Tensioning structure of tensioner

Abstract

The present invention provides a tensioning structure of a tension member, which can manufacture a frame at a low cost without using complicated and expensive molds, and has a beautiful appearance, especially in a rear view and a side view, and the tension The installation work of the files is also simplified. In the tensioning structure (28) in which the tensioning element (28) is stretched on the surface of the back frame (27) as the frame body, the back frame (27) has: a main frame part (32), a tensioning A fastener (28) abuts against the surface of the main frame part (32); and an upper auxiliary frame part (33), which is fixed to at least a part of the back side of the main frame part (32), from The front surface of the main frame member (32) rolls the tension member (28) along the outer peripheral surface of the main frame member (32) and the outer peripheral surface, back and inner peripheral surface of the upper auxiliary frame member (33). Around, the peripheral portion of the tension member (28) is fixedly installed on the surface of the upper auxiliary frame part (33) opposite to the back side of the main frame part (32).

Description

technical field [0001] The present invention relates to a tensioning structure applicable to a backrest of a chair, a seat or a headrest, or a screen provided with a mesh, a partition, or the like. Background technique [0002] As a tensioning structure of a tension member such as a backrest of a chair, for example, there is a structure in which a pair of opposing edge portions of the tension member are rolled from the surface of a pair of frame rods opposing each other of the frame around the outer edge to the back. And, for the edge pieces that are fixedly installed on the two edge portions of the tensioning piece and have a hook-shaped portion at the front end, they are locked at the angle formed by the inner surface and the surface of the two frame bars. part, so that the tension member is tensioned on the frame body, or, for the edge parts fixedly installed on the other opposite pair of edge parts of the tension member, they are connected with the other opposite pair of...

AI Technical Summary

Problems solved by technology

[0008] In the structure described in Patent Document 1, since the edge member fixedly attached to the edge of the tension member must be formed into a hook shape, its manufacture is cumbersome, and it is also necessary to lock the hook-shaped edge member. Work at the corner formed by the inner side of the frame and the surface

[0009] With regard to the structure described in Patent Document 1, in which the edge member fixedly installed on the edge of the tension member is fitted into the groove provided on the outer peripheral surface of the frame, and the structure described in Patent Document 2, due to the use of The tension member covers the front portion of the outer peripheral surface of the frame body than the groove and exposes the rear portion of the outer peripheral surface of the frame body than the groove, so that the side surface of the backrest is divided in terms of shape design. For the front and back two parts, its appearance is not beautiful

[0010] In the structure described in Patent Document 3, since the concave part and the convex part are exposed on the back of the backrest etc., the appearance is not beautiful

[0011] In order to make the appearance of the back of the backrest etc. beautiful, it is preferable to form a groove on the inner peripheral surface of the frame, and make the edges of the tension member wound around the outer peripheral surface, the back surface, and the inner peripheral surface sequentially from the surface of the frame , and the edge parts fixedly installed on the edge of the tension member are fitted into the above-mentioned grooves, but in order to form such grooves on the inner peripheral surface of the frame made of synthetic resin, it must be cast When the core for forming the groove is detached toward the inside of the mold for forming the frame body, the mold for forming becomes complicated.

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