Cutting – By tool inside hollow work
Patent
1978-04-18
1980-02-26
Yost, Frank T.
Cutting
By tool inside hollow work
83554, 83607, 83617, 83639, 83642, B26D 130, B26D 512
Patent
active
041899660
ABSTRACT:
The specification discloses a hydraulic pressure operated hand tool of the type in which the manual pressure exerted on a small-area pump piston creates a hydraulic pressure which is communicated to a power cylinder for activating a hand tool jaw member, such as a cutter blade. Preliminary take-up movement of the cutter blade into contact with the object to be severed, such as cables, pipe etc., is effected by manual pressure applied to a second pump piston of relatively large area, which causes rapid displacement of the hydraulic medium from a reservoir to the power cylinder before exertion of manual pressure to the small-area pump piston. A release valve provides instant return displacement of hydraulic medium via a by-pass communication from the cylinder to the reservoir to relieve the activating pressure on the cutter blade and restore it promptly to normal position. Interchangeable cutters are provided.
REFERENCES:
patent: 1588200 (1926-06-01), Skelton
patent: 2783840 (1957-03-01), Snorek
patent: 3140634 (1964-07-01), McDaniel, Jr.
patent: 3587372 (1971-06-01), Prew
patent: 3788173 (1974-01-01), Keigley
patent: 4088048 (1978-05-01), Olsson
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