Patent ID: 9545710
Date: 2017-01-17
CPC Classifications: B25D

Claim:
1. An impact tool for providing a measured impact force to a surface, the tool comprising: a first spring for providing the measured impact to the surface; a body having a narrow neck at an internal medial position, a first cavity on one side of the narrow neck for receiving the first spring therein, a second cavity on an opposed side of the narrow neck; a cover threadably securable to the body for presetting an initial preload of the first spring to increase or decrease the measured impact to the surface; a slug slidably disposed within the first cavity with the first spring disposed between the slug and the cover, a distal end of the slug having a conical surface which is about 20 degrees from a transverse plane to a central axis of the slug; a second spring disposed within the second cavity, the second spring being skewed from a longitudinal axis about 30 degrees to about 45 degrees from the longitudinal axis of the second spring; a trip release member with the second spring disposed around the trip release member wherein the skewed second spring biases the proximal end of the trip release member to a side of the narrow neck of the body, a distal end of the trip release member having a convex surface; a hammer slideable with respect to the body, a proximal end of the hammer having a concave surface configured to mate with the convex surface of the trip release member, the concave surface being larger than the convex surface, the convex surface and the concave surface being defined by a radius R so that the entire convex surface remains in contact with the concave surface when measured impact to the surface is transferred to the hammer; a nose engaged to a distal end of the body with the second spring disposed between the narrow neck of the body and the nose, the hammer being slidably disposed within a distal aperture of the nose, the distal aperture having a non-circular shape and an external configuration of the hammer matching the non-circular shape of the distal aperture to prevent rotary movement of the hammer about its longitudinal central axis; a head attached to the hammer, the head having a non-symmetrical configuration about a longitudinal axis of the head, the longitudinal axis being aligned to a direction of travel of the head when attached to the hammer and the tool is operated.