Chicago Pneumatic Tool Company

Lord Corporation

Paul J Bilodeau

Robert J Michael

John D Clay

Lester A Amtsberg

A vibration-reduced impact tool is disclosed wherein an elastomeric vibration isolator is fixedly attached within the tool housing and functions to absorb the vibration typically transmitted from the handle to the operator. The isolator is mounted between the cylinder assembly and the handle. As the tool is operated, a piston within the cylinder assembly is driven forward where it impacts with a tool accessory. The impact causes the piston and cylinder assembly to slide rearward in the tool housing, toward the handle. The elastomeric isolator absorbs the rearward movement of the cylinder assembly and thereby eliminates much of the vibration normally transmitted from the cylinder assembly to the handle and in turn, to the operator.

Vibration-reduced impact tool and vibration isolator therefor

A safety throttle is provided for a hand held pneumatic tool in which a pivotable intermediate member must be manually moved, by a prior secondary movement, into a slotted throttle lever before the later primary movement of the throttle lever will allow the intermediate member to activate a throttle valve to actuate the pneumatic tool.

Safety throttle

A rock drill having a hydraulic pressure reservoir formed by the drill housing, and an anvil rotation mechanism enclosed in the housing. A piston of substantial length and a mechanical hydro-operated valve means, provide favorable pulse duration and low impact velocity. The piston has only two sliding seal diameters which permits simplified valve and cylinder configuration. The friction surfaces of the fronthead drill assembly are lubricated and cooled by integration with the circulating hydraulic system. A floating seal cartridge between the piston and anvil, tends to rotate the piston with the anvil to minimize rotative scrubbing at impact.

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Frankfort, NY, United States of America

Paul J Bilodeau