US3774733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake adjusters
Assignee: Girling Ltd
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Filing: 1972-08-07
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Granted: 1973-11-27
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Expires: 1992-08-07
Abstract
Abstract An encapsulated slack adjuster mechanism for a vehicle brake comprises an encapsulating container in which are disposed a nut having a non-reversible internal thread, an annulus encircling the nut, a reversible screwthread connection and cooperating friction surfaces. The reversible screw thread connection is between the annulus and the container or between the annulus and the nut whilst the friction surfaces are between the annulus and the nut or between the annulus and the container, respectively. A first spring acts on the annulus to urge the friction surfaces towards one another. A second spring acts on the second member and urges the latter into engagement by an abutment surface with a complementary non-rotatable abutment surface which may be on the container when the brake is not applied to avoid the nut turning when this is not desired. The first spring is in the container but the second spring may be within the container or may be external thereto. In the latter case the second spring can be a brake return spring.
Inventors
- 👤 G Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:54
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D65/561; F16D2121/00; F16D2121/02; F16D2121/14; F16D2123/00; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/22; F16D2125/26
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
130 words
A slack adjuster for a brake system comprising in combination a first non-rotatable member, a second rotatable nut member and a third non-rotatable member having a common thrust axis, said first and nut members having axially external and internal threads, respectively, forming a non-reversible screw-thread connection between said first and nut members, said nut member being axially displaceable and rotatable relative to said third member, a fourth annular member coaxial with said thrust axis and encircling said nut member; a reversible screw-thread connection between said annular member and one of said nut and third members; cooperating friction surfaCes between said annular member and the other of said nut and third members; and resilient means axially biassing said annular member in a direction to urge said friction surfaces towards one another.
Claim 2
Dependent Claim
130 words
A slack adjuster for a brake system comprising in combination a first non-rotatable member, a second rotatable nut member and a third non-rotatable member having a common thrust axis, said first and nut members having axially external and internal threads, respectively, forming a non-reversible screw-thread connection between said first and nut members, said nut member being axially displaceable and rotatable relative to said third member, a fourth annular member coaxial with said thrust axis and encircling said nut member; a reversible screw-thread connection between said annular member and one of said nut and third members; cooperating friction surfaCes between said annular member and the other of said nut and third members; and resilient means axially biassing said annular member in a direction to urge said friction surfaces towards one another.
Claim 3
Dependent Claim
31 words
A slack adjuster according to claim 1 in which said friction surfaces are in engagement with one another under the bias of said resilient means when the brake system is released.
Claim 4
Dependent Claim
62 words
A slack adjuster according to claim 1, said nut member having an abutment surface, further comprising a non-rotatable abutment surface complementary thereto and second resilient means biassing said nut member in a direction to urge said abutment surfaces into engagement with one another when the brake system is released in order to increase the frictional torque resisting rotation of said nut member.
Claim 5
Dependent Claim
19 words
A slack adjuster according to claim 3 in which said complementary abutment surface is defined on said third member.
Claim 6
Dependent Claim
44 words
A slack adjuster according to claim 4 which further comprises frictional abutment surfaces additional to the previously mentioned abutment and friction surfaces, and in which said second resilient means comprises a spring which acts directly on said nut member at said additional abutment surfaces.
Claim 7
Dependent Claim
18 words
A slack adjuster according to claim 5 in which said spring acts between said nut and third members.
Claim 8
Dependent Claim
35 words
A slack adjuster according to claim 5 which further comprises a cup-shaped abutment element for protecting said reversible screw thread connection from said spring, said spring acts on said nut member through said abutment element.
Claim 9
Dependent Claim
22 words
A slack adjuster according to claim 3 in which said second resilient means comprises a brake return spring external to the adjuster.
Claim 10
Dependent Claim
30 words
A slack adjuster according to claim 1 in which said third member comprises an encapsulating container within which are disposed said nut member, said annular member and said resilient means.
Claim 11
Dependent Claim
35 words
A slack adjuster according to cliam 4 in which said third member comprises an encapsulating container within which are disposed said nut member, said annular member, said first-mentioned resilient means and said additional resilient means.
Claim 12
Dependent Claim
35 words
A slack adjuster according to cliam 4 in which said third member comprises an encapsulating container within which are disposed said nut member, said annular member, said first-mentioned resilient means and said additional resilient means.
Claim 13
Dependent Claim
128 words
A slack adjuster mechanism for a vehicle brake system comprising a nut member having an internal screw thread adapted to mate with an external screw thread on a strut member to form a non-reversible screw thread connection, an encapuslating container member surrounding said nut member, said nut and container members having cooperating axial abutment surfaces, an annular member disposed within said container member and encircling said nut member, said annular member and one of said nut and container members having a reversible screw thread connection therebetween, said annular member and the other of said nut and container members having cooperating friction surfaces therebetween, and resilient means disposed within said container member and axially biassing said annular member in a direction to urge said friction surfaces towards one another.
Claim 14
Dependent Claim
128 words
A slack adjuster mechanism for a vehicle brake system comprising a nut member having an internal screw thread adapted to mate with an external screw thread on a strut member to form a non-reversible screw thread connection, an encapuslating container member surrounding said nut member, said nut and container members having cooperating axial abutment surfaces, an annular member disposed within said container member and encircling said nut member, said annular member and one of said nut and container members having a reversible screw thread connection therebetween, said annular member and the other of said nut and container members having cooperating friction surfaces therebetween, and resilient means disposed within said container member and axially biassing said annular member in a direction to urge said friction surfaces towards one another.
Claim 15
Dependent Claim
27 words
An adjuster mechanism according to claim 11 which further comprises second resilient means acting axially on said nut member to bias said abutment surfaces against one another.
Claim 16
Dependent Claim
29 words
An adjuster mechanism according to claim 12 in which said second resilient means comprises a spring disposed within said container member and acting between said nut and container members.
Claim 17
Dependent Claim
35 words
An adjuster mechanism according to claim 13 which further comprises a cup-shaped abutment element for protecting said reversible screw thread connection from the spring, said spring acting on said nut member through said abutment element.
Claim 18
Dependent Claim
18 words
A slack adjuster according to claim 1 in which at least one of said friction surfaces is conical.
Claim 19
Dependent Claim
48 words
A slack adjuster according to claim 1 in which said annular member has symmetrically oppositely tapering conical surfaces either one of which can serve as said friction surface on said annular member, whereby said annular member may be inserted either of opposite ways round in said third member.
Claim 20
Dependent Claim
66 words
A slack adjuster according to claim 1 wherein said reversible screw thread connection is between said annular member and said third member and comprises an external thread on the outer periphery of said annular member and an internal thread inside said third member and wherein said friction surfaces comprise an internal annular surface inside said annular member and an external friction surface around said nut member.
Claim 21
Dependent Claim
64 words
A slack adjuster according to claim 1 wherein said reversible screw threw connection is disposed between said annular member and said nut member and comprises an internal thread inside said annular member and an external thread around said nut member and wherein said cooperating friction surfaces comprise an external annular surface around said annular member and an internal annular surface inside said third member.
Claim 22
Dependent Claim
21 words
A slack adjuster according to claim 1 in which said resilient means comprises a spring washer bearing against said annular member.
Claim 23
Dependent Claim
101 words
A slack adjuster according to claim 3, wherein said reversible screw thread connection is between said annular member and said third member and comprises an external thread on the outer periphery of said annular member and an internal thread inside said third member and wherein said friction surfaces comprise an internal annular surface inside said annular member and an external friction surface around said nut member and which further comprises an abutment element by which said second resilient means acts on said nut member, said first-mentioned resilient means comprising a spring washer acting between said annular member and said abutment element.
Claim 24
Dependent Claim
98 words
A slack adjuster according to claim 3 wherein said reversible screw thread connection is disposed between said annular member and said nut member and comprises an internal thread inside said annular member and an external thread around said nut member and wherein said cooperating friction surfaces comprise an external annular surface around said annular member and an internal member surface inside said third member and which further comprises a washer held in place in said third member by said second resilient means, said first-mentioned resilient means comprising a spring washer acting between said annular member and said washer.
Claim 25
Dependent Claim
18 words
A slack adjuster according to claim 1 in which said reversible screw thread connection comprises mating multistart threads.
Claim 26
Dependent Claim
31 words
A slack adjuster according to claim 1 in which said reversible screw-thread connection has substantial axial clearance, said axial clearance accommodating at least a preponderance of the desired normal brake slack.
References Cited (Backward Citations)
US3550732A
Cited
DE1910573A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |