US884844A

US884844A - Circle-drafting instrument.

Info

Publication number: US884844A
Application number: US39062107A
Authority: US
Inventors: Charles L Nichols; Raleigh Hogan
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-08-29
Filing date: 1907-08-29
Publication date: 1908-04-14
Anticipated expiration: 1925-04-14

Description

WITNESSES:

0. L. NICHOLS & R. HOGAN.

PATENTED APR. 14, 1908,

CIRCLE DRAFTING INSTRUMENT.

APPLICATION FILED AUG. 29, 1907.

2 SHEETS-SHEET 1.

rm: NORRIS PETER5 CO. \YA

INVENTORS.

harles L.Nic11o1s A BY Raleigh Hogan.

A TTORN E Y.

PATENTED APR. 14, 1908. G. L. NICHOLS & R. HOGAN.

CIRCLE DRAFTING INSTRUMENT.

APPLICATION FILED AUG. 29, 1907.

2 SHEETS-SHEET 2.

a 20 p in WITNESSES: INVENTORS GA/m Charles L Nichols a 777 772 W By Raleigh Hogan.

ATTORNEY.

m: rmmus pz-rsns :0, WASHINGTON, n. L:

PATENT @FFTCE.

CHARLES L. NICHOLS AND RALEIGH HOGAN, OF FRANKLIN, INDIANA.

CIRCLE-DRAFTIN G INSTRUMENT.

Specification of Letters Patent.

Patented April 14, 1908.

Application filed August 29, 1907. Serial No. 390,621.

To all whom it may concern:

Be it known that we, CHARLES L. NIoHoLs and RALEIGH HOGAN, both of Franklin, county of Johnson, and State of Indiana, have invented a certain new and useful Circle-Drafting Instrument; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which like letters refer to like parts.

Our invention relates to improvements in drawing instruments adapted to form curves that may represent the arcs of circles of dimensions too great to be made conveniently by ordinary instruments.

This invention is peculiarly adapted for making drawings for patterns where arcs of large circles are to be drawn. For that purpose the instrument is longitudinally adj ustable so that such arcs may be drawn without making any measurements or calculations with reference to the center of the are. This renders the instrument very valuable in drafting sheet metal patterns, cutting glass, making railroad curves and the like.

The nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings Figure 1 is a side elevation of the device with a part centrally broken away. Fig. 2 is a plan view of the device. Fig. 3 is a central longitudinal section of the device with the ends broken away. Fig. 4 is a rear view of the device. Figs. 5 and 6 are diagrams showing the manner of using the device.

Referring now to the details of the construc tion of the device herein shown for the purpose of illustrating our invention, there is a longitudinally extending rod 10 on the forward end of which a bracket 11 is secured that has a portion 12 projecting beyond the forward end of the rod horizontally and provided with a central vertically disposed hole in which a caster-frame 13 extends so as to turn for adjustment. This caster-frame has a shoulder for supporting the projection 12 of the bracket 11 and the upper part of said caster-frame is a threaded rod adapted to receive the washer 15 and the knurled nut 16 which clamps down upon the projection 12 of the bracket 11 and thus clamps the casterframe rigidly in any desired position. The lower end of the caster-frame is vertically slotted at 17 and in said slot the caster-wheel 18 is mounted, said wheel being a disk with a sharpened periphery so that it will travel very accurately over drawing paper and should be mounted so as to have as little play as possible in order to contribute to accuracy in the operation of the instrument. A still wire or finger 19 is secured in said caster-frame and projects forwardly and is used for indicating the direction of the front wheel and measuring angles.

The rearward end of the main rod 10 is supported by the following means: The rear axle 20 has the wheels 21 mounted upon its ends. These wheels are mounted as accurately as possible so that they will have little play and yet move freely. Their peripheries should also be rather sharp so they will travel accurately over drawing aper without slipping. On said axle a tubu ar bearing 22 is mounted. The ends of said bearing are split and externally threaded and upon the same the knurled nuts 23 are secured for clamping the bearing on the axle. A sleeve 24 is integral with and transversely secured upon bearing 22 and at an absolute right angle therewith for the purpose of receiving the main rod 10 so that the whole rear carriage may be slipped longitudinally of said rod. One end of said sleeve is split and threaded for the knurled nut 25 whereby the sleeve may be clamped in any desired position upon said rod. By this means the rear support for said rod can be adjusted longitudinally thereof so as to increase or diminish the distance between the front wheel and the pencil 26 which extends downward from the tubular bearing 22 and is held in the pencil holder 27.

A quadrant 30 is mounted on the caster frame 13 so as to rotate said caster frame and adjust the angle of the front wheel 18 with reference to the main rod 10. Said quadrant is actuated by the worm 31 mounted in the bearing 32 that extends transversely of the main rod and is clamped thereto by the set screw 33. This enables said bearing to be adjusted on said rod 10. The worm is actuated by a finger wheel 34 and the worm is moved up so as to mesh with the toothed periphery of the quadrant and actuate said quadrant. The outer edge of the quadrant moves in and is guided by a horizontal slot in the worm bearing 32 and upon said quadrant there is a scale 36 to indicate the angle at which the front wheel 18 is or may be set. For accurately and finely adjusting the quadrant the finger wheel 34 has a minute scale. The disk 134 on bearing 32 beside the wheel 34 has an indicating mark on it and the arrangement is such that one revolution of the wheel 34 will move the quadrant one degree. This permits minute adjustment of the quadrant.

In operation when it is desired to trace the arc of a large circle and the degree of curvature of that are is known the device is set by turning the worm and quadrant so as to bring the desired degree mark on the quadrant over the center of the main rod 10 and then the front nut 16 is clamped so as to hold the front wheel at the angle to which it is adjusted. Then the device as a whole is moved over the drawing paper and the pencil thereon will trace the desired curve or arc, however great the circle might be if completed.

For making drawings for patterns, sheet metal work and the like, this invention is peculiarly well adapted and can be used for that purpose without the need of any calcula- For illustration, if one desires to draw tions. approximately the frustum of a hollow cone 01 certain dimensions, such as shown in Fig. 6,

there is usually given the dimensions of the two circumferences AB and OD and the length of the cone M N. These are drawn in straight lines as indicated and the problem is to draw the proper are for the top and bot tom of the cone so that when the sheet of metal is rolled into conical shape, the two ends will be in parallel planes. After the lines AB, CD and MN are drawn, with the line MN bisecting said lines AB and CD, the corresponding ends of the lines AB and OD are connected to form the side lines AC and BD, or at least one of them, say BD. Then the line G-E is drawn so as to bi-sect lines B-M and N-D. Then the line BEL is drawn from the point D at right angles to BD. Then line EF is drawn from the point at a right angle to the line G-E. Then the pointer or pencil of the machine is placed on the point E and the front wheel is turned to an angle that will cause the pointer 19 to parallel the line EF so as to give the front wheel the desired angularity to describe the arc AB. By clamping the front wheel in the position thus indicated and moving the instrument over the drawing pa er the pencil or marker will indicate the arc -B. In the same way the arc C-D is drawn. Or suppose the pattern desired is for a breast, as shown in Fig. 5. There the diameters of the vessel to be constructed are given, AB, CD and also the height M-N. These lines are drawn as in Fig. 6, above described and the arcs AB and CD are determined in the same manner as the arcs described in Fig. 6, ex-

l/Vhat We claim as our invention and desire to secure by Letters Patent is:

1. A drawing instrument including a rod, a wheel mounted caster-like for supporting one end of said rod, means for clamping it at any desired angle with reference to the rod, a pair of wheels and means carried by said pair of wheels for supporting the other end of the rod, the distance between said front and rear Wheels being adjustable longitudinally of the rod; substantially as and for the purpose set forth.

2. A drawing instrument including a rod, a bracket secured to one end of said rod and caster-frame mounted vertically in said bracket, a wheel mounted in the lower end of said frame, means for clamping said casterframe in said bracket so as to hold the said wheel at any desired angle with relation to the rod, wheels for supporting the rear end of said rod, an axle on which said wheels are mounted, a sleeve-like bearing in which said axle is mounted that is long1tudinally slidable on said rod with one end thereof threaded and split, and a nut for clamping said sleeve in any desired position on said rod.

3. A drawing instrument including a rod, a bracket secured to one end of said rod and caster-frame mounted vertically in said bracket, a wheel mounted in the lower end of said frame, means for clamping said casterframe in said bracket so as to hold the said wheel at any desired angle with relation to the rod, wheels for supporting the rear end of said rod, an axle on which said wheels are mounted, a sleeve-like bearing in which said axle is mounted that is longitudinally slidable on said rod with one end thereof threaded and split, a nut for clamping said sleeve in any desired position on said rod, and a lead pencil holder extending down centrally from the bearing for said axle.

4. A drawin instrument including a rod, a pair of whee ls for supporting one end of said rod, a single wheel mounted caster-like on the other end of said rod for supporting the same, said wheels being adjustable on said rod with relation to each other a scale marked. segment for adjusting the angle of said single wheel with relation to said rod, means for clamping said single wheel in position when adjusted, and means mounted on said rod for engaging the periphery of said segment and actuating the same.

5. A drawing instrument including a rod, a pair of wheels for supporting one end of said rod, a single wheel mounted caster-like on the other end of said rod for supporting the same, a scale marked segment for adjusting the an tion to said rod, means for clamping said single wheel in position when adjusted, means mounted on said rod for engaging the periphery of said segment and actuating the same, and a finger projecting forward from the 'le of said single wheel with relameans in which said front wheel is mounted that indicates the angle at which said wheel is set.

6. A drawing instrument including a rod, a bracket secured on one end thereof, a caster frame mounted vertically in said bracket, a wheel on the lower end of said frame, a segment mounted on said casterframe that is horizontally disposed and has a toothed periphery that is provided with a scale, means for clamping said caster bracket in position to hold said wheel at any desired angle with relation to said rod, a pair of rear wheels, means slidably mounted on said rod on which said rear wheels are mounted, means for clamping the same in any desired position on said rod, a frame mounted on said rod with a horizontal slot in it in position for the periphery of said segment to fit and move in said slot, a worm mounted in said frame transversely of said rod that engages the toothed periphery of said segment for actuating the same, and means for operating said worm, substantially as set forth.

In witness whereof, we have hereunto af- 25 fixed our signatures in the presence of the witnesses herein named.

CHARLES L. NIOHOLSQ j RALEIGH HOGAN.

lVitnesses: V. H. LOCKWOOD,

OLIVE BREEDEN.