US3648619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stop for power and free conveyors
Assignee: Geo W King Ltd
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Filing: 1970-05-06
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Granted: 1972-03-14
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Expires: 1990-05-06
Abstract
Abstract A power and free conveyor has trolleys driven along a fixed track by abutments on the trolleys being engaged by dogs depending from an endless drive chain. At a station, a stop is spring-biassed into an operative position in which it depresses the abutment of a trolley out of the path of the dogs. A bellcrank lever has one arm which can be moved into that path. When a dog turns the one arm, the other arm retracts the stop, and the dog then moves the trolley from the station. Thereupon, the trolley releases a latch which holds the stop retracted, so that the stop returns to its operative position.
Inventors
- 👤 Keith Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:07
CPC Classifications
B; B61; B61B; B61B10/00; B61B10/02; B61B10/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
233 words
In a conveyor of the kind wherein load-carrying trolleys are propelled along a fixed track by virtue of the engagement with drive abutments on said trolleys of drive dogs which depend from an endless driven chain travelling along a path above said fixed track, the provision at a selected station along the conveyor path of a stop mechanism comprising a stop member, biassing means biassing said stop member to assume normally an operative position wherein it will be effective to depress the drive abutment on any load carrying trolley arriving at the station thereby to effect discontinuance of the drive to said trolley, a member which, when it is required to release the trolley from the station, is movable into the path of the drive dogs on the driven chain, the latter member being operative, when contacted by one of said dogs to cause retraction of the stop member from its operative position thereby to allow the drive abutment on the trolley to return to its operative position so that said trolley will then be driven from the station, latch means operative to lock the stop member in its retracted position, and means adapted to be actuated by the load trolley as it moves away from the station to effect release of the latch means so that said stop member will return under the action of its biassing means to its operative position.
Claim 2
Dependent Claim
233 words
In a conveyor of the kind wherein load-carrying trolleys are propelled along a fixed track by virtue of the engagement with drive abutments on said trolleys of drive dogs which depend from an endless driven chain travelling along a path above said fixed track, the provision at a selected station along the conveyor path of a stop mechanism comprising a stop member, biassing means biassing said stop member to assume normally an operative position wherein it will be effective to depress the drive abutment on any load carrying trolley arriving at the station thereby to effect discontinuance of the drive to said trolley, a member which, when it is required to release the trolley from the station, is movable into the path of the drive dogs on the driven chain, the latter member being operative, when contacted by one of said dogs to cause retraction of the stop member from its operative position thereby to allow the drive abutment on the trolley to return to its operative position so that said trolley will then be driven from the station, latch means operative to lock the stop member in its retracted position, and means adapted to be actuated by the load trolley as it moves away from the station to effect release of the latch means so that said stop member will return under the action of its biassing means to its operative position.
Claim 3
Dependent Claim
54 words
A stop mechanism as in claim 1 in which the stop member is supported for longitudinal sliding movement back and forth from and into its operative position wherein it extends transversely across the fixed track and into the path of the drive abutment on any approaching load trolley, said biassing means comprising a spring.
Claim 4
Dependent Claim
141 words
A stop mechanism as in claim 1 a pivoted abutment on the stop member, said abutment being biassed so as normally to assume an operative position, the member for causing retraction of said stop member comprising a bell crank lever which is mounted for angular movement about a fixed pivot and is urged into an inoperative position by means of a spring, the arrangement being such that on an initial angular movement of the lever from its inoperative position one arm thereof will be moved into the path of the dogs on the endless driven chain and contact of a dog with such arm will result in a reverse angular movement of the lever such as will cause the second arm thereof to cooperate with the abutment on the stop member thereby to move said stop member into its retracted position.
Claim 5
Dependent Claim
28 words
A stop mechanism as in claim 3 comprising a solenoid to effect initial angular movement of the bell crank lever as a result of energization of the solenoid.
Claim 6
Dependent Claim
99 words
A stop mechanism as in claim 1 in which the latch means comprise a spring-loaded plunger operative on retraction of the stop member to engage a recess in the latter, said plunger being coupled to an arm which is carried by a rotatable shaft also carrying a further arm arranged to project with the path of any load trolley driven from the station, the arrangement being such that contact of a trolley with the further arm will result in angular movement of the shaft and resultant retraction of the plunger from engagement with the recess in the stop member.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |