Backrest device
A backrest and backrest technology, applied in transportation and packaging, special positions of vehicles, chairs, etc., can solve problems such as the weakening of the sliding plate and ratchet meshing state
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[0028] Embodiments of the present invention are described below with reference to the drawings. Figure 1 ~ Figure 3 It shows the first example of the backrest device according to the present invention. The backrest device is composed of a first connecting arm 11 , a second connecting arm 12 , a pair of sliding plates 13 , an operating cam 14 , a pair of rollers 15 , a coil spring 16 , a hinge shaft 17 and an operating rod 18 .
[0029] The first connecting arm 11 and the second connecting arm 12 accommodate two sliding plates 13, the action cam 14 and the two rollers 15 in a state overlapping with each other, and are in a supported state rotatably around the hinge shaft 17. The first connecting arm 11 is fixed on the side rear of the chair seat side not shown among the figure, and the 2nd connecting arm is fixed on the side below of the chair back side not drawn among the figure.
[0030] In this way, the backrest device connects the back of the chair to the rear end of the ...
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