Abstract: The film image is illuminated by the bulb or by ambient light admitted through an aperture on the top of the viewer. The image is projected on a folded light path onto a screen pivotally mounted on the underside of the upper housing to depend into the viewing chamber in the lower housing. The lower housing is pivotally connected to the upper housing and contains a power mirror reflecting the image on the screen into the eyes of the user. When the lower housing is folded (collapsed) over the upper housing the screen pivots into the space between the housings. The screen pivot is moveable to change the screen distance from the power mirror (and the film stage), to adjust the toe-in required of the viewers' eyes for optimism viewing comfort. The microfiche carrier mechanism is generally U-shaped to straddle the light path to the film stage and is positively driven back and forth relative to the housing film stage and engages the fiche on each side of the light path to move the fiche laterally.

Abstract: The log splitter has a tie rod hydraulic cylinder which connects the beam to the wheeled assembly including the engine and hydraulic pump. The hydraulic cylinder is the only structural connection between the assembly and the beam. The high loads on the cylinder head are transferred to a butt plate on the beam end to which the tie rods are connected. Therefore, the connection of the hydraulic cylinder to the wheeled assembly does not impose high loads on the assembly.

Abstract: The insulative stand-off is mounted on a frame and supports a heating coil. In the preferred embodiment the coil loops engage retention surfaces inside the inverted T-shaped opening in the end of the stand-off. The sides of the stand-off forming the opening have cam surfaces which squeeze adjacent central loops together during mounting while the loops adjacent the central loops are deflected to the outside of the stand-off. When the central loops reach the crossbar of the T they spring apart to fix the coil. Other embodiments are shown--all have retention surfaces generally parallel to the coil loops and transverse the coil axis. Cam surfaces control access to the retention surfaces to deflect the loops as they are moved to the retention surfaces and the coil resiliency biases the loops into engagement with the retention surfaces when mounting is completed.

Abstract: The open topped telescoping bunker body is filled from above and material in the body can be discharged when the tail gate at the rear is opened. A double acting push plate is used to push material through the open tail gate and material falling into the body ahead of the push plate during discharge can be ejected through the open front end of the body ahead of the plow blade. The plow blade levels the material to form a roadway as the skid mounted bunker is pulled forward. The blade can be raised to allow passage of men or material under the body. The push blade moves with and with respect to the moving part of the telescoping body.

Abstract: The microfiche projector enlarges the image onto the flat white undersurface of the top panel of the enclosure which has a flat black interior. The viewer sees the image reflected in the adjustable 45.degree. mirror. The apparent image is about 50" in front of the user to reduce eye fatigue. The image is non-directional which allows considerable movement of the user.

Abstract: Each of the motor stator poles has a window cut out which functions to create an unbalanced flux distribution and move the magnetic neutral off the centerline of the stator pole. A plurality of permanent magnet rotors are mounted on a common shaft to permit a desired rotor to be moved into the stator field. Each rotor has a different number of poles selected so with any rotor there will always be a whole odd number of poles within the span of a stator pole. Speed is determined by the number of poles in the rotor in operative position.

Abstract: The valve opens in response to a predetermined small pressure differential acting across the valve. As the pressure differential increases, the valve throttles the flow and when a high pressure differential exists the valve closes. The valve is designed to be placed in a by-pass circuit in an automotive air conditioning system to provide adequate flow under low cooling loads to cool and lubricate the compressor. Under normal and high evaporator loads, the by-pass flow is throttled or closed off completely to avoid needless consumption of energy.

Abstract: A vacuum switch in which the diaphragm movement with increasing vacuum is opposed by two springs which determine the vacuum required to actuate the switch. As the vacuum subsequently decreases one of the springs is rendered inoperative before the switch resets so the reset vacuum is determined by the one spring remaining effective. The spring which is rendered inoperative is compressed between the actuator and an eyelet which can seat on the actuator (spring ineffective) or the housing (spring effective) and which also functions to limit motion of the actuator relative to the eyelet so the switch operated by the actuator cannot be overstressed.

Abstract: Four switches are arranged at 90.degree. to each other. Each switch has a reversely bent blade having a short leg pivoted on a center terminal and a long leg having its free end normally spaced from a normally open terminal while the reversely bent portion engages a normally closed terminal higher than the other two terminals whereby the normally open terminal of an adjacent switch can be positioned under the normally closed terminal. The actuator handle actuates opposed parallel pairs in unison whereby one of the pair is actuated to close on its normally open terminal when the actuator moves in one direction and the other of the pair is so actuated when the actuator is moved in the opposite direction.

Abstract: An electromagnetic drill stand, of the type having a drill driven by an electric motor and mounted on a stand provided with an electromagnetic coil in the bottom of the stand to secure the stand to ferromagnetic material when the coil is energized, is provided with switch means preventing operation of the motor when the coil is not energized, said switch means being mounted in proximity to said coil and responsive to the magnetic flux of the coil for controlling the power supply to the motor and operative to interrupt the power supply in absence of a predetermined flux density.

Abstract: The coiled resistance heating wire is supported on electrical insulating stand-offs in a figure 8 pattern on each side of a metallic radiation panel. The radiation panel and the figure 8 arrangement of the coil each contribute to increased heat transfer to air flowing axially down the assembly in a duct and in combination result in even more efficient heat transfer.

Abstract: The inlet to the water valve is provided with a resilient flow control device which deflects under pressure to reduce the inlet orifice and maintain substantially uniform flow. On the outlet side of the flow control the liquid is forced to turn at right angles to reach the multiple restricted orifices where the liquid again must turn 90.degree.. At low pressures the flow is divided between 8 orifices 4 of which are gradually shut off by deflection of the flow control so at high inlet pressure the flow is divided among 4 orifices positioned in channels protecting them from being shut off by deflection of the flow control. The reduced velocity caused by the two 90.degree. turns in flow results in substantial reduction of flow noise.

Abstract: The four-way reversing valve is utilized in refrigerating systems for heat pump applications to interchange the heating and cooling effects of the evaporator and condenser. The three-way pilot valve controls application of high or low system pressure to the end of the chamber adjacent the large piston. The different areas of the two pistons result in movement of the slide valve to the left (both modifications) when high pressure is applied and to the right when low pressure is applied.