US2623288A - Equipped portable drawing board - Google Patents

Description

1952 K. B. GUSTAFSSON 2,623,288

EQUIPPED PORTABLE DRAWING BOARD Filed June 16, 1948 2 SHEETSSHEET 1 nsfl INVENTOR m4, 235,; Mm; L,

9 1952 K. B. GUSTAFSSON 2,623,288

EQUIPPED PORTABLE DRAWING BOARD Filed June 16, 1948 2 SHEETS-SHEET 2 INVENTOR Patented Dec. 30, 1952 UNITED STATES PATENT OFFICE Application June 16, 1948, Serial No. 33,416 In Sweden August 4, 1947 2 Claims.

This invention relates to an equipped portable drawing board and more particularly to a portable drawing board having a movable ruling device attached thereto in a manner to permit the use of one single rule for drawing lines in any desired and determinable direction over said board.

It is previously known by the U. S. Patent No. 684,836 to Rich to provide a drawing board wherein a single detachable rule may be used in such a way by being alternatively detached from one straight guiding rail and attached to another guiding rail running perpendicularly to said first-mentioned rail. However, the use of such a detachable rule involves certain drawbacks in that the rule may be easily lost and the repeated detachment and attachment of the rule from and to the respective rails is time wasting and inconvenient.

My invention may be considered an improvement of said known drawing outfit and the main object of my invention is to provide an equipped drawing board, wherein said drawbacks are eliminated and wherein a single rule is attached to slide with reliable guidance along three sides of the drawing board without being detached from its guiding rail.

A further object of my invention is to provide an equipped drawing board wherein the rule by being attached to a swingable frame may be capable to lie substantially flat on the drawing surface or paper in any relative position independent of the number and thickness of the papers attached to the board so that the drawing outfit may be used with known types of drawing paper blocks having perforations to be immediately fixed in a predetermined position on the drawing surface by means of pins.

A suitable embodiment of the invention is illustrated in the accompanying drawing in which:

Fig. 1 is a plan view,

Fig. 2 is a section on line II--II, Fig. 1, and

Figs. 3 and 4 are details on a larger scale.

In the drawing, 1 denotes a plate or the like on which can be placed a block of suitable kind. This block is retained on the plate I by means of pins 3 projecting from the plate and traversing holes in the block. The pins 3 are spaced on the plate I in such a manner that they fit in holes made in the block by an ordinary punching apparatus. The reference numeral 4 denotes a U-shaped frame on which is displaceably mounted a runner 5 to which a rule 6 is swingably connected. By means of hingelike joints 1 the frame 4 is connected to the plate I so that the latter can be swung up and down. In the runner 5 is located a plate or wire spring 8 resting against the said frame and adapted always to hold the point of the runner directed at right angles to said frame, in any position of the runner. The swinging axis between the runner 5 and the rule 6 is denoted by 9. Due to the U-shaped construction of the frame 4 illustrated in Fig. l, the runner and the rule can thus be moved along three of the block sides and at the same time the rule can be set to any angle which can be read and predetermined.

As will be seen from Figs. 3 and 4, the runner consists of a body in which is made a throughrecess 10 for the frame 4 and the spring 8, said recess Ill having inner surfaces so spaced from each other as to permit the runner 5 to pass around the curved corners of frame 4 without binding. To the runner is fixed a pointer II by means of which the settabl angle of the rule 6 can be read on a graduation on the rule. To the rule 6 is fixed a plate 12 provided. with a number of recesses l3 into which a projection [4 on the pointer H is adapted to snap when the rule is being turned relatively to the runner 5 and the pointer ll, so that the rule can be stopped in any desired angular position relatively to the runner.

Of course, the invention is not limited to the specific embodiment shown in the drawing as the size, shape and detail arrangement may be varied.

I am aware that the different parts combined to form my equipped drawing board are known per se. Thus, a somewhat similar swingable frame is previously known e. g. in enlarging easels for photographic purposes and therefore I do not claim such parts broadly, but in a certain combination in which they provide a new and useful outfit for drawing and sketching purposes.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a portable drawing board the combination of a rigid plate, a U-shaped frame having straight shanks and curved corners, the ends of the shanks of said frame being hingedly connected to said plate thereby permitting said frame to swing between an upright position and a position parallel to said plate, a runner transversally embracing said frame and capable of sliding along all portions of said frame without removal therefrom, said runner having a recess for the passage of the frame and said recess having a straight inner surface resting directly against the outer edge of said frame and an opposed inner surface facing the inner edge of said frame, said last-mentioned inner surface being spaced from said inner edge of said frame such a distance as to permit displacement of said runner over said curved corners of said frame, a leaf spring inserted between said inner edge of said frame and said last-mentioned inner surface of said runner to keep the first mentioned inner surface thereof resting against said outer edge of said frame, and an adjustable rule attached to said runner.

2. In a portable drawing board the combination of a rigid plate, at least two projections protruding over the upper surface of said plate for receiving a block of drawing sheets having corresponding holes, a U-shaped frame having straight shanks and curved corners, theends of the shanks of which are hingedly connected to said plate at one side thereof, so that said frame may be swung up from said plate thereby leaving the space for said block free thereon, a slidable runner transversally embracing said frame and an angularly adjustable rule swingably connected to said runner, said runner having a straight inner surface resting against the outer edge of said frame and an opposed inner surface facing the inner edge of said frame, said last 4 mentioned inner surface being spaced such a distance from said inner edge of said frame as permit displacement of said runner over said curved corners of said frame, a leaf spring being inserted between said inner edge of said frame and said last mentioned inner surface of said runner to keep the first mentioned inner surface thereof resting against said outer edge of said frame.

KLAS BoRJE GUSTAFSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 530,806 Tilton Dec. 11, 1894 634,836 Rich Oct. 10, 1899 818,051 Ross Apr. 17, 1906 829,137 Brauchli Aug. 21, 1906 1,294,768 Carlson Feb 18, 1919 1,376,098 Jones Apr. 26, 1921 1,720,690 Preble Apr. 23, 1928 1,752,910 Kent Apr. 1, 1930 2,116,430 Gordon Dec. 14, 1934 2,077,677 Dawson Apr. 20, 1937 2,084,432 Clear June 22, 1937 2,238,106 Fleischer Apr. 15, 1941

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