Abstract: A tamperproof rotary valve which includes a valve body having a fluid flow passage extending therethrough. The passage is intersected by an actuator opening in the body and defining a valve chamber thereat. A rotary valve is disposed in the chamber for opening and closing the fluid flow passage. An actuator is journaled in the actuator opening and is coupled to the rotary valve for rotating the valve. A groove is formed about the actuator, and a contractible/expandable locking ring is disposed in the groove and projects outwardly of the groove beyond the bounds of the actuator when in a free, expanded condition. The locking ring is contractible into the groove to allow assembly of the actuator into the actuator opening. A locking groove is formed in the actuator opening in the valve body and into which the locking ring expands when the actuator is in a proper assembled position in the actuator opening.

Abstract: A chemical barrier for rodents and/or reptiles including an elongated flexible, porous fabric tube 22 of a generally rope-like size, shape and flexibility contains a plurality of elongated bodies, 24, 26 . . . of granular repellent material 28. The bodies 24, 26 . . . are spaced from each other by short, generally repellent free gaps 30 within the tube 22 and the size of the granules 28 in each body is sufficiently large that they cannot pass through the fabric forming the tube 22. Barriers 32 at the gaps 30 prevent the entry of the repellent material 28 into the gaps and allow the tube 22 to be severed in the gaps 30 within spillage of repellent material 28.

Abstract: A muting circuit for a transconductance amplifier has a switch connected across the signal load of the amplifier to short circuit the output.

Abstract: A turbine engine including a rotary compressor 10 to be driven by a turbine wheel 12 and provided with an annular combustor 36 including an outlet 44 whereby gases of combustion may be directed to a nozzle 46 to be directed against the turbine wheel 12 to drive the same. Fuel injectors each include a simple tube 70 having a cut off end 72 disposed in a ring-like mounting element 100 which in turn mounts a plurality fo swirler vanes 106 which cooperate with a converger 94 having a central aperture 96 aligned with the end 72 of the tube 70 that provides highly stable combustion within the combustor 36.

Abstract: A paper trimmer having a base cover and cutter blade handle formed of molded synthetic resin. The base defines a plurality of upwardly opening recesses. The cover is pivotally mounted to the base for selectively closing one or more of the recesses. The base includes a support wall immediately subjacent the cutting edge of the fixed cutter blade mounted thereto for improved long, troublefree cutting operation by the paper trimmer.

Abstract: A seal for a pump impeller (22) comprising an annular ring (50) freely received within a cylindrical opening (56) in the pump housing (12) and disposed around a cylindrical portion of the impeller (22).

Abstract: A window operator has a prime mover for opening and closing of a window, with the prime mover being drivingly connected to a drive output member through an intermediate gear structure. A clutch device in the drive structure senses the torque applied to the drive output member in a window closing operation and a switch operable by the clutch is effective to deenergize the prime mover when the torque applied to the output member reaches a predetermined value. The switch can be adjustably located relative to the clutch whereby the predetermined value at which the motor will be deenergized may be varied in order to obtain a desired tension on a member connected to the closed sash of the window, such as a chain connected to the sash of a skylight window.

Abstract: So-called suck-in (FIG. 6) and banana-ing (FIG. 7) in a plastic tank for a vehicular radiator having elongated side walls 102, 104 connected by short end walls 106, 108 and having an opening 112 surrounded by a peripheral flange 114 which in turn includes a planar sealing surface 124 is eliminated by the provision of a substantially continuous, peripheral bead 140 about the tank generally parallel to the flange 114 and in close adjacency thereto.

Abstract: A control for a window operator is operable to control incremental movement of a window. The control includes means for developing a command to selectively move the window in a direction to an open or closed position, and means for determining when a plurality of motor drives have moved the window a preselected incremental distance. Means are coupled to the developing means and the determining means for energizing each of the motor drives if a command is developed, until the motor drives have moved the window the preselected incremental distance and thereafter deenergizing the motor drives until another command is received to move the window a subsequent incremental distance in the selected direction.

Abstract: A ground fault current interrupter (GFCI) circuit is provided with the additional capacity of detecting and protecting against arcing between a power line and the metal sheath or cover of a power cable. An arc protection winding is located on the core of the GFCI differential transformer and is connected in series with a resistance between the metal sheath and a neutral or return line. By adjusting the number of turns of the arc protection winding and the size of the series resistance, the sensitivity of the arc portection arrangement to arcing current may be set at a desired level.

Abstract: A system and method for obtaining a given preload on a spring for use in a device which requires a given spring setting or preload. A receptacle is provided for containing the spring and including at least one member positionally movable in response to the spring setting. First shims are placed between the receptacle and the spring for adjusting the spring setting outside the device while the positiion of the movable member is fixed at the given preload. Second shims are placed between the receptacle and a portion of the device for readjusting the spring setting inside the device at the given preload. An access opening through the device affords observation from outside the device of the position of the movable member inside the device to compare the readjustment with the first adjustment.