JPH0653085B2 - Folding chair - Google Patents

Description

TECHNICAL FIELD The present application relates to folding chairs, particularly suitable for wooden chairs and the like.

Conventionally, between the middle part of the left and right leg rods of the front leg part, which is formed by bending a metal pipe downward in a U shape and attaching a back support plate to the upper part,
The upper ends of the left and right leg rods of the rear leg formed by bending the metal pipe in a square shape and pivotally mounting the rear part of the seat part having a seat plate on the upper surface, and bending the metal pipe in an upward U-shape. To 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 to each other via link rods, and the front leg portion and the rear leg portion open in an inverted V shape during assembly. A folding chair having a structure in which the seat is supported horizontally is also widely used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the folding chair configured as described above, since the material is configured by the metal pipe, not only does it give an impression as an auxiliary chair as an appearance,
It is not suitable as a chair for use in conference rooms or dining rooms that use a wood tone as a basic tone or express a luxurious atmosphere, and for example, a seated person leans back and the front leg of the chair floats above the ground surface. If you do, the seat will rotate upwards,
There were inconveniences such as lack of safety such as the seated person falling behind.

Therefore, the present application enables efficient manufacturing, and
It is an object of the present invention to provide a folding chair that can be easily constructed of wood, and can be configured as a normal chair that stands upright with its front legs in a substantially vertical state, and that also provides stability.

Means for Solving the Problems In order to solve the above problems, the present application is directed to a wooden chair body including a rear leg portion integrally having a backrest portion above, a rectangular seat member, and a front leg portion. And a pair of left and right metal link units that connect these in a foldable manner,
The link unit includes a seat attachment piece that is long in the front-rear direction and is attached to the lower left and right positions of the seat member, and a vertically long rear leg attachment piece that is attached to the side surface of the middle portion of the leg rod of the rear leg. An upper leg portion is rotatably pivoted to a front end of the seat attachment piece and extends downward, and a front leg attachment piece fixed to upper side surfaces of the left and right leg rods of the front leg portion; and a rear leg attachment piece of A first end in which a rear end is rotatably pivotally attached to an upper end portion, and a front end is pivotally attached to an intermediate position in the front-rear direction of a seat member attachment piece.
A link rod and a rear end of the first link rod are rotatably pivotally attached to a position near the front end of the first link rod and are inclined downward and forward, and the front end of the link rod is pivotally attached to a lower portion of the front leg attachment piece. A second link rod and a front end of the second link rod are pivotally attached to a position near the rear end of the second link rod so as to be tilted downward, and a rear end of the second link rod is pivotally attached to a lower end of the rear leg attachment piece. The present invention provides a folding chair, characterized in that the folding chair comprises a third link rod that is worn and that has a receiving means for receiving the rear portion of the seat member when assembling the chair. Is provided on the lower surface of the rear portion of the seat member, and has an engaging groove at the end portion for engaging the first link rod from above.
The rear end part pivotally connecting parts of the link rod are connected by an axial rod, and a holding piece which is engaged with the axial rod when the chair is assembled is fixedly provided on the lower surface of the seat member. In order to solve the above-mentioned problems, a wooden chair body composed of a rear leg portion integrally having a backrest portion above, a rectangular seat member, a front leg portion, and a metal member that foldably connects them. A rectangular seat mounting frame in which the link unit is mounted on the lower part of the seat member, and a vertically long left and right mounted on the intermediate side surface of each leg rod of the rear leg. An upper end of each of the pair of rear leg mounting pieces and the front ends of the left and right frame rods of the seat mounting frame is rotatably pivoted and extends downward to be attached to an upper portion of the left and right leg rods of the front leg. The pair of left and right front leg mounting pieces and the rear ends of the rear leg mounting pieces are rotatable at their upper ends. And a pair of left and right first link rods whose front ends are rotatably pivoted at intermediate positions of the left and right frame rods of the seat mounting frame, and rear ends of the left and right first link rods near the front ends. Each of them is rotatably pivoted and tilted downward and forward,
A pair of left and right second link rods whose front ends are rotatably pivoted to the lower parts of the front leg mounting pieces, respectively, and pivotally pivoted to the front ends of the left and right second link rods near the rear ends thereof. And a pair of left and right third link rods, each of which is attached to the lower leg of the rear leg attachment piece so as to be pivotally attached to the lower end portion of the rear leg attachment piece, and is attached to the rear portion of the seat member when the chair is assembled. The present invention provides a folding chair characterized by having a receiving means for receiving the receiving means, wherein the receiving means is provided on the lower surface of the rear portion of the seat member, and the first link rod is engaged with the end portion from above. The pair of left and right second link rods are connected at their rear end pivot joints by means of a shaft rod, and the lower surface of the seat member is connected to the shaft rod at the time of assembling the chair. The holding piece to be engaged is fixedly provided.

When the folding chair is constructed, in claim 1, the pair of left and right link units are individually assembled and adjusted, and then the seat attachment piece is placed at the lower left and right positions of the seat member. In No. 4, the link units are independently assembled and adjusted, and then attached to the lower portions of the seat members, respectively, and the front leg mounting pieces are fixed to the upper side surfaces of the left and right leg rods so that the front leg portions can rotate with respect to the seat members. The rear leg mounting piece is fixed to the side surfaces of the intermediate portions of the left and right leg rods, and the seat member is rotatably attached to the rear leg portion.

When the chair is folded from the assembled state shown in FIGS. 1 and 2, the rear part of the seat member is pulled upward to release the engagement between the receiving means, that is, the first link rod and the engagement groove. To do. Then, the seat member rotates in the upright direction, the first link rod and the third link rod rotate counterclockwise, and the second link rod rotates clockwise, respectively, and the seat member and the front leg portion are rotated. And extend in a straight line and are folded flat as shown in FIG.

Next, when assembling the chair from the folded state shown in FIG. 3, the rear portion of the seat member is pushed down so that the seat member and the front leg portion bend. Then, the seat member is laid down horizontally, and the first link rod and the third link rod are rotated clockwise, and the second link rod is rotated counterclockwise to bring the seat member into a horizontal state. When this occurs, the receiving means, that is, the first link rod and the locking groove are engaged with each other so that the rear portion of the seat member is received.
As shown, the chair is assembled. In this state, for example, even when a seated person leans back and lifts the front leg of the chair above the ground contact surface, the seat member is not likely to rotate upward and buckle. When the pair of left and right link units are connected by the shaft rod, the pair of left and right link units can be rotated, and the engaging portion of the holding piece engages with the shaft rod to link in the assembled state. The unit and the seat member are integrated.

Embodiment Hereinafter, referring to the drawings, an embodiment of the present application will be described in detail. A is a rear leg portion (1), a seat member (2), and a front leg portion (3) vertically installed at a front end position of the seat member (2). 2 shows a wooden chair body composed of and the rear leg part (1) is a long vertical rod (4) a, (4) b.
A backrest (6) a, which is curved backward, is installed between the upper ends of the upper and lower parts, and a horizontal crosspiece (6) b is installed between the lower parts of the left and right leg rods (4) a, (4) b to connect them to the upper part. It has a backrest part (5) integrally with the left and right leg rods.
The upper and lower parts of (4) a and (4) b are inclined backward.
The seat member (2) is formed by mounting a cushion (8) on the upper surface of a wooden pedestal base (7), and the front leg portion (3) has left and right leg rods (9) a, ( 9) The middle part of b is fixed by a horizontal rail (10). B and B are the rear leg (1), the seat member (2) and the front leg.
(3) is a pair of left and right metal link units that are foldably connected to each other and are symmetrical with respect to the left and right. The link unit B has an inverted L-shaped cross section and extends in the front-rear direction. A seat portion attachment piece (11) fixed by screws at left and right symmetrical positions on the lower surface of the seat base (7) of the seat member (2) and extending vertically, and upper and lower end portions are stepped portions ( 12) a rear leg mounting piece (12) that is bent via a, and an intermediate portion is fixed to the inner surface of the intermediate portion of the leg rod (4) of the rear leg portion (1) via screws, respectively. It extends vertically, and the upper and lower ends are bent via the step (13) a, and the tip of the upper end is further bent via the step (13) b. The seat attachment piece (11) is pivotally attached (14) to the front end of the seat attachment piece (11) so as to be vertically rotatable, and the upper and lower ends are located inside the upper ends of the leg rods (9) a and (9) b of the front leg (3). The front leg mounting piece (13) fixed to the side surface with screws and the rear leg mounting Attachment (1
1) A metal rod having a rear end pivotably pivoted vertically on the upper part of 2) and a front end pivotally pivoted vertically midway on the seat attachment piece (11) in the front-rear direction. The rear ends of the link rods (15) and the first link rods (15) are pivotally attached (16) to the front ends of the positions closer to the front ends so as to be vertically rotatable, and the front ends are stepped ( 17) a second link rod (17) made of a metal rod which is bent by the a and pivotally rotatably attached to the inner surface of the lower portion of the front leg attachment piece (13), and the rear of the second link rod (17) The front end is rotatably pivoted to each outer surface near the end and tilted downward, and the rear end is bent by the step (18) a, and the lower end of the rear leg mounting piece (12) is And a third link rod (18) made of a metal rod pivotably attached to the seat. The rear end portion of the seat attachment piece (11) is bent at a right angle inward, and Above the first link rod (15) on the piece (19) Ri engaging groove intervention (20) is provided. Reference numeral (21) denotes a shaft rod that connects the pivotally-attached portions (16) of the first link rod (15) and the second link rod (17) to each other to make the left and right link units B and B continue to move.
(22) is fixed to the lower surface of the pedestal (7) at an intermediate position in the front-rear position direction, and the lower part of the shaft rod (2
1) Engagement part consisting of a pair of claw pieces that are engaged so as to sandwich
6 shows a holding piece with (23).

Then, first, when constructing a folding chair, the upper piece of the seat attachment piece (11) of the link units B and B, which are individually manufactured and adjusted, are screwed to the left and right positions on the lower surface of the stand (7). The pair of left and right link units B and B are symmetrically attached to the lower left and right positions of the seat member (2) by fixing them through the outer surface of the upper and lower end portions of the front leg mounting pieces (13) and (13). The left and right leg rods (9) a, (9) b of the front leg portion (3) are fixed to the upper side surfaces of the front leg portion (3) with screws, and the front leg portion (3) is rotatably attached to the seat member (2). In addition, the outer side surface of the intermediate portion of the rear leg mounting pieces (12) and (12) is attached to the rear leg portion.
The seat member (2) is rotatably attached to the rear leg (1) by being fixed to the side surface of the intermediate portion of the leg rod (4) of (1) via screws.

When the chair is folded from the assembled state shown in FIG. 1 and FIG. 2, the rear part of the seat member (2) is pulled upward so that the engagement between the holding piece (22) and the shaft rod (21). The engagement is released and the engagement between the receiving means, that is, the first link rod (15) and the engagement groove (20) is also released. Then, the seat member (2) rotates in the upright direction, the first link rod (15) and the third link rod (18) rotate counterclockwise, and the second link rod (17) rotates clockwise. Each of them rotates, and the seat member (2) and the front leg portion (3) linearly extend and are folded into a flat shape as shown in FIG.

Next, when the chair is assembled from the folded state shown in FIG. 3, the rear portion of the seat member (2) is pushed down so that the seat member (2) and the front leg portion (3) are bent at a right angle. Then, the seat member (2) is laid down horizontally, and the first link rod (15) and the third link rod (18) turn clockwise and the second link rod (17) turns counterclockwise. When the seat member (2) is moved, and the seat member (2) is in a horizontal state, the engaging portion (23) of the holding piece (22) engages with the shaft rod (21) to form a pair of links with the seat member (2). The unit B is integrated and the receiving means, that is, the first link rod (15) and the engaging groove (20) are engaged with each other so that the rear portion of the seat member (2) is received and the state shown in FIG. , The chair is assembled. In this state, for example, even when a seated person leans back and lifts the front leg of the chair from the ground contact surface, the seat member (2) is not likely to rotate upward and buckle.

FIG. 6 shows another embodiment of the present application. The difference from the above-mentioned first embodiment lies in the seat attachment parts (11), (11) of the left and right link units B, B in the first embodiment. Instead, the left and right frame rods (3
0) and (30) and the front and rear frame rods (31) and (31) form a square seat portion mounting frame (32), and the front leg mounting pieces (13) are attached to the left and right frame rods (30) and (30). ), (13) and the first link rod (15) are respectively attached to form a single link unit B ', and other points are basically different from those of the first embodiment. In addition, the folding and assembling operations of the chair are performed in the same manner as in the first embodiment.

As described above, according to the present application, the seat attachment piece, the front leg attachment piece, the first link rod and the second link rod, and the rear leg attachment piece, the first link rod, the second link rod, and the third link rod. Since there are link devices each of which comprises a four-bar rotation mechanism with the link rod in the link unit, the link unit can be separately assembled and adjusted by distinguishing it from the wooden chair body, and the rear legs, Since it is fixed to the seat member and the front leg portion only by the fastener and there is no pivotally attached portion, efficient manufacturing can be performed, and particularly, the rear leg portion, the seat member and the front leg portion are made of wood, This is effective when the link unit is made of metal, and smoothness of the folding operation can be expected, and the front leg and the rear leg having a backrest stand upright almost vertically, and the seat is placed above it. Ordinary with horizontal members Since it can be assembled into a chair, it does not feel uncomfortable with other chairs, and since the lower surface of the rear portion of the seat member is received by the receiving means, it has advantages such as good stability in use. Further, when the rear end pivotally connecting parts of the second link rod are connected by the shaft rod, the link rods at the left and right positions move together, and when the shaft rod is engaged by the holding piece, the link unit and the seat are attached. Integration with the member is obtained to increase mechanical strength, and particularly in the folding chair according to claim 4,
The seat mounting frame has advantages such as providing a mechanically superior chair.

[Brief description of drawings]

The drawings show an embodiment of the present application, FIG. 1 is a longitudinal sectional view showing an assembled state, FIG. 2 is a partially cutaway front view showing the assembled state, and FIG. 3 is a longitudinal sectional view showing a folded state. FIG. 4 is a side view of the link unit in an assembled state, FIG. 5 is a cross sectional view of the assembled link unit, and FIG. 6 is a vertical sectional view of the link unit in another assembled state. In the figure, (1) is the rear leg, (2) is the seat member, (3) is the front leg,
(4) and (9) are the rods, (5) is the backrest, (1) is the seat attachment piece, and (12)
Is a rear leg mounting piece, (13) is a front leg mounting piece, (15) is a first link rod, (16) is a pivotally attached portion, (17) is a second link rod, and (18) is a third link rod, ( (20) is an engaging groove, (21) is a shaft rod, (22) is a holding piece, and (3
(0) is a frame rod, (32) is a seat mounting frame, A is a chair body, and B and B '.
Is a link unit.

Claims (6)

[Claims] 1. A rear leg portion integrally having a backrest portion on an upper side,
It is composed of a rectangular chair member, a wooden chair body composed of front legs, and a pair of left and right metal link units that foldably connect the chair members. A seat attachment piece that is long in the front-rear direction and is fixed to a position, a vertically long rear leg attachment piece that is fixed to the side surface of the middle portion of the leg rod of the rear leg, and an upper end portion at the front end of the seat attachment piece. A front leg mounting piece that is rotatably pivoted and extends downward and is fixed to the upper side surfaces of the left and right leg rods of the front leg section, and a rear end is rotatably pivotally attached to the upper ends of the rear leg mounting pieces. And a first link rod whose front end is pivotally mounted at an intermediate position in the front-rear direction of the seat member mounting piece, and a rear end is pivotally mounted at a position close to the front end of the first link rod. Then, tilt downward and forward, and pivotally attach its front end to the lower part of the front leg attachment piece. A second link rod and a front end of the second link rod are pivotally attached to a position near the rear end of the second link rod so as to be tilted downward, and a rear end of the second link rod is pivotally attached to a lower end of the rear leg attachment piece. A folding chair comprising: a third link rod which is worn, and a receiving means for receiving a rear portion of a seat member when the chair is assembled. 2. The folding chair according to claim 1, wherein the receiving means is provided on the lower surface of the rear portion of the seat member, and the end portion has an engaging groove for engaging the first link rod from above. 3. A holding piece for connecting the rear end pivot joints of the second link rods of the pair of left and right link units by means of an axle rod and engaging with the lower surface of the seat member with the axle rod when the chair is assembled. The folding chair according to claim 1 or 2, wherein the folding chair is fixed. 4. A rear leg portion integrally having a backrest portion on an upper side,
A rectangular chair member comprising a rectangular seat member, a wooden chair body including front legs, and a metal link unit that foldably connects the chair member, and the link unit is attached to a lower portion of the seat member. Seat mounting frame, a pair of vertically extending left and right rear leg mounting pieces that are respectively mounted on the intermediate side surfaces of the leg rods of the rear leg, and upper end portions at the front ends of the left and right frame rods of the seat mounting frame. And a pair of left and right front leg mounting pieces that are pivotally attached to each other and extend downward and are respectively attached to the upper portions of the left and right leg rods of the front leg section, and the rear ends are respectively rotated to the upper end portions of the rear leg mounting pieces. A pair of left and right first link rods that are rotatably pivotally attached, and the front ends thereof are pivotally attached to intermediate positions of the left and right frame rods of the seat mounting frame, respectively, and the front end portions of the left and right first link rods are close to each other. The rear ends of the front leg mounting pieces are rotatably pivoted at the respective positions and inclined downward and forward, and the front ends of the front leg mounting pieces are And a pair of left and right second link rods pivotally attached to the respective parts, and left and right second link rods pivotally attached to the front ends of the rear end portions of the second link rods, respectively, and tilted downward, A pair of left and right third link rods whose ends are rotatably pivoted to the lower ends of the rear leg mounting pieces, respectively, and provided with a receiving means for receiving the rear portion of the seat member when the chair is assembled. Folding chair characterized by. 5. The folding chair according to claim 4, wherein the receiving means is provided on the lower surface of the rear portion of the seat member, and the end portion has an engaging hole for engaging the first link rod from above. 6. A pair of left and right second link rods, which are pivotally connected to each other at the rear ends thereof, are connected by a shaft rod, and a holding piece which is engaged with the shaft rod at the time of assembling the chair is fixed to the lower surface of the seat member. The folding chair according to claim 4, which comprises: