US3580551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete and the like mixer
Assignee: Li&Co AG
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Filing: 1969-08-14
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Granted: 1971-05-25
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Expires: 1989-08-14
Abstract
Abstract A concrete or the like mixer comprises an open-topped main mixing container and a premixer disposed above the main mixing container and having a circular bottom wall rotated about a vertical axis and normally frictionally engaging the lower part of a cylindrical sidewall forming a premixing container together with said bottom wall. In order to discharge the contents of the premixer into the main mixing container, the bottom and sidewalls of the premixer are temporarily disengaged, to provide a peripheral annular discharge passage.
Inventors
- 👤 Heinz Hammann
- 👤 Werner Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:50
CPC Classifications
B; B28; B28C; B28C5/00; B28C5/08; B28C5/0875; B01; B01F; B01F35/00; B01F35/45; B01F35/453; B28C5/18; B28C5/26; B28C5/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
A concrete and the like mixer comprising in combination: 1. a main mixer including an open-topped main mixing container, and 2. a premixer disposed above said main mixer and comprised of a. a circular bottom wall supported for rotation about a vertical axis, b. a cylindrical sidewall coaxial with and peripherally supported for free rotation about said axis, c. said sidewall arranged with its lower edge normally in frictional coupling engagement with said bottom wall, to be rotated thereby and to form therewith a premixing container, and d. means to temporarily disengage said bottom and sidewalls, to provide a peripheral annular passage for the discharge of the contents of said premixing container into said main mixing container.
Claim 2
Dependent Claim
117 words
A concrete and the like mixer comprising in combination: 1. a main mixer including an open-topped main mixing container, and 2. a premixer disposed above said main mixer and comprised of a. a circular bottom wall supported for rotation about a vertical axis, b. a cylindrical sidewall coaxial with and peripherally supported for free rotation about said axis, c. said sidewall arranged with its lower edge normally in frictional coupling engagement with said bottom wall, to be rotated thereby and to form therewith a premixing container, and d. means to temporarily disengage said bottom and sidewalls, to provide a peripheral annular passage for the discharge of the contents of said premixing container into said main mixing container.
Claim 3
Dependent Claim
16 words
A mixer as claimed in claim 1, wherein said bottom wall has a flat conical shape.
Claim 4
Dependent Claim
96 words
a premixer disposed above said main mixer and comprised of a. a circular bottom wall supported for rotation about a vertical axis, b. a cylindrical sidewall coaxial with and peripherally supported for free rotation about said axis, c. said sidewall arranged with its lower edge normally in frictional coupling engagement with said bottom wall, to be rotated thereby and to form therewith a premixing container, and d. means to temporarily disengage said bottom and sidewalls, to provide a peripheral annular passage for the discharge of the contents of said premixing container into said main mixing container.
Claim 5
Dependent Claim
96 words
a premixer disposed above said main mixer and comprised of a. a circular bottom wall supported for rotation about a vertical axis, b. a cylindrical sidewall coaxial with and peripherally supported for free rotation about said axis, c. said sidewall arranged with its lower edge normally in frictional coupling engagement with said bottom wall, to be rotated thereby and to form therewith a premixing container, and d. means to temporarily disengage said bottom and sidewalls, to provide a peripheral annular passage for the discharge of the contents of said premixing container into said main mixing container.
Claim 6
Dependent Claim
44 words
A mixer as claimed in claim 1, wherein said sidewall has an inturned lower portion engaged by the edge of said bottom wall in the normal position and acting as a discharge chute for the contents of said premixer in the discharge position thereof.
Claim 7
Dependent Claim
24 words
A mixer as claimed in claim 3, wherein said last means is comprised of means to temporarily raise the bottom wall of said premixer.
Claim 8
Dependent Claim
23 words
A mixer as claimed in claim 3, wherein said last means is comprised of means to temporarily lower the sidewall of said premixer.
Claim 9
Dependent Claim
20 words
A mixer as claimed in claim 1, including means to feed the aggregates to be mixed to said premixing container.
Claim 10
Dependent Claim
37 words
A mixer as claimed in claim 1, wherein said main mixing container is of cylindrical shape concentric with said premixer and said sidewall is freely rotatively peripherally supported by the upper edge of said main mixing container.
Claim 11
Dependent Claim
43 words
A mixer as claimed in claim 1, wherein said main mixing container is of cylindrical shape concentric with said premixer and said sidewall of said premixer is freely rotatively peripherally and axially displaceably supported upon the upper edge of said main mixing container.
Claim 12
Dependent Claim
81 words
A mixer as claimed in claim 1, wherein said sidewall of said premixer has an inturned lower portion engaged by the edge of said bottom wall in the normal position and acting as a discharge chute for the contents of the premixer in the discharge position thereof, said main mixing container is of cylindrical shape concentric with said premixer and having an upper flange, and said sidewall of said premixer is freely rotatively peripherally and axially displaceably supported by said flange.
Claim 13
Dependent Claim
48 words
A mixer as claimed in claim 9, wherein the last-mentioned support comprises a plurality of compressed fluid-controlled cylinders evenly distributed over and extending from said flange, said cylinders having pistons and piston rods with tHe upper ends of said rods slidably engaging a circular guide of said sidewall.
References Cited (Backward Citations)
US1447125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |