Patent US4134293A successfully refreshed from Google Patents.
US4134293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure differential indicating apparatus for a hydraulic measuring bridge and its associated measuring piston
Assignee: Robert Bosch GmbH
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Filing: 1977-03-18
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Granted: 1979-01-16
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Expires: 1997-03-18
Abstract
Abstract The invention relates to pressure differential indicating apparatus in a hydraulic measuring bridge which includes a measuring chamber that is provided with a valve means that emits a throughflow quantity into the chamber to be measured thereby and a further valve element for discharging the throughflow quantity from said chamber. The measuring chamber is associated with a pressure differential sensor having a movable wall which controls the volume of the measuring chamber and is acted upon by the pressure of a measuring medium that pulsates at slightly different pressures. Further, the pressure differential sensor is provided with a signal transmitter for controlling the measuring chamber volume and includes a cylinder having a wall provided with a piston means associated with a piston rod. The piston rod has one free end thereof arranged to cooperate with the signal transmitter and the piston means further includes a sealing means having an extent which cooperates with the cylinder wall to form an annular seal therebetween.
Inventors
- 👤 Dieter Handtmann
- 👤 Gotthold Raabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:56
CPC Classifications
G; G01; G01L; G01L13/00; G01L13/02; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01L9/00; G01L9/0089
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
Pressure differential responsive apparatus in a hydraulic measuring bridge including a measuring chamber that is provided with a standard valve means which emits a known throughflow quantity into said chamber and a further valve means being tested for discharging the throughflow quantity from said chamber to be measured thereby, said measuring chamber being associated with a pressure differential sensor having a movable wall one side of which is in communication with said chamber and the other side of which is exposed to a controlled pressure, said pressure differential sensor being provided with a signal transmitter responsive to movement of the movable wall for controlling the flow through the measuring chamber by adjusting one of said valve means, means for indicating the adjustment of said valve means, further characterized by said pressure differential sensor including a cylinder having a wall and further provided with a piston means associated with a piston rod, said piston rod having one free end thereof arranged to cooperate with said signal transmitter and said piston means further including confronting sealing means having an extent which cooperates with said cylinder wall to form an annular seal therebetween.
Claim 2
Dependent Claim
190 words
Pressure differential responsive apparatus in a hydraulic measuring bridge including a measuring chamber that is provided with a standard valve means which emits a known throughflow quantity into said chamber and a further valve means being tested for discharging the throughflow quantity from said chamber to be measured thereby, said measuring chamber being associated with a pressure differential sensor having a movable wall one side of which is in communication with said chamber and the other side of which is exposed to a controlled pressure, said pressure differential sensor being provided with a signal transmitter responsive to movement of the movable wall for controlling the flow through the measuring chamber by adjusting one of said valve means, means for indicating the adjustment of said valve means, further characterized by said pressure differential sensor including a cylinder having a wall and further provided with a piston means associated with a piston rod, said piston rod having one free end thereof arranged to cooperate with said signal transmitter and said piston means further including confronting sealing means having an extent which cooperates with said cylinder wall to form an annular seal therebetween.
Claim 3
Dependent Claim
26 words
Pressure differential indicating apparatus as defined by claim 1, in which said confronting sealing means comprise mirror image foil-like sealing lip portions extending toward one another.
Claim 4
Dependent Claim
23 words
Pressure differential indicating apparatus as defined by claim 2, in which said sealing lip portions are preferably between 0.05 to 0.2 millimeter thick.
Claim 5
Dependent Claim
31 words
Pressure differential indicating apparatus as defined by claim 2, in which said sealing lip portions include a skirt area inclined at an extremely acute angle (α) relative to said cylinder wall.
Claim 6
Dependent Claim
26 words
Pressure differential indicating apparatus as defined by claim 1, in which said confronting sealing means straddle a disk-like element and are retained thereagainst by flange means.
Claim 7
Dependent Claim
16 words
Pressure differential indicating apparatus as defined by claim 1, in which said sealing means comprise polytetrafluoroethylene.
Claim 8
Dependent Claim
23 words
Pressure differential indicating apparatus as defined by claim 1, in which said sealing means are of the same thickness throughout their entire extent.
Claim 9
Dependent Claim
29 words
Pressure differential indicating apparatus as defined by claim 1, in which said confronting sealing means are embraced by oppositely disposed flange means that terminate adjacent to said cylinder wall.
Claim 10
Dependent Claim
33 words
Pressure differential indicating apparatus as defined by claim 1, in which said piston rod has oppositely extending portions each of which are arranged to extend through a path surrounded by plural bearing means.
Claim 11
Dependent Claim
24 words
Pressure differential indicating apparatus as defined by claim 9, in which said bearing means include axle portions that extend perpendicular to said piston rod.
Claim 12
Dependent Claim
35 words
Pressure differential indicating apparatus as defined by claim 9, in which each of said plural bearing means disposed about the opposite end portions of said piston rod are rotated 60 degrees relative to each other.
References Cited (Backward Citations)
US2934938A
Cited
US3271994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |