| 摘要 |
A spring for assisting a tilt adjustment operation can be easily and rapidly attached to a fixed bracket and a movable bracket. Each of two flanges 2 of a fixed bracket A has a tilted flange plate 22 and a locking piece 23. The locking piece has a guiding edge 25, a locking recess 26, an insertion recess 27, and a fixing hole 28. Lateral positions of the locking recess 27 and the fixing hole 8 are substantially matched. In a spring member 7, a first locking shaft portion 75 is formed on the rear side of two coil portions 73, 73, and a second locking shaft portion 76 is formed rearward from the distal end of the first locking shaft portion 75. The first locking shaft portion 75 is engaged with the locking recess 26, and the second locking shaft portion 76 is engaged with the fixing hole 28. The distance between the first locking shaft portions 75 of the spring member 7 is less that the distance between the two guiding edges 25, 25.
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