US3633715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake with spring brake and pressure-compensating self-adjuster
Assignee: Bendix Corp
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Filing: 1969-01-05
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Granted: 1972-01-11
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Expires: 1989-01-05
Abstract
Abstract A disc brake actuator is disclosed which includes a piston for urging the brakeshoes toward a rotor and an automatic adjuster to properly position the piston in the actuator housing. The adjuster is actuated by relative movement between it and the piston and is mounted on a member that reciprocates with the piston during high-pressure brake applications thus precluding adjustment, but is held stationary during low-pressure applications to permit operation of the adjuster. Such a compensated adjuster is particularly useful when mechanical actuation is provided in addition to the usual hydraulic actuator.
Inventors
- 👤 Richard T Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:29
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; F16D2121/12; F16D2123/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
323 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of said rotor: a housing defining a bore therewithin divided into first and second coaxial chambers; a piston slidable in said first chamber toward and away from said rotor; an elongated member slidably carried by said housing, and having the opposed ends thereof disposed in said first and second chambers respectively; mechanism carried on said member adapted to engage said piston for limiting retraction of the latter; a movable wall slidable in said second chamber from a rearwardmost position to a forwardmost position; releasable resilient means operatively connected to said housing and said movable wall for urging the latter from said rearwardmost position to said forwardmost position upon release of the resilient means; coupling means joining said movable wall and said elongated member for movement together when the movable wall is urged toward the forwardmost position; said coupling means permitting relative movement between the member and the wall when the movable wall is disposed in the rearwardmost position; said mechanism being an automatic adjuster mounted for movement on said member toward one end of the latter upon relative movement between the adjuster mechanism and the piston for positioning the latter in the fore; a closed end cylinder mounted in said second chamber slidably receiving the other end of said member; said cylinder and said other end defining a variable-volume chamber therebetween; spring means engaging said member for biasing the latter toward the closed end of said cylinder; and a conduit for simultaneously admitting pressurized fluid into said first chamber for forcing the piston toward the rotor and into said variable-volume chamber to urge the member from the cylinder against the bias of said spring means; said releasable resilient means having an annular opening therein coaxial with said first and second chambers; said opening receiving said cylinder, whereby said releasable resilient means is supported by said cylinder.
Claim 2
Dependent Claim
323 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of said rotor: a housing defining a bore therewithin divided into first and second coaxial chambers; a piston slidable in said first chamber toward and away from said rotor; an elongated member slidably carried by said housing, and having the opposed ends thereof disposed in said first and second chambers respectively; mechanism carried on said member adapted to engage said piston for limiting retraction of the latter; a movable wall slidable in said second chamber from a rearwardmost position to a forwardmost position; releasable resilient means operatively connected to said housing and said movable wall for urging the latter from said rearwardmost position to said forwardmost position upon release of the resilient means; coupling means joining said movable wall and said elongated member for movement together when the movable wall is urged toward the forwardmost position; said coupling means permitting relative movement between the member and the wall when the movable wall is disposed in the rearwardmost position; said mechanism being an automatic adjuster mounted for movement on said member toward one end of the latter upon relative movement between the adjuster mechanism and the piston for positioning the latter in the fore; a closed end cylinder mounted in said second chamber slidably receiving the other end of said member; said cylinder and said other end defining a variable-volume chamber therebetween; spring means engaging said member for biasing the latter toward the closed end of said cylinder; and a conduit for simultaneously admitting pressurized fluid into said first chamber for forcing the piston toward the rotor and into said variable-volume chamber to urge the member from the cylinder against the bias of said spring means; said releasable resilient means having an annular opening therein coaxial with said first and second chambers; said opening receiving said cylinder, whereby said releasable resilient means is supported by said cylinder.
Claim 3
Dependent Claim
213 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of said rotor: a housing defining a bore therewithin divided into first and second coaxial chambers; a piston slidable in said first chamber toward and away from said rotor; an elongated member slidably carried by said housing, and having the opposed ends thereof disposed in said first and second chambers respectively; mechanism carried on saiD member adapted to engage said piston for limiting retraction of the latter; a movable wall slidable in said second chamber from a rearwardmost position to a forwardmost position; releasable resilient means operatively connected to said housing and said movable wall for urging the latter from said rearwardmost position to said forwardmost position upon release of the resilient means; and coupling means joining said movable wall and said elongated member for movement together when the movable wall is urged toward the forwardmost position; said coupling means permitting relative movement between the member and the wall when the movable wall is disposed in the rearwardmost position; said housing having an annular partition therein separating said first and second chambers; said movable wall having an axially extending annular section slidably supported by said partition; said axially extending annular section slidably receiving said elongated member.
Claim 4
Dependent Claim
213 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of said rotor: a housing defining a bore therewithin divided into first and second coaxial chambers; a piston slidable in said first chamber toward and away from said rotor; an elongated member slidably carried by said housing, and having the opposed ends thereof disposed in said first and second chambers respectively; mechanism carried on saiD member adapted to engage said piston for limiting retraction of the latter; a movable wall slidable in said second chamber from a rearwardmost position to a forwardmost position; releasable resilient means operatively connected to said housing and said movable wall for urging the latter from said rearwardmost position to said forwardmost position upon release of the resilient means; and coupling means joining said movable wall and said elongated member for movement together when the movable wall is urged toward the forwardmost position; said coupling means permitting relative movement between the member and the wall when the movable wall is disposed in the rearwardmost position; said housing having an annular partition therein separating said first and second chambers; said movable wall having an axially extending annular section slidably supported by said partition; said axially extending annular section slidably receiving said elongated member.
Claim 5
Dependent Claim
48 words
The invention of claim 2: said elongated member having a radially projecting shoulder adapted to engage the end of said axially extending section; said coupling means being a recess on said shoulder adapted to be engaged by a mating lug on the end of the axially extending section.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |