Patent US3621944A successfully refreshed from Google Patents.
US3621944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A disc brake including a compact automatic slack adjuster and parking brake
Assignee: Siemens Mobility Ltd
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Filing: 1969-10-03
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Granted: 1971-11-23
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Expires: 1989-10-03
Abstract
Abstract A caliper disc brake having a pressure responsive member which acts on a second member which in turn acts on a driven member to actuate the brake discs. The second member also forms a part of both a slack adjuster and a parking brake. As part of the slack adjuster it has helical threads which are engaged by pawls spaced thereabout. As part of the parking brake, it is mounted to be moved axially by a separate actuating element, independently of its movement by the pressure-responsive means, to act on the driven member to hold the brake against release.
Inventors
- 👤 Keith W Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:16
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
244 words
A disc brake comprising, in combination a brake housing, disc brake elements mounted on the housing for movement to engage and hence brake a rotating disc, a brake actuator situated between the housing and one of said braking elements, said brake actuator including a nonrotatable pressure-responsive member operable under pressure to actuate the brake, a rotatable second member movable axially toward the disc-braking elements by said pressure-responsive member, a normally nonrotatable driven member threadedly engaged with the second member such that said axial movement of the second member towards the disc-braking element moves the driven member to effect brake actuation, a slack adjuster means for taking up wear slack between the braking elements and the rotating disc, said slack adjuster means comprising a set of helical ratchet teeth formed around the second member and a series of pawls engaging the ratchet teeth, the pawls being spaced one from another around the second member by other than a whole number of teeth, whereby slack adjustment is effected when a pawl crosses one of said teeth, as this ultimately causes rotation of the driven member and hence movement of the driven member toward the disc-braking elements relative to the second member, and a parking brake means for preventing the return of the brake, once actuated, to its release position, said parking brake means comprising a further actuating means operable independently of the pressure-responsive means for moving the second member axially to act on the driven member.
Claim 2
Dependent Claim
244 words
A disc brake comprising, in combination a brake housing, disc brake elements mounted on the housing for movement to engage and hence brake a rotating disc, a brake actuator situated between the housing and one of said braking elements, said brake actuator including a nonrotatable pressure-responsive member operable under pressure to actuate the brake, a rotatable second member movable axially toward the disc-braking elements by said pressure-responsive member, a normally nonrotatable driven member threadedly engaged with the second member such that said axial movement of the second member towards the disc-braking element moves the driven member to effect brake actuation, a slack adjuster means for taking up wear slack between the braking elements and the rotating disc, said slack adjuster means comprising a set of helical ratchet teeth formed around the second member and a series of pawls engaging the ratchet teeth, the pawls being spaced one from another around the second member by other than a whole number of teeth, whereby slack adjustment is effected when a pawl crosses one of said teeth, as this ultimately causes rotation of the driven member and hence movement of the driven member toward the disc-braking elements relative to the second member, and a parking brake means for preventing the return of the brake, once actuated, to its release position, said parking brake means comprising a further actuating means operable independently of the pressure-responsive means for moving the second member axially to act on the driven member.
Claim 3
Dependent Claim
40 words
A disc brake according to claim 1, said housing being a brake caliper having a pair of legs carrying the disc braking elements, said brake actuator located between one of the caliper legs and one of said disc braking elements.
Claim 4
Dependent Claim
57 words
A disc brake according to claim 2, said further actuating means comprising a further element axially abutting the second member and including threads formed on the further element, and engaged with threads on the housing, such that rotation of the further element causes axial movement thereof to move the second member axially to actuate the driven member.
Claim 5
Dependent Claim
20 words
A disc brake according to claim 1, wherein the pressure-responsive member constitutes a piston of a piston and cylinder arrangement.
Claim 6
Dependent Claim
35 words
A disc brake according to claim 4, wherein the pawls are carried by the cylinder of the arrangement, and wherein a series of piston return springs are located in the cylinder interspersed between the pawls.
Claim 7
Dependent Claim
24 words
A disc brake according to claim 5, wherein the springs abut a plate which abuts the second member, which in turn abuts the piston.
Claim 8
Dependent Claim
52 words
A disc brake according to claim 1, wherein the second member is tubular and the said threads thereof engage with threads of the driven member which are formed on the internal wall of the second member, and whereiN the helical ratchet teeth are formed on the external wall of the second member.
Claim 9
Dependent Claim
32 words
A disc brake according to claim 1, wherein the driven member, while normally being nonrotatable, is rotatable at will to screw the driven member axially inwardly or outwardly of the second member.
Claim 10
Dependent Claim
57 words
A disc brake according to claim 8, wherein the driven member is provided with a noncircular bore through which extends an element of transverse cross-sectional shape which is complementary to that of the bore whereby the driven member is free to move longitudinally of the bore but rotation of the element effects rotation of the driven member.
Claim 11
Dependent Claim
42 words
A disc brake according to claim 5, wherein the pawls are provided by elements slidable within complementary bores in the cylinder and the elements are resiliently loaded in a direction urging the elements inwardly towards the ratchet teeth on the second member.
Claim 12
Dependent Claim
36 words
A disc brake according to claim 1, wherein the pawls are spaced x+ 1/n teeth from its next adjacent pawl in the series, where x is a whole number and n is the number of pawls.
Claim 13
Dependent Claim
69 words
A disc brake according to claim 4, wherein the cylinder of the arrangement has a boss internally threaded and with the threads of which is threadedly engaged an element by which return of the piston can be prevented, such that rotation of said element relative to the boss moves said element into a position in which the piston of the arrangement is prevented from returning to the brakes-released position.
Claim 14
Dependent Claim
47 words
A disc brake according to claim 12, wherein the said element by which return of the piston can be prevented, has an arm to which is pivotally connected a further piston-and-cylinder arrangement, pressurization of which in a particular manner extends the piston rod to rotate the element.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |