JPH0235236Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to auxiliary legs for a chair for expanding the installation area of the chair legs.

Conventional technology and its problems In order to increase the stability of the chair, it is necessary to increase the chair contact area, that is, the area of the surface created by connecting the outer edges of the chair legs that touch the installation surface, but if this is made too large, It may become bulky and cause trouble. Therefore, it would be convenient to have auxiliary legs that can be stored compactly, depending on how the chair is used, but can be used to expand the footprint when stability is required. However, conventionally there has been no auxiliary leg that can be easily stored and used.

The present invention was developed in response to these demands, and provides auxiliary legs for chairs that are normally stored compactly and can be used to expand the chair footprint as needed, with a simple structure and easy operation. The purpose is to provide.

Means for Solving the Problems The object of the present invention is to provide a chair that is rotatably attached to the chair leg so that it can be stored inward and extended outward when viewed from the center of the chair seat. The auxiliary leg includes an attachment part for attaching to the chair leg, and a grounding part located on both sides of the attachment part, and the grounding part has one end outside the chair leg and the other end when the auxiliary leg is extended. This is achieved by an auxiliary leg for a chair, characterized in that a portion of the auxiliary leg is in contact with the chair installation surface on the inner side of the attachment portion.

The auxiliary leg is rotatably attached to the attachment portion around a horizontal axis, and includes a pair of bent portions that bend and extend from the attachment portion in a vertical direction when attached to the chair leg. and a connecting portion that connects the bent portions to each other, and the grounding portion may be formed by either the bent portion or the connecting portion.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show a chair 1 equipped with an example of the auxiliary legs of the present invention. The chair 1 includes front legs 2 and rear legs 3 made of metal pipes, a seat portion 4, a backrest plate 5 rotatable around a horizontal axis 50, and auxiliary legs 6. The auxiliary leg 6 includes an attachment part 60 for rotatably attaching the auxiliary leg 6 to the rear leg 3 above the lower end of the rear leg 3 by a horizontal axis, and a pair of L's extending vertically from the attachment part 60 in a curved manner. Character-shaped bent portion 61
and a connecting portion 62 that connects the bent portions 61 to each other and extends in the horizontal direction. The extended state of the auxiliary leg 6 is shown in FIG. 1 (solid line), FIG. 2, and FIG. 3, and the retracted state is shown in FIG. 1 with a chain line. The bent portion 61 includes an inclined portion 610 extending obliquely forward from the attachment portion 60 in the extended state, and a horizontal portion 611 extending horizontally backward through a bending point at the tip of the inclined portion, and the tip of the horizontal portion 611 connects to the connecting portion 62. are interconnected by. The lower surface of the horizontal part 611 and the connecting part 62 forms a grounding part 63. The end of the grounding part 63 on the inclined part 610 side is on the front side of the attachment part 60, and the end on the side of the connecting part 62 is on the side of the rear leg 3. The back side touches the chair installation surface. In the extended state, the rear end of the ground contact portion 63 is prevented from moving upward due to the front end of the ground contact portion 63 coming into contact with the chair installation surface. As a result, the auxiliary legs 6 are maintained in the extended state against the load in the backward tilting direction of the chair. When stored, the connecting portion 62 contacts the chair installation surface to maintain the stored state.

Therefore, the auxiliary leg 6 is normally stored compactly between the front and rear legs, and can be extended as necessary. At the time of feeding out, the rear end of the grounding part 63 is restrained from vertical movement and comes into contact with the chair installation surface to expand the installation area and increase the stability of the chair. Further, the feeding operation is extremely easy as the rear legs 3 are raised from the floor or the like and the auxiliary legs 6 are rotated from the storage position. Further, since the pair of bending portions 61 are connected by the connecting portion 62, it is possible to extend and store the chair legs from each chair leg in one operation. Of course, the bending portions may not be connected to each other and may be operated individually for each chair leg. The ground contact portion may be formed by a bent lower surface, or may be formed by a connecting lower surface of one or both of the inner and outer ends of the bent portion, or a combination thereof.

In the above example, the auxiliary leg 6 is rotatable around the horizontal axis, but the direction of rotation is not limited to this and can be freely set. The auxiliary leg 6A shown in FIG. 4 has a mounting portion 60A having a vertical axis, and is supported by a horizontal member 30 extending between a pair of chair legs 3. Moreover, this auxiliary leg 6A does not have a connecting part and is composed of a single L-shaped bent part 61A. In the extended state shown in FIG. 4, the grounding portion 63 formed by the lower surface of the horizontal portion 611A is similar to the previous example.
An end portion on the side of the inclined portion 610A contacts the chair installation surface on the front side of the mounting portion 60A, and an end portion on the opposite side contacts the chair installation surface on the rear side of the rear legs 3. Thereby, the auxiliary leg 6A maintains the extended state against the load in the direction of tilting the chair backward. When storing the auxiliary leg 6A, the auxiliary leg 6A may be rotated around the vertical axis of the mounting portion 60A as shown by arrows A and B so that the bent portion 61A is aligned with the horizontal member 30. The horizontal member 30 extends with a step in the front-rear direction of the chair so that the pair of bent portions 61A can be accommodated in parallel.

Although the explanation has been given above using an example of expansion toward the rear of the chair, it goes without saying that the auxiliary leg of the present invention can be provided so as to expand in any appropriate direction, such as toward the front or side of the chair. In fact, as shown in FIG. 1, the auxiliary leg of the present invention is attached to the rear leg 3 of a chair whose backrest plate 5 can rotate around a horizontal axis, and when the auxiliary leg is extended, the rear end of the ground contact part is closer to the backrest plate support shaft 50. If the chair is positioned backwards, the seater can use the backrest plate to take a posture that is not possible with a normal chair, for example, as shown in Figure 5, without fear of falling backwards. It is possible to obtain excellent effects such as: In order to more reliably prevent this backward fall, the position of the rear end of the ground contact part of the extended auxiliary leg should be at least 5 cm behind the position of the backrest plate support axis when the seater is tilting back to the maximum. desirable. Furthermore, in order to avoid unnecessary size, it is desirable that the distance be 20 cm or less from the position of the support shaft.

Effects of the Invention As is clear from the above, the present invention provides an auxiliary leg for a chair that has a simple structure and is easy to operate, which can be normally stored compactly and used to expand the chair footprint when necessary. can be provided.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of an example of a chair equipped with auxiliary legs, Fig. 2 is a rear view thereof, and Fig. 3 is a perspective view mainly showing the auxiliary legs. FIG. 4 is a perspective view showing another example of a chair equipped with auxiliary legs, centering on the auxiliary legs, and FIG. 5 is a side view showing one example of use of the chair shown in FIG. 1. 1...Chair, 2...Front legs, 3...Back legs, 6,6
A... Auxiliary leg, 60, 60A... Mounting part, 6
1,61A...Bending part, 62...Connecting part, 63...
...Grounding part.

Claims (1)

[Scope of claim for utility model registration] An auxiliary leg for a chair that is rotatably attached to the chair leg so that it can be stored inward and extended outward when viewed from the center of the seat of the chair, It includes an attachment part for attaching to the leg, and a grounding part existing on both sides of the attachment part, and the grounding part has one end outside the chair leg and the other end inside the attachment part when the auxiliary leg is extended. An auxiliary leg for a chair, characterized in that the auxiliary legs are in contact with the chair installation surface. The mounting portion is rotatably mounted around a horizontal axis, and a pair of bent portions extend from the mounting portion in a vertical direction when attached to a chair leg, and the bent portions are connected to each other. 2. The auxiliary leg for a chair according to claim 1, wherein the auxiliary leg for a chair is provided with a connecting portion that communicates with the auxiliary leg, and the grounding portion is formed by either the bending portion or the connecting portion.