US4164280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller conveyor
Assignee: Mannesmann Demag AG
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Filing: 1978-03-31
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Granted: 1979-08-14
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Expires: 1998-03-31
Abstract
Abstract A hesitation device is provided in a material conveying roller conveyor system which is simple and inexpensive in construction, while at the same time allows accumulation of conveyed materials with any damaging or disturbing effect upon the conveyed material. This is achieved by providing unbalancing weights in the rollers of the conveyor in the stoppage or hesitation area in combination with a driving belt for the rollers having areas of differing coefficients of friction.
Inventors
- 👤 Walter Duttine
- 👤 Helmut Kratz
- 👤 Harald Bosch
- 👤 Gerhard Steigerwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:08
CPC Classifications
B; B65; B65G; B65G47/00; B65G47/22; B65G47/26; B65G47/261
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A material hesitation system for a roller conveyor line, comprising (a) a plurality of spaced rollers defining a hesitation area; (b) an endless drive belt frictionally engaging said plurality of rollers; the improvement characterized by (c) an unbalancing weight disposed in each of said plurality of rollers adjacent the periphery thereof; (d) the surface of said drive belt facing said rollers having alternating areas of high and low coefficients of friction; (e) the power transferred from said low frictional coefficient areas to said rollers being below that required for the return momentum of said unbalancing weights, but sufficient to maintain momentum of already revolving rollers; and (f) the power transferred from said high frictional characteristic areas being greater than the return momentum of said unbalancing weights.
Claim 2
Dependent Claim
126 words
A material hesitation system for a roller conveyor line, comprising (a) a plurality of spaced rollers defining a hesitation area; (b) an endless drive belt frictionally engaging said plurality of rollers; the improvement characterized by (c) an unbalancing weight disposed in each of said plurality of rollers adjacent the periphery thereof; (d) the surface of said drive belt facing said rollers having alternating areas of high and low coefficients of friction; (e) the power transferred from said low frictional coefficient areas to said rollers being below that required for the return momentum of said unbalancing weights, but sufficient to maintain momentum of already revolving rollers; and (f) the power transferred from said high frictional characteristic areas being greater than the return momentum of said unbalancing weights.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1, further characterized by (a) a plurality of movable contact rollers positioned on the side of said drive belt opposite said plurality of conveyor rollers for pressing said belt against said conveyor rollers.
Claim 4
Dependent Claim
20 words
The apparatus of claim 2, further characterized by (a) said contact rollers positioned along said belt between said conveyor rollers.
Claim 5
Dependent Claim
21 words
The apparatus of claim 2, further characterized by (a) the contact power of said contact rollers against said belt is controlled.
Claim 6
Dependent Claim
30 words
The apparatus of claim 2, further characterized by (a) each said contact roller mounted on a pivotal lever; and (b) each said lever is spring biased toward said drive belt.
Claim 7
Dependent Claim
19 words
The apparatus of claim 5, further characterized by (a) said spring bias of each said contact lever is adjustable.
Claim 8
Dependent Claim
38 words
The apparatus of claim 1, further characterized by (a) the distance between two areas of high coefficient of friction is substantially the same as the length of the hesitation area of said system in a roller conveyor line.
References Cited (Backward Citations)
US1366966A
Cited
US3266617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |