US3601246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-speed drive system
Assignee: Regie Autonome des Transports Parisiens
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Filing: 1969-07-18
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Granted: 1971-08-24
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Expires: 1989-07-18
Abstract
Abstract A variable-speed drive system comprising at least one device movable along a guide path, wherein a rotating drive member is provided which is rotated at a constant speed and rolls on a bearing surface associated with said guide path. Means are provided to vary the rolling radius of the rotating member on the bearing surface in dependence upon the position of the moving device along the guide path so that the linear speed of said device may vary according to a predetermined law. The rotating member may be a pulley having a slidable flange and associated with a constant width bearing surface or a one-piece pulley associated with a variable section bearing surface.
Inventors
- 👤 Jacques Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
CPC Classifications
B; B65; B65G; B65G23/00; B65G2811/00; B65G2811/09; B65G2811/095; B65G2811/096
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device is a pulley having a fixed flange and a flange which can slide along the pulley axis of rotation and which is resiliently restored towards the fixed flange; and the bearing surface associated with the pulley is dispOsed at a variable distance from the pulley axis but is of uniform width.
Claim 2
Dependent Claim
46 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device is a one-piece pulley having flared flanges; and the bearing surface is of variable width, means being provided to engage the pulley with such surface along the path.
Claim 3
Dependent Claim
29 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device is formed with a groove whose shape comprises two straight segments.
Claim 4
Dependent Claim
29 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device is formed with a groove whose shape comprises two curvilinear segments.
Claim 5
Dependent Claim
53 words
A system as set forth in claim 1, characterized in that the moving device comprises a roller-fitted slide, and the guide path comprises two parallel rails on which the rollers bear, the slide bearing a yoke which is disposed between the two rails and which receives the rotating member driving the moving device.
Claim 6
Dependent Claim
45 words
A system as set forth in claim 6, characterized in that the guide path rails are borne by spaced uprights which also bear support members for the bearing surface, means also being provided to adjust the distance between the last-mentioned surface and the support member.
Claim 7
Dependent Claim
33 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device has a gearwheel which meshes with a driving linktype chain disposed along the guide path.
Claim 8
Dependent Claim
25 words
A system as set forth in claim 1, characterized in that the rotating member driving the moving device is driven by a motor disposed thereon.
Claim 9
Dependent Claim
26 words
A system as set forth in claim 8, characterized in that it comprises a number of moving devices whose gearwheels mesh with the same driving chain.
Claim 10
Dependent Claim
49 words
A system as set forth in claim 1, characterized in that it is used to form a handrail for a variable-speed travelator, the system comprising a number of moving devices disposed on the same endless guide path, the various moving devices being interconnected by extensible members such as bellows.
Claim 11
Dependent Claim
31 words
A system as set forth in claim 1, characterized in that it comprises a number of devices movable along the same guide path and forming the elements of a variable-speed conveyor.
Claim 12
Dependent Claim
35 words
A system as set forth in claim 1, characterized in that it is associated with a similar system disposed parallel to it, the moving devices being interconnected by transverse members which act as support members.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |