US3556484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerial tramway power and control means
Assignee: Individual
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Filing: 1968-06-10
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Granted: 1971-01-19
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Expires: 1988-06-10
Abstract
Abstract The invention has primary use in connection with aerial tramways, where a traveling carriage is supported by a cable having its end portions supported, respectively, at a head station and a remotely disposed tail station. First and second motors are designed or arranged in paired relation so that the movements of their yokes in a given direction will increase the torque of the first motor and decrease the torque of the second motor and movements of their yokes in the opposite direction will decrease the torque of the first motor and increase the torque of the second motor. Link means are provided interconnecting the yokes of said two motors so that the yokes move simultaneously. Lever means are connected with said link means for determining the position of said link means. The said first and second motors exert thrust in opposite directions on the carriage and the direction of travel of the carriage, depends on the one motor then having the greater torque, which functions to provide tension to tow or retrieve the carriage, and the other motor functions to provide countertension or drag.
Inventors
- 👤 Walter H Moller
- 👤 Joseph H Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:59
CPC Classifications
B; B63; B63B; B63B27/00; B63B27/18; Y; Y10; Y10S; Y10S60/00; Y10S60/905
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
197 words
A first variable displacement hydraulic motor having a first movable yoke controlling the output torque thereof, said first yoke when angularly moved in a first direction increasing the output torque of said first motor and when angularly moved in the reverse direction decreasing the output torque of said first motor; a second variable displacement hydraulic motor having a second movable yoke controlling the output torque thereof, said second yoke when angularly moved the said first direction decreasing the output torque of said second motor and when angularly moved in the reverse direction increasing the output torque of said second motor; link means interconnecting said two yokes for simultaneous angular movement in the same direction; control means determining the position of said link means; a first cable drum connected with and driven by said first motor; a second cable drum connected with and driven by said second motor; a cable reeved about said first drum, extending to said second drum, and reeved about said second drum; and with said motors arranged so said first motor exerts a force in one direction on said cable and the second motor exerts a force on said cable in the opposite direction.
Claim 2
Dependent Claim
197 words
A first variable displacement hydraulic motor having a first movable yoke controlling the output torque thereof, said first yoke when angularly moved in a first direction increasing the output torque of said first motor and when angularly moved in the reverse direction decreasing the output torque of said first motor; a second variable displacement hydraulic motor having a second movable yoke controlling the output torque thereof, said second yoke when angularly moved the said first direction decreasing the output torque of said second motor and when angularly moved in the reverse direction increasing the output torque of said second motor; link means interconnecting said two yokes for simultaneous angular movement in the same direction; control means determining the position of said link means; a first cable drum connected with and driven by said first motor; a second cable drum connected with and driven by said second motor; a cable reeved about said first drum, extending to said second drum, and reeved about said second drum; and with said motors arranged so said first motor exerts a force in one direction on said cable and the second motor exerts a force on said cable in the opposite direction.
Claim 3
Dependent Claim
22 words
The combination of claim 1 wherein said first and second motors are each separately connected to a common source of hydraulic pressure.
Claim 4
Dependent Claim
69 words
The combination of claim 2 wherein said connection of said motors to a common source of hydraulic pressure comprises high-pressure conduits connecting said first and second motors to a common source of hydraulic fluid under pressure, and low-pressure conduits connecting said first and second motors to a common conduit, thus if either of said motors is reversed in fluid pressure output, the same is delivered to the other thereof.
Claim 5
Dependent Claim
56 words
The combination of claim 2 wherein said common source of hydraulic fluid under pressure is a variable displacement hydraulic motor-pump having an overcenter movable yoke and functions as a motor when the yoke thereof is disposed from one side of center and as a pump when said yoke is disposed from the other side of center.
Claim 6
Dependent Claim
26 words
The combination of claim 2 wherein said source of hydraulic fluid under pressure is a variable displacement hydraulic motor-pump which is powered by an electric motor.
Claim 7
Dependent Claim
42 words
The combination of claim 4 wherein a hydraulic actuated piston means is connected with said yoke of the hydraulic motor-pump and the position of the hydraulic actuated piston means is controlled by the hydraulic pressure of said comMon source of hydraulic pressure.
Claim 8
Dependent Claim
110 words
The combination of claim 6 wherein a sliding spool valve having three positions is disposed between a conduit from said common source of hydraulic pressure to said hydraulic actuated piston means and a discharge reservoir, said three spool positions comprising a first position providing connections between said conduit and one side of said piston means and between the other said piston means and said discharge reservoir; a second position blocking connections between said conduit and said discharge reservoir; and a third position providing a connection between said conduit and the other side of said piston means and between the said one side of said piston means and said discharge reservoir.
Claim 9
Dependent Claim
35 words
The combination of claim 7 wherein said sliding spool valve is spring loaded and urged by the spring means thereof in a direction counter to that it is urged by common source of hydraulic pressure.
Claim 10
Dependent Claim
53 words
The combination of claim 8 wherein the sliding spool valve has its second position in blocking position between said conduit to the common source of hydraulic pressure and said discharge reservoir when the spring pressure against said sliding spool valve is in balance with the pressure from said common source of hydraulic pressure.
Claim 11
Dependent Claim
40 words
The combination of claim 9 wherein deadband springs of predetermined force are provided in the sliding spool valve assembly to set a predetermined force differential which must be overcome to shift the sliding spool vaLve from its said second position.
Claim 12
Dependent Claim
21 words
The combination of claim 10 wherein an accumulator is used to cushion pressure surges from the common source of hydraulic pressure.
Claim 13
Dependent Claim
26 words
The combination of claim 11 wherein an accumulator functions as a hydraulic power source as the movable yoke of motor-pump passes through the no-flow center position.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |