US2186870A - Mechanical pencil - Google Patents

Description

Jan. 9, 1940. D. KAHN MECHANICAL PENCIL 'Filed Sept. 24, 19.38

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, thatit is immovable relative thereto.

Patented Jan. 9, 1940 .UNITED sTA'li-:sy

PATENT OFFICE- MECHANICAL PENCIL David Kahn, North Bergen, N. J., assgnor to David Kahn, Inc., North Bergen, N. J.,a corporation of New Jersey Application September 24, 1938, Serial No. 231,584

21 claims. (erizo-1s) within the' barrel are necessarily made of very.v

thin material and, for the purposes of commercial production, it is common to make such parts 1,5 as the yrunner tubesof thin vstamped sheet metal,y

rolled orlotherwise formed into a tube. Within such runner tubes is a member known as a lead carrier and externally of the runner tube there is provided a spiral tube, that is to say a tube having a spiral slot therein. The lead carrier has a lug which engagesin the slot of the spiral tube which isfcommonly known as the actuating tube.

The l, lead carrier being within ,the rubber tube and the actuating tube being without the runner 25 tube,V it is essential that a slot be provided through which the lug o f the lead carrier may project. Furthermore, this slot in the runner tube serves to hold the lead carrier from rotation and to lholdits lug so that relative rotation of the runner tube and the actuating tube will effect longitudinal movement of the lead carrier.

, It isy an important object of the present invention to provide means on the runner tube forv engaginginto the material of the barrel to prevent vrotation of the runner tube relative to the barrel. In the preferredj formof the invention, the means on vthe runner tube areprovided with a plurality of pointed members. Illustratively, the runner tube may have thereon o or associatedv therewith a flange member of polygonal form with its sides concaved to form cus'ps-vat its angles.

. one form of the invention, the runner tube,`

which is provided with a longitudinal slot, has

therein a lead carrier provided with a lug pro jecting through the runner tube slot. There is also provided means on the runner tube for engaging into the material of the barrel toprevent rotation of the runner tube relative to the barrel, said meansbeing provided with seating means in Valignment with the slot of the runner tube to receive and seat the runner tube. j The means onthe runner tube for engagin into the-material of the barrel may be mounted slidably on thel runner tube and illustratively,

rof the pencil.

`of the tip of the pencil showing a still further said means ymay be provided with a projection member projecting inwardly into therunner tube slot.

In the more specific form of the invention, the

ybarrel member of the pencil is provided with a FK tip at its lower end and a sleeve member engages the tip. There is formed on the sleeve member a bearing washer of polygonal shape of a character hereinbefore set forth. The bearing washer is preferably, non-rotatably mounted at the up- 'lo per end of the barrel tip. A rotatable anda movable actuating tube is mounted in the pencil barrel and has its lower end engaging in the washer while the runner tube is immovably tted into the barrel tip, the runner tube being pro- -15 vided with a lead carrier having a lug projecting through the slot ofthe runner tube and engaged by the actuating tube of the pencil. The bearing washer is, preferably, provided witha radial grooveand an inward projection in alignment 20 therewith. The lug of the lead carriertube is 4 adapted to seat in the radial groove and the projection member engages in the runner tube slot.

AOther objects and advantages of the present invention will appear from the following detailed 425 disclosure. y .y

Broadly stated, the invention consists in the vnovel structure and combination of parts illustrated in the'accompanying drawing and specifically claimed. 30 y .Figure 1 is a side view of a pencil Partly inl section showing the hexagonal Washer according to the present invention. l

Figure 2 is a section on the'line 2- -2 of Figure 1. v

'Figure 3 is a section similar to Figure 1, but showing a further modification of the tip portion Figure 4 is a vertical section of the lower part l modification. o

vliigure 5 is asection-on the line 5-5 of Figure 4. Figure 6 is a sectionsimilar to Figure 4 but illustrating another modification. l 45 Referring to Figure' 1 of the drawing, a pencil having the usual barrel-which may be of any7 suitable material is indicated in general at I0.

Located within the barrel Il of the pencil is an actuating spiraly l2 which is rotatably mounted 50 about a runner tube I3. Located within the runner tube I3 is a suitable lead carrier not shown inv detail as the construction thereof is immaterial to' the present invention. However,

a lug on the leadcarrierengages within the slot 55 I4 of the spiral I2. This lug is designated in Figure l by the reference numeral I5. Located within the lead carrier is a lead ejector having a lug I6 projecting laterally therefrom and passing through the slot in the runner tube and also engaging in the slot I4. The lead carrier and the ejector function in a manner well known in the art.

In the form of the invention disclosed in Figure l, the runner tube I3 is frictionally tted at its lower end in the tip of the pencil I 1. 'I'here is also provided means for supporting the lower ends of leads L which in this type of pencil are carried in a magazine located between the actuating mechanism and the barrel. This means for supporting the leads is a washer It which is wedged in the barrel at the beginning of the taper thereof.

In the pencil construction in accordance with the invention, there is also provided a second washer IS which may be of substantially hexagonal form,` having spurs or teeth 20 which engage into the material of the barrel II to prevent rotation thereof. This hexagonal washer is slidably and non-rotatably mounted on the runner tube I3 and serves to retain the runner tube immovable within the barrel.

In the modication disclosed in Figure 1, as particularly shown in Figure 2, the hexagonal washer I9 is provided with one or more depressed portions 2! and a lug 22 extending from a depressed portion which ts into the slot of the runner tube, thus serving to hold the runner tube against rotation within the barrel.

In the modification disclosed in Figure 3, the runner tube, instead of being frictiona'ly tted into the tip I'I, is provided with external threads 23 which cooperate with a suitable threaded portion in the tip II.

In the modication disclosed in Figures 4 and 5, the tip II may be provided at its upper end with a bore having a lower threaded portion 24, and a sleeve 25 may be screwed therein having an internally tapered socket 26 for the reception of the lower end of the runner tube I3. The upper end of the sleeve 25 has formed thereon a hexagonal washer or flange 2'I provided with a groove 28 in alignment with the runner tube and adapted to seat the lead carrier lug I5.

In the modification disclosed in Figure 6, the upper end of the tip II is provided with a reduced and externally threaded extension 29 on which is screwed a sleeve 3|) having its upper end formed as a hexagonal washer or head 3I. rIhe head 3l is provided with a groeve 32 which is in alignment with the slot of the runner tube and also serves to seat the lead carrier lug as hereinbelcre described in connection with the other mod'cations. It is understood that a similar oppositely disposed groove may also be provided.

In assembling the device as is clearly understood, the hexagonal washer being slidable longitudinally of the barrel may be positioned therein by sliding the washer down the barrel. It is also understood that the tip I'I may be attached to the barrel in any desired manner. For example, it may be engaged in the barrel by means of a reduced portion as shown in Figure l. As shown in Figure 3 the tip may be screwed on the lower end of the runner tube, the latter be ing held against rotation by the hexagonal washer I 9 as hereinbefore described. Furthermore, in such construction, the actuating tube or spiral has its lower end supported on the washer. In

constructions of the aforementioned type, it may be noted that the tip is not threaded to the Celluloid or other plastic material forming the barrel. This saves considerable losses resulting from stripping of the threads as the hexagonal washer i9 is depended on to hold the assembled pencil mechanism to the barrel.

This application is a continuation, in part, of my co-pending application Serial Number 733,- 524, filed July 2, 1934, for Mechanical pencil.

What is claimed is:

1. In a mechanical pencil, a barrel having a tip carried by the lower end of the barrel, a bearing washer at the upper end of said tip, a rotatable actuating tube mounted in said barrel to have its lower end engage on said washer, said washer being of polygonal form and having its angles engaging the material of the barrel to prevent rotation of said washer.

2. In a mechanical pencil, a barrel having a tip at the lower end of the barrel, a bearing washer at the upper end of said tip, a rotatable actuating tube mounted in said barrel to have its lower end engage on said washer, said Washer being of polygonal form with its sides concave to form cusps at its angles, said cusps engaging the material of the barrel to prevent rotation of the washer therein.

3. in a mechanical pencil, a barrel having a. tip carried by 'the lower end of the barrel, a bearing washer non-rotatably mounted at the upper end of said tip, a rotatable actuating tube mounted in said barrel to have its lower end engage on said washer, said washer having a profe tion on its under side and the tip having a corresponding recess wherein the projection ts to prevent rotation of the washer.

In a mechanical pencil, a barrel having a. tip carried by the lower end of the barrel, a

bearing washer non-rotatably mounted at the upper end of said tip, a rotatable and immovable actuating tube mounted in said barrel t0 have its lower end engage on said washer, a runner tube immovably tted in said tip and having a iongitudinal slot therein, a lead'carrier in said runner tube and having a lug projecting through said slot and engaged by the actuating tube, said washerl having in its upper face a radial groove and an inward projection aligned therewith, the lug of the lead carrier being adapted to seat in the radial groove and the washer projection engaging in the runner tube slot.

5. In a mechanical pencil, a barrel, a tip at the lower end of the barrel, a bearing washer mounted at the upper end of said tip, the Washer being oi polygonal form and having its angles engaging the material of the barrel to prevent rotation of the washer relative to the barrel, a rotatable actuating tube mounted in said barrel to have its lower end engage the washer, a runner tube immovably tted in said tip and having longitudinal slot therein, a lead carrier in said runner tube having a lug projecting through said slot, said washer being provided With a depressed rib portion having aligned therewith a projection member engaging the slot of the runner tube, said lead carrier lug being adapted to seat in said depressed rib portion.

In a mechanical pencil, a barrel, a tip at the lower end of the barrel, a bearing washer mounted at the upper end of the tip, said bearing washer being of polygonal forni and having its angles engaging the material of the barrel to prevent rctation of the bearing washer relativato the barrel, and a sleeveon said bearing washer engaging the tip. l

'7. In a mechanical pencil,v a barrel, a tip at the lower end of the barrel, a bearing washer mounted at the upper end of the tip,` said bearing washer being of polygonal form and having its angles engaging the material of the barrel to prevent rotation of the bearing washer relative to the barrel, said tip having' a threaded 'bore in its upper part and a sleeve onsaid washer externally threaded and screwed into said bore.

8. In a mechanical pencil, a barrel, a tip at the lower end of the barrel, a runner tube immovably fitted in said tip and having a longitudinal slot therein, a lead carrier in said runner tube having a lug projecting through said slot,a bearing member of polygonal form and having its angles' engaging the material Iof the barrel to prevent rotation of the bearing member relative to the barrel, said bearingmember having a slot therein in alignment with the slot of the runner tube to seat the lead carrier lug.

9. In a mechanical pencil, a barrel, a tip at the lower end of the barrel, a sleeve member .engaging the tip member, said sleeve having formed thereona bearing washer ci polygonal form and having its angles engaging the material of the barrel to prevent rotation of the sleeve and l washer relative to the barrel. fr v 10. In a mechanical pencil, a barrel, a tipat the lower'end of the barrel, a runner tube immovably fitted in said tip and having a longitudinal slot therein, a lead carrier in said tube having a lug projecting through said slot',v a sleeve member engaging the tip, said sleeve having formed thereon a bearing washer of ypolygonal form and having its angles engaging the`mate l rial of the barrel to prevent rotation of the sleeve and washer relative to the barrel, said washer having a slot therein in alignmentwith the slot of the runner tube to seat' the lead carrier lug.

l1. In a mechanical pencil, a barrel, -a tip at the lower end of the barrel, a sleeve member engaging the tip, said sleeve having formed thereon a bearing washer of polygonal shape with its -sides concaved to rform' cusps' at its angles, said cusps engaging the material of the barrel to prevent rotation oi the sleeve and washer relative to the barrel.

12. In a mechanical pencil, a barrel, al tip at the lower end of the barrel, a runner tube irnmovably fitted in said tip and having` a' longitudinal slot therein, a-lead carrier in said runner tube having a lug projecting through said slot,

a bearing member having a plurality of pointed members forengaging into the material of the barrel to prevent rotation of the bearing member relative to the barrel, said bearing member hav ing seating means -thereonin alignment with the slot of the runner tube to seat the lead carrier 13. In a mechanical pencil, a barrel, a tip at the lower end of the barrel, a runner tube tted in said tip having a longitudinal slot therein, a lead carrier in said runner tube having a lug pro jecting through said slot, a bearing member slidably and non-rotatably mounted on the runner tube and having a plurality of pointed members for engaging into the material of the barrel to prevenft rotation of the bearing member and 14. In a' mechanical pencil, a barrel, a tip member at the lower end of the barrel, means for feeding lead through the tip' member including a runner tube, `and `meansfon the runner tube provided with a plurality of pointed members for engaging into the material ofthe barrel to prevent rotation of the runner tube relative to the barrel. v

15. In a mechanical pencil,l a barrel, a tip member at the lower end of 'the barrel, means for feeding lead through the tip member includ'- v ving a runner tube, and means slidably mounted n on the runner tube provided with a plurality of pointed members for eng-aging into the material of the barrel to 4prevent rotation of the runner tube relative to the barrel said runner tube and last-mentioned means being relatively 'non-rotatable. y

16. In a mechanical pencil, a barrel, a tip mem lber at the lower end of the barrel, means for feeding lead through the tip memberincluding a runer ltube having a longitudinal slot therein, a lead carrier in said runner tube having a lug projecting through said slot, means on the runner tube for engaging into the material of the barrel to prevent rotation of the runner tube relative to the barrel, said meansbeing provided vwith seating means in alignment with the slot relativeto the barrel, said means being providedv with seating means in alignment with the slot of' the runnertube to receive and seat the lead carrier lug.

18. In a mechanical penciha barrel, a tip member at the lower end oi the barrel, means for feeding lead through the tip member including a runnertube having a longitudinal slot therein,

a lead carrier insaid runner' tube having a lug projecting through said slot, means on the runner tube :for engaging into the material of the barrel to` prevent rotation of the runner tube rel- V ative to the barrel, said' means beingprovided 'with a projection member projecting into the runner tube slot and with seating means in align ment with the'slot of the runner tube to receive and seat the lead carrier lug.

i9. In a mechanical pencil, a barrel, a tip car ried by the lower end of the barrel, a bearing l washer at the upper end of said tip, a rotatable actuating tube mounted in said barrel to have its lower end engage on said washer, said washer having a projection on its underside and the tip having a corresponding recess wherein, the pro- .jection fits to prevent rotation of the washerr` relative to the tip, and means on said washer engaging into the materia-l of the barrel to pr vent rotation. of the tipand washer' relative to the barrel.

20. In a mechanical pencil, a barrel, a tip carried by the lower end of thebarrel, a bearing washer at the upper end of said tip, a rotatable actuating tubemounted in said barrel to have its lower end engage on said washer, said washer having a projection on its underside and a tip having a corresponding recess wherein the proing a. runner tube having a longitudinal slot'I therein, a lead carrier in said runner tube having a lug projecting through said slot, a Washer non-rotatably mounted on the runner tube and provided with seating means in alinement with the slot of the runner tube to receive and seat the lead carrier lug and means on the periphery of said Washer engaging into the material of the barrel to prevent rotation of the runner tube relative to the barrel.

DAVID KAHN.

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