Patent ID: 7895923
Filing Date: 2011-03-01
Classification: B25B,B25G

Abstract:
1. A wrench comprising: a head portion, a handle portion, and a neck portion between the head portion and the handle portion, with the handle portion being hollow and including a front portion contiguous to the neck portion, a rear portion adapted to be gripped by a user and a necking portion between the front and rear portions, with the front portion having a wall thickness greater than that of the rear portion, and with the necking portion having a wall thickness greater than that of the rear portion and smaller than that of the front portion; wherein the front portion, the necking portion and the rear portion are integrally formed as a single and inseparable component of a same material, with the necking portion including a small gradient section having a rear end contiguous to the rear portion and a front end, with the necking portion further including a larger gradient section having a rear end contiguous to the front end of the small gradient section and a front end contiguous to the front portion of the handle portion, with the small gradient section including an outer periphery having a first tapering gradient from a rear end thereof to a front end thereof, with the larger gradient section including an outer periphery having a second tapering gradient from a rear end thereof to a front end thereof, with the second tapering gradient being greater than the first tapering gradient.