US3747711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake with automatic adjuster mechanism
Assignee: Bendix Corp
•
Filing: 1971-06-25
•
Granted: 1973-07-24
•
Expires: 1991-06-25
Abstract
Abstract An automatic adjuster mechanism for a mechanically actuated disc brake is disclosed. The brake includes the usual caliper housing defining a bore therewithin and a piston slidably mounted in the bore. The caliper is operatively connected to a pair of friction elements, and is adapted to urge the latter into braking engagement with a rotor when the brake is actuated. An adjusting screw is threadedly connected to the piston, so that upon relative rotation between the screw and the piston the screw will extend from the piston. The mechanical actuator includes a cam plate which is rotatable from a first or brake released position to a second or brake applied position. As the cam plate is rotated from the first position to the second position, force transmitting means urge the latter axially within the bore so that the cam plate urges the adjuster screw, and therefore the piston, in a brake applying direction. A one-way clutch spring is carried in the screw and is also operatively connected to the cam plate. When the cam plate is rotated in the brake applying direction in excess of a predetermined amount, the spring turns relative to the screw. However, when the cam plate is rotated in the brake release direction, the spring grippingly engages the screw so that the latter turns with the cam plate after the predetermined amount of lost motion has occurred. As the screw turns, it extends from the piston, thereby effecting adjustment of the brake.
Inventors
- 👤 R Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:09
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D65/14; F16D65/16; F16D65/18; F16D2121/00; F16D2121/02; F16D2121/14; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
291 words
In a brake: a rotor having a pair of friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a torque member; a caliper slidably mounted on said torque member and operably connected to each of said friction elements for urging the latter into braking engagement with their corresponding friction faces when a brake application is effected; said caliper including a housing defining a bore therewithin; actuating means within said bore for urging said friction elements toward their corresponding friction faces; said actuating means including an extendible member slidable in said bore and operably connected to one of said friction elements, said extendible member having a pair of relatively rotatable elements, said member extending upon relative rotation between said elements, cam means rotatably mounted in said bore for sliding said extendible member upon rotation of said cam means, and clutch means between said cam means and one of said elements, said clutch means permitting relative rotation between the cam means and said one element when the brake is actuated, but joining said one element for rotation with the cam means after the latter rotates for a predetermined distance when the brake is released; said cam means including a rotatable member mounted in said bore, said rotatable member being rotatable in a first direction to apply said brake and rotatable in the opposite direction when the brake is released; said clutch means including resilient means disposed between said rotatable member and said one element, said resilient means moving relative to said one element when the rotatable member is rotated in said first direction, but locking said one element for rotation with said rotatable member when the latter is rotated in the opposite direction.
Claim 2
Dependent Claim
291 words
In a brake: a rotor having a pair of friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a torque member; a caliper slidably mounted on said torque member and operably connected to each of said friction elements for urging the latter into braking engagement with their corresponding friction faces when a brake application is effected; said caliper including a housing defining a bore therewithin; actuating means within said bore for urging said friction elements toward their corresponding friction faces; said actuating means including an extendible member slidable in said bore and operably connected to one of said friction elements, said extendible member having a pair of relatively rotatable elements, said member extending upon relative rotation between said elements, cam means rotatably mounted in said bore for sliding said extendible member upon rotation of said cam means, and clutch means between said cam means and one of said elements, said clutch means permitting relative rotation between the cam means and said one element when the brake is actuated, but joining said one element for rotation with the cam means after the latter rotates for a predetermined distance when the brake is released; said cam means including a rotatable member mounted in said bore, said rotatable member being rotatable in a first direction to apply said brake and rotatable in the opposite direction when the brake is released; said clutch means including resilient means disposed between said rotatable member and said one element, said resilient means moving relative to said one element when the rotatable member is rotated in said first direction, but locking said one element for rotation with said rotatable member when the latter is rotated in the opposite direction.
Claim 3
Dependent Claim
40 words
The invention of claim 1: said rotatable member having a circumferentially extending slot; and a tab extending from said resilient means engaging said slot, whereby said rotatable member may be rotated relative to said resilient means for a predetermined distance.
Claim 4
Dependent Claim
12 words
The invention of claim 2: said resilient means being a coiled spring.
Claim 5
Dependent Claim
310 words
In a brake: a rotor having a pair of friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a torque member; a caliper slidably mounted on said torque member and operably connected to each of said friction elements for urging the latter into braking engagement with their corresponding friction faces when a brake application is effected; said caliper including a housing defining a bore therewithin; actuating means within said bore for urging said friction elements toward their corresponding friction faces; said actuating means including an extendible member slidable in said bore and operably connected to one of said friction elements, said extendible member having a pair of relatively rotatable elements, said member extending upon relative rotation between said elements, cam means rotatably mounted in said bore for sliding said extendible member upon rotation of said cam means, and clutch means between said cam means and one of said elements, said clutch means permitting relative rotation between the cam means and said one element when the brake is actuated, but joining said one element for rotation with the cam means after the latter rotates for a predetermined distance when the brake is released; said cam means including a rotatable member mounted within said bore, said rotatable member being rotatable in a first direction to apply said brake and rotatable in the opposite direction when the brake is released; said clutch means including resilient means carried by said one element and haVing a projecting tab engaging said rotatable member, said resilient means being adapted to rotate with said rotatable member, said resilient means slipping on said one element when said rotatable member is rotated in said first direction, but gripping said one element when the rotatable member is rotated in the opposite direction to rotate the one element with said rotatable member.
Claim 6
Dependent Claim
310 words
In a brake: a rotor having a pair of friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a torque member; a caliper slidably mounted on said torque member and operably connected to each of said friction elements for urging the latter into braking engagement with their corresponding friction faces when a brake application is effected; said caliper including a housing defining a bore therewithin; actuating means within said bore for urging said friction elements toward their corresponding friction faces; said actuating means including an extendible member slidable in said bore and operably connected to one of said friction elements, said extendible member having a pair of relatively rotatable elements, said member extending upon relative rotation between said elements, cam means rotatably mounted in said bore for sliding said extendible member upon rotation of said cam means, and clutch means between said cam means and one of said elements, said clutch means permitting relative rotation between the cam means and said one element when the brake is actuated, but joining said one element for rotation with the cam means after the latter rotates for a predetermined distance when the brake is released; said cam means including a rotatable member mounted within said bore, said rotatable member being rotatable in a first direction to apply said brake and rotatable in the opposite direction when the brake is released; said clutch means including resilient means carried by said one element and haVing a projecting tab engaging said rotatable member, said resilient means being adapted to rotate with said rotatable member, said resilient means slipping on said one element when said rotatable member is rotated in said first direction, but gripping said one element when the rotatable member is rotated in the opposite direction to rotate the one element with said rotatable member.
Claim 7
Dependent Claim
34 words
The invention of claim 4: said rotatable member having a circumferentially extending slot; said tab engaging said slot, whereby said rotatable member may be rotated relative to said resilient means for a predetermined distance.
Claim 8
Dependent Claim
12 words
The invention of claim 5: said resilient means being a coiled spring.
Claim 9
Dependent Claim
68 words
The invention of claim 4: said one element being an annular member defining a bore therewithin, one end of said bore facing said rotatable member; said resilient means being a coiled spring confined within the end of said bore facing said rotatable member, the coils of said spring grippingly engaging the wall of said bore when said spring is rotated in said opposite direction with said rotatable member.
Claim 10
Dependent Claim
49 words
The invention of claim 7: said rotatable member having a circumferentially extending slot; said tab projecting from the coil of said spring adjacent said one end of the bore and engaging said slot, whereby said rotatable member may be rotated relative to said resilient means for a predetermined distance.
Claim 11
Dependent Claim
24 words
The invention of claim 7: said other element being a piston slidable in said bore, said one element being threadedly engaged with said piston.
References Cited (Backward Citations)
US3211263A
Cited
US3590964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |