| 摘要 |
A testing tool for studs and similarly mounted fasteners comprises a cylinder having a base adapted to rest against the surface from which the stud protrudes and a piston axially movable in the cylinder with a hollow piston rod through which an enlarged threaded rod slidably extends, the end of the threaded rod adjacent the base having means to grip a stud when the base of the cylinder is seated against the stud-mounting surface. In one embodiment of the invention, a collar with handles is threadably mounted on the end of the externally threaded rod remote from the base abutting the adjacent end of the piston rod and a hydraulic pressure gauge is attached to the end portion of the cylinder nearest the base so that when the collar is rotated by its handles to apply tension to the stud, it forces the piston downwardly in the cylinder so that the pressure shown on the gauge is proportional to the tension applied to the stud. In another embodiment of the invention, a handgrip-actuated eccentric cam is mounted on the upper end of the stud-gripping rod in place of the collar threadably mounted on the stud-gripping rod for applying tension to the stud and downward pressure on the piston rod.
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