Metal deforming – By relatively receding work-engaging tool-faces
Patent
1982-03-18
1984-10-09
Larson, Lowell A.
Metal deforming
By relatively receding work-engaging tool-faces
72393, 254104, 254124, B21D 314, B21D 4102
Patent
active
044753730
ABSTRACT:
A pipe straightening tool that includes an operating unit that can be inserted forwardly in a pipe as far as needed by use of detachable handle extensions. The unit includes an elongated lower segment and a parallel upper segment thereabove having a nose segment pivoted at its forward end for movement of the forward tapered end of the nose segment toward and away from the tapered forward end of the lower segment. The upper unit is movable toward and away from the lower segment on operation of a pair of connecting toggle linkages having a common actuator. A hydraulic cylinder unit is disposed between and connected to the actuator and another toggle linkage connecting the lower and nose segments so that extension of hydraulic cylinder unit concurrently urges upward movement of both the upper segment and the nose segment. All the segments present outwardly facing surfaces that are conformable to cylindrical surfaces. Boots can be attached to the segments to increase the effectiveness of the tool for larger pipe. A manually operative hydraulic pump contributes substantially to the portability of the tool, such pump being connected to the hydraulic cylinder by a flexible hydraulic fluid line.
REFERENCES:
patent: 1157073 (1915-10-01), Baash
patent: 1407719 (1922-02-01), Boner
patent: 1623405 (1927-04-01), Gocke et al.
patent: 1623657 (1927-04-01), Brown
patent: 2687763 (1954-08-01), Perkins
patent: 2780122 (1957-02-01), McCown
patent: 3710609 (1973-01-01), Jones
patent: 4004444 (1977-01-01), Pollart
patent: 4068825 (1978-01-01), MacPherson
Breidenthal Robert E.
Larson Lowell A.
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