General Alarm Contact Maker
Abstract
The sample contact maker was set up at this Laboratory in suitable test circuits where its performance was carefully observed for compliance with the requirements. An inspection of the sample to determine compliance in the matter of materials, design, and workmanship, concluded the test. The subject contact maker was in general throughout the test following minor repairs. It was necessary to add a rivet to the angular extensions at the lower part of the relay mature to maintain correct alignment of the armature and to elongate the hinge pin slots in the levers linking the armature rand the counter-weight. The screws securing the motor to its base loosened under shock and had to be tightened. Larger screws provided with lockwashers should be used. The contacts showed no excessive pitting or burning at the end the test. An inspection of the contact maker at the conclusion of all tests disclosed that the center laminated springs supporting a movable contact had been broken. ln addition, some of the thinner laminations of the remaining springs were found broken. It was also noted that no provision has been incorporated to prevent radio interference. The sample contact maker checks with the manufacturer's drawing, except that the specified zinc plating was omitted from many of the parts. The mounting panel, piece 3, shown in the sectional views as one piece, is of two pieces of sheet steel, totaling the thickness shown.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 20, 1939
- Accession Number
- AD1158905
Entities
People
- J. R. Coomes
- J. S. Bryant
Organizations
- United States Naval Research Laboratory