A sinuous spring or S-spring 10 used in the present invention has left and right end portions 10a and 10b which include two curved regions 10aU and 10bU, respectively. A seat back frame 7 includes left and right cylindrical side frame portions 9L and 9R. One spring mounting portion 11 for allowing the left end portion 10a of the S-spring 10 to be mounted thereto is formed in an outwardly-facing lateral surface area of the left cylindrical side frame portion 9L, whereas the other spring mounting portion 11 for allowing the right end portion 10b of the S-spring 10 to be mounted thereto is formed in an outwardly-facing lateral surface area of the right cylindrical side frame portion 9R. Those two spring mounting portions 11 may be embodied by first and second hole portions 11A-1 and 11A-2, respectively, for example, in which case, two distal ends 10aE and 10bE of the S-spring 10 may be inserted and hookingly secured in the first and second hole portions 11A-1 and 11A-2, respectively, such that the two curved regions 10aU and 10bU of the S-spring 10 are closely contacted on and along two outer circumferential surfaces of the left and right cylindrical side frame portions 9L and 9R, respectively.
SPRING MOUNTING STRUCTURE IN SEAT BACK
2018-07-19
Patent
Electronic Resource
English
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