Patent ID: 7766312

Claim:
A coil spring, comprising: an element wire that is coiled and which is receivable between a movable part and a stationary part, said element wire having a first end and a second end, said first end being engageable with the movable part and continuous to a first turn of the element wire, said first end having a pitch angle smaller than a corresponding pitch angle of the first turn of the element wire so as to gradually narrow a gap between said first end and the first turn in an axial direction of the coil spring; said first end of the element wire being shifted in one of diametral inner direction or a diametral outer direction of the element wire relative to the first turn and having a portion that axially overlaps with the first turn and continuously extends from a base end portion starting to shift to a tip end portion of said first end, to secure a gap for shot peening between the first end and the first turn when the coil spring is in a free state without load.