US1546961A - Lead pencil - Google Patents

Description

July 21, 1925,

D. ZAKIM LEAD PENCIL Filed Nov. 8. 1922 anveutoz:

Patented July 21, 1925.

UNITED STATES PATENT OFFICE.

DAVID ZAKIM, OF NEW YORK, N. Y., ASSIGNOR TO STERLING METAL NOVELTY MFG (70., INQ, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LEAD PENGIL.

Application filed November 8, 1922. Serial No. 599,615.

To all whom it may concern: Be it known that I, DAVID ZAKIM, a citizen of Poland, and a resident of Bronx, in the county of Bronmcity and State of New York, have invented certain new and useful Improvements in Lead Pencils, of which the following is a specification.

The invention relates to improvements in mechanical lead pencils of the clutch and propeller types, andit resides in the novel features of construction and relative arrangement of parts hereinafter described, and particularly pointed out in the claims.

The invention pertains particularly to the construction at the back end of the pencil,

this construction embodying a hollow or tubularplug member adapted to fit within and rotatably engage the outer end of the exterior barrel of the pencil and to receive in its outer end a rubber eraser and at its inner end to fixedly receive the outer or rear end of the lead-holding tube of the pencil. In the clutch type of pencil, the clutch tube may be open at both ends, in accordance with my invention, and the stick of lead may be inserted into said tube from either end, the outer end of the tube being exposed through said tubular plug member when the eraser is removed from said member and being closed by said eraser when the eraser is restored to position. In the propeller type of pencil, the lead-holding tube is gripped by the tubular plug member of my invention,the same as isthe clutch tube of a clutch pencil, but in view of the presence of the propeller rod within the lead-holding tube of apropeller pencil, the lead must always be inserted at the tip end of the pencil. My invention involves a novel hollow or tubular plug member to cooperate with the outer end of the barrel of the pencil and to grip at its inner end the lead-holdingtube and receive at its outer end a rubber eraser, said tubular member being screw-threaded into the barrel of the 1 pencil when thepcncil' is of clutch-type, and

rotatable within the end of the barrel of a 7 pencil of propeller type and notnormally removabletherefrom.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which: i

Fig. 1 is a centrallongitudinal section through a lead pencil of clutch type embodying the features of my invention;

Fig. 2 is a detached side elevation of the tubular plugmember of my invention shown as holding at its inner end the outer end portion of the clutch-tube and having in its outer end a rubber eraser;

Fig. 3 is a side elevation of the pencil illustrated in section in Fig. 1;

Fig. 4 is a vertical transverse section of the clutch-pencil, taken on the dotted line 4L4EOfFig.1; v a

Fig. 5 is a vertical'transverse section of the clutch-pencil, taken on the dotted line 55 of Fig.1;

Fig. 6 is a central longitudinal section through a pencil of propeller type embodying my invention, and

Fig. 7 is a view showing the tubular member of my invention, the lead holding tube and the rubber eraser detached from the pencil shown in Fig. 6, Fig. 7 being partly in section.

In the drawings, referring to Figs. 1 to 5, inclusive, showing a clutch type of lead penoil, 10 designates the outer metallic barrel of the pencil, 11 the lead-holding clutchtube, 12 the tubular outer end plug member by said member 12, and 1 1 an ordinary pocket clip of known character applied to the barrel 10.

The forward portions of the barrel 10 and lead holding clutch tube 11 are of usual type,

and hence require no special description, said portions being adapted to hold the stick of lead 15 in the customary manner.

The tubular plug member 12 is preferably in one integral piece of sheet metal and has a plain contracted inner end 16, an adjoin ing spirally threaded section 17, aplain sec Ition 18 and an annularly ribbed section 19 forming internal annular grooves 20 to a d of the section 17 of the member 12 is a;

pressed up thread and this thread is adapted to cooperate with an inwardly pressed spirally deflected lug '21 extending inwardly from the outer end portion of the ..barrel 10, said lug 21 takingthe of my invention, 13 a rubber eraser carried place of a screwthread and leaving the outer surface of the barrel 1O perfectly smooth with the exception of the depression to form the lug 21. The tubular member 12 may be screwed into and out from the outer end of the barrel by reason of the presence of the threaded section 17 on said member and the provision of the lug 21 in the barrel 10.

The forward end of the tubular member 12 has driven into it the rear end of the leadholding tube 11, and said end of the tube 11 fits so tightly within the member 12, especially within the plain section 16 thereof, that no other means is required for securing the two parts together. The lead-holding tube 11 is a split tube, the split being indicated in Fig. 2 at the reference numeral 22, and as shown in Fig. 1 the outer end of this tube 11 is driven into the tubular member 12 to a considerable extent, said end of the tube 11 being extended from the forward endof the tubular member 12 to about the outer edge of the threaded section 17 thereof. The plain section 16 of the tubular member 12 is contracted tothe dimensions of and grips the tube 11 throughout a considerable extent thereof and not only is in very firm engagement with the outer surfaces of the tube 11, but cooperates with the other portions of the member 12 in preventing tilting action of the tube 11 within the barrel 10. The drive fit of the tube into themember 12 renders a separation of the tube 11 from the member 12 substantially impossible without the use of special tools.

In Figs. 6 and 7 I illustrate my invention as applied to a pencil of the propeller type, and therein 25 designates the exterior barrel of the pencil, 26 the lead holding tube, 27 the propeller rod in said tube, 28 a spiral guide for the lug 29 on the propeller rod, 30 the stick of lead and 31 the tubular outer end plug member of my invention, all of the parts just mentioned wit-h the exception of the tubular outer end plug member 31, being of known character and disclosed in Letters Patent of the United States No. 1,431,510, granted to me October 10, 1922.

The outer end tubular member 31 has a forward plain section 32 into which the lead holding tube 26 is firmly driven, an adjoining outwardly swelled section 33 which closely but rotatably fits within the outer end portion of the barrel 25, an inwardly pressed annular groove 34, an adjoining tubular section 35 which closely fits within the outer end of the barrel 25 and beyond said section 35, an outer end portion which is exposed beyond the barrel 25 and comprises an annular outwardly pressed bead 36, a plain tubular section 37, an outwardly pressed annular head 38 and a plain tubular section 39. A rubber eraser 40 fits tightly within the outer portion of the tubular member 31 and extends inwardly beyond the heading 38 and into the plain section 37. The bead 36 forms a stop-shoulder and en gages the outer end of the barrel 25 and also adds to the finish of the tubular member 31. The annular groove 34 cooperates with a lug 41 pressed inwardly from the barrel 25 after the tubular member 31 has been inserted into the outer end thereof and entering the annular groove 34 of said member 31 for cooperation therewith. The lug 41 and groove 34 lock the tubular me1nber 31 in position within the outer end of the barrel 25 and at the same time permits,

said member 31 to be rotated within the outer end of the barrel for the purpose of effecting the longitudinal movement of the propeller rod 27. The spiral guide 28 is rigid with the barrel 25, and hence when either the member 31 or the barrel 25 is rotated, the propeller rod 27 is given longitudinal movement outwardly or inwardly according to the direction of rotation of the barrel 2-5 or member 31. The lead holding tube 26 is rigid within the plain section 32 of the tubular plug member 31 and is carried by said member, and hence has no rotary movement except with the member 31. Ordinarily the barrel 25 will be held in the left hand and the tubular plug member 31 rotated by means of the thumb and finger of the right hand in moving forwardly or retracting rearwardly the propeller rod. 7

My invention therefore pertains more particularly to the tubular outer end plug member of the pencil, said member entering the outer end of the barrel of the pencil and being rotatable therein and at its inner end ei'iioiently holding the outer end portion of the lead-holding tube and at its outer end receiving and exposing a rubber eraser and affording gripping surfaces by which the said tubular plug member may be rotated either on being screwed into or from the barrel of the pencil, as in the clutch type of pencil, or on a fixed line, as in the propeller type of pencil.

My invention is not limited to all the precise details of form and construction hereinbefore described, since I am aware that some thereof may be changed or modified without departure from the spirit of my invention and within the scope of the appended claims.

hat I claim as my invention and desire to secure by Letters Patent, is

1. A mechanical lead pencil of the character described con'iprising an exterior sheet metal barrel portion, an interior sheet metal longitudinal leadholding tube, a sheet metal tubular plug member fitting Within and rotatably connected with the outer end of said barrel portion: and projecting outwardlv beyond the same, and a removable plug fitted into the outer end of said tubular plug member and closing and exposed beyond the same, the outer end portion of said lead-holding tube being rigidly within the inner end portion of said tubular plug member and said tube being open at its outer end and adapted at said end, on the removal of the removable plug, to receive the stick of lead.

2. A mechanical lead pencil of the character described comprising an exterior sheet metal barrel portion, an interior sheet metal longitudinal lead-holding tube, a sheet metal tubular plug member fitting within and rotatably connected with the outer end of said barrel portion and projecting outwardly beyond the same, and a removable plug fitted into the outer end of said tubular plug member and closing and exposed beyond the same, the outer end portion of said lead-holding tube being rigidly within the inner end portion of said tubular plug member, and said tubular plug member being at its inner end portion contracted to the dimensions of the lead-holding tube to tightly grip the same and outwardly beyond said contracted portion having a spiral thread pressed therein, and said barrel in its outer end portion having a lug pressed inwardly therefrom to cooperate with said spiral thread.

Signed at New York city, in the county of New York and State of New York this 3lstsday of October, A. D., 1922.

DAVID ZAKIM.

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