US4900154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete mixer having means for determining the consistency of concrete mixing therein
Assignee: Individual
•
Filing: 1988-09-20
•
Granted: 1990-02-13
•
Expires: 2008-09-20
Abstract
Abstract A concrete mixer is disclosed having a mixing drum and a drag body is mounted in the drum which has a drag surface positioned to at least partially come into contact with concrete in the drum during a measuring phase in the concrete mixing operation. A hydraulic driving circuit is provided to oscillate the drag body at least during the measuring phase. A pressure sensor is connected in the hydraulic driving circuit for measuring the actual pressure value in the hydraulic driving circuit which is indicative of the flow resistance on the drag surface during the measuring phase of the mixing operation.
Inventors
- 👤 Franz Waitzinger
- 👤 Gerhard Hudelmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:48
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4231; B28C7/00; B28C7/02; B28C7/022; B28C7/024; G01N11/00; G01N11/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A concrete mixer for determining the consistency of concrete mixed therein during a measuring phase in a concrete mixing operation comprising: a mixing drum (2); a drag body (8, 9) mounted in said drum to be completely immersed in the concrete at least during the measuring phase and having a drag surface (6, 7) positioned to at least partially come into contact with concrete in said drum during said measuring phase; a hydraulic driving circuit (11-14) operatively connected to oscillate said drag body; and a pressure sensor (16, 16') connected to said hydraulic driving circuit for measuring the actual pressure value in said hydraulic driving circuit indicative of flow resistance on said drag surface during said measuring phase.
Claim 2
Dependent Claim
118 words
A concrete mixer for determining the consistency of concrete mixed therein during a measuring phase in a concrete mixing operation comprising: a mixing drum (2); a drag body (8, 9) mounted in said drum to be completely immersed in the concrete at least during the measuring phase and having a drag surface (6, 7) positioned to at least partially come into contact with concrete in said drum during said measuring phase; a hydraulic driving circuit (11-14) operatively connected to oscillate said drag body; and a pressure sensor (16, 16') connected to said hydraulic driving circuit for measuring the actual pressure value in said hydraulic driving circuit indicative of flow resistance on said drag surface during said measuring phase.
Claim 3
Dependent Claim
61 words
A concrete mixer according to claim 1 wherein said mixer includes a control unit (17, 17') having a predetermined pressure value; and means for receiving said actual pressure value, comparing said actual pressure value with said predetermined pressure value and generating a control signal in response to said actual pressure value remaining substantially constant for a predetermined time interval (B-C, D-E).
Claim 4
Dependent Claim
45 words
A concrete mixer according to claim 2 wherein said control unit (17, 17') has means for generating a switch-off signal in response to the actual pressure value measured by said pressure sensor substantially corresponding to said predetermined pressure value for a predetermined time interval (G-H).
References Cited (Backward Citations)
SU159123A1
Cited
US2409014A
Cited
US1730893A
Cited
US2089604A
Cited
US2643542A
Cited
US2630706A
Cited
DE2429858A1
Cited
US3933341A
Cited
US4356723A
Cited
US4027859A
Cited
SU903129A1
Cited
DE3026033A1
Cited
SU961983A1
Cited
US4490045A
Cited
US4436429A
Cited
US4522499A
Cited
US4704898A
Cited
US4544275A
Cited
US4585355A
Cited
US4730934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |