Patent US1259101A successfully refreshed from Google Patents.
Patent US3651828A successfully refreshed from Google Patents.
US3651828A
Expired / Lapsed
US
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Hydraulic brake control valves
Assignee: Girling Ltd
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Filing: 1969-12-31
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Granted: 1972-03-28
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Expires: 1989-12-31
Abstract
Abstract The invention is an improvement in vehicle brake pressure control means of the type in which a brake pressure control valve is subject to the action of a spring load, varying with changing vehicle loading conditions, which modifies the operating characteristics (pressure reducing, pressure increasing or pressure limiting) of the valve. A coil torsion spring has opposed arms, one of which is connected to an unsprung vehicle part and the other to the sprung part. The latter arm is pivotally connected to a mounting bracket by means of a clamping member which holds the arm in rocking engagement with a fixed fulcrum.
Inventors
- 👤 Thomas G Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:34
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1837; B60T8/185; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6855; Y10T137/6881
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
In vehicle brake pressure control means, for a vehicle having a sprung part and an unsprung part, comprising a pressure control valve having a movable member whose loading determines the operating characteristics of the valve, means for mounting the valve on one of the said parts of the vehicle and a control spring having a coil portion, one end of which acts on the said movable member and the other end of which is adapted to be connected to the other of the said vehicle parts in such a manner that, in use, variations in the loading of the vehicle effect relative angular displacement of the ends of the spring about the axis of the coil to vary the stress therein and the loading of the movable member, the improvement which comprises a fixed fulcrum on said mounting means and a clamping member acting to hold said one end of said spring against said fulcrum for rocking motion about said fulcrum.
Claim 2
Dependent Claim
161 words
In vehicle brake pressure control means, for a vehicle having a sprung part and an unsprung part, comprising a pressure control valve having a movable member whose loading determines the operating characteristics of the valve, means for mounting the valve on one of the said parts of the vehicle and a control spring having a coil portion, one end of which acts on the said movable member and the other end of which is adapted to be connected to the other of the said vehicle parts in such a manner that, in use, variations in the loading of the vehicle effect relative angular displacement of the ends of the spring about the axis of the coil to vary the stress therein and the loading of the movable member, the improvement which comprises a fixed fulcrum on said mounting means and a clamping member acting to hold said one end of said spring against said fulcrum for rocking motion about said fulcrum.
Claim 3
Dependent Claim
57 words
The improved control means of claim 1, wherein said fixed fulcrum is constituted by a fixed pivot pin carried by said mounting means, and said clamping member is secured to said spring close to one end thereof, said spring and clamping member being engaged over said pin from opposite sides thereof to form a pivotal connection therewith.
Claim 4
Dependent Claim
35 words
The improved control means of claim 2, wherein said spring is shaped to have spaced parallel limbs extending transversely to said pivot pin, and said clamping member bridges said limbs and is securely clamped thereto.
Claim 5
Dependent Claim
27 words
The improved control means of claim 2, wherein said spring and said clamping member are each formed with a partial open loop engaging over said pivot pin.
Claim 6
Dependent Claim
31 words
The improved control means of claim 2, comprising an abutment secured to said clamping member and spaced from said pivot pin for engagement with said movable member of said control valve.
Claim 7
Dependent Claim
27 words
The improved control means of claim 5, comprising means for adjusting said abutment, relative to said clamping member, along the line of action of said movable member.
Claim 8
Dependent Claim
52 words
The improved control means of claim 1, wherein said mounting means is shaped to define an aperture having an edge, said one end of said control spring extends through said aperture, and said clamping member is operative to hold said spring engaged against said edge, whereby said edge constitutes said fixed fulcrum.
Claim 9
Dependent Claim
41 words
The improved control means of claim 7, wherein said mounting means has a tongue projecting into said aperture from said edge and said edge and said one end of said spring is shaped to form a loop engaged over said tongue.
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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) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |