US3759147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm brake actuator
Assignee: Certain Teed Saint Gobain Insulation Corp
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Filing: 1971-02-24
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Granted: 1973-09-18
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Expires: 1991-02-24
Abstract
Abstract An improved service brake air diaphragm chamber having two diaphragms placed close to each other therewithin and held in position inside the service chamber by a single clamp band, the outer of said diaphragms having an air hose fitting, whereby air pressure may be fed through said fitting to the space between the diaphragms by means of a flexible air hose connected to the fitting and an inlet port on the outer pressure plate of the service chamber, the service chamber having its rear cover or pressure plate made with a cavity behind the outer diaphragm for lodging the half-coil flexible hose and a second inlet port outboard of the outboard diaphragm to feed air pressure outboard thereof. Service brake locking means including a push rod made with sawtooth grooves on a length thereof spaced from a push rod disc on one end thereof abutting the inner of said two diaphragms, the saw-tooth grooves operating as a ratchet to be held in a locked position by means of a spring actuated pawl, when the diaphragms have transmitted their force to the push rod (locking the brake in on position), the pawl being part of a piston which, on one side thereof, is actuated by spring force and the other side actuated by air pressure; The combination of the service brake air diaphragm chamber with two diaphragms and the air hose fitting with, as a first option, an outboard spring emergency and parking brake unit and, as a second option, an inboard spring emergency and parking brake power unit, neither of these two latter forms employing a lock mechanism.
Inventors
- 👤 C Johnsson
- 👤 K Swander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:45
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/16; B60T17/083; F; F16; F16D; F16D2127/00; F16D2127/06; F16D2129/00; F16D2129/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
In a service air brake chamber, in combination, a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms together peripherally engaged by one another and said service chamber defining member flanges, a first pressurized fluid input between a first one of said diaphragms and a first one of said chamber defining members next thereto, and a second pressurized fluid input between said two diaphragms through an opening in the central portion of said first diaphragm, and resilient conduict means within said service brake chamber communicating between an opening in said first chamber defining member and the central opening in the first diaphragm and comprising said second pressurized fluid input.
Claim 2
Dependent Claim
121 words
In a service air brake chamber, in combination, a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms together peripherally engaged by one another and said service chamber defining member flanges, a first pressurized fluid input between a first one of said diaphragms and a first one of said chamber defining members next thereto, and a second pressurized fluid input between said two diaphragms through an opening in the central portion of said first diaphragm, and resilient conduict means within said service brake chamber communicating between an opening in said first chamber defining member and the central opening in the first diaphragm and comprising said second pressurized fluid input.
Claim 3
Dependent Claim
49 words
A chamber as in claim 1 wherein the second pressurized fluid input through the first diaphragm includes a resilient hose movable with the perforated first diaphragm to and fro within the chamber and communicating inside of said chamber through the first defining member next to the perforated first diaphragm.
Claim 4
Dependent Claim
159 words
In a service air brake chamber, in combination, a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms peripherally engaged by said service chamber defining member flanges, a first pressurized fluid input between one of said diaphragms and the one of said chamber defining members next thereto, and a second pressurized fluid input between said two diaphragms through an opening in the central portion of one of said diaphragms, the pressurized fluid input through the diaphragm incluDing a resilient hose movable with the perforated diaphragm to and fro within the chamber and communicating outside of said chamber through the defining member next to the perforated diaphragm, the defining member next the perforated diaphragm recessed to receive the hose, a circumferential shelf provided in said member and a sealing plate connected to said perforated diaphragm adapted to rest against said shelf to seal the recess containing the hose.
Claim 5
Dependent Claim
159 words
In a service air brake chamber, in combination, a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms peripherally engaged by said service chamber defining member flanges, a first pressurized fluid input between one of said diaphragms and the one of said chamber defining members next thereto, and a second pressurized fluid input between said two diaphragms through an opening in the central portion of one of said diaphragms, the pressurized fluid input through the diaphragm incluDing a resilient hose movable with the perforated diaphragm to and fro within the chamber and communicating outside of said chamber through the defining member next to the perforated diaphragm, the defining member next the perforated diaphragm recessed to receive the hose, a circumferential shelf provided in said member and a sealing plate connected to said perforated diaphragm adapted to rest against said shelf to seal the recess containing the hose.
Claim 6
Dependent Claim
211 words
In a service air brake chamber wherein a diaphragm is peripherally engaged by opposed flanges of paired members defining said service chamber therebetween, with a pressurized fluid input between the diaphragm and the outboard one of said chamber defining members, the flanges of the chamber defining members with the periphery of the diaphragm engaged therebetween removably and substantially circumferentially gripped by a clamp band, a push rod operably connected with said diaphragm on the side opposite that pressurized by said fluid input extending out of the other one of said defining members and moving in and out corresponding to the action of the diaphragm and a diaphragm return spring within the non-pressurized segment of the service chamber, the improvement which comprises: a length of said push rod having teeth formed therein where said push rod moves in and out of said service chamber, a movable wall normally driven by resilient means toward the push rod and carrying a toothed member adapted to engage said teeth on the push rod, and means for moving said movable wall to a position radially away from said push rod, means for pivotally mounting said toothed member on the movable wall and including a spring to bias the member to one extremity of its pivotal movement.
Claim 7
Dependent Claim
211 words
In a service air brake chamber wherein a diaphragm is peripherally engaged by opposed flanges of paired members defining said service chamber therebetween, with a pressurized fluid input between the diaphragm and the outboard one of said chamber defining members, the flanges of the chamber defining members with the periphery of the diaphragm engaged therebetween removably and substantially circumferentially gripped by a clamp band, a push rod operably connected with said diaphragm on the side opposite that pressurized by said fluid input extending out of the other one of said defining members and moving in and out corresponding to the action of the diaphragm and a diaphragm return spring within the non-pressurized segment of the service chamber, the improvement which comprises: a length of said push rod having teeth formed therein where said push rod moves in and out of said service chamber, a movable wall normally driven by resilient means toward the push rod and carrying a toothed member adapted to engage said teeth on the push rod, and means for moving said movable wall to a position radially away from said push rod, means for pivotally mounting said toothed member on the movable wall and including a spring to bias the member to one extremity of its pivotal movement.
Claim 8
Dependent Claim
273 words
In a service air brake chamber wherein a diaphragm is peripherally engaged by opposed flanges of paired members defining said service chamber therebetween, with a pressurized fluid input between the diaphragm and the outboard one of said chamber defining members, the flanges of the chamber defining members with the periphery of the diaphragm engaged therebetween removably and substantially circumferentially gripped by a clamp band, a push rod operably connected with said diaphragm on the side opposite that pressurized by said fluid input extending out of the other one of said defining members and moving in and out corresponding to the action of the diaphragm and a diaphragm return spring within the non-pressurized segment of the service chamber, the improvement which comprises: a length of said push rod having teeth formed therein where said push rod moves in and out of said service chamber, a movable wall normally driven by resilient means toward the push rod and carrying a toothed member for engaging said teeth on the push rod, and means for moving said movable wall to a position radially away from said push rod, the push rod being hollow, a rod connected received within the hollow center of said push rod and having an enlarged head thereon, whereby to be picked up by means of the hollow push rod when the latter moves outwardly and into the service chamber, and resilient means provided within the hollow push rod acting between the connection of the push rod to the diaphragm and the rod within the push rod to provide a resilient connection under return forces transmitted inwardly of the service chamber toward the diaphragm.
Claim 9
Dependent Claim
273 words
In a service air brake chamber wherein a diaphragm is peripherally engaged by opposed flanges of paired members defining said service chamber therebetween, with a pressurized fluid input between the diaphragm and the outboard one of said chamber defining members, the flanges of the chamber defining members with the periphery of the diaphragm engaged therebetween removably and substantially circumferentially gripped by a clamp band, a push rod operably connected with said diaphragm on the side opposite that pressurized by said fluid input extending out of the other one of said defining members and moving in and out corresponding to the action of the diaphragm and a diaphragm return spring within the non-pressurized segment of the service chamber, the improvement which comprises: a length of said push rod having teeth formed therein where said push rod moves in and out of said service chamber, a movable wall normally driven by resilient means toward the push rod and carrying a toothed member for engaging said teeth on the push rod, and means for moving said movable wall to a position radially away from said push rod, the push rod being hollow, a rod connected received within the hollow center of said push rod and having an enlarged head thereon, whereby to be picked up by means of the hollow push rod when the latter moves outwardly and into the service chamber, and resilient means provided within the hollow push rod acting between the connection of the push rod to the diaphragm and the rod within the push rod to provide a resilient connection under return forces transmitted inwardly of the service chamber toward the diaphragm.
Claim 10
Dependent Claim
241 words
A brake actuating device having spring emergency and parking functions and operable connection with the braking mechanism of a vehicle, comprising, a closed housing divided into inner and outer compartments, a pair of flexible diaphragms together peripherally secured by one another and a pair of opposed circumferential flanges in the outer compartment, a first pressurized fluid input between the outboard one of said diaphragms and the outboard end of the outer compartment, a second preSsurized fluid input between said two diaphragms through the central portion of the outboard one of said diaphragms, conduit means within the outer compartment communicating between an opening in the outer comparment outer compartment and the central opening in the outboard diaphragm and comprising said second pressurized fluid input, a brake operating rod surmounted by a diaphragm abutment plate extending axially through the inner and outer compartments and having attachment to the braking mechanism, a movable wall mounted within the inner compartment equipped with a tubular axial extension surrounding and having abutting engagement at its inner end with said rod, an annular member forming the partition between the inner and outer compartments, a power compression spring unit between the said annular member and movable wall, a rod return compression spring between the diaphragm abutment plate and one of said annular member and movable wall, and an air inlet for introducing compressed air to the inner compartment between the movable wall and the inner end of the housing.
Claim 11
Dependent Claim
241 words
A brake actuating device having spring emergency and parking functions and operable connection with the braking mechanism of a vehicle, comprising, a closed housing divided into inner and outer compartments, a pair of flexible diaphragms together peripherally secured by one another and a pair of opposed circumferential flanges in the outer compartment, a first pressurized fluid input between the outboard one of said diaphragms and the outboard end of the outer compartment, a second preSsurized fluid input between said two diaphragms through the central portion of the outboard one of said diaphragms, conduit means within the outer compartment communicating between an opening in the outer comparment outer compartment and the central opening in the outboard diaphragm and comprising said second pressurized fluid input, a brake operating rod surmounted by a diaphragm abutment plate extending axially through the inner and outer compartments and having attachment to the braking mechanism, a movable wall mounted within the inner compartment equipped with a tubular axial extension surrounding and having abutting engagement at its inner end with said rod, an annular member forming the partition between the inner and outer compartments, a power compression spring unit between the said annular member and movable wall, a rod return compression spring between the diaphragm abutment plate and one of said annular member and movable wall, and an air inlet for introducing compressed air to the inner compartment between the movable wall and the inner end of the housing.
Claim 12
Dependent Claim
274 words
In combination, a housing, said housing having inner and outer ends with respect to a vehicle brake mechanism, one end of the housing closed by an inner wall member having a central opening therethrough, the other end of said housing closed by an outer wall member, a movable wall within said housing with the outer face thereof next the outer wall member of said housing, a rod connected at one end thereof centrally of said movable wall, extending inwardly of the latter and having a sliding fit through the inner wall member central opening, an air inlet into said housing between the inner wall member and the inner face of the movable wall, whereby to permit pressurization of a movable wall pressurization chamber defined between said movable wall and the inner wall member, a service air brake chamber inboard of said housing with the inner wall member of the housing constituting at least in a part one of a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms together peripherally engaged by one another and said service chamber defining member flanges, a first pressurized fluid input into the space between the outboard one of said diaphragm and the outer service air brake chamber defining member, a second pressurized fluid input between the two diaphragms through the central portion of the outboard one of said diaphragms, and resilient conduit means within the outer compartment communicating between an opening in the outer one of said service chamber defining members and the central opening in the outboard diaphragm and comprising said second pressurized fluid input.
Claim 13
Dependent Claim
274 words
In combination, a housing, said housing having inner and outer ends with respect to a vehicle brake mechanism, one end of the housing closed by an inner wall member having a central opening therethrough, the other end of said housing closed by an outer wall member, a movable wall within said housing with the outer face thereof next the outer wall member of said housing, a rod connected at one end thereof centrally of said movable wall, extending inwardly of the latter and having a sliding fit through the inner wall member central opening, an air inlet into said housing between the inner wall member and the inner face of the movable wall, whereby to permit pressurization of a movable wall pressurization chamber defined between said movable wall and the inner wall member, a service air brake chamber inboard of said housing with the inner wall member of the housing constituting at least in a part one of a pair of members defining said service air brake chamber therebetween and having continuous, opposed, circumferential flanges thereon, a pair of diaphragms together peripherally engaged by one another and said service chamber defining member flanges, a first pressurized fluid input into the space between the outboard one of said diaphragm and the outer service air brake chamber defining member, a second pressurized fluid input between the two diaphragms through the central portion of the outboard one of said diaphragms, and resilient conduit means within the outer compartment communicating between an opening in the outer one of said service chamber defining members and the central opening in the outboard diaphragm and comprising said second pressurized fluid input.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |