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US 4,038,763 AGranted
Orbital trench forming apparatus
OwnerMarion Edward Hutchisoninventor
Life of this patent
Estimating the term…
Abstract
A trenching apparatus of a type for use particularly in hard or discontinuous soils. First and second triangular members, having digging teeth connected to the leading edges thereof, are connected to the housing by three crank assemblies. One of the crank assemblies is coupled to the motor for turning the crank and thereby oscillating the first and second members. One of the crank assemblies is a timing crank for establishing the proper relative movement between the first and second members so that the orbital motion of the first and second members are 180.degree. out of phase.
Claims19
A trenching apparatus comprising:
- a housing;
- means for connecting said housing to a prime mover;
- a first crank assembly rotatably mounted to said housing about a first axis, said first crank assembly having a first circular portion and a second circular portion, the axes of said first and second circular portions being different than said first axis and different from each other;
- a second crank assembly rotatably mounted to said housing about a second axis, said second crank assembly including a third and a fourth circular portion, the axes of said third and fourth circular portions being different than said second axis and different from each other;
- a timing crank assembly rotatably mounted about a third axis, said timing crank assembly including a fifth and a sixth circular portion, the axes of said fifth and sixth circular portions being different than said third axis and different from each other;
- a first member having first, second and third circular openings therein and said first, third, and fifth circular portions being rotatably received respectively therein;
- a second member having fourth, fifth and sixth circular openings therein and said second, fourth and sixth circular portions being rotatably received respectively therein;
- a first set of teeth connected to a leading edge of said first member;
- a second set of teeth connected to a leading edge of said second member;
- and
- means connected to said housing for rotating said first crank assembly about said first axis, and thereby rotating said first and second members.
8 more elements
Dependencies are inferred from the claim text.