JPH0534963B2 - - 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 downward 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, and a metal pipe is bent into a square shape and a seat plate is attached to the top surface. 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 end portions of the seat portion are foldably connected via link rods, and when assembled, the front leg portion and the rear leg portion open in an inverted V shape, and the seat portion is oriented 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 carving. It is unsuitable as a chair for use in conference rooms or dining rooms that express a luxurious atmosphere, and for example, when a seated person leans back and the front legs of the chair are raised above the ground. There were inconveniences such as the seat pivoting upward and causing the seated person to fall backwards, resulting in a lack of safety.

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 safety. This is the purpose.

Means for Solving the Problems In order to solve the above-mentioned problems, the present application includes a rear leg portion integrally having a backrest portion above, a rectangular seat member, and a vertically rotatable portion at the front lower part thereof. The attached front legs, a pair of left and right link mechanisms that connect them in a foldable manner, a toggle mechanism interposed between the rear legs and the front legs, and a and a receiving means for receiving the rear part of the link mechanism, the rear end of the link mechanism being pivotally connected to the side of the rear leg, and the front end of the link mechanism being pivotally connected to an intermediate position on the lower side of the seat member. a first link rod, a second link rod whose rear end is pivoted at a position close to the front end of the first link rod, tilts downward and forward, and whose front end is pivoted to the side of the front leg; and a third link rod whose front end is pivoted toward the rear end of the link rod and is tilted rearward downward, and whose rear end is pivotally connected to the side of the rear leg, and the toggle mechanism is connected to the rear end of the link rod. a first toggle link rod having an end rotatably connected to the rear leg; a second toggle link rod pivotally connected to the front end thereof, and a second toggle link rod having a front end rotatably connected to the front leg; , when assembling the chair, the pivoting portion between the first and second toggle link rods is slightly lower than the connection between the rear end pivoting portion of the first toggle link rod and the front end pivoting portion of the second toggle link rod. Composed of a pressing piece and a pressing piece when pressing the toggle link rod into position,
A second link between the front and rear pivot points of the first toggle link rod.
The sum of the distances between the front and rear pivot points of the toggle link rod is greater than the distance between the rear end pivot point of the first toggle link rod and the front end pivot point of the second toggle link rod when the chair is assembled. The present invention provides a folding chair characterized in that the seat member is slightly elongated, and the receiving means engages the first link rod of the link mechanism from above with the side end portion provided on the rear lower surface of the seat member. In the above, the rear end pivot portions of the second link rods in the pair of left and right link mechanisms are connected by a shaft rod, and in the above, the pressing piece also serves as the shaft rod. Furthermore, in the above, the rear end of the first toggle link rod is pivotally connected to the rear end pivot portion of the first link rod, and
The tip of the second toggle link rod is pivotally attached to the attachment portion between the seat member and the front leg.

Function When assembling the chair from the folded state shown in Figure 3, if the rear part of the seat member is pushed up so that the seat member and the front legs are bent at right angles, the seat member will fall horizontally. At the same time, the first link rod, the third link rod, and the first toggle link rod rotate clockwise, and the second link rod and the second toggle link rod rotate counterclockwise, and the seat member rotates. When in the horizontal state, the receiving means, that is, the first link rod and the engagement groove engage, and the rear part of the seat member is received by the link mechanism, and in this process, the toggle mechanism is pushed downward by the pressing piece. When pressed, the first toggle link rod and the second toggle link rod are aligned, and at this time, the strongest force is formed between the rear end pivot point of the first toggle link rod and the front end pivot point of the second toggle link rod. A tensile force is applied, and then the pivoting portions of the first toggle link rod and the second toggle link rod move along a straight line connecting the rear end pivoting portion of the first toggle link rod and the front end pivoting portion of the second toggle link rod. The chair stops at a position slightly beyond that position, and the tension of the toggle mechanism eliminates the looseness of each pivot joint, and the chair is assembled into the state shown in FIGS. 1 and 2. In this state, for example, even if the seated person leans back and lifts the front leg of the chair above the ground, there is no risk that the seat member will rotate upward and the chair will buckle.

Next, when folding the chair from the assembled state shown in FIGS. 1 and 2, for example, the pivot portions of the first and second toggle link rods are pushed upward, and the rear part of the seat member is also pulled upward. Then, the seat member rotates in the upright direction, and the third link rod, third link rod, and first toggle link rod rotate counterclockwise, respectively.
The second link rod and the second toggle link rod each rotate clockwise, and the seat member and the front leg extend linearly and are folded into a flat shape as shown in FIG.

Embodiments Hereinafter, the embodiments of the present application will be described in detail with reference to the drawings.
A backrest portion 3a slightly curved backward is installed between the upper ends of the vertically long left and right leg rods 2a and 2b, and
The rear leg section is made of wood and has a horizontal bar 3b installed and connected between the lower parts of the left and right leg rods 2a, 2b, and has a backrest 3 integrally at the upper part.The upper and lower parts of the left and right leg rods 2a, 2b are slightly tilted backwards. Reference numeral 4 indicates a seat member 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 in the rear frame rod 5b of the frame body 5, and locking grooves 9, in which the first link rods 18, 18 are inserted from above, are provided at left and right positions on the lower surface of the rear frame rod 5b of the frame body 5.
Furthermore, a pair of mounting rods 11 extending in the front-rear direction are provided on the left and right positions on the inner surface of the front frame rod 5a and on the holding pieces 10, 10 provided on the rear left and right positions of the frame body 5 opposing thereto. , 11 are arranged in parallel. 12
The upper end portions of the left and right leg rods 13a, 13b are interposed in the notches 8, 8 of the frame body 5, and are pivoted 17 at the positions of the notches 8, 8 so as to be vertically rotatable. The front leg portion made of wood is shown fixed by the crosspiece 14, and the left and right leg rods 13a of this front leg portion 12,
The inner distance between the rear leg portions 13b is approximately equal to the outer distance between the left and right leg rods 2a, 2b of the rear leg portion 1. Reference numerals 15 and 15 indicate a pair of left and right link mechanisms, and the link mechanisms 15 have their rear ends rotatably pivoted to pivots 16 provided on the inner surfaces of the leg rods 2a and 2b of the rear leg portion 1, and , a first link rod 18 whose front end is rotatably pivoted 16' at approximately an intermediate position in the longitudinal direction of the mounting rod 11, and a first link rod 1;
The rear end is rotatably pivoted 19 near the front end of the leg 8 and tilts downward and forward, and the front end is connected to the front leg 12.
Pivot pieces 20 arranged at the rear left and right positions of the horizontal crosspiece 14
A second link rod 21 is rotatably attached to the rear end of the second link rod 21, and the front end is rotatably pivoted 22' to the inner surface near the rear end of the second link rod 21, and the rear end is tilted downward. It is constituted by a third link rod 23 rotatably connected to a pivot piece 22 disposed on the front left and right positions of the horizontal beam 3b of the rear leg portion 1. Reference numeral 24 denotes a pair of left and right toggle mechanisms that are interposed between the rear leg portion 1 and the front leg portion 12 to prevent rattling when the chair is assembled. A first toggle link rod 25 is rotatably connected to the pivot 16 of the first link rod 18, and its rear end is pivotally connected 27 to its front end, and the front end preferably connects the seat member 4 and the front leg 12. Pivot part 17
The second toggle link rod 2 is rotatably connected to the second toggle link rod 2.
6. A portion connecting the pivoting portion 27 of the first toggle link rod 25 and the second toggle link rod 26 with the rear end pivoting portion 16 of the first toggle link rod 25 and the front end pivoting portion 17 of the second toggle link rod 26. a pressing piece 28 that preferably pushes up the pivot portion 27 of the first toggle link rod 25 so as to be located slightly below the line n;
and the distance between the front pivot point of the second toggle link rod 26 is the distance between the rear end pivot point 16 of the first toggle link rod 25 and the second toggle link rod in the assembled state of the chair. 26 and the front end pivot point 17. Reference numeral 29 denotes a push-up piece for releasing the toggle mechanism provided at the lower edge of the second toggle link rod 26.

When assembling the chair from the folded state shown in FIG. While lying down, the first
When the link rod 18, the third link rod 23, and the first toggle link rod 25 rotate clockwise, and the second link rod 21 and the second toggle link rod 26 rotate counterclockwise, the seat When the member 4 is in a horizontal state, the engagement groove 9 engages with the receiving means, that is, the first link rod 18, and the rear part of the seat member 4 is connected to the link mechanism 1.
5, 15, and in this process, the first toggle link rod 25 of the toggle mechanism 24 and the second
The pivot portion 27 of the toggle link rod 26 is pressed by the pressing piece 28, and the first toggle link rod 25 and the second toggle link rod 26 are aligned, and at this time, the most space between the pivot shaft 16 and the pivot point 17 is A strong tensile force is applied, and then the pivot joint 27 stops at a position slightly beyond the position of the straight line n, and the looseness of each pivot joint is eliminated by the thrust tension of the toggle mechanism 24, and the position shown in FIGS. In condition, the chair is assembled. In this state, even if, for example, the seated person leans back and places 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. Next, when folding the chair from the assembled state shown in FIG. 1 and FIG.
6 is moved to a position above the n line, and the rear part of the seat member 4 is pulled upward. Then, the seat member 4 rotates in the upright direction, and this rotation causes the first link rod 18, the third rod 23, and the first toggle link rod 25 to rotate counterclockwise, respectively, and the second
The link rod 21 and the second toggle link rod 26 rotate clockwise, and the seat member 4 and the front leg portion 1
2 extend linearly and are folded into a flat shape as shown in FIG.

In the above embodiment, the rear end of the first toggle link rod 25 is rotatably connected to the pivot shaft 16 between the rear leg portion 1 and the first link rod 18, and
Although the case is shown in which the front end of the second toggle link rod 26 is rotatably pivoted to the pivot part 17 between the seat member 4 and the front leg part 12, and the toggle mechanism is arranged at the left and right positions,
Instead of this configuration, the rear end of the first toggle link rod 25 is placed at the center of the rear leg 1 in the width direction, and the front end of the second toggle link rod 26 is placed at the center of the front leg 12 in the width direction. Of course, one toggle mechanism may be rotatably mounted and disposed at the center.

Note that FIGS. 6 to 8 show other embodiments of the present application, and the difference from the first embodiment is that the pivot joints at the rear ends of the second link rods 21 are connected to each other by an axis rod 30. , in the assembled state of the chair in which the seat member 4 is in a horizontal position, the first toggle link rod 2 is directly connected by the shaft rod 30.
Press down on the upper edge of 5 to remove the first toggle link rod 2.
5 and the second toggle link rod 26 are configured to be moved below the n-line.

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

That is, in the folding chair according to claims 1 and 5, it is possible to provide a wooden sectional chair, and the sectional chair has a front leg portion and a rear leg portion having a backrest that stand up substantially vertically, and the upper portion of the folding chair. A chair with a good appearance similar to a normal chair with a horizontal seat member can be constructed, and the rear lower surface of the seat member is received by the receiving plate, and the toggle mechanism is connected to the front leg and rear leg. Since it is interposed between the legs, it is possible to absorb the looseness of all the pivot joints existing between the two legs, and the stability of the chair in the assembled state can be obtained.Moreover, in the assembled state,
Since the toggle link rod is pressed downward by the pressing piece, even if an external force is applied to the toggle link rod unnecessarily while in use, there is no risk that the toggle action will be released and the chair will buckle, making it safe. Yes, and in the folding chair according to claim 2,
In the chair according to claims 3 and 4, the pair of left and right link mechanisms are interlocked by the shaft rod, making assembly and folding operations of the chair smooth. This has the advantage of increasing the strength of the target.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal cross-sectional view showing an assembled state, FIG. 2 is a partially cutaway front view showing an assembled state, FIG. 3 is a longitudinal cross-sectional view of a folded state, and FIG. The figures are an enlarged view of the main parts in Fig. 1, Fig. 5 is an enlarged rear view of the main parts in an assembled state with some parts omitted, and Fig. 6 is a longitudinal sectional view of another embodiment corresponding to Fig. 1. 7 is a front view of another embodiment corresponding to FIG. 2, and FIG. 8 is a longitudinal sectional view of another embodiment corresponding to FIG. 3. In the figure, 1 is a rear leg, 3 is a backrest, 4 is a seat member, 6b is a pressing piece, 9 is a locking groove, 12 is a front leg, 15 is a link mechanism, 18 is a first link rod, 1
9 is a pivot portion, 21 is a second link rod, 23 is a third link rod, 24 is a toggle mechanism, 25 is a first toggle link rod, 26 is a toggle link rod, 27 is a pivot portion, and 28 is a pressing piece. , 29 is a pressing plate, and 30 is a shaft rod.

Claims (1)

[Scope of Claims] 1. A rear leg portion integrally having a backrest portion above, a seat member, and a front leg portion vertically rotatably attached to the front lower part of the seat member, which are foldably connected. It consists of a pair of left and right link mechanisms, a toggle mechanism interposed between the rear leg section and the front leg section, and a receiving means for receiving the rear part of the seat member when the chair is assembled. A first link rod whose rear end is pivotally connected to the side of the leg and whose front end is pivotally connected to an intermediate position on the lower side of the seat member, and a rear end is located near the front end of the fifth link rod. a second link rod that is pivoted and tilts downward and forward, and whose front end is pivoted to the side of the front leg; a third link rod whose rear end is pivotally connected to the side of the rear leg; and a first toggle whose rear end is rotatably pivotally connected to the rear leg; a link rod, a second toggle link rod whose rear end is pivotally connected to the front end, extends linearly, and whose front end is rotatably connected to the front leg; and when the chair is assembled, the first and second toggle link rods 2 The pivot point with the toggle link rod is the first
the first toggle link rod; The sum of the distance between the front and rear pivot points of the toggle link rod and the distance between the front and rear pivot points of the second toggle link rod is the rear end pivot point of the first toggle link rod in the assembled state of the chair. A folding chair characterized in that the second toggle link rod is formed to be slightly longer than the distance from the front end pivot portion. 2. The folding chair according to claim 1, wherein the receiving means has an engagement groove provided on the rear lower surface of the seat member to engage the first link rod of the link mechanism from above. 3. The folding chair according to claim 1 or 2, wherein the rear end pivot portions of the second link rods in the pair of left and right link mechanisms are connected by a shaft rod. 4. The folding chair according to claim 1 or 3, wherein the pressing piece also serves as a pivot rod. 5. Pivotally connect the rear end of the first toggle link rod to the rear end pivot joint of the first link rod, and pivotally connect the tip of the second toggle link rod to the attachment portion between the seat member and the front leg. A folding chair according to claims 1, 2, 3 and 4, comprising: