Backstop for Electromagnetic Actuators
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
A backstop system for electromagnetic actuators has primary and secondary energy-absorption members designed to adjust for temperature-related expansion and contraction. As shown in the drawing, an electromagnetic actuator comprises magnetic core 10 with poles 11, winding 12 and pivoted armature 13. A backstop assembly 14 consists of ridged mounting plate 15, absorption plate 16 and bumper plate 17 sandwiched together by screw 18. Bumper 19 is threadedly attached to one end of bumper plate 17 and has bumper pad 20 aligned to engage armature 13 at the rest position. Bumper 19 is rotatable for adjusting the rest position of armature 13 and its magnetic gap with poles 11. A nylon washer 21 or other nonmetallic interface is necessary to prevent fretting corrosion between screw 18 and plate 17.