Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – With means to control the operation of the section
Patent
1984-04-30
1987-05-12
Spar, Robert J.
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
With means to control the operation of the section
198856, 192 9, 303 95, B65G 4300
Patent
active
046642471
ABSTRACT:
A transportation apparatus having improved brake control. The actual speed of the transportation apparatus is compared with a reference speed signal, and when the actual speed exceeds the reference speed a brake is applied to slow the transportation apparatus. Rather than simply applying the full torque of the brake abruptly, the present invention discloses an apparatus for pulse duration modulating the control signal for controlling the brake. The brake responds to the average of the pulse duration modulated control signal such that braking torque is applied gradually and essentially linearly. The device can also be used in an acceleration situation to provide gradual acceleration of the transportation apparatus.
REFERENCES:
patent: 3519805 (1970-07-01), Thorne-Booth
patent: 3985400 (1976-10-01), Iizuka et al.
patent: 4084859 (1978-04-01), Bull et al.
patent: 4231452 (1985-11-01), Kraft
Johnson Frederick O.
Kruper Andrew P.
Maiden Charles W.
Wolf Joachim E.
Dayoan D. Glenn
Lackey D. R.
Spar Robert J.
Westinghouse Electric Corp.
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