US3851752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-troughed conveyor belt reversing apparatus and method
Assignee: Joy Manufacturing Co
•
Filing: 1973-05-03
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Granted: 1974-12-03
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Expires: 1993-05-03
Abstract
Abstract A method and apparatus for reversing a transversely flexible, self-troughed belt by using a crowned pulley to reduce the side height of the troughed belt while in contact with the crowned pulley resulting in a reduced vertical dimension of the conveyor belt reversing terminal compared to prior art reversing terminals for such a belt.
Inventors
- 👤 N Densmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:08
CPC Classifications
B; B65; B65G; B65G23/00; B65G23/02; B65G23/04; E; E21; E21F; E21F13/00; E21F13/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
In a transfer terminal for a mobile belt conveyor having a transversely flexible self-troughed conveyor belt with a horizontal base portion and obliquely raised side portions producing a given side height, the improvement comprising: a belt reversing pulley means having an effective pulley length substantially equal to the width of said belt base portion; said pulley means forming a crowned pulley assembly with a ratio of effective crown radius to pulley major diameter no greater than about four to one; said crowned pulley being cooperable with said belt to substantially reduce the side height from said given height while said belt is in contact with said pulley means.
Claim 2
Dependent Claim
108 words
In a transfer terminal for a mobile belt conveyor having a transversely flexible self-troughed conveyor belt with a horizontal base portion and obliquely raised side portions producing a given side height, the improvement comprising: a belt reversing pulley means having an effective pulley length substantially equal to the width of said belt base portion; said pulley means forming a crowned pulley assembly with a ratio of effective crown radius to pulley major diameter no greater than about four to one; said crowned pulley being cooperable with said belt to substantially reduce the side height from said given height while said belt is in contact with said pulley means.
Claim 3
Dependent Claim
27 words
In a transfer terminal as specified in claim 1 the further improvement wherein; said pulley means includes a metallic core pulley and a pulley surface rubber covering.
Claim 4
Dependent Claim
56 words
A transfer terminal as specified in claim 2 wherein said rubber covering is present only on the central surface portion and is of a thickness to produce in conjunction with the end surfaces of said crowned pulley a ratio of effective crown radius of curvature to major pulley diameter no greater than about four to one.
Claim 5
Dependent Claim
42 words
A transfer terminal as specified in claim 1 wherein said pulley means comprises a central pulley mounted on a supporting shaft and two smaller diameter end pulleys axially equally spaced from respective ends of said central pulley and mounted on said shaft.
Claim 6
Dependent Claim
30 words
A transfer terminal as specified in claim 4 wherein said central pulley is keyed to said shaft and said end pulleys are free to rotate with respect to said shaft.
Claim 7
Dependent Claim
17 words
A transfer terminal as specified in claim 1 wherein said pulley means has a low friction surface.
Claim 8
Dependent Claim
83 words
A transfer terminal as specified in claim 1 addiTionally comprising a support frame for said reversing pulley means, a wheeled mobile support unit pivotally supporting said frame, said support unit having a set of wheel elements on each side thereof, drive means drivingly connecting all of the wheels of a given set of said wheels to provide synchronized rotation of said wheels of said given set, steering of said mobile support unit being accomplished by speed variation between the two sets of wheels.
Claim 9
Independent Claim
47 words
A method of reversing a transversely flexible self-troughed conveyor belt having a base portion and a given side height comprising the step of training such a belt about a crowned pulley means to reduce said side height from said given height to less than 75 percent thereof.
Claim 10
Independent Claim
47 words
A method of reversing a transversely flexible self-troughed conveyor belt having a base portion and a given side height comprising the step of training such a belt about a crowned pulley means to reduce said side height from said given height to less than 75 percent thereof.
Claim 11
Dependent Claim
51 words
A method as set forth in claim 8 comprising the additional steps of training said belt through idler sets in troughed condition before said training about said crowned pulley and subsequently passing the inner surface of the base portion of said belt over a snubbing pulley to reform said side height.
Claim 12
Dependent Claim
29 words
A method as set forth in claim 9 wherein said snubbing pulley step assures belt contact with the crowned pulley means for at least 60 percent of its circumference.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |