US3889467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accumulator arrangement for a booster brake mechanism
Assignee: MIDBRAKE Corp
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Filing: 1974-06-24
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Granted: 1975-06-17
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Expires: 1994-06-24
Abstract
Abstract A hydraulic booster is provided with a pressure responsive dump valve and check valve arrangement which permits the booster to employ an accumulator ideally responsive to automotive brake applications. The check valve is operable to automatically charge the accumulator when the booster fluid source is called upon to supply fluid at operating pressure to the booster or other devices. The dump valve includes a stepped piston arrangement biased into a closed position by backpressure from the fluid source and operable by accumulator pressure to automatically dump the accumulated charge to the booster when source backpressure drops below a predetermined value.
Inventors
- 👤 Herman M Huffman
- 👤 Kenneth B Swanson
- 👤 Kenneth D Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:05
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143; B60T13/144; B60T13/148
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
309 words
A booster mechanism operable by a source of fluid capable of supplying minimum pressure and a higher operating pressure to the booster mechanism, said mechanism comprising: a housing having a longitudinally extending cavity therein, an input member extending into said cavity at one end thereof and an output member extending from said cavity at its opposite end; piston means between said input and output members for moving said output member in response to movement of said input member, said piston means including a power chamber at one side thereof; inlet and outlet valve means associated with said input member within said cavity and operable upon inward movement of said input member to provide fluid communication between said source at operating pressure and said power chamber for actuating said piston means; accumulator chamber means associated with said housing operable to store a predetermined volume of fluid; dump valve means interposed between said accumulator chamber means and said source of pressure and check valve means associated with said dump vAlve means; said check valve means operable to provide fluid communication between said source and said accumulator chamber means for charging said accumulator chamber when said source is at operating pressure while preventing fluid communication between said accumulator chamber means and said source when the fluid within accumulator chamber means is at a pressure greater than said minimum pressure of said source, said dump valve means operably biased by the pressure from the fluid within said accumulator chamber means towards a first position and operably biased by the pressure from said source towards a second position; and first passage means within said housing providing fluid communication between said inlet and outlet valving means and said accumulator chamber means when said dump valve means is in its first position while preventing communication therebetween when said dump valve means is in its second position.
Claim 2
Dependent Claim
309 words
A booster mechanism operable by a source of fluid capable of supplying minimum pressure and a higher operating pressure to the booster mechanism, said mechanism comprising: a housing having a longitudinally extending cavity therein, an input member extending into said cavity at one end thereof and an output member extending from said cavity at its opposite end; piston means between said input and output members for moving said output member in response to movement of said input member, said piston means including a power chamber at one side thereof; inlet and outlet valve means associated with said input member within said cavity and operable upon inward movement of said input member to provide fluid communication between said source at operating pressure and said power chamber for actuating said piston means; accumulator chamber means associated with said housing operable to store a predetermined volume of fluid; dump valve means interposed between said accumulator chamber means and said source of pressure and check valve means associated with said dump vAlve means; said check valve means operable to provide fluid communication between said source and said accumulator chamber means for charging said accumulator chamber when said source is at operating pressure while preventing fluid communication between said accumulator chamber means and said source when the fluid within accumulator chamber means is at a pressure greater than said minimum pressure of said source, said dump valve means operably biased by the pressure from the fluid within said accumulator chamber means towards a first position and operably biased by the pressure from said source towards a second position; and first passage means within said housing providing fluid communication between said inlet and outlet valving means and said accumulator chamber means when said dump valve means is in its first position while preventing communication therebetween when said dump valve means is in its second position.
Claim 3
Dependent Claim
52 words
The booster mechanism of claim 1 wherein said dump valve means is operable biased into said second position when said pressure from said source is at or greater than said minimum pressure while said dump valve means is operably biased into said first position when said pressure from said source is zero.
Claim 4
Dependent Claim
53 words
The booster mechanism of claim 2 further including second passage means within said housing providing fluid communication between said power chamber and said dump valve means operable to effect quick movement of said dump valve means from its second to its first position when said pressure from said source is reduced to zero.
Claim 5
Dependent Claim
146 words
The booster mechanism of claim 3 wherein: said dump valve means includes said housing having a cylindrically-stepped passage comprising a first smaller opening contiguous with a second larger opening, said second larger opening adapted to be in fluid communication with said source and said smaller opening in fluid communication with said accumulator chamber means; a cylindrically-stepped dump valve disposed within said cylindrically-stepped passage, said dump valve having a first smaller piston portion in sealing engagement with said first smaller opening and a second larger piston portion in sealing engagement with said second larger opening; dump valve means at the end of said first smaller piston portion effective to prevent fluid communication between said accumulator chamber means and said passage means when said dump valve is in said second position; and said first smaller piston portion sized in predetermined relationship to said second larger piston diameter portion.
Claim 6
Dependent Claim
127 words
Booster mechanism of claim 4 wherein: said check valve means includes said dump valve having a cylindrically-stepped passage extending therethrough, said passage having an orifice opening extending from the end of said large piston portion, a larger second opening contiguous with said first orifice opening and a third larger opening extending through said small piston portion and contiguous with said intermediate opening, the juncture of said third and second openings defining a valve seat; a cylindrical valve element disposed in said third opening and having a conical end and a plurality of fluted passages circumferentially spaced about its periphery; and biasing means within said third opening for urging said conical end of said valve element into engagement with said valve seat between said second and third openings.
Claim 7
Dependent Claim
50 words
The booster mechanism of claim 5 wherein: said second passage means includes said housing having a fast response passageway communicating at one end with said power chamber and at its other end with said large piston portion adjacent the juncture of said large piston portion with said small piston portion.
Claim 8
Dependent Claim
235 words
In a hydraulic brake booster operable by a source of fluid delivered from a pump supplying varying pressures between minimum and maximum values, said booster having a housing with a central cavity extending therethrough, an input member extending into Said cavity, an output member extending from said cavity, piston means between said input and output members for moving said output member in response to movement of said input member and including a power chamber within said cavity, inlet and outlet valve means operable in response to movement of said input member to provide varying degrees of fluid communication between said power chamber and said source, the improvement comprising: accumulator chamber means associated with said housing and operable to store a predetermined volume of fluid; a two-position dump valve interposed between said source and said accumulator chamber, said dump valve in its first position providing fluid communication between said accumulator chamber means and said inlet and outlet valving means and in its second position preventing fluid communication between said accumulator chamber means and said inlet and outlet valving means; and check valve means associated with said dump valve operable to provide fluid communication between said source and said accumulator chamber means when said source is at a pressure greater than said minimum value and preventing fluid communication between said source and said accumulator chamber means when said source is at or less than said minimum pressure.
Claim 9
Dependent Claim
235 words
In a hydraulic brake booster operable by a source of fluid delivered from a pump supplying varying pressures between minimum and maximum values, said booster having a housing with a central cavity extending therethrough, an input member extending into Said cavity, an output member extending from said cavity, piston means between said input and output members for moving said output member in response to movement of said input member and including a power chamber within said cavity, inlet and outlet valve means operable in response to movement of said input member to provide varying degrees of fluid communication between said power chamber and said source, the improvement comprising: accumulator chamber means associated with said housing and operable to store a predetermined volume of fluid; a two-position dump valve interposed between said source and said accumulator chamber, said dump valve in its first position providing fluid communication between said accumulator chamber means and said inlet and outlet valving means and in its second position preventing fluid communication between said accumulator chamber means and said inlet and outlet valving means; and check valve means associated with said dump valve operable to provide fluid communication between said source and said accumulator chamber means when said source is at a pressure greater than said minimum value and preventing fluid communication between said source and said accumulator chamber means when said source is at or less than said minimum pressure.
Claim 10
Dependent Claim
58 words
The hydraulic booster of claim 7 wherein said dump valve includes a cylindrically-stepped piston sealingly slidable within a cylindrically-stepped passage within said housing, said piston having a larger effective area at one end thereof than the other, said larger area adapted to be exposed to said source and said smaller area being exposed to said accumulator chamber means.
Claim 11
Dependent Claim
75 words
The hydraulic booster of claim 7 wherein: said dump valve piston has a bore extending therethrough, said bore being stepped to define an annular valve seat therein; and said check valve means including a resiliently biased, generally cylindrical valve member disposed within said bore, said valve member having a cone-shaped end adapted to sealingly engage said annular valve seat and at least one longitudinally-extending flute formed at its periphery to permit fluid to pass therethrough.
Claim 12
Dependent Claim
140 words
The hydraulic booster of claim 9 wherein: said dump valve piston is further defined to include a first smaller piston portion depending from a larger diameter piston portion, each piston portion sealingly disposed in respectively sized bores formed within said housing, said bore receiving said smaller piston portion having an annular shoulder defining a dump valve seat adjacent the end of said smaller piston portion, said smaller piston portion end sealingly contacting said annular shoulder valve seat when said dump valve is in its second position; and said housing having a passage in fluid communication with said inlet and outlet valve means at one end thereof and in fluid communication with said smaller bore receiving said smaller piston portion so as to be in fluid communication with said accumulator chamber means when said dump valve is in its first position.
Claim 13
Dependent Claim
66 words
The hydraulic booster of claim 10 wherein said housing has a second passage in fluid communication at one end with said power chamber and in fluid communication at its other end with the side of said larger piston portion defined by the juncture between said larger and smaller piston portions whereby the response time of said dump valve during movement between its respective positions is increased.
Claim 14
Dependent Claim
54 words
The hydraulic booster of claim 11 wherein: said accumulator chamber means includes said housing having a cylindrical blind chamber therein, and a third passage in fluid communication with said blind chamber at one end and forming said annular shoulder valve seat at its other end; and biased piston means disposed within said blind chamber.
Claim 15
Dependent Claim
94 words
The hydraulic booster of claim 12 wherein said piston means includes a retention member having a cylindrical portion with an axial end face surface disposed within said blind chamber at a predetermIned distance, a larger cylindrical base portion depending from said cylindrical portion and forming an annular seat at the juncture therebetween, retention means to secure said base portion within said opening, a cylindrical piston sealingly disposed within said opening between said end wall and said axial surface, and spring means contained between said annular seat formed in said base portion and said piston.
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |