Implements or apparatus for applying pushing or pulling force – Pipe or rod jack – Tie rod tensioner
Reexamination Certificate
2006-12-12
2006-12-12
Wilson, Lee D. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Pipe or rod jack
Tie rod tensioner
C254S0930HP
Reexamination Certificate
active
07147210
ABSTRACT:
A concrete reinforcement cable tensioning system is variably adjustable to apply different crimping for different sized cables. The system includes a concrete reinforcement cable tensioner having a first actuator for tensioning a cable extending through a concrete structure and a second actuator for crimping a grommet onto the cable. A first hydraulic line is in fluid communication with the first actuator and selectively provides pressurized hydraulic fluid to the first actuator. A second hydraulic line is in fluid communication with the second actuator and selectively provides pressurized hydraulic fluid to the second actuator. A normally closed pilot operated sequencing valve is disposed in the first hydraulic line, and has a pilot line in fluid communication with the second hydraulic line for sensing a pressure in the second hydraulic line, wherein the sequencing valve opens to exhaust hydraulic fluid from the first actuator upon the pressure in the second hydraulic line reaching a predetermined pressure. The predetermined pressure is variably changeable to accommodate different pressures required to crimp grommets on different sizes of cable.
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Arters Edward T.
Foege Carl A.
Pili Roger R.
Actuant Corporation
Quarles & Brady LLP
Wilson Lee D.
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