US3899050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lining for brake shoes
Assignee: Textar GmbH
•
Filing: 1974-02-22
•
Granted: 1975-08-12
•
Expires: 1994-02-22
Abstract
Abstract The brake comprises a base plate having a friction lining on one surface thereof and an abrasive coating on the surface of the friction layer. The abrasive coating is designed to ''''break in'''' the rotating surface of a brake drum or disc, the thickness of the abrasive coating being only sufficient to accomplish this. The surface of the abrasive coating is irregular with interrupted rib-like projections to prevent the abrasive material from itself producing scratches in the rotating surface of the drum or disc. Once the abrasive coating has worn off, the friction lining operates in the normal manner frictionally contacting the drum or disc surface upon the application of pressure.
Inventors
- 👤 Wolf Savary
- 👤 Hartmut Soennecken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:19
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D65/00; F16D65/0037; F16D2069/002; F16D2069/004
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
179 words
A lining for brake shoes comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging an opposing relatively moving surface to brake said movement, and b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections being substantially parallel and discontinuous, each of said rib-like projections including a plurality of unequally spaced interruptions of varying length separated by unequally spaced humps, the humps of said plurality of rib-like projections being arranged such that there is at least one hump along any imaginary line extending in a direction transverse to said parallel rib-like projections, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
Claim 2
Dependent Claim
179 words
A lining for brake shoes comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging an opposing relatively moving surface to brake said movement, and b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections being substantially parallel and discontinuous, each of said rib-like projections including a plurality of unequally spaced interruptions of varying length separated by unequally spaced humps, the humps of said plurality of rib-like projections being arranged such that there is at least one hump along any imaginary line extending in a direction transverse to said parallel rib-like projections, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
Claim 3
Dependent Claim
50 words
A brake lining as defined in claim 1 wherein both said base layer and said coating have about the same friction value and temperature resistance to improve uniform wear of said coating and base layer and assure that any uneven wear will not affect the braking resistance of said lining.
Claim 4
Dependent Claim
22 words
A brake lining as defined in claim 2 wherein less than about 7 percent by weight of said binder decomposes at 500*C.
Claim 5
Dependent Claim
40 words
A brake lining as defined in claim 1 wherein said grinding material is selected from the grOup consisting of carborundum, corundum (Al2O3), ground pumice, silicon carbide (SiC), zirconium sand (ZrO2), powder glass, quartz (SiO2), chromic oxide (Cr2O3), and mixtures thereof.
Claim 6
Dependent Claim
39 words
A brake lining as defined in claim 1 wherein said binder is selected from the group consisting of phenol, cresol, xylenol, formaldehyde, cresol containing 4-15 percent by weight of hexamethylene tetramine, and xylenol containing 4-15 percent of hexamethylene tetramine.
Claim 7
Dependent Claim
27 words
A brake lining as defined in claim 1 wherein said abrasive composition comprises about 65-75 percent by weight grinding material and about 35-25 percent by weight binder.
Claim 8
Dependent Claim
41 words
A brake lining as defined in claim 1 wherein said particulate abrasive material has a particle size ranging between about 10 and 125 microns with the majority of said material having a particle size ranging between about 20 and 40 microns.
Claim 9
Dependent Claim
28 words
A brake lining as defined in claim 1 wherein the thermal stability of said coating is at least as great as the thermal stability of said base layer.
Claim 10
Dependent Claim
26 words
A brake lining as defined in claim 1 wherein the composition of said binders contained in said base layer and in said coating are the same.
Claim 11
Dependent Claim
21 words
A brake lining as defined in claim 1 wherein the thickness of said coating is between about 0.3 and 0.6 mm.
Claim 12
Dependent Claim
137 words
A lining for brake shoes comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging an opposing relatively moving surface to brake said movement, and b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface, having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections extending in a direction substantially perpendicular to the direction of movement of said opposing surface, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
Claim 13
Dependent Claim
137 words
A lining for brake shoes comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging an opposing relatively moving surface to brake said movement, and b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface, having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections extending in a direction substantially perpendicular to the direction of movement of said opposing surface, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
Claim 14
Dependent Claim
177 words
In combination, at least one brake shoe having a lining thereon and an adjacent element mounted for movement along a path and having an opposing relatively moving surface for engagement by said lining, said lining comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging said opposing relatively moving surface to brake said movement of said adjacent element, b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface, having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections extending in a direction substantially perpendicular to the direction of movement along said path of said opposing surface of said adjacent element, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
Claim 15
Dependent Claim
177 words
In combination, at least one brake shoe having a lining thereon and an adjacent element mounted for movement along a path and having an opposing relatively moving surface for engagement by said lining, said lining comprising a. a base layer comprising a filler and a binder for said filler for frictionally engaging said opposing relatively moving surface to brake said movement of said adjacent element, b. a coating on a surface of said base layer, said coating comprising a particulate abrasive material and a binder for said particulate abrasive material for initial grinding of said opposing relatively moving surface, c. said coating having a non-uniform thickness and the surface of said coating, for contacting said opposing relatively moving surface, having an undulating configuration with rib-like projections when viewed in cross section, said rib-like projections extending in a direction substantially perpendicular to the direction of movement along said path of said opposing surface of said adjacent element, to permit abrasive particles loosened from said coating to be discharged, preventing said loosened particles from scratching said relatively moving surface.
References Cited (Backward Citations)
US2136585A
Cited
US2201191A
Cited
US2322156A
Cited
US2784105A
Cited
US3406020A
Cited
US3523595A
Cited
US3547609A
Cited
US3655609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |