Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1989-06-29
1990-09-11
Reese, Randolph A.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
254 29R, 173 53, E21B 900
Patent
active
049557572
ABSTRACT:
An under ground pipe installation apparatus includes a pair of spaced apart, longitudinally directed I-beams and a carriage slidable longitudinally along upper horizontal surfaces of the I-beams. A pair of hydraulic cylinders, one mounted with respect to each beam, reciprocate longitudinally extended rods, the free ends of which are secured to the carriage. A pair of opposed jaw assemblies are mounted pivotally relative to the carriage about respective transverse pivot axes, to enable their movement into and out of a closure position about a longitudinally extended pipe section. A pair of longitudinally extended coil springs, each attached at its rearward end to an associated one of the hydraulic cylinders, have free ends positioned to engage jaw actuator pins parallel to and laterally outward of the pivot axes, once the rearward traveling carriage reaches a predetermined location along the beams. Further rearward movement of the carriage compresses the springs which, in turn, act upon the actuator pins to pivot the jaw assemblies into the closure position, thus preloading the jaw assemblies against and around the pipe section, prior to any forward movement of the carriage. Alternatively, hydraulic cylinders can be employed between the jaw assemblies and carriage, for moving the jaw assemblies into and out of closure.
REFERENCES:
patent: 3022042 (1962-02-01), Orcutt
patent: 3347521 (1967-10-01), Bingham
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patent: 3952384 (1976-04-01), Goldry et al.
patent: 4020641 (1977-05-01), Takada
patent: 4434969 (1984-03-01), Von Ruden
patent: 4455107 (1984-06-01), Schosek
patent: 4502665 (1985-03-01), Yoder
patent: 4765777 (1988-08-01), Gregory
Reese Randolph A.
Ricci John A.
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