US1918216A - Drafting apparatus - Google Patents

Description

July 11, 1933. R SACHTLEBER 1,918,216

DRAFTING APPARATUS Oiiginal Filed July 14, 1930 3 now/Mot Tuaoz P// h. 500/4 TL EB ER Patented July 11, 1933 UNITED STATES PATENT DRAFTING APPARATUS Application filed July 14, 1930, Serial No. 467,912. Renewed December 10, 1932.

This invention relates to drafting apparatuses and more particularly to a device by means of which a perspective view may be plotted'after a side elevation and plan view of an object has been drawn.

One object of the invention is to provide a device of this character so constructed that after a side elevation and a plan view of an object have been drawn upon separate sheets of paper, a perspective view of the object may be very easily plotted by dots placed upon a third sheet of paper at points ascertained through the use of the device and the dots then oined by lines, thereby completing the perspective.

Another object of the invention is to so form the device that through its use a perspective may be very easily drawn and so proportioned that it has correct vanishing lines without it being necessary to establish vanishing points and lines before drawing the figure.

Another object of the invention is to provide a device of this character which is simvice in use.

Fig. 2 is a section taken along the line 22 of Fig. 1.

Fig. '3 is a fragmentary view upon an enlarged scale of a portion of the device.

Fig. 4 is a View illustrating a paper holder forming part of the device.

This improved drafting apparatus, which may be referred to as a perspectograph, is to be used in connection with a drawing board or table 1 of a conventional form which may be of any size desired. The strip 2 which may be formed of metal, wood, or any other material extends across the rear edge of the board and strips 3 of angle metal rest upon blocks or strips 4 extending longitudinally of the board in spaced relation to each other.

Pulleys 5 and 6 are disposed near the ends of the strips 3 and the pulleys 5 are rotatably mounted by a rod or shaft 7 while pulleys 6 are rotatably mounted by pins 8. Belts 9 are trained about the pulleys with their sleeves 11' and a pointer 12, the finger 13 of which extends towards the back of the board. The bar may carry a clip 14 by means of which a sheet of paper is to be connected with the bar. An arm 15 projects from each sleeve 11 and is formed with an opening through which extends a bolt 16,'and this bolt is formed with a shoulder 17 near its head 18 and carries a nut 19.

Rulers 20 fit about the bolts between the arms 15 and shoulders of the nuts 16'and other rulers 21 fit about the shoulders of the bolts. By this arrangement the bolts may be tightened and secure the rulers 20 in set-positions, but allow the rulers 21 to turn about the shoulders. The rulers 21 extend from the bar 10 in an opposite direction to the rulers 20 and are slidably engaged through sleeves 22 having stems 23 pivotally engaged through bearings 24 at the free ends of the brackets 25. These brackets are formed of sheet metal and at their rear ends are formed with attaching feet 26 which are secured in set positions upon the strip or bar 2 by set screws 27.

When this device is in use sheets of paper 28 and 29 are pinned or otherwise secured upon the board and a sheet 30 is engaged at its upper end with the clip 14. A plan view 81 of an object is drawn upon the sheet 30 and an elevation 32 thereof on the sheet 29. The

rulers 20 are set in desired angular relation 20 intersect at other corners of the figure 31 and dots are placed upon the sheet 28 at the intersection of the rulers 21. After all salient points of the figure have been plotted upon the sheet 28.with the pointer at the bottom of the figure 32, the bar is shifted to dispose the pointer at the top of the elevational view and the steps repeated. The dots upon the sheet 28 are then connected by lines and the perspective figure will be completed.

The terms and expressions which I have employed are used as terms of description and not of limitation, and I have no intention, in the use of such terms and expressions, of en:- cluding any equivalents of the features shown and described, or portions thereof, but recognize that various modificationsiare possible within the scope of the invention claimed.

Having thus described my invention what I claim is 1. Apparatus for plotting a perspective, comprising upper arms crossed adjacent their lower ends, spaced brackets mounted for individual adjustment toward and away from one another, one of said arms being mounted in each bracket for pivotal and longitudinal sliding movement, and lower arms crossed intermediate their ends and having their upper ends pivotally connected with thelower ends of the upper arms.

2. Apparatus for plotting a perspective comprising upper arms crossed intermediate their ends, and lower arms crossed intermediate their ends, bearings mounted for transverse movement and pivotally connecting adjacent ends of said arms and mounting the lower arms for transverse shift movement, and pivoted bearings mounting the upper arms for longitudinal sliding movement.

Apparatus for plotting a perspective comprising upper arms crossed intermediate their ends, and lower arms crossed intermediate their ends, brackets spaced transve sely from each other to extend horizontally over a drawing board, bearing sleeves pivoted to said brackets, said upper arms slidable longitudinally through said sleeves and erossed adjacent their lower ends, and mountings slidable transversely of the drawing board. the upper and lower arms having adjacent ends pivoted to each other by said mountings, the lower arms being secured to the, mountings in determined crossed relation to each other.

4. Apparatus for plotting a perspective comprising upper arms crossed intermediate their ends, and lower arms crossed intermediate ends, brackets spaced transverse- 1y from each other to extend horizontally over a drawing board, bearing sleeves pivoted to said brackets, said upper arms slidable longitudinally through said sleeves and crossed adjacent their lower ends, said lower arms crossed intermediate their ends, a frame to rest upon the drawing board, a cross bar shiftablc along said frame, mountings slidable along said cross bar, and means carried by said mountings to pivotally connect the upper and lower arms and secure the lower arms in determined crossed relation to each other.

5. Apparatus for plotting a perspective comprising upper arms crossed intermediate their ends, and lower arms crossed intermediate their ends, brackets spaced transversely from each other to extend horizontally over a drawing board, bearing sleeves pivoted to said brackets, said upper arms slidable longitudinally through said sleeves and crossed adjacent their lower ends, said lower arms crossed intermediate their ends, a frame having side strips to rest upon the drawing board, pulleys rotatably mounted adjacent ends of the side strips, belts trained about said pulleys, a cross rod extending between the side strips and having its ends connected with said belts, mountings slidable upon said rod, fingers extending from said mountings, bolts carried by said fingers and each. having a headand shoulder, the lower arms having their upper ends engaged about the bolts between their shoulders and said fingers whereby the lower arms may be se cured in desired angular relation to each other and shifted transversely with said mountings, the upper arms being loosely engaged about the shoulders of said bolts to establish pivoted connections between the upper and lower arms and cause pivotal and sliding movement to be imparted to the upper arms when the mountings are moved.

6. Apparatus for plotting a perspective comprising upper arms crossed intermediate their ends, and lower arms crossed intermediate-their ends, brackets spacedrtransversely from each other to extend horizon tally over a drawing board, bearing sleeves pivoted to said brackets, said upper. arms slidable longitudinally through said sleeves and crossed adjacent their lower ends, said lower arms cross-ed intermediate their-ends, a frame having side strips to rest upon the drawing board, pulleys rotatably mounted adjacent ends of the side strips, belt-s trained about said pulleys, a cross rod extending between the side strips and having itsends connected with said belts, mountings slid able upon said rod, and adjustable fasteners carried by said mountings, adjacent ends of the upper and lower arms being pivoted to the mountings by said fasteners, said fasteners when tightened securing the lower arms in determined angular relation to each other.

7. Apparatus for plotting a perspective comprising upper arms disposed in crossed relation to each other and being longitudinally slidable'an d pivotally mounted, depending guide members for said upper arms, lower arms disposed in crossed relation to each other belowthe upper arms, and means pivotally connecting the lower ends of said upper arms to the upper ends of companion lower arms.

8. Apparatus for plotting a perspective comprising upper arms disposed in crossed relation to each other and slidable longitudinally and pivotally mounted, lower arms disposed in crossed relation to each other below the upper arms, and means pivotally connecting the lower ends of said upper arms toupper ends of companion lower arms, said means releasably securing the lower arms in desired angular relation to each other and being movable to shift the lower arms transversely and impart pivotal and longitudinal sliding adjustment to the upper arms.

9. Apparatus for plotting a perspective comprising lower crossed arms, mountings to releasably secure said arms in determined angular relation to each other and mount the arms for transverse shifting movement, upper crossed arms pivoted at their lower ends to said mountings in concentric relation to mountings slidably receiving the upper arms.

RUDLOPH H. SAGHTLEBER.

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