US523733A

US523733A - Drawing-instrument

Info

Publication number: US523733A
Authority: US
Publication date: 1894-07-31
Anticipated expiration: 1911-07-31

Description

(No Model.) l`

E. L. SA1\IDERSO1\I.` DRAWING INSTRUMENT.

10.523333 'PatentgqJuly 31, 1394. l

WSW@ M+@ Amm/vers.

YH: clams PETERS co.. PHOTO-LINO.. WASHINGTON. c,

A l l UNITEDSTATES' PATENT Gratos.

EDMUNDy L. sANDERsoN, oF

DRAWING-INSTRUMENT.

vwAiTHAM, MAssAoHIsETTs.

SPECIFIGATIN forming part of Letters Patent No. saavsadatea July 31, 1894.l Application filed .nine 1'7, 1893. semina l.tf/ 8.601. (No moan.)

To @ZZ whom 5mn/,y concern.' r Be it known that I, EDMUNDL. SANDERsoN,

of Waltham, in the county of Middlesex and State of Massachusetts, have invented a new and Improved Drawing-Instrument, of which Ythe following is a full, clear, and exact de# soription.

The invention relatesfto drawing instruments, and its object is to provide a new and improved adjustable triangle, which is 'simple and durable in construction, and arranged to permit of conveniently drawing lines at any angle to the T-square, and also lines perpendicularto each other.

The inventionconsists of an adjustable triangle comprising' a straight edgeand a blade pivoted thereon.

Th'einvention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointedfut in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of the improvement. Fig. 2 isa cross section of the same on the line 2-2 of Fig. 1. Fig. 3 is an enlarged face view of part of the clamping device. Fig. 4 is lan enlarged side elevation, with parts in section, of the clamping device, showing the several members disconnected. Fig. 5 is a plan view of the improvement in a different position from that shown in Fig. 1. Fig. 6 is a similar view of a modified form of the'improvement. Fig. 7,is a like view of another modified form of the improvement; and Fig. 8 is a similar viewv of still another modified form of the improvement.

The improved drawing instrument as illustrated in Figs. 1, 2, and 5 with a straight edge A, and with a lug 'B, in which is arranged a pivot C, connecting the lug B with an arm D, projecting from the base of a right-angle blade E in the form of a triangle as is plainly shown in the figures referred to. The blade E is adapted to be secured or clamped in place on a protractor G, riveted or otherwise fastened on the straight edge A, and having its center in the center of the pivot C. The clamping device F which is l used for this purpose is provided with a head F', conptersunk in the back of the blade E and provided with a threadedshank F2 on engage the protractor G at the inner edge thereof, 'as is plainly illustrated in Fig. 2. A nut F4 screws on the outer end of the threaded shank F2 to press the clamping plate F3 firmly `in contact with the protractor G. In order ing, I provide the head F with a pin ,F5 adapted to engage an apertureF6 in the saidv clamping plate F3. On the blade Eis secured a pointer H indicating on the graduation of theprotraotor G.

The ends of the straight edge A are preferably beveled, as illustrated in the drawings, and the lug B preferablyA forms part of the base of the protractor G, as shown in Figs. l, 5 and 6, so that the blade E is arranged in the same plane as the straight edge A. Now it will be seen that when the nut F4 of the clamping device F is loosened, the blade EA can be moved in any desired position, so as to bring its outer edge either in a parallel position relative to the straight edge A, as shown in Fig. 1, or in a right-angular position to the saidl straight edge, as illustrated in Fig. 5. When. the blade E is in the position shown in Fig. 5, then the operator can draw vertical lines on one edge of thev blade and horizontal lines on the upper edge of the said blade, and

Fig. 1, the angular lines drawn along the edges ofthe blade slant at an angle of forty-five ydegrees to the straight edge A.

It is understood that the angle of the edges of the blade E can be readily varied as desired, by swinging the blade on its pivot C,

tractor by the clamping device F. the pointer H indicating the degree of the desired angle. As illustrated in Fig. 6, the blade Eis made eled ends and is to be adapted to be clamped to the protractor G by a clamping device F7 similarin construction to the clamping device above mentioned and shown in Figs. 1to 5. In this case angu-lar'lines can only be drawn on one edge of the blade E. Otherwise the construction is the same; that is, the straight which is held a clamping plate F3 adapted to' :to prevent the clamping'plate F3 from turn! when the latter is in the position shown in in the shape of a straight edge having bev and then fastening it in place on the pro- IOC edge A carries the protractor G' having a lug B carrying the pivotC, for connection with the arm D of the blade E.

As shown in Fig. 7 the protractor is omitted and on the straight edge A2 is secured a lug B2 connected bya pivot C2 with an arm D2 of the triangular blade E2.

As shown in Fig. 8, the protractor is omitted and in place of the triangular blade E2 is used the blade E3 similar to the blade E', as above described. The straight edge A3 is provided with a lug B3 connected by a pivot C3 with the arm l) carrying the said blade E3.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. In a drawing instrument, the combination with a straight edge having beveled ends, of a blade pivoted to said straight edge and having an edge adapted to engage the beveled end of the straight edge and form an angle therewith, substantially as shown and described.

2. In a drawing instrument, the combination with a straight edge having beveled ends, and carrying a lug, of a blade having a projecting arm pivoted to the said lug, the lower surface of the blade engaging the beveled ends of the straight edge when the blade is in its lowest position to form an angle therewith, substantially as shown and described.

3. A drawing instrument, comprising a straight edge having beveled ends, a protractor provided with a lug and rigidly secured to said straight edge, and a blade having a projecting arm pivoted to the said lug and having an edge adapted to engage the beveled end of the straight edge and form an angle therewith, substantially as shown and described.

4. A drawing instrument, comprising a straight edge, a protractor provided with a lug and rigidly secured to said straight edge, a blade having a downwardly projecting arm pivoted to the said lug, and having an edge adapted to engage the endl of the straight u edge and form an angle therewith, and a fastening device substantially as described for clamping the said blade to the said protractor, as set forth.

EDMUN D L. SANDERSON. Witnesses:

H. P. FIELD, E. N. REU).