Driving tool with air-cooled bumper

Details Driving tool with air-cooled bumper Driving tool with air-cooled bumper

1988-12-16

1990-06-12

Yost, Frank T.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

227130, 227156, B23B 4516

Patent

active

049324802

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.

REFERENCES:
patent: Re32452 (1987-07-01), Nikolich
patent: 3496840 (1970-02-01), Wandel et al.
patent: 3552274 (1971-01-01), Bojan et al.
patent: 3815475 (1974-06-01), Howard et al.
patent: 3817091 (1974-06-01), Frederick
patent: 3969989 (1976-07-01), Maurer et al.
patent: 4206687 (1980-06-01), Klaus et al.
patent: 4401251 (1983-08-01), Nikolich
patent: 4441644 (1984-04-01), Farian
patent: 4475680 (1984-10-01), Farian
patent: 4509669 (1985-04-01), Elliesen

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