Stretching structure of a tension member for a chair

摘要

An engagement protrusion (20) extending in the front/back direction of a frame body (13) is provided on one of the opposing surfaces of a notch (16) in the frame body (13) and a fitting member (17) opposite said notch; similarly, an engagement recess (13h) in which the engagement protrusion (20) fits is provided on the other of said surfaces. By means of the moment of the fitting member (17) resulting from the tension of a tension member (14), the engagement protrusion (20) and the engagement recess (13h) are prevented from separating.

主权项

1. A stretching structure of a tension member for a chair, the stretching structure comprising
a frame having a recess on a front surface and a first groove in a first outer circumference, an engagement member engaged in the recess of the frame and having a second groove in a second outer circumference, the second groove communicating with the first groove of the frame, a tension member stretched over the front surface of the frame by inserting a circumference of the tension member into the first and second grooves, wherein an engagement projection is provided on one opposing surface of the recess of the frame and the engagement member, an engagement groove which engages with the engagement projection being formed in the other opposing surface, the engagement projection being prevented from leaving the engagement groove by movement of the engagement member resulting from tension of the tension member, and wherein there is provided an ear for connecting with another member of the chair on an outer circumferential surface of the frame, the recess being formed in the frame closer to the front surface than the ear, the engagement member fitting in the recess.