Abstract: Methods and apparatuses for a trailer braking system for use with a fifth wheel hitch, a gooseneck hitch, or the like. A braking system for a trailer pulled by a tow vehicle includes an arm member extending downward from and pivotally connected to an upper portion of the trailer and a surge brake actuator connected to the upper portion of the trailer that is configured to control braking of wheels of the trailer. When the tow vehicle decelerates, inertial force caused by forward momentum of the trailer pivots the arm member such that force is exerted on the surge brake actuator to actuate the brakes of the trailer.

Abstract: Methods and apparatuses for a trailer braking system for use with a fifth wheel hitch, a gooseneck hitch, or the like. A braking system for a trailer pulled by a tow vehicle includes an arm member extending downward from and pivotally connected to an upper portion of the trailer and a surge brake actuator connected to the upper portion of the trailer that is configured to control braking of wheels of the trailer. When the tow vehicle decelerates, inertial force caused by forward momentum of the trailer pivots the arm member such that force is exerted on the surge brake actuator to actuate the brakes of the trailer.

Abstract: A squib simulator and dispensing equipment tester has a threshold circuit d simulated load connected to a double-pole magnetically latching relay that switches contacts and turns on a test indicator lamp when the dispensing equipment delivers an input pulse of sufficient amplitude and duration. A power supply provides a logic level through a feedback circuit and the latching relay to the dispensing equipment indicating the status of the squib as either fired or faulted. A reset switch also uses the power supply to reset the latching relay for additional tests.

Abstract: An energizing and test circuit for a gyroscope spin motor which in addition o having a set of energizing coils, also includes a reference coil which generates a sinusoidal voltage whose frequency is a function of speed of rotation of the spin rotor. This signal is fed to a precision tachometer circuit whose output is compared with a desired speed signal for generating a voltage required to maintain a proper spin rate and comprises what is referred to as a "sustain" voltage. The sustain voltage is buffered and coupled to an external test point which can be monitored to determine the functional integrity of the gyro and more particularly the quality of its motor bearings. This sustain voltage is also coupled to drive amplifier circuit means which power the head coil assembly including drive windings of the spin motor. Circuitry is also provided for performing an automated spin-up and spin-down test.

Abstract: A high pressure rotary union includes a housing enclosing a hollowed shaft. seal enclosure is keyed within the housing and receives a sealing ring which is biased by a circular spring to maintain low friction intimate sealing engagement between the ring and shaft despite minor eccentric shaft displacement.