Mechanic device for the automatic control, at two speeds, of win

Details Mechanic device for the automatic control, at two speeds, of win Mechanic device for the automatic control, at two speeds, of win

1977-11-14

1979-06-12

Hafer, Robert A.

Tool driving or impacting

Means to control advance and cyclically reciprocate a...

B25D 900

Patent

active

041577370

ABSTRACT:
A mechanic device that can be applied to pile-drivers, as to render automatic the control of the winch to lift the probe-weight of said machines, and allowing, at the same time, to perform the work at two different percussion speeds.

REFERENCES:
patent: 2082865 (1937-06-01), Wigness et al.
patent: 3351047 (1967-11-01), Barker
patent: 3842916 (1974-10-01), Watanabe
patent: 3938595 (1976-02-01), Swenson

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