Portable manually controlled hydraulic pipe bending apparatus

Details Portable manually controlled hydraulic pipe bending apparatus Portable manually controlled hydraulic pipe bending apparatus

1976-03-31

1977-10-25

Lanham, C.W.

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

7245316, B21D 706

Patent

active

040550699

ABSTRACT:
A pipe bending device is manually operated to pump hydraulic fluid, under the influence of a first reciprocating piston, to extend a second reciprocating piston to bend the pipe. The hydraulic fluid is urged on the pressure stroke of the first piston past a first ball valve and further hydraulic fluid is drawn by the first piston past a second ball valve upon the suction stroke of the first piston. A manually operated lever operates the first piston by swinging movement of the lever through a predetermined angle. A third piston is contacted by that same lever upon further swinging movement of the handle beyond that predetermined angle, in order to open a return passageway for the hydraulic fluid to release the device. The return passageway can be controlled by a third ball valve, or by pins that open both of the first two ball valves.

REFERENCES:
patent: 2254613 (1941-09-01), Matthysse
patent: 2255985 (1941-09-01), Pfauser
patent: 2729063 (1956-01-01), Hoadley
patent: 2867261 (1959-01-01), Traupmann
patent: 3030838 (1962-04-01), Klingler

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