JP3081885U - Chair backrest position adjustment device - Google Patents

Abstract

(57) [Summary] [Problem] The position of the backrest can be adjusted back and forth, the structure is simple, and the operation of adjusting the position of the backrest is easy.
An object of the present invention is to provide a backrest position adjusting device for a chair that can reduce costs. SOLUTION: An angle adjusting means (2) is provided at a horizontal edge portion (11) of a hollow backrest supporting member (1) formed in a substantially L-shape, and the angle adjusting means (2) is two pieces. And a position adjusting rod (24) having a grip at one end. One end of each of the two plate-shaped base portions (21) is pivotally supported by the backrest support member (1), and a guide groove (22) and a locking groove (23) corresponding to the other end are formed, respectively. Adjusting rod (2
4) is inserted into the horizontal edge of the backrest supporting member from the guide groove, the elastic member (26) is fitted, and the end of the position adjustment rod is locked in the locking groove.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a backrest position adjusting device for a chair, and more particularly, to a device for adjusting the position of a backrest provided to be swingable with respect to a backrest support member.

[0002]

[Prior art]

 In a chair in which the backrest and the seat are connected by a backrest supporting member having a substantially L-shaped elasticity, when a user leans on the backrest and a load is applied to the backrest, the backrest supporting member is moved. When the user leans back and leans against the backrest, the angle of the backrest with respect to the seat becomes obtuse. Return to the angle.

There is also a chair in which a backrest is swingably supported on a seat body via an angle adjusting device. The angle adjusting device generally includes a pinion and a rack, and further includes members such as a spring, an operation lever, and a lock body.

In the chair in which the backrest and the seat are connected by the L-shaped backrest support member, the angle of the backrest with respect to the seat is temporarily adjusted when the user leans on the chair. Only the function of the so-called cushion is greater than the angle adjustment of the backrest, and there is no means for adjusting the angle or position of the backrest.

A chair in which the backrest is swingably supported on a seat body via an angle adjusting device requires a large number of members to constitute the angle adjusting device, and the manufacturing process is complicated. Therefore, there is a disadvantage that the manufacturing cost is increased. In addition, when the user attempts to adjust the position of the backrest according to his or her physique or the position where the user sits down, it is inconvenient because only the means for adjusting the angle of the backrest with respect to the seat are provided. You may feel it.

[0006]

[Problems to be solved by the invention]

 This invention has been developed to solve the drawbacks of the conventional chair in which the angle of the backrest with respect to the seat can be adjusted. That is, an object of the present invention is to provide a backrest position adjusting device for a chair that can adjust the backrest position back and forth according to a user's own physique or a customary sitting position. And

In addition, the present invention has a simple structure, has a small number of manufacturing steps, can reduce the cost, and can easily and reliably perform the position adjustment of the backrest of the chair. It is an object to provide a position adjusting device.

[0008]

[Means for Solving the Problems]

 A backrest position adjusting device for a chair comprising a backrest support member and a backrest position adjusting means. The backrest support member is a hollow pillar, and includes an upper end portion extending upward and swingably providing a backrest of the chair, and a horizontal edge portion extending curved and horizontally. At the position close to the end of the horizontal edge portion, holes are formed at opposing positions on both side surfaces. The angle adjusting means is provided at a horizontal edge of the backrest supporting member, and is constituted by two plate-shaped base portions and an angle adjusting rod having a grip portion formed at one end. The two base portions are arranged with the horizontal edge of the backrest support member sandwiched from the left and right, and one end is rotatably supported on the backrest member, and one of the other base portions is rotatably supported. An arc-shaped guide groove is formed at the end, and an arc-shaped guide groove is formed on the other base portion at a position facing the guide groove so that continuous unevenness is formed on both inner walls in the longitudinal direction. A guide groove is formed, and the seat supporting member is positioned on the horizontal edge of the backrest supporting member, and is fixed while being sandwiched by the upper edges of the two base portions. The position adjusting rod has a step formed at the front end thereof to be narrowed to form an insertion portion, and an edge portion of the insertion portion is further formed to be narrowed to form a locking end portion, and such a position adjusting rod is formed at the base portion. Through the hole at the horizontal edge, insert an elastic member into the insertion portion, and further provide a C-shaped fixing ring to position the elastic member. The locking end is passed through a hole in the other side surface of the horizontal edge and locked in a locking groove of one base.

[0009]

[Embodiment of the invention]

 The device for adjusting the backrest position of a chair according to the present invention is provided with an angle adjusting means at a horizontal horizontal edge of a hollow backrest supporting member formed in a substantially L-shape. It is composed of a plate-shaped base portion and a position adjustment rod having a grip portion formed at one end. In order to explain the structure and features of such a backrest position adjusting device for a chair, a specific embodiment will be described below with reference to the drawings.

[0010]

【Example】

 FIG. 1 discloses a perspective view of a device for adjusting a backrest position of a chair according to the present invention. According to the drawing, the device for adjusting the backrest position of a chair according to the present invention comprises a hollow substantially L-shaped backrest support member (1), a plate-like base portion (21) and a grip portion at one end. And a backrest position adjusting means (2) constituted by the position adjusting rod (24). The backrest support member (1) has a curved lower portion to form a horizontal edge portion (11), and a backrest position adjusting means (2) is provided on the horizontal edge portion (11). Further, a seat support member (3) for fixing the seat of the chair is provided at one end of the backrest position adjusting means by welding or the like.

[0011] The backrest position adjusting means (2) includes two plate-shaped base portions (21) (21) which are fixed while holding the horizontal edge portion (11) of the backrest support member (1) from right and left. 21) and a position adjusting rod (24) having a grip portion formed at one end. The base portions (21) and (21) rotatably support one end of the base member to the backrest member. An arc-shaped guide groove (22) is formed at the other end of the base portion (21), and an arc-shaped locking groove (23) facing the guide groove is formed in the other base portion (21). Then, on both inner walls of the other longitudinal direction of the locking groove (23), continuous irregularities are formed to face each other.

As disclosed in FIGS. 2, 3, and 4, the position adjusting rod (24) is formed into an insertion portion (25) by forming a step at a front end portion and making the insertion portion (25) narrow, and an edge portion of the insertion portion (25). Is further formed with a step to make it a locking end (28). When such a position adjusting rod (24) is provided in the angle adjusting means, holes are formed in both side surfaces of one end of the horizontal edge (11) of the backrest supporting member (1), and the position is adjusted. The adjustment rod (24) is passed through the hole of the horizontal edge portion (11) and the guide groove (22) of the base portion (21) in this order, and the elastic member (26) is inserted into the insertion portion (25). Further, a C-shaped fixing ring is further provided to position the elastic member (26) closer to the approaching direction within the horizontal edge portion (11) of the backrest support member (1). The locking end (28) of 24) extends from the hole formed in the other side surface of the horizontal edge portion (11) to the locking groove (23) of the base (21). In this case, a plurality of holes into which the locking end (28) of the position adjusting rod (24) just enters due to the concavo-convex unevenness formed continuously on both inner walls in the other longitudinal direction of the locking groove (23). A part is formed, and these holes are connected to each other by overlapping a part of the adjacent circumference, and communicate with each other to form an arc-shaped groove.

FIG. 5 discloses a mode of use of the backrest position adjusting device for a chair according to the present invention. According to the illustration, the upper end of the backrest support member (1) is provided so that the backrest (4) of the chair can swing freely, and the seat support member (3) is provided with the seat of the chair. When adjusting the position of the backrest (4), the position adjusting rod (24) is moved in the direction of the arrow shown in the figure. In more detail, as shown by the arrow in FIG. 4, the position adjusting rod (24) is pulled in the forward direction, and is further pushed down (or pulled up) to a desired height to adjust the position. The backrest support member (1) is linked to the rod (24), and the backrest (4) moves back and forth. When the position adjusting rod (24) is lightly pressed in this state, the locking end (28) of the position adjusting rod (24) is returned to its original position in the locking groove (23) by the urging force of the elastic body (26). After returning, the position of the backrest of the chair is adjusted.

Further, since the backrest is swingably provided on the backrest support member, the angle with respect to the seat is automatically adjusted in accordance with the posture in which the user leans on the backrest.

The above description is a preferred embodiment of the present invention and does not limit the scope of implementation of the present invention. Therefore, any modification, change, or the like that can be made by a person skilled in the art with respect to this invention and that has an equivalent effect to this invention shall fall within the scope of the claims of this invention.

[0016]

[Effect of the invention]

 The device for adjusting the backrest position of a chair according to the present invention can adjust the backrest position back and forth according to the user's own physique or the position where the user sits down according to custom, and the structure is simple. Therefore, the operation of adjusting the position of the backrest can be easily and reliably performed, the number of constituent members is small, the manufacturing process can be omitted, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a device for adjusting a backrest position of a chair according to the present invention.

FIG. 2 is an enlarged view of some constituent members of the backrest position adjusting device for a chair disclosed in FIG. 1;

FIG. 3 is a front view of the chair back position adjusting device disclosed in FIG. 1;

FIG. 4 is a diagram illustrating an operation of adjusting the position of the backrest in the apparatus of FIG. 1;

FIG. 5 is an explanatory diagram of a use mode of the apparatus of FIG. 1 and an operation thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backrest support member 11 Horizontal edge 2 Position adjustment means 21 Base 22 Guide groove 23 Locking groove 24 Position adjustment rod 25 Insertion part 26 Elastic member 28 Locking end 3 Seat support member 4 Backrest

Claims (1)

[Utility model registration claims] 1. A backrest position adjusting device for a chair comprising a backrest support member and a backrest position adjusting means, wherein the backrest support member is a hollow pillar, and extends upward. The upper back portion of the chair is provided so as to swing freely, and the horizontal edge portion extends in a curved and horizontal manner. The backrest position adjusting means is provided at a horizontal edge of the backrest support member, and has two plate-shaped base portions and a grip portion formed at one end thereof. The two base portions are disposed in a state where the horizontal edge of the backrest support member is sandwiched from right and left, and one end is rotatably supported on the backrest member. An arc-shaped guide groove is formed at the other end of the base, and other An arc-shaped guide groove is formed in the base portion at a position facing the guide groove so that continuous concave and convex portions are formed on both inner walls in the longitudinal direction to face each other, and the seat support member is provided with the backrest support member. The position adjusting rod is positioned on the horizontal edge portion of the base member and fixed while being sandwiched by the upper edge portions of the two base portions. The edge of the portion is further reduced in level to make it a locking end, and such a position adjusting rod is inserted from the guide groove of the base portion to penetrate the hole of the horizontal edge to form an elastic member. Is inserted into the insertion portion, a C-shaped fixing ring is further provided to position the elastic member, and the locking end is passed through a hole in the other side surface of the horizontal edge, and A backrest position adjusting device for a chair, wherein the backrest position adjusting device is locked in a locking groove of a base portion of the chair.