GB2241182A

GB2241182A - Drill chuck with countersinking jaws

Info

Publication number: GB2241182A
Application number: GB9001890A
Authority: GB
Inventors: Jeffrey Gordon Roe
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-26
Filing date: 1990-01-26
Publication date: 1991-08-28
Also published as: GB9001890D0

Abstract

The chuck has machined on the outer faces of the jaws countersinking formations to provide countersinking in a single operation with drilling. The drilling depth is determined purely by the projection of the drill from the jaws providing easy setting. <IMAGE>

Description

- THE RO-CHUCK ("RO"tarv Depth Adjustment dnd Counter-Sink Facility chuck)@ This invention is an electric drill chuck designed to allow adjustment of the drill bit's exposure from the chuck uf zero to the maximum working length of the bit, and to provide a counter- sink facility for all bit sizes up to the maximum chuck capacity - THE RO-CHUCK - the reasons for its developlllent.

As with most practical invelt ions tile RO-CHUCK was designed to solve a persistant problem e.-sperierlced throughout the building, carpentry and metal trades.IE: The need to drill hole.# in all types of materials to a specific size and depth, it is probably the most essential procedure in all type of construction and manufacture, particularly in tie ON-SITE situation.

With the increasing use of sheet materials most constructions are made from a basic frame covered with a sheet of either wood or metal or in the kitchen or- bedroom environment, a surfaced chipboard.

The procedures for constructing the frames, whether using "SCREW-GLUE, "PLASTIC-BLOCK, "rLASTIC-DOWELS, all need specific depth holes boring and often a counter-sink hole to receive the screw-head Most constructions involving sheet materials require holes to be drilled through the sheet material and partially into the frame to allow the correct screw of the uniform size to be used and usually a counter-sink hole to accept the screw head. When drilling on site with the present tools available the depth required to drill is marked on the "bit" either with tape, wire, paint, nail varnish, washers, rubbers bands or anything that is available.All these methods fail for the same reason, invariably after only a few holes are drilled to the marker the drill bit will be allowed to drill too deeply and the surface of the material will remove the marker or disturb it so that it needs re-measuring and replacing.

When the drilling is eventually completed it is usually necessary to counter-sink for the screw head, this involves either removing the drill bit from the electric drill and replacing with a counter-sink bit or often the professional will have a hand drill with a counter-sink bit permanently fitted, he will then have to go round counter-sinking the pre-drilled holes.

Invariably the screw holes which were accidently drilled to deeply (past the marker) will require longer screws than those used, so when the standard screw will not grip, it has to be removed and a suitably longer screw found and used. Or as often happens the short screw is left in serving no useful purpose and the construction is weakened.

The Ro-Chuck solves all the problems described abuve anu reduces the operation time hay at least 50@ it canbe used with considerable effect in large arid small manufacturing processes and is invaluable for on site. construction.

In one simple operation the exact depth of hole can be set by adjusting the length of bit extending out from the counter-sink face of the Ro-Chuck (with an allowance being made for the counter-sink depth if required) and the holes can then be drilled and counter sunk to the correct depth.

There is no accidental "drilling too deep" no re-measuring and re-marking, no problems with trying to find longer screws, or removing the too short ones, no accidental drilling "through" no need for "double-work" in drilling and then counter-sinking.

The RO-CHUCK is a simple but very effective solution to a problem which exists in manufacturing but to perhaps a greater extent in the ON-SITE and DI situation.

An explanation of the drawings: Drawing 1. shows a cross section of the RO-CHUCK and the primary drive of the electric drill, the sections (i.e. thickness) of the material used is increased from that which is usually used, to accommodate the BIT CHAMBER, which extends through the chuck the chuck shaft and the primary drive, all other dimensions of the chuck are similar to those in coon use today.

View A. shows the machining on the surface of the BIT GRIPS and the chuck face to provide the counter sink cutting facility Drawing 2. shows the same as drawing 1 but includes brief descriptions of the points raised in the text, A description of how to use the facilities of the RO-CHUCK After deciding the most suitable screw size (length and thickness) for the work in hand a bit of the correct size an type will be fitted into the RO-CHUCK, the length of the exposed part of the bit is determined by the length of the screw to be used, if the hole is to be counter-sunk the depth of counter-- sinking should be taken into consideration when determining the length of bit exposed. As the chuck is tig @@@ ii;,ii;le chuck key the specially machined inner-faces of the bit grips contact the outer surface of the bit and hold it firmly in the required position.

The correct size of hole and counter-sink can be drillod in one simple operation. If the counter-sink facility is not required the depth of hole is determined by the point at the front of the grip.

Claims

CLAIMS. The RO-CHUCK is designed to facilitate precise depth drilling using all drill bits regardless of thickness (i.e. bore' upto the maximum drill chuck capacity and at depths from zero to the maximum working length of the bit being used, such length only being determined by the depth of the hole required combined with the maximum length of the bit chamber. The RO-CHUCK facilitates precise counter-sinking for all bit thicknesses upto the capacity of the chuck. The RO-CHUCK has machined faces on the bit grips to hold any size of bit firmly, irregardless of the working length of the bit exposed. Amendments to the claims have been filed as follows CLAIMS.

1. The RO-CHUCK is a drill chuck which accomodates drill bits and allows the exposed length of the bit to be adusted from zero to the full- working length of the bit. The rotating faces of the RO-CHUCK are machined to provide a counter-sink facility.

2. The RO-CHUCK as claimed in Claim 1 wherein the bit grips are inset with material and machined to grip the bit securely at any, and all parts of its length.

3. The RO-CHUCK as claimed in Claim 1 wherein the shaft is of sufficient dimension to accomodate the drill bits full length and diameter

4. The RO-CHUCK substantially as described herein with reference to the accompanying drawings I and 2.