Stone working – Sawing – Rotary
Reexamination Certificate
1999-01-08
2001-08-14
Eley, Timothy V. (Department: 3723)
Stone working
Sawing
Rotary
C125S035000, C125S038000
Reexamination Certificate
active
06273081
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a portable masonry saw for cutting ceramic tile, brick and paver blocks. More specifically, the present invention relates to a gasoline powered masonry saw removably mounted on a low profile hand cart in order to facilitate easy transport of the saw to and from the work site as well as during the work in progress.
Heretofore, masonry saws with gasoline power have been heavy, bulky and difficult to transport. In order to be moved to and from the work site, or during the work task being performed, required the operator to stand, lift, and carry the saw or place the saw on some type of separate hand truck assembly. This was particularly inconvenient when moving the saw during the performance of the work task, such as when cutting and assembling a plurality of pavers to form a driveway or the like.
State of the art gasoline powered masonry saws are also prone to vibrations which are detrimental to achieving a clean cut of the masonry, since the supporting surface is rigid and hard.
In addition, dust removal systems for state of the art masonry saws have been less than adequate in terms of design, compactness and portability.
Accordingly, a need in the art exists for a portable masonry saw overcoming the above deficiencies of state of the art saws.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide a small, portable gasoline masonry saw which may disassemble into two pieces for easy transport, and is mountable to a low profile cart for transport to and from a work area.
It is another object of the present invention to provide a portable gasoline powered masonry saw which is movable by an operator from a kneeling position so the operator can mark, cut and install materials such as pavers without getting up and down as the work progresses.
It is a further object of the present invention to provide a gasoline or electric powered masonry saw with improved vibration damping support structure.
It is yet another object of the present invention to provide a gasoline or electric powered masonry saw with a limited number of moving parts to avoid alignment problems of the respective components.
It is still a further object of the present invention to provide a gasoline or electric powered masonry saw which is safe, stable and untippable even when cutting unusually heavy work pieces.
It is still a further object of the present invention to provide a gasoline powered masonry saw with an improved dust removal system which is compact, lightweight and highly efficient.
The objects of the present invention are fulfilled by providing a portable masonry saw apparatus comprising:
an upper frame assembly;
a lower frame assembly secured to the upper frame assembly;
an engine mounting deck secured to the upper frame assembly;
an engine for driving a cutting blade of the saw; secured to the mounting deck;
support means on the bottom of the lower frame assembly for securely supporting the apparatus on the floor of a work area in a stationary position during a cutting operation of the saw;
wheel means secured to the bottom of the lower frame assembly for transporting the apparatus, said wheel means being disposed in a raised position above the floor when the support means engages the floor, and engaging the floor when the support means is moved out of engagement with the floor; and
the combined vertical height of the upper and lower frame assemblies being such that an operator may readily operate the saw to cut masonry materials and transport the saw on the wheel means from a kneeling position.
In a preferred embodiment the support means and wheel means are part of a separate portable hand cart assembly which is easily attachable to the frame assemblies of the saw.
The masonry saw apparatus includes vibration damping material disposed between the engine deck and the upper frame assembly; as well as vibration damping material between the bottom of the hand cart and the floor.
The portable masonry saw includes a frame assembly; a mounting deck; and an arbor for the cutting blade disposed in relatively fixed position. The only major moving part is a cutting tray for supporting the material to be cut. The cutting tray is supported for relative movement with respect to the arbor and the cutting blade longitudinally of a cutting direction.
In a preferred embodiment, a dust removal assembly is provided which includes conduit means extending along the cutting path having a longitudinal slot through a top wall thereof for receiving dust from cutting of the work piece; and suction means connected to the conduit means for drawing the dust through the conduit to a dust collection device. The slot in the top of the conduit means communicates with an aligned slot in the cutting tray for supporting the work piece so that dust resulting from a cut is drawn through the respective slots into the conduit and into the dust collection device.
In another embodiment, the dust collection device comprises a dust pan with an upwardly facing concavity which may be connected to a source of water to fill the concavity with water and absorb any dust created in this fashion.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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Gorgol Paul
Harding William R
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