Browse Prior Art Database

Fail-Safe Safety Cover Interlock Mechanism

IP.com Disclosure Number: IPCOM000046749D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Halbeisen, RA: AUTHOR [+2]

Abstract

This disclosure relates generally to safety interlocks and more specifically to electrical safety interlocks which prevent the opening of a safety cover over rotating machinery, such as centrifuges and the like. Referring now to Fig. 1, there is shown a machine frame 1 which contains a centrifuge (not shown). A solenoid switch assembly 2 is shown mounted to frame 1 by means of bracket 3 and a pair of bolts 4 which engage a pair of holes (not shown) in a latch mount bracket 5. A handle assembly 6 is mounted to a safety cover 7. Solenoid switch assembly 2 includes a solenoid 8 and a microswitch lock sense switch 9, both of which are mounted on bracket 3. Solenoid 8 includes a spring-loaded plunger 10 which has a cam surface 11 on its end.

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Fail-Safe Safety Cover Interlock Mechanism

This disclosure relates generally to safety interlocks and more specifically to electrical safety interlocks which prevent the opening of a safety cover over rotating machinery, such as centrifuges and the like. Referring now to Fig. 1, there is shown a machine frame 1 which contains a centrifuge (not shown). A solenoid switch assembly 2 is shown mounted to frame 1 by means of bracket 3 and a pair of bolts 4 which engage a pair of holes (not shown) in a latch mount bracket 5. A handle assembly 6 is mounted to a safety cover 7. Solenoid switch assembly 2 includes a solenoid 8 and a microswitch lock sense switch 9, both of which are mounted on bracket 3. Solenoid 8 includes a spring-loaded plunger 10 which has a cam surface 11 on its end. Switch 9 includes an arm 12 which is designed to be actuated only when safety cover 7 is properly closed. Actuation of arm 12 occurs when the rotating machinery reaches a low threshold speed. At this time, solenoid 8 releases plunger 10 and, if cam surface 11 engages and moves a properly positioned secondary cam plate 13, the latter, which is connected to a dual cam plate 14, will be moved along with plate 14 so that a portion of plate 14 strikes arm 12, thereby permitting the rotation of the machinery to go to a desired speed. In Fig. 1, the position of dual cam plate 14 is controlled by a lock/unlock knob 15 which can be rotated 90OE so that cam plate 14 can be rotated from one position...