US3293758A

US3293758A - Drafting device

Info

Publication number: US3293758A
Application number: US397408A
Authority: US
Inventors: Lawrence H Chanoch
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-09-18
Filing date: 1964-09-18
Publication date: 1966-12-27
Anticipated expiration: 1983-12-27

Description

Dec.. 27, 1966 L H. cHANocH 3,293,758 l DRAFTING DEVICE v Filed Sept. L8, 1964 Z?, 107 F11-G#I 13) lU I IN VENTO/Q 3 Lawrence H. Chanoch @WMV M United States Patent Oliice 3,293,758 Patented Dec. 27, 1966 3,293,758 DRAFTING DEVICE Lawrence H. Chanoch, 7641 Klbourn Ave., Skokie, Ill. 60076 Filed Sept. 18, 1964, Ser. No. 397,408 Claims. (Cl. 33-110) This invention relates to an improved drafting device and more particularly to a device for providing 'a uniform spacing between parallel lines and the like in a drawing.

Draftsmen make a great deal of use of uniformly spaced parallel lines arranged l.at various angles, such as at angles of 30, 60, 45, 90 and the like, with the horizontal, for purposes of sectioning, lettering and the like. Conventional drafting techniques for making such lines or markings have required the use of a T -square and a scale for marking a pattern and a triangle for use with the pattern to effect the parallel lines. Uniform increments are usually laid out with a scale and then a triangle is displaced along the T-square for alignment with the points that have been laid out and the langular lines are drawn.

It will be appreciated that failure accurately to align the edges of the triangle with any of the plurality of marks or the failure uniformly to scale the increments Awill result in a lack. of uniformity in the separation between the parallel lines which may detract from the appearance of the drawing or from the accuracy of the drawing.

It is an object of this invention to provide a new and improved device for use in marking a drawing with uniformly Ispaced increments `and/or for drawing uniformly spaced parallel lines.

More particularly, it is an object of this invention to provide a new and improved drafting device whereby uniformly spaced parallel lines 0r markings may be effected without the use of a scale.

These and other objects of this invention will hereinafter appear and for purposes of illustration, but not of limitation, an embodiment of the invention is shown in the accompanying drawing in -which- FIG. 1 is a top plan view of the drafting device ernbodying the features of this invention;

FIG. 2 is a sectional View taken along the line 2 2 of FIG. 1;

FIG. 3 is a perspective view showing the drafting device of this invention employed in combination with a T-square and triangle; and

FIG. 4 is a view taken along the line 4-4 of FIG. 3.

Referring now to the drawing, the drafting device comprises an elongate strip having 'a rib 11 extending longitudinally of the strip to project upwardly from the upper surface thereof intermediate the lateral edges of the strip and preferably from about the mid-portion thereof to subdivide the strip into a stabilizing portion 12 on one side of the rib and a grooved portion 13 on the other side of the rib.

The stabilizing portion is provided with 'anti-slip means on the top surface to enable a more efficient gripping relationship to be established between the bottom side of the T-square or other drafting device and the upper surface of the strip portion adapted to underlie the T- square with the rib in abutting relationship with the straight edge of the T-square or other drafting device for proper alignment. Such gripping means may be in the form of an anti-slip coating 14 of rubberized material with -or without a grit, provided as an overall coating on the one side of the rib, or as spaced islands of antislip material, or as lined or patterned coatings on the surface of the strip.

The grooved portion 13 on the other side of the rib comprises a plurality of crosswise extending grooves impressed in the top surface of the strip. In the alternative, it may comprise a plurality of crosswise extending ribs or` uprights on the top surface of the strip. Such grooves or ribs are adapted uniformly to be spaced one from the other lengthwise of the strip to define the uniform spacing of liines intended to be drawn or markings intended to be ma e.

The grooves or ribs may be spaced one from the other by a uniform amount throughout the length of the strip or the strip may be formed with one group of grooves spaced from the other and with other groups of grooves spaced one from the other by other amounts so that the one device may be used to provide a single spaced pattern or one device may be employed more flexibly for different spaced patterns and the like.

In illustrating the uses that may be made of the device, description will hereinafter be made of its use in combination with a T-square and draftsman triangle but it will be understood that similar usa-ge may be made with a triangle or other drafting devices having a straight edge for use in alignment of the device.

In use with a T-square, the portion 12 having the Iantislip means is positioned under the edge of the T-square 15 with the rib 11 of the device aligned to abut against the edge 16 of the T-square. A triangle 17, having a detent 18 extending downwardly from its bottom side so |as to be received in fitting relationship within the grooves, is placed over the grooved portion 13 of the device. Although only one detent is required, it will be apparent that it would be. desirable to provide such a detent centrally placed along each edge of the triangle thereby greatly to facilitate its use with the device.

'Ihe edge 18 of the triangle is urged against the upright 11 of the T-square with the detent 18 fitting into v one of the crosswise grooves 13. When the triangle is displaced lengthwise relative to the T-square by one increment, the detent Will `be displaced from the first groove into the second groove which will then function as a stop to align the triangle with the corresponding spacing from the first position. If a double spacing is required, then the triangle may be displaced to pass beyond the next groove into the third groove, etc. Thus the detent coacts with the grooves to permit displacement of the triangle by uniform increments parallel to the T-square for use in scribing of uniformly spaced parallel lines along either side 21 or 20 of the triangle.

It will be appreciated that the anti-slip member in contact with the underside of the T-square prevents inadvertent displacement of the device when the triangle is shifted along the edge of the T-square from groove to groove. Stabilization of the device with respect to the T-square operates also to insure that the incremental movements of the triangle relative to the T-square will be uniform thereby to insure uniform spacing between the lines or marks that are drawn.

The device embodying the features of this invention may be formed of any suitable material that will -provide =a relatively rigid structure capable of repeated use. It may be formed of plastics, laminated paper, or of sheet metal, or combinations thereof.

The uniformly spaced grooves in the grooved portion 13 of the strip may be formed continuously in an endless strip by the use of a repeating stamping means in synchronous relation to the moving endless strip whereby the endless strip is run between the pressure portions of the stamping means to impress the desired groove pattern in the surface portions thereof.

It will be apparent from the foregoing that I have provided 4an inexpensive device which may be employed in a simple and eliicient manner with conventional draftsmans tools to provide for uniform spacing or marking in drawings and the like.

It will be understood that changes may be made in the details of construction, arrangement land operation without departing from the spirit of the invention, especially as defined in the following claims.

I claim:

1. A drafting device for uniform spacing comprising lan elongate strip having an upright rib extending lon-gitudinally substantially throughout the length of the strip intermediate the lateral edges to subdivide the strip into 'a stabilizing portion and a grooved portion, anti-slip means on the surface of the stabilizing portion and crosswise extending grooves in the grooved portion with the grooves having a predetermined spaced relationship therebetween and a member having at least two straight edges with one of the straight edges adapted to be positioned on the grooved portion of the stri-p in abutting relationship with the rib, and ia rib adjacent the straight edge of the member in position to cooperate with the grooves of the strip.

2. A drafting device as claimed in claim 1 in which the rib extends upwardly from the surface of the strip substantially midway between the lateral edges.

3. A drafting device as claimed in claim 1 in which the grooves are uniformly spaced one from the other substantially throughout the length of the strip.

4. A drafting device as claimed in claim 1 in which the strip is subdivided longitudinally into sections with the grooves in one section uniformly spaced one from the other and with grooves in the various sections being spaced one from the other by an amount differing from the grooves -in others of the sections.

5. In a drafting device for use in combination with a member having at least two straight edges arranged in angular relation one with the other and with a proje-ction adjacent each straight edge, an elongate strip having an upright rib extending longitudinally substantially throughout the length of the strip intermediate the lateral edges to subdivide the strip into a stabilized portion and a grooved portion and adapted to receive a straight edge of the member in abutting relationship therewith to align the member with the strip land positioned to receive the projection adjacent the straight edge for releasably positioning the member in the desired space along the strip.

References Cited by the Examiner UNITED STATES PATENTS 470,754 3/1892 Hartig 33-107 888,070 5/1908 Dissell 33-103 FOREIGN PATENTS 442,973 7/ 1912 France.

826,444 1/ 1938 France.

OTHER REFERENCES Publication: Popular Science, February 1956, page 236, Adhesive Skidproofs Template.

LEONARD FORMAN, Primary Examiner.

HARRY N. HAROIAN, Examiner.

Claims

1. A DRAFTING DEVICE FOR UNIFORM SPACING COMPRISING AN ELONGATE STRIP HAVING AN UPRIGHT RIB EXTENDING LONGITUDINALLY SUBSTANTIALLY THROUGHOUT THE LENGTH OF THE STRIP INTERMEDIATE THE LATERAL EDGES TO SUBDIVIDE THE STRIP INTO A STABILIZING PORTION AND A GROOVED PORTION, ANTI-SLIP MEANS ON THE SURFACE OF THE STABILIZING PORTION AND CROSSWISE EXTENDING GROOVES IN THE GROOVED PORTION WITH THE GROOVES HAVING A PREDETERMINED SPACED RELATIONSHIP THEREBETWEEN AND A MEMBER HAVING AT LEAST TWO STRAIGHT EDGES WITH ONE OF THE STRAIGHT EDGES ADAPTED TO BE POSITIONED ON THE GROOVED PORTION OF THE STRIP IN ABUTTING RELATIONSHIP WITH THE RIB, AND A RIB ADJACENT THE STRAIGHT EDGE OF THE MEMBER IN POSITION TO COOPERATE WITH THE GROOVES OF THE STRIP.