Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 6748836 | Dual sharpener apparatus for maintaining the sharpness of the cutting edge on blades used to cut sheet-type work materials A sheet material cutting apparatus includes a cutting head and a knife frame rotatably coupled to the cutting head. A blade defining a cutting edge is coupled for reciprocation to the knife frame, as is a primary sharpener for sharpening substantially the entire cut... | 06/15/2004 |
| 6360639 | Reciprocating knife sheet material cutting apparatus with knife sharpener A reciprocating knife cutter for performing a cutting operation on sheet material is provided wherein the knife is not limited to reciprocation along a vertical axis. The cutter includes a guide which engages the knife, whereby the knife and guide are con... | 03/26/2002 |
| 6251003 | Hand-held sharpening device A hand-held sharpening device for sharpening a blade including an elongated sharpening polygon having a plurality of substantially planar sharpening surfaces for receiving the edge of a blade, opposite ends on the elongated sharpening polygon, a plastic c... | 06/26/2001 |
| 6161453 | Saw chain sharpener for a chain saw A saw chain sharpener for a chain saw and a chain saw having a sharpener in which the bottom surfaces of the cutting teeth of a conventional bottom sharpened saw chain are conveniently sharpened automatically by running the chain under power through the s... | 12/19/2000 |
| 6059645 | Hand-held sharpening device A hand-held sharpening device for sharpening a blade including an elongated sharpening polygon having a plurality of substantially planar sharpening surfaces for receiving the edge of a blade, opposite ends on the elongated sharpening polygon, a plastic c... | 05/09/2000 |
| 5924914 | Rotary cutter head knife jointer A rotary cutter head knife jointer is disclosed, in which a rigid base is adapted for mounting in a fixed position adjacent a rotary cutter head. The jointer includes a first carriage and a first guide that mounts the first carriage to the rigid base for ... | 07/20/1999 |
| 5797788 | Grinding a mounted card clothing A card clothing is mounted on a support and rotatable therewith about an axis. A grinding apparatus for the card clothing has an abrasive grinding element, a base juxtaposed with the card clothing, and an elastic biasing element for pressing the grinding ... | 08/25/1998 |
| 5591072 | Sharpening device for food slicer The invention is a sharpener for a knife of a food slicer. The sharpener includes a base assembly and a sharpener assembly. The base assembly includes a lever mounted thereto on a pivot; the lever carrying a cam member which extends therefrom. The sharpen... | 01/07/1997 |
| 5044238 | Cutting and punching apparatus for sheet material A cutting and punching apparatus for sheet material, designed to be movably mounted on an automatic cutting machine, having a cutting tool and a punching tool, wherein said apparatus comprises means for vibrating said cutting tool, means for vertically di... | 09/03/1991 |
| 4663891 | Method of machining a workpiece with an edge-type rotary cutting tool The method of machining a workpiece with an edge-type rotary cutting tool resides in the following: the process of workpiece machining is carried out concurrently with the process of resharpening the rotary cutting tool. The resharpening of the rotary cut... | 05/12/1987 |
| 4603513 | Motor driven feed sharpener A motor driven feed sharpener for raising and lowering a sharpening stone on a feed chopper. When the sharpening stone is lowered a cover plate opens and the sharpening stone engages the top of rotating feed chopping knives and sharpens the feed chopping ... | 08/05/1986 |
| 4581856 | Apparatus for high tooth equalization of cutters Methods and apparatus for equalizing the effective radii of multiple cutting elements on a power-driven spindle of a machine tool. A fixture carrying an abrasive stone is placed upon a pre-existing workpiece supporting or guiding surface in the machine to... | 04/15/1986 |
| 4512114 | Method for high tooth equalization of cutters Methods and apparatus for equalizing the effective radii of multiple cutting elements on a power-driven spindle of a machine tool. A fixture carrying an abrasive stone is placed upon a pre-existing workpiece supporting or guiding surface in the machine to... | 04/23/1985 |
| 4509316 | Lawn mower sharpener An improved rotary, power lawn mower sharpener is disclosed which includes a base member having a lever pivotally mounted thereon for horizontal motion and having a handle for actuating the lever. The sharpener further includes a wedge having a horizontal... | 04/09/1985 |
| 4285169 | Method of using vacuum lifted blade sharpener for rotary mowers Method and apparatus are disclosed for sharpening the blade of a rotary mower. Sharpening is accomplished by utilizing the upward vacuuming action created by the rotation of the blade. At present blades having downwardly turned cutting edges and upwardly ... | 08/25/1981 |
| 4246729 | Sharpener for self-sharpening feed chopping knives An improved sharpener for self-sharpening feed chopping knives used in cutting crops, forage, ensilage and the like. The sharpener may be lowered on top of the chopping knives so that the knives are continuously sharpened during the cutting operation. The... | 01/27/1981 |
| 4189875 | Harvester cutterhead knife sharpening device A forage harvester includes a rotary cylinder-type cutterhead mounted in a housing and having a plurality of knives with cutting edges that generate a cylinder as the cutterhead rotates. A sharpening mechanism for the knives includes a pair of closed hous... | 02/26/1980 |
| 4127980 | Crossflow mower with automatic brake/sharpener A mower of the cross-flow blower type has clutch means for engaging the motor with the rotor and disengaging the motor therefrom. One wall section of the blower conduit has an abrasive panel facing the rotor and is mounted for movement between a moving po... | 12/05/1978 |
| 4047455 | Method and apparatus for sharpening end of filament in vegetation filament-trimmer An abrasive or other filament-working member is mounted at the sweep circle of a vegetation trimmer filament for progressively sharpening the end of the filament and removing excess filament during operation of the vegetation filament-trimmer; the filamen... | 09/13/1977 |
| 4031670 | Adjustable sharpener for self-sharpening feed chopping knives An improved adjustable sharpener for self-sharpening feed chopping knives. The sharpener provides a stone housing having a sharpening stone mounted therein for the sharpening of the edges of the knives mounted on a rotating cutter head. The stone is manua... | 06/28/1977 |
