US3744595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle drum brakes
Assignee: Girling Ltd
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Filing: 1971-08-12
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Granted: 1973-07-10
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Expires: 1991-08-12
Abstract
Abstract An abutment assembly for interconnecting the ends of two brake shoes of a vehicle drum brake, the other ends of the shoes being connected to actuating means, comprising an elastically deformable member confined between piston-like portions of two tappets coupled to the respective shoes, these pistons having different areas of engagement with the elastic member so that only a part of the thrust applied to the assembly by one brake shoe is transmitted to the other shoe. The invention provides improved shaping of the elastic member; sealing means between the elastic member and the pistons; means for adjusting the length of the tappets to compensate for wear; and means for effecting such adjustment automatically.
Inventors
- 👤 W Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:55
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/04; F16D65/08; F16D65/09; F16D65/38; F16D65/40; F16D65/42; F16D65/46
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
In a vehicle drum brake including a back plate, actuator means mounted on the back plate, and a pair of brake shoes each having one of its ends connected to the actuator means, an abutment assembly connected between the other ends of the brake shoes, said assembly comprising; means mounted on the back plate defining at least one chamber open at both ends, said chamber having two end portions each of uniform cross-section, one larger than the other, and an intermediate portion interconnecting the two end portions and progressively decreasing in cross-section from the larger to the smaller, two piston members respectively engaged in the two end portions of the chamber, elastomeric material filling the chamber between the piston members and occupying at least said intermediate portion thereof and a part of the larger end portion thereof, and respective tappets coupling said pistons to said other ends of the two brake shoes.
Claim 2
Dependent Claim
152 words
In a vehicle drum brake including a back plate, actuator means mounted on the back plate, and a pair of brake shoes each having one of its ends connected to the actuator means, an abutment assembly connected between the other ends of the brake shoes, said assembly comprising; means mounted on the back plate defining at least one chamber open at both ends, said chamber having two end portions each of uniform cross-section, one larger than the other, and an intermediate portion interconnecting the two end portions and progressively decreasing in cross-section from the larger to the smaller, two piston members respectively engaged in the two end portions of the chamber, elastomeric material filling the chamber between the piston members and occupying at least said intermediate portion thereof and a part of the larger end portion thereof, and respective tappets coupling said pistons to said other ends of the two brake shoes.
Claim 3
Dependent Claim
78 words
An assembly according to claim 1, wherein the elastically deformable member has two end portions, each of uniform cross section but one larger than the other, and an intermediate portion of tapering cross section, the deformable member being confined within a correspondingly shaped cavity in a body member which can move only in a direction opposite to the direction of taper, between the pistons, whose cross sections are respectively equal to the two ends of the deformable member.
Claim 4
Dependent Claim
47 words
An assembly according to claim 2, wherein two such elastically deformable members and their respective body members are arranged with their larger ends together, and engaged by a common piston, the smaller ends of the deformable members being engaged by pistons forming parts of the reSpective tappets.
Claim 5
Dependent Claim
48 words
An assembly according to claim 2, wherein two such deformable members have their larger ends united to form a single member confined between two body members, each movable only towards the other, the ends of the deformable member being engaged by pistons forming parts of the respective tappets.
Claim 6
Dependent Claim
162 words
In a vehicle drum brake including a back plate, actuator means mounted on the back plate, and a pair of brake shoes each having one of its ends connected to the actuator means, an abutment assembly connected between the other ends of the brake shoes, said assembly comprising; means mounted on the back plate defining at least one chamber open at both ends, said chamber having two end portions each of uniform cross-section, one larger than the other, two piston members respectively engaged in the two end portions of the chamber, elastomeric material filling the chamber between the piston members and occupying at least a part of the larger end portion thereof, sealing means interposed between each of said pistons and said elastomeric material and covering the clearance gap between the piston and the wall of the chamber to prevent access of said elastomeric material to said gap, and means coupling said pistons to said other ends of the two brake shoes.
Claim 7
Dependent Claim
162 words
In a vehicle drum brake including a back plate, actuator means mounted on the back plate, and a pair of brake shoes each having one of its ends connected to the actuator means, an abutment assembly connected between the other ends of the brake shoes, said assembly comprising; means mounted on the back plate defining at least one chamber open at both ends, said chamber having two end portions each of uniform cross-section, one larger than the other, two piston members respectively engaged in the two end portions of the chamber, elastomeric material filling the chamber between the piston members and occupying at least a part of the larger end portion thereof, sealing means interposed between each of said pistons and said elastomeric material and covering the clearance gap between the piston and the wall of the chamber to prevent access of said elastomeric material to said gap, and means coupling said pistons to said other ends of the two brake shoes.
Claim 8
Dependent Claim
18 words
An assembly according to claim 1 wherein said tappets are adjustable in length to compensate for brake wear.
Claim 9
Dependent Claim
25 words
An assembly according to claim 6, wherein means are provided for automatically adjusting the lengths of the tappets in response to operation of the brake.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |