IL29901A - Drafting aids - Google Patents

Description

This invention relates to drafting and more to templates containing apertures of geometric configurations used by draftsmen as guides to facilitate ing standard shapes to Conventional stamped templates are available in many tions and Their availability and use greatly facilitates the application of standard repetitive patterns to the exact size required by the draftsman is not able to him in the template at hand with the result that the configuration required must be drawn by hand often resulting in loss of time and a reduction in drawing It is an object of the present invention to provide a and improved drafting aid of the type described which is adjustable to provide for changing the size of the configuration of the According to the present there is provided a ing aid a main frame having ruling edges defining one or more template apertures of a predetermined geometric configuration and maximum an auxiliary frame having one or more ruling edges congruent with at least a portion of the contour of a template aperture in the main and adjustable means interconnecting the frames for positioning the ruling edges of the frames relative to each other so that such ruling edges cooperative ly define the predetermined geometrical configuration whose size can be changed by moving one frame relative to the other without changing the By reason the adjustable means between the the size of the configuration of the template aperture can be altered by the user without changing the configuration the size of the configuration is infinitely adjustable up to the maximu An embodiment of the invention illustrated by way example in the accompanying 1 a perspective view of the preferred embodiment of drafting 2 is a top plan view of the drafting aid show in and is a section taken along the line of Referring now to the drafting aid is to com a main frame an auxiliary frame adjustable means 15 and interconnecting the Either or both of the frames may be fabricated of or translucent material such as plastic or or even material such as wood opaque Frame 1 has or more template apertures 12 of a prer determined geometric configuration and In the which is illustrative of only two of many possible frame has internal ruling edges that define square 11 and angle and establish the maximum size of these Auxiliary frame is provided with a square or rectangular open whose internal ruling edges are congruent with at a tion of the contour of a template aperture in the main In other one ruling edge defining the opening in frame 2 is associated with the of frame 1 establishing the base triangle while a perpendicular edge in frame 2 is associated with the ruling edge of frame 1 establishing one side of square Configurations and orientations other than those shown in the drawings may require ruling edges on frame 2 of a different thus changing the shape of the opening The adjustable means by which the frames are interconnected clude a pair of slots 13 and 14 in frame 1 arranged at a nut may be knurled as shown in or may be of some For the nut may be of the insufficientOCRQuality

Claims (6)

1, A drafting aid comprising a main frame having ruling edges defining one or more template apertures of a predetermined geometric configuration and maximum size; an auxiliary frame having one or mor ruling edges congruent with at least a portion of the contour of a template aperture in the main frame; and adjustable means inter- connecting the frames for positioning the ruling edges of the frames relative to each other so that such ruling edges cooperatively defin the predetermined geometrical configuration whose size can be change by moving one frame relative to the other without changing the configuration,,

2, . A drafting aid according to Claim 1, wherein the adjustable means comprises a headed fastener mounted in the main frame and having a body projecting through a slot in the auxiliary frame, and a nut on the body adjustable to clamp the frames together*·

3·, A drafting aid according to Claim 2 wherein the head of the fastener is slidably engaged in a T-shaped slot in the lower surface of the main frame.

4. A drafting aid according to any one of the preceding claims wherein the rulin edges of the auxiliar frame congruent with the template aperture are bevelled in a direction toward the ruling edges

5. A drafting aid according to claim 4 wherein the thickness of the main frame is from 2 to 5 mm;

6. A drafting aid substantially as described -above by way of example and with reference to the accompanying drawings.