US3717227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical couplings
Assignee: Girling Ltd
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Filing: 1971-01-28
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Granted: 1973-02-20
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Expires: 1991-01-28
Abstract
Abstract A brake operating mechanism has a variable length strut between the shoes. The strut is adjusted in length by a pawl and ratchet. A pawl carrying arm is moved to engage the ratchet by a rockerarm pivotally connected between the strut and either one of the brake shoes or a lever of an auxiliary brake actuating means pivotal to said one of the brake shoes.
Inventors
- 👤 H Rath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:05
CPC Classifications
F; F16; F16D; F16D51/00; F16D51/16; F16D51/18; F16D51/20; F16D51/24; F16D65/00; F16D65/02; F16D65/04; F16D65/08; F16D65/09; F16D65/091; F16D65/38; F16D65/40; F16D65/52; F16D65/54; F16D65/546; F16D65/56; F16D65/561; F16D65/563
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
192 words
An operating mechanism for a mechanical coupling such as an internal shoe drum brake comprising a. a mounting, b. a pair of opposed arcuate friction elements carried from said mounting, c. means for biassing the friction elements radially inwardly towards each other, d. a torque absorbing means on said mounting and disposed between one pair of adjoining ends of the friction elements, e. an actuator on said mounting and disposed between the other pair of adjoining ends of the friction elements, f. a strut disposed between the two elements to establish a controlled spacing between the elements, said strut comprising screw engaged parts, one of which has a ratchet wheel rotating means so arranged as to cause elongation of said strut, g. a rocker arm having one end pivotally engaged with the strut substantially along its horizontal axis and the other end pivotally engaged with the second of said elements, and h. an arm movable by said rocker arm and carrying a pawl for engagement with the ratchet wheel so arranged as to cause rotation of the ratchet wheel when the actuator is operated and the separation of said elements is excessive.
Claim 2
Dependent Claim
192 words
An operating mechanism for a mechanical coupling such as an internal shoe drum brake comprising a. a mounting, b. a pair of opposed arcuate friction elements carried from said mounting, c. means for biassing the friction elements radially inwardly towards each other, d. a torque absorbing means on said mounting and disposed between one pair of adjoining ends of the friction elements, e. an actuator on said mounting and disposed between the other pair of adjoining ends of the friction elements, f. a strut disposed between the two elements to establish a controlled spacing between the elements, said strut comprising screw engaged parts, one of which has a ratchet wheel rotating means so arranged as to cause elongation of said strut, g. a rocker arm having one end pivotally engaged with the strut substantially along its horizontal axis and the other end pivotally engaged with the second of said elements, and h. an arm movable by said rocker arm and carrying a pawl for engagement with the ratchet wheel so arranged as to cause rotation of the ratchet wheel when the actuator is operated and the separation of said elements is excessive.
Claim 3
Dependent Claim
192 words
An operating mechanism for a mechanical coupling such as an internal shoe drum brake comprising a. a mounting, b. a pair of opposed arcuate friction elements carried from said mounting, c. means for biassing the friction elements radially inwardly towards each other, d. a torque absorbing means on said mounting and disposed between one pair of adjoining ends of the friction elements, e. an actuator on said mounting and disposed between the other pair of adjoining ends of the friction elements, f. a strut disposed between the two elements to establish a controlled spacing between the elements, said strut comprising screw engaged parts, one of which has a ratchet wheel rotating means so arranged as to cause elongation of said strut, g. a rocker arm having one end pivotally engaged with the strut substantially along its horizontal axis and the other end pivotally engaged with the second of said elements, and h. an arm movable by said rocker arm and carrying a pawl for engagement with the ratchet wheel so arranged as to cause rotation of the ratchet wheel when the actuator is operated and the separation of said elements is excessive.
Claim 4
Dependent Claim
192 words
An operating mechanism for a mechanical coupling such as an internal shoe drum brake comprising a. a mounting, b. a pair of opposed arcuate friction elements carried from said mounting, c. means for biassing the friction elements radially inwardly towards each other, d. a torque absorbing means on said mounting and disposed between one pair of adjoining ends of the friction elements, e. an actuator on said mounting and disposed between the other pair of adjoining ends of the friction elements, f. a strut disposed between the two elements to establish a controlled spacing between the elements, said strut comprising screw engaged parts, one of which has a ratchet wheel rotating means so arranged as to cause elongation of said strut, g. a rocker arm having one end pivotally engaged with the strut substantially along its horizontal axis and the other end pivotally engaged with the second of said elements, and h. an arm movable by said rocker arm and carrying a pawl for engagement with the ratchet wheel so arranged as to cause rotation of the ratchet wheel when the actuator is operated and the separation of said elements is excessive.
Claim 5
Dependent Claim
33 words
A mechanism according to claim 1 wherein said one end of the said rocker arm is held by a spring in abutment with the end of the strut, the abutment permitting pivotal movement.
Claim 6
Dependent Claim
19 words
A mechanism according to claim 2 wherein the strut is urged against the leading friction element by said spring.
Claim 7
Dependent Claim
38 words
A mechanism according to claim 1 wherein the said rocker arm is connected by a pivot pin to the strut and is held by a spring in abutment with the said one element, the abutment permitting pivotal movement.
Claim 8
Dependent Claim
34 words
A mechanism according to claim 1 wherein said one end of the rocker arm has a projection which fits in a recess in the strut and is positively located thereby axially of the strut.
Claim 9
Dependent Claim
31 words
A mechanism according to claim 1 wherein said one element includes a member operated by auxiliary actuating means to push said strut and said element apart whereby to actuate the coupling.
Claim 10
Dependent Claim
37 words
A mechanism according to claim 6 wherein said member is a lever pivotal on a web of said one friction element and displaceable by the auxiliary actuating means to increase the effective radial depth of said web.
Claim 11
Dependent Claim
15 words
A mechanism according to claim 7 wherein the rocker arm is pivotal on the lever.
Claim 12
Dependent Claim
38 words
A mechanism according to claim 1 wherein the strut comprises a male threaded part slidable in a tubular part and with an internally threaded ratchet wheel threadedly engaged with said male threaded part and abutting the tubular part.
Claim 13
Dependent Claim
29 words
A mechanism according to claim 1 wherein the strut comprises two oppositely threaded male parts and a cooperating ratchet wheel part which is oppositely threaded at its axial ends.
Claim 14
Dependent Claim
20 words
A mechanism according to claim 1 wherein the strut slidably engages said one element but is pinned to the other.
Claim 15
Dependent Claim
26 words
A mechanism according to claim 1 wherein the pawl carrying arm is abutted by said rocker arm for causing the movement of the pawl carrying arm.
Claim 16
Dependent Claim
17 words
A mechanism according to claim 1 wherein the pawl carrying arm is rigid with the rocker arm.
Claim 17
Dependent Claim
13 words
A mechanism according to claim 1 wherein the pawl carrying arm is resilient.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |