Patent US3918201A successfully refreshed from Google Patents.
US3918201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system for a sliding door
Assignee: Faiveley Transport SA
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Filing: 1974-07-12
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Granted: 1975-11-11
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Expires: 1994-07-12
Abstract
Abstract A sliding door is operated automatically by means of a nut and threaded rod which are driven by a reversible motor and constitute a reversible-action motion converter. The motor supply circuit comprises a switchable speed-reduction resistor, a protective resistor in series with the motor and a switchable voltage-limiter which can be connected in shunt across the motor terminals at the end of travel of the door-leaf.
Inventors
- 👤 Charles Graziano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:57
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/632; E05F15/652; E05F15/655; E05F11/00; E05F11/54; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/47; E05Y2201/474; E05Y2201/60; E05Y2201/622; E05Y2201/676; E05Y2400/00; E05Y2400/10; E05Y2400/30; E05Y2400/3013; E05Y2400/3017; E05Y2400/32; E05Y2400/33; E05Y2400/332; E05Y2400/52; E05Y2400/53; E05Y2400/54; E05Y2400/55; E05Y2400/552; E05Y2800/00; E05Y2800/20; E05Y2800/21; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; E05Y2900/50; E05Y2900/51
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
An automatic control system for a sliding-motion door having at least one leaf rigidly fixed to a nut associated with a threaded operating rod driven in rotation by a reversible electric motor associated with an elastic coupling system which is deformable in rotation, the supply circuit of the motor being provided with a first switch and a second switch, a speedreduction resistor which can be changed-over by means of the first switch controlled by the displacement of the door leaf, wherein the supply circuit of the motor includes a protective resistor permanently mounted in series with the motor, and a voltage limiter which can be changed-over by means of the second switch controlled by the displacement of the door leaf so as to connect the voltage limiter in shunt across the motor terminals at the end of travel of said door leaf, the values of the two resistors and the threshold values of the voltage limiter as well as the characteristics of the motor being so selected as to limit the current intensity in the motor, when said motor is at a standstill, at a sufficiently low value to maintain the normal operating voltage at the terminals of the motor supply circuit, said nut and said threaded operating rod moreover constituting a reversible-action motion converter.
Claim 2
Dependent Claim
215 words
An automatic control system for a sliding-motion door having at least one leaf rigidly fixed to a nut associated with a threaded operating rod driven in rotation by a reversible electric motor associated with an elastic coupling system which is deformable in rotation, the supply circuit of the motor being provided with a first switch and a second switch, a speedreduction resistor which can be changed-over by means of the first switch controlled by the displacement of the door leaf, wherein the supply circuit of the motor includes a protective resistor permanently mounted in series with the motor, and a voltage limiter which can be changed-over by means of the second switch controlled by the displacement of the door leaf so as to connect the voltage limiter in shunt across the motor terminals at the end of travel of said door leaf, the values of the two resistors and the threshold values of the voltage limiter as well as the characteristics of the motor being so selected as to limit the current intensity in the motor, when said motor is at a standstill, at a sufficiently low value to maintain the normal operating voltage at the terminals of the motor supply circuit, said nut and said threaded operating rod moreover constituting a reversible-action motion converter.
Claim 3
Dependent Claim
34 words
A system according to claim 1, including an emergency control for the hand operation of the door, Wherein said emergency control is associated with a cut-off switch on the supply line of the motor.
Claim 4
Dependent Claim
84 words
A system control according to claim 1, wherein said values of the resistors and of the voltage limiter, as well as the characteristics of said reversible-action motion convertor and of said motor are selected so as to ensure complete slowing-down and stopping of the motor under the action of the torque exerted on the operating rod, when said torque attains a predetermined value corresponding to a predetermined longitudinal force applied to the door leaf, said longitudinal force being consistent with the safety of users.
Claim 5
Dependent Claim
55 words
A system according to claim 3, wherein the operating rod has a diameter of 15 to 30 mm and a thread pitch of 60 to 120 mm, the deformation of the elastic coupling system corresponding substantially to one-quarter of a revolution of the operating rod for said predetermined longitudinal force applied to the door leaf.
Claim 6
Dependent Claim
71 words
A system according to claim 4, wherein said elastic coupling system comprises a cage containing a nut capable of sliding within the cage without rotating and an axial rod similar to said operating rod of the door, oppositely acting springs mounted between said cage and said sliding nut, said cage and said axial rod being respectively coupled to the shaft of said motor and to the operating rod of the door.
References Cited (Backward Citations)
US1282128A
Cited
US3104098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |