US1406056A - Pencil - Google Patents

Description

AY MICHAEL.

PENCIL.

'APPLlc/Ton min Anf ze. 192|.

Suva/nto; W W24/M Patented Feb. 7, 1922.

a@ @Home i r wf; 12W. @www UNITED STATES PATENT OFFICE- ALFRED MICHAEL. or NEW YORK, N. Y.. ASSIGNOR To EAGLE PENCIL lCOMPANY, or

NEWYoRK, N. Y.

PENCIL.

Specification of Letters Yatent.

Application filed March 2e. 1921. serial No. 455.735.

To al? whom 'it may concern Be it known that I. ALFRED Micnxni.. a citizen of the United States, residing at. New York, in the county andlhtate of New York, have invented certain new and useful Improvements in lencis, of which the following is a full, clear, and exact description.

The invention which forms the subject of this application for Letters latent is an improvement in pencils of the mechanical type in "the making of which the object has been primarily to reduce the weight of the pencil as a whole, to simplify the construction of its constituent parts and to produce a mechanical combination which is more certain in its operation and more durable than similar devices which have heretofore been in use. In general, the construction and its inode of operation follow known lines, but its distinctly Vnovel features are in the design of its elen'ients or working parts, and these may be most readily understood from the detailed description in connection with the drawing which follows In the annexed drawing,

Fig. 1 is a View in elevation of the complete pencil.

Fi 2 is a sectional view of the case exhibitlng the .interior parts or mechanism in elevation.

Fig. 3 is a. central vertical section of the broader aspects'is concerned this sleeve may ybe of other material such as metal and secured against rotation in other ways.

Assuming the.. material to be of wood, .it

has a recess at its upper or rear end into which the straight shank of a clip 3 is forced through a. small transverse slot 4 in thel case and by this means the clip is held firmly in position and a most economical. and satisfactory means secured for fastenmg the clip in permanent operative relation in the. case.

The sleeve 2 contains a slot 5 of proper length to meet the conditions of use, and a short metal cylinder' or sleeve 6 to which is attached the end of a splral wire 7 is passed `into the upper end of the case. thc` spiral wire extending down through the bore of the sleeve. ll'ithin the spiral wire is a follower wire. 8 having a projection or bent portion l) that is engaged b v the convolutions of the wire and which enters the slot 5. The sleeve 2 carries at its forward or lower end a bushing 13, which is threaded at its free end 16. The sleeve 2, the bushing 13.7the carrier 6, the spiral wire T. and the follower wire 6, are assembled first and then forced into the case, the sleeve being held in place by the bushing, after which the end edgeI of the case is turned down into :i circular groove l() in the larrier 6 by which means the said carrier and its attached parts are permanently secured to the case but are capable of being readily rotated therein.

A piece of india rubber ll is forced into the open end of the sleeve or carrier 6 and a Cap 12 is forced down over the same and the carrier until its beaded edge tits down over the end edge of the case 1, as shown. The frictional engagementbetween the cap 12 and the sleeve 6 permits the latter to be rotated by the rotary movement of the cap with the result that by turning the cap the follower wire 8 may bel advanced or retracted by the engagement of the projection 9 with the spiral wire.

Wit-h the bushing 13 internally threaded at its forward or free end, it engages an annular externally threaded cylindrical lead reservoir or magazine 14, the forward end of which is shouldered or stepped as shown at l-l in Fig. 2, lassinge'ntirely through this magazine 14 isa tube 15 which fits snugly the forward contracted end of the same and is itself then tapered and extends down throughthe tapered end of an extension 16 of the case 1. its end edges being flush with those of said extension.

This extension is fitted tightly over the maga/line 14 and is practically inseparable therefrom. As is usual in pencils of this character the leads pass through the guide formed at the Vpencil tip, which as shown at 1T isslotted for a small fraction of an 'inch from the tip and then compressed to form a slightly yielding frictional guide. The tube Patented Feb. 7, 1922.y

The upper or rear end of the magazine 14 is internally threaded to receiveacaplS llaving a central perforation through its top with downwardly extending and linwardly inclined edges forming a conical guide 19. The upper or rear end of the tube 15 is fiared as shown" at 20, in Fig. 6, and lwhen tliejcap 18 is screwed inplace this flaring end engages the conical guide 19 andl the tubel is aligned exactly in the center oifthe case. The con `ave upper surface of the cap also permits the follower wire 8 to enter the tube 15 even though ythe wire and ltube are not primarily in alignment.

lIhe parts thus constructed and assembled form Van annular magazine in which extra leads Q1 may be kept. To place a' lead in the pencill the pointed extension.. vis turned to unscrew the lead niajgazineH The cap 1S is removed lto gain access to the magazine and beingv replaced a lead is simply dropped through. the central fperi'oratiou down through the ltube 15. The 'follower 8 is`V retracted and the magazine screwed-home.` By then turning the cap 12 the lead is forced straight through the contracted portion of tube 15 and the open pencilv tip of the pointed extension 16.

In this device vall parts are readily and cheaply made. No unusual means are required for the permanent assembly of the parts.y The latter are held in their correct positions of alignment and the pencil, as a whole, is capable of indefinite use, Without clogging of the tip or any derangement ot' the parts.

with which the end of the tube engages and by which it is centrally aligned.

Q. In a mechanical pencil- 'the combination with a case andmeans carried thereby Jfor advancing or retracting a follower .wire Jfor the leads oi' a detachable pointedextension for.` the case, an annularv lead magazine secured to said extension and provided with, internal and external threads at its end, the external threads adapted to engage with the case, a perforated cap adapted to engage with lthe internal threads of 'themagazine,

said cap having downwardly extending and fl i to the perforation inwardly inclined. edges forming a conical guide, a tube eXt-end'mg through the magazine and to the pointed 'end of the extension and ha-vinga tiaring upper end adapted to engage with the conical guide on the cap and to bek centrally aligned thereby when the parts are assembled.

In testimony whereof I hereto alix my signature. f

ALFRED MICHAEL.

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