Apparatus for applying an impact force

Details Apparatus for applying an impact force Apparatus for applying an impact force

1976-02-06

1978-08-15

Hafer, Robert

Tool driving or impacting

Processes

173 49, 173122, E02D 718

Patent

active

041065697

ABSTRACT:
A pile driver in which a weight is reciprocated in a frame along a vertical path. The weight is suddenly retarded just before the weight reaches its lowermost position and the resulting high force is transmitted to the pile without an impact occurring. In one embodiment, the weight is connected to the frame by two pivotal links and these links are used to retard the weight. In another embodiment, the weight is driven upwardly and retarded by a cam mounted on a drive shaft.

REFERENCES:
patent: 58880 (1866-10-01), Noyes
patent: 2475614 (1949-07-01), Hoppmann et al.
patent: 2660880 (1953-12-01), Vivian
patent: 2937865 (1960-05-01), Patterson
patent: 3946598 (1976-03-01), Towne et al.

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