Automatic drop hammer system

Details Automatic drop hammer system Automatic drop hammer system

1989-08-04

1990-12-18

Yost, Frank T.

Tool driving or impacting

Means to control advance and cyclically reciprocate a...

173 87, 405232, B25D 900

Patent

active

049779656

ABSTRACT:
Disclosed is a device for automatically and continuously lifting and dropping a drop hammer. The device has hydraulic and mechanical components which lift and drop the hammer and electromechanical components which sequence various actions and ensure that the hammer is always dropped from a preset height above its last dropped position. This is useful for soil testing in accordance with America Society for Testing and Materials Test D 1586 "Standard Method for Penetration Test and Split Barrel Sampling of Soils" and other tests.

REFERENCES:
patent: 3216511 (1965-11-01), Ladd et al.
patent: 4150727 (1979-04-01), Shepherd
patent: 4660655 (1987-04-01), Wilner

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