US1637363A - Mechanical pencil - Google Patents

Description

yAu 2 192 g 7 J. c. WAHL MECHANICAL PENCIL Filed July 17 1925 5 Sheets-Sheet 1 I l1 I ./5. Ilalll/ ...lll/H. I I n /H.

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J. C. WAHL MECHANICAL PENCIL Filed July 1'7 1925 3 Sheets-Sheet 2 5 f@ x Y I!! IIIIII I` IgA/Ma@ 1,637,363 All8 2f 1927' J. c. WAHL MECHANICAL PENC I L Filed July 17. ,1925 s sheets-sheet 5 IQ/y Ji 9 g 56 JE r; yf un J5 dd Z/yj /7 EO E2 l I v 4 5 /9 i U i Patented Aug. 2, 1927.

vUNITED STATES PATENT OFFICE.

1 J' OHN C. `WAHL, OF CHICAGO, ILLINOIS, ASSIGNOR TO '.'LIEIE WAHL COMPANY, Ol' CHI- CAGO, ILLINOIS, A CORPORATION OF. vDELAWARE. I

.MECHANICAL PENCIL,

Application med Iuiy 17, 1925. serial No.. 44,1111.l

My invention relates to a pencil of the type in which the lead is moved longitudinally through the ltip by mechanical means.

Among the objects of my invention` is the 15 provision of a mechanical pencil in which the lead may be propelled, repelled and cX- pelled through thetip, and it contemplates novel means for effecting these results.

A further object of my invention isv the provision of a pencil shorter in length than the usual mechanical pencil, and comprising such an arrangement of interior parts as to make possible the incorporation of a novel lead magazine without increasing the length of the pencil. Another object of my invention is the provision of a novel form of lead magazine that may be used in either a long or short ncil, as desired, but is of especial value in a short pencil, in which it is vital'to conserve longitudinal space.

-A further object of my invention is a' novel combination of the lead magazine and the lead propelling, repelling and 'expelling mechanism.

A further object of my invention is the provision of a more simple, economical and eilicient pencil of the mechanical type.

Other objects, advantages and capabilities will hereinafter more fully appear.

My invention further resides in thecombination, construction and arrangement of parts shown in the drawings, and while I -have shown a preferred embodiment I wish it to be understood that the same .is susceptible of modification and change without departing' from the spirit of my invention.

In the drawings Fig. 1 is and partly in section of a pencil embodying my invention.

Fig. 2 is a longitudinal section of the upper portion oi my improved pencil.

Fig. 3 is a longitudinal section of the re maining portion of the pencil extending from the line' X-X at the bottom of Fig. 2 to the tip of the pencil. V v

Fig. 4 isa fragmentary longitudinal section of a portion of the pencil, showing the two orosseheads in their normally spaced apart positions which they occupy when there is a substantial amount of lead vin the pencil. i

Fig.

of the tapered portion 2 is a side view partly in elevation.

. I .16 of the actuating rin 5 is a fragmentary longitudinal section of the lower portion-of the vpencll show.

in'g the lowercross-head in engagement with the threads or smaller pitch, and the upper cross-head in leady expelling position.

Fig. 6 is a side elevation partly'broken away of the inner tube, which carries the threads for .imparting motion to the' crossheads, the upper left hand mcm'ner being shown in section lfor the sake. of clearness.

Fig. 7,-" is a transverse cross-section taken on a plane through my pencil indicated on the line 7--7 of Fig. 4. Fig. 8 is an end view Fig. 6. l

Fig. 9 is a detailed side tube and associated parts for actuating the two cross-heads.

Fig. 10 is a detailedI perspective view partly broken away of the member forming the lead magazine.

Fig: 11 is a perspective detail ofthe lead gripping and carrying tube. A

' Referring to the drawings 'my invention comprises an outer casing 1, at its lower` end the tapered portion `2 terminating in the tip 3, which tip, as shown in Fig. 5, is formed. with longitudinal ,opening t of a size to snugly permit longitudinal movement of the lead 5 therethrough. Fixed to the inside of casing 1 at a point adjacent lthe upper end a transverse member 6, having a longitudinal bore 7, in which is secured the upper end 8 'of the tube 9, the lower end. ofwhich tube is suitablyand snugly fitted within the lower portion of the tapered end 2 of the pencil, with theJ looking down upon elevation of .the

bore of tube V9 and the bore in tip 3 in alignment. Fixed to theinterior'of casing 1 to rotatetherewith is the tube 10 which, as shown in Fig. 5, engages at 11 with-the transverse member '6. f 'I Tube 10 is formed with interior' threads 12 throughout the Vgreater 'portion of its length, which threads 12 at their lower end merge into threads 13, which are of less pitch than threads 12, for a purpose to be Ahereinafter more fully set `forth. Near its upper end the tube 10 is formed with' aninwardlyl extending circumferential bead 14, and is also provided at diametrically opposite sideswith longitudinal slits'15 to permit during assembly the entrance at this 4end of the tube of the tubular' extension 17, withsuch a t Fixe'd to rotate with the actuating ring 17 is the inner actuating tube 18 which, as shown in Fig. 9, is provided with diametrically opposite longitudinal slots 19, in which slots the edges of the cross-heads 20 and 21 `threads 22 and 23 of cross-heads 2O and 21 are of such size and arrangementthat the will operatively 1engage either of threa s 12 or 13, which is especially true of the lower cross-head` 21, which atthe lower end of its movement moves ,into full engagement with threads 13, as shown in Fig. 5, which is the lead expelling position of the crossheads.

As seen in Fig. 2, the lowercross-head 21 is provided with a lon itudinal bore, in an enlarged portion of whlch is secured the upper end of the lead gripping and carrying tube 24 which, when the cross-heads are in their uppermost osition, as shown in Fig. 1, enters a short distance into tube 9. Fixed in the upper cross-head 20 is a plunger rod 25, which extends, as shown in Fig. 3, nearly to the lower end of lead gripping tube 24, when the cross-heads arein thelr uppermost position. This leaves aportion 26 (see Fig. 3) of the lead gripping tube available at the lower end of the plunger rod 25 for gripping and securely holding the upper end of the lead, which is facilitated by the resilient nature of the material of tube: 24, and the provision of a lon itudinal slit 27 lengthwise of this tube, whiclfi tube is normally slightly lesei in diameter than the diameter of the lea `The actuatin ring 17 has an upwardly extending tubu ar portion 28, upon which is screw-threaded the sleeve 29, carrying the eraser 30 and the eraser securing member 31, the bottom of which latter member also forms a closure for the lead magazine about to be described.

The general construction of the main operating parts of this pencil is substantial- -ly the same as those described and, claimed in my co-pendin application, Serial No.

' 44,190, filed July 1 1925. The present pencil, however, being much shorter in length than that shown and described in my said eo-pendin application, necessitates an entirely di erent form of magazine for the extra leads;

The main construction of this magazine is shown in pers ective in Fig. 10, and comprises parts pre erabl stamped from a single piece of metal, alt ough I wish it -understood that the same might di'er somewhat from thisexact construction, -without departing from the` spirit of my invention.

I he form of magazine chosen for illustrative purposesin this application comprises the two downwardly depending legs 32 and 33,

which are joined together at their upper end by the 'plate member 34, having the projecting ends 35 and 36. The marginal edges of legs 32 and 33 are angularly bent to form the side portions 37, 38, 39 and 40, respectively, which side portions form the sides of the two lead magazines ositio'ned one upon each side of the crossads. The lower ends of legs 32 and 33 are bent outwardly at right angles to form the end portions 41 and 42, respectively, whose functions are toformthe bottom of the lead magazine.

It will be noted that the edges 35 and 36 of the plate 34 are arcuately shaped so as snugly to fit the inner peripheral wall of the tube 18. Likewise the edges of the end portions 41 and 42 are arcuately shaped to lit the inner wall of the tube 18. By reference to Figure 10, it will be seen that the two legs 32'and 33 are substantially resilient due to their connection at the late 34 and hence when this unit is inserte within the tube 18 the legs 32 and 33 will tend to spread so that the end portions 41 and 42 will frictionally gri fthe inner walls of the tube 18 and hold t e magazine member firmly in.

If desired the.' member Vmay be position. p soldered or otherwise retained in such posi tion but the constructionfl'shown and described is simple, economical and effective.

In assembling these parts the legs 32, 33, of cross-bar 34, and their associated parts, are inserted into the actuating tube 18, with the cross-heads 20 and 21 occupying a osition between legs 32 and 33, the edges o which cross-heads, as stated above, also extend through slots 19 for engagement with the threads-in tube., 10. The extending ends 35 and 36 of cross-bar 34 prevent the inadvertent dropping of an extra lead into that portion occupied by the`cross-heads. These lead magazines are made available by unscrewing sleeve 29 from the threaded extension of actuating ring 17, thus giving ready and easy access to the extra leads. By positioning the cross-heads between legs 32, 33, of the lead magazine the length of the pencil is very materially decreased.

The operation of my pencil isfas follows:

The operatorby grasping the easing 1 in one hand .and rotating 'theactuating ring 17 with the other causes a rotation of the two cross-heads 20 and 21, it bein assumed that in starting this-operation't e cross-heads stand in their uppermbst position, as shown in Figs. 1', 4 and 9. This rotation causes the crossheads, which in this position engage threads 12,-to move longitudinally of the casing simultaneously and at the same speed until the lower cross-head 21 comes into en.

gagement with the'threads 13 of less pitch,

ping tube 24 into the position shown in Fig..

5, which will completely expel the remaining fragment of lead from the tip. During the movement of the cross-heads prior to engagement of l the lower cross-head with threads 13 the p-lunger rod Q5 and lead gripping tube 24 will move together toeither propel the lead through the tip or repel the same, depending upon the direction of rotation of the cross-heads. Y

It will thus be seen that I have provided a propel, repel, expel pencil that can be constructed of small length, and have incorporated in the same a novel andpreadily A outwardly at substantially right angles to available magazine for extra leads.

1.. In a mechanical pencil, a casing, an actuating tube, an actuating member longitudinally movable in said tube, and a pair of elongated members insertible into said tube N,tofstraddle said actuating member and having sides and bottoms cooperating with said tube to deiine a lead magazine.

2. In a mechanical pencil, a casing, an elongated hollow actuating element rotatable in said casing, and a magazine member vinsertible into said hollow element, said member having .a pair of depending legs, each of the legs having sidesand a bottom contacting at their outer edges with the inner walls of the hollow element to form a pair of spaced magazines for eXtra leads.

3. In a mechanical pencil, a tubular member, and means forming' a lead magazine comprising a pair of spaced apart legs, each of said legs having outwardly7 extehding sides and an angular bottom, and a top member uniting said legs to permit them to be simultaneously inserted into the interior of a pencil to cooperate with said member to define compartments for extra leads.

4. In a mechanical pencil, a casing having internal threads, a slotted actuating tube rotatable in the casing, a magazine element insertible into the tube and having a pair of depending legs each of which is provided with sides and a bottom bent outwardlyT to contact with the inner surt'ace of the tube to form a pair of spaced lead magazines, and a cross-head the edge of which extends through the slot of the tube` into threaded en-` gagement witlrsaid internal threads, said crosshead having longitudinal movement between said legs upon rotation of the actuating tube with relation to the casing.

5. In a mechanical pencil, a casing having internal threads, a slotted actuating tube rotatable Lin the casing, a magazine member insertible into the tube and having a pair or dependinglegs each of. which is provided with sides and a bottom bent outwardly to contact with the inner surface of the tube. to form a pair of spaced lead magazines, and a cross-head the edge of which extends through the slot of the tube into threaded engagement with said internal threads, said cross-head having longitudinal movement between said legs upon rotation of the actuating tube with relation to the casing, and removable means for closing the open ends of said lead magazines.

v6. A magazine member for mechanical pencils, said member being made from a single flat piece ot metal and :termed to have a fiat centrall portion w-ith extending ends, and a pair otdepending legs, each of said legs being bent at right angles to the central portion and formed with outwardly bent sides and a bottom portion extending its respective leg. -4 y 7. In a mechanical pencil a casing, lead propelling mechanism in said casing having an actuating tube, means forming a lead magazine in said tube comprising a pair of downwardly depending spacedV apart legs, each of said legs having `outwardly extending sides and an outwardly extending bottom substantially engagingthe inner sur-4 face of the tube.

8. In a mechanical pencil, an actuating tube, means forming a magazine for eXtra leads in said 'tube comprising a pair of spaced apart legs connected at their upper ends and extending downwardly 'therefrom in said tube and having bent sides and bottoms engaging the inner surface of the tube, and propelling elements longitudinally movable between said legs.

9. In a mechanical pencil, an actuating tube, means forming a magazine for eXtra leads in said tube comprisinga pair of spaced apart legs longitudinally disposed in said tube and having bent sides and bottoms engaging the inner surface of the tube, propelling elements-longitudinally movable between said legs, and a. removable cover for said magazine. n

10. In a mechanical pencil, a tubular element, a magazine member having spaced apart legs adapted to cooperate with said element to define two lead chambers, and

means for connecting saidlegs at their upl per ends and adapted as an end closure for the space between said legs.

11. In a mechanical pencil, a casing having threads, a rotating actuatingtube there- `in and `means forming a lead magazine comprising a sheet metal member disposed within the actuating `tube and bent to provide spaced resilient legs having portions ada ted trictionally to engage the inner walls o the tube and form a lead 'chamber therewith and detachably to hold the lead magazine forming means in position within the actuatingl tube and an actuator disposed within the.

and a cap adapted to close the rear end of said magazine.

13. In a mechanical pencil, a threaded casing, an actuating tube Within the casing, a member within the actuating tube and having parts cooperating with the aetuatin tube to define a lead ma azine, and a lea feeding member disposed within the first mentioned member and projecting through the Walls of the actuating tube tp engage the threads of the casing.

In Witness whereof, I hereunto subscribe my name to this specification.

JOHN C. WAHL.

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