Abstract: An engine life counter electrically connected to an engine restart switch through a power source of an engine. The counter includes a mechanical type counter having a coil; a quartz crystal oscillating at a stable frequency; a frequency demultiplier having an output terminal and a reset input terminal. The frequency demultiplier is connected to the quartz crystal to produce a standard frequency output. A stabilizing circuit is connected between the power source and the reset input terminal to stabilize and filter power from the power source. A transistor circuit is connected to an input of the coil and the output terminal of the frequency demultiplier for producing a series of pulses in cooperation with the frequency demultiplier. The pulses magnetize the coil at predetermined intervals.

Abstract: An electromechanical pulse counter for counting applied current pulses includes a magnetizable disc-shaped armature mounted for rotation about a fixed axis. Magnetic stepping poles diametrically disposed adjacent the circumference of the armature are momentarily magnetized by a magentic winding upon application of each current pulse to establish diametrically opposed magnetic poles in the armature. Permanent indexing magnets diametrically disposed adjacent the circumference at an angular position relative to the stepping poles magnetically coact with the magnetic poles established in the armature following each current pulse to cause the armature to rotate to align the established magnetic poles with the poles of the indexing magnets. Each subsequent current pulse causes another pair of diametrically opposed magnetic poles to be established in the armature, and the armature to subsequently rotate to align the newly established magnetic poles with the indexing magnets.

Abstract: This invention relates to a resettable mechanical counter. It is an object of the invention to provide such a counter in which the means required to reset the counter constitute a key which can be removed from the counter and can be used to reset a plurality of counters so that the counters are simplified and can be manufactured at lower cost. This object is accomplished by the provision of a resetting slider, which is provided with disengaging cams and adapted to be inserted into tracks provided on the frame of the counter and to be removed from said frame.

Abstract: A position discrimination device for a thumb wheel switch comprises a shift register and a ROM. The output data from the shift register and the data, determined by an inverted output from the shift register and by an output from a conductive terminal which corresponds to a state of the thumb wheel switch, are written into the ROM. The ROM supplies data to the shift register and generates a code signal corresponding to the state of the thumb wheel switch.