JPH0467846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present application relates to a folding chair, particularly suitable for wooden chairs and the like.

Conventional technology Conventionally, a metal pipe is bent into a square shape and a seat plate is attached to the upper surface between the middle parts of the left and right leg rods of the front leg, which is made by bending a metal pipe downward into a U-shape and attaching a backrest plate to the top. The rear part of the seat having a seat part is rotatably pivoted, and the upper ends of the left and right leg rods of the rear leg part are formed by bending a metal pipe upward in a U-shape. The left and right rear ends of the seat are foldably connected via link rods, and when assembled, the front leg and the rear leg open into an inverted V-shape, and the seat is supported horizontally. Folding chairs with this configuration 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 for use in meeting rooms, dining rooms, etc. that express a luxurious atmosphere.For example, when a seated person leans back and the front legs of the chair are raised above the ground, The seat 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 the purpose.

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 bottom 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 member having a rear end pivotally attached to a side portion of the rear leg portion, extending forward in a substantially horizontal manner, and having a front end pivotally attached to an intermediate position of the mounting plate of the seat member.
a link rod, and a second link rod having a sliding shaft at its front end that slides while being guided by the sliding hole of the mounting plate, tilting downward and forward, and having its front end pivoted to the side of the front leg. and a third link rod whose front end is pivotally connected to the sliding shaft and is inclined rearward and downward, and whose rear end is pivotally connected to the side of the rear leg, and when the chair is assembled, the seat member is The present invention provides a folding chair characterized in that it is provided with a receiving means for receiving the rear part of the seat member. It has an engagement groove that engages the link rod from above, and also has a shaft rod that connects the sliding shafts that slide while being guided by the sliding holes in the pair of left and right link mechanisms. Furthermore, in the above, an upward locking recess is provided at the rear of the sliding hole of the mounting plate, into which the sliding shaft is fitted when the chair is folded.

Function When folding the chair from the assembled state shown in Fig. 1, the rear part of the seat member is pulled up to release the receiving state and the engagement between the sliding shaft and the engagement recess, respectively. 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 the third
It is folded into a flat shape as shown in the figure.

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, the first link rod and the third link rod are rotated clockwise, and the second link rod is rotated counterclockwise, and the sliding shaft is moved into the sliding hole. The sliding shaft is fitted into the locking recess while being guided by the seat member, and the rear part of the seat member is received by the receiving means, and the front leg and the rear leg are connected to each other. It is assembled vertically as shown in FIG. In this state, even if, for example, a seated person raises the front leg of the chair that has been bent backwards from the ground, 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.
A backrest plate 3a curved slightly backward is installed between the upper ends of the left and right leg rods 2a, 2b which are elongated vertically, and a horizontal bar 3b is installed between the lower parts of the left and right leg rods 2a, 2b. The rear legs are made of wood and integrally have a backrest 3 at the top, and the upper and lower halves of the left and right leg rods 2a, 2b are slightly inclined backward. 4 is
A seat member is shown in which a cushion 7 is attached to the upper surface of a seat 6 in which a seat board 6a is laid on the upper surface of a rectangular frame 5 made of wood, and the left and right ends of the front frame rod 5a of the frame 5 are Notches 8, 8 are provided, and
Engagement grooves 9, 9 for inserting first link rods 19, 19, which will be described later, from above are provided at left and right positions on the lower surface of the rear frame rod 5b of the frame body 5.
A pair of mounting plates 1 extending in the front-rear direction are provided between the left and right positions on the inner side of the rear frame rod 5b and the left and right positions on the inner side of the rear frame rod 5b.
1 and 11 are installed in parallel, and these mounting plates 11 and 11
are arranged side by side, and the mounting plates 11, 11 are each provided with a sliding hole 12 that extends forward and backward with a slight downward inclination toward the rear, and has an upward locking recess 12a at the rear end. Reference numeral 13 denotes left and right leg rods 15 whose upper ends intervene in the notches 8, 8 of the frame body 5, and which are pivoted 14 at the positions of the notches 8, 8 so as to be vertically rotatable.
A front leg made of wood is shown in which the middle parts of the front legs 15a and 15b are connected by a horizontal crosspiece 16. In other words, the left and right leg rods 15a, 1 of the front leg portion 13
5b and the left and right leg rods 2a, 2b of the rear leg portion 1 are configured to face each other in the front and rear. 17,1
Reference numeral 7 indicates a pair of left and right link mechanisms, and the link mechanisms 17 have their rear ends rotatably pivoted 18 on the inner surfaces of the leg rods 2a and 2b of the rear leg portion 1, and their front ends extend forward. A first link rod 19 rotatably pivoted at approximately the middle position of the mounting plate 11 in the front-rear direction.
The rear end is rotatably pivoted to a sliding shaft 20 consisting of a shaft rod extending in the left-right direction and slidingly penetrating the sliding holes 12, 12 of the mounting plates 11, 11 so as to move downward and forward. A second link rod 22 is inclined and whose front end is rotatably pivoted to a pivot piece 21 disposed on the left and right rear surfaces of the horizontal crosspiece 16 of the front leg portion 13, and the front end of the sliding shaft 20 A third link rod 24 is rotatably pivoted and tilted downward, and its rear end is rotatably pivoted to a pivot piece 23 disposed at the front left and right positions of the horizontal crosspiece 3b of the rear leg portion 1. It is composed of.

In the above, it is preferable that the rear end of the second link rod 22 and the third
The front end of the link rod 24 is configured to come 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,
Engagement between link rod 19 and engagement groove 9 and sliding shaft 20
and the engagement recess 12a of the sliding hole 12 are released, respectively. Then, the seat member 4 rotates in the standing direction, the first link rod 19 and the third link rod 24 rotate counterclockwise, and the second link rod 22 rotates clockwise and slide. The shaft 20 moves in the front direction of the sliding hole 12 while receiving frictional resistance between it and the sliding hole 12, and the seat member 4 and the front leg portion 13 extend linearly, as shown in FIG. folded into a flat shape. Next, when assembling the chair from the folded state shown in FIG. 3, 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 is horizontally tilted, the first link rod 19 and the third link rod 24 are rotated clockwise, and the second link rod 22 is rotated counterclockwise, so that the sliding shaft 20 moves toward the rear of the sliding hole 12 while receiving frictional resistance between it and the sliding hole 12,
As the seat member 4 becomes horizontal, the sliding shaft 20 fits into the locking recess 12a, and as shown in FIG. The rear part of the seat member 4 is received, and the first,
The chair is assembled as shown in Figure 2. In this state, even if the seated person leans back and lifts the front legs of the chair above the ground, there is no risk that the seat member 4 will rotate upward and the chair will buckle.

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 substantially vertically,
A chair with a good appearance similar to a normal chair having a horizontal seat member on the upper part can be constructed, and since the rear lower surface of the seat member is received by the receiving means, stability in use is good, and 1st
Since the pivot portion at the front end of the link rod and the sliding shaft do not overlap laterally, the width of the rear leg portion and the width of the front leg portion can be made equal, resulting in a good appearance. In the chair, the seat member and the pair of link mechanisms can be prevented from swinging in the left and right direction in the assembled state, and further, in the folding chair according to claim 3, the pair of left and right link mechanisms are interlocked via the pivot rod. Assembling and folding the chair can be performed smoothly, and the mechanical strength of the link mechanism is increased.Furthermore, in the folding chair according to claim 4, the pivot rod fits into the locking recess of the sliding hole in the assembled state. There is no sliding of the sliding shaft in the assembled state, which has the advantage of increasing stability in the use state.

[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 a rear leg, 3 is a backrest, 4 is a seat member, 9 is a locking groove, 11 is a mounting plate, 12 is a sliding hole,
12a is a locking recess, 13 is a front leg, 17 is a link mechanism, 19 is a first link rod, 20 is a sliding shaft, 2
2 is a second link rod, and 24 is a third link rod.

Claims (1)

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