Road structure – process – or apparatus – Apparatus – With means for alternative ground support by tool or...
Reexamination Certificate
2007-04-17
2007-04-17
Addie, Raymond W (Department: 3671)
Road structure, process, or apparatus
Apparatus
With means for alternative ground support by tool or...
C404S084500, C404S084800, C404S118000
Reexamination Certificate
active
11085492
ABSTRACT:
A lightweight one man screed apparatus to automatically strike off and level uncured concrete flatwork, includes a tri-pod framework beneath which a cutting/leveling member operates. The apparatus is controlled by two grade setting devices, adjustably mounted to the screed tool, which may be adjusted relative to a laser plane generating system. Physical control of the screed member may be provided by at least one screed tool pivotal arm assembly moved for and aft by a carriage operated under the tri-pod framework within a fore and aft footprint. The screed tool is adjusted to grade by being raised or lowered by at least one linear actuators responding to an electronic controller. When moving the framework and screed assembly into freshly poured concrete, an operator is assisted by retractable wheels. The wheels are rotationally stowable or used deployed as part of the tripod/transport system facilitating mobility.
REFERENCES:
patent: 3970405 (1976-07-01), Swisher et al.
patent: 5871302 (1999-02-01), Carlson
patent: 6976805 (2005-12-01), Quenzi et al.
patent: 7121762 (2006-10-01), Quenzi et al.
patent: 2005/0163565 (2005-07-01), Quenzi et al.
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