Dual trowel blade assembly

Details Dual trowel blade assembly Dual trowel blade assembly

1999-12-28

2001-07-24

Will, Thomas B. (Department: 3673)

Road structure, process, or apparatus

Apparatus

Tool rotating in horizontal plane

C404S114000, C404S120000, C451S350000

Reexamination Certificate

active

06264397

ABSTRACT:

This invention pertains to rotary power driven surfacing implements, and more particularly to a trowel blade assembly for use with such implements.
For illustrative purposes the present invention is shown as embodied in a concrete trowelling machine or trowel for operating on the surface of concrete floor installations and the like, such as described in U.S. Pat. Nos. 2,594,331, 2,662,454 and 2,689,507.
BACKGROUND OF THE INVENTION
Although dual trowel blade assemblies, comprising a finish blade attached to a trowel blade, have been disclosed before, as in the aforenoted '507 patent, they do not provide the ultimate in achievable efficiency. Essentially, they fail to recognize that not only must the trowel blade accomplish its assigned task by trowelling on a concrete surface, i.e., by assuming variable tilt angles with respect to such surface, but cooperatively therewith, the attached finish blade should be continuously in contact with the working surface regardless of the tilt angle.
Therefore, a primary object of the present invention is to so arrange the integration of the two types of blades having different characteristics in an assembly such that both tasks noted above can be accomplished, whereby the concrete surface will be constantly smoothed at the same time that it is being worked on by the trowel blade.
An ancillary object is to achieve in a cost-effective and efficient manner the attachment of both types of blades to the trowelling machine, with appropriate positioning of the leading edge of the finish blade relative to the trowel blade to accomplish the stated purposes.
SUMMARY OF THE INVENTION
The above and other objects are fulfilled by the present invention of a dual trowel blade assembly for use with a rotary surfacing machine, the assembly comprising a relatively thick, inflexible trowel blade and a relatively thin, flexible finish blade, wherein the latter is secured in overlapping relationship with respect to the former. When in operation on a substantially horizontal working surface, the finish blade is continuously in contact with the working surface regardless of the variable degrees of tilting of the trowel blade with respect to the working surface as a consequence of oscillating the dual blade assembly about the horizontal.
The above and other objects of the invention are realized by the features of construction hereinafter described in a preferred embodiment as illustrated in the accompanying drawings.


REFERENCES:
patent: 2594331 (1952-04-01), McCrey
patent: 2605683 (1952-08-01), Boulton
patent: 2662454 (1953-12-01), Whiteman
patent: 2667824 (1954-02-01), McCrey
patent: 2689507 (1954-12-01), McCreary
patent: 3375766 (1968-04-01), Zochil
patent: 5759590 (1998-06-01), Cacossa
patent: 6058922 (2000-05-01), Sexton

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