Fastener driving tool with return device for the drive piston

Claim 1

Setting tool which is operable by means of high tension gases, comprising a piston guide (7, 27, 47, 67), a drive piston (21, 41, 61, 81) which is axially transposable in the piston guide (7, 27, 47, 67), including a shaft (8, 28, 48, 68) and a head portion (9, 29, 49, 69), as well as a resetting element which surrounds the shaft (8, 28, 48, 68) and is arranged between a stop (17) of the piston guide (7, 27, 47, 67) which is oriented against the setting direction and the end surface at the setting side, and the resetting element is designed as a shape of plastic material with hollow cylindrical cutouts (12, 32, 34, 52, 72) in such a manner that, as seen in axial longitudinal direction, elastic material and cutouts (12, 32, 34, 52, 72) alternate, characterised in that the cutouts (32, 34) are formed by peripherally designed recesses and, as seen in the longitudinal direction, are alternately arranged at the inside and the outside of the shape (31), and the peripherally designed recesses extended helically.