JPH01218409A - Folding chair - Google Patents

Abstract

PURPOSE:To execute a constitution to an ordinary chair, and simultaneously, to obtain a stability by composing the chair of a first link lever to be pivotally fitted in the midpoint of the fitting plate of a seat member, a second link lever whose front edge is pivotally fitted to the side of a front leg part, and a third link lever whose rear edge is pivotally fitted to the side of a rear leg part, and providing a supporting means to support the rear of the seat member. CONSTITUTION:When a seat member 4 is turned in a standing direction, the first link lever 19 and a third link lever 24 are turned in a counterclockwise direction, and the second link lever 22 is turned in a clockwise direction, respectively. Simultaneously, a sliding shaft 20 is slid by being guided by means of a sliding hole 12, the seat member 4 and a front leg part 13 are stretched in a straight line condition, and they are folded in a flattened condition. The rear edge of the seat member 4 is pressed downward and turned in the counterclockwise direction. Then, the seat member 4 is made to fall in a horizontal direction, simultaneously, the first link lever 19 and third link lever 24 are turned in the clockwise direction, the second link lever 22 is turned in the counterclockwise direction, respectively, the sliding shaft 20 is guided by the sliding hole 12, simultaneously, the shaft 20 is slid to the rear side of the seat member 4, the sliding shaft 20 is fitted in an engaging recessed part 12a, simultaneously, the rear of the seat member 4 is supported by the supporting member, and simultaneously, the front leg part 13 and a rear leg part 1 is assembled in standing in a vertical condition.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present application relates to a folding chair, which is particularly suitable as a wooden chair or the like.

Conventional technology Conventionally, a metal pipe is bent downward into a U-shape and a backrest plate is attached to the upper part of the front leg, between the middle parts of the left and right leg rods.
The upper ends of the left and right leg rods of the rear legs are made by bending a metal pipe into a rectangular shape and having a seat plate on the top surface, and rotatably pivoting the rear part of the seat part, and by bending the metal pipe upward into a U-shape. In the department,
The left and right leg rods of the front leg portion and the left and right rear end portions of the seat portion are foldably connected via link rods, and the front leg portion and the rear leg portion open in an inverted V shape when assembled. Folding chairs in which the seat portion is supported horizontally are generally widely used.

Problems to be Solved by the Invention However, since the folding chair constructed as described above is made of metal pipes, the appearance not only gives the impression of being an auxiliary chair, but also has a wooden tone. It is unsuitable as a chair for use in conference rooms, dining rooms, etc. that expresses a luxurious atmosphere. part rotates upward,
There were inconveniences such as a lack of safety such as seated passengers falling backwards.

Therefore, an object of the present application is to provide a folding chair that can be easily constructed from wood, can be constructed into a normal chair with front legs and rear legs standing up almost vertically, and can provide stability. This is what I did.

Means for Solving the Problems In order to solve the above-mentioned problems, the present application provides a mounting system having a rear leg portion integrally having a backrest portion above and a sliding hole extending in the front and back direction on the left and right positions of the lower surface of the seat. It consists of a rectangular seat member on which a plate is arranged, a front leg section vertically rotatably attached to the front lower part of the seat member, and a pair of left and right link mechanisms that foldably connect these members. a first link rod whose rear end is pivotally connected to the side of the rear leg portion, extends forward substantially horizontally, and whose front end is pivotally connected to an intermediate position of the mounting plate of the seat member; a second link rod having a sliding shaft that slides guided by the sliding hole, tilting downward and forward, and having its front end pivoted to the side of the front leg; and the front end pivoted to the sliding shaft. and a third link rod that is inclined rearward and downward, and whose rear end is pivotally connected to the side of the rear leg, and
This invention provides a folding chair characterized in that it is provided with a receiving means for receiving the rear part of the seat member when the chair is assembled. The first link rod of the link mechanism is provided with an engagement groove that engages the first link rod from above, and the sliding shaft that slides while being guided by the sliding holes in the pair of left and right link mechanisms is provided as an axis. They are connected by a rod, and furthermore, an upward locking recess into which the sliding shaft is fitted when the chair is folded is provided at the rear of the sliding hole of the mounting plate.

Function: When folding the chair from the assembled state shown in FIG. When the member is rotated in the upright direction, the first link rod and the third link rod are rotated counterclockwise and the second link rod is rotated clockwise, and the sliding shaft is rotated in the sliding hole. The seat member and the front leg extend in a straight line and are folded into a flat shape as shown in FIG.

Next, when assembling the chair from the folded state shown in FIG. 3, the rear end of the seat member is pressed downward and rotated counterclockwise so that the seat member and front legs are bent. Then, the seat member is laid down horizontally, and the first link rod and the third link rod are
The link rod rotates clockwise and the second link rod rotates counterclockwise, and the sliding shaft slides behind the seat member while being guided by the sliding hole, and the sliding shaft is locked. While fitting into the recess, the rear part of the seat member is received by the receiving means, and the front leg and the rear leg are erected vertically and assembled as shown in FIG. In addition, in this state, for example, if the seated person leans back and lifts the front legs of the chair above the ground surface.
Even in such a case, there is no risk that the seat member will rotate relative to the rear leg due to the receiving means.

Embodiments Below, the embodiments of the present application will be described in detail with reference to the drawings.(1) is a backrest that is slightly curved backwards between the upper ends of the vertically long left and right leg rods (2)a and (2)b. A piece of wood on which a board (3)a is erected, a horizontal beam (3)b is erected between the lower parts of the left and right leg rods (2)a and (2)b, and the backrest part (3) is integrated into the upper part. The left and right leg rods (2) a,
(2) The upper and lower halves of b are slightly inclined backward. (4) shows a seat member in which a cushion (7) is attached to the upper surface of a seat base (6) in which a seat plate (6) a is laid on the upper surface of a rectangular frame body (5) made of wood; There are notches (8) at the left and right ends of the front frame rod (5) a of the body (5).
is provided, and the rear frame rod (5) of the frame body (5)
At the left and right positions on the bottom surface of b are the first link rods (19), which will be described later.
(19) from above, the engagement groove (9), (9
), and furthermore, a pair of mounting plates (11) extending in the front-rear direction are provided between the left and right positions on the inside surface of the front frame rod (5)a and the left and right positions on the inside surface of the rear frame rod (5)b. , (11) are arranged side by side, and these mounting plates (11), (11) are arranged side by side, and on these mounting plates (11), (11), there is a mounting plate (11), (11) that extends back and forth with a slight downward inclination. , and a sliding hole (12) having an upward locking recess (12) a at the rear end. (13) has an upper end that intervenes in the notch (8) of the frame (5), and the notch (8).
, (8) shows the front leg made of wood, with the intermediate parts of the left and right leg rods (15) a and (15) b, supported vertically rotatably (14), connected by a horizontal crosspiece (16). ,
The left and right leg rods (15) a, (
15) The distance b is between the left and right leg rods (2) of the rear leg (1).
) a, (2) so that the interval is approximately equal to b, i.e.,
Left and right leg rods (15)a of the front leg (13), (15)
b and left and right leg rods (2)a, (2)b of the rear leg (1) are configured to face each other in the front and rear. (17
), (17) indicate a pair of left and right link mechanisms, and the link mechanism tl (17) is connected to the leg rod (2) of the rear leg (1).
a, (2) The rear end is rotatably pivoted to the inner surface of b (1B) and extends forward, and the front end thereof is attached to the mounting plate (11).
Rotatably pivots at approximately the middle position in the front-rear direction (10)
The first link rod (19), the mounting plate (11), (
11) A sliding shaft (2) consisting of a shaft rod extending in the left-right direction and slidingly penetrating the sliding hole (12) of (11), (12).
0) with the rear end rotatably pivoted and tilted downward and forward,
A second link rod (22) whose front end is rotatably pivoted to a frame stopper (21) disposed on the left and right rear surfaces of the horizontal crosspiece (16) of the front leg (13); A carrying piece (23) whose front end is rotatably pivoted to the shaft (20) and tilted downward, and whose rear end is arranged at the front left and right positions of the horizontal crosspiece (3) b of the rear leg (1). ) The third link rod (
24).

In the above, it is preferable that the rear end of the second link rod (22) and the third link rod ( 24) is configured so that the front end portion of the mounting plate (11) comes into pressure contact with the side surface of the mounting plate (11) without play.

Therefore, when folding the chair from the assembled state shown in FIGS. 1 and 2, by pulling up the rear part of the seat member (4), the receiving means, that is, the first link rod (19)
and the engagement groove (9), and the sliding shaft (20) and the sliding hole (
12) are disengaged from the engagement recesses (12)a, respectively.

Then, the seat member (4) rotates in the standing direction, the first link rod (19) and the third link rod (24) move counterclockwise, and the second link rod (22) moves clockwise. The sliding shaft (20) moves in the front direction of the sliding hole (12) without receiving any frictional resistance between it and the seat member (4). The legs (13) extend linearly and are folded into a flat shape as shown in FIG. Then the third
When assembling the chair from the folded state shown in the figure, the rear part of the seat member (4) is pushed down so that the seat member (4) and the front legs (13) are bent at right angles. Then, the seat member (4
) lies down horizontally, and the first link rod (19) and the third link rod (24) move clockwise to the second link rod (
22) are rotated counterclockwise, and the sliding shaft (20) is
The sliding hole (12) does not receive any frictional resistance between it and the sliding hole (12).
12) Moves backward, and the seat member (4) becomes horizontal, and the sliding shaft (20) fits into the locking recess (12) a, and the seat member (4) becomes in the receiving position as shown in FIG. The means, that is, the first link rod (19) and the engagement groove (9) engage with each other, so that the rear part of the seat member (4) is received. The chair is assembled as shown in Figure 2. In this state, for example, if the seated person leans back and lifts the front legs of the chair above the ground, the seat member (
4) There is no risk of the chair buckling due to upward rotation.

Effects of the Invention Since the present application is configured as described above, it produces the following effects.

That is, in the folding chair according to claim 1, a wooden sectional chair can be provided, and the front legs and the rear legs having a backrest stand up almost vertically, and the seat member is placed horizontally on top of the front legs. It is possible to construct a chair with a good appearance similar to that of a normal chair, and since the rear lower surface of the seat member is received by the receiving means, the stability in use is good, and the front end of the first link rod is pivoted. Since the folding chair and the sliding shaft do not overlap laterally, the width of the rear leg and the width of the front leg can be made equal, resulting in a good appearance. In the folding chair according to claim 3, since the pair of left and right link mechanisms are interlocked via the shaft rod, assembly and folding operations of the chair are easy. This can be done smoothly and the mechanical strength of the link mechanism is increased.Furthermore, in the folding chair according to claim 4, the shaft rod fits into the locking recess of the sliding hole in the assembled state. It has the advantage of eliminating sliding and increasing stability in use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view showing the assembled state, FIG. 2 is a partially cutaway front view showing the assembled state, and FIG. 3 is a longitudinal sectional view of the folded state. In the figure, (1) is the rear leg, (3) is the backrest, (4) is the seat member, (9) is the locking groove, (11) is the mounting plate, (12) is
is the sliding hole, (12) a is the locking recess, (13) is the front leg, (17) is the link mechanism, (19) is the first link rod, (
20) is a sliding shaft, (22) is a second link rod, and (24) is a third link rod. Figure 2a

Claims (4)

[Claims] (1) A rectangular seat member having a rear leg portion integrally having a backrest portion above, a mounting plate having sliding holes extending in the front and back direction on the left and right positions of the bottom surface of the seat base, and the front lower part thereof. The front legs are vertically rotatably attached to the front legs, and a pair of left and right link mechanisms foldably connect these. a first link rod that extends substantially horizontally forward and has a front end pivoted to an intermediate position of the mounting plate of the seat member; and a sliding shaft that slides while being guided in a sliding hole of the mounting plate at the front end; a second link rod that is tilted downward and forward and whose front end is pivotally connected to the side of the front leg, and whose front end is pivoted to the sliding shaft and is tilted backward and downward;
A folding chair comprising a third link rod whose rear end is pivotally connected to the side of the rear leg, and comprising receiving means for receiving the rear part of the seat member when the chair is assembled. (2) The folding chair according to claim 1, wherein the receiving means is provided on the rear lower surface of the seat member, and has an engagement groove at a side end portion for engaging the first link rod of the link mechanism from above. (3) The folding chair according to claim 1 or 2, wherein sliding shafts that slide while being guided by sliding holes in a pair of left and right link mechanisms are connected by a shaft rod. (4) The folding chair according to claim 1, 2 or 3, further comprising an upwardly directed locking recess into which the sliding shaft is fitted when the chair is folded, at a rear position of the sliding hole of the mounting plate.