Abstract: An electrical fuse comprises a fusible ribbon having one or more weak spots along its axial length which is highly resistant to mechanical fatigue caused by cyclic heating and cooling of the fusible ribbon. The weak spot comprises a series of apertures arranged in a curvilinear or angular configuration extending transversely to the axis of the fuse ribbon between the opposite sides thereof. Centers of adjacent apertures of the series are offset from each other with respect to the axis of the fusible ribbon by a distance at least equal to the shortest distance between the geometric center and the peripheral edge of any one of the adjacent apertures such that the cross-sectional area of the weak spot is distributed transversely across the fuse ribbon.

Abstract: An elongated fuse housing includes a fusible wire longitudinally extended and coaxially mounted within a housing having end terminals. A spring indicator unit is secured to one end and includes a relatively large diameter loosely wound section forming a helical compression spring in combination with an integral, coaxial and tightly wound elongated indicator coil which extends axially of the spring. The spring/indicator unit is located within the housing with the coil spring held compressed by the fusible wire. The one end terminal includes an opening aligned with the wire-wound indicator coil. Disruption of the fusible wire releases the coil spring which expands within the housing to rapidly separate the fuse wire and simultaneously move the elongated wire-wound indicator coil through the opening, thereby indicating operation of the fuse.

Abstract: A lamp and filter mounting assembly includes a lamp holder with a lamp mounting plate and a back wall for pivotal mounting to a bracket. The back wall of the lamp holder includes an inclined adjustment stop that engages the bracket upon rotation of the lamp holder through a predetermined angle. The assembly also includes a filter holder with side rails and a filter stop to hold a filter. The side rails include extensions that overlie the lamp holder to provide a sliding attachment to the lamp holder. The bracket is secured to an aperture pan that is rotatably mounted within a trim assembly. A light shield is secured to the aperture pan and surrounds the lamp holder.

Abstract: A floor treating machine adapted to operate as a floor scrubber and a floor polisher or buffer includes a main housing or support frame structure from which extends a brush housing assembly. The main housing contains a combined solution and recovery tank, a motive device to power the floor treating machine, a propulsion system to propel the floor treating machine along the floor, a pneumatic power system, a squeegee subassembly and electrical and pneumatic control systems therefor. The brush housing assembly is operatively connected to the main housing by a brush lifting mechanism such that two brushes selectively rotating in opposite directions in the brush housing assembly can be lifted away from the floor or moved toward the floor so that the brushes exert the correct amount of pressure against the floor depending on the job being done.

Abstract: A pneumatic positioner with a casing composed of a shell-like bottom part and a shell-like cover part. A membrane plate, is connected through a gas-tight membrane with the side walls of the casing so as to be movable back and forth in the casing in the direction of a drive spindle which is disposed in sealing relationship through the bottom part of the casing. In the bottom part and/or in the cover part, there are arranged one or more gas-conducting connecting pieces. In the casing there are arranged coil springs for producing biasing or restoring forces. These springs abut, on the one hand, the membrane plate and, on the other hand, the bottom part or cover part. On the membrane plate of one embodiment there is provided for each coil spring at least two supporting surfaces which present different spacings from a plane perpendicular to the direction of motion of the drive spindle and upon which the coil springs are replaceably disposed.

Abstract: A wound core transformer is described which features low core losses by the addition of magnetic material in those sides of the wound core which are located outside of the coil. In one embodiment the wound core includes: a base-core is formed from two strips of magnetic material of generally uniform thickness and wrapped about each other in the form of a closed rectangular loop with the ends of each strip offset from each other and the ends of the adjacent strip; and a filler strip of magnetic material which is interleafed between the two strips forming the base-core with its base disposed adjacent the ends of the strips forming the base-core. An electrical conductor is disposed opposite the filler strip and wrapped about the two strips forming the base core so as to form a coil. Under this arrangement, the magnetic induction formed in that side of core containing the base portion of the filler strip is lower than that side of the core around which the coil is wrapped.

Abstract: A three part split shaft seal assembly is disclosed which is particularly adapted for use in an overhung steam turbine. In one embodiment the assembly is located between the shaft opening of the turbine case and a horizontally split shaft bearing case. To facilitate axial insertion and removal of the assembly, the seal assembly is formed from three pairs of split ring seals. Proper axial alignment is maintained by stand-offs or dowel pins located between two of the split ring seals. In one embodiment a snap ring received within an annular groove in the turbine housing holds two of the seal rings against axial movement. In that embodiment set screws carried in one ring seal are used to seat and align two ring seals of the assembly relative to the turbine casing. A pin holds two of the ring seals against relative rotational movement. In another embodiment, a split spacer ring is used to maintain correct spacing and the third seal is used to position and hold the other two seals axially aligned to each other.

Abstract: An electrical fuse wherein one or more portions of the fuse element are provided with two adjacent parallel weak spots separated by dielectric material or air gap, and arranged such that the direction of current flow in one of the adjacent weak spots is opposite that in the other adjacent weak spot, such that a magnetic field is generated which produces a separating force between the two weak spots. Arcs formed during the fusing of the weak spots are forced apart by the generated magnetic field thus increasing the arcs path lengths which increases arc voltage thereby forcing arc current to zero.

Abstract: An indicating fuse is provided with an indicator at the free end of a movable spring contact, the indicator being located at an angle with respect to the plane of the spring contact. Provision is made for lower rated fusing currents utilizing the same basic fuse structure by forming a slot in the flexible spring contact at the point of maximum bending. A rounded shoulder is formed on the fuse carrier body across which the spring contact member is bent to minimize breakage and damage. The flexible spring contact is integrally formed with a U-shaped terminal that mounts it on the fuse carrier body, a second substantially identical generally U-shaped terminal also being secured to the fuse carrier body to provide a fixed contact. Molded ribs are formed in the insulating material of the fuse carrier body adjacent the open ends of the U-shaped terminal members to prevent the terminals from pinching together to form an undesired tapered configuration.

Abstract: A transducer for converting an electrical current signal to a pneumatic pressure. A solid state element such as piezo-electric flapper element 48 is used to vary the pressure drop through a nozzle 46 to provide a controlled pressure supply 28. A micro-power electronic circuit 59 controls the flapper. A solid state pressure sensor 24 detects the output pressure and provides a feedback signal for use in a negative feedback loop to control the flapper element. The flapper element may be triangularly shaped to reduce its responsiveness to relatively low frequency mechanical vibrations. In a exemplary embodiment, where intrinsic safety requirements limit terminal voltages, the flapper element is driven by a transconductance amplifier 94 which is powered through a shunt regulator 82 and a voltage tripler 92. The shunt regulator provides operating potentials which are derived from the signal current.

Abstract: A liquid propane gas fuel system includes a propane fuel tank. A two stage pressure regulator defined by a housing with a fuel inlet and a fuel outlet is also included. A first fuel conduit extends from an outlet in the fuel tank to the fuel inlet in the pressure regulator. The system supplies fuel to an engine that includes an exhaust gas manifold. A thermoconductive mounting bracket is secured to the housing of the pressure regulator and manifold to transmit heat from the manifold to the regulator in proportion to the load imposed on the engine. A chokeless carburetor is also included in the system and is in fluid communication through a second fuel conduit with the outlet of the pressure regulator. In an alternative embodiment, a heat exchange ris included in the first fuel conduit. In a second alternative embodiment, an electric heating element is positioned within the housing of the pressure regulator.

Abstract: A fuse mounting arrangement for a pad mounted underground electrical power distribution systems includes at least one fuse panel which is slideably mounted by means of slide bearing assemblies in a housing enclosure. The fuse panel is removably mounted on the slide bearing mounting channel by means of cooperating tabs, slots and C-shaped loops or eyes. Should a fuse panel or its associated power fuse require replacement, safety interlock means including fixed locking pins and a cooperating U-shaped handle having hooked portions for engaging the locking pins are provided. It is imperative that the fuse panel and its fuse be electrically isolated prior to removal or withdrawal of the same from the housing enclosure. Therefore, the fuse elbow connector and its associated line conductor are disposed in front of the handle which is pivotably mounted upon the fuse panel between a locking position and a release position.

Abstract: A unique design and construction is presented for the rotor of a dynamoelectric machine. The rotor is comprised of two end plates, bar means for holding the end plates together, a stack of pole laminations, electrical conductors wrapped about the laminations and an insulator means. The end plate contains apertures about its periphery such that the rotor can be balanced about two axis perpendicular the rotor axis of rotation by inserting masses/weights into the apertures. The insulator means electrically insulates the electrical conductors from the ends of the stack laminations, the rotor end plates and the rotor shaft. The insulator means by its unique shape further acts as a guide to position electrical conductors about the laminations during pole winding. In one embodiment the insulator means acts as a thermal insulator protecting electrical conductors when the bar means are welded to the end plates.

Abstract: An interrupter is provided having: an outer enclosure or tank adapted to contain an arc-extinguishing fluid; a fixed tubular electrical current carrying member disposed at one end of the tank; a movable tubular current carrying member disposed in the tank in an end-to-end relationship with the fixed electrical current member; a prime mover for stroking the movable current carrying member between an open position and a closed position; an electrically conductive piston means, carried by the movable electrical current carrying member, for supplying pressurized fluid into the gap formed between two current carrying members when the interrupter is opened and for purging the vicinity of the gap when the interrupter is closed; a non-electrically conductive base means, carried by the outer enclosure, for housing the piston means and for guiding the movement or the stroking of the movable current carrying member; and an insulated plenum means, carried by the piston means and disposed around the contacting ends of the

Abstract: The electronic watt-hour meter (10) comprises an electro-optical watt-hour sensor (12) adapted to be coupled to a consumer's connection to a source of electric power for sensing voltage supplied to, and the current drawn by, the consumer's electric load and for producing output signals indicative of a quantity of watt-hours of power utilized by the consumer. In the meter (10) a microprocessor (22) is coupled to the sensor (12) for receiving output signals therefrom and a memory (29) is coupled to the microprocessor (22) for receiving and storing data. A power supply (24) supplies D.C. power to the microprocessor (22) and includes a clock signal generator to supply a 60 Hz. clock signal to the microprocessor (22). Also a visual display (30) is coupled to the microprocessor (22) for providing a readout of the power consumed since the last reading of the solid state watt-hour meter.

Abstract: A tensioning device for prestressing the rod members and transverse members connected thereto and operatively associated therewith has a jack assembly connected between at least two rod members and disposed to engage the transverse member, the jack assembly includes an expansion member such as a piston which can exert tensile forces incrementally on the rod members and the transverse member to evenly stress the same to a predetermined level. The tensioning device may have a pressure plate between the jack assembly and the transverse member to exert a more uniform pressure along the entire transverse member.

Abstract: A panel mounted fuseholder has a cylindrical base and a head which fits into and locks unto the base by a shock proof, bayonet connection. The base has a rear terminal and a cylindrical side terminal for connection of the fuseholder in series with the circuit to be protected. The head has an insulative endcap and a conductive bayonet insert. A pair of "U" shaped fingers extend from one edge of the cylindrical side terminal to form the base side of the bayonet connection. The head side is formed by a pair "J" shaped arms which extend from one end of the bayonet insert. Protrusions extend from the interior surface of the bight of the "U" shaped fingers. The protrusions are dimensioned to make continuous contact with the outside surface of the "J" shaped arms when the arms are inserted within the fingers to thereby prevent loss of power to the protected circuit.

Abstract: An apparatus for clamping a pair of cables includes a clamp body of a clam shell configuration. The body includes first and second legs joined by an integral hinge. The clamp body and hinge are fabricated of a deformable material. First and second diagonal grooves are formed in the first and second legs and disposed at approximately a right angle to each other. First and second cables are placed in the grooves and the clamp closed over the cables. A one piece fastener such as a self-tapping screw is employed to close and tighten the clamp body about the cables partially deforming the clamp body and providing primary and secondary gripping forces on the cables.

Abstract: A "wall wash" assembly for use with a ceiling mounted, recessed lighting fixture comprising a reflector housing having an open end, includes a ring member dimensioned for receipt in the open end of the reflector housing. A concentric ring segment is mounted on the ring member for movement 360.degree. thereabout. An auxiliary reflector is mounted on the ring segment for movement therewith. Positioning of the auxiliary reflector by movement of the ring segment with respect to the ring member provides a desired "wall wash" illumination pattern. An optional baffle member is receivable on the ring member opposite the auxiliary reflector for blocking light emanating from the reflector housing to be excluded in the "wall wash" illumination pattern.

Abstract: A cable reel apparatus includes a rotatably mounted cable spool in a fixed support. A locking pin is provided on the support and is engageable with the spool to hold the spool and cable hook-up in a fixed position. A gear unit connected to the support includes a spool gear rotatably mounted on a spool shaft and a spring gear coupled to a spring motor. Friction drive discs are located to the opposite sides of the spol gear and coupling discs abut the drive discs. The coupling discs are connected to the spool shaft. "Belleville" disc springs are mounted in abutting engagement with the outer coupling discs and the nut is threaded on the shaft to collapse the springs onto the coupling discs to increase the spring force and lock the gear to the shaft. The nut may be released to reduce the spring force and effectively decouple the shaft and gear, thereby permitting controlled release of the tension in the spring drive means.