Patent Application
20150266119
The present invention relates generally to tools. More particularly, the present invention relates to reciprocating saw blades.
The reciprocating saw is a powered saw that is commonly used in construction and demolition work. The reciprocating saw is particularly useful for cutting through wood, drywall, metal pipes, and pipes. The thin elongated blade of the reciprocating saw allows the user to access and cut through materials in difficult to reach locations. Reciprocating saws, as their name suggests, utilize a reciprocating mechanism that extends the blade outward before drawing the blade inward in a push and pull motion. The cutting effectiveness of reciprocating saws may be increased through the use of an orbital action. An orbital action generates a reciprocating motion of the blade that causes the serrated edge of the saw blade to cycle in an oval pattern and come into contact with the cutting surface. The additional up and down motion complements the original push-pull motion of the saw blade in order to increase the effectiveness of the reciprocating saw. Individual models of reciprocating saws incorporate a number of unique features such as variable speed and cordless design. A wide variety of reciprocating saw blades is available with the blades generally being categorized based on the type of material that the user desires to cut. As previously discussed, reciprocating saw blades are available in variants for wood cutting, drywall cutting, metal cutting, and pipe cutting. The present invention seeks to enhance and improve upon current and conventional designs of reciprocating saw blades for further increasing the cutting effectiveness of reciprocating saws.
The present invention is a saw blade for reciprocating saws that incorporates an arrangement of teeth for increasing the cutting effectiveness of reciprocating saws. In the preferred embodiment of the present invention, the saw blade comprises an arrangement of teeth in which the teeth are positioned facing backward or forward in intervals. The orientation of the saw blade teeth reverse in intervals that correspond approximately to the length of each stroke that a reciprocating saw makes during use. In the preferred embodiment of the present invention, the arrangement of saw blade teeth is such that the rear end teeth of the saw blade are oriented backward toward the rear end of the saw blade. The teeth extend toward the front end of the saw blade in this backward orientation. The teeth then reverse direction and are oriented forward toward the front end of the saw blade approximately one length of a reciprocating saw stroke. The reversing arrangement of the saw blade teeth continues along the entirety of the length of the cutting edge of the saw blade. The saw blade features a standardized design that is common to most conventional reciprocating saw blades and may be installed and used in the same manner as conventional reciprocating saw blades. As such, the reciprocating saw blade features a thin elongated design with a mounting point that allows a user to install the saw blade into the corresponding front slot within the shoe of a reciprocating saw.
The object of the present invention is to increase the cutting effectiveness of reciprocating saws through the introduction of a unique saw blade design. Because the saw blade teeth reverse direction in intervals that correspond approximately to the length of a reciprocating saw stroke, the reciprocating saw is able to more effectively cut through various materials during use.
All illustrations of the drawings are for the purpose of describing selected versions of the present invention and are not intended to limit the scope of the present invention. The present invention is to be described in detail and is provided in a manner that establishes a thorough understanding of the present invention. There may be aspects of the present invention that may be practiced without the implementation of some features as they are described. It should be understood that some details have not been described in detail in order to not unnecessarily obscure focus of the invention.
The present invention is a saw blade designed primarily for use with a reciprocating type saw featuring alternating groups of forward and rearward facing teeth.
The teeth groupings switch direction in intervals that correspond approximately to the length of a reciprocating saw stroke. The alternating arrangement of teeth is intended to facilitate more effective cutting of material compared to typical, uniformly toothed saw blades due to variation of the type of tooth in contact with the material to be cut on the forward stroke versus the reverse stroke.
The present invention is a saw blade that features a physical design that is similar to those of conventional reciprocating saw blades and as such may be installed and utilized in a similar manner. As a result, the length, thickness, and other design aspects of the saw blade are similar to those of conventional reciprocating saw blades. The present invention is not limited with respect to the specific material of the saw blade. A material such as, but not limited to, spring steel is suitable for the saw blade of the present invention due to the material's resistance to snapping or shattering. Spring steel is also suitable for absorbing shock and as such is well-suited for use in a reciprocating saw blade. It is important to note that the material of the saw blade of the present invention may vary based on the specific cutting application that is required of the saw blade. For example, the saw blade material may vary based on the type of material that the user desires to cut.
Referring to
The at least one mounting portion 3 allows the present invention to be attached to a blade holder of a saw. In the preferred embodiment, the at least one mounting portion 3 is removably attached to a blade holder of a reciprocating saw, particularly a jigsaw. However, it is contemplated that many other types of saws may be utilized with the present invention, such as, but not limited to, a rip saw, a bow saw, a crosscut saw, a jab saw, or a hacksaw.
In the preferred embodiment of the present invention, the at least one mounting portion 3 is adjacently connected to the blunt edge 21 and the cutting edge 22 and is positioned between the blunt edge 21 and the cutting edge 22. Preferably, the at least one mounting portion 3 is a shank. The shank is a commonly known component of removable blades for reciprocating saws that allows the blade to be removably attached to the blade holder of the reciprocating saw. The shank is connected to the blade portion 2 adjacent to the rear end 221. The at least one mounting portion 3 may comprise a circular opening which is utilized to secure the present invention in place into a reciprocating saw.
In one contemplated alternative embodiment shown in
Referring to
In the preferred embodiment of the present invention, each of the plurality of forward-oriented teeth groupings 41 and each of the plurality of rearward-oriented teeth groupings 42 traverse a specified length 43 along the cutting edge 22. The specified length 43 should correspond to a stroke length of the reciprocating saw the present invention is attached to in the preferred embodiment. The advantage of the specified length 43 corresponding to the stroke length has the result that a given portion of material in contact with the present invention will benefit from the cutting force of some of the forward-oriented teeth and some of the rearward-oriented teeth, ideally a full stroke length of both, depending on the placement of the material section along the blade. Stroke length varies among various models of reciprocating saws. Some common stroke lengths that the present invention may embody, but is not limited to, include: ¾ inch, 1 inch, 26 mm, 1⅛ inches, 1¼ inches, or 1½ inches.
In alternate embodiments, it is contemplated that the forward-oriented teeth groupings 41 and the rearward-oriented teeth groupings 42 may be of different lengths, or the teeth groupings may change in length according to position along the cutting edge 22. However, it is preferred that the forward-oriented teeth groupings 41 and the rearward-oriented teeth groupings 42 are the same length.
Referring to
In order to more specifically define the forward-oriented teeth groupings 41 and the rearward-oriented teeth groupings 42, a first leading edge angle 5 is defined as a positive, clockwise angle, either acute or obtuse, from the cutting edge 22 to the leading edge 44 of the teeth from the forward-oriented teeth groupings 41. A first trailing edge angle 7 is defined as a positive, clockwise, acute angle from the cutting edge 22 to the trailing edge 45 of the teeth from the forward-oriented teeth groupings 41.
Similarly, a second leading edge angle 6 is defined as a positive, counterclockwise, acute angle from the cutting edge 22 to the leading edge 44 of the teeth from the rearward-oriented teeth groupings 42, and a second trailing edge angle 8 is defined as a counterclockwise angle, either acute or obtuse, from the cutting edge 22 to the trailing edge 45 for the teeth from the rearward-oriented teeth groupings 42.
The first leading edge angle 5 is greater than the first trailing edge angle 7. The second leading edge angle 6 is less than the second leading edge angle 6. This results in the forward orientation of the teeth from the forward-oriented teeth groupings 41 and the rearward orientation of the teeth from the rearward-oriented teeth groupings 42. Alternatively stated, a first imaginary line 9 pointing away from the cutting edge 22 and bisecting the leading edge 44 and the trailing edge 45 for the teeth from the forward-oriented teeth groupings 41 is angled toward the front end 220, and a second imaginary line 10 pointing away from the cutting edge 22 and bisecting the leading edge 44 and the trailing edge 45 for the teeth from the rearward-oriented teeth groupings 42 is angled toward the rear end 221.
Preferably, the teeth from the forward-oriented teeth groupings 41 are simply the reverse of the teeth from the rearward-oriented teeth groupings 42. Thus, the first leading edge angle 5 is equal to the second trailing edge angle 8, and the second leading edge angle 6 is equal to the first trailing edge angle 7. However, in alternate embodiments it is contemplated that the forward-oriented teeth groupings 41 and the rearward-oriented teeth groupings 42 may not be symmetrical, as desired.
Referring to
In the preferred embodiment, an arbitrary tooth 46 and an adjacent tooth 47 from the plurality of teeth 4 are positioned adjacent to each other on the cutting edge 22. The arbitrary tooth 46 is laterally skewed toward the first lateral surface 23, and the adjacent tooth 47 is laterally skewed toward the second lateral surface 24. This is a commonly known manner of constructing a saw blade known as kerf. The kerf of a saw blade refers to the lateral distance between the outermost edges of the teeth due to being laterally skewed; the kerf of a saw blade is equal to the sum of the blade width and twice the set of the blade, which describes the distance the teeth protrude laterally. Kerf is utilized in order to create a wider cut then the thickness of the blade in order to give the blade room to operate within the cut.
Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
The current application claims a priority to the U.S. Provisional Patent application Ser. No. 61/955,611 filed on Mar. 19, 2014.
| Number | Date | Country | |
|---|---|---|---|
| 61955611 | Mar 2014 | US |
