Patent Grant
6842986
The present invention relates to the field of cutting tools, and, more particularly, to the field of cutting tools having curved blades, and associated methods.
Cutting tools come in various shapes and sizes, and are used for different purposes. Some different types of cutting tools include knives, swords, and bayonets, for example. Accordingly, cutting tools may include blades that have different shapes and sizes.
U.S. Pat. No. 2,048,322 to Cathey, for example, discloses a paring knife having an elongate handle, and an elongate blade connected to the elongate handle. The elongate blade extends outwardly from the handle in an initial downward curve, followed by an upward curve, and ending in a downswept, tapered tip. In other words, the blade is substantially U-shaped. The blade also includes a sharpened lower edge. The shape and configuration of the blade may, however, limit the use of the knife.
U.S. Design Pat. No. 363,109 to Hall discloses a knife having a curved handle, and an elongate blade connected to the curved handle. The elongate blade includes hook-shaped portions along the upper and lower edges adjacent the handle, and upper and lower sharpened edges opposite the handle and, ends in an upswept, tapered tip. The lower hook portions of the blade may interfere with uses of the sharpened lower edge for cutting or slicing applications, for example.
U.S. Pat. No. 5,095,623 to Williams discloses a firefighting tool including an elongate handle, and an elongate blade connected to the elongate handle. The elongate blade includes a substantially linear proximal portion extending longitudinally outwardly from an end of the handle, a substantially linear medial portion extending outwardly along an angle from an end of the proximal portion, and a substantially linear distal portion extending outwardly along an angle from an end of the medial portion. The blade also includes a sharpened upper edge. A lower edge of the proximal portion of the blade is sharpened, and the lower edge of the medial and distal portions are saw-shaped. This blade may be disadvantageous because the saw-shaped portions of the blade may interfere with use of the sharpened lower edge.
In view of the foregoing background, it is therefore an object of the present invention to provide a more versatile cutting tool.
This, and other objects, features, and advantages of the present invention are provided by a cutting tool that may comprise an elongate handle to be grasped by a user, and an elongate blade connected to the elongate handle. The elongate blade may comprise a downwardly sloping proximal portion extending outwardly from an end of the handle, and a linear distal portion extending substantially parallel to and downwardly offset from an axis defined by the elongate handle and ending in a tapered tip.
The downwardly sloping proximal portion may have a sharpened lower edge and the linear offset distal portion may have a sharpened lower edge. The linear offset distal portion may also have a sharpened upper edge. The sharpened upper and lower edges advantageously allow the cutting tool to be used for many different applications. The tapered tip of the linear offset distal portion may curve upwardly to define an upswept tip at an angle of about 5 to 15 degrees.
The downwardly sloping distal portion may break downwardly at an angle of about 30 to 50 degrees from the axis of the handle and may have a substantially uniform predetermined width. The linear offset distal portion may also have the predetermined width upstream of the tapered tip.
The cutting tool may also comprise a guard connected between the handle and the blade. The guard may comprise a thumb guard portion extending upwardly and a finger guard portion extending downwardly. The guard advantageously provides a buffer between the users hand and the elongate blade. The downwardly sloping proximal portion and the linear offset distal portion may have about equal lengths. In some embodiments, the blade may have a length of less than about twelve inches so that the cutting tool is a knife. In other embodiments, the blade may have a length of greater than about twelve inches so that the cutting tool is a sword.
A method aspect of the present invention is for making the cutting tool. The method may comprise connecting an elongate blade, as described above, to an elongate handle to be grasped by a user.
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout, and prime notation is used to indicate similar elements in alternate embodiments.
Referring initially to
The downwardly sloping proximal portion 42 illustratively has a sharpened lower edge 50, and the curved distal portion 44 illustratively has a sharpened upper edge 52 and a sharpened lower edge 54. The sharpened lower edges 50, 54 of the downwardly sloping proximal portion 42 and the linear offset distal portion 44 are advantageous when using the cutting tool 20 for chopping, or slicing, for example, or other common uses as will be understood by those skilled in the art. The sharpened upper edge 52 of the linear offset distal portion 44 is also advantageous when using the cutting tool 20 for slicing in an upward direction, for example, or other common uses of as will also be understood by those skilled in the art.
The downwardly sloping proximal portion 42 of the elongate blade 40 illustratively has a uniform width, illustrated in
The downwardly sloping proximal portion 42 of the elongate blade 40 has a length L1, and the linear offset distal portion 44 of the blade has a length L2. The length L1 of the downwardly sloping proximal portion 42 and the predetermined length L2 of the linear offset distal portion 44 are illustratively about equal. For example, the length L1 may be about 3 inches and the length L2 may be about 4 inches, although other dimensions are also contemplated by the present invention. In some embodiments, an overall length of the elongate blade 40 may be less than about 12 inches so that the cutting tool 20 is a knife. In other embodiments, the overall length of the elongate blade 40 may be greater than about 12 inches so that the cutting tool 20 is a sword.
The cutting tool 20 also illustratively comprises a guard 60 connected between the elongate handle 30 and the elongate blade 40. The guard 60 illustratively comprises a thumb guard portion 62 extending upwardly, and a finger guard portion 64 extending downwardly. More specifically, the thumb guard portion 62 is curved and extends upwardly and outwardly over an upper edge of the downwardly sloping proximal portion 42 of the blade 40. The finger guard portion 64 is also curved and extends downwardly and outwardly over the sharpened lower edge 54 of the downwardly sloping proximal portion 42 of the blade 40. The guard 60 advantageously provides a buffer between the users hand and the elongate blade 40 to protect the hand of the user from contact with the blade.
The elongate handle 30 illustratively includes a butt end 32 opposite the guard 60. The butt end 32 may be curved downwardly to facilitate gripping by the user. The butt end 32 may be weighted to balance the cutting tool 20. For example, the weighted butt end 32 may have a weight substantially similar to the weight of the blade 40 so that the cutting tool 20 is balanced when grasped in the hand of a user. The elongate handle 30 may further include a non-slip grip surface. The non-slip grip surface may be provided by a dimpled rubber coating, for example, or another similar material as will be understood by those skilled in the art.
The downwardly sloping proximal portion 42 of the blade 40 illustratively breaks downwardly at an angle α from the axis 48 of the elongate handle 30. More particularly, the angle α may be between about 30 and 50 degrees from the axis 48 of the elongate handle 30. The downward angle α of the proximal portion 42, along with the sharpened lower edge 54, is advantageous when using the cutting tool 20 to cut or slice, for example, in a downward direction.
The tapered tip 46 of the linear offset distal portion 44 of the blade 40 illustratively curves upwardly to define an upswept tip. More particularly, the upswept tip is illustratively upswept at an angle β from the linear offset distal portion 44 of the blade 40. The angle β may be about 5 to 15 degrees from an adjacent portion of the linear offset distal portion 44 of the blade 40. The upswept tip 46, along with the sharpened upper edge 52 of the linear offset distal portion 44, is advantageous when using the cutting tool 20 piercing, for example.
Turning now to
A method aspect of the present invention is for making a cutting tool 20. The method may comprise connecting an elongate blade 40, as described above, to an elongate handle 30 to be grasped by a user. The method may further comprise connecting a guard 60, as described above, between the elongate handle 30 and the elongate blade 40.
Other aspects of the cutting tool 20 are described in co-pending U.S. patent application Ser. No. 10/295,786, entitled “Cutting Tool With Curved Distal Portion And Associated Methods”, having Attorney Docket No. 113.2168, filed concurrently herewith, the entire contents of which are incorporated herein by reference. Many modifications and other embodiments of the invention will come to the mind of one skilled in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed, and that other modifications and embodiments are intended to be included within the scope of the appended claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 31534 | McKinzie | Feb 1861 | A |
| 49164 | Strachan | Aug 1865 | A |
| 116027 | Coulon | Jun 1871 | A |
| 502042 | Jenner | Jul 1893 | A |
| 912146 | Moffett | Feb 1909 | A |
| 914947 | Hammerly | Mar 1909 | A |
| 979686 | Nelson et al. | Dec 1910 | A |
| 1239065 | Wigiert | Sep 1917 | A |
| 1398850 | Franco | Nov 1921 | A |
| 1552153 | Hartbauer | Sep 1925 | A |
| 1614772 | Bambini et al. | Jan 1927 | A |
| 1645101 | Gibb et al. | Oct 1927 | A |
| 1679806 | Bockstadter | Aug 1928 | A |
| 1698111 | Clark | Jan 1929 | A |
| 2007700 | Ziminski | Jul 1935 | A |
| 2048322 | Cathey | Jul 1936 | A |
| 2279833 | Madan | Apr 1942 | A |
| 2429405 | Dringman | Oct 1947 | A |
| 2635337 | Mercy | Apr 1953 | A |
| 2651839 | Folland | Sep 1953 | A |
| 2695450 | Platts | Nov 1954 | A |
| 2906021 | Cromoga | Sep 1959 | A |
| 3108375 | Papp | Oct 1963 | A |
| 3605268 | Cassell, Sr. | Sep 1971 | A |
| 3824688 | Goffe | Jul 1974 | A |
| 3918158 | Debski | Nov 1975 | A |
| 4442570 | Lynn | Apr 1984 | A |
| 4593466 | O'Brien | Jun 1986 | A |
| 4821356 | Finn | Apr 1989 | A |
| 4890390 | Begon | Jan 1990 | A |
| 4970786 | Harper | Nov 1990 | A |
| 5095623 | Williams | Mar 1992 | A |
| D363109 | Hall | Oct 1995 | S |
| D366515 | Thompson | Jan 1996 | S |
| 5490332 | Levin | Feb 1996 | A |
| 5528834 | Seber et al. | Jun 1996 | A |
| D371592 | Hall et al. | Jul 1996 | S |
| 5581892 | Dean | Dec 1996 | A |
| 5581895 | Jeffcoat | Dec 1996 | A |
| D390304 | Thompson | Feb 1998 | S |
| D397016 | Pohl | Aug 1998 | S |
| D422669 | Elishewitz | Apr 2000 | S |
| 6052908 | Harman | Apr 2000 | A |
| D425389 | Elishewitz | May 2000 | S |
| D441827 | Frank | May 2001 | S |
| 6308355 | McMillan et al. | Oct 2001 | B1 |
| D451571 | Barker, II | Dec 2001 | S |
| D452546 | Barker, II | Dec 2001 | S |
| 6401341 | Hernandez | Jun 2002 | B1 |
| 6450871 | Morrison, Jr. et al. | Sep 2002 | B1 |
| 6460255 | Dassaud | Oct 2002 | B1 |
| 20030208910 | Dudley et al. | Nov 2003 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20040093741 A1 | May 2004 | US |
