US3661230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake with actuating means and manually releasable adjusting means
Assignee: Bendix Corp
•
Filing: 1970-05-18
•
Granted: 1972-05-09
•
Expires: 1990-05-18
Abstract
Abstract A disc brake is disclosed which has a spring actuator in addition to the usual hydraulic actuator. When the brake is functioning normally, fluid pressure opposes the spring actuator to permit normal hydraulic operation of the brake. However, when a malfunction in the vehicle''s hydraulic system prevents operation of the hydraulic actuator, the spring actuator automatically applies the brake to immobilize the vehicle. A mechanical release mechanism for the spring actuator is provided so that the vehicle may be moved if the spring actuator applies the brake in an inconvenient location. The spring actuator may also be used as a parking brake.
Inventors
- 👤 Richard T Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:14
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; F16D2121/14; F16D2123/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
335 words
In a disc brake: a torque member; 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 caliper slidably mounted on said torque member bridging said rotor and including a housing defining a bore therewithin; a piston slidable in said bore operably connected to each of said friction elements for forcing the latter against their corresponding friction faces when the brake is actuated; an annular member carried by the housing aligned with the piston; an adjuster member for engagement with the piston to limit retraction of the latter to a substantially constant distance despite wear of the friction elements; said adjuster member including an axially extending portion extending into said annular member, there being complementary screw threads on said portion and on the inner surface of the annular member, the threads on said portion engaging the threads on the annular member, said threads permitting an axially applied force on said adjuster member to rotate the latter thereby extending the adjuster member from the annular member; the adjuster member for rotating the latter upon movement of the piston toward the rotor in excess of a predetermined distance; means for urging said adjuster member into engagement with said piston and thereafter urging said members and said piston toward said rotor to drive said friction elements into engagement with their corresponding friction faces whereby said piston applies an axially directed force on said adjuster member acting away from said rotor, said force frictionally restraining the adjuster member from rotation relative to the housing; and means movable from a first position preventing relative rotation between the annular member and the housing to a second position permitting said rotation; said annular member rotating relative to said adjuster member upon movement of said last-mentioned means to said second position to permit said portion to retract into said annular member to move the adjuster member away from the rotor to thereby relieve said axially directed force.
Claim 2
Dependent Claim
335 words
In a disc brake: a torque member; 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 caliper slidably mounted on said torque member bridging said rotor and including a housing defining a bore therewithin; a piston slidable in said bore operably connected to each of said friction elements for forcing the latter against their corresponding friction faces when the brake is actuated; an annular member carried by the housing aligned with the piston; an adjuster member for engagement with the piston to limit retraction of the latter to a substantially constant distance despite wear of the friction elements; said adjuster member including an axially extending portion extending into said annular member, there being complementary screw threads on said portion and on the inner surface of the annular member, the threads on said portion engaging the threads on the annular member, said threads permitting an axially applied force on said adjuster member to rotate the latter thereby extending the adjuster member from the annular member; the adjuster member for rotating the latter upon movement of the piston toward the rotor in excess of a predetermined distance; means for urging said adjuster member into engagement with said piston and thereafter urging said members and said piston toward said rotor to drive said friction elements into engagement with their corresponding friction faces whereby said piston applies an axially directed force on said adjuster member acting away from said rotor, said force frictionally restraining the adjuster member from rotation relative to the housing; and means movable from a first position preventing relative rotation between the annular member and the housing to a second position permitting said rotation; said annular member rotating relative to said adjuster member upon movement of said last-mentioned means to said second position to permit said portion to retract into said annular member to move the adjuster member away from the rotor to thereby relieve said axially directed force.
Claim 3
Dependent Claim
51 words
The invention of claim 1: said movable means including a member held against rotation relative to the housing, said movable means in said first position frictionally engaging said annular member a substantial distance from the axis of rotation of the latter to exert a torque thereon preventing rotation of the latter.
Claim 4
Dependent Claim
213 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of the rotor, an actuator comprising: a housing defining a bore therewithin; a piston slidable in said bore and operatively connected to said friction elements for forcing the latter against said rotor; first and second relatively rotatable elongated members within said bore for limiting retraction of said piston to a predetermined amount, said members being interconnected to permit one of the members to extend from and retract into the other member upon relative rotation between the members, said piston being adapted to rotate one of said members to thereby extend said one member from the other member upon relative movement between the piston and the members in excess of a predetermined distance; actuating means in said housing for urging said members and said piston as a unit toward said rotor to urge said friction elements into engagement with said rotor; and manually manipulable means extending from said housing and restrained from rotation relative to the latter, said manually manipulable means being shiftable from a first condition frictionally engaging the other member to prevent rotation of the latter to a second position permitting rotation of the other member to retract the one member into the other member.
Claim 5
Dependent Claim
213 words
In a disc brake having a rotor and a pair of friction elements disposed on opposite sides of the rotor, an actuator comprising: a housing defining a bore therewithin; a piston slidable in said bore and operatively connected to said friction elements for forcing the latter against said rotor; first and second relatively rotatable elongated members within said bore for limiting retraction of said piston to a predetermined amount, said members being interconnected to permit one of the members to extend from and retract into the other member upon relative rotation between the members, said piston being adapted to rotate one of said members to thereby extend said one member from the other member upon relative movement between the piston and the members in excess of a predetermined distance; actuating means in said housing for urging said members and said piston as a unit toward said rotor to urge said friction elements into engagement with said rotor; and manually manipulable means extending from said housing and restrained from rotation relative to the latter, said manually manipulable means being shiftable from a first condition frictionally engaging the other member to prevent rotation of the latter to a second position permitting rotation of the other member to retract the one member into the other member.
Claim 6
Dependent Claim
92 words
The invention of claim 3: said manually manipulable means including inner and outer threadedly interconnected elements, said outer member being urged into frictional engagement with said other member at a substantial distance from the centerline of the outer member when the manually manipulable means is disposed in the first position, said inner element being brought into engagement with said other member at a point substantially coaxial with the centerline of the latter and urging said outer element away from said other member to thereby relieve the frictional torque applied to the latter.
Claim 7
Dependent Claim
27 words
The invention of claim 3: said first named means including spring means disposed between said housing and the other member yieldably urging the latter toward the rotor.
Claim 8
Dependent Claim
93 words
The invention of claim 5: said spring means having an annular opening therein coaxial with said members; said manually manipulable means including structure mounted in said opening for movement from a first position frictionally engaging said other member at a substantial distance from the axis of rotation of the latter to thereby exert a frictional torque thereon opposing rotation of the other member to a second position in which the structure is spaced from the other member to permit the other member to rotate relative to the one member thereby retracting the latter.
Claim 9
Dependent Claim
80 words
The invention of claim 3: said manually manipulable means including structure mounted in said housing for movement from a first position frictionally engaging said other member at a substantial distance from the axis of rotation of the latter to thereby exert a frictional torque thereon opposing rotation of the other member to a second position in which the structure is spaced from the other member to permit the latter to rotate relative to the one member thereby retracting the latter.
Claim 10
Dependent Claim
55 words
The invention of claim 7: and bolt means threadedly engaging said structure; one end of said bolt means engaging said other member substantially at the axis of rotation of the latter; said bolt urging said structure out of frictional engagement with the other member thereby relieving said torque to permit the other member to rotate.
Claim 11
Dependent Claim
55 words
The invention of claim 8: one end of said bolt engaging the end of the other member at a point along the axis of rotation of the latter, whereby the other member is urged away from the structure to relieve the frictional force between the structure and the other member when the bolt is rotated.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |