person sitting on the seat, it also does not turn around afterward.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of the main parts showing a typical embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the main parts showing another embodiment, and Fig. 3 is a perspective view of a rotating chair constructed according to the invention. 4 are perspective views of a pipe chair constructed according to the present invention. DESCRIPTION OF SYMBOLS 1... Frame, 2... Moving member, 3... Backrest rod, 4... Compression coil spring, 5... Standing wall, 6...
...Bottom plate, 7...Guide surface, 8...Fixed support shaft, 9...
Support part, 10... Side plate, 11... Slide part, 1
2... Long hole, 13... Fixed support shaft, 14... Locking part, 15... Locking part, 16... Leg stand, 17... Mounting body, 18... Seat plate, 19... Backrest Board, 20...
...Stopper, 21...Guide support shaft, 22...Slide slot.

Claims (1)

[Claims for Utility Model Registration] 1. An elongated box with an upward opening that can be attached to a leg stand, with a guide surface inclined diagonally upward and forward at the front end, and a fixed support shaft inserted into the rear of the dual-supporting wall. a frame having a rear end extending upwardly to form a support portion; and a slide portion having a shape that can be accommodated in the frame and capable of sliding in contact with a guide surface of the frame at a front end. At the same time, a long hole is formed at the rear of each side plate for loosely inserting the fixed support shaft of the frame and sliding it back and forth, and a movable member for attaching a seat plate to the upper surface; a backrest lever that is pivoted on a fixed support shaft with its lower end left open, and a backrest plate is attached to the upper part; a locking portion provided at an appropriate position on the movable member; and a locking portion provided at the lower end of the backrest rod. A chair characterized by comprising a compression coil spring having both ends connected to the section. 2. It is a long box with an upward opening that can be attached to a leg stand, and a guide support shaft is inserted into the front end of the compatible wall, a fixed support shaft is inserted into the rear of the compatible wall, and the rear end is opened upward. a frame formed by extending and protruding to form a support part; and a frame having a shape that can be accommodated in the frame and tilting diagonally upward and forward so that a guide shaft of the frame can be loosely inserted and slid on the front end of both side plates. a sliding elongated hole is formed in the rear part of each side plate, and an elongated hole is formed in the rear part of each side plate for loosely inserting the fixed support shaft of the frame and sliding it back and forth; a movable member for attaching a seat plate to the upper surface; a backrest rod which is pivotally supported by a fixed support shaft with a lower end left at the upper end of the part, and a backrest plate is attached to the upper part; A chair comprising: a compression coil spring having both ends connected to a locking portion provided therein;