US1604863A - Mechanical pencil - Google Patents

Description

Oct. 26 1926.

J. C. WAHL MEGHANIQAL PENGIL fill!! tlv lill@ Patented Qct. 26, 1926.

MNE'EED JOHN C. WAHL, OF CHICAGO, LLINOIS,

ASSIG-NOR TO THE 'WAHL COMPAN'Y, OF

CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

MECHANICAL PENCIL.

AjppIicaton filed March 28,1921.

My invention relates to improvements in pencils, and is especially concerned with improvements in that type ofpencil which come prises a barrel made of metal or other suitable material having a passage therein for receiving and holding the leads, and suitable means for extruding the end of the lead through one end of the barrel so that it can be used for writing.

The objects of my invention are z- First: To provide a pencil of this chan acter comprising a novel means for eXtruding or feeding the lead from the end of the pencil,` and Second: To provide a pencil of the character described, which is simple of construction, economical to manufacture and easy to operate.

These and other objects will definitely appear as the description progresses, reference being had to the accompanying drawings, in which A A Fig. 1 is a longitudinal sectional view of my improved pencil, showing the parts in their assembled position.

Fig. 2 is a fragmentary longitudinal sectional view of my improved pencil showing the propelling mechanism in its operative position. p v

Fig. 3 is a perspective view of that part of the pencil showing the cap and clip attached to the pencil barrel.

Fig. 11 is a disassembled view of some of the parts of the pencil and showing their relation to each other.

Fig. 5 is a cross sectional view on the linel 5 5 of Fig. 1, and

Fig. 6 is an assembled view of the feed wire and cross head.

With reference to the drawings, 10 indicates an outer barrel or casing swaged as at 11 and forming an aperture in which is inserted tlie.`rifled tip 12. Detachably mounted in the interior of the barrel or casing 10 are lead magazines 13 and 14,said maga- .'Zines being constructed of two lengths of hollow tubing. These lead magazines are held in relation to each other by being soldered to an exteriorly threaded cap 15 and to the plug 16. The threaded cap 15 has two openings therein which are in alignment with the hollow portion ofthe lead magau Serial No. 456,354,

zines 13 and 111, thus allowing the insertion of extra leads in the magazines or their withdrawal therefrom when desired.

An eraser holder, threaded interiorly, and so constructed as to receive an eraser 18. is provided. The interior threads of the eraser holder 17 engage the exterior threads of the cap 15, said eraser holder being knurled in order to form a better rgripping surface when it is desi-red to either propel or repel the lead in the lead guide.

The barrel 10 is threaded interiorly, commencing imediately below the shoulder 37, (see Fig. 4) and inasmuch as said threads engage the teeth in thecrosshead 20, as hereinafter described, it is not necessary to extend the threads below that point in the barrel beyond which the said crosshead 2O is prevented from going by reason of its contact with the plug 16.

The lead magazines 13 and 14- are so constructed as to form grooves 30 and 31 on the side of the magazines the greatest distance from the barrel 10, as is best shown in Fig. 5. Loosely mounted between the magazines 13 and 14 is a crosshead 2O having teeth 21 which are adapted to engage the threaded interior of the barrel or casing 10. On the face of the crosshead are upstanding lugs 22 which are adapted to ride in the grooves 30 and 31 of the magazines 13 and 1li. r1`his arrangement is necessary to prevent the crosshead from falling out of the magazines upon the withdrawal of the said magazines from the pencil barrel. As this arrangement of parts broadly does not in any way form a part of my invention, and as it is more clearly and completely explained. in Patent No. 1,130,741 granted to Charles R. Keeran under date of March 9, 1915, it is not believed necessary at this time to incumber this application with a minute detailed description of same, except tc point out that the upstanding lugs 22 are stamped from vthe material of the cross-head by forming with a suitable tool a depression on one side which forces the material through on the other side, as suggested in my Patent 1,4190,- 2116 granted April 15, 1924-, on an application copending herewith.

A feed wire 23 is tixedljf attached to the crosshead 20 and adapted, as hereinafter crosshead is equal to the distance between the thread 24 in the barrel 10 andthe under `side of the cap :15. This extension ofthe feed wire is made necessary to prevent the teethof-the crossheadr20 froinrbeeoining disengaged with the threads of the barrel 10.

When the cap 17 is turned in a counter-clockwise directiomwhichin turner-evolves the cap 15 .to which is soldered "the lead magazines 18 and 1l,`causing the crosshead 16 to move in an upward direction, the feed wire eX- tending above the crosshead will abut the underside of the cap 15 when the teeth 88 in the crosshead has arrived at-that point in the barrel where, without the said extension of the feed wire, the tooth of the crosshead lwould become disengaged from the threads in the barrel 10. Asfit may be clearly seen, at no time can the operator inadvertently disengage the crosshead fromits proper position in the barrel. Y

Upon .further reference to the drawings, especially Fig. lgrit will bel observed that the clip 25 consists of alprong 26 and a base or supporting i portion 27. The base portion 27 has a flange 28 swaged thereon and said flange is adapted to contact with the inside of the barrel or casing `10. The `tliicli portion of the base 27 is adaptcdto fit into-the'hole 19 which is punched in the barrel 10, and the flange 28 preventsthe withdrawing ofthe clip 25 from tliebarrel 10. In order to hold the clip 25 in the casing, a shell 29 is provided and is adapted toV fitV insidelthe casing 10. This shell29, as may be seen in Fig. Lt, when `fitted into the barrel 10, will be soldered therein and the lowermost edge of the shell will `rest against ythe shoulder 37 in the barrel.

The clip described briefiy above is covered bv Patent No. 1,279,186 granted to John C. Vahl and lVilliam H. `@dlnm under date lof September 17, 1918, and 'as this clip is not embodied in my invention it is not thought necessary to fully describethe same.

A one-piece lguide funnel 32 is inserted in the lower `half of the barrel 10. Upon a turning ofithe cap 17 in a clockwise direction, the crosshead will. move downwardly andthe feed wire .will enter the guide lfunnel, coming in contact with the lead 88 and causing it Vto move out through the rifled tip 12 to the required length desired by the remesas party operating the pencil. The lead guide 32 is funneled as at 39 and the sides 34 litA snugly against the barrel 10 when the lead guide is inserted into the barrel. The lower end of the barrel 10 has a shoulder 35,

Vwhich is enlarged and is threaded interiorly,

is beveled in order to fit snugly within the swaged end of the barrel'lO. By inserting the rifled tip 112 into the aperture at ythe swaged end of the barrel lOandthe threads thereof becoming e-ngagedwith the threads of the lead guide, it will be seen by a constantY turning of the tip in a cloclwisedirection, it willihave'a tendency-to drawthelead funnel further down intothe swaged end of the barrel. rIhis downward pull ofthe lead guide can be continued until it. comes in contact witlrthevshoulder B5 of the barrel 10 which will Aprevent any :further downward movement. This arrangement will cause Va locking effect and will tend to hold the rifled tip and lead Vguide firmly yin position.

tIVhile I have illustrated and described vthe preferred form of construction for carrying my invention into effect, this is capable of variation and modification with- 4out `departure from theI spirit of the invention. I, therefore, do not wish to'be limited to the precise details of construction set forth, but desire to avail -myself of such variations and modifications as come within the scope of the appended claims.

AHaving described my invention, what I claim asnew and desire to secure by Letters 4Patent is 1. In a mechanical pencil, a barrel-having internal threads, ailead yfeeding mechanism comprising a cross-head having threads to engage the threads on the interior of -the barrel, a pair of spaced extra lead magazines rotatable together in said barrel-to cause rotative and longitudinal movement of said cross-head with relation to said barrel, the inner opposing faces rof said magazines being grooved, saidcross-:head'having projec- .tions stamped from thebody of the crosshead to project 'from the side `faces thereof, said `projections slidably fitting in said groovedportions to prevent the cross-head from falling ilaterally out of th'espace between `the lead magazines y,when removed from the barrel.

2. A mechanical pencil comprising a barrel interiorly threaded for a `portion of its length7 said threads beginning at a distance spaced inwardly vfrom the open upper end of the barrel, a cap removably mounted on said `open end, a cross-head having threaded engagement-with theV said threads on thev interor of the barrel, a plunger' lXed to said cross-head, and an upstandng rod on the end of the Cross-head opposite the plunger, the length of said rod being such that when the threads on the 0ross-head are nearly unthreaded from the threads on the inside of the barrel, the rod Will strike the inner face of said cap and prevent complete disengagement o'f said parts Without removal of said cap. 10

In Witness whereof I have hereunto subscribed my name.

JOHN C. WAHL.

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