Patent ID: 8181947

Claim:
A spring assembly comprising: a coil spring; and a pair of retainers disposed, respectively, at opposite end portions of the coil spring, wherein the retainers include: a plate member abutting against the end portion of the coil spring and depressed at a central portion thereof toward an inside of the coil spring; and a hook member fixed to the plate member so as to hold a free length of the coil spring shortened, wherein the hook member includes: a pillar portion depending from the plate member and extending into the inside of the coil spring; and a turned-back portion turned back at a distal end of the pillar portion so as to be engaged with an other turned-back portion, wherein a side of the pillar portion tapers inward toward an other side of the pillar portion such that a center of the turned-back portion is offset, in a width direction, from a center of a widest portion of the pillar portion.