TAPE RULE BLADE HOOK SHOCK ABSORBER

摘要

A power recoilable rule has an improved bumper (60) for cushioning the recoil impact of the blade hook (20) when the blade (16) is refracted into the casing (12). The casing (12) has an opening (38) at a juncture between the bottom wall (32) and front wall (34), and a bumper (60) is mounted in the casing (12) within the opening for linear sliding movement relative to the casing in a path along the bottom wall (32). The opening (38) in the front wall (34) and the outer end of the bumper cooperate to provide an exit aperture for the elongated blade (16) which extends outwardly through the exit aperture (41) and has a hook (20) on its outer end. A shock absorbing compression spring (68) acts between the inner end of the bumper and the housing, and it is compressed by the inward movement of the bumper to absorb energy imparted by the hook when it impacts the bumper.