Patent ID: 6668942
Filing Date: 2003-12-30
Classification: B25D

Abstract:
A damping apparatus mounted in a reciprocating pneumatic tool having a cylinder with a front opening, a rear end and a channel defined through the rear end and communicating with the front opening and a gun-shaped body, the front opening of the cylinder adapted to hold a tool head and a piston movably mounted in the channel, and the damping apparatus comprising:a damper adapted to attach to the rear end of the cylinder and the damper having a front opening adapted to be attached to the rear end of the cylinder, a rear end adapted to mount in the gun-shaped body of the reciprocating pneumatic tool, an outer periphery, a damping segment with a cross section formed between the front opening and the rear end of the damper, a spiral slot defined longitudinally through the rear end of the damper, multiple first slots defined transversely in the damping segment and parallel to each other and each first slot communicating with the spiral slot, and multiple longitudinal holes defined in the damping segment through the front opening of the damper and communicating with the spiral slot and one of the adjacent first slots, and a protector mounted around the damper and adapted to partly mounted in the gun-shaped body around the cylinder, and the protector having a hexagonal front end, a rear opening facing the damper, an outer surface, an inner surface with a shoulder, multiple exhaust holes radially defined in the hexagonal front end of the protector, multiple supply ports defined in the protector near the rear opening of the protector, and a central hole defined axially through the hexagonal front end of the protector and adapted for the cylinder passing through the central hole.