|The PMC Model CS 402 Cam Switch
combines in a compact 1-1/16" diameter unit all the functions of a
conventional plate cam, cam follower and snap-action switch. External
screwdriver adjustments permit rapid setting of any desired switch make
angle. Designed for timing, indication, control, computation and other
applications where snap action switching is required, it permits the
instrument and servo designer to meet specific application requirements
through use of a single component that can be mounted in a gear assembly
in a manner similar to synchros, potentiometers and other rotating shaft
components. Because the CS 402 Cam Switch replaces conventional cam
mechanisms, independently mounted switches and their associated hardware,
it provides significant savings in design, fabrication and assembly time.
Its small size permits significant improvements in miniaturization of the
Adjustment of the CS 402 Cam Switch can be accomplished rapidly and precisely while the shaft is either stationary or rotating, by means of two external adjusting screws, and can be completed within seconds. As a result, it provides a unique means for ‘trimming-in’ required performance in production or during equipment maintenance. Conveniently located locking screws maintain switch settings underall conditions of shock and vibration encountered by military equipment. Model CS 402 Cam Switches incorporate standard type SPDT, subminiature, snap switches and are available as single-switch units, or as multi-ganged types with as many as 10 switches. Both single and multi-stack types can be supplied with double-ended shaft for mounting dial or indicator. All types meet applicable requirements of MIL-E-5400. Complete mechanical and electrical specifications are given below.
NOTE: peak torque occurs at switch actuation. With all switches in a multi-switch unit set to identical on-off positions, the total maximum torque will not exceed n x 1.0 oz-in., (where n is the number of switches in the stack). With different switch settings the total maximum torque may be as low as 0.5 x n x 1.0 oz-in., depending upon the specific on-off settings.
FOR PARTICULAR REQUIREMENTS
Precision Mechanisms Corporations will be pleased to quote on variations for the CS 402 Cam Switch for special requirements. Readily available variations include:
A) non-standard shaft extension
B) double-ended shaft extension
C) ultra low differential switches
D) multi-switch units mounted in gear train mechanisms for specific switching
functions, with or without motor drive