Patent US3877228A successfully refreshed from Google Patents.
US3877228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master cylinder assembly and reservoir for same
Assignee: Motors Liquidation Co
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Filing: 1974-04-19
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Granted: 1975-04-15
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Expires: 1994-04-19
Abstract
Abstract A master cylinder assembly combines a cast body with a stamped primary reservoir chamber. The primary reservoir is a single chamber which feeds fluids to two secondary reservoir chambers located in the master cylinder body. The fluids in the two secondary chambers are fed through appropriate compensating ports into the bore of the dual pressurizing chamber master cylinder. The master cylinder pistons function in the conventional manner to pressurize wheel brakes. The stamped reservoir is attached to the molded master cylinder body by shouldered tubular members which thread into the secondary reservoir chambers. One of the members which secures the primary reservoir body to the master cylinder body is a tubular member having an externally threaded section below the shoulder thereof which is threaded into the upper portion of one of the secondary reservoir chambers. It also has a centrally apertured head section which is of greater diameter than the externally threaded section so as to provide the shoulder therebetween which tightly holds the primary reservoir chamber bottom against the master cylinder body. A baffle plate is installed in the tubular member immediately adjacent the apertured head section. The baffle plate has a plurality of apertures adjacent its outer periphery and a solid center section which is in axial alignment with the cental aperture of the head section. This arrangement provides a tortuous fluid flow path between the compensation port of the associated secondary fluid reservoir chamber and the primary reservoir chamber, thereby preventing a squirt-like return of fluid from the associated fluid pressurizing chamber of the master cylinder directly into the primary fluid reservoir upon brake release.
Inventors
- 👤 Ronald L Shellhause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:55
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
267 words
A master cylinder reservoir arrangement comprising: a master cylinder body having a first fluid reservoir chamber formed therein with an open top, a bottom provided with a compensation port, and a cylindrical side wall having an internally threaded section adjacent the open top; a main fluid reservoir body defining a second fluid reservoir chamber having a side wall and a removable sealing top and a bottom, said bottom having an aperture therein positioned over said first fluid reservoir chamber and being at least as large as said first fluid reservoir chamber open top; and means securing said main fluid reservoir body to said master cylinder body comprising a tubular member having an externally threaded section and a centrally apertured head section of greater diameter than said externally threaded section to provide a shoulder therebetween and a centrally apertured cap, said externally threaded section extending through said aperture and threaded into said internally threaded section of said first fluid reservoir chamber cylindrical side wall with said shoulder tightly engaging said second fluid reservoir chamber bottom to retain said main fluid reservoir body on said master cylinder body, said head section having a baffle plate adjacent thereto and mounted within the upper portion of said tubular member, said baffle plate having a plurality of apertures adjacent the outer periphery thereof and a solid center section in axial alignment with the aperture of said cap, said plurality of apertures being also positioned adjacent the inner wall of said tubular member externally threaded section to provide a tortuous fluid flow path between said second fluid reservoir chamber and said compensation port.
Claim 2
Dependent Claim
267 words
A master cylinder reservoir arrangement comprising: a master cylinder body having a first fluid reservoir chamber formed therein with an open top, a bottom provided with a compensation port, and a cylindrical side wall having an internally threaded section adjacent the open top; a main fluid reservoir body defining a second fluid reservoir chamber having a side wall and a removable sealing top and a bottom, said bottom having an aperture therein positioned over said first fluid reservoir chamber and being at least as large as said first fluid reservoir chamber open top; and means securing said main fluid reservoir body to said master cylinder body comprising a tubular member having an externally threaded section and a centrally apertured head section of greater diameter than said externally threaded section to provide a shoulder therebetween and a centrally apertured cap, said externally threaded section extending through said aperture and threaded into said internally threaded section of said first fluid reservoir chamber cylindrical side wall with said shoulder tightly engaging said second fluid reservoir chamber bottom to retain said main fluid reservoir body on said master cylinder body, said head section having a baffle plate adjacent thereto and mounted within the upper portion of said tubular member, said baffle plate having a plurality of apertures adjacent the outer periphery thereof and a solid center section in axial alignment with the aperture of said cap, said plurality of apertures being also positioned adjacent the inner wall of said tubular member externally threaded section to provide a tortuous fluid flow path between said second fluid reservoir chamber and said compensation port.
Claim 3
Dependent Claim
265 words
In a master cylinder assembly having a master cylinder body and a fluid reservoir body, said master cylinder body having a bore therein, first and second pressurizing pistons reciprocably received in said bore and defining therewith first and second fluid pressurizing chambers; first and second secondary fluid reservoir chambers formed in said master cylinder body each having an open top and an internally threaded side wall and a bottom provided with compensation port means connecting with said bore; a primary fluid reservoir provided by said fluid reservoir body and having first and second apertures in the bottom thereof aligned with said first and second fluid reservoir chambers; first and second externally threaded securing means having fluid passages therethrough and shoulders thereon and respectively extending through said apertures and threaded into said first and second secondary fluid reservoir chambers with said shoulders tightly engaging the bottom of said primary fluid reservoir to hold said fluid reservoir body on said master cylinder body; said first securing means having a circumferentially apertured baffle mounted in said fluid passage thereof and a center apertured top portion positioning said baffle in the upper end of said fluid passage with the baffle and top portion apertures being out of direct alignment with each other and the apertures of said baffle being out of direct alignment with said compensation port means to prevent a direct line of fluid flow between said compensation port means and said primary fluid reservoir and thereby prevent a squirt-like return of fluid from said first fluid pressurizing chamber directly into said primary fluid reservoir upon brake release.
Claim 4
Dependent Claim
265 words
In a master cylinder assembly having a master cylinder body and a fluid reservoir body, said master cylinder body having a bore therein, first and second pressurizing pistons reciprocably received in said bore and defining therewith first and second fluid pressurizing chambers; first and second secondary fluid reservoir chambers formed in said master cylinder body each having an open top and an internally threaded side wall and a bottom provided with compensation port means connecting with said bore; a primary fluid reservoir provided by said fluid reservoir body and having first and second apertures in the bottom thereof aligned with said first and second fluid reservoir chambers; first and second externally threaded securing means having fluid passages therethrough and shoulders thereon and respectively extending through said apertures and threaded into said first and second secondary fluid reservoir chambers with said shoulders tightly engaging the bottom of said primary fluid reservoir to hold said fluid reservoir body on said master cylinder body; said first securing means having a circumferentially apertured baffle mounted in said fluid passage thereof and a center apertured top portion positioning said baffle in the upper end of said fluid passage with the baffle and top portion apertures being out of direct alignment with each other and the apertures of said baffle being out of direct alignment with said compensation port means to prevent a direct line of fluid flow between said compensation port means and said primary fluid reservoir and thereby prevent a squirt-like return of fluid from said first fluid pressurizing chamber directly into said primary fluid reservoir upon brake release.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |