Abstract: In accordance with the present invention an improved alignment assembly is provided wherein when a threaded fastener is the test specimen, the fastener is gripped by a collet made of two longitudinally split, threaded, and tapered pieces held together with a spring. As a load is applied to the specimen, the two collet pieces are locked together by the tapers, assuring thread alignment. The split collar also preferably has different threads per inch at each end of the collet pieces to adapt to different threads of different specimens. Split collars of different geometry are used to test thin, non-threaded specimens. In a preferred embodiment, a reversible washer in which a first face is used to hold the fastener in place and in alignment in a first test, is also used to test the elongation of the fastener in a separate test, through the use of a second tapered face.

Abstract: In accordance with the present invention, a low in weight, portable, mechanical property testing machine is provided in which no special testing machine foundation is required, and a standard power supply may be used. The applied load to test the specimen is applied by the action of a rod making a single stroke within a cylinder containing hydraulic fluid. The inside diameter of the cylinder is significantly greater than the diameter of the rod. The hydraulic fluid transmitted from the cylinder is substantially ripple free and applies an even load to the specimen being tested through a second fluid cylinder and piston acting therein. The use of valves, as used in the prior art may thus be avoided, thus achieving simplicity of operation. To absorb the shock created by the specimen breaking, a dash pot is provided out board of the second piston as a shock absorber.

Abstract: A power torque wrench tool for applying tension to trusses of the type used in coal mines, consisting of a pair of parallel rods with their adjacent end portions passing through parallel apertures in a truss rod attaching block and threaded at their ends to permit nuts to be attached to their respective ends at opposite ends of the attaching block for holding the truss rods in tensile relationship with each other at a predetermined tension, comprises an elongated body having a notch at one end to receive the rod adjacent to that on which a nut is to be tightened, a nut receiving socket rotatably journaled in the housing, a rotary hydraulic motor with its rotor rotatably journaled in the housing and operatively connected to the wrench to rotate the same, a pair of handles projecting downwardly from the bottom of the housing and an upwardly inclined extension on the side of the housing remote from the alignment notch for reacting engagement with the roof of the mine during operation of the device, the socket ex

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.

Abstract: A camper has a rigid roof structure mountable for travel atop a vehicle, legs pivoted at their upper ends to the roof structure and swingable from horizontal traveling positions along the sides of the roof structure to generally upright positions supporting the roof structure from the ground, the roof structure mounting vertically movable floor structure and collapsible intermediate structure stored in collapsed travel position between said roof and floor structures, and selectively controlled power driven means operatively connecting the floor and roof structures for lowering the floor structure from the roof structure and extending the collapsible intermediate structure to operative condition and raising the floor structure to the roof structure and collapsing the intermediate structure into traveling position.