US3572845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pressure rate-of-change control
Assignee: Bendix Corp
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Filing: 1969-01-13
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Granted: 1971-03-30
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Expires: 1989-01-13
Abstract
Abstract The subject invention relates to a hydraulic pressure rate-ofchange control device, which is interposed between a brake assembly and a source of pressurizable hydraulic fluid for actuating the brake assembly, to protect against permanent damage to the brake assembly resulting from a sudden or panic pressurization of said hydraulic fluid.
Inventors
- 👤 Donald D Johannesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T11/34; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A hydraulic pressure rate-of-change control device interposed in a series flow relationship with a pressurizable hydraulic line, said hydraulic pressure rate-of-change control device comprising: a housing having an inlet, an outlet, and defining a stepped chamber therewithin presenting larger and smaller diameter portions with a shoulder therebetween; a baffle member slidably disposed in said larger diameter portion of said chamber; resilient means within said chamber for biasing said baffle means away from said shoulder; said baffle member including a plurality of peripheral axial conduits and another conduit through the central portion of said member; said baffle member having a plurality of peripheral axial conduits and another axial conduit extending through the central section of said baffle member; said peripheral conduits being aligned with said shoulder whereby upon pressurization of said hydraulic lines the force due to fluid pressure acting upon said baffle member to drive the latter into engagement with said shoulder to close said peripheral conduits; and said another conduit remaining open after said baffle Member engages said shoulder to permit limited flow of fluid through the baffle member in response to said pressurization of the brake lines.
Claim 2
Dependent Claim
189 words
A hydraulic pressure rate-of-change control device interposed in a series flow relationship with a pressurizable hydraulic line, said hydraulic pressure rate-of-change control device comprising: a housing having an inlet, an outlet, and defining a stepped chamber therewithin presenting larger and smaller diameter portions with a shoulder therebetween; a baffle member slidably disposed in said larger diameter portion of said chamber; resilient means within said chamber for biasing said baffle means away from said shoulder; said baffle member including a plurality of peripheral axial conduits and another conduit through the central portion of said member; said baffle member having a plurality of peripheral axial conduits and another axial conduit extending through the central section of said baffle member; said peripheral conduits being aligned with said shoulder whereby upon pressurization of said hydraulic lines the force due to fluid pressure acting upon said baffle member to drive the latter into engagement with said shoulder to close said peripheral conduits; and said another conduit remaining open after said baffle Member engages said shoulder to permit limited flow of fluid through the baffle member in response to said pressurization of the brake lines.
Claim 3
Dependent Claim
17 words
A baffle means as recited in claim 1, wherein said concentric axial conduit includes a diverging portion.
Claim 4
Dependent Claim
187 words
A hydraulic pressure rate-of-change control device interposed in a series flow relationship with a pressurizable hydraulic line, said hydraulic pressure rate-of-change control device comprising: a housing member including a chamber therein having on one end an outlet and on its other end a sealing surface extending radially therefrom; a cover member operably connected to said housing member; said cover member including an inner chamber having on one end an inlet and on its other end an abutment surface extending radially therefrom; said cover member further including an outer chamber extending axially away from said abutment surface; a baffle means, including axial conduits therethrough, slidably disposed in said outer chamber; and a resilient means interposed between said housing member and said baffle means to bias said baffle means into engagement with said abutment surface to maintain said axial conduits in a normally open position; and said baffle means responsive to pressurization of said hydraulic line to compress said resilient means so as to engage said sealing surface and partially close said axial conduits to reduce the rate-of-change of said outlet hydraulic pressure relative to said inlet hydraulic pressure.
Claim 5
Dependent Claim
187 words
A hydraulic pressure rate-of-change control device interposed in a series flow relationship with a pressurizable hydraulic line, said hydraulic pressure rate-of-change control device comprising: a housing member including a chamber therein having on one end an outlet and on its other end a sealing surface extending radially therefrom; a cover member operably connected to said housing member; said cover member including an inner chamber having on one end an inlet and on its other end an abutment surface extending radially therefrom; said cover member further including an outer chamber extending axially away from said abutment surface; a baffle means, including axial conduits therethrough, slidably disposed in said outer chamber; and a resilient means interposed between said housing member and said baffle means to bias said baffle means into engagement with said abutment surface to maintain said axial conduits in a normally open position; and said baffle means responsive to pressurization of said hydraulic line to compress said resilient means so as to engage said sealing surface and partially close said axial conduits to reduce the rate-of-change of said outlet hydraulic pressure relative to said inlet hydraulic pressure.
Claim 6
Dependent Claim
66 words
A hydraulic pressure rate-of-change control device as recited in claim 3, wherein said outlet comprises: a first conduit connected on one end to said chamber; a diverging frustroconical portion having inner and outer diameters; said frustroconical portion having its inner diameter connected to the other end of said first conduit; and a second conduit connected on one end to said outer diameter of said frustroconical portion.
Claim 7
Dependent Claim
17 words
A hydraulic pressure rate-of-change control device as recited in claim 3, wherein said abutment surface is annular.
Claim 8
Dependent Claim
19 words
A hydraulic pressure rate-of-change control device as recited in claim 3, wherein said resilient means comprises a coil spring.
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |