US1552364A - Pencil - Google Patents

Description

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l Patented Sept-1 1,V 192,5.

,UNITED STATES PATENT o1-=1=llcla'.l.-

` FRANK J'. 'VIERLING AND FRED R. BARTHOLOMEW, OF MINNEAPOLIS, MINNESOTA,

ASSIGNORSTO STERLING- SPECIALTIES MANUFACTURING COMPANY, OF MINNE- APOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

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Application led September 30, 1920. Serial No. 413,708.

.I To all lwhom it may ciwem:

Be it known that we, FRANK J. VIERLING and FRED R. BARTOLOMEW, are citizens of the United States, residing at Minneapolis,

.5 in the county of Hennepin and State of Minnesota, have invented certain new andl useful Improvements in' Pencils; and we do hereby declare' the following to be afull, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same;

Our invention has for its object to provide an extremely simple and -highly eliicient pencil, and -to this end, the 'invention consi-sts f l5 Vof the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indi.`

cate like parts throughout the several views.

Referrlng to the drawings:I Fig. 1 is a perspective view of the improved pencil;

Fig. 2 is a view principally in longitudin 2.5 nal section taken centrally through the pencil on an enlarged scale;

Fig. 3 is a transverse section taken on the line 3-'3 of Fig. 2, on an enlarged scale;

Fig. 4 is a perspective view of the lead feeding mechanism removed from the casing, with some parts broken away and sectioned;

Fig. 5 is a perspective view 'of the casing with some parts broken away and sectioned; Y Fig. 6 is a perspective view of the cap shown in Fig. 2;

Fig. 7 is a perspective view of the lead holder shown in Flg. 2;

Fi 8 is a modification of the cap shown 40 in Flg. 6; and

Fig. 9 is a modification of the lead holder shown in Fig. 7

The numeral 10 indicates a cylindrical casing, the lower end of which is contracted to aiord aint 11. Upper and lower circumferentia internal grooves ll2 and 13, respectively, are formed in the easing 10 by 4pressing the same outward. The upper oove 12 affords a lockg'roove .for the lead eeding mechanism, as will presently -appear4 l `Afoap tube 14 is telescoped part way into the casing 10 and provided with a stop bead -'15 and a lock bead 16, both of which are cirmovement o the cap tube 14 into the cas# ing 10, andthe lock .bead 16 is arranged to enter the lock groove 12 and thereby frictionally secure said cap tube in the cas- 4 f To permit the lock bead -16 to spring Iinto and out of the lock groove 12, 'the cap tube 14 :is lon itudinally spiit or slotted at 17 so that sai y pushed into or pulled out of the casing 10v and expand when the lock bead 16 isbron ht into alignment with the lock groove 12. bvious by spreading the longitudinal edges of the tube 14 at the slot 17 apart, the frictional engagement of the cap tube 14 with the casing 10 may be increased at will. The upper portion of thecap 'tube 14 is knurled at 18 to afford a finger grip.

' A removable cap 19 has screw-threaded engagement with the -upper end of the cap tube capy tube will contract when" 14 to close the same. The lower portion of the cap tube 14 is contracted and then extended to aii'ord a sleeve 20 to receive and rigidly hold the upper end of a tubular feed screw 21 on which'is mounted a feed nut 22. To prevent the feed nut 22 from making a complete rotation in the casing 10, but allow axial travelling movement thereof on the feed screw 21,l there is formed in the casing 10, by pressing the same inward, a longitudinally extended stop rib 23, see Fig. 3. It is, of course, understood that in some in-` stances, it might be desirable to form a plu= rality of these ribs in the casing 10- as stops for the feed nut 22.

The feed screw 21 is axially located the casing 10 and its lower end is seated against the internal' tapered' walls of the casing point 11 to hold the4 same against lateral;

the sleeve 20 from the lower, end thereof.

The upper end of the feed screw 21 is'closed and forms g Qlthe cap tube 14,

which cap tube affords a compartment X normally closed -by the cap 19 for a supply of extral leads.

Mounted for endwise movement in the feed screw 21 is a tubular lead feeding stem 25 formed, as shown, by folding a single sheet of metal, the upper extremity of which, at the seam, is extended radially outward to afford a blade 26. This blade 26 extends through the guideslot 24 for travelling movement therein and is. provided with an intermediate notch 27 to receive the feed nut 22 and thereby connect the leadinto said stem to afford a stop 30 to limit the endwise movement of the lead Z into the lead feeding stem 25.

Obviously, by turning the cap tube 14 in the casing 10, the feed screw 22 may be turned in either direction to thereby impart an end wise movement to the lead Z, either to project or retract the same in the vpoint 11. By drawing outward on the cap tube 14 with suiiicient force to cause the lock bead 15 to cam itself out of the lock groove 12 under the contraction of the cap tube 14, the entire lead feeding mechanism may be withdrawn from the casing 10. l

To prevent the blade 26 from striking the upper end of the guide slot 21 and thereby bending the same during the receding movement of the lead feeding stem 25, the lower 'end of the stem 20 is arranged as a stop 20' for-the feed nut 22.

The modified cap 31 shown in Fi 8, is adapted to be screwed into the lead ceding tube 14 the same as the cap 19, and has attached to its screw-threaded end an eraser 32. To use the eraser 32, the cap 31 may be unscrewed from lthe cap tube 14, inverted and the top thereof inserted into said cap tube.` The two circumferential surfaces 433, on top of the cap 31, are of the same diameter andof such size as to tightly t Within the casing. 10 and frictionally hold said cap in position while the eraser 32 is being used.

Referring now to the ymodified form of lead holder shown in Fig. 9, the same is formed from a closed tube 34, and a. notched blade 35, for the feed nut 22, is formed on the upper end of a rod 36 which is forced into the tube 34 from the upper end thereof and held in place by friction. The tube 34 notched just below the lower end of the rod 36, to leave ltherebelow a pair of lead l holding 4 jaws 38; holder, the lowerend of the rod 36 affords a stop for the lead Z.

It is evident that the-casing 10 shown in detail in Fig. 5 constitutes an outer casing; that the cap tube 14 and tubular feed screw 21 combined form an inner casing; and that, when the device shown in Fig. 9 is inserted within the tubular portion 21 .of the inner casing, that the device then comprises inner and outer telescoped casings, a stem centrally supported in the inner end of the inner casing and projecting toward the outer end of the outer casin anda sleeve surrounding the stem an projecting beyond the same, the projecting portion ofv said sleevelforming a lead holder;

What we claim is:

1. A pencil comprising. a casing, a tubef telescoped into the casing and having movable frictional engagement therewith, said tube having a longitudinal slot terminating short of its ends which permits circumferential contraction and expansion of the tube, lead-engaging means on the tube, and a circumferential lock groove and a projection extendingtherein, one of which isY formed in the casing and the other of which is In this form of lead formed in the tube, said lock groove and' projection being located intermediate of 'the ends of the slot in the tube.

2. A pencil comprisinga casing, a tubular feed screw mounted in the casing and hav.

ing a longitudinal guide slot, a feed nut on .the feed screw, means for holding the feed nut against rotation in the casing but with 4 able with the other member to limit -telel scopical movement of the two members, a stem centrally disposed in the inner member, and a sleeve surrounding said stem and having a portion projecting beyond said stem, said sleeve portion forming a lead'holder.

4. A pencil comprising inner and outer telescoping members relatively longitudinally movable, said inner member having a longitudinal slot terminating short of its ends, a stop on one of said members engageable with the other member to limit tele-- scopcal movement of the two members, a stem centrally disposed in the inner member, and a sleeve surrounding said stem, percasing, and a sleeve surrounding said stem manently secured thereto and having a porand projecting beyond the same, the protion projecting beyond said stem, said jecting portion of said sleeve forming a lead sleeve portion forming a lead holder. holder; l

5 5.\A pencil comprising inner and outer In testimony whereof We aHiX our signatelescoping casings relatively longitudinaltures. ly movable, a stem centrally supported in the inner end of the inner casing and pro- FRANK J. VIERLING. jectin'gtoward the outer end of the outer FRED R. BARTHOLOMEW.

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