Testing tool for studs and the like
First Claim
1. A tool for testing fasteners such as studs protruding from a plane surface comprising a cylinder having a pair of end walls each centrally apertured and an extension at one end for engagement with the fastener mounting surface, a piston slidable in the cylinder and having rod portions extending through both end walls of the cylinder, an axial aperture through the piston and piston rods, an elongated tension member extending through the aperture and axially movable therein with both its ends protruding from said piston rod portions, the portion of said tension member protruding from said piston rod in the same direction as the cylinder extension having means for gripping a fastener, a collar surrounding said tension member and adapted to abut against the end of the piston rod remote from the cylinder extension and means for forcing said collar against the adjacent end of the adjacent piston rod, thus applying tension to said tension member and fastener and urging the piston rod and piston axially in the cylinder toward the fastener mounting surface, a hydraulic pressure gauge communicating with the cylinder between the piston and the end wall of the cylinder between the piston and the fastener mounting surface, hydraulic fluid in the same portion of the cylinder whereby tension applied to the fastener by said tension member causes movement of the piston rod and piston toward the fastener mounting surface, thereby causing pressure on the hydraulic fluid readable upon said gauge and indicative of the amount of tension applied to the stud.
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Accused Products
Abstract
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.
11 Citations
17 Claims
- 1. A tool for testing fasteners such as studs protruding from a plane surface comprising a cylinder having a pair of end walls each centrally apertured and an extension at one end for engagement with the fastener mounting surface, a piston slidable in the cylinder and having rod portions extending through both end walls of the cylinder, an axial aperture through the piston and piston rods, an elongated tension member extending through the aperture and axially movable therein with both its ends protruding from said piston rod portions, the portion of said tension member protruding from said piston rod in the same direction as the cylinder extension having means for gripping a fastener, a collar surrounding said tension member and adapted to abut against the end of the piston rod remote from the cylinder extension and means for forcing said collar against the adjacent end of the adjacent piston rod, thus applying tension to said tension member and fastener and urging the piston rod and piston axially in the cylinder toward the fastener mounting surface, a hydraulic pressure gauge communicating with the cylinder between the piston and the end wall of the cylinder between the piston and the fastener mounting surface, hydraulic fluid in the same portion of the cylinder whereby tension applied to the fastener by said tension member causes movement of the piston rod and piston toward the fastener mounting surface, thereby causing pressure on the hydraulic fluid readable upon said gauge and indicative of the amount of tension applied to the stud.
Specification