Abstract: For use with a turntable structure for rotating a sound-recorded disc, an elongated tone arm is mounted pivotally intermediate its ends by a gimbal structure in which concentric rings are pivoted at right angles to each other by means of resilient torsion members which allow the tone arm to pivot, substantially without friction, both horizontally and vertically. The outer end of the arm mounts a cartridge stylus and the inner end mounts a longitudinally adjustable counterbalancing weight. Cooperating magnets are mounted on the tone arm and turntable base and are arranged to provide repelling magnetic forces to effect insertion of the stylus in the starting groove of a recorded disc and to effect removal of the stylus from the ending groove of the disc and return of the tone arm to a rest position. Energy absorbing material is contained on the tone arm to prevent the latter from resonating.

Abstract: Front and rear couplers are adapted for attachment to a telescope sight each by means of a thin, flexible steel strap which is drawn tightly about the sight by means of opposed strap tensioning cam screws mounted in the sides of the coupler. The front coupler includes a fixed latch component arranged for releasably engaging a forward projection on a front base member, with a centering projection on the front coupler being received in a complementary centering recess in the front base, the front base being adapted for attachment to the receiver of a rifle. The rear coupler includes a pair of longitudinally movable, laterally spaced, spring loaded latch rods, the rearward ends of which are interconnected by a transverse latch bar arranged to retractably engage under a shoulder on the rearward end of a rear base member which is adapted to be secured to the rifle receiver. The rear coupler has a centering projection for reception in a complementary centering recess in the rear base.

Abstract: A tubular loop forming tool for sewing machines replaces the normal presser foot attached to the sewing machine presser bar, thereby providing the function of the presser foot and also serving as a gauge to control the size of a tubular loop being sewn from fabric material, the gauge preferably being adjustable so various size tubular loops may be formed.

Abstract: An exerciser device comprises an elastic compression body which is configured to accommodate a wide variety of exercises for different muscle groups and enclosed within the body is a flexible reservoir of liquid communicating with a transparent gauge tube disposed at the surface of the body for viewing the liquid level therein by the person using the exerciser. The end of the gauge tube opposite the reservoir communicates with an air compression chamber in which compressed air resiliently opposes movement of the liquid in the gauge tube in response to compression of the elastic body.

Abstract: A pair of batteries of equal voltage rating are connected together in parallel through isolation diodes and in series through a first silicon controlled rectifier, the gate electrode of which is connected to the positive terminal of the first battery through a second silicon controlled rectifier and the emitter-collector switch circuit of a switching transistor. The gate electrode of the second silicon controlled rectifier is connected to said positive terminal through a capacitor and said transistor switch.

Abstract: A housing of non-magnetic material and provided with a coin slot therethrough also contains a rejector finger which is positioned normally adjacent the coin slot but which is movable by an associated magnet to intercept the coin slot when a magnetic coin or other magnetic slug, i.e., a coin or slug which includes a metal having magnetic susceptibility, is inserted in the coin slot.

Abstract: Motion picture sound film is spliced by cutting the film transversely between the adjacent picture frames, then longitudinally forward between the picture frames and sound stripe to the end point at which the sound relates to the first picture frame adjacent the transverse cut, and then transversely across the sound stripe at said end point. A similar cutting is made at the opposite end of a length of the film to be removed, whereby to provide a pair of mating ends on film portions to be joined. These mating ends are arranged with their mating edges in abutment, the forwardly extended sound stripe of the first cutting fitting into the notch formed by the removal of sound stripe in the second cutting, and the picture frames adjacent the transverse cut being in edge-to-edge abutment. Pressure sensitive transparent tape then is applied across the abutting transverse and longitudinal edges to secure the splice.

Abstract: A coupling for joining sections of tubular pipe together end to end into a continuous length includes a tubular connector having an outside diameter substantially equal to the inside diameter of the pipe and having a protruding annular shoulder of arcuate cross section located intermediate its ends. The adjacent ends of the pipes are placed over opposite ends of the connector and pressed together, flaring their terminal portions outwardly where they abut, substantially coplanar with the diametric center of the shoulder, frictionally joining both sections of pipe to the connector. A metallic colored, silicone sealant is coated over the confronting raw ends of the pipes to provide a low maintenance seal which protects the joint from deterioration.

Abstract: A plurality of elongated slats are woven through the links of a chain link fence, in spaced parallel arrangement, and are engaged at one of their ends in an elongated channel-shaped retainer member woven through the links at an angle to the parallel slats. The ends of the slats opposite the retainer member preferably engage an elongated abutment member which may be another retainer member, or another slat, woven through the links parallel to the first named retainer member.

Abstract: A travel trailer with a vertically foreshortened forward section, which is configured for extending over a towing vehicle for fifth wheel connection therewith, has folding side walls and front wall which open to extend the front section downward, providing full height throughout the trailer. The floor of the forward section is movable vertically between a raised position above the folded side walls and front wall for transportation of the trailer and a lowered position adjacent to the lower margins of the side walls and front wall when they are in their unfolded living positions. Winches and cables are arranged for separately raising and lowering the side walls, the front wall and the floor.

Abstract: A ball is delivered into the constricted space between, and thereby gripped frictionally by, a fixed pad and a confronting surface of a wheel which is driven at a speed predetermined to propel the ball therefrom at a selected velocity. The line on which the ball is propelled between the pad and wheel is adjustable about a horizontal axis and the speed of the wheel is variable so as to adjust the trajectory of the thrown ball. Further, the pad may be mounted above or below the wheel to reverse the spin on the ball and thus afford a variety of practice conditions.

Abstract: A wheelchair includes a main frame supported on front and rear pairs of wheels, the main frame pivotally mounting pivotally interconnected back rest, seat and leg rest frame segments in such manner as to allow said segments to be adjusted between positions supporting a patient in upright sitting position and in fully reclining position, without the necessity of first removing or otherwise requiring physical participation of the patient.

Abstract: A tool for spacing decorative furniture nails comprises an elongated handle arranged for grasping by a user, joined angularly at one end to a planar gripping body which is configured for placement in overlying engagement with the edge of a piece of upholstery material to be nailed to a furniture frame. The gripping body has a substantially straight working edge, and a plurality of nail receiving openings are located at evenly spaced intervals in the gripping body a short distance inwardly from the working edge for frictionally engaging the shanks of nails. Flared slots, which extend from each opening outwardly to the working edge, are configured for communicating with the openings over slightly less than 180.degree. of their periphery for capturing the shank of a nail in an opening and permitting its release upon pivoting of the body about an already set nail.

Abstract: The transmission of amplitude modulated stereo is achieved by modulating the positive and negative half cycles of a radio frequency carrier separately with a different one of the channels carrying the audio intelligence of a stereo program, thereby transmitting both stereo channels on the same carrier. The modulation is done after final amplification of the carrier signal, directly in the antenna circuit, in order to eliminate mixing of the two channels, and is achieved by utilizing each half cycle of radio frequency antenna current to activate separate modulators each connected to a different one of the sources of audio frequency intelligence signals. Reception of this transmission is achieved by inserting a radio frequency diode in the resonant circuit of each of two receiving antennas in opposite directions, whereby each antenna circuit is responsive only to a different one of the two channels.

Abstract: Mechanism operating through a mechanical advantage for rolling over a two-way gang plow comprises a pair of hydraulic cylinders acting through respective short links connected pivotally at one of their ends to their associated cylinders and at their opposite ends pivotally to spaced pivots on a bell crank lever secured to the roll-over shaft of the plow, the spacing between the bell crank lever pivots being less than the spacing between the link pivots. Annular rings surround the roll-over shaft for abutment by the links during operation of the mechanism, providing each link with a fulcrum point which is arranged to augment the output of the associated hydraulic cylinder during the initial portion of its extension.

Abstract: Refractory, hard carbide alloys, intended primarily as replacement for the cast eutectic WC + W.sub.2 C tungsten carbides currently used as hard components in wear-resistant facings, consist of fine-grained and hard two-phase mixtures of subcarbide, (Mo,W).sub.2 C, and hexagonal monocarbide (Mo,W)C, solid solutions, and are formed by solid state decomposition of the pseudocubic, .eta.-(Mo,W).sub.3 C.sub.2, or cubic .alpha.-(Mo,W)C.sub.1-x solid solutions. The carbide alloys of the invention can be combined with low-melting metal binders to form cemented carbide alloys of at least equivalent wear-resistance to alloys using the eutectic tungsten carbides.

Abstract: An archery bow includes a pair of bow limbs projecting from opposite ends of a handle member, each eccentrically mounting pivotal cam members at its outer extremity. Each cam member comprises a larger diameter cylindrical cam element and a smaller diameter cylindrical cam element eccentrically joined together and having a common pivot axis which is eccentric with respect to both cam elements. A bow string for projecting an arrow comprises a working stretch and a pair of separate end segments, one detachably connected to each end of the working stretch. Each end segment extends from the working stretch and is wrapped partially around its associated larger diameter cam element, then passes through a diametric bore in the cam member to the opposite side of the smaller diameter cam element, wrapping further around the smaller diameter cam element, and extending therefrom to a connection with the opposite bow limb.

Abstract: A pair of laterally spaced plow discs are supported by a framework which is mounted resiliently adjacent each pair of support wheels of a center pivot irrigation system in position to engage the laterally spaced mounds of earth produced as the wheels form a depressed annular track in the soil during rotation of the irrigation system, the plow discs being disposed adjustably to direct the mounded earth back into the track and thereby level the ground.

Abstract: An elongated bar is mounted on a trailer tongue for longitudinal sliding and lateral pivoting movement relative thereto, the forward end of the bar providing releasable engagement with a trailer hitch ball component on a tow vehicle. In one embodiment the forward end of the bar has a centering notch arranged to engage the stem of the hitch ball, the bar underlying the companion hitch socket component on the trailer tongue. In another embodiment the forward end of the bar is provided with the socket component of a trailer hitch for engagement with the companion ball component on a tow vehicle. The rearward end of the bar is connected to a pair of restraining chains or rods which are connected to laterally spaced terminals on the tongue, such that the chains or rods limit the rearward, forward and lateral movement of the bar.