Patent US2190121A successfully refreshed from Google Patents.
US3807697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoist or the like
Assignee: QUINCY TECHNOLOGIES Inc A CORP OF DE
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Filing: 1972-10-12
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Granted: 1974-04-30
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Expires: 1992-10-12
Abstract
Abstract A compact electro-mechanical actuator is disclosed wherein a pair of coaxial winding drums, enclosing mechanism for oppositely and reversely driving them at equal but variable speeds, control a load-moving means such as a chain or cable. A loadholding braking mechanism is provided by the gearing employed. Also, the line of force acting between the load and the actuator passes through its center and hence exerts no torque tending to twist the cable or deflect the actuator but maintains the unit in dynamic balance. Relatively simple, light weight construction facilitates one-man or one-hand control, the limits of drum rotation being determined by a counting mechanism.
Inventors
- 👤 A Cotreau
- 👤 R Sayce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:25
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/18; B66D3/20; B66D3/22; B66D2700/00; B66D2700/02; B66D2700/026; Y; Y10; Y10S; Y10S254/00; Y10S254/901
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
In a hoist having a cable-winding drum rotatable about its axis by a stationary driving motor mounted within the drum, the cable having one end secured to the drum, an intermediate portion of the cable including turns wound on the drum, and another portion of the cable being coupled to a load, reducer mechanism coupling the motor to the drum and having high resistance to back-driving, and automatic mechanism for limiting the extent of rotation of the drum, said mechanism including between the motor and the drum a device operatively connected to the latter for predeterminedly stopping the drive of said motor.
Claim 2
Dependent Claim
102 words
In a hoist having a cable-winding drum rotatable about its axis by a stationary driving motor mounted within the drum, the cable having one end secured to the drum, an intermediate portion of the cable including turns wound on the drum, and another portion of the cable being coupled to a load, reducer mechanism coupling the motor to the drum and having high resistance to back-driving, and automatic mechanism for limiting the extent of rotation of the drum, said mechanism including between the motor and the drum a device operatively connected to the latter for predeterminedly stopping the drive of said motor.
Claim 3
Dependent Claim
121 words
In a hoist having a pair of coaxial, counter-rotatable cable-winding drums respectively driven from the coaxial shafts of a stationary electric motor mounted within the drums, the cable being secured at its ends to the drums and having a midportion freely extending therefrom for coupling to a load, a frame for holding the motor against relative rotation, control means for limiting the range of operating movement of said cable midportion, the control means including a limit switch for interrupting electrical connection of the motor to a source of energy, and a mechanism supported on the frame and operatively connected to one of the drums for actuating the limit switch when the cable midportion is a predetermined distance from the one drum.
Claim 4
Dependent Claim
121 words
In a hoist having a pair of coaxial, counter-rotatable cable-winding drums respectively driven from the coaxial shafts of a stationary electric motor mounted within the drums, the cable being secured at its ends to the drums and having a midportion freely extending therefrom for coupling to a load, a frame for holding the motor against relative rotation, control means for limiting the range of operating movement of said cable midportion, the control means including a limit switch for interrupting electrical connection of the motor to a source of energy, and a mechanism supported on the frame and operatively connected to one of the drums for actuating the limit switch when the cable midportion is a predetermined distance from the one drum.
Claim 5
Dependent Claim
155 words
A hoist comprising a hollow, stationary frame, an electric motor non-rotatably mounted in the frame and having a pair of drive shafts extending coaxially therein, a pair of winding drums coaxially mounted for counter rotation about the axis of said shafts, said drums being supported by bearing means carried by the frame, a length of load connectable cable in wound relation on the two drums, speed reducer gearing units driven by said shafts, respectively, one gear of each reducer unit being in driving relation with the adjacent drum, and another gear of each reducer unit meshing with and reacting on teeth formed outboard of the frame, one of the drums being operatively connected to a revolution counting mechanism, and a limit switch secured to the frame is actuatable by said mechanism for deenergizing the motor when the number of turns of cable on either of the drums approaches zero or they become nearly fully wound.
Claim 6
Dependent Claim
155 words
A hoist comprising a hollow, stationary frame, an electric motor non-rotatably mounted in the frame and having a pair of drive shafts extending coaxially therein, a pair of winding drums coaxially mounted for counter rotation about the axis of said shafts, said drums being supported by bearing means carried by the frame, a length of load connectable cable in wound relation on the two drums, speed reducer gearing units driven by said shafts, respectively, one gear of each reducer unit being in driving relation with the adjacent drum, and another gear of each reducer unit meshing with and reacting on teeth formed outboard of the frame, one of the drums being operatively connected to a revolution counting mechanism, and a limit switch secured to the frame is actuatable by said mechanism for deenergizing the motor when the number of turns of cable on either of the drums approaches zero or they become nearly fully wound.
References Cited (Backward Citations)
US2228072A
Cited
US3392926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |