Cutlery – Cutting tools – Saw
Reexamination Certificate
1998-08-14
2001-07-10
Rada, Rinaldi I. (Department: 3724)
Cutlery
Cutting tools
Saw
C030S507000
Reexamination Certificate
active
06256891
ABSTRACT:
TECHNOLOGY FIELD
This invention relates to hand held tools, and more particularly to a light duty electric reciprocating handsaw.
BACKGROUND OF THE INVENTION
Conventional electrically powered hand tools are very convenient for performing small tasks. Larger tasks usually require floor size models of bandsaws and other particular configurations for cutting metal, PVC, wood, and/or any other material. Generally, however, the larger tools tend to have a smaller sized counterpart for use around the house, or in off-site applications for commercial operations. In response to this, the inventors have searched for a hand held version of a cut-off tool, but do not know of any intermediately sized type tool between a portable bandsaw and a hand operated hacksaw.
Conventional tools which have been used to a certain degree of success include a “Sawz-All”, or the like. However, due to the fact that the blade of the “Sawz-All” extends outside of the tool itself, without any protection on the other end for a two-handed operation, it is an extremely dangerous tool. Its intended use was for breaking through drywall and other wall materials, although people have been using this tool as a cut-off tool. There is a great need for a small, cut-off tool that has a handle on opposite sides of the blade for safe handling. In other words, there is a need for a smaller, electrically operated portable cut-off tool or hacksaw, without utilizing a very dangerous configuration, especially one that is not likely to hurt the operator if they are inexperienced or not a strong man.
Small cutting operations around the house, such as pipe, moldings, or even a 2×4 stud really only require a small cutoff tool. To date, there does not appear to be a tool that will effectively meet those needs. U.S. Pat. No. 2,206,614 discloses a power hacksaw, although it is inconvenient to use because the weight of the saw is unevenly distributed. U.S. Pat. No. 2,721,586 discloses a power operated reciprocating blade handsaw, which again has the problem of uneven weight distribution, making the tool unwieldy to use. More recently, U.S. Pat. Nos. 5,561,909 and 5,442,857 have issued disclosing a portable powered hacksaw and a battery powered saw, respectively, again with the same weight distribution problem.
Therefore, it would be an advantage to provide a light duty electric reciprocating handsaw for achieving the above objectives.
SUMMARY OF THE INVENTION
In order to accomplish the desired attributes as described, our invention discloses a light duty electric reciprocating handsaw that includes a properly weight-balanced unit with a sufficiently large throat above the reciprocating saw blade to accommodate common household needs, such as a 2×4 stud, painting molding, or pipe common in households and commercial enterprises. Other electric hacksaws in the prior art have improperly balanced the weight distribution such that it would render operations difficult.
Our light duty electric reciprocating handsaw includes a body assembly, or housing, having a throat therein with a reciprocating saw blade attached between the two distal ends of the throat. A motor means is mounted within the body assembly in a position such that the weight is properly balanced. The motor means has a reciprocating output which is connected to the saw blade. The throat of the body assembly is generally defined by an upside-down U-shaped configuration for receiving a workpiece therein after cutting with the saw blade. The balance of the weight is generally located over the saw blade, with the remainder of the weight being distributed generally evenly throughout the rest of the handsaw. With this weight distribution, the operator of the saw will experience an aid in cutting the workpiece through the force of gravity. A downwardly extending skag rests up against the workpiece to secure the blade against the workpiece, so that a more accurate cut can be made in a safe manner.
The reciprocating handsaw may be either electrically powered with a cord or it may be battery powered, utilizing the very popular battery packs which are either rechargeable and interchangeable, or replaceable.
Further disclosed is a holder for the reciprocating handsaw and the workpiece. In order to give the operator a free hand to hold a workpiece, this aspect of the invention can increase the number of cuts made, increase the safety factor, and markedly increase the accuracy of the cuts. The handsaw holder includes a base such as a baseplate, a clamp, a magnetic means, or any other suitable means for holding the reciprocating saw onto a tabletop, or any other desired surface. The holder is pivotally and slidably attachable to the base such that the downwardly extending skag can contact and secure the blade against various sizes and shapes of workpieces. A workpiece support trough is included for holding the workpiece in place while the reciprocating handsaw is slid down and/or over the workpiece to effect the cut. The trough may have an interior surface treatment such as knurling or gridding to help prevent rolling of the workpiece. Tie downs may also be included to hold the workpiece within the workpiece trough.
A reciprocating motor means is also disclosed which includes a grooved rotating cylindrical body having a helical path for the groove. The helical path is a single turn helix rotatable against a stationary rotating bar to give horizontal movement to a groove guide which is affixed through mesne devices to the proximal end of the reciprocating saw blade.
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Van Camp James L.
Van Camp John W.
Cargill Lynn E.
Hall Melissa L.
Rada Rinaldi I.
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