US1628974A

US1628974A - Lead pencil with external feed

Info

Publication number: US1628974A
Application number: US59313A
Authority: US
Inventors: Charles F Hartman
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-09-29
Filing date: 1925-09-29
Publication date: 1927-05-17
Anticipated expiration: 1944-05-17

Description

Ma 17 i927.

y c. F. HARTMAN LEAD PENCL WITH EXTERNAL FEED Filed Sept. 29. 1925 4 f /7 3 uw 3 l i af ,ML lli.. )f4/4 40%.! T., www@ T, www l LA A I Nif/SX TOR.

Patented Mayv 17, 1927.

g unirse CHARIFES lHARTMAN, OF LOS ANGELES, CALIFORNIA.

'LEAD PENCIL "WITH EXTERNAL ppncanonmea september 29,1925. .serian Naseem.

ating an external knob.v TheobjectS :in cQll-v porated 1n my improvement are :--'iirst', to

enable the use of writiilig leads of'oblong cross ,section :adapted .for `.the ycarpenter or other trades; seeonthto quicken the feeding action by simply ,pressinga =button third, to

save time in reiilling When a newilea-dof full length kis again inserted and fourth, @to provide a collar ror lead outlet terminal of filmore resistive material Which is not ls o easily narred by the use .of abra-sives` eln- 4plo-yedtoflteep the vlead pointasharp.

I attain these objects by the mechanism illustrated in the accompanying drawing, in lwhich: 'l j Figure 1 is a:vertical section of a pencil having an external feed, with a knnrled button on top Ywhich .can be pressed downto feed the leado-ut, and vfretained after partial rotation duringqthe time. a Vnew flead is being inserted;

Fig. 2 is an endfelemtion of F rig. 1;

I3 Lis la horizontal .section .taken through :the y.pencil-,oirthe line; `3-"13 of llg. 1. Y Fig el is a .horizontal .section taken through the :pencil ont-he line otFig. 1.

Fig .5 ds another embodiment of .any 2invent-iongshowinga pencil `with external feed and isa vertical section taken .on the *line 5--i5 of ,Fig 16 :showing .a button on .top to be pressed down When feeding-the lead out and to be ,kept .withdrawn duringfthe .time a new lead `:is inserted;

lilig. 6 isa vertical section taken on the line @6W5 of Fig. 5 5

` Fig. 'l' .is a Aperspective view Lof the -push button, :the .toothed rod and .the disengaging bar Fig.f8.is a perspective view of the leadleneasingshoe With the lead.

`Similarnumerals .refer .to analogous parts throughout the several Vfigures.

In Figs. 1, 2, 3 v,and'rl theouter housing or shell is made in two halves 1- and,2, and are united toward .the l upperend byscreivs 7, and the lower vend is .contained inthe round counter bore of the collaror .lead outlet terminal 8, which `has .a .longitudinal slot of oblong cross Asection .Wherefrom Vto protrude the vflat llead 19, 11-ld lierli,ly `fOr Writing or marking purposes.

"llfh-e .top portion K of :the l.flat lead 9, Vis fheld in place bythe fingers 1 0 (see also Fig. 8)', of the .metallic shoe `11, which hasa rough or slightly corrugated back side 12, andan elasticpawl Aterminal 13, integral therewith which .engages the 'round rod 14, .provided with Vdownwardly pointed ratchet teeth cut 'tangentially, to ,a .depth of a quarter part of A'the diameter. This ,toothed rod ,14, can bedepressed downwardly inthe slot 16 by knob 15, untilthebottom 17,.of thegap 18, is reached, theheightof this gap being equal tothe pitch of the teeth onthefrod .14.

.The slot L19, .has .anyoblong cross l section and is. divided between'the tvvo 4halves of the shell 1, and:2,. an d has r`a .rough or slightly corrugated `wall 20, Whichfserves .as il @back adjacent to therough surface ,12, ofthe shoe 1 1, `during fthe ,upward ,travel of .the .toothed rod 1 4, .during ,which .time shoe 11, v is stationary, .thus .allowing the elastic ,pavvl 13, tO- ride freelyon .thetopoffthe toothed rod lfflfasit ordinarilyis in the case ojfratchets.

The .upward ztravel ,of .the .rod 14, vand .knob 1.5, is actuated .by r.a .compression coil spring 21, thelower Wireend .O'f which isrcarrled in. the cess 22,-.of the shell l, and, lWhile the upper wire .end is fastened in the drilled hole 23, of the rod 14.

-ll-Vhen Ethe dat lead 9 is used up ,and a refill is inserted, .theshoe 11, Vs .forced l1p- Warduntil .the stop projection 24;, is reached. In order to do this .it is necessary to .disengage the elastic pavvl 1 3, from the teeth ofthe round :rod 14. This is provided for as shown in Figures 1 and 4, by simply twisting .the push button 15, and the toothed rod 114i, approximatelyQO degrees, this being aniple'rto .freethetoothed part of the rod 14, from engagement with vthelelastc .p aWl 13, thereby n bringing 4.the smooth ,part of said rod under it.

A limit to the angular movement of the pushbutton isprovided for by a stop pin 25 Twhich ,is'driven in the rod .14, and which can alternately touch ,thestop surfaces 26, and 27 of :the recess 28,.c ut into ,the shell halves 1, and 2 (see Figs. 1 and d), said stop .pin 25, touching Ithe 'top Wall v29-ot recess 28, also .limiting the axial upward travel. of .the ,rod 14.

The coil spring 2 1, is not only installed to elevate the .rod .14, but also 'to rotate :the same .into .engagement with the elastic pavvl 13. I

.The arrangementshown .in Figs. .5, 6,. .an d 7, showing another .embodimentof my nscribed and illustrated in Fig. l, but .when

inserting a rei'ill into the shoeY il, the release of the same and the disengaginp' ofv the elastic pawl. i3, Jfrom the teeth or the rod 1.4:, ori Vic-tes trom a pullenerted on the button l5. instead oi' a twist as previously described. Fig. T, indicates the push button l5, the neck 30, ot decreased diameter, continuing into the toot-hed rod 1^, which has an increased diameter, therebjv forming shoulder 3l, with the neck 30. 'ihc vertical slide bar 32, and supporting bracket 33.. containing hole 3a is rotationally mounted on the noch portion 30. The two wedge like and downwardly inclined wings 35, ot slide bar 32, are s lidably incased in pockets see Figs. and (i. having inclined top walls 3'5"., and are located in slieil halt l. The coii spring 2l, ed here :is purely a coinpression spring and keeps the slide i V...r 3Q, which is nearly touching the right end ot elastic pawl 13, down against thev shoulder 3l. As soon as a pull is enertedon button l5. the upward moving l,.o bar compelied torotate slightly around the iongin tudinal center ot rod lli, in a counter clockwise direction lookingirom the top, owing to the travel oi the angular and wedge shaped wir 85, on trie inclined surfaces 37. rihis ii'ioveinent tinally disengages the elastic pawl i3 :trom the teeth ot the rod lli, and the shoe llA is 'tree to travel upward until it tinally reaches the stop 24;, carrying a new inserted lead E), with it.

Another arrangen'ient in the structure though not illustrated here could .be obtained by rigidly' connecting the slide bar 32 and bifaclret 33, as shown in Fig. T, to the to-othed rod lli. :inthe latter case the wings 35 could be eliminated and a similar partial rotation (counter clockwise when viewed from the top) oi the button 15, will again disengage the elastic pawl i8, from the teeth ot the rod lli. rEhe slide bar 32 could have a variety ot different shapes of cross scction, and could even be made integral in one piece with the toothed rod 14.

l claim:

l. in a device o the class described, a shell consisting ot two halves, a longitudinal slot ot' oblong cross section adapted to lguide a marking eiement in said shell in conjunction with a longitudinal slot ot circular cross section adjacent thereto, a turnable rod having a ratchet Atace mounted in said round slot, a tip portion with a collar uniting atone end the two halves of the shell and providedl with an aperture aligned with said oblong slot through which to project said marking element, a shoe adapted to grip one end ot said marking element, said shoe havinga projecting pawl adapted to engage said ratchet tace of said rod, tot provide a feeding means tozpropel the marking element toward the point ot' the pencil. y

2. ln a device ofthe class described, comprising a shell consisting of two halves, a longitudinal slot. of oblong` cross section formed by the union of said Vhalves and adaptedv to guide aV marking element contained therein, in conjunction with a longitudinal slot of circular cross lsection Vadjacent thereto, a ratchet faced rod rotatably and reciprocably mounted insaid round slot; a tip portion with a collar uniting atV one end the two halves of the shell and pro-A vided with an aperture aligned with said oblong slot through which to project said marking element, *connecting means between said writing element and said ratchet faced rod whereby to advance said writing element toward-the point ot the pencil by reciprocation oi'` aforesaid ratchet faced rod and a means to limit the stroke of said reciprocation.

rihe substance contained in claim l and a means toV disengage said pawl with said ratchet. Y I i Li. The substance containedin claim l and a means to limit said feeding means in propeiling the marking element, through the aperture contained in the point o't the pencil.

5. The substance contained in claim l and means to limit the travell ot said rod in said round slot whereby to graduate said feeding mains which propels the marking element toward the pointot' the pencil.

6. In a carpenters tool, comprising a shell consisting of two halves forming interiorly when viewed in cross section a slot of substantially oblong cross section and a circular bore companionable therewith, said slot ot' oblong cross section adapted to guide a marking element mounted for movement therein, a reciprocable and turnable ratchet taced rod contained in said circular bore, a tip portion with a collar uniting at one end the two halves ot the shell and provided with an aperture aligned with said oblong siot through which to project said marking element; a shoe enclosing one end of saidV marking element and having a. detent which is adapted to engage said ratchet faced rod; means to reciprocate said rod whereby to propel said marking element toward the point ot the pencil and a means to limit the stroke of which said rod is reciprocated.

7. In a writing instrument comprising a shell composed ot two halves ycored so as to form when joined together two separate longitudinal communicating chambers, one of which has an oblong cross section, the other a circular cross section, said chamber ot' oblong cross section adapted to guide a writing member mounted for movement therein, and a ratchet faced rod rotatably and reciprocab'ly mounted in said chamber of circular cross section, a tip portion with al collar uniting at one Iend the two halves of the shell and provided with an aperture aligned with said oblong slot through which to project said writing member, means to limit the rotational movement and the reciproeable movement o'f said ratchet faced rod, and

'means to connect said writing member with said ratchet faced rod whereby to provide a feeding means to propel said writing meinber toward the point ot' the pencil.

8. In a writing and marking instrument comprising a tapered shell, consisting of two halves, a. tip portion with a collar uniting the tapered ends of the two halves forming said shell and provided with an aper ture, a longitudinal slot of oblong cross section formed by the union of said halves aligned with the aperture contained in said tip portion, said slot being adapted to guide a marking element in said shell in conjunction with a longitudinal slot or circular' cross section adjacent thereto, a. turnable rod having a. ratchet face mounted in said round slot, means to connect said marking element with said ratchet 'faced rod whereby to provide a feeding means to prop-el the markingelement toward the point olf the pencil, means to disengage said marking element with said ratchet faced rod whereby to insert a refill in said oblong slot and means to graduate the feeding means of the marking element.

9. In a Writing instrument of the class described comprising a shell body, one end of which is encased in a tip portion provided with an aperture composed of a hard burned porcelain substance, said shell body being made in two halves and united together, each said half being cored so as to form when united, two longitudinal companion chambers, each having an oblong and circular cross section respectively; the chamber having the oblong cross section being ada ted to guide a marking element centaine in said shell body and aligned-with said aperture, a toothed rod reciprocably and rotatably mounted in said chamber of circular cross section, a shoe adapted to grip one end of said marking element, lingers in said shoe for engageably holding said marking elementl therein, said shoe having formed as a part thereof a. detent which is adapted to engage the toothed portion of aforesaid toothed rod, a normally tensioned retractile spring fastened to said rod and recessed in said shell body whereby to produce a rotational means for re-engaging said toothed rod with said detent after partial rotation thereof and also to provide a reciproeable movement for said toothed rod whereby to propel said marking element toward the point of the pencil and a graduatory means for feeding said writing member in said direction.

CHARLES F. HARTMAN.