US1246405A - Dot-and-dash device. - Google Patents

Description

R. T. ENGELBRECHT.

DOT AND DASH DEVICE.

' APPLICATION FlL ED NOV. 4. I916.

Patented Nov; 13, 1917.

mvmNToR Robert IErgeZbrecht WITNESSES:

return STATES PATNT CE ROBERT '1. ENGELBREGHT, or oAKtANnoALIFoRNIA;

nor-Ann-nAsH DEVICE.

To all whom. it may concern:

Be it known that I, ROBERT T. ENGEL- BKECHT, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improvements in Dot-and- Dash Devices, of which the following is a specification.

This invention relates to a dot and dash device.

It is an object of the present invention to provide a pen and ruler, whereby dotted or broken lines of varying formations may be drawn; and particularly to provide a T-square or straight edge, one or both edges of which are corrugated or inlaid with toothed strips, and in conjunction therewith to provide a simple, easily applied ruling pen attachment which is adapted to engage the corrugated or toothed edge and intermittently raise the pen as it is run along the edge. Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a perspective view, showing the drawing pen attachment and the ruler, whereby the dotted lines are formed.

Fig. 2 is a perspective view of the drawpen attachment.

Fig. 3 is an enlarged view of theruler.

In drawing dotted or broken lines in an ordinary manner with a drawing or ruling pen, it is necessary to lift it out of contact with the paper at certain and regular intcrvals. To produce such dotted lines of neat appearance requires considerable time and experience, if the work is to be neatly done. The lifting of the pen, in the present instance, is facilitated mechanically by a finger which is secured to the drawing pen and which engages a toothed rack or similar device.

Referring to the drawings in detail, A indicates, in general, a common drawing or ruling pen, comprising a handle 2, a pair of blades 3, which may or may not be hinged together at the point 4, and a thumb-screw 5. B indicates the ruling pen attachment. This is preferably stamped out of a suitable form of sheet metal and consists of a pointed finger 6, a pair of clamping lugs 7, which are adapted to frie Specification of Letters Patent. Patented Nov, 13 1917, Application filed November 4, 1916. Serial m. 129,496.

tionally engage and embrace one of the blades of the pen, and an upwardly projecting stop h1g8 which is engageable with the projecting end 9 of the thumb screw 5 to maintain the point of the. finger at a fixed elevation with relation to the point of the pen. The clamping lugs employed have sufficient tension to hold the finger at any point of elevation desired with relation to the point of the ruling pen. This is of considerable importance as it permits T- squares or straight edges of varying thicknesses to be employed.

The edge of the T-square or guide C with which the finger engages to produce a broken or dotted line consists of a thin metal plate 10. This plate is either corrugated or provided with toothed projections, such as indicated at 11. The plates may be secured in any suitable manner, but preferably, as here shown, by forcing the plates into undercuts, such as indicated at 12, which are formed in the main stock of the T-square or ruler.

By referring to Fig. 1, ,it can readily be seen that if the pen is run along the edge of the square. indicated at 14, the finger will engage the toothed plate and intermittently raise the pen away from the paper. The dotted lines, such as indicated at 15, are thus formed. The opposite plate produces a dot and dash line, such as indicated at 16.

The attachment B is simple in construction and as it is secured entirely by the frictional engagement of the spring clamp,

it can be readily removed or applied as the work or necessity demands. A positively uniform broken line havinganv formation desired may be obtained by arranging the teeth or corrugations, as desired. and as no skill or care is required, it is obvious that perfect, uniform work will always be secured.

The materials and finish of the several parts of the device are such as the experience and udgment of the manufacturer may dictate.

It is to be noted that in order to do straight line work thefinger does not have to be removed from its position on the pen. All that is required to do straight work is to turn the pen around and use a rule or T-souare in the ordinary way of ruling, making the change from dot and dash work to straight line work instantaneous.

Having thus described my invention, what I claim and desire to secure by Letters Patent is An attachment for ruling pens for use with a guide having an undulating track associated therewith, composed of a sheet metal member of approximate cruciform, thearms of which are bent inwardly t0- ward each other to form a pair of independent spring clamps for engagement over opposite side edges of one blade of the pen, the lower leg of the member being formed Copies of (this patent may be obtained for to engage the track and the top of the member being extended upwardly to engage the adjusting screw of the pen blades whereby to limit the extent of movement of the member relative to said screw.

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

ROBERT T. ENGELBRECHT.

Vitnesses JOHN H. Hnnnnre, VJ. W. HEALEY.

five cents each, by addressing the Commissioner of Patents.

Washington, D. C.

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