Tool driving or impacting – Impacting devices – Hammer head comprises plural parts or diverse materials
Patent
1982-03-29
1985-01-29
Bell, Paul A.
Tool driving or impacting
Impacting devices
Hammer head comprises plural parts or diverse materials
173134, 173135, 91299, 91317, B25D 900, E21B 100
Patent
active
044960077
ABSTRACT:
A compressed-air pile-driver, especially for axially insertable tools, including a ram arranged in a housing. The interior of the housing is divided by the ram respectively into an upper compression or expansion chamber and a lower compression or expansion chamber, which can each be alternately connected to a compressed-air source via air connection pipes and a control valve, with each having an air-outlet orifice opened alternately by the ram. In the upper expansion chamber, a pressure chamber, into which the upper air connection pipe of the upper expansion chamber opens, is divided off by an intermediate plate which is approximately parallel to the end face of the ram. Located in the intermediate plate is at least one orifice which connects the pressure chamber to the upper expansion chamber, and which is closed in a leak-proof manner by the ram in its upper dead-center position, the ram additionally being retained firmly in its upper dead-center position by a retaining device. Only when a pressure overcoming the retaining force of the retaining device is built up in the air-inlet orifice is the ram thrown explosively downwards, absorbing high energy in the course of short acceleration paths. The housing of the compressed-air pile-driver is injection-molded from plastic, preferably polycarbonate resins, in order to save weight and cost.
REFERENCES:
patent: 2953117 (1960-09-01), Wandel et al.
patent: 3895680 (1975-07-01), Cook
Bell Paul A.
Ross Taylor J.
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