US1267665A - Straight-edge attachment. - Google Patents

Description

H. H. HUNDLEY.

STRAIGHT EDGE ATTACHMENT.

APPLICATlON FILED .IUNEZQ, 1917.

1,267,665. Patented May 28,1918. 7

HAROLD H. HUNDLEY, 0F PANTHER, WEST VIRGINIA.

STRAIGHT-EDGE ATTAGHMEN T.

Specification of Letters Patent.

Patented May as, 1918.

Application filed June 29, 1917. Serial No. 177,780.

To all whom it may concern:

Be it known that I, HAROLD H. HUNDLEY, a citizen of the United States, and a resident of Panther, in the county of McDowell and State of West Virginia, have invented a certain new and useful Improvement in Straight-Edge Attachments, of which the following is a specification.

The present invention relates to drafting instruments, and has for an object to provide an attachment to a straightedge for supporting the same and making unnecessary the use of the usual parallel rule.

The invention provides a pair of heads or brackets with rollers to move over the surface of the drawing and to support a straight edge, the brackets or heads being provided with improved means for gripping the opposite ends of the straight edge to support and carry the same during the adjustments of the device.

The above, and various other objects and advantages of this invention will be in part described, and in part understood, from the following detailed description of the present preferred embodiment, the same being illustrated in the accompanying drawing where- 1n Figure 1 is a side elevation of a pair of the devices of this invention as applied to a straight edge.

Fig. 2 is a side elevation of one of the heads or brackets employed, the view being enlarged and showing the clamp employed.

Fig. 3 is an outer end view of the bracket.

Fig. 4 is a longitudinal section taken sub stantially centrally through the bracket, showing the mounting of the roller therein and the arrangement of the clamp element.

Fig. 5 is an inner end view of the bracket or head.

Referring to this drawing, 10 designates the block or head which may be of any suitable fanciful configuration, and which is preferably provided with opposed upwardly inclined and converging sides forming a lug 11 upon the top of the block 10 by means of which the block may be grasped between the fingers. The block 10 is provided near one end, and in its under side with a transversely extending recess 12 in which is seated a. roller 13. As the recess 12 is formed near one end of the block 10, the end portion of the block provides a bracket arm 14: adapted to receive therethrough a screw or pin 15 upon which the roller 13 is mounted.

The screw or pin 15 extends inwardly through the bracket arms 14 and the roller 13, and is preferably threaded into the body portion of the block 10 by returning the pin in place and holding the roller 13 within the bracket part of the block, The roller 13 extends downwardly from the under side of the block 10 a short distance to hold the block 10 in spaced relation from the surface over which the roller 13 may be moved.

The opposite or inner end of the block 10 is provided with a pair of Vertically spacedapart fork arms 16 and 17, which, as shown in Fig. 5, are relatively flat. The arm 16 is preferably made in a separate piece secured at its inner end against the lower base portion of the block 10 by screws 18 or the like, as shown in Fig. 4.

Between the fork arms 16 and 17, there is arranged a clamping plate 19 which is swiveled upon the lower end of a set screw 20 provided with a narrowed head adapted to be turned for raising and lowering the clamping plate 19. The clamping plate 19 is relatively long and narrow to conform with the width and substantially to the length of-the fork arms 16 and 17, and the plate 19 is held from turning upon the screw 20 by means of guide pins or studs 21 which pass downwardly through openings in the upper arm 17 of the block, and which have screw-threaded engagement with the clamping plate 19 at their lower ends.

Preferably, the roller 13 is provided with transverse corrugations in its peripheral surface to thus insure the uniform moving or advancing of the opposite ends of a straight edge which may be secured between a pair of the blocks, and to afford a firm purchase of the roller 13 upon the surface over Which the block is moved.

In use, a pair of the blocks 10 is employed, and the blocks are secured upon the opposite ends of a straight edge A, or othersuitably formed flat bar. The ends of the bar or straight edge A are engaged between the fork arms 16 and 17 and the screw 20 is turned in a direction to advance the clamping plate 19 against the upper face of the straight edge A. The straight edge A is thus clamped at its end between the clamping plate 19 and the lower fork arm 16 to firmly secure the block 10 upon the end of the straight edge. The arms 16 and 17 are preferably of a width equal to that of the straight edge A, and are clamped in position thereon in lOllglttlClillfil alinenient with the straight edge so that the rollers 13 travel in paths at right-angles to the longitudiiial axis of the straight edge.

When the devices are thus secured to the opposite ends of the straight edge, the lugs or projections 11 may be engaged between the fingers of the opposite hand and the straight edge may thus be advanced over the desired surface.

It is of course understood that various changes and modifications may he made in the details of construction, and in the design of the parts of the above specifically described attachment without departing from the spirit of this invention, and being restricted only by the scope of the following claims.

I claim:

1. The combination with a straight edge, of a pair of blocks, a roller mounted transversely in one end of each block and projecting therebelow, and clamping means can ried upon the other end of each block for bindin engagement with the o 1 Josite ends b L. V

of the straight ed e and for supporting the same for movement in an edgewise direction.

2. In a drafting instrument the combination of a block, a roller seated in the lower face of the block and projecting therebelow to support the block, said block being provided with a pair of spaced-apart arms laterali extending therefrom, and clamping means carried by one of said arms to clamp a straight edge against the other arm.

3. In drafting instrument the combinationot a block provided with an upwardly extending lug adapted to be grasped by the fingers, a roller seated in the lower face of the block, a pair of arms extending laterally from and in vertically spaced-apart relation to the block, a clamping plate arranged between said arms, and a set screw carried by one of the arms and having engagement with said clamping plate to advance the same toward the opposite arm for clamping a straight edge between said arms.

at. In a drafting instrument, the combination of a block provided with an upstanding lug adapted to be grasped between the lingers, a roller seated in the lower face of the block for supportlng the same, a pair of arms extending from one side of the block and adapted to receive one end of a straight edge therebetween a clamping plate mounted between said arms, a set screw swiveled to the clamping plate and engaging one of said arms and guiding means carried by the clamping plate and engaging the said arm to hold the clamping plate from turning with said set screw.

HAROLD H. HUNDLEY.

Gopies of this patent may be obtained for five cents each, by addressing the Gommissicner of Patents, Washington, D. ti.

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