Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent
1975-07-07
1977-04-05
Purser, Ernest R.
Tool driving or impacting
Advance causing or controlling means
Motor causes or controls advance
173 38, E21C 500
Patent
active
040156729
ABSTRACT:
Disclosed is a digger attachment for a tractor including a frame having at one end of a frame arm a three-point mount for securing the digger to the tractor. The opposite end of the frame arm supports an auger for pivotal movement about a transverse axis. Attached to the head of the auger is a shaft which extends through a bracket mounted on the frame arm. Coil springs are provided about the shaft on opposite sides of the bracket with the opposite ends of the springs butting against nuts threaded on the shaft. To utilize the digger, the nuts on the opposite ends of the shaft are threaded such that the springs displace the shaft in a manner displacing the auger about its transverse pivotal axis such that its rotational axis is slightly rearwardly inclined relative to a vertical through the auger's pivot. That is, the nuts are respectively threaded and unthreaded to achieve the desired inclination of the auger with the spring forces acting on the shaft in balance. Downward movement of the frame arm thus causes the rotational axis of the auger blade to move toward a true vertical position about its transverse pivotal axis and against the bias of the springs whereby a vertical hole is assured. Upon removal of the auger from the hole, the springs serve to return the auger to its adjusted, slightly rearwardly inclined, position whereby the auger is ready to dig another vertical hole.
REFERENCES:
patent: 1622704 (1927-03-01), Coil
patent: 2410508 (1946-11-01), Lamme
patent: 2461373 (1949-02-01), Cox
patent: 2581535 (1952-01-01), Jackson
patent: 2812162 (1957-11-01), Lay
patent: 2890860 (1959-06-01), Smith
Favreau Richard E.
Purser Ernest R.
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