Abstract: Cooling apparatus for the stern drive unit of a marine inboard-outboard drive system, the cooling apparatus being of the kind making use of the ram effect and having an intake tube carried on the stern drive unit with its intake end in the water. The tube has an intake port held below the water surface for accepting water by the ram effect while the boat is moving forward. The water is carried by the tube to a system for delivering water from the intake tube to the stern drive unit for cooling it. According to the invention the bottom of the intake tube is closed and the intake port is formed closely adjacent to the bottom of the tube in a selected part of its wall facing forwardly when the boat is in forward motion.

Abstract: A log splitter of the kind having a hydraulic ram for driving a log into a confronting wedge for splitting it, the ram and the wedge being mounted on opposite respective ends of a supporting rail. This splitter includes a hydraulically powered drag hoist carried on the rail and controllable separately from and independently of the ram. The hoist carries a relatively long lifeline making it capable of dragging logs from a substantial distance to the rail, as well as lifting the logs up to the wedge. The rail is mounted on retractable wheels making it roadworthy and also adjustable in height to fit the convenience of the operator, the wheels being lockable in position intermediate between their fully lowered and their fully raised positions.

Abstract: A cable guard includes a rod to be fixed to the handle of a compound bow extending from the handle toward the bowstring and positioned laterally offset from the central plane of the bow to keep the tension cables out of the path of an arrow fired by the bow. A tube fits slidably on the rod and carries a pair of pulleys at its distal end, coaxial with the rod and the tube. The first pulley is fixed to the tube, and the second pulley is freely rotatable on the tube. The tension cables are trained respectively into the grooves of the two pulleys on the side of the pulleys opposite from the central plane of the bow. As the bow is drawn the first cable turns its pulley together with the tube in one direction, while the second cable turns its pulley in the opposite direction. Simultaneously, the cables work together to draw the tube axially along the rod away from the handle.

Abstract: A practice target for the bowfisher made of a waterproof, relatively rigid, expanded, closed cell foamed plastic material such as polyethylene or polyurethane, colored to resemble a finny fish, and an anchor arrangement to hold the target submerged at a preselected depth below the surface of the water.

Abstract: The sighting device may include a reticle and a strongly magnifying lens or lens segment positioned along the line of slight. The lens, or segment blocks out a part of the object field and focusses an image of the reticle on the user's retina. Alternatively, a holographic image of the reticle may be used in place of the reticle-lens combination. The device may also include a Galilean telescope with the magnifying lens segment positioned at the eyelens and the reticle adjacent to the objective.

Abstract: A trigger arrangement for a fire protection system of the kind in which a fire extinguisher is triggered by the relaxation of tension in a wire that is trained through a region to be protected and kept under tension. A fusible link forces a portion of the wire to lie along a curved path. When the fuse part of the link melts, the link releases the wire, allowing it to straighten out, thus increasing its overall length, relaxing the tension and triggering the extinguisher The link of the invention is simply an integral, laminated body in which the laminations, held together by an adhesive, fusible material, are formed with wire guide means for restraining the wire in a looped configuration so long as the laminations are held together.

Abstract: A stove for burning corn (maize) including a heat exchanger having an input chamber in which corn is burned, and an output chamber where heat from the burning corn is absorbed in air, which is directed to a conventional grain drying machine for drying the grain therein. Unique arrangements are made for optimizing the quantity of air admitted to the input chamber for combustion, and for making the flow of combustion air uniform across the entire mass of burning corn. An auger is included for feeding corn to the input chamber either from a separate supply vessel, or, in cases where corn is the grain to be dried, from the grain dryer itself.

Abstract: A modular construction for compound archery bows includes sets of spacer blocks for insertion between the bow handle and the limbs. The blocks are shaped to provide selected variations in the geometry of the bows, selectively adjusting the brace height and the overall length of the bow. The manufacturer is enabled to create bows of many different characteristics without investing in dies to produce differently shaped handles, needing only differently shaped spacer blocks.

Abstract: In a compound bow a pin is carried at one end of the tension cable and fitted through an axial hole in the eccentric wheel at the end of the flexible limb. A peripheral groove is formed in the pin at its end opposite from the cable, and the bowstring is looped around the pin, lying in the groove. The cable lies on one side of the wheel and the bowstring on the opposite side so that the pin is trapped in the hole in the wheel and no additional parts are required for retaining the pin in the wheel.

Abstract: An actuator circuit for an inductive load includes a first low impedence source of direct current at a relatively high voltage, a second low impedance source at a lower voltage, a switching arrangement responsive to an input signal for connecting a load across the first source at the beginning of the signal and for a predetermined initiating interval thereafter, and at the end of the interval switching the load from the first to the second source, and a feedback control for limiting the current through the load to a first, constant value during the initiating interval and to second, lower constant value thereafter. The circuit cuts off the load when the input signal ceases or it removed.

Abstract: A position detector for generating output signals indicative of changes in the position of a cyclically moving object such as the pointer on a selected dial of a meter comprising a snap action toggle mechanism, drive means responsive to motion of the moving object for operating the toggle through one complete cycle for each cycle of motion of the object, and a photo coupler device for sensing the instantaneous position of the toggle. The coupler is positioned as a stop for the toggle at one limit of its travel, and the toggle reflects light from the coupler back to the coupler when it is at its other, opposite, limit position. When the toggle is at the one limit it covers the emitting and receiving faces of the coupler, thereby positively inhibiting it so that it cannot produce a positive output signal.

Abstract: A battery operated, portable actuator for an inductive load such as an electromagnetically actuatable photographic shutter includes an initiating capacitor for initiating acutation of the load, and a continuing holding circuit portion for continuing energizing the load after discharge of the initiating capacitor. The capacitor is connected to be charged by the output of a voltage multiplying rectifier which is alternately turned ON and OFF according to the instantaneous voltage across the capacitor, being turned ON when the voltage is low, and OFF when the voltage is high. The continuing circuit portion is arranged to feed time-spaced current pulses to the load, and a diode is connected across the load so that its own inductive nature holds it energized during the intervals between the pulses. The duration of the energizing current pulses is increased in response to fall-off of the battery output voltage.

Abstract: A magnetically driven and latched actuator includes an armature, at least a part of which is of a ferromagnetic material, mounted for reciprocating travel between two spaced apart limit positions. An electrical coil is operative upon the ferromagnetic material to drive the armature alternately back and forth between the limit positions, and a pair of auxiliary ferromagnetic bodies are fixed, each adjacent to a respective one of the limit positions. The auxiliary bodies and the ferromagnetic portion of the armature are mutually magnetically attracted to each other so that the armature becomes magnetically latched at the limit position to which it is last driven by the coil.

Abstract: A system for injecting air mixed with ozone into a water tank at normal line pressure of about 20 to 60 psi. Water from the outlet of the tank at, or near, the bottom of the tank is pumped through a by-pass circuit back into the tank near the bottom, and the output of an ozone generator is entrained with the water in the by-pass circuit. In the preferred form, the pump is of the kind capable of developing a suction at its inlet, the water is fed to it through a restrictor so that at the inlet the pressure is lower than the pressure in the ozone generator, and the gas is fed at the inlet of the pump.

Abstract: A multi-spindle automatic screw machine having its principal working parts mounted on a weldment. A circular array of tool holders is mounted directly on top of the weldment, and a corresponding array of work spindles is mounted coaxially and in end-to-end confrontation with the tool holders upon a shaft cantilevered on the weldment.

Abstract: A control circuit for an inductive load comprising a relatively large capacitor, means for charging it through an SCR, and means for discharging it through the inductive load for energizing the load and simultaneously inhibiting the SCR so long as the discharge path for the capacitor remains closed.

Abstract: Method of implanting an intraocular lens comprising the step of transilluminating the lens as it is introduced into the eye. In the preferred form two sources of light are used, complementary in color so that the edges of the lens glow white while it is properly aligned, and show color when it is moved out of alignment.

Abstract: An intraocular lens that provides accommodation in response to contraction and relaxation of the ciliary body. Accommodation is achieved by motion of the lens, or of an element of a lens system, alternately toward and away from the fovea. Means are provided for biasing the lens, or the movable element, toward the fovea so that when the ciliary body is fully relaxed the lens is at its closest position to the fovea, and as the ciliary body contracts it counters the bias and causes the lens to move away from the fovea and toward the cornea.

Abstract: A variable ramp voltage generated by a first 555 timer is applied to the control electrode of a second 555 timer for controllably varying the delay function of the second timer. The second timer is triggered in accordance with the motion to be observed, several trigger signals being applied during each ramp. The output signals from the second timer are thus timed at progressively longer intervals from the respective input signals during each ramp. The output signals are applied to trigger a stroboscope, producing a cinematographic slow motion view of a selected portion of the motion under observation.