Boots – shoes – and leggings
Patent
1989-08-21
1991-07-09
Lall, Parshotam S.
Boots, shoes, and leggings
364550, 364183, 361 1, 324537, G05B 2102
Patent
active
050311107
ABSTRACT:
A microcomputer repetitively samples a signal representative of the instantaneous state of an electrical contact and initiates a count in response to the first sample which indicates a contact state different from a stored status of the contact. The microprocessor counts up for samples indicating an active state of the contact and down for inactive samples. If the count increases to a predetermined count representing a certain net count of active samples when the stored status is inactive, the stored status is changed to active. Similarly, the stored status is changed from active to inactive if the count decreases to a predetermined count representing a certain net count of inactive samples. The time of the first sample which indicates a contact state different from the stored status of the contact is stored as a temporary time. If the stored contact status is changed, the stored temporary time is saved as the valid time of the change in status. The microcomputer maintains lists of contacts having an active status and those having an inactive status and keeps track of a separate sample count for each contact monitored.
REFERENCES:
patent: 4636967 (1987-01-01), Bhatt et al.
patent: 4845475 (1989-07-01), Cooledge et al.
patent: 4885676 (1989-12-01), Zewighaft
patent: 4937763 (1990-06-01), Mott
patent: 4964058 (1990-10-01), Brown, Jr.
ABB Power T&D Company Inc.
Lall Parshotam S.
Mattson Brian M.
Westerhoff Richard V.
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