US398865A - Drawing apparatus - Google Patents

Description

2 Sheets Sheet 1.

(No Model.)

D. K. WADE.

DRAWING APPARATUS.

No. 398,865. Patented Mar. 5.188,9.

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(No Model.) 2 Sheets--Sheet 2. D. K. WADE.

DRAWING APPARATUS.

vl/LGOOQO E UNiTEn STATES PATENT OFFICE.

DAVID K. XYAUE, OF MCPHERSON, KANSAS.

eRAwlNG APPARATUS.

SPECIFICATION forming part of Letters Patent No. 398,865, dated March 5, 1889.

Application filed September l, 1888. Serial No. 284,342. (No model.)

To all whom it may colte/171:

Be itI known that l, Davie K. WADE, a citi- Zen of the United lStates, residing at McPherson, in the county of McPherson and Stat-cof Kansas, have invented a new and useful Improvement in Drawing Apparatus, of which the following is a specification.

The invention relates to a drawing apparatus adapted to accurately represent upon ilat surfaces views of landscapes, building, audof the telescope is altered. The out end of the shaft is provided with a thumb-wheel to is pivotcd to an intermediatepoint of the revother objects remote from the observer, the i 'ranged directly in rear of the rcvoluble dimensions and proportions ot'avliieh are dit'- cult to obtain. v

The invention consists in a certain novel construction and combination of devices, fully oluble standard, and the outer end` of this arm is connected to the telescope by the rod or wire ll, which maintains the said arm parallel with the telescope at all times.

K represents a small vertical shaft arstandard; and it consists of the spindle L, provided near its upper end with the vertically-adjustable collar l, having a set-screw,

set forth hereinafter in connection withthe accompanying drawings, and pointed out in the appended claims.

speeiicall y In the drawings, Figure l is a perspective 1 View' of a drawing apparatus embodying my improvements arranged in the opera-tive position. Fig. 2 is a side view of the same, partly in section. Fig. 3 is a detail vertical sectional View of the upper end of the revoluble standard, taken transversely to show the means for operating the telescope.

Fig. is a side view y of the device adjusted to copy or enlarge Fig. 5 is an enlarged longitudinal pictures.

of the tubular arm and pencilsectional view bar. Fig. 6 is same. shaft.

m, and the sleeve or barrel L', mounted on the said spindle and provided with a peripheral slot, m', near its lower end, which embraces the adjustable collar. It will be understood that by altering the position of the adjustable collar the said shaft may be extended or contracted at will, and the upper portion thereof-namely, the sleeve or barrel L-is revoluble. f

N represents a tubular arm, which is pivoted at its inner end to the upper end of the vertical shaft Kmnamely, to the tubular upper portion, L', thereofand is connected near its outer end to the extremity of the swingan enlarged side view of the Fig. T is a detail view of the vertical ing arm G by means of the short linlmt. This tubular arm is pivoted to the shaft so as to swing vertically, and is provided adjacent to Referring by letter lo the drawings, A desy ignates the base of the improved drawing apparatus, to which, at one end, attached the vertical drawing board or plane E, on which is adapted to be placed the paper to receive vthe representation, and C designates a vertical revoluble standard mounted on the base near the other end, in thebifurcated or forked upper end of which is swiveled the telescope D. A block, d, is pivoted in the bifurcated or forked end of the standard, and is provided with an aperture, d', in which fits the telescope, and the same is clamped therein by i i between the operator and the object to be a set-screw, d?. A transverse shaft, E, is

mounted in the upperend of the shaft C unj der the telescope, and is provided with a S its inner end with a slotted or hollow offset, O, which embraces the vertical standard and allows the tubular arm to swing freely with the hollow portion of the shaft K.

The pencil-bar P is mounted in the tubular arm and projects beyond the outer end of the latter, and is provided with a retractin g-sprin g, p, which is adapted to normally hold the bar drawn away from the drawing board or plane.

The operation of the device is as follows: Having secured the paper to receive the representation on the drawing board or plane, and having arranged the said board or plane represented, the telescope is directed successively toward the various salient points of the object, and as each point is sighted the pencil-bar is extended and a dot or mark is made on the paper. In this way the outline and IOO other points of importance are indicated on the paper, and after the latter has been removed from the machine the lines may be readily filled in by the operator. 5 The obj ect in pivoting the tubular arm out of alignment with the telescope is as follows: If the drawing-board or. the surface on which the drawing is being made is concavely curved and concentric with the pivot of the telescope 1o the end of the pencil-bar would be equidistant from the board at all times, and therefore if the tubular arm. were pivoted in alignment with the telescope an accurate drawing would be produced; but when the drawing is made on a plane or flat surface it will be obvious that as the telescope is swung around its center the end of the pencil-bar will approach or recede from the surface, and in no two positions will it be at the same distance zo therefrom. It will be obvious that this change of distance will materially affect the accuracy of the drawings produced'as, for eX'- ample7 suppose two points, a b, to be made on the drawing-paper, Fig. 1, respectively on opposite sides of the vertical standard, the said points being in the same horizontal plane and made without altering the vertical adjust# ment of the telescope. Now suppose it is desired to make a point in the same plane 3o intermediatev between the said points a b; therefere the end of the telescope swings around lin the same horizontal plane as before and the end of the pencil-bar swings aroundinrthe samehorizontal plane as before; but when the said pencil-bar is extended to make the point it reaches the plane of the drawing-board sooner (that is, with less eXtension) than when the points a l) were made, and consequently the point c will'be `below the 4o plane of the said peints if the telescope is inclined upward and above the plane of the said points if the telescope is inclined downward. Now, to overcome this inaccuracy, I pivot the tubular arm out of alignment with the telescope, and then as the end of the telescope travels in a horizontal line (following the line of the object) the endV of the pencil-bar travels in a curved line, which is conveXed upward if the telescope .is inclined upward,

5o and convened downward if the telescope is inclined downward. What has been stated with respect to horizontal lines also holds true with respect to vertical lines. As the end of the telescope is moved downward in a vertical 5 5 line, (following the line of the object,) the end of the pencil-bar travels in a path which is YcnveXed outward, the'cen'ter'of the saidconveiity being in the horizontal plane ofthe innerv end of the tubular arm.

6 s In Fig. 4 I have shown a vertical board, R, secured to the rear end of the base, on which is adapted to be arranged a picture to be reproduced and enlarged on the other board,

and the telescope is reversed in the upper end of the standard, so that it is directed toward the board R, and it is arranged in the pivoted block so that its object end is close to the board R. It will be evident that the lines produced by the end of the pencil-bar will be much longer than those traced by the end of the telescope.

Having thus described the construction,

operation, and advantages of my invention, I claim- 1. The combination, with the Yrevoluble standard, of the telescope swiveled at the upper end of the standard and provided with a segmental rack, F, the transverse shaft provided With a spur-wheel engaging the said rack, the tubular arm pivoted at its inn-er end and connected at its outer end to the telescope, and the pencil-bar mounted in the tubular arm, substantially as specified.

2. The combination, with the revoluble standard and the telescope mounted on the standard, of the pencil-bar mounted eccentrically 4with the telescope and connected fahereto at its free end, substantially as speci 3. The combination, with the revoluble standard and the telescope mounted thereon, of the vertical shaft arranged in rear of and adjacent to the standard, the tubular arm mounted on the shaft and connected to the telescope, and the pencil-bar mounted in the tubular arm, substantially as specilied.

4, The combination, 'with the revoluble standard and the telescope swiveled at the upper end of the standard, of the vertical eX- tensible shaft arranged adjacent to andy in rear of the standard, the tubular arm pivoted to the upper end of the said shaft and provided with a hollow or slotted offset embracing the standard, and the pencil-bar mounted in the tubular arm, substantially as specified.

Y 5. The combination, with the vertical revoluble standard C, of the telescope swiveled to the upper end of the standard and provided with suitable means, substantially as described, for operating the same, theswinging arm Gr, mounted on 'the standard and connected by a rod or wire, H, to the telescope, the tubular arm pivoted at one end to a vertical shaft arranged adjacent to the standard, and connected at the other end to the swinging arm by a suitable link, and the spring actuated pencil-bar mounted in the tubular arm, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto aiiixed my signature in presence of two witnesses. Y

DAVID K. \VADE.

lVitn csses:

J. H. SIGGERs, R. J. MARSHALL, Jr.

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