Boots – shoes – and leggings
Patent
1991-10-30
1994-04-05
Heckler, Thomas M.
Boots, shoes, and leggings
364DIG2, 3649244, 3649269, G06F 1520
Patent
active
053013476
ABSTRACT:
The controller is microprocessor based, and provides an interface between laboratory entrances and accompanying safety shutters to block the laser beam during a laboratory breach. The shutter controller comprises a microcomputer operating in a two data bus configuration. Communication to external safety devices is accomplished through three output ports and one input port. Interface cards signal the system that an action is to be taken. In operation, the controller performs a set of very specific tasks which form the controller algorithm. When the controller receives an interrupt indicating that the laboratory was breached, the controller directs that all shutters on all lasers are closed. Output ports serve as drivers for safety shutters, interlocks, and indicator lights to convey the status of the safety shutters. An input port accepts input data from an external driver that indicates the actual state of the shutters to determine if a shutter closure failure occurred. Interface to the shutter controller system is accomplished through the use of interface cards, which perform the dual function of signalling the system that an action is to be taken and indicating the specific nature of the requested action. The cards allow the user to control the shutters and/or interlocks of each laser connected to the system via the use of switches, remote controls and computer interfaces. It is through the use of the second data bus that these cards communicate with the microcomputer.
REFERENCES:
patent: 4415231 (1983-11-01), Kaczensky et al.
patent: 4663520 (1987-05-01), Tanaka et al.
patent: 4730113 (1988-03-01), Edwards et al.
patent: 4856874 (1989-08-01), Tusting
Franz Bernard E.
Heckler Thomas M.
Singer Donald J.
The United States of America as represented by the Secretary of
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