Abstract: An intruder alarm security device includes a source of fluid under pressure which serves as a medium for oscillating a diaphragm at the throat of a horn to create an audible warning signal. The intruder alarm includes an actuator, a plunger assembly and connecting structure for coupling rotary movement of the actuator to longitudinal movement of the plunger assembly to open communication between the diaphragm and the source of fluid. The or connecting coupling structure includes a lost motion connection so that the plunger assembly is controlled by the actuator only to the point of opening the communication. And, the plunger assembly includes an orifice member for metering the flow of medium to the diaphragm, yet, first is capable of allowing any entrained particulate from a closure of the source to clear the device.

Abstract: An improved remote register is provided with a novel locking device for prevention of rotation of the digital counter upon removal of the register cover. The cover includes an integral cam positioned to disengage the lock upon replacement of the cover. The remote register further includes integral mounting brackets and an electromagnetic relay having a unitary pawl and armature.

Abstract: A clock "friction" for use in clocks having plastic gear wheels which permits manual setting of the hands but in which a reliable level of frictional torque is obtained without requiring use of any auxiliary parts. The centerwheel of the clock has an interference fit with respect to the center, or minute hand, shaft upon which it is telescoped, and the minute hand shaft is formed with an annular groove lying generally in the plane of the centerwheel into which the plastic relaxes and flows for maintaining the centerwheel in a desired axial position. The minute hand shaft has a setting knob, and means are provided for precluding axial shifting of the center shaft, by pushing or pulling, which might result in stripping of the plastic in the groove.