US3701400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking actuator for disc brake
Assignee: Bendix Corp
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Filing: 1971-01-20
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Granted: 1972-10-31
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Expires: 1991-01-20
Abstract
Abstract A disc brake includes a rotor mounted for rotation with a member to be braked and a caliper slidably mounted on a fixed torque member. The caliper includes a housing defining a bore therewithin, and a piston is slidably mounted in the bore to urge friction elements disposed on opposite sides of the rotor into braking engagement with the latter when pressurized fluid is admitted into the bore during a brake application. A parking actuator is provided which includes a lever mounted within the caliper housing for rotation about an axis extending generally parallel to the axis of the rotor and for movement relative to the caliper along this axis. An elongated member interconnects the lever with the piston. Force transmitting elements are disposed between the lever and the end of the housing, so that when the lever is rotated, the force transmitting elements urge the latter toward the rotor. This axial movement is transmitted to the piston by the elongated member, to urge the piston toward the rotor, effecting a brake application.
Inventors
- 👤 Richard T Burnett
- 👤 James J Colpaert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:04
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; F16D2123/00; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36; F16D2125/58; F16D2125/60; F16D2127/00; F16D2127/007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
240 words
In a disc brake: a torque member; a rotor having a pair of opposed friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a caliper housing slidably mounted on said torque member straddling said rotor and operatively connected to each of said friction elements; said caliper housing defining a bore therewithin; a piston slidably mounted in said bore for movement toward and away from said rotor to urge said friction elements into braking engagement with their corresponding friction faces when pressurized fluid is admitted into said bore; an extendible member slidably mounted in said bore to limit retraction of the piston to a predetermined distance; said extendible member including first and second relatively rotatable members, one of said members extending axially from the other member upon relatively rotation of the members in a first direction, but retracting into the other member upon relative rotation between the members in the other direction; said one member being operably connected to said piston, said piston being adapted to rotate said one member in said first direction upon movement of the piston toward the rotor; means preventing rotation of said one section upon movement of the piston away from said rotor; and releasable means preventing rotation of said second member, said releasable means permitting retraction of said first member into the second member upon release of said releasable means when the brake is serviced.
Claim 2
Dependent Claim
240 words
In a disc brake: a torque member; a rotor having a pair of opposed friction faces; a pair of friction elements, one of said elements being disposed adjacent each of said friction faces; a caliper housing slidably mounted on said torque member straddling said rotor and operatively connected to each of said friction elements; said caliper housing defining a bore therewithin; a piston slidably mounted in said bore for movement toward and away from said rotor to urge said friction elements into braking engagement with their corresponding friction faces when pressurized fluid is admitted into said bore; an extendible member slidably mounted in said bore to limit retraction of the piston to a predetermined distance; said extendible member including first and second relatively rotatable members, one of said members extending axially from the other member upon relatively rotation of the members in a first direction, but retracting into the other member upon relative rotation between the members in the other direction; said one member being operably connected to said piston, said piston being adapted to rotate said one member in said first direction upon movement of the piston toward the rotor; means preventing rotation of said one section upon movement of the piston away from said rotor; and releasable means preventing rotation of said second member, said releasable means permitting retraction of said first member into the second member upon release of said releasable means when the brake is serviced.
Claim 3
Dependent Claim
61 words
The invention of claim 1: said releasable means including an annular member circumscribing said second member, said annular member being connected to said second member to permit relative axial movement therebetween but to prevent relative rotation between the annular member and the second member, and a fastener securing said annular member to said housing to prevent relative movement with respect thereto.
Claim 4
Dependent Claim
238 words
In a disc brake: a torque member; a rotor having a pair of opposed friction faces; a pair of friction elements, one of said element being disposed adjacent each of said friction faces; a caliper housing member slidably mounted on said torque member straddling said rotor and operatively connected to each of said friction elements; said caliper housing member defining a bore therewithin; a piston slidably mounted in said bore for movement toward and away from said rotor to urge said friction elements into braking engagement with their corresponding friction faces when pressurized fluid is admitted into said bore; a lever wholly enclosed within said caliper housing member, said lever being rotatable about an axis generally parallel to the axis of said rotor from a brake released position to a brake actuated position; a cable secured to said lever and extending from said housing member for actuating said lever; stop means within said housing member; said brake released position being defined by engagement of said lever with said stop means; resilient means wholly enclosed within said housing member yieldably urging said lever into engagement with said stop means; an elongated member slidably mounted in said housing member and extending bEtween said lever and said piston; and force transmitting elements disposed between one of said members and said lever for urging said elongated member and said piston toward the rotor when said lever is rotated toward the actuated position.
Claim 5
Dependent Claim
238 words
In a disc brake: a torque member; a rotor having a pair of opposed friction faces; a pair of friction elements, one of said element being disposed adjacent each of said friction faces; a caliper housing member slidably mounted on said torque member straddling said rotor and operatively connected to each of said friction elements; said caliper housing member defining a bore therewithin; a piston slidably mounted in said bore for movement toward and away from said rotor to urge said friction elements into braking engagement with their corresponding friction faces when pressurized fluid is admitted into said bore; a lever wholly enclosed within said caliper housing member, said lever being rotatable about an axis generally parallel to the axis of said rotor from a brake released position to a brake actuated position; a cable secured to said lever and extending from said housing member for actuating said lever; stop means within said housing member; said brake released position being defined by engagement of said lever with said stop means; resilient means wholly enclosed within said housing member yieldably urging said lever into engagement with said stop means; an elongated member slidably mounted in said housing member and extending bEtween said lever and said piston; and force transmitting elements disposed between one of said members and said lever for urging said elongated member and said piston toward the rotor when said lever is rotated toward the actuated position.
Claim 6
Dependent Claim
93 words
The invention of claim 3: said lever and said one member having mating recesses receiving said force transmitting elements; the recesses in the lever being in substantial alignment with the recesses in said one member when the lever is disposed in the brake released position, the recesses in the lever being displaced from the recesses in said one member when the lever is rotated toward the brake actuated position thereby urging said force transmitting elements up the sides of the recesses to thereby urge the elongated member and said piston toward the rotor.
Claim 7
Dependent Claim
44 words
The invention of claim 4: said resilient means being a torsional spring having at least one coil circumscribing said elongated member, and a pair of arms extending from said coil, one of said arms engaging said lever, the other arm engaging said housing member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |