US2908079A

US2908079A - Anchoring device for a t-square

Info

Publication number: US2908079A
Application number: US619026A
Authority: US
Inventors: Horace M Barrett
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-10-29
Filing date: 1956-10-29
Publication date: 1959-10-13
Anticipated expiration: 1976-10-13

Description

Oct. 13, 1959 H. M. BARRETT ANCHORING DEVICE FOR A T-SQUARE Filed Oct. 29, 1956 Fl G. 3

FIG?

' INVENTOR HORACE M. BARRETT ATTORNEY '4 r l8 2 I aw a2 United States Patent 2,908,079 AN CHORING DEVICE FOR A T-SQUARE Horace M. Barrett, Oxford, Mass.

Application October 29, 1956, Serial No. 619,026 2 Claims. (CI. 33-76) This invention relates to a new and improved draftsmans instrument such as a T-square, and particularly to anchoring means for securing a relatively small instrument in desired position directly upon a sheet of drawing paper whereby the draftsman is enabled to position his T-square where desired without the necessity for using a straight edge or edge of the drawing-board, etc., and one of the principal features of the present invention resides in the provision of pressure-sensitive adhesive means for detachably and replaceably positioning the T-square where desired, so that the same may be used accurately at any place on a large sheet of drawing paper and may be repositioned on the same sheet to a different location as often as may be needed.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 is a plan view illustrating the T-square;

Figs. 2, 3, 4 and 5 are enlarged sectional views taken on the respective lines of Fig. 1;

Fig. 6 is a plan view of a part of the device showing a modification, parts being broken away; and

Fig. 7 is an enlarged section on line 7 -7 of Fig. 6.

Referring to the drawings, the reference numeral 10 indicates generally a head or square for the T-square, the head or square being provided with straight

longitudinal edges

12 and 14 adjacent-top fiat surfaces which may be divided as desired in any scales.

The square 10 is provided with a more or less centrally arranged longitudinal undercut slot 16 which extends generally the length of the device except for the end portions thereof, and terminates in a rectangular enlargement at 18 for a purpose to be described.

An elongated straight edge indicated at 20 is provided at one end as with an enlargement 22 which has a transverse downwardly extending dove-tail at 24. This dovetail is recessed from the flat bottom surface at 26 as clearly shown in Fig. 2, and by inserting the dove-tail 24 '10 to insure accurate 90 positioning of the straight edge 20 relative to the square 10.

The lower flat surface 26 is clearly co-planar with the lower flat surface of the square 10, see Fig. 2, so that surface 26 is in contact with the supporting surface for the instrument.

At each end portion of the head 10, there is provided a wedge-shaped opening passing entirely through the same, said opening preferably being tapered as shown in Figs. 4 and 5 in order to wedgingly secure therein a strip of pressure-sensitive tape 34 as by means of a wedgeshaped block or the like 36. This block may be provided with a handle 38.

In the use of the device, the square 10 is positioned where desired with reference to the portion of the drawing the draftsman may be working on, and it may be used 2,908,079 Patented Oct. 13, 1959 either in a horizontal position as shown; or in a vertical position corresponding to the position of the T-square head against the edge of the drawing-board; or the square 10 may be placed at any angle upon the drawing. In any event, the straight edge 20 is at an accurate rightangle with respect to the length of the head and may be moved therealong as described. By lightly pressing on the handle 38, the blocks 36 will press the pressuresensitive tape 34 down onto the paper upon which the draftsman is working to lightly but firmly hold the square 10 in the exact position desired.

When the draftsman wishes to re-position the device, it is merely necessary to loosen the pressure-sensitive tapes 34 and then re-position the device wherever desired, using a fresh length of pressure-sensitive tape if necessary to once more hold the T-square head as described.

In the modification shown in Figs. ,6 and 7, the head 40 is similar to that at 10, but in this case is not provided with blocks at the end portions thereof. Instead, pressuresensitive tape is provided which is adhesive on both sides thereof as represented by the reference numeral 42. In this case, the blocks 36 are not necessary but the user merely presses down upon the head 40 and the pressuresensitive tape 42 adheres both to the under side of the head 40 and to the drafting paper upon which the draftsman is working.

It is pointed out that any other adhesive means may be used in order to hold the head 10 temporarily in position where desired, but it is not possible to use suction cups or any device in which the lower edge 26 of the straight edge and also of the head is not flatly and firmly held on the drawings, i.e. the entire T-square should be flat on the paper. Otherwise the draftsman will not be able to draw accurately. The entire drawing instrument may be made of clear plastic so that it may be positioned quickly and accurately.

7 Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. A T-square comprising an elongated grooved headment fitting the undercut groove for selective adjustment of the straight edge element along the head substantially from aperture to aperture, each aperture having spaced side walls in part defining the same, a strip of pressuresensitive adhesive tape in each aperture with the tacky side down to contact said walls and a surface to which the T-square is to be secured by the tape, a separate handmanipulated element in each aperture filling the same and holding the tape to said walls and to said surface, and means on the hand-manipulated elements by which to withdraw the same from its respective aperture to provide for separating the tape from said surface and said walls.

2. The T-square of claim 1 wherein the apertures are wedge-shaped and the hand manipulated elements compn'se wedges.

References Cited in the file of this patent UNITED STATES PATENTS 826,425 Heathcote July 17, 1906 864,396 Weston Aug. 27, 1-907 1,115,333 Pease Oct. 27, 1914 1,340,623 Owens May 18, 1920 1,343,968 Hahn June 22, 1920 2,161,236 Shaw June 6, 1939 2,340,970 Lustrik Feb. 8, 1944 2,559,470 Schneider July 3, 1951