JPH09252870A - Opening/closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clothes from being pinched by properly covering the exposed portion of a connection section in the opening/closing mechanism of a folding chair. SOLUTION: The base end section 3a of a link member 3 fitted with a cover member 7 is inserted into the window hole 2a of a base member 2 and rotatably supported on a pin 4. An oblong hole 8b and a projection 8c extended toward the center line of the pin 4 are formed on the cover member fitting section 8 of the link member 3, and the cover member 7 is provided with a slide face kept in slide contact with the base member 2, a through section inserted with the base end section 3a, a boss 7c coupled with the oblong hole 8b, and a cam face 7d coupled with the projection 8c. The cover member 7 driven by the link member 3 is displaced in the oblong hole 8b by the quantity specified by the cam face 7d and the projection 8c, and the cover member 7 can be slid along the base member 2 in the adhesive state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing mechanism including a cover member that covers an exposed portion of a connecting portion.

[0002]

2. Description of the Related Art An example of a conventional folding chair having a slide link type opening / closing mechanism will be described. In FIG. 7, a pipe-shaped rectangular frame-shaped base member 2 is rotatably attached to a side intermediate position of the seat portion 1, and a lower portion of the base member 2 serves as a front leg and an upper portion serves as a backrest. A window hole 2 a is formed in the base member 2 at a position higher than the seat portion 1, and the base end portion 3 of the rotating member 3 is formed.
A is inserted into the window hole 2a and is rotatably supported by a pin 4 serving as a support shaft to form a connecting portion. The tip portion 3c of the rotating member 3 is inserted into the upper opening of the rear leg 5 made of a pipe in a substantially downward posture, and the intermediate portion of the rear leg 5 is connected to the seat portion 1 side via the connecting portion 6. It is rotatably connected near the rear end of the unit.

The operation of the opening / closing mechanism in the vicinity of the connecting portion is shown in FIG. In the figure, (a) shows a state in which the legs of the folding chair are closed, (b) shows a state in which the legs are half opened, and (c) shows a state in which the legs are open.

[0004]

By the way, the above-mentioned window hole 2
It is necessary that a has a size corresponding to the movable range of the base end portion 3a of the rotating member 3, and the reciprocating movement of the base end portion 3a in the window hole 2a causes the gap S to be widened or narrowed. (See Figure 8). Therefore, clothes or the like may be mistakenly caught in the gap S during the opening / closing operation. Further, if the window hole 2a is exposed, it does not look good and is inferior in design. The present invention is to solve the above problems, and an object of the present invention is to provide an opening / closing mechanism in which an exposed portion of a connecting portion of the opening / closing mechanism is appropriately covered with a cover member.

[0005]

[Means for Solving the Problems] To solve this problem, the following opening / closing mechanism was created. That is, the invention of claim 1 is an opening / closing mechanism in which a rotating member is rotatably connected to a base member, and a cover member having a shape that covers an exposed portion of the connecting portion is provided in the rotating member. There
A guide mechanism is provided between the cover member and the rotating member to displace the cover member to a position where the cover member is substantially in close contact with the base member when the rotating member rotates. I am trying.

In the above-mentioned opening / closing mechanism, when the rotating member rotates with respect to the base member, the guide mechanism displaces the cover member to a position in which the cover member is in close contact with the base member, so that the cover member floats from the base member. Therefore, there is no gap between the cover member and the base member.

According to a second aspect of the present invention, in the opening / closing mechanism according to the first aspect, the guide mechanism includes a guide path formed in the rotating member and extending toward a connecting axis of the connecting portion, and the cover member. A boss that is engaged with the guide path and that allows the cover member to be displaced in the direction in which the guide path extends in a state in which the cover member is rotatable about an axis parallel to the connecting axis; And a cam which is provided between the rotating members and which regulates the amount of positional displacement of the cover member when the rotating members rotate.

When the rotating member rotates with respect to the base member, the cover member that covers the exposed portion of the connecting portion moves in accordance with the rotating member, and at the same time, the cam operates to move the cover member substantially with respect to the base member. The position is displaced to the position where they come into close contact. That is, the cover member is engaged with the rotating member via the boss, the guide path, and the cam, and is displaced by a specified amount in the direction of the line segment connecting the connecting axis and the center line of the boss and the connecting axis. By rotating about parallel axes, the sliding contact state with the base member is maintained. Therefore, it is possible to configure an opening / closing mechanism in which there is no large gap between the rotating member and the cover member and between the cover member and the base member, and the rotation of the rotating member is not hindered by the cover member.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a slide-link type folding chair, and FIG. 2 is a cover member (shown by an imaginary line).
It is a principal part expanded perspective view which removed. As shown in both figures, a rectangular frame-shaped base member 2 made of a pipe is rotatably attached to an intermediate position on a side of the seat 1, and the lower part of the base member 2 is a front leg and the upper part is a backrest. . A substantially rectangular window hole 2a is formed in the base member 2 at a position higher than the seat mounting position, and the base end 3 of the link member 3 (which will be described later in detail) is formed.
A is inserted into the window hole 2a and is rotatably supported by a pin 4 serving as a support shaft to form a connecting portion. The tip portion 3c of the link member 3 is inserted into the upper opening of the rear leg 5 made of a pipe in a substantially downward posture, and the intermediate portion of the rear leg 5 is connected to the seat portion 1 side via the connecting portion 6. It is rotatably connected near the rear end of the unit.

The link member 3 is fitted with a cover member 7 that simultaneously covers the exposed portion of the connecting portion, that is, the base end portion 3a of the link member 3 and the window hole 2a. The cover member 7 will be described in detail below. Is driven by the link member 3 and the base member 2
Slide along. The link member 3 is the rotating member in the present invention.

Next, the link member 3 and the cover member 7
Will be described in detail. The shape of the link member 3 is shown in FIGS. 3 and 4, and the shape of the cover member 7 is shown in FIG. The link member 3 has an insertion hole 3 into which the pin 4 is inserted in the base end portion 3a.
3d having an intermediate portion 3b between the proximal end portion 3a and the distal end portion 3c.
A cover member mounting portion 8 is formed on the. On the circular flat surface 8a of the cover member mounting portion 8, a track-shaped elongated hole 8 extending toward the center line of the insertion hole 3d, that is, the center line of the pin 4.
b is formed, and the protrusion 8 is provided on the outer peripheral portion of the cover member mounting portion 8 at a position on the center line connecting the elongated hole 8b and the insertion hole 3d.
c is formed. The elongated hole 8b is an example of the guide path according to the present invention.

On the other hand, the cover member 7 has a sliding contact surface 7a formed so as to be capable of sliding contact with the base member 2, a penetrating portion 7b into which the base end portion 3a of the link member 3 is inserted, and the base end portion 3a. Is formed so that it can be slidably contacted with the protrusion 8c of the link member 3 and the boss 7c for engaging the elongated hole 8b of the link member 3 to support the cover member 7 in a rotatable and slidable manner. The cam surface 7d is provided. The protruding portion 8c and the cam surface 7d are the cam referred to in the present invention.

In assembling the opening / closing mechanism configured as described above, the base end portion 3a of the link member 3 is inserted into the penetrating portion 7b of the cover member 7, and the boss 7c is fitted into the elongated hole 8b. The base end portion 3a in that state is inserted into the window hole 2a of the base member 2 and supported by the pin 4. At this time, the projection 8c of the link member 3 and the cam surface 7d of the cover member 7 are in a positional relationship of contacting each other. The tip portion 3 of the link member 3
c is inserted into the upper opening of the rear leg 5.

When the opening / closing mechanism operates, that is, when the base member 2 and the link member 3 rotate, the projection 8c of the link member 3 slides on the cam surface 7d of the cover member 7, and the engagement end position is reached. It relatively slides between 7e ₁ and 7e ₂ , whereby the cover member 7 is displaced along the elongated hole 8b in the direction orthogonal to the axis of the pin 4. That is, the elongated hole 8b, the boss 7c, the cam surface 7d, and the protrusion 8c constitute a guide mechanism as referred to in the present invention.
For the shape of the link member 3, see FIG.
Is set so that the change in the distance between the cover member mounting portion 8 and the base member 2 depending on the rotation angle position can be offset (compensated), and the cover member 7 of the link member 3 It is designed to prevent the base member 2 from being lifted by the rotation. Since the cover member 7 slides along the base member 2 and does not rotate, the boss 7c moves in the elongated hole 8b while being rotationally displaced with respect to the link member 3 when the cam is operated. . It should be noted that 8d in FIGS. 3 and 4 is a guide groove for facilitating fitting of the boss 7c into the elongated hole 8b during assembly.

Now, the operation of the opening / closing mechanism constructed as described above will be described. FIG. 6A is a partial view of the folding chair with the legs closed. From this state, when the legs are brought into the half-opened state shown in FIG. 2B, the link member 3 rotates around the pin 4 together with the rear legs 5, and the cover member 7 is lifted by the link member 3 to the upper position in the figure. At this time, as described above, the cover member mounting portion 8 is displaced in the direction away from the base member 2 as the link member 3 rotates, but the cover member 7 projects through the cam surface 7d. Since it is in sliding contact with the portion 8c, the amount of positional displacement is regulated, and it slides along the base member 2 without rising from the base member 2.

Subsequently, when the half open state of FIG. 6B is changed to the fully open state shown in FIG. 6C, the cover member 7 is further lifted to the upper position in the drawing by the link member 3, and the cover member mounting portion 8 is shown. Is displaced in a direction approaching the base member 2, but the boss 7c can move in the elongated hole 8b, and the cam surface 7d and the projection 8c are slidably contacted with each other, whereby the cover member 7 is displaced. The amount is regulated, and a proper contact state with the base member 2 is maintained, so that the base member 2 slides smoothly without increasing the friction and hardening.

When the above-mentioned opening / closing mechanism is operated, the tip portion 3c of the link member 3 projects in and out of the upper opening portion of the rear leg 5, and the rear leg 5 and the base member 2 (front leg) form the seat portion 1. Rotate relatively.

In the above-mentioned opening / closing mechanism, the connecting portion is substantially housed in the base member 2, and the cover member 7 is configured to be driven by the link member 3 and slide along the base member 2. The window hole 2a can be covered without a gap by the cover member 7 which is relatively small. Moreover, the guide mechanism for preventing the cover member 7 from being lifted up from the base member 2a has a small number of parts including the boss 7c and the cam surface 7d on the cover member 7 side and the elongated hole 8b and the protrusion 8c on the link member 3 side. It has a simple structure. Further, since the cover member 7 slides along the base member 2 in a close contact state, it is not necessary to form the cover member 7 excessively as compared with the window hole 2a. Therefore, the cover member 7 can appropriately cover the exposed portion of the connecting portion to prevent the clothes from being pinched, and enhance the design of the opening / closing mechanism.

Although the opening / closing mechanism applied to the slide-link type folding chair has been described in the above embodiment, the opening / closing mechanism of the present invention basically comprises the base member 2, the link member 3 and the cover member 7. Therefore, it can be used as a general opening / closing mechanism other than the slide link type. Further, the invention is not limited to chairs, and can be widely applied to folding desks, doors, lids and the like.

[0020]

As described above, according to the present invention,
Since the exposed portion of the connecting portion of the opening / closing mechanism is covered by the cover member provided on the link member, and there is no large gap between the rotating member and the cover member or between the cover member and the base member even during the opening / closing operation, It is possible to prevent clothes from being pinched and improve the design.

[Brief description of drawings]

FIG. 1 is a perspective view of a folding chair according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of a folding chair.

FIG. 3 shows a shape of a link member, (a) is a front view,
(B) is a side view.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 shows the shape of a cover member, (a) is a front sectional view, (b) is a side view, and (c) is a bottom view.

6A and 6B are enlarged views of a main part for explaining the operation of the opening / closing mechanism of the folding chair, where (A) is a state in which the legs are closed, (B) is a state in which the legs are half opened, and (C) is the legs are opened. It is in a state.

FIG. 7 is a perspective view illustrating a conventional folding chair.

FIG. 8 is an enlarged view of a main part for explaining the operation of the opening / closing mechanism of the folding chair according to the conventional example, in which (a) is a state in which the legs are closed,
(B) shows the legs half-open, and (C) shows the legs open.

[Explanation of symbols]

 1 seat portion 2 base member 3 link member (rotating member) 4 pin 5 rear leg 7 cover member 7c boss 7d cam surface (cam) 8 cover member mounting portion 8b elongated hole (guide path) 8c protrusion (cam)

Claims (2)

[Claims] 1. An opening / closing mechanism in which a rotating member is rotatably connected to a base member, and a cover member having a shape for covering an exposed portion of the connecting portion is provided on the rotating member.
An opening / closing mechanism is provided between the cover member and the rotating member, and a guide mechanism is provided for displacing the cover member to a position where the cover member is substantially in close contact with the base member when the rotating member rotates. 2. The guide mechanism includes a guide passage formed in the rotating member and extending toward a connecting axis of the connecting portion, and a guide passage formed in the cover member, which engages with the guide passage to cover the cover member. A boss that is provided between the cover member and the rotating member and that can be displaced in a direction in which the guide path extends in a state of being rotatable about an axis parallel to the connecting axis, and the rotating member rotates. The opening / closing mechanism according to claim 1, further comprising a cam that defines a positional displacement amount of the cover member.