Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Reexamination Certificate
1998-04-20
2001-09-04
Dexter, Clark F. (Department: 3724)
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
C083S698310, C083S698410
Reexamination Certificate
active
06283003
ABSTRACT:
FIELD OF INVENTION
This invention relates to a sheet cutting system and, in particular, to a knife attachment that is interchangeable with a panel saw attachment for a sheet cutting system.
BACKGROUND OF INVENTION
Systems for cutting sheet material, such as mat, sheet rock, cardboard, wood panel and the like, have been known for many years. Exemplary mat cutting systems are disclosed in U.S. Pat. Nos. 286,422; 2,835,037; 3,996,827; 3,463,041; 3,964,360; 3,967,519; 4,038,751; 4,867,023; and, 5,272,947. Exemplary large or construction sheet material (for example, 4×8 feet size) cutting systems are disclosed in U.S. Pat. Nos. 3,866,496; 4,058,150, 4,176,572; 4,802,399; and, 5,582,088.
The prior art mat cutting systems generally use a knife or blade. The cutting heads that hold these knives range from simple to complex. However, most of these heads are designed for a mat cutting operation and are not durable, easy to manufacture and easy to use in commercial graphic arts and construction type applications.
Construction type cutting systems are typified by the aforementioned U.S. Pat. No. 4,802,399 to Olson. This patent discloses an A-frame type support for holding a construction size work piece for cutting by a saw attachment on a carriage. The carriage is arranged for travel on a pair of rails and guide tubes to saw a cut through the work piece.
The inventors of the present invention are aware of a knife attachment, Utility Knife Attachment available from Saw Trax Mfg. of Acworth, Ga., for a construction type cutting system. This attachment merely uses an utility knife fastened to a sheet metal bracket. This attachment is not rigid and does not achieve the desired accuracy in use.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a durable knife attachment for commercial graphic arts and construction cutting systems.
Another object of the present invention is to provide such a knife attachment that is easy to assemble, easy to use, easy to change blades, and easy to adjust for depth penetration and for blade angle.
These and other objects of the present invention are fulfilled by a knife attachment that has a base with a top surface and a bottom surface. The bottom surface faces a work piece which is supported by a frame. The base has a hole extending between its top and bottom surfaces. An elongated blade holder extends through the hole. The blade holder has a first slot extending therethrough and along the length dimension of the blade holder. A mounting plate is adapted to be mounted to the top surface of the base. A structure, such as a screw and a post, is mounted on the mounting plate and is slidably disposed in the first slot to define a depth penetration path along the blade holder length dimension. This allows the blade holder to slide toward and away from the work piece. The screw is preferably a carriage bolt that is operable to lock the blade holder to a desired penetration depth.
In another embodiment, a second slot extends through the mounting plate. The carriage bolt is also slidably disposed in the second slot and arranged when tightened to lock the blade holder to both a desired penetration depth and to a desired angle with respect to the work piece.
In still another embodiment, a backer board has a third slot. The backer board is disposed behind the work piece with the third slot in alignment with the blade. The backer board gives continuous support to the work piece in the region of the cut and provides a path for the blade during cutting operations.
REFERENCES:
patent: 286422 (1883-10-01), Gaylord
patent: 570180 (1896-10-01), McCall
patent: 2013893 (1935-09-01), Matthews
patent: 2835037 (1958-05-01), Middents
patent: 3463041 (1969-08-01), Shapiro et al.
patent: 3527131 (1970-09-01), Ellerin
patent: 3866496 (1975-02-01), Payne et al.
patent: 3964360 (1976-06-01), Schwartz
patent: 3967519 (1976-07-01), Esterly
patent: 3996827 (1976-12-01), Logan
patent: 4038751 (1977-08-01), Albright
patent: 4058150 (1977-11-01), Pennington
patent: 4176572 (1979-12-01), Pennington
patent: 4802399 (1989-02-01), Olson
patent: 4871156 (1989-10-01), Kozyrski et al.
patent: 5309642 (1994-05-01), McGinnis
patent: 5603253 (1997-02-01), Logan
Sawtrax—Coroplast Cutting Knife Attachment—4 pps., Mar. 11, 1998.
Hanson David L.
Johnson Daniel F.
Dexter Clark F.
Ohlandt Greeley Ruggiero & Perle LLP
Safety Speed Cut Manufacturing Company, Inc.
LandOfFree
Knife attachment for a sheet cutting system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Knife attachment for a sheet cutting system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Knife attachment for a sheet cutting system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2478617