US1473412A - John c - Google Patents

Description

Nov. 6 1923.

J. c. WAHL MAGAZINE PENCIL Filed April 2, 1919 Patented Nov. 6, 1923 UNITED STATES PATENT, orrics.

JOHN C. WAHL, OF CHICAGO, ILLINOIS, ASSTGIIOR TO THE W'AHll COMPANY, OF WIL- MINGTON, DELAWARE, A CORPORATION OF DELAWARE.

Application filed April 2,

To all whom it may concern 1 Be it known that I, JOHN C. VVAHL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in Magazine Pencils, of which the following'is a specification.

My invention is a magazine pencil of the type in which there is a lead of small diameter propelled through a tip by suitable means, and in which the casing contains a surplus supply of such leads.

The object of my present invention is the provision of a magazine which shallcontain a surplus supply of leads and providing this magazine with automatic means to bring a fresh lead into position to be'used when necessary' To this end I have provided a cylindrically shaped magazine provided with a plurality of holes for containing extra leads, and have mounted this magazine so that it may be revolved in reference to the feeding means and thereby bring a fresh lead into position to be used. When all the leads in the magazine have been used, the pencil may be taken apart and the magazine refilled with a new supply.

My invention will be best understood by reference to the accompanying drawings, of which Fig. 1 is a. longitudinal sectional view of my improved pencil;

Fig. 2 is a section along the line 22 of Fig. 1;

Fig. 3 is a perspective view of the magazine;

Fig; 41 is a perspective view ofthe maga zine showing" its arrangement in reference to the lead feeding means;

Fig. 5 is a section along the line 5-5',of

ivrneezrnn PENCIL.

1919 Serial No. 286,963.

into which is adapted to be screwed a crossupper end with a plug 19, which is revolv- I ably mounted in the interior of the casing 1.3. The rods 17 and 18 are united at their lower ends by a cross piece 20. A sleeve 21 .is mounted on the plug 19 and afi'ords a support for an eraser 22, and also affords means to turn the plug 19 and thereby advance the crosshead 15 relative to the upper part 12 of the pencil casing. The lower part of the pencil casmg 10 has permanently mounted therein a tube 28, in which is supported a steel tip 24, and which is preferably provided' with longitudinalridges, as disclosed in Patent No. 1,151,016, granted to Charles R. Keeranunder date of August 24, 1915. A lead 25 is adapted to be forced through the tip 2 1 by means of the push rod 16 'attached to the cross-head 15. As will be evident from inspection of Figure 1, the casing 10 has on its lower end a conical part 26, and at the upper end of this conical part a disk 27 is fixedly mounted in the casing 10 to form a support for the cylindrical magazine 28. This magazine is provided with a pivot 29, whichlextends through a hole in the disk 27 and is also provided with a spiral spring 30, one end of which is fastened to the pivot 29, and the other'end of which rests against a tube 31, which is attached to the washer 27 and forms a prolongation of the tube 23. The magazine 28 is provided with a plurality of cylindrical holes 32, which are of the diameter of the leads to be used in the pencil, and the -magazine 28 is approximately the length of said leads.

The upper portion of the magazine '28 is provided with a raised portion 33, Fig. 4:), and the magazine is also provided with a. series of ratchet teeth 84:. These ratchet teeth are adapted to be engaged by a pawl 35, mounted on a stud screw 36 mounted on a disc'3? fastened in the end of the lower casing 10, as shown in Fig. 1f mounted on the disc 37 tends to hold the ratchet 35 into contact with a'tooth 34;, the position oi said teeth being: such that when the magazine 28 vis held by the pawl 35 against the tension of the spring 30, which A spring 38 it will be remembered tends to revolve the magazine, one of the holes 32 will be in line with the plunger 16. The holes 32 are provided at their upper ends with a conical Jortion 39, shown in section in Fig. 6. The detent is provided with a nose 40, which is adapted to be operated on by the plunger 16 when said plunger enters one of the holes 32, and the nose is wedgeshaped so that entrance of the plunger 16 into one of the holes 32 will move the pawl 35 out of engagement with the ratchet teeth 34:.

The operation of my improved pencil is as follows: Assume that it is desired to insert a new lead into the tube The sleeve 21 is turned by hand, thus turning the rods 17 and 18, which in turn rotate the cresshead '15 in the screw thread 14: and withdraw the plunger 16 from the hole 32 in the magazine. As the bottom of the plunger presses against the wedge-shaped nose 40 the pawl 85 will move into a position to engage one of the ratchet teeth 34:. However, on ac count of the cone 39011 the ends of the holes 32, the magazine 28 will turn slightly and the pawl 35 will not engage the ratchet tooth 34 opposite the hole 82 just engaged by the plunger 16, but on account of the slight rot-ation of the magazine 28, due to the spring 30, the pawl 35 will rest on the surface of the magazine. When the plunger 16 is withdrawn from engagement with the conical portion 39 of the hole 32, the magazine willrotate under the influence of the spring and the pawl will drop into the tooth 34: associated with the next hole 32, and pre vent further rotation of the magazine. As before noted, when the parts are in this position, the hole 32 is in line with the plunger 16, and the lead contained in said hole is then in a position to be inserted into the tube'23 when the plunger shallbe again advanced by rotation of the sleeve 21. Upon the advance of the plunger 16, the end oi? said plunger re-engages the wedge-shaped nose 40 and thus moves the ratchet out of engagement with the tooth 3 1. However, further rotation of the magazine is prevent ed by the engagement of the conical end 39 with the plunger lfi. Further advance of the plunger will result in bringing tlie holo 32 into line and the lead may then be pro-- pelled through the tip 2 1. When this lead is used, the operation just described may be repeated.

When all the leads in the magazine 28 have been used, the same may be loaded; by

unscrewing the upper portion 12 ot-the cas ingfrom'the lower portion 10, filling the magazine with new leads. and winding the magazine up a full turn, where it will be held byengagement of the pawl 35- with the ratchet teeth 34. The uppin and lowerportions of the pencil maythcn be put together and the encil is ready tor-use.

Many variations and improvements may be made in the precise device herein shown without departing from the spirit of my in vention, since I claim:

1. In a mechanical pencil, the combination of a pencil casing having aperture adapted to hold a lead and a spring-driven magazine rotatably mounted in said casing and having its axis of rotation offset from said central aperture.

2. In a mechanical pencil, the combination of a pencil casing having a central aperture adapted to hold a lead, a magazine rotatably moun ed in said casing, a series of ratchet teeth on said magazine, the position of said teeth determining the position in which one of said leads may be fed into said central aperture, a pawl adapted to co operate with said teeth and thereby hold said magazine in a given position, and a plunger adapted to operate said pawl.

3. In a mechanical pencil, the combination of a pencil casing having a central aperture adapted to hold a lead, a magazine rota-tably mounted in said casing, a series of ratchet teeth on said magazine, the position of said teeth determining the position in which one of said leads may be fed into said central aperture, a pawl adapted to cooperate with said teeth and thereby hold said magazine in a given position, and a screw actuated plunger adapted to operate said pawl.

a. In a mechanical pencil, the combination of a pencil casing having a cent 'al aperture adapted to hold a lead, a magazine rotatably mounted within said casing and adapted to hold a plurality of leads, and automatic means including a pawl and ratchet action to rotate said magazine relative to said casing, whereby the leads contained in v he ma azine maybe brought into a position to be used.

5.111 a mechanical pencil, the con1bination of a casing, a cylindrical magazine mounted therein, a series of holes in said magazine, a plunger adapted to be reciprocated in said casing and enter said holes, a pawl adapted to hold said magazine in a series of predetermined positions, and a nose on said pawl. adapted to be actuated by said plunger, vhereby the reciprocation of said plunger controls a step by step rotation of said magazine.

6. In a mechanical pencil the co1nbination of a pencil casing having a central aperture adapted to hold a load, a magazine'rotatably mounted in said casing and havin -g its axis of rota-tion 'ofiset from said central aperture. and spring means-mounted w'i-tl'i-in sa d casing tor placing a reserve lead in the central aperture upon the exhaustion of the lead therein, and the withdrawal of the feed wire fromthe said magazine.

7. In a mechanical pencil, the combination of a pencil casing having a central aperture adapted to hold a lead, a magazine rotatably mounted in said casing and having its axis of rotation ofiset from said central aperture and spring means mounted Within said casing for automatically rotating the same, thus placing reserve lead in the Gen tral aperture upon the exhaustion ,of the lead therein, and the Withdrawal of the feed wire from the said magazine.

In Witness whereof I have hereunto subscribed my name.

JOHN (J. WAHL.

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