Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Reexamination Certificate
1999-03-23
2001-10-09
Will, Thomas B. (Department: 3673)
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
C015S093100
Reexamination Certificate
active
06299257
ABSTRACT:
BACKGROUND OF THE INVENTION
In the renovation and repair of industrial buildings, such as factories and warehouses, it is often necessary to remove existing floor coverings. These floor coverings can be of a great variety of materials, such as rugs, wood, tile, etc. which are secured to a cement floor by high strength adhesive. The removal of such floor coverings is a labor intensive and difficult task. The machines currently available take the form of hand or motor driven scrapers which push a heavy duty scraping blade over the floor to raise the floor covering.
A machine of this type which is designed specifically for tile removal is described in U.S. Pat. No. 5,641,206. The machine of the '206 patent employs an hydraulic cylinder to raise and lower the blade into engagement with the floor. The force distribution requires supplemental weights at the front and back of the machine to increase the force response of the blade and to insure proper traction on the rear wheel. Such machines do not perform efficiently, thereby requiring repetitive passes over the floor.
It is the purpose of this invention to improve the performance of a tile scrapping machine and the overall operation of such machines.
SUMMARY OF THE INVENTION
A machine is designed having a frame articulated along a pivot axis displaced a short distance forward of the wheel axis. The frame consists of a main body and a rear portion. The main body is constructed with an integral blade mounting bracket welded to its forward end. A forward support wheel is mounted for vertical movement on the main body just rearward of the blade. An hydraulic piston is operatively connected to the support wheel to retract the wheel during operation of the scrapper.
The rear frame portion is constructed with a pair of flanges having means to attach the axle for the rear wheels. The flanges extend a short distance both forward and rearward of the axis of the wheels. The main body is pivotally attached to the rear flanges by means of a horizontally extending cylindrical bar just forward of the drive wheel axis. A transverse beam connects the two flanges just behind the axis of the drive wheels. In order to adjust the angle of the blade a second hydraulic cylinder is connected to the transverse beam to exert a moment force on the rear frame portion to pivot the flanges about the wheel axis and thereby raise the rear of the main body.
The main body encloses a reservoir for hydraulic fluid which is pumped to independent drive pumps operatively connected to each wheel. In addition the same fluid is used to operate the front wheel retraction cylinder and the rear blade height adjustment cylinder. A drive pressure is obtained from main drive pumps which may be operated either by a piston engine powered by propane or an electrical motor each being mounted on the main body.
REFERENCES:
patent: 2468336 (1949-04-01), Lewis
patent: 2906514 (1959-09-01), Becker
patent: 4365843 (1982-12-01), Grasse
patent: 4504093 (1985-03-01), Grasse
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: 5641206 (1997-06-01), Craft
patent: 5772284 (1998-06-01), Lindsey et al.
patent: 5830313 (1998-11-01), Smith
Kreck John
Perman & Green LLP
Will Thomas B.
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