AU592479B2

AU592479B2 - Adjustable set-square

Info

Publication number: AU592479B2
Application number: AU80568/87A
Authority: AU
Inventors: Reginald Cecil Robinson
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-10-27
Filing date: 1987-10-27
Publication date: 1990-01-11
Anticipated expiration: 2007-10-27
Also published as: AU8056887A

Description

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l COMMONWEA OF AUSTR A 2 4 7 PATENTS ACT, 1952 COMPLETE SPECIFICATION FOR OFFICE USE Short Title: Inc. C1.

Application Number: Lodged:

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4 0 .e *a 0 00 Ao A 00 *r 0 I I It( 0: Complete Specification Lodged Accepted: Lapsed: Published: Priority: Related Art: TO ,E COMPLETED BY APPLICANT Name of Applicant: Reginald Cecil Robinson Address of Applicant: 21 Merriman Street, KYLE BAY, N.S.W. 2221 Actual Inventor: As above Address for Service: ANDERSON-TAYLOR ASSOCIATES, Registered Patent and Trade Mark Attorneys of Carina Road Oyster Bay N.S.W. 2225 Complete Specification for the invention entitled: ADJUSTABLE SET-SQUARE The following statement is a full description of'this invention including the best method of performing it known to me:i-l ili-l- _L.lil f 'A 4 40 4* 4 0 0 44 40*54 0044 This invention relates to hand tools or instruments and more particularly discloses an improved set-square.

Existing set-squares for scribing or testing angles in carpentry or metal working etc. are of a rigid nonadjustable construction. As a result their utility is normally limited to either a right angle or the other preset complementary angles.

It is therefore an object of this invention to ameliorate the aforementioned disadvantage and accordingly an adjustable set-square is disclosed which comprises a ight-angle triangular blade with a calibrated scale along the hypotenuse and at least one of the acute angles thereof truncated, a rib having a longitudinal slot extending part way along its length from one end and being pivotably attached at said end to the right angle vertice of the blade in a manner whereby said blade is slidable wholly within the slot and the rib is movable either along said scale or completely clear of said blade by passing the other closed end of the rib over said truncated corner and said closed end also being configured to complete the profile of said truncated corner when the rib is aligned with an adjacent edge of the blade.

A preferred embodiment of this invention will now be described with reference to the attached drawings in which: Figures 1 and 2 show side and perspective views of a adjustable set-square with the shoulder mamber at the degree position, Figures 3 and 4 show side and perspective views of the setsquare with the shoulder member at an intermediate angle of 65 degrees.

*4 1 t t I r .2 hne device basically comprises a triangular blade 1 which in this case includes a right angle 2 and two complementary -2a- L 450 angles 3 and 4. It is to be understood however that the invention is not limited in this respect and other angles could be substituted for those illustrated. A rib 5 is pivotably attached to the triangle at the right angle vertice S'by a bolt and thumb nut.6. This member has a central slot 7 through which side 8 of the triangle may slide to allow the rib to align with any selected position from 00 to 900 along an angular scale 9 intermediate the ends of the hypotenuse 10 as shown in figures 3 and 4. The thumb nut can then be tightened ft to lock the rib in the desired position. For rigidity this t slot 6 terminates short of the free outer end of the rib I r i t c and one corner 11 of the triangle is therefore truncated to enable the side 8 to clear this end as the adjustment is made. Preferably however the end face 12 of the rib is sloped to complete the profile of the triangle when it is \aligned parallel with the side 8 at the 900 mark.

In use the device provides substantial advantages over existing tools such as the conventional set-square. By aligning and locking the rib 5 at a selected angle and then 4t t *t placing the shoulder 12A up against a reference edge on a work piece such angle can be quickly and precisely scribed across the surface of the piece using the straight edge 13. Conversely existing angles on a work piece can be tested by placing the shoulder against the reference edge and then rotating the blade 1 until the straight edge 13 aligns with the face or mark to be measured.

Although not shown in the drawings it is preferred that the -3opposite side of the hypotenuse 10 also be marked so as to provide the complementary angle of that shown on scale 9 to form a 1800 or straight joint between two mating faces.

Because of the speed and accuracy provided by this tool it is envisaged that it would be particularly useful in applications such as the assembly and fitting of gutters on buildings where a wide range of angled joints have to be accurately cut for downpipes and eaves.

7 It will thus be appreciated that this invention at least t t ;r rr r I ct i in r.ne rorm or tne emooaiment aescrioea provides a novel and unique tool for carpentry, metalwork or the like.

Clearly however the particular example disclosed is only the currently preferred form of this invention and a wide variety of modifications may be made which would be apparent to a man skilled in the art. For example the shape and configuration of the rib as well as the magnitude of the angles in the triangle may all be varied according to application or design preference. Also while the device in it's current form is preferably constructed of metal other materials such as plastics or even wood may also be used within the scope of this invention.

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Claims

1. An adjustable set-square comprising a right-angled triangular blade with a calibrated scale along the hypotenuse and at least one of the acute angles thereof truncated, a rib having a longitudinal slot extending part way along its length from one end and being pivotably attached at said one end to the right angle vertice of the blade in a manner whereby said blade is slidable wholly within said slot and the rib is movable either I, along said scale or completely clear of said blade by t passing the other closed end of the rib over said *truncated corner and said closed end also being configured to complete the profile of said truncated corner when the rib is aligned with an adjacent edge of the blade.

2. The adjustable set-square as claimed in claim 1 wherein the rib is pivotably attached to the blade by means of a bolt and thumb nut which may be tightened to lock said rib at a selected orientation to the blade.

3. The adjustable set-square as claimed in claim 1 or 2 wherein it is constructed at least in part from metal.

4. The adjustable set-square as claimed in claim 1 or 2 wherein it is constructed at least in part from plastic.

The adjustable set-square as claimed in claim 1 or 2 "@yLlkerein it is constructed at least in part from wood.

6. An adjustable set-square substantially as described herein with reference to the attached drawings. Dated this 14th day of December, 1988 Reginald Cecil Robinson By his Patent Attorney MICHAEL ANDERSON-TAYLOR r T 6 tr r t Fr I-,i -6-