Boring or penetrating the earth – Boring means including a continuously rotating bit...
Patent
1976-07-14
1978-02-21
Purser, Ernest R.
Boring or penetrating the earth
Boring means including a continuously rotating bit...
175106, 175416, 279 6, 279 16, 299 87, E21C 1304, E21C 114, E02D 1714
Patent
active
040747786
ABSTRACT:
A square hole drill having a cutterhead configuration whose outline is in the form of a Reuleaux triangle and which also has a planetary gear drive. Two counter revolving motions are present in the drill at the same time. One is the pure rotary motion of the drill's cutterhead about its own shaft. The other is the circular motion of the cutterhead as a unit about a center line due to its eccentric mounting and drive. To achieve the opposite rotation of the unit as a whole compared to the rotation of the cutterhead about its own axis, a combined meshing planet gear and ring gear are used. The planet gear is directly connected to the cutterhead by a shaft rigidly attached to the gear's front side. At the rear side of the planet gear is the eccentrically mounted drive shaft. Surrounding the external teeth of the planet gear is a larger stationary ring gear with internal teeth to continuously engage the planet gear's teeth. As these teeth become engaged the planet gear rotates on its own shaft and also rotates, in a larger radius, counter to that direction around the ring gear. In the preferred embodiment the rotation about the planet gear's shaft was one third as fast as the planet gear's rotation around the ring gear. The composite effect of these two counter revolutions when considered with the shape of the cutterhead is that the cutting bits transcribe and cut out a square hole.
REFERENCES:
patent: RE26383 (1968-04-01), Hubek
patent: 1241176 (1917-09-01), Watts
patent: 2586084 (1952-02-01), Powell
patent: 2976027 (1961-03-01), Gallimann
patent: 3036821 (1962-05-01), Letts
patent: 3199496 (1965-08-01), Kell
patent: 3771501 (1973-11-01), DeDobo
patent: 3922120 (1975-11-01), McCullough
Gore Gerald D.
Gunn Jerome A.
Morrell Roger J.
Gardiner Donald A.
Pate III William F.
Purser Ernest R.
The United States of America as represented by the Secretary of
Zack Thomas
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