US726767A - Lead-pencil. - Google Patents

Description

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PATENTBD APB.. ze, 190s. o. R. VON SGHBMNITZKY.

LEAD PENCIL.

APPLIoATIoN FILED AUG. zo. 1902.

N0 MODEL.

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Ml VEN UNrTnD STATES ATENT FFICE.

CARLRITTER VON SCHEMNITZKY, OF VIENNA, AUSTRIA-HUNGARY.

LEAD-PENCIL.

SPECIFICATION forming part of Letters Patent No. 726,767, dated April 28,V 1903.

Application tiled August 20. 1902. Serial No. 120.388. (No model.)

To a/ZZ whom it may concern:

Be it known that I, CARL RITTER voN SCHEMNITZKY, a subject ot' the Emperor of Austria-Hungary, residing at Vienna, Austria-Hungary, have invented certain new and useful Improvements in Lead Pencils, of which the following is a specification.

The present invention has reference to improvements in lead-pencils, and relates more especially to lead-pencils with advanceable graphite core; and the object of the invention is to provide means whereby the graphite or colored core can be successively advanced out of the casing and is automatically clamped in the desired position so as not to slide back again upon use.

In order to make the invention more readily understood, I willpnow describe it with reference to the accompanying drawings, of which- Figure l is a side view of the advancing wire detached. Fig. 2 is a side View of the improved lead-pencil. Fig. 2a is a cross-section through Fig. 2. Fig. 3 is a longitudinal sectional elevation. Fig. 3 is a cross-section through Fig. 3. Fig. 4 is a longitudinal sectional elevation showing .the operation in ad-V vancing the lead core. Fig. 'is a longitu-A dinal sectional elevation of a slightly-modi-v iied form of construction, and Fig. 5n shows the lower end of Fig. -5 in side elevation.

The present invention does away with the various disadvantages of the lead -pencils with advanceable core now in` use.

In my construction I provide a groove o. parallel to and communicating overits entire length with the core-bore e and extending not quite to the pointed end of the casing, as at b in Fig. 3, or extendingclear through to the point, as shown in Fig. l5. Into this groove or channel a, isintroduced the wire c, bent as shown in Fig. 1, of elastic material. This wire is providedat` the one end with a' little ring or eyeg of a diameter corresponding to the diameter ot' the core-bore, and at the otherend with an enlargement or head c. Just below this enlargement c the wire c is angularly bent, as at c2. It' the groove a does not extend to the point of. the casing, a side slot d is provided for the passage of the wire. After the latteris introduced, as shown in Fig. 3, the lead or like core f is likewise introduced into the casing-bore until its blunt hind end bears against the wire ring g, as shown in Fig. 3. The elasticity of the wire presses the core against the casing-wall. For advancing the core, the wire is pulled out the desired length by pulling on the enlarge ment c', whereby the core is pulled out a corL responding distance,as shown in Fig. 4. The wire is then pushed back again, and by reason of its elasticity bulges inwardly behind the core end, as shown in Fig. 5, preventing the lead core fromV receding upon use. By

pulling out the wire and then pushing it and the core back together, the latter may be madeto disappear wholly, thereby prevent= ing it from getting broken oft during hand;l

ling of the pencil.

What I claim,-and desire to secure by Letters Patent, is

In a lead-pencil, the combination of the cas ing having a longitudinal central bore and a -groove in saidcasing, a core adapted to slide within the said casing-bore, an elastic, bent and curved wire, adapted to rest and slide within said groove, running parallel to and communicating over. its entire length with the said central bore, a ring at one end of thesaid wire andan enlargement at the other end, the parts being constructed and coperating, substantially as and for the purpose set forth. i

In testimony that I 'claim the foregoing as my invention I have signed my name inpresence of two subscribing witnesses." j

CARL RITTER. VON SCHEMNITZKL Witnesses:

MAX HAUssER,

ALvEsTo S. HOGUE.

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