GB2276585A

GB2276585A - Portable mortising tool

Info

Publication number: GB2276585A
Application number: GB9306351A
Authority: GB
Inventors: Andrew Paul-Kirri
Original assignee: PAUL KIRRI ANDREW
Current assignee: PAUL KIRRI ANDREW
Priority date: 1993-02-25
Filing date: 1993-03-26
Publication date: 1994-10-05
Also published as: GB9303765D0; GB9306351D0

Abstract

A portable mortising tool on which various cutting bits can be used, comprises: a) means for attaching the tool to the workpiece; b) means for attaching cutting bits and positioning them over the workpiece; c) means for guiding the cutting tool into the workpiece and d) means for plunging the cutting tool into the workpiece. <IMAGE>

Description

PORTABLE MORTISING TOOL This invention relates to a portable mortising tool.

There exists various specialised motorised mortise tools that enable mortising of materials to be carried out. These tools are in the form of a frame housing a motorised assembly that has provided a means for transferring power (drive belt, direct drive etc) to a rotating shaft onto which can be connected various mortise cutting attachments. They are normally in the form of a workbench top unit or mounted on a pillar stand. The rotating mortise cutting attachment is offered to the work piece by direct or lever assisted pressure from the user.

The specialised motorised mortise tool is however bulky expensive and for most applications cannot be used with work insitu.

When hand tools are used accurate mortise holes can normally only be cut by skilled craftsman. Use of hand tools is time consuming and invariably leads to an inconsistent quality of work.

The body or housing can accommodate the mechanism and can be of any shape.

According to the present invention there is provided a portable mortising tool comprising: a means for offering up to and/or securing invention to work piece; a means for attaching and securing various cutting tools; a means of positioning the cutting bit over the work piece; a means of attaching or housing a drive; a means of plunging the cutting tool into the work piece.

Several embodiments of the invention will now be illustrated by means of drawings in which: Figure 1 shows in perspective the portable mortising tool without cutting tool or drive connected; Figure 2 illustrates a source of drive (eg a power drill) and cutting tool (eg hollow square mortise chisel) connected to the mortising tool; Figure 3 shows as an example two alternate means of providing extra force to the cutting bit by means of levers; Figure 4 shows as an example in detail how at least two alternate means of connection cutting bits (eg router bit and hollow square mortise chisel) to the tool; Figure 4A shows as an example of extending the depth of cut.An extension shaft is illustrated as an example connected to a cutting bit; Figure 5 shows a front section of an example of the tool; Figure 6 shows a plan view of Figure 5; Figure 7 shows Figure 6 simplified; Figure 8 shows a side section of an example of the tool; Figure 9 shows an example of the tool positioned on a flat work piece.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings.

Referring to Figure 1 the tool comprises a means of temporarily or permanently attaching a drive unit to 1 (eg a portable power drill collar clamp) or as illustrated 13A shows as an example a router fixed onto 9. There exists two Frames (2 and 3) that are kept square and parallel by means of at least one guide an example being four rods as shown in the drawing. Frame 3 can be viewed as static in the sense that it is in contact with the work piece and Frame 2 moves in parallel and square to Frame 3. An adjustable stop can also provide for controllable depth cut. An example of securing tool to work piece is provided in the example as clamps 7. Drills, router bits, mortising chisel etc can be attached to the tool by means of the central attachment part 8 (part 8 can be an attachment to or form part of Frame 9).Frames 8 and 9 slide up and down Frame 2 by means of at least one guide as an example shown a cut grove (11). As an example of a means of locking Frame 9 onto Frame 2 is provided by a suitable locking mechanism 10.

Figure 2 shows a portable power drill clamped by 1. A hollow square mortise chisel is fitted onto 8 and connected to the drive. The tool is clamped to the work piece "A" by means of clamps 7. The operation of the tool is as follows: (a) the tool is located over the required position of cut and clamped to the work piece using 7; (b) the drive is engaged and power is transferred from drive to cutter; (c) pressure is applied to at least one of the components making up the moving assembly, in doing so the cutting bit is plunged into the work piece (d) when the required depth of cut is attained pressure to the moving assembly is released; (e) the sliding assembly comprising the drive mechanism - Frame 9 and 8 is moved up or down into the next cutting position or alternatively it can be arranged that it can move up or down with the cutter whilst in motion;; (f) above steps c to e are repeated until the required cut is achieved.

A further embodiment of the invention will now be described by way of example with reference to Figure 3.

Levers can be applied at various positions on the tool to provide extra pressure to the cutting bit and ease manual effort.

Two alternate means of providing more pressure to the cutting bit are shown. Example 1 shows a lever action applied to one of the guide rods. Example 2 shows an alternative method of applying leverage to at least one guide rod. Levers can be applied to any part of this tool to achieve a reduction of manual effort and increase cutting pressure.

A further embodiment of the invention will now be described by way of example with reference to Figure 9.

Figure 9 shows the invention adapted for use on a flat surface.

There is provided in the invention Frame 3 that is adapted for use on a flat surface. It can be seen that an example of Frame 3 could easily be adapted from Frame 3 in Figure 1 by reversing the Frame so that the now redundant clamps 7 are not in contact with the work piece.

An arrangement of clamps can secure the invention to the work piece. An example of clamping is illustrated in Figure 9. The tool can also be firmly attached to the work piece by any other suitable means (eg screws, bolts etc).

Figure 10 shows side section.

Figures 10, 11 and 12 shows an example of a means of providing extra force to the cutting bit by means of levers.

Figure 10 shows Part B which if desired can be put on Section 3.

Figure 10 also shows Part A which can be adjusted to suit Part B as on Section 3.

Figure 11 shows front section of levers and lower part section.

Figures 10, 11 and 12 shows that Section C can be a cross section rectangular bar or a round bar or rod to give better leverage.

Figure 12 shows component as a means of example that which can slide on the rods and rest against Section 3. This is an alternative means of accomplishing the desired effects.

Claims

1. A portable mortising tool comprising a body in the form of at least one frame with the following; a means of offering up to and/or securing invention to workpiece; a means of attaching and securing various cutting tools, or, a means of attaching and securing at least one device onto which the various cutting tools can be attached to; a means of positioning the cutting tool over the workpiece; a means of guiding the cutting tool into the workpiece; a means of attaching or housing a drive; a means of plunging the cutting tool onto the workpiece.

2. A portable mortising tool as claimed in Claim 1 wherein at least one means of providing additional force to the cutting tool (eg,lever) is provided.

3. A portable mortising tool as claimed in any preceding claim wherein the cutting tool can be repositioned over the workpiece without repositioning the body.

4. A portable mortising tool as claimed in any preceding claim wherein the body is secured to the workpiece using for example clamp like devices.

5. A portable mortising tool as claimed in any preceding claim wherein a suitable means of setting required depth of cut is provided.

6. A portable mortising tool as claimed in any preceding claim wherein a means of attaching an external drive (eg, power drill) is provided.

7. A portable mortising tool as claimed in any preceding claim wherein the invention has provided its own drive.

8. A portable mortising tool substantiaily as described herein with reference to Figures 1-12 of the accompanying drawing.