Patent US3853205A successfully refreshed from Google Patents.
US3853205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load accelerating and decelerating pulley means
Assignee: Task Corp
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Filing: 1972-03-16
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Granted: 1974-12-10
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Expires: 1992-03-16
Abstract
Abstract A lifting system, as for an elevator, provides speed control that is substantially mechanical rather than electrical in nature, with advancement in reliability. It comprises, in combination, A. A ROTARY DRIVE HAVING SUBSTANTIALLY CONSTANT OUTPUT SPEED, B. A PULLEY OPERATIVELY CONNECTED TO THE DRIVE TO BE ROTATED, THE PULLEY HAVING AN AXIS OF ROTATION, C. LOAD IMPOSING STRUCTURE TO BE DISPLACED BETWEEN SPACED REST POSITIONS, AND D. A FIRST LOAD TRANSMITTING LINE OPERATIVELY CONNECTED TO SAID STRUCTURE AND ALSO WOUND ABOUT THE PULLEY TO AN EXTENT CORRESPONDING TO TURNING THEREOF BY THE DRIVE, THERE BEING LOCI OF LINE DEPARTURE POINTS FROM THE PULLEY AND WHICH HAVE RADII FROM THE PULLEY AXIS THAT PROGRESSIVELY INCREASE AS THE PULLEY ROTATES IN CORRESPONDENCE TO INCREASED DISPLACEMENT OF THE STRUCTURE FROM A REST POSITION.
Inventors
- 👤 F Gindroz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
B; B66; B66B; B66B11/00; B66B11/04; B66B11/08; B66B1/00; B66B1/02; B66B5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
340 words
In a lifting system, the combination comprising a. a rotary drive having substantially constant output speed, b. a pulley operatively connected to the drive to be rotated, the pulley having an axis of rotation, c. load imposing structure to be displaced between spaced rest positions, d. a first load transmitting line operatively connected to said structure and also wound about the pulley to an extent corresponding to turning thereof by the drive, there being certain loci of line departure points from the pulley and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from a rest position at a first station, and there being other loci of line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at a second station, the pulley having its largest diameter line engaging portion between said certain and other loci of line departure points, e. there being a second load transmitting line operatively connected to said structure and pulley to unwind from the pulley as the first line winds on the pulley, there being certain loci of second line departure points from the pulley, and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from rest position at the first station, and other loci of second line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at the second station, the first and second lines extending generally oppositely from the structure and being in tension so that the lines resist uneven acceleration of the structure, and each of the first and second lines wrapping about the pulley over substantially the same axial length thereof including said largest diameter portion, said lines wrapping in interleaved relation in different grooves defined by the pulley.
Claim 2
Dependent Claim
340 words
In a lifting system, the combination comprising a. a rotary drive having substantially constant output speed, b. a pulley operatively connected to the drive to be rotated, the pulley having an axis of rotation, c. load imposing structure to be displaced between spaced rest positions, d. a first load transmitting line operatively connected to said structure and also wound about the pulley to an extent corresponding to turning thereof by the drive, there being certain loci of line departure points from the pulley and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from a rest position at a first station, and there being other loci of line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at a second station, the pulley having its largest diameter line engaging portion between said certain and other loci of line departure points, e. there being a second load transmitting line operatively connected to said structure and pulley to unwind from the pulley as the first line winds on the pulley, there being certain loci of second line departure points from the pulley, and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from rest position at the first station, and other loci of second line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at the second station, the first and second lines extending generally oppositely from the structure and being in tension so that the lines resist uneven acceleration of the structure, and each of the first and second lines wrapping about the pulley over substantially the same axial length thereof including said largest diameter portion, said lines wrapping in interleaved relation in different grooves defined by the pulley.
Claim 3
Dependent Claim
26 words
The combination of claim 2 wherein the pulley is grooved to define said loci associated with said line departure points, the grooves defining a double lead.
Claim 4
Dependent Claim
14 words
The combination of claim 1 wherein the drive comprises a constant speed electrical motor.
Claim 5
Dependent Claim
279 words
In a lifting system, the combination comprising a. a rotary drive having substantially constant output speed, b. a first pulley operatively connected to the drive to be rotated, the pulley having an axis of rotation, c. load imposing structure to be displaced between spaced rest positions, d. a first load transmitting line operatively connected to said structure and also wound about the pulley to an extent corresponding to turning thereof by the drive, there being certain loci of line departure points from the pulley and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from a rest position at a first station, and there being other loci of line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at a second station, the pulley having its largest diameter line engaging portion between said certain and other loci of line departure points, and e. a second pulley operatively connected to the drive to be rotated and having an axis of rotation, there being a third load transmitting line connected to said structure and wound about the second pulley to an extent corresponding to turning thereof by the drive, there being loci of third line departure points from the second pulley and which have radii from the pulley axis that increase progressively as the pulley rotates in correspondence to increased displacement of the structure from said first rest position, and thereafter decrease progressively as the second pulley rotates in correspondence to structure approach to rest position at the second station.
Claim 6
Dependent Claim
279 words
In a lifting system, the combination comprising a. a rotary drive having substantially constant output speed, b. a first pulley operatively connected to the drive to be rotated, the pulley having an axis of rotation, c. load imposing structure to be displaced between spaced rest positions, d. a first load transmitting line operatively connected to said structure and also wound about the pulley to an extent corresponding to turning thereof by the drive, there being certain loci of line departure points from the pulley and which have radii from the pulley axis that progressively increase as the pulley rotates in correspondence to increased displacement of the structure from a rest position at a first station, and there being other loci of line departure points from the pulley which have radii from the pulley axis that progressively decrease as the pulley rotates in correspondence to structure approach to rest position at a second station, the pulley having its largest diameter line engaging portion between said certain and other loci of line departure points, and e. a second pulley operatively connected to the drive to be rotated and having an axis of rotation, there being a third load transmitting line connected to said structure and wound about the second pulley to an extent corresponding to turning thereof by the drive, there being loci of third line departure points from the second pulley and which have radii from the pulley axis that increase progressively as the pulley rotates in correspondence to increased displacement of the structure from said first rest position, and thereafter decrease progressively as the second pulley rotates in correspondence to structure approach to rest position at the second station.
Claim 7
Dependent Claim
49 words
The combination of claim 4 wherein said load imposing structure includes a mass and a load sharing element pivotally connected to said mass, the first and third lines being connected to said element at spaced locations relative to the pivotal connection such that the load transmitted thereby is shared.
Claim 8
Dependent Claim
36 words
The combination of claim 5 wherein said mass comprises an elevator cage in an aircraft, said first and third lines extending upwardly from said equalizer element, and said second line extending downwardly relative to said element.
Claim 9
Dependent Claim
22 words
The combination of claim 6 including a downhaul part pivotally connected to said mass, said second line operatively connected to said part.
Claim 10
Dependent Claim
18 words
The combination of claim 7 including means yieldably cushioning the connection of said second line to said part.
Claim 11
Dependent Claim
20 words
The combination of claim 7 including auxiliary cable and drive means manually operable in an emergency to lower the cage.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |