US3440727A - Scriber - Google Patents

Description

W. E. DANJCZEK April 29, 1969 SCRIBER Sheet Filed Dec. 5, 1967 Bvcsemmes and ATTORNEYS April 1969 w E. DANJCZEK- 3,440,727

SCRIBER Filed Dec. 5, 1967 Sheet 2 of 2 I NVENTOR M/Am/ f. 04/)75254 36m ana Semmes ATTORNEYS United States Patent 3,440,727 SCRIBER William E. Danjczek, Easton, Pa., assignor to Rapiodraph, Inc., Bloomsbury, N..l., a corporation of New Jersey Filed Dec. 5, 1967, Ser. No. 688,054 Int. Cl. B431 13/10 US. C]. 3323 2 Claims ABSTRACT OF THE DISCLOSURE A bushing is positively secured in the aperture of a base leg of a conventional lettering scriber by upper and lower flanges engaging the base leg. The bushing includes internal threads and an internal shoulder for engagement with external threads and a shoulder on the drafting pen.

BACKGROUND OF THE INVENTION Field of the invention Drafting: Scribers used in lettering or numbering.

Description of prior art Conventional scribers include a base arm supporting a drafting pen and a pivoted lever arm supporting a tracing pin. As the tracing pin engages a lettering or numbering guide, the drafting pen correspondingly inks the drawing paper. Earlier inventors have devised various brackets for supporting the drafting pen in the base arm. For the most part, these brackets have been mechanically complex and cumbersome. Hansen (3,218,717) employs a bracket which is mechanically securable to the base arm, and uses an internally threaded collar to support the drafting pen, but uses magnetic means for securing the collar and pen vertically with respect to the base arm. Other inventors such as Keuffel (2,050,057 and 2,050,- 058) and Morrison (3,192,629) have employed set screws for securing the drafting pen. Sellen (3,276,126) employs a bifurcated arm for securing various types of pens.

SUMMARY OF THE INVENTION According to the present invention the scriber base arm includes a bushing which is positively secured in the base arm and includes a plurality of internal threads, engageable with exterior, circumferential threads on the drafting pen. As the drafting pen is inserted through the bushing and threaded therein, the pen is compressed against a bushing locking shoulder, assuring securement of pen in bushing. Similarly, the drafting pen may be readily withdrawn by unscrewing from the bushing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the scriber, showing a base leg 12 with drafting pen 18 secured in bushing 20 and pivoted lever arm 22 with vertically depending tracing pin 24 engaging a lettering guide 26.

FIG. 2 is an enlarged front elevation partially in section, showing the drafting pen threaded in bushing 20, so as to compress abutting shoulders therein.

In FIG. 1 scriber 10 is shown as having base leg 12, supporting both height adjusting screw 14 and drafting pen 18 secured in bushing 20. Lever arm 22 may be conventionally adjustably pivoted to base leg 12 within knob 58 and includes at its free end tracing pin element 24, engaging lettering grooves 25 in lettering guide 26. As the 3,440,727 Patented Apr. 29, 1969 tracing pin 24 is manipulated in lettering grooves 25 by grasping knob 58, drafting pen point 52 engages paper 28 so as to make corresponding letters 30.

Base leg 12 may include tail weight 32 supported above a tail pin 34. Also, height adjusting screw 14 may be locked by means of knurled locking nut 16, so as to support the drafting pen point 52 at a predetermined distance above the drawing surface.

In FIG. 2 drafting pen 18 is illustrated as comprising a point section 36 having exterior threads 40 and a bottom shoulder 38 compressible against a corresponding inner shoulder 44 within the bushing 20.

Bushing 20 includes interior threads 42 engageable with the exterior threads of the pen 40, outer shoulder 46 engageable with a corresponding horizontal shoulder 48 in the base leg 12 and bottom flange 56, spun over against the bottom of the base leg 12. By maintaining tolerances closely when making the aperture for the bushing 20 in base leg 12, the bushing 20 can be virtually press fitted into the leg, then bottom flange 56 spun over so as to secure the bushing both vertically and horizontally with respect to the base leg.

As threads 40 engage threads 42 bottom shoulder 38 is compressed vertically against corresponding shoulder 44, so as to secure the pen vertically within the bushing.

Manifestly various threading and shoulder configurations may be employed without departing from the claims.

I claim:

1. In a scriber of the type embodying a base leg supporting a drafting pen and a pivoted lever arm supporting a tracing pin,

(A) a drafting pen bushing vertically extensible through an aperture in said base leg and abutting top and bottom portions of said leg so as to support a drafting pen, said bushing further including:

(i) interior threads complementally engageable with exterior threads on the housing of said drafting pen;

(ii) an inner horizontal shoulder engageable with a corresponding shoulder on said drafting pen;

(iii) an outer shoulder engageable with a top portion of said base leg; and

(iv) a horizontal lower flange engageable with a. bottom portion of said base leg adjacent said aperture so as to lock said outer shoulder against said base leg.

2. In a scriber as in claim 1, said interior threads being disposed at the end of said bushing opposite said lower flange, so as to compress a drafting pen against said bushing as said drafting pen is threaded therein.

References Cited UNITED STATES PATENTS 1,848,283 3/1932 Wallace. 2,810,962 10/1957 Meyer et al. 33--31 3,002,280 10/ 1961 Bennett. 3,089,246 5/ 1963 Riepe. 3,192,629 7/ 1965 Morrison. 3,218,717 11/1965 Hansen. 3,292,262 12/ 1966 M011.

FOREIGN PATENTS 1,099,578 3/1955 France.

HARRY N. HAROIAN, Primary Examiner.

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