E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
61/90
E02D 7/10 (2006.01) B25D 9/08 (2006.01)
Patent
CA 1186904
-1- Abstract Compressed-air pile-driver The invention relates to a compressed-air pile- driver, especially for axially insertable tools, which consists of a ram 20 located in a housing 8. The housing interior is divided by the ram 20 respectively into an upper compression or expansion chamber 21 and a lower compression or expansion chamber 22 which can each be connected alternately to a compressed-air source via air connection pipes 19, 30 and a control valve 83 and which each have an air-outlet-orifice 27 opened alter- nately by the ram 20. In the upper expansion chamber 21, a pressure chamber 18, into which the upper air connection pipe 19 opens, is divided off by an intermed- iate plate 5 approximately parallel to the end face 80 of the ram 20. Located in the intermediate plate 5 is at least one orifice 38 which connects the pressure cham- ber 18 to the expansion chamber 21 and which is closed in a leak-proof manner by the ram 20 in its upper dead- center position, the ram 20 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 38 is the ram 20 thrown explosively downwards, absorbing high energy in the course of short acceleration paths. The housing 8 of the compressed-air pile- driver is injection-moulded from plastic, preferably polycarbonate, in order to save weight and cost.
399475
Fetherstonhaugh & Co.
Zinck Eugen
LandOfFree
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