US3879947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master cylinder reservoir
Assignee: Bendix Corp
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Filing: 1973-12-19
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Granted: 1975-04-29
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Expires: 1993-12-19
Abstract
Abstract A reservoir for use with a master cylinder in a vehicle having a first compartment separated from a second compartment by a wall. A well located at the axial center of the reservoir is connected by a first channel to the first compartment and by a second channel to the second compartment. A ledge located at the end of each channel and corresponding wing walls prevent a fixed amount of fluid in each compartment from flowing into the well. A sensor located in the well will inform an operator when the quantity of fluid retained in either compartment is insufficient to effectively supply a corresponding pressurizing piston in the master cylinder with sufficient fluid to operate the wheel brakes of the vehicle.
Inventors
- 👤 Robert F Gaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:33
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/225; B60T11/00; B60T11/10; B60T11/16; B60T11/20; B60T11/22; B60T11/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
246 words
In a master cylinder connected to a first wheel brake system and a second wheel brake system, reservoir means for supplying said first and second wheel brake systems with fluid to be pressurized in response to a brake applying force, said reservoir means comprising: a housing having a chamber therein, wall means for separating the chamber into a first compartment and a second compartment, each of said first and second compartments retaining a quantity of said fluid, said wall means having a well therein located at the center of gravity of said housing; channel means located in the first compartment and the second compartment for directing the fluid contained therein into said well; ledge means associated with said channel means and located at the center of gravity of each of said first and second compartments, said ledge means preventing a fixed quantity of fluid from entering said well when said master cylinder is rotated about said center of gravity to assure sufficient fluid is present in the master cylinder to supply at least one of said first and second wheel brake systems; and wing walls extending from said ledge means to the wall means for preventing said fluid from entering the channel after the master cylinder has rotated about its center of gravity through an angle whose tangent is equal to the height of the ledge divided by the distance between the center of gravity of the housing and one of the first and second compartments.
Claim 2
Dependent Claim
246 words
In a master cylinder connected to a first wheel brake system and a second wheel brake system, reservoir means for supplying said first and second wheel brake systems with fluid to be pressurized in response to a brake applying force, said reservoir means comprising: a housing having a chamber therein, wall means for separating the chamber into a first compartment and a second compartment, each of said first and second compartments retaining a quantity of said fluid, said wall means having a well therein located at the center of gravity of said housing; channel means located in the first compartment and the second compartment for directing the fluid contained therein into said well; ledge means associated with said channel means and located at the center of gravity of each of said first and second compartments, said ledge means preventing a fixed quantity of fluid from entering said well when said master cylinder is rotated about said center of gravity to assure sufficient fluid is present in the master cylinder to supply at least one of said first and second wheel brake systems; and wing walls extending from said ledge means to the wall means for preventing said fluid from entering the channel after the master cylinder has rotated about its center of gravity through an angle whose tangent is equal to the height of the ledge divided by the distance between the center of gravity of the housing and one of the first and second compartments.
Claim 3
Dependent Claim
47 words
The master cylinder, as recited in claim 1, wherein said wall means includes: baffle means located in the flow path of said fluid to impede the flow of the fluid into said well to avoid presenting said sensor with misinformation during rapid deceleration on a sloping roadway.
Claim 4
Dependent Claim
33 words
The master cylinder, as recited in claim 1, whErein said sensor means includes: readout means for informing an operator when the fluid level in the first and second compartments reaches the ledge height.
Claim 5
Dependent Claim
213 words
A reservoir means for use with a master cylinder in a vehicle, said reservoir supplying the master cylinder with a fluid to operate a first brake system and a second brake system in the vehicle, said reservoir means comprising: a housing having a chamber therein, said chamber having a first port connected to the first brake system and a second port connected to the second brake system; wall means for dividing said chamber into a first compartment and a second compartment, said first compartment and said second compartment retaining said fluid; well means located at the axial center of said housing; channel means located in said first compartment and said second compartment for communicating said fluid contained therein into said well means; ledge means associated with said channel means for establishing a barrier for retaining said fluid in one of said compartments during a rotation of said master cylinder away from a horizontal plane; and sensor means located in said well means for indicating the level of fluid therein, said ledge means preventing a fixed quantity of fluid from entering said well means during rotation of the housing about said axial center to assure that sufficient fluid is present in one of said first and second compartments for operating the corresponding brake system.
Claim 6
Dependent Claim
213 words
A reservoir means for use with a master cylinder in a vehicle, said reservoir supplying the master cylinder with a fluid to operate a first brake system and a second brake system in the vehicle, said reservoir means comprising: a housing having a chamber therein, said chamber having a first port connected to the first brake system and a second port connected to the second brake system; wall means for dividing said chamber into a first compartment and a second compartment, said first compartment and said second compartment retaining said fluid; well means located at the axial center of said housing; channel means located in said first compartment and said second compartment for communicating said fluid contained therein into said well means; ledge means associated with said channel means for establishing a barrier for retaining said fluid in one of said compartments during a rotation of said master cylinder away from a horizontal plane; and sensor means located in said well means for indicating the level of fluid therein, said ledge means preventing a fixed quantity of fluid from entering said well means during rotation of the housing about said axial center to assure that sufficient fluid is present in one of said first and second compartments for operating the corresponding brake system.
Claim 7
Dependent Claim
69 words
The reservoir means, as recited in claim 4, wherein said channel means further includes: wing wall means located in each compartment extending from said ledge means to said well means for preventing fluid from entering said channel means after the housing has rotated an angle whose tangent is equal to the height of the ledge means divided by one-half of the distance between said axial center and the housing.
Claim 8
Dependent Claim
38 words
The reservoir, as recited in claim 4, wherein said housing includes: passageways perpendicularly located in said channel means for providing total communication of the fluid in each compartment with the associated port upon rotation about the axial center.
Claim 9
Dependent Claim
38 words
The reservoir, as recited in claim 1, wherein said housing includes: passageways perpendicularly located in said channel means for providing total communication of the fluid in each compartment with the associated port upon rotation about the axial center.
Claim 10
Dependent Claim
47 words
The master cylinder, as recited in claim 4, wherein said wall means includes: baffle means located in the flow path of said fluid to impede the flow of the fluid into said well to avoid presenting said sensor with misinformation during rapid deceleration on a sloping roadway.
Claim 11
Dependent Claim
33 words
The master cylinder, as recited in claim 4, wherein said sensor means includes: readout means for informing an operator when the fluid level in the first and second compartments reaches the ledge height.
Claim 12
Dependent Claim
45 words
The reservoir means, as recited in claim 4, wherein said wall means includes: baffle means located in the channel means to impede the flow of the fluid into the well means to avoid presenting said sensor with misinformation during rapid deceleration on a sloping roadway.
Claim 13
Dependent Claim
212 words
A reservoir means for use with a master cylinder in a vehicle, said reservoir supplying the master cylinder with a fluid to operate a first brake system and a second brake system in the vehicle, said reservoir means comprising: a housing having a chamber therein, said chamber having a first port connected to the first brake system and a second port connected to the second brake system; wall means for dividing said chamber into a first compartment and a second compartment, said first compartment and said second compartment retaining said fluid; well means located at the axial center of said housing; channel means located in said first compartment and said second compartment for communicating said fluid contained therein into said well means; ledgE means associated with said channel means for establishing a barrier for retaining said fluid in one of said compartments during movement of the master cylinder away from a horizontal plane; and sensor means associated with said well means for indicating the level of fluid therein, said ledge means preventing a fixed quantity of fluid from entering said well means during rotation of the housing about said axial center to assure that sufficient fluid is present in one of said first and second compartments for operating the corresponding brake system.
Claim 14
Dependent Claim
212 words
A reservoir means for use with a master cylinder in a vehicle, said reservoir supplying the master cylinder with a fluid to operate a first brake system and a second brake system in the vehicle, said reservoir means comprising: a housing having a chamber therein, said chamber having a first port connected to the first brake system and a second port connected to the second brake system; wall means for dividing said chamber into a first compartment and a second compartment, said first compartment and said second compartment retaining said fluid; well means located at the axial center of said housing; channel means located in said first compartment and said second compartment for communicating said fluid contained therein into said well means; ledgE means associated with said channel means for establishing a barrier for retaining said fluid in one of said compartments during movement of the master cylinder away from a horizontal plane; and sensor means associated with said well means for indicating the level of fluid therein, said ledge means preventing a fixed quantity of fluid from entering said well means during rotation of the housing about said axial center to assure that sufficient fluid is present in one of said first and second compartments for operating the corresponding brake system.
Claim 15
Dependent Claim
69 words
The reservoir means, as recited in claim 11, wherein said channel means further includes: wing wall means located in each compartment extending from said ledge means to said well means for preventing fluid from entering said channel means after the housing has rotated an angle whose tangent is equal to the height of the ledge means divided by one-half of the distance between said axial center and the housing.
References Cited (Backward Citations)
US2717935A
Cited
US3147596A
Cited
US3593271A
Cited
US3560918A
Cited
US3603926A
Cited
US3744513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |