US1021583A - Drawing instrument. - Google Patents

Description

J. DZIERWA.

DRAWING INSTRUMENT.

APPLIUATION IILED JUNE 5, 1911.

' 1,021,583. Patented Mar.26, 1912.

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DRAWING INSTRUMENT. "APPLIOATION FILED 1111135, 1911.

1,021,583. Patented Mar. 26, 1912.

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DRAWING INSTRUMENT.

APPLICATION II/LBD JUNE 5, 19 11.

' Patented Mar. 26, 1912.

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JOHN DZIERWA, OF ST. LOUIS, MISSOURI.

DRAWING INSTRUMENT.

To all whom "it may concern:

Be it known that'I, JOHN DziiiRwA, a citizen of the United States, residing in the city of St. Louis and State of Missouri, have invented certain new and useful Improvements in Drawing Instruments; and I do :declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to drawing instruments, more particularly of that character which are intended for drawing ellipses, ovals, circles, and the like; and the object of the same is to produce an instrument that can be so used and wherein all parts, excepting an ordinary yardstick or the like, may be folded into small compass. This object is accomplished by the construction hereinafter more fully described and claimed and as shown in the drawings wherein:

Figure 1 is a top plan view showing the manner in which the device is employed; Fig. 2 is a side view of the invention; Fig. 3 is a similar view of the beam detached; Fig. 4 is a verticalsectional view of one of the posts, showing more particularly the pin fastening means thereof; Fig. 5 is a horizontal sectional view on line 5-5 of Fig. 4; Fig. 6 is a view of the several parts of the mechanism for adjustably securing the posts to the beam; Fig. 7 is a top plan view of the cross member in a folded position; Fig. 8 is an enlarged side view of a portion thereof; Fig. 9 is a vertical sectional view on line 99 of Fig. 8; Fig. 10

is a detail perspective view of one of the supporting and retaining feet.

8 alternately disposed with catches which latter comprise each a member 9 secured to one side of the arm opposite the hinge 8 and having an outstanding rib 10 and a member 11 secured to the same side of the adjacent arm and having a hook 12 at its free end adapted to engage said rib when the two sections of the arm stand in alinement as Specification of Letters Patent.

Application filed June 5, 1911.

Patented Mar. 26, 1912.

Serial No. 631,213.

seen in the drawings. In order to prevent this cross from slipping over the pap-er or board upon which the drawing is to be made, it is provided with feet 13 on its under side as best seen in Fig. 8, and these feet are by preference repeated at the outer end of each section of each arm. hinges and catches are by preference of metal, whereas the arms of the cross and its rigid center may all be of wood; and of course the exact shape, the proportions, and the sizes of parts are immaterial. The other element of this instrument is made up of a ruler which may well be a yardstick as lettered Y herein, and three elements or members which I will now specifically describe.

These and the- Each-has an upright body 20 provided across its upper end with a transverse slot 21 of a size to receive the ruler or yardstick Y; and the solid member or guide member 30 has the remainder of its body made solid and a pin 31 projecting from its lower end and of a size to slide freely within the groove 6. One member has a spring actuated catch 42 for holding a steel point 43 whose body is grooved as at 44 so that the catch may engage it at different heights and permit the point proper to project to different degrees. The lower end of this mem- V ber is by preference formed with a pin 41, similar to the pin 31 except that it is tubular to permit the steel point to pass through it; and when this point is removed the two pins 31 and 41 serve as guides in a nanner which will be described below. The third member has a spring catch 52 much like that nuin' bered 42.exceptthat it is shaped to engage the body of a pencil 53 which also may be set under this catch so as to project to greater or less extent as desired; and this member omits the pin at the lower end of at the upper ends of all these three members are alike, and a description of one will suffice for all. levers 60 having side ears 61 pivoted as at 62 to the upper end of the fork of the member at each side of its slot 21, the lower ends of said levers bearing upon a shoe 63 which slides along the upper edge of the yardstick Y, and their upper ends forming thumbpieces which may be compressed between the thumb and finger of the operators hand. The inner faces of said thumb-pieces are socket-ed as 65 to receive the extremities of an expansive coiled spring 66 which nor- Each comprises two L-shaped iie mally throws them apart and depresses the shoe so as to frictionally bind upon the upper edge of the yardstick and therefore hold this member in adjusted position. When it is desired to move it along the same, the thumb pieces are pressed together against the tension of this spring and the whole member can then be moved and set as desired, after which the pressure is relieved and the expansion of the spring holds the member so adjusted.

In the use of this device for drawing plain pencil circles, the steel point is 1nserted in the member 40 and the pencil in the member 20, and the said pencil is swung around the center in a manner which will be clear, the tips of both the point and the pencil projecting below the pin 31 at the lower end of the member 30. Or the point may be inserted in the hole 7 at the center of the cross, and the pencil will travel around upon the paper or board between its arms and must be lifted over them as they are encountered. To draw or scratch lines upon wood or metal, a metal point or pin is substituted for the pencil and the operation is the same. WVhen this instrument is used to draw ovals, the point is removed from the member 40 and the two pins 4L1 and 31 are seated in the grooves 6 with the pencil depending from the third member, and then the entire yardstick Y is swung around by the operators hand which grasps the pencil and the member which carries it, one pin moving along the groove in two alined arms and across the center, then the other pin moving inward in a direction at right angles thereto and across the center, then the first pin returning across the center, and so on in a manner which will be clear. VVhet-her drawing circles or ovals, all the members are set on the yardstick by the means above described, according to the size of the oval or circle that is to be struck. hen this device is not in use the members are removed from the yardstick and the arms of the cross are folded up into small compass as shown.

\Vhat is claimed as new is:

1. In a drawing instrument of the class described, the combination with a stick, members adjustably mounted thereon and two of them having pins at their lower ends, and a marking device carried by the third; of a cross comprising a rigid center, foldable arms comprising sections hinged to the outer ends of the arms of said center, the hinges between the sections of the foldable arms being alternately on opposite sides of said arms, and catches disposed opposite the hinges, the upper edges of said arms and sections being grooved for the reception of said pins.

2. In a drawing instrument of the class described, the combination with a stick, members adjustably mounted thereon, and two of them having pins at their lower ends, and a marking device carried by the third;

:of a cross comprising a rlgid center, foldable arms comprising sections at the outer extremities of the arms of said center, a. hinge at one side of each joint between said arms, and a catch at the other side of such joint comprising one member having an out-turned rib and another member having an inturned hook adapted to engage the rib when the parts are in alinement, all arms having grooves in their upper edges adapted for the reception of said pins.

3. In a drawing instrument of the class described, the combination with a stick, members adjustably mounted thereon and two of them having pins at their lower ends, and a marking device carried by the third; of a cross comprising a rigid center, foldable arms comprising sections at the outer extremities of the arms of said center, a hinge at one side of each joint between said arms, a catch at the other side of each such joint comprising one member having an out-turned rib and another member having an inturned hook adapted to engage the rib when the parts are in alinement, all arms having grooves in their upper edges adapted for the reception of said pins, and feet depending from the lower edges of the center and of each of said sections.

4. In a drawing instrument of the type described, the combination with a stick, and members thereon each having a transverse slot through its upper end adapted to re celve said stick; of brackets at opposite sides of the slot in each member, two L- shaped levers having knuckles at their angles lapping each other and standing between said brackets, a pivot pin through the brackets and knuckles, an expansive spring between the upper ends of said levers, and a shoe beneath their lower ends adapted to bear upon said stick.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN DZIERIVA.

W'itnesses:

JOHN A. ANDERSON, LOUIS E. RoBER'rs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0.

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