WO1989009119A1

WO1989009119A1 - Scribing and pantographic guide

Info

Publication number: WO1989009119A1
Application number: PCT/GB1989/000291
Authority: WO
Inventors: Patrick John Mcgrath
Original assignee: Patrick John Mcgrath
Priority date: 1988-03-21
Filing date: 1989-03-20
Publication date: 1989-10-05

Abstract

A guide for marking a scribing line for scribing-in, that is, preparatory to cutting a board or other material to make it fit the exgigencies of a wall or walls or other surfaces, as in carpentry and other crafts. Also a guide for pantographically, or faithfully copying the contours of a protrusion or cavity onto another surface, as in carpentry and other trades and crafts.

Description

SCRIBING AND PANTOGRAPHIC GUIDE

This invention relates to a measuring, marking and copying instrument which can be used conveniently in woodworking and other trades and crafts.

In woodworking, and in other crafts, when a piece of material, say a hoard, does not fit neatly against a walls or walls, or any other surface or surfaces, but shows unwanted gaps for any reason, the edge of the board has to be put against the wall or walls, or other surface or surfaces and a line drawn (7) on the board parallel to, (that is to say, following the contours of,) the surface of the wall or walls or other surfaces. This is known as scribing or scribing-in. After cutting along this (scribed) line, the board or other material will be enabled to fit and follow the contours or exigencies of the wall or walls or other surface or surfaces.

In the same way, when a piece of material, say a board, is required to fit and follow the contours of a protrusion or cavity, it is necessary to copy these contours or details from the protrusion or cavity onto the board or other surface pantographically. After cutting along the line thus produced, the board will be enabled to fit and follow the contours or details of the protrusion or cavity. Thus, this invention can be used to cope with:

1) The problem of uneven walls, ceilings, floors and most other surface irregularities and exigencies.

2) Other problems where, for any reason, a board or other material has to be reconciled with an angle or angles of a wall or walls or other surface or surfaces.

3} Boat-building, where boards have to be fitted against curved sides.

4} Enabling a board or other material to fit over protrusions or cavities.

Normally, when a carpenter, for instance, scribes the edge of a board against a wall to get it to fit properly, he does this with a block of wood that he might have to whittle down to the required size to give him the spacing or distance required; or he may use a pencil compas or calipers, or, in the case of some highly skilled or experienced craftsmen, sometimes use, literally, rule-of-thumb, a rare skill if it is to be accurate.

Likewise, when a carpenter, for instance, fits the edge of a board against a protrusion, feature or cavity, he usually does this with the use of a profile guage which produces a contour of the protrusion or cavity. Another method is to make , by trial and error , a template or cut-out , often with cardboard.

With this invention, to use it as a scribing guide, a marker is inserted and tightened, and the shuttle is loosened and slid along to give the required spacing or distance from the wall or other surface (5) being measured, and tightened. The shuttle has a flat end which guides the invention at right angles to the surface in question (ie. the surface that is being measured by the invention.)

The invention is then slid along the surface of the board or material that is to be marked while pushing the flat shuttle- end against the wall or other surface (5) . With the marking- head slightly protruding at the bottom of the invention, a pencil line will appear. This is called a scribing line.

Likewise, to use the invention as a pantographic guide, the shuttle is loosened, turned around and the probe end presented to the protrusion or cavity that is to be measured. In order to guide the invention at right angles to the protrusion or cavity being measured, a clip-on wing (or orientation member) is slipped over the probe-end of the shuttle which will help to keep the invention on a constant parallel plane by showing up any deviation from the true line that should be followed.

The invention is slid along the board or material that is to be marked while pushing the probe end of the shuttle against the protrusion or cavity. Keeping the angle of the invention constant to the protrusion or cavity with the guidance of the slip-on wing, and with the marking-head slightly protruding at the bottom of the invention, a pantographic line, copying the moulding or protrusion, will appear.

According to the present invention there is provided: A channel-shaped housing to which is attached a loose shuttle with two right-angled ends which slide in the channel, one end having a continuance which forms a probe; a thumb-screw to stop or hold the shuttle in any desired position in the channel, a marking implement-holder with a nut to tighten the pencil, a clip-on wing which clips onto the probe end of the shuttle and which acts as a guide, and a clip-on probe extention which clips onto the probe.

The essential features of this invention are the arrangements of the foregoing, which go to make:

1) The function of scribing or scribing-in convenient and easy for the user.

2} The function of pantographically copying mouldings or protrusions onto flat surfaces conveniently and easily.

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

1) A top perspective of the assembly of the invention, with a pencil in the operating position for using as a scribing guide,

2) A top perspective of the assembly of the invention, including the clip-on wing and clip-on probe extention with a pencil in the operating position for using as a pantographic guide.

The drawings show a channel (1) known as the housing to which is attached: a) A multi-angled bar (2) known as the shuttle. The right- angled end (12) is there in order to enable the guide to be guided, as it moves along against a wall or other surfaces, at right angles to that surface which is being measured or guaged; the probe end (10) is there in order to follow more intricately the contours of a protrusion (11) or cavity, fa) A thumb screw (3) to stop or hold the shuttle at any desired position. c) A pencil-holder with a nut to tighten the pencil (4) . d) A wing (8) which clips onto the probe end of the shuttle, enabling the pencil to be guided at a constant angle to the object being measured. e) A probe extention (9) which enables the probe to negotiate deeper protrusions.

What scribing is

In carpentry, for example, (but also in other trades and crafts) particularly with built-in or fitted furniture, fitted kitchens, cupboards, wardrobes, work surfaces, fitted shelves, pipe boxing and covering, floorings, skirtings, baseboards, architraves, cornices, dados and the like, and boat-building, when the edge of a piece of material, usually a board, does not fit neatly against a wall or any other surface but shows unwanted gaps for any reason, the board has to be put (offered) against the wall or other surface and a line drawn on the board or other surface parallel to the surface (and contours of) the wall or other surface. This is known as scribing. After cutting along this scribed line, the board will fit the wall or other surface.

How pantography is understood in the context of this invention.

Instead of a framework which will allow all sides of a drawing on one surface to be copied onto another part of that surface, (as with the classic pantograph,) in the case of this invention, the use of the probe, set directly ahead of the pencil, will allow the face of a protrusion or depression, with any contours on it, to be copied from the protrusion onto a surface (of a board or other material.)

Claims

ClaimsWhat I claim is:

1. A scribing an pantographic guide comprising:

1) A housing (1) to which is releasably attached

2) A shuttle (2) which slides in the channel.

3) A means of imobilising the shuttle (3) .

4) A marking-impliraent holder (4) with a means of securing the marking irapliment, whereby, with the shuttle stopped in the desired position on the housing, the guide can be slid along, with one end or the other of the shuttle moving along the contours or exigencies of a surface, withe the shuttle generally at right angles thereto, so as to be able to reproduce those contours or exigencies on a workpiece by the marking implement.

2. A guide as claimed in Claim 1 with one end of the shuttle (2) flat in order to enable the guide to held and guided generally at right angles to the surface being measured or guaged. The other end with a projection or probe (10) which is there in order to enable the guide to follow the contours of a protrusion or depression and copy pantographically those contours, that is, directly in line with the marking implement.

3. A guide as claimed in Claims 1 or 2 , which, when operated, can be made to mark a line onto a surface in parallel with another surface to which the guide is applied.

4. A guide as claimed in Claims 1 or 2, which, when operated, can be made to mark or copy the contour of a protrusion or depression onto a surface to which the guide is applied.

5. A guide as claimed in Claim 1 or 2 in which each right- angled end has extended upper and lower edges whereby the guide can stand on those edges and the guide thus be supported.

6. A guide as claimed in Claim 1 capable of disguarding the shuttle (2) and using any extention piece that will fit into its housing, should the shuttle not be long enough for a particular job.

7. A guide as claimed in any one preceding claim in which the imobilising means is a thumbscrew passing through the housing wall to bear upon the shuttle.

8. A guide as claimed in any of Claims 2 to 7 in further combination with a detachable orientation member (8) attached to the probe end to extend generally parallel to the surface being followed.

9. A guide as claimed in any of Claims 2 to 8 in further combination with a probe extention (9) which, when clipped onto the probe, enables the probe to negotiate deeper protrusions or depressions.