Implements or apparatus for applying pushing or pulling force – Pipe or rod jack – Tie rod tensioner
Patent
1985-02-11
1986-07-08
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Pipe or rod jack
Tie rod tensioner
92 5R, E21B 1900
Patent
active
045988978
ABSTRACT:
An hydraulic tensioning tool for tensioning reinforcing cables, rods or like devices in concrete structure. A first working piston-cylinder device (21) is arranged to effect the actual work of tensioning the cable, while a second working piston-cylinder device (22) causes the cable to be anchored to a cable lock (12). The first device (21) includes a tensioning cylinder (23) and a tensioning piston (24) having mounted on the outer free end (25) thereof a readily removed cable holder (14). The tensioning cylinder (23) of the first piston-cylinder device and the locking cylinder (27) of the second piston-cylinder device (22) are accommodated in a common cylinder housing (11), although separated by a partition (29) which forms the bottoms of respective cylinders, such that the tensioning piston (24) and the locking piston (26) for the cable lock (12) are movable in mutually opposite directions during their respective working strokes. An electromagnetic position indicator (16) is arranged between the cylinder housing and the cable holder for measuring the extent of movement therebetween and for stopping said movement when a given magnitude has been reached.
REFERENCES:
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patent: 3654549 (1972-04-01), Maurer et al.
patent: 3692277 (1972-09-01), Schwartz et al.
patent: 3956973 (1976-05-01), Pomplas
patent: 4471304 (1984-09-01), Wolf
Aktiebolaget Bygg -och Transportekonomi (BT) Div. Nike Hydraulic
Watson Robert C.
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