US3836206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic unit
Assignee: Robert Bosch GmbH
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Filing: 1973-09-28
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Granted: 1974-09-17
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Expires: 1993-09-28
Abstract
Abstract An hydraulic unit for supplying two separate supply circuits comprises two pumps connected to a reservoir, both pumpshaving output lines, piston members for detecting the output pressures and a normally closed valve connecting the output lines and operable in response to detected output pressures which are below a predetermined pressure.
Inventors
- 👤 H Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148; B60T17/00; B60T17/06; B60T17/18; B60T17/22; B60T17/225; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/404; B60T8/88; B60T8/92; B60T8/94; F15B1/00; F15B1/02; F15B1/027; F15B1/033; F15B18/00; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20576; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41509; F15B2211/41518; F15B2211/42; F15B2211/426; F15B2211/60; F15B2211/625; F15B2211/63; F15B2211/6303; F15B2211/6306; F15B2211/6309; F15B2211/665; F15B2211/6651; F15B2211/6653; F15B2211/70; F15B2211/71; F15B2211/7142; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2572
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A hydraulic unit for supplying two separate supply circuits comprising a reservoir, two pumps connected to said reservoir, an output line connected to each said pump, detecting means for detecting the output pressure of each said output line and a normally closed valve connecting said output lines and responsive to said detecting means for opening communication between said output lines if said detecting means detects a pressure in one of said output lines which is below a predetermined pressure.
Claim 2
Dependent Claim
79 words
A hydraulic unit for supplying two separate supply circuits comprising a reservoir, two pumps connected to said reservoir, an output line connected to each said pump, detecting means for detecting the output pressure of each said output line and a normally closed valve connecting said output lines and responsive to said detecting means for opening communication between said output lines if said detecting means detects a pressure in one of said output lines which is below a predetermined pressure.
Claim 3
Dependent Claim
19 words
A unit as defined in claim 1, and further comprising a hydraulic store connected into each said output line.
Claim 4
Dependent Claim
15 words
A unit as defined in claim 2, wherein said hydraulic stores comprise small piston stores.
Claim 5
Dependent Claim
30 words
A unIt as defined in claim 2, wherein said normally closed valve comprises a magnetic valve and said detecting means comprise a switching means associated with each said output line.
Claim 6
Dependent Claim
17 words
A unit as defined in claim 4, and further comprising a common drive for both said pumps.
Claim 7
Dependent Claim
20 words
A unit as defined in claim 4 and further comprising warning indication means responsive to actuation of said magnetic valve.
Claim 8
Dependent Claim
29 words
A unit as defined in claim 4, wherein said switching means comprise switches actuated in dependence on the amount of fluid in an associated one of said hydraulic stores.
Claim 9
Dependent Claim
39 words
A unit as defined in claim 7, and further comprising logic switching elements connecting said switches to drive means for said pumps for cutting of drive from said pumps when said hydraulic stores contain a predetermined amount of fluid.
Claim 10
Dependent Claim
24 words
A unit as defined in claim 8, and further comprising means for maintaining said magnetic valve open for a predetermined period after its actuation.
Claim 11
Dependent Claim
48 words
A unit as defined in claim 7, and further comprising detecting means for detecting the amount of fluid in said reservoir and means responsive to said detecting means for preventing actuation of said magnetic valve when the amount of fluid in said reservoir falls beyond a predetermined amount.
Claim 12
Dependent Claim
37 words
A unit as defined in claim 10, in which the said reservoir is partly divided in two parts associated with the two pumps, the divided parts being effective on reaching a predetermined minimum amount of brake fluid.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |