Patent US3661246A successfully refreshed from Google Patents.
US3661246A
Expired / Lapsed
US
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Training idler
Assignee: Hewitt Robins Inc
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Filing: 1970-03-26
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Granted: 1972-05-09
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Expires: 1990-03-26
Abstract
Abstract A skewing, rigid urethane spiral training idler and method of forming the same wherein the idler has right and left hand threads with continuous helical lands extending from the ends of the roll to the center of the roll where the threads merge and terminate. The training idler is pivotally mounted on a bearing in such a manner that the idler automatically skews to produce a training effect when a belt starts to detrain. For any longitudinal cross-sectional normal to a first plane that includes the longitudinal centerline of the idler, the sidewalls of the threads are substantially normal to the plane with a sight positive draft and as a result of this configuration the roots of the threads are offset with respect to each other at this plane even though the thread lands are continuous spirals. The idler roll is cast by injecting urethane compound between a pair of mold sections having their parting line coincident with the plane and an internal steel tube coated with a bonding agent. Due to the unique thread configuration relative to the mold parting line, the mold halfs are readily separated from the idler once the initial curing operation is completed even though the idler has the left-and right-hand threads thereon.
Inventors
- 👤 Stuart F Faunce
- 👤 William E Stout
- 👤 Harold W Koehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:12
CPC Classifications
B; B65; B65G; B65G39/00; B65G39/02; B65G39/07; B65G39/071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
An idler roll comprising: a. a cylindrical roll; b. first and second thread means formed on said cylindrical roll; c. said first thread means having first land means; d. said second thread means having second land means; e. said first land means being a right-hand helix extending from a first end of said roll; f. said second land means being a left-hand helix extending from a second end of said roll; g. said first and second land means merging and terminating at substantially the center of said Roll; h. said first and said second land means having side edges; i. said side edges being substantially continuous for the lengths of their respective helices; j. said first and second thread means having sidewalls; k. said sidewalls for each of said first and second thread means being formed by a plurality of discontinuous side surfaces contoured so that said side walls join said first and second land means at said side edges while at the same time extending substantially perpendicular to a predetermined plane which encompasses the longitudinal centerline of said cylindrical roll.
Claim 2
Dependent Claim
181 words
An idler roll comprising: a. a cylindrical roll; b. first and second thread means formed on said cylindrical roll; c. said first thread means having first land means; d. said second thread means having second land means; e. said first land means being a right-hand helix extending from a first end of said roll; f. said second land means being a left-hand helix extending from a second end of said roll; g. said first and second land means merging and terminating at substantially the center of said Roll; h. said first and said second land means having side edges; i. said side edges being substantially continuous for the lengths of their respective helices; j. said first and second thread means having sidewalls; k. said sidewalls for each of said first and second thread means being formed by a plurality of discontinuous side surfaces contoured so that said side walls join said first and second land means at said side edges while at the same time extending substantially perpendicular to a predetermined plane which encompasses the longitudinal centerline of said cylindrical roll.
Claim 3
Dependent Claim
20 words
The idler roll of claim 1 wherein said side surfaces form shoulders offset from each other in said predetermined plane.
Claim 4
Dependent Claim
25 words
The idler roll of claim 1 wherein said sidewalls of said first and second thread means having only positive drafts relative to said first plane.
Claim 5
Dependent Claim
19 words
The idler roll of claim 1 wherein each of said land means being continuous and of substantially constant width.
Claim 6
Dependent Claim
12 words
The idler roll of claim 1 wherein said thread means being non-metallic.
Claim 7
Dependent Claim
40 words
The idler roll of claim 1 wherein said cylindrical roll being mounted on a skewing means to permit angular adjustment of said roll relative to the normal direction of travel of a belt in response to detraining of the belt.
Claim 8
Dependent Claim
164 words
An idler roll comprising: a cylindrical roll, said cylindrical roll having first and second urethane thread means thereon for training a belt, said first thread means having first continuous land means of substantially constant width, said second thread means having second continuous land means of substantially constant width, said first land means being a right-hand helix extending from a first end of said roll, said second land means being a left-hand helix extending from a second end of said roll, said first and second land means merging and terminating at substantially the center of said roll, said first and second thread means having sidewalls, said sidewalls being perpendicular only, with respect to a predetermined plane which encompasses the longitudinal centerline of said cylindrical roll, and each of said thread means comprising first and second segments which abut at said predetermined plane with root portions of said first and second segments being offset with respect to each other at said predetermined plane and forming shoulders.
Claim 9
Dependent Claim
164 words
An idler roll comprising: a cylindrical roll, said cylindrical roll having first and second urethane thread means thereon for training a belt, said first thread means having first continuous land means of substantially constant width, said second thread means having second continuous land means of substantially constant width, said first land means being a right-hand helix extending from a first end of said roll, said second land means being a left-hand helix extending from a second end of said roll, said first and second land means merging and terminating at substantially the center of said roll, said first and second thread means having sidewalls, said sidewalls being perpendicular only, with respect to a predetermined plane which encompasses the longitudinal centerline of said cylindrical roll, and each of said thread means comprising first and second segments which abut at said predetermined plane with root portions of said first and second segments being offset with respect to each other at said predetermined plane and forming shoulders.
Claim 10
Dependent Claim
40 words
In the idler roll of claim 7: said cylindrical roll being mounted on a skewing means to permit angular adjustment of said roll relative to the normal direction of travel of a belt in response to detraining of the belt.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |