US2302122A

US2302122A - Mechanical pencil

Info

Publication number: US2302122A
Application number: US353324A
Authority: US
Inventors: Paul S Hauton
Original assignee: SCRIPTO Manufacturing Co
Current assignee: SCRIPTO Manufacturing Co
Priority date: 1939-03-03
Filing date: 1940-08-20
Publication date: 1942-11-17
Anticipated expiration: 1959-11-17

Description

Nav. 17, 1942.

P. S. HAUTON MECHANICAL, PENCIL Original 4Filed March 5. 1959 2 Sheets-Sheet l I f iw u.\ fw

Nov. 17, 1942. P, s. HAUTQN MECHANICAL PENCIL Original Filed March 3, 1939 2 Sheets-Sheet 2 PAUL J. #Auro/'v 'MM 5' [AJR Patented ov. 17, 1942 MECHANICAL PENCIL Paul S. Hauton, Atlanta, Ga., assignorto JScripto Manufacturing Compan poration .of Georgia.

\ originan applicationiMarch 1e, 1939,*Seria1fNo.

259,535. Divided and this'application'August 20,1940,serial-Normaal v aclaims. 01. 1204-5178) ,grooves-are utilized for guiding parts of the feed mechanism. According rto the .present uinvention one .of the barrel grooves is utilized for the reception of lugs l.which extend through the pencil barrel from the basef of the pocketclip, saidA lugs being easily, in the assembly, clenchedover inside the groove to Vthus secure `the pocket clip .to the kbarrel and so that Vthe hollow pencil barrel may .beeiliciently` utilized for the drive mechanism Without interference from .theclip mounting. g

Thelspecic pencil mechanism herein disclosed peculiarly lends itself to a simpliedand efficient clip arrangement with the barrel and drive` i mechanism, 4which .may be, generally stated, as mounting .upon a pencil barrel. of the base of-ra pocket vclip in such manner that cooperation'may be had with van exterior,v drive part, rotatably mounted upon the barrel and affording a rigid support for the clip, Without interference with the internal drive mechanismwhile preservingr an uninterrupted, even, outer surface throughout the .length of thepencil barrel.

More specifically stated .the embodiment of the invention herein illustrativelyselected `and described comprises a pencil barrel the en'd of which, `opposite the Writing end, is circumferen- .tially reduced, the reduced end is segmentally recessed to accommodate the base of the pocket clip, and .an external, manually operable drive vferrule is positioned at the end of the pencil barrel, occupying the reduced portion thereof and overlying and-therefore concealing the base of the pocket clip which occupies the segmental recess.

From the base of the pocket clip so located in the said segmental recess, there projects through to the interior of the pencil barrel a plurality of lugs or prongs, which, as above stated, are clenched over in an internal longitudinal groove whereby to securely hold the pocket clip in engagement with the pencil barrel Without interference with the rotatable pencil helix which may be supported by the axial base of the pencil barrel.

"Other objectsjand 'advantages ,of the invention will becomeapparentlas'the description proceeds. While one yembodiment vof this invention is illustratedin the accompanying drawings, it is to be understood 'that such embodiment merely serves` asfan illustration of the `underlying prin- Aciples oi the' invention so Vthat it maybe readily comprehended by'those skilled in the art, and is .not intended as limiting the `invention Ito the specicdetailsdisclosed therein.

In said drawings: Fig. 1 is'aifrontelevation, partly in'section, of

`an assembledl penciLWithout the ferrule and-clip.

`Fig..2 is 'a verticaljsection ,of the upper part of a fully assembled penciltaken on liner-*2 of Fig. 6.

Fig. 3 is a'vertical'section'of the Writing end of the pencil, taken lon line "3-'3, of Fig. '6,.with the lead movingmechanism shown in elevation.

Fig. 4 is anenlargement of the View of Fig. 3.

Fig..5 is a section `on line 5 -5 ,of Fig. `2.

Fig.' 6 is a section on line l--f of Fig. 2.

Fig. 7 isa section on linel-j'l of Fig. V2.

Fig., 8 -is avertical section through the writing end, showing the llead ,moving mechanism in .elevation at the end, of the lead ejecting stroke.

lFig. 9 is a similar partly section viemtaken at right angles to Fig."8.

Figs. 10and lluare, respectivelyL a top plan andvertical sectionalview `of one form oi a helix driving ,.cap. i

Figs. `12` and u13 are, respectively, elevations,` at

Vright angles to oneanother, of one form of a lead `vejector pin, .and

Figs. 14 and 15 Iare elevationsV at right4 angles to .one anothenof one form of `a leadgrip sleeve.

`Continuing now by Way of a moredetailed description, one 4part of ,thelead moving mechanism comprises a helix A preferably consisting of coiled -metalfstrip anda leadgrip `sleeve `B relatively movable Ato i the helix, Y the sleeve B vrhaving a laterallyextendingflug B projecting throughand beyond the coil spacing or threadtrack between Y .the adjacent'turnsfofvthe helix. "The lug 1B' engages a slot or guide channel C' preferably formed in the casing D and extending below the end of the helix at the writing end of the pencil, so that the sleeve B is constrained to move in a longitudinal direction, within the casing. The guide slot is preferably disposed parallel to the axis of the casing as shown in its preferred form. Lug B is disengaged from the helix A at the end of the lead ejecting stroke, its further movement being stopped by engagement with the casing lead grip sleeve and comprises a pin E slidable in the lead grip sleeve B. Pin E has a yoke F projecting laterally between the turns of the helix A, and a dependent lug or leg F', exterior to theV helix A, engaging a longitudinal slot or channel G formed in the casing and constraining the lug F to move in a longitudinal direction when actuated by the helix A. The" guide slot G terminates at a point immediately above the Vlower end of the helix, so that the ejecting pin E remains permanently engaged by the helix and continues tomove longitudinally within Vthe sleeveBl after the latter'isv disengaged from the helix to completely eject the lead from the sleeve. Pin E has also a notch E which is used to stop the movement of Ein sleeve B.

Sleeve B has inwardly projecting lips I-I which engage with shoulder H of the notch E on ejector pin E. The location of shoulder I-l gives the correct 'spacing of clutch lug B in relation to lug F of ejector pin E for engagement withhelix A on the backward travelof pin E from the foremost or ejecting position of pin E and clutch B. To prevent lug B from entering helix A too soon the endv B2 of clutch B strikes lugF of pin E and spaces B' and F farther apart than4 the pitch of the helix A, thus preventing entrance of B' on the first complete turn of the helix A.

The casing D is, in its preferred construction, molded to the form shown,` and at its writing end has a lead gude'tip J having an exposed tapered portion J and a reducedcylindrcal end K, tted in the writing end of the casing, and keyed thereto by the .annular flange K.

The upper end of the casing is formed into cylindrical head M which isV further reduced in diameter to form cylindrical head N. Annular groove O is located' between M and N and serves as means for holding connecting caprP in engagement with casing D.

The connecting cap P is comprised of a circular disk 'P' and downwardly projecting fingers Q and Z. Disk P is provided with an opening R concentricv with the helix receiving opening D inthe casing D and has a lug Rf projecting into opening R. Lug R' ts snugly into slot A cut near the driving end of helix A. The ends of lingers Q and Zrare bent into projections Q and Z which lit into groove O. Fingers Z spring inwardly to frictionally engage cylindrical head N. This friction prevents helix A from turning and retracting the lead into the casing under heavy writing pressure. Projections Q' also will engage the upper shoulder of groove O as soon as pressure is applied to the writing end of the lead. This is an additional safeguard against the lead being pushed into the casing accidentally. Fingers Q spring outwardly to frctionally engage with driving ferrule W. To prevent cap P from disengaging from head N when ferrule W is removed, projections Z engage with the upper shoulder of groove O. To prevent up and down movement of connecting cap P on head N when the ferrule W is pushed over fingers Q, the projections Q press against the upper shoulder of groove O and pull disk portion P' of cap P against the upper end of head N, thereby stopping all up and down movement of helix A in casing D.

The reduced barrel portion M is provided with Van arcuate peripheral recess or seat S to receive the base of a pocket clip T so that its surface is flush with the Vsurface of the reduced portion M.

The clip is formed with a pair of longitudinally spaced lugs T', which are received in openings V in the casing Wall, and pressed downwardly into the slot V formed in the'casing, totherebyref tain the clip firmly and, rigidly on the casing Y In order to provide a manual drivefor'the feed mechanism, a manually operableferrule W is fitted over the reduced portion Mjof the casing and thru fingers VQ frictionally. engages the helix connecting capv P to' rotate the capand its associated helix A; Y The ferrule W is open at both ends, one end abutting against the shoulder L'on casing D, and theA other end extending above -the cap P to form` ay housing for an eraser cup X. An annular indent W', forming anpinwardly projecting annular rib, is provided onrthe ferrule extension to` stopV Yandseat thev eraserv cup X thereon..-'.

rAlthough the invention has been describedin its preferred embodiment, modifications will suggest themselves to thosev skilled in the art, and

it is my intention to cover all such modifications as lcome'within the scope of the appendedclaims.

Itis claimed: l Y Y f 1. The combination of a. hollow pencil barrel having Van external recess a ferrule rotatively mounted on the end of the ybarrel with a pocket clip having a supporting base seated inthe external recess of the `barrel and having its vsurface flush with the surface of the `barrelandcon- ,cealed by the rotatable flerrule and spaced prongs extending from the supporting baseto the interior of thebarrel. j j

' 2. The combination of .a hollow pencil jbarrel havingan external recess and an internal groove with a pocket clip having a supporting base seated in said barrel recess and having'spacedv prongs on the supporting base clenched within the bar- 'rel groove, the width ofthe prongs being'substantially the width of, the groove. Y .V Y

3. The combination o fa hollow p encil'barrel having an external recess and an internal groove with a pocket clip `having a-supporting base seat'- ed in said barrelfrecess andrhaving spaced prongs on the supporting base Y clenched Within the groove. p- 7 PAUL s.VHAU'-rQN-.