B - Operations – Transporting – 27 – F
Patent
B - Operations, Transporting
27
F
1/30, 1/32
B27F 7/02 (2006.01) B25C 1/04 (2006.01) B27F 7/17 (2006.01)
Patent
CA 2005175
DRIVING TOOL WITH AIR-COOLED BUMPER 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 a 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.
Finlayson & Singlehurst
Illinois Tool Works Inc.
LandOfFree
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