Woodworking – Special-work machine – Hinge-seat cutting
Reexamination Certificate
2000-04-04
2001-07-31
Bray, W. Donald (Department: 3725)
Woodworking
Special-work machine
Hinge-seat cutting
C033S197000, C030S197000, C144S075000
Reexamination Certificate
active
06267162
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention generally relates to a mortising tool that permits removal of a specific amount of material, a mortise, from an object. More specifically, this invention permits the formation of a mortise on a hinge-receiving object, such as a door.
SUMMARY OF THE INVENTION
In the field of carpentry, one task which occurs often is the installation of a hinge on a door. Often the door is made of wood and the hinge-receiving edge of the door is a smooth surface out of which a quantity of wood must be removed to provide a space, or mortise, for the placement of the door-mounted portion of the hinge, also known as a hinge plate. In a known art method of providing a mortise on an edge of a door, an outline of the mortise is inscribed, a chisel is used to cut the outline into the door, and a quantity of wood is chiseled out of the door edge within the confines of the outlined scribed area. Moreover, the depth at which the chisel penetrates the edge of the door is difficult to control. As a result, the chiseled out mortise region may have a rough edge and an uneven lower surface. In this respect, it would be desirable for an apparatus to be provided which permits a mortise region for an edge of a door to have a smooth edge and an even, lower surface. The effect of which would result in the installation of a hinge esthetically and properly installed in the mortise.
Throughout the years, a number of inventions have been developed relating to mechanical devices providing mortises on door edges, which do so in a variety of manners. However, all utilize a frame structure that guides a knife that removes a specific quantity of material from the door as it cuts.
Generally, these devices can be classified as those that are secured to the door or to the doorjamb by clamping to the door or doorjamb (see U.S. Pat. Nos. 4,235,268 or 5,511,312), and those that are first secured to the door or to the door jamb by driving a set of knives into the door (see U.S. Pat. Nos. 2,794,461 or 3,850,211). These knives cut the outline of a mortise for a hinge plate, but the knives do not remove material from the door as they cut.
Several different methods disclose a frame for guiding a knife that removes material from a door permitting flush mounting of a hinge plate in a door or doorjamb. In a first method, the frame provides a groove to guide the knife, and also provides threaded engagement with the knife to drive the knife into the door (see U.S. Pat. Nos. 2,794,461 or 5,511,312). In a second method, the frame provides a groove to guide the knife, and also provides guide pins (see U.S. Pat. No. 3,850,211). The guide pins are struck by a hammer or other blunt instrument to drive the knife into the door. In a third method, the frame provides a groove to guide the knife, and also provides a rack and pinion arrangement to drive the knife into the door (see U.S. Pat. No. 2,794,460). In another apparatus, a knife is hingedly connected to the frame, and is pivoted into the door to form a mortise (see U.S. Pat. No. 1,754,925).
All the known mechanical devices disclosed in the prior art that form a mortise to receive a door hinge plate have one thing in common in addition to their intended function; they have moving parts, i.e., blades, with respect to their frames. These complicated devices present an opportunity for lost or damaged parts. It would be desirable to have a manually operated device of rugged, unitary and uncomplicated construction.
Furthermore, it is recognized that electrically-powered devices, such as routers and fixtures utilizing routers exist to produce mortises in doors or door jambs. However, these devices are bulky, expensive, complicated, and require electrical power. It would be desirable to have a small, inexpensive mechanical device that is easy to use, requiring only a blunt instrument, such as a hammer, to form a mortise.
Accordingly, among the several objects, features and advantages of the invention may be noted the provision of a mortising tool comprising a mortise forming member having an upper surface, a lower surface, a leading end and a rearward striking end;
cutting device connected to said lower surface of said mortise forming member and directed toward said leading end of said mortise forming member;
whereby a mortise for receiving a hinge is formed by removing a specific quantity of material from a hinge receiving object such as a door or door frame.
Other objects and features will be apparent or are pointed out in more particular detail hereinbelow.
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Bray W. Donald
Greensfelder Hemker & Gale, P.C.
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