US4151900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake assembly for a rotatable shaft
Assignee: Glad Products Co
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Filing: 1977-11-30
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Granted: 1979-05-01
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Expires: 1997-11-30
Abstract
Abstract A brake assembly for maintaining uniform tension in plastic sheet material being unwound from a supply roll supported on a rotatable shaft. The brake assembly includes a pair of rollers which rotatably support the shaft. One roller is vertically displaceable relative to the other for controlling the movement of a linkage connected to a brake shoe in contact with the shaft. The surface area of brake lining in contact with the shaft is reduced in a proportion relative to the depletion of material from the supply roll.
Inventors
- 👤 Gary R. Kirwan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:42
CPC Classifications
B; B65; B65H; B65H59/00; B65H59/02; B65H59/04; B65H59/043; B65H59/046; F; F16; F16D; F16D49/00; F16D59/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A brake assembly for applying a braking force to a rotating shaft with the magnitude of the braking force being proportional to a variable weight supported by the shaft, said brake assembly comprising, in combination; a frame; a pair of rollers for supporting said shaft, said rollers being laterally separated from one another and mounted upon said frame in rotatable engagement with one end of said shaft; means for adjusting the vertical height of one of said rollers relative to the other in response to a change in the weight of said shaft; a brake shoe having a circular brake lining; means for urging said brake shoe into engagement with said shaft; and means responsive to the vertical displacement between said rollers for moving said brake shoe relative to said shaft such that the amount of surface friction area of said brake lining engaging said shaft varies with the weight of said shaft.
Claim 2
Dependent Claim
153 words
A brake assembly for applying a braking force to a rotating shaft with the magnitude of the braking force being proportional to a variable weight supported by the shaft, said brake assembly comprising, in combination; a frame; a pair of rollers for supporting said shaft, said rollers being laterally separated from one another and mounted upon said frame in rotatable engagement with one end of said shaft; means for adjusting the vertical height of one of said rollers relative to the other in response to a change in the weight of said shaft; a brake shoe having a circular brake lining; means for urging said brake shoe into engagement with said shaft; and means responsive to the vertical displacement between said rollers for moving said brake shoe relative to said shaft such that the amount of surface friction area of said brake lining engaging said shaft varies with the weight of said shaft.
Claim 3
Dependent Claim
25 words
A brake assembly as defined in claim 1 wherein said circular brake lining circumscribes an arc having an included angle of above at least 180°.
Claim 4
Dependent Claim
41 words
A brake assembly as defined in claim 2 wherein each roller is rotatably mounted in a separate yoke member with an axis of rotation disposed in substantial parallel alignment relative to one another and to the longitudinal axis of said shaft.
Claim 5
Dependent Claim
50 words
A brake assembly as defined in claim 3 wherein a predetermined first one of said yoke members is movable along a vertical axis for adjusting the vertical height of one roller relative to the other and further comprising a compression spring located between the first yoke member and said frame.
Claim 6
Dependent Claim
103 words
A brake assembly as defined in claim 4 wherein said means for moving said brake shoe relative to said shaft comprises; a brake rod; means for pivotally connecting a first side of said brake shoe to said brake rod; means for linking said brake rod to said first yoke member such that said brake rod moves vertically in response to vertical movement of said first yoke member; and means for coupling a second side of said brake shoe, opposite said first side, to said frame so as to permit laterally shifting of said brake shoe in response to said vertical displacement between rollers.
Claim 7
Dependent Claim
22 words
A brake assembly as defined in claim 5 wherein said brake lining has a coefficient of friction of above at least .40.
Claim 8
Dependent Claim
22 words
A brake assembly as defined in claim 4 wherein said brake lining has a coefficient of friction of above at least 0.40.
Claim 9
Dependent Claim
20 words
A brake assembly as defined in claim 7 wherein said brake lining is composed of a steel impregnated asbestos composition.
References Cited (Backward Citations)
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |