Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Work-gripping clamp
Reexamination Certificate
1999-12-17
2001-09-04
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Work-gripping clamp
C408S11500B, C408S24100G
Reexamination Certificate
active
06283683
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for positionally accurately guiding cup drills, particularly for producing blind-end holes for cup hinges in plate-shaped structural components composed of wood or a substitute wood material.
2. Description of the Related Art
For fastening so-called cup hinges to pieces of furniture or similar objects, it is necessary to produce blind-end holes or blind-end bores in the plate-shaped structural components in the piece of furniture, for example, in a part of a closet or a door, wherein the cup components of the cup hinges are then fastened in the blind-end holes or bores. It is particularly important in this connection that the blind-end holes are located in a precisely predetermined position because deviations from the position impair the seat of the door. The door may also be a flap. Such blind-end holes are manufactured by means of so-called cup drills which are also called Forstner drills. Even if the position for a blind-end hole has been marked extremely precisely, it may happen that the cup drill runs of f center because the drill does not have a sufficient guide tip. The drill may also run off center especially when the plate-shaped component in which the blind-end hole is to be manufactured is of a relatively soft wood with different fiber structure. In addition, it must be taken into consideration that such blind-end holes are usually manufactured by a manual drilling machine in which the drill mounted in the drilling machine is never guided.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a device for positionally accurately guiding cup drills for manufacturing blind-end holes for cup hinges which not only facilitates a very precise positioning of the blind-end hole, but also prevents the blind-end hole from being manufactured off center and non-circular. In addition, the device is to be constructed in such a way that the cup drill is movable only up to a predetermined depth, so that breakthroughs in the plate-shaped components are avoided. This may especially happen if the blind-end hole to be manufactured has a depth which is very close to the thickness of the structural component.
In accordance with the present invention, the device is composed of a U-shaped base body which can be placed on the plate-shaped structural component, wherein the base body has in one leg thereof a tightening screw and in the other leg a carriage with a guide opening for the cup drill, wherein the carriage is displaceable relative to the web and can be clamped against the plate-shaped component.
This device can be aligned very precisely on the plate-shaped component in which a blind-end hole is to be manufactured. For this purpose, the device is provided with scales and/or a system of coordinates. The cup drill is guided very precisely up to the drilling location. It is no longer possible that the drill runs off center. This is a particular advantage if the blind-end holes are to be manufactured by means of an unguided manual drilling machine. Moreover, the edge rim of the drilled blind-end hole can no longer tear because the contact pressure edge of the guide opening is located directly adjacent the drilling area. In addition, the device according to the present invention makes it also possible to manufacture blind-end holes which, for example, extend into each other and/or are at least partially located outside of the plate-shaped structural component.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
REFERENCES:
patent: 569896 (1896-10-01), Cauwenberg
patent: 2308055 (1943-01-01), Cogsdill
patent: 2710549 (1955-06-01), Cogsdill
patent: 5222845 (1993-06-01), Goldstein et al.
patent: 954576 (1956-11-01), None
patent: 2137262 (1973-02-01), None
patent: 2841200 (1979-04-01), None
patent: 2023034 (1979-12-01), None
patent: 2058613 (1981-04-01), None
Howell Daniel W.
Kueffner Friedrich
LandOfFree
Hinge drilling jig does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hinge drilling jig, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hinge drilling jig will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2469718