US1723146A - Pencil - Google Patents

Description

J. H. FiscHER Aug. 6, 1929.

PENCIL Filed Sept. 19, 1924 l INVENTOR BY /v- 5%@ MwfAmWM-mmy Patented 6, 1929.

UNTEYD STA'ifES PATENT GFFHCE.

JOHN H. FISCHER, OF NEW' YORK, N.

TO ENOEL COMFAY, OF

PENCIL.

Application filed September 19, E524.

rI'he invention subject of the present ap plication for Letters Patent is an improvement in pencils. The effect sought in the development of this device was the production of a mechanical pencil of this general character, in which by the simple turning of the cap at the rear end of the case the lead might be advanced or retracted or expelled from the case. In accomplishing this I have devised a propelling and retracting device which affords a spring sea for the lead, whereby the latter, in use, yields under any undue pressure and thus saves the lead from being broken. At the same time the spring seat or holder for the lead is so designed and combined with the propelling rod that the lead, if any, remaining in the seat may be at once expelled by forcing forward the propelling Vrod. and thereby compressing the spring against a flange in the tapered end ,of the case and thereby causing the rod to force out the lead.

In shop parlance, therefore, the new device is a propel, retract and expel pencil, and is distinguished by extreme simplicity and durability. I refer now to the accompanying drawing' in illustration of the improvement.

Fig. l is a central longitudinal part section of the complete pencil.

Fig. 2 is. a similar View on an enlarged scale, of the forward portion of the case.

F ig. 3 is a cross section on the line 3 3 of Fig. 2.

In many respects the construction of the pencil follows known and usual lines. It comprises a` case l, tapered at the forward end, containing a contracted guide cylinder 2 to which is secured a spiral wire 3. A cylinder l into the open rear end of the case and is closed by a rubber era-ser 5, to form a reservoir for the storage of extra leads. Beyond this reservoir the cylinder is extended in smaller diameter 6 to practically the end of the tapered portion of the case.

For a given distance the reduced portion 6 is longitudinally slotted and it contains a rod 7 with a bent end 8 that extends out through the slot 11. Over the forward or free end of the rod 7 is a spiral spring 9 secured to the said rod at l0 and extending down beyond the end of said rod to a short distance about the length of an ordinary lead towards the opening in the tapered end.

The end of this spring serves as the seat Serial No. 738,594.

and holder for a lead l?) which is inserted through the opening in the tapered end of the case and into the open end of the sprinol after the rod l() has been slightly retracted.

rhe cylinder d is. permanently secured in the case and is adapted to turn therein in the usual manner. Over its end lits a cap l2 of the usual character, which fits ti ghtly enough to turn the cylinder, and, in general, these parts of the pencil are not new and may be greatly modified if so desired. u

lthen a lead has been inserted throuo'h the tapered end into the open end of the spring 2, tne cylinder 4, the bent end S of the rot r engaging ene spiral wire l secured to the p rt 2, is turned,'whereuponthe rod 7 travels down through the portion of reduced diameter 6 andexposes more or less of the lead, or when the cylinder is turned in the opposite direction the lead is retracted into the case. If a slight space remain between the end of the rod 7 and the lead, the latter will be held in a spring seat which yields under pressure upon the end of the lead.

IV hen the lead is worn down the short stub remaining in the spring may be readily expelled by turning the capluntil the rod ll) forces the end of the spring 9 against a flange lll, whereupon the spring Yis compressed and the rod forces the lead out. I

This is an extremely simple and durable pencil which has many new and very useful features, the result of the constructions defined in the following' claims.

lVhat I claim is:

l. In a device of the character described. a helix, a tube within the he x provided with a longitudinal slot, a lead feeding red within the tube having a projection extending` out through the slot in the tube into engagement with the helix.r a helical spring surrounding the rod and attached at one end to th rod at some distance from the lead end of the rod, the spring projecting fard enough beyond said lead engaging end of the rod to clutch the lead, and connections whereby re" tive movements of the helix and slotted tube may be effected to actuate the rod and spring to retract and propel the lead.

2. In a device of the character described, a helix, a tube within the helix provided with a longitudinal slot, a lead feeding rod within the tube having a portion projecting through the slot in the tube into engagement with the helix, a helical spring within the tube attached at. one end to the rod at some distance from the lead engaging end of the rod and projecting far enough beyond said lead engaging end to clutch a lead, an abutment adjacent the Writing end ot the pencil against which said springma7 be compressed by final expelling movement of the propelling rod, and connections whereby relative movement of the helix and slotted tube may be elifected to actuate the rod and spring to retract, propel and Vexpel the lead.

3. In a mechanical pencil the combination of a barrel and a tip, a coiled spi-ing adapted togrip a lead by means of its coils, mea-ns for moving` the spring longitudinally ot the barrel to toed the lead, means for arresting` the endfof the spring and an ejector movable relatively to the spring for ejecting the lead from the spring and through the tip.

4l. In a mechanical pencil the combination of a barrel havinga tip, an ej ector rod h aving a coiled flexible member concentricalljyT surrounding it and projecting beyond the end thereof, and having an open end adapted to Areceive and grip a lead, means for moving the rod and flexible member longitudinally of the barrel to feed the lead and means for automatically arresting); movement of the tleX- ible member during the end of the feeding movement to carse the ejection of the lead therefrom.

5. ln a mechanical pencil the combination of a barrel having' a tip, a hollow, longitudinally compressible member in said barrel and adapted to receive and grip a lead in its open end and means for moving the member longitudinally of the barrel to ieed the lead through the tip and means for arresting forward movement or the compressible member curing its compression for permitting release ot the lead..

6. ln a mechanical pencil the combination of a barrel having a tip, and a hollow lead carrier movable longitudinally of' the barrel, said carrier having a coiled open end adapted to receive and Orip a lead, means to cause the longitudinal compression of said coiled end and means to prevent lateral movement-otl the coils during their compression.

7. ln a mechanical pencil the combination of a barrel having a tip and a lead carrier comprising a coil adapted to grip a lead in its open end, and means for causing the direct longitudinal compression of the coilior causing the end of the coil to release its grip on the lead. A

ln testimony whereof l hereto aiix my signature. Y

JOHN H. FISCHER.

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