Patent US4034272A successfully refreshed from Google Patents.
US4034272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving screen arrangement
Assignee: Individual
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Filing: 1975-07-07
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Granted: 1977-07-05
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Expires: 1995-07-07
Abstract
Abstract A moving screen display device includes a display web supported on a pair of reels, and a reversible motor to drive each reel. The motors are selectively driven so that if one motor is driving one reel in a take-up direction, the other motor is driven in the same direction at a reduced voltage to relieve stress on its drive train. To stop the web at a desired display position, the driving motor is deenergized, and the other motor is simultaneously driven for a few seconds in a reverse direction at a reduced voltage to counteract the momentum of the system.
Inventors
- 👤 John M. Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:19
CPC Classifications
G; G09; G09F; G09F11/00; G09F11/24; G09F11/29; G09F11/295
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
190 words
A web transport system comprising a pair of reels for supporting, storing and displaying a web therebetween, a pair of reversible electric motors each operatively connected to one of said reels, relay means including a pair of relays for applying a first voltage to one of said motors to drive said one motor in a first rotational direction, and for applying a second, reduced voltage to the other of said motors to torque bias said other motor in said first rotational direction, and stopping means for applying a third, reduced voltage to said one motor to drive said one motor in said first direction while applying said first voltage in reverse fashion to said other motor to drive said other motor counter to said first direction and stop said reels, said stopping means including a manual switch and a time delay relay, said manual switch including a neutral, non-actuating position, a first position for actuating said relay means to apply said first and second voltages to said motors, and a second position for actuating said time delay relay and said relay means to apply said third voltage to said motors.
Claim 2
Dependent Claim
190 words
A web transport system comprising a pair of reels for supporting, storing and displaying a web therebetween, a pair of reversible electric motors each operatively connected to one of said reels, relay means including a pair of relays for applying a first voltage to one of said motors to drive said one motor in a first rotational direction, and for applying a second, reduced voltage to the other of said motors to torque bias said other motor in said first rotational direction, and stopping means for applying a third, reduced voltage to said one motor to drive said one motor in said first direction while applying said first voltage in reverse fashion to said other motor to drive said other motor counter to said first direction and stop said reels, said stopping means including a manual switch and a time delay relay, said manual switch including a neutral, non-actuating position, a first position for actuating said relay means to apply said first and second voltages to said motors, and a second position for actuating said time delay relay and said relay means to apply said third voltage to said motors.
Claim 3
Dependent Claim
47 words
The web transport system of claim 1, wherein said time delay relay remains actuated for a brief period after said switch is returned to said neutral position from said first or second positions to maintain application of said third voltage to said motors and stop said system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |