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US 5,396,967 AGranted
Post hole digger
OwnerTerence J. Stewartinventor
Life of this patent
Estimating the term…
Abstract
A post hole digger comprising a borer, an hydraulic driving motor for reversibly driving the borer and a frame on which the borer is mounted is described. This post hole digger has the advantage of being able to be disengaged from a hole being bored if the borer should become stuck. In addition, torque reaction from the borer striking obstructions is absorbed by the hydraulic relief valve. The borer and hydraulic motor are at opposite ends of the frame which has a fulcrum in between to allow the weight of one to counterbalance the weight of the other for ease of operation.
Claims9
A stand alone portable post hold digger comprising in combination:
- i) a boring implement;
- ii) a pivotal elongate frame on which the boring implement is pivotally mounted proximate one end, the frame being adapted to lower the boring implement into contact with the ground and counterbalanced to assist in raising and lowering the boring implement;
- and
- iii) hydraulic driving means, the driving means being adapted to drive the boring implement in a first direction to bore a post hole, and in the opposite direction to extract the boring implement from the hole.
1 more element
Dependencies are inferred from the claim text.