Abstract: A backstop for a reducer having a casing comprises a one-way cylindrical clutch having a plurality of circularly arranged locking elements therein engaged by the periphery a reducer input shaft passing axially therethrough. To achieve a precise concentricity of the reducer shaft and the circularly arranged locking elements so that each element is stressed, the clutch is loosely housed in and loosely keyed to a clutch casing which is in turn firmly attached to a portion of the reducer casing and the one-way clutch and circularly arranged locking elements are then bushing aligned concentric with the reducer input shaft extending axially therethrough.

Abstract: A solid state ballast for starting and operating a plurality of fluorescent lamps comprises a plurality of parallel connected, series LC circuits each coupled by a capacitor to a lamp so that voltage existing across the series capacitors is applied across the lamps and driven by an inverter at a DC power source voltage and at a selected frequency high enough to develop a lamp starting voltage but substantially below their resonant frequency. After starting the resonant frequency of the LC circuits is reduced substantially below the selected frequency by the added capacitive reactances of the coupling capacitors whereby the destructive high voltage at the upper and lower resonances is avoided and the independent selection of the values of L and C and the coupling capacitors to control starting voltage and conduction after starting at the selected frequency is provided.

Abstract: An arrow rest including, a support plate detachably connected to one end of a non-circular rod slidable longitudinally in a non-circular bore in a body member mounted in a bow handle, a coil spring biasing the rod and arrow rest outward from one side of the bow handle, a first threadedly adjustable screw member in the body having a one way connection with the rod variably limiting the outward movement of the arrow rest under the spring bias and a second screw member threadedly adjustable in said first adjustable screw member having an operative connection with one end of the coil spring for varying the bias on the rod and arrow rest whereby either the position of the arrow rest or the spring biasing force acting thereon may be adjusted without affecting the adjustment of the other.

Abstract: Sawdust collection apparatus for a motorized table saw includes a specially formed and hinged, table top saw guard and sawdust collector to which one end of a vacuum hose is connected in a manner to admit air bleeding so as to safely lower the vacuum therein when the other end of the hose is connected to a relatively strong vacuum source, a deflector element to be mounted on the swinging saw cradle below the table in the saw base for directing sawdust downwardly to a collector bag, foamed synthetic material for sealing various openings in the saw base and a conveniently removable bracket for supporting the vacuum hose above the saw table.

Abstract: A task light for mounting relatively close to an underlying work area has an elongated fluorescent bulb extending across the work area, a wide, flat and elongated prismatic lens underlying and adjacent the bulb for distributing light over the entire work area and a transparent sheet overlying the prismatic lens between the lens and the bulb having areas of various degrees of translucency calibrated to diminish the intensity of light rays directed toward certain sections of the work area contingent upon the configuration of the work area and the distance the task light is positioned therefrom.

Abstract: A rapid start circuit for starting and step dimming a fluorescent lamp includes a voltage step up auto transformer and lamp filaments for starting, ballast and a pair of capacitors having different values variously connected in series with the lamp and ballast by a rotary switch; first in parallel, then individually and then in series to achieve a progressively stepped dimming of the lamp. A second form of the invention includes a first capacitor in series with the lamp and ballast for reducing the maximum light output of the lamp and a plurality of capacitors each having a different value selectively connected in parallel with the first capacitor by a slide switch to selectively dim the lamp; and a resistor in series with the first capacitor to diminish arcing and noise when switching. Both forms of the invention include a pair of secondary windings for maintaining filament voltage.

Abstract: A device for resiliently mounting a pair of stabilizer rods for universal angular adjustment on a bow has a central member fixed to the bow and having a cylindrical portion projecting from each end, a pair of intermediate members each has a bore in one end receiving a cylindrical portion for rotation thereon and an axial slot bifercating it's other end, and a pair of outer end members each having a flat sided portion projecting from one end entering a slot and rotatable on a screw passing transversely through the bifercated end portions and the flat sided projection and threadedly engaged in one bifercated portion so as to prevent rotation when tightened; each of the outer end members having means at the other end for attachment of a stabilizer rod.

Abstract: Means for continuously shutting-down operation of an enclosed motor-compressor unit upon predetermined contamination of the refrigerant-oil mixture therein by conductive particles which comprises providing a normally open switch in the motor energizing circuit operated to a closed position by a sensitive D.C. relay when energized, in immersing a pair of spaced electrodes in the refrigerant-oil mixture, connecting the electrodes across an A.C. power source, connecting the D.C. relay in parallel with the electrodes across the A.C. power source through rectifying and voltage dropping means and in providing a fusible link in the A.C.

Abstract: Means for continuously shut-down operation of and enclosed motor-compressor unit for refrigeration or heat pump service when the refrigerant-oil mixture therein reaches a predetermined degree of contamination by conductive particles comprises the provision of a normally closed switch in the motor energizing circuit, a relay which when energized opens the switch, in immersing a pair of spaced electrodes in the mixture, in connecting the electrodes and a capacitor in series across a D.C. power source, in connecting a unidirectional solid state switch and the relay in parallel with the electrodes and capacitor and in providing voltage responsive gating means for turning on the switch in response to a predetermined charge on the capacitor, and in the provision of a normally open fusible switch responsive to fuse and close in response to a predetermined high motor temperature and through relay means opens a second normally closed switch in the motor energizing circuit.

Abstract: A hollow cylindrical, internally and externally screw threaded support member extends through a vertically elongated aperture from side to side through the bow handle and is vertically adjustable therein. The support member has a square head on one end which is vertically slidable in a larger vertically elongated rectangular recess in one side of the bow handle, a nut on the other end thereof when tightened clamps the support member in a vertically adjusted position, an arrow rest is attached to the outer surface of the square head, and a hollow cylindrical, externally screw threaded member carrying a spring pressed arrow spacing plunger slidable longitudinally therein is threadedly engaged in said support member for horizontal adjustment.

Abstract: A hood-like saw blade guard for a radial arm saw is mounted for free vertical movement on a support frame detachably connected to the suspended saw blade driving motor housing. The guard extends over the entire saw blade when in its downward position and is contoured on both sides so as to be easily elevated upon contact with a workpiece, one contoured side is closed and offset radially from the saw blade to provide a sawdust chute and permit vertical removal of the guard from the frame. A spreader with an anti-kickback device thereon is mounted for vertical adjustment on the frame and guards the open contoured side, and vertically adjustable hold-down means on the frame variably limits vertical upward movement of the guard so as to hold down a workpiece when ripping.

Abstract: The radial arm of a radial arm saw formed of sheet metal has a horizontal top wall and a pair of vertical sidewalls which are formed horizontally inward at their lower edges as to form ledges for supporting the opposite sides of a longitudinally slidable saw carriage thereon, two pair of longitudinally spaced low friction elements mounted on one side of the carriage with the elements of each pair bearing against opposite sides of one vertical sidewall guides the carriage longitudinally on the arm, and two low friction elements mounted in longitudinally spaced relationship along one side of the carriage and resting on one of the ledges and a single low friction element mounted on the other side of the carriage midway between the two support the carriage vertically on three points.

Abstract: The butt sections of the limbs of a take-down bow are loosely received in inwardly extending sockets in the ends of a bow handle section and are arranged to rock in a fore and aft direction on outer end portions of the rear socket walls. Inwardly extending T slots in the rear socket walls slidably receive headed members fixed in the bow limbs and prevent forward movement of the bow limbs. Members supported near the socket bottoms for fore and aft screw threaded adjustment receive the inner ends of the limbs, and spring pressed detents projecting centrally from the headed members snap into apertures in the rear socket walls when the inner ends of the limbs are properly inserted into the screw threadedly adjustable members.

Abstract: Means for shutting down operation of an enclosed motor compressor unit for air conditioning and heat pump service consists in immersing a pair of spaced electrodes having a potential gradient thereacross in the refrigerant-oil mixture in the unit enclosure and in employing the ion and electron flow across the electrodes resulting from contaminants in the mixture to break the motor energizing circuit through relay means, and in the provision of a normally open fusible switch responsive to close in response to a predetermined high motor temperature and through relay means break the motor energizing circuit. In a simplified modification, the immersed electrodes are directly connected across the power supply leads and cause a fusible link connected in the power supply leads to open and break the motor energizing circuit when sufficient conduction across the electrodes occurs.

Abstract: Meshing radially serrated annular pads projecting from the meeting surfaces of two members of a belt drive tensioning device to provide locked incremental angular adjustment of the members are formed by depressing an annular indentation in each member in the side thereof opposite its meeting side so as to cold flow metal to the meeting side thereof and in coining a serrated annulus in the metal thus transferred.

Abstract: A sawdust collector bag arranged for convenient detachable connection to walls defining an opening through which sawdust is ejected has a hemmed open end and rods extending through the hem are entered into and resiliently retained in retaining clips spaced along and attached to the walls adjacent the opening.

Abstract: A fluid pressure operated valve device for connection to the inlet and outlet sides of a pilot valve has a two part, axially separable hollow cylindrical body with axially aligned inlet and outlet passageways, a side ported hollow cylindrical liner of smaller diameter having a closed end and an open end is fixed in the body with its open end surrounding the inlet passageway, a biased closed valve element reciprocates in the liner and controls the ports, passageway means for applying inlet pressure to the interior of the liner to close the valve element, and passageway means leading from the interior of the liner to the exterior of the valve body and from the exterior of the valve body through the valve body to the outlet passageway.

Abstract: A bow string mounted peep sight has the form of a wheel with an elongated hollow hub tightly receiving the bow string and spokes connecting the hub to a rim. When the bow is in a braced condition with the bow string vertical the rim and spokes are horizontal and when the bow is drawn the sight is very close to the archer's eye and the rim is tilted revealing to the archer's eye sighting openings between the hub and rim irrespective of any rotation of the sight which may occur due to twisting of the bow string.

Abstract: A radial arm saw has arm elevating means employing an elongated nut adjustably attached to the arm and slidably guided in a longitudinal groove formed in a tubular column and a motion transmission screw journalled in the column, means employing like elements for indexing and locking the arm in miter positions and the saw blade in bevel positions, a direct base to column connection providing independent adjustment of base members with respect to the column and to each other, a spring arm for biasing a yoke index pin into indexed positions and for withdrawing it, cam and arm yoke locking means, and simplified fence or table board clamping means.

Abstract: A speed reducer having a power takeoff sleeve loosely receives therein a shaft to be driven. Concentricity and a driving connection of the shaft and sleeve is effected by a pair of telescoping bushings having tapered interfitting surfaces in each end of the sleeve. The inner bushing of each pair is split and grips the shaft when drawn into the outer bushing by screw threaded means. The outer bushings are concentric with and rotatable in the sleeve ends and keyed therein to preclude axial movement. In a first modification the inner split bushings are keyed to both shaft and sleeve and in a second modification the shaft is keyed directly to the sleeve.