DIGITAL SELECTOR SWITCH.
Abstract
The function of the Digital Selector Switch is to permit time selection from 0.1 to 999.9 seconds. An engineering survey was initially conducted and its findings indicated glass reed-type switches well suited for this application. The first design considerations were to determine the ideal switch sensitivity, permanent magnet strength and minimum allowable spacing between adjacent switches. A series of experimental tests were conducted and the values for switch and permanent magnet combination were determined. Thirty test modules were fabricated; each module housed five reed switches and served as switch holder during environmental testing. The switches were subjected to vibration, high-low temperature and thermo-shock environmental testing. Various packaging concepts were investigated and a number of feasibility models were fabricated to test these concepts. The most promising model consisted of mounting a permanent magnet to a moving tape. The tape serves the dual function of transporting the magnet to the appropriate switches, and provides a visual indication of the time set-in by viewing a number inscribed on the tape. This concept readily lends itself to push button position selection.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 12, 1964
- Accession Number
- AD0608669
Entities
People
- Maurice Lefka