Importance

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Abstract

A driving tool comprising a cylinder, a piston movable axially within the cylinder, a driving element movable conjointly with the piston so as to move through a central aperture of an end wall of the cylinder in a driving stroke and in a return stroke, and a bumper, which arrests movement of the piston toward the end wall of the cylinder in a driving stroke. The bumper is made of resilient material, such as cast polyurethane, in an annular shape. The bumper has a plurality of slots extending radially from each of its inner and outer peripheral surfaces and extending axially between its opposite ends. Each of a plurality of ports in a wall of the cylinder, either the end wall or a cylindrical wall, communicates with a space between the piston and the end wall and with one of the slots to cause air to pass through the communicating slots before being exhausted through the ports in a driving stroke and after being admitted through the ports in a return stroke. Air passing through the communicating slots helps to cool the bumper.

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First Claim