Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Reexamination Certificate
1999-07-12
2001-07-24
Bagnell, David (Department: 3673)
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
C015S236010
Reexamination Certificate
active
06264282
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a blade holder for a floor stripping machine and a floor stripping machine having such a blade holder.
BACKGROUND OF THE INVENTION
Floor stripping machines (such as described in U.S. Pat. Nos. 4,504,093; 5,002,629; 5,037,160; 5,082,330; 5,197,784; 5,772,284) are used to strip carpet, tile and other floor coverings from floors. They generally use a scraping blade with a maximum length of 27 inches, so that the blade can pass through a standard doorway (28 inches). Sufficient pressure per square inch must be exerted upon the scraping blade in order to remove the floor covering. The pressure requirements vary with the type of floor covering and its mode of attachment. For example, with ceramic tile that is attached to a floor with adhesive, it is often necessary to go to a small blade in order to achieve sufficient pressure per square inch upon the scraping blade.
When the floor stripping machines are in operation, the scraping blades must frequently be replaced due to wear. In addition, when smaller blades are being used to increase the blade pressure per square inch, the positioning of the scraping blade must be adjusted between a central position and an offset position in which the scraping blade is offset to the left or right. The central position is used in open areas. The offset position is used near walls or obstructions.
The scraping blades are generally secured by bolts to a blade mounting assembly on the floor stripping machines. U.S. Pat. No. 4,365,843, filed by Grasse, illustrates and describes such a blade holder. The blade mounting assembly of the Grasse reference has a blade mounting head with outwardly projecting flanges. The scraping blade is clamped by fasteners between a blade holder plate and the flanges. While the blade mounting assembly of Grasse holds the scraping blade securely it is time consuming to replace or change the position of the scraping blade.
SUMMARY OF THE INVENTION
What is required is a blade holder for a floor stripping machine that enables rapid replacement or positional adjustment of the scraping blade.
According to a first aspect of the present invention there is provided a blade holder for a floor stripping machine includes a first member and a second member. The first member has a blade positioning seat. The second member is movable toward the blade positioning seat to a blade clamping position and away from the blade positioning seat to a blade release position, thereby permitting insertion or removal of a scraping blade. Means is provided for urging the second member into the blade clamping position.
With the blade holder, as described above, the scraping blade is rapidly changed by moving the second member away from the blade positioning seat of the first member. This must be a controlled movement. Beneficial results have been obtained when the second member is pivotally mounted to the first member and the movement is a pivotal movement.
There are various means by which the second member may be moved relative to the first member. Beneficial results have been obtained through the use of telescopic actuators that operate on fluid pressure.
According to another aspect of the present invention, there is provided a floor stripping machine which includes a body having a first end and a second end, and ground engaging wheels supporting the body at the first end. A blade holder, as described above is positioned at the second end of the body.
Although beneficial results may be obtained through the use of a blade holder that has a fixed position, it is preferred that the blade holder be movable between a travel position and an operative position. Even more beneficial results may, therefore, be obtained when the first member is mounted by a pivotal mounting bracket to the second end of the body. This enables the first member to be pivotally moved between a raised travel position and a lowered operative position. It is preferred that the first member is moved between the travel position and the operative position by means of a second actuator that telescopically expands and contracts in response to fluid pressure.
REFERENCES:
patent: 1293751 (1919-02-01), Garrison
patent: 2715770 (1955-08-01), Meyer
patent: 4053958 (1977-10-01), Taylor
patent: 4365843 (1982-12-01), Grasse
patent: 4504093 (1985-03-01), Grasse
patent: 4575936 (1986-03-01), Gringer
patent: 5002629 (1991-03-01), Nakamura
patent: 5037160 (1991-08-01), Ukai
patent: 5082330 (1992-01-01), Holder
patent: 5197784 (1993-03-01), Holder
patent: 5409299 (1995-04-01), Holder
patent: 5641206 (1997-06-01), Craft
patent: 5772284 (1998-06-01), Lindsey et al.
Crain Cutter Co., Inc. 1998 Catalog, 40 pages.
Bagnell David
Christensen O'Connor Johnson & Kindness PLLC
Kreck John
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