Hydraulic pruning tool

Details Hydraulic pruning tool Hydraulic pruning tool

1993-03-11

1994-08-30

Seidel, Richard K.

Cutlery

Cutting tools

Plural cooperating blades

30249, 91464, B26B 1500

Patent

active

053415728

ABSTRACT:
A hydraulic tool, such as might be used to prune trees, for alternately producing a relatively strong power stroke and a relatively weak reset stroke, which includes a reciprocating member within a housing and a hydraulic system made up of two chambers. The first chamber has an effective projected area relative to the reciprocating member and is hydraulically connected to the outlet. The second chamber has an effective projected area relative to the reciprocating member which is smaller than that of the first chamber. The second chamber is hydraulically connected to the inlet only during the power stroke, and is hydraulically connected to the first chamber only during the reset stroke and during the time between the end of the reset stroke and the beginning of the next power stroke. In this way, during the power stroke the reciprocating member is forced in one direction, so as to activate the pruning head, while during the reset stroke the back pressure of the system is used to urge the reciprocating member in the opposite direction so as to open, or reset, the pruning tool.

REFERENCES:
patent: 2751940 (1956-06-01), Miller
patent: 3476015 (1969-11-01), Ackley
patent: 3854204 (1974-12-01), Gonzales, Jr.
patent: 3922782 (1975-12-01), Lind
patent: 4109381 (1978-08-01), Pellenc

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