US2072922A - Pencil - Google Patents

Description

March 9, 1937. C. F, NQRLlNV 2,072,922

PENCIL Filed Aug. 19, 1935 Patented Mar. 9, 1937 UVNiTED STATES PATENT OFFICE 11 Claims.

The present invention relates to improvements in pencilsV and more particularly to manually operated feeding mechanisms for pencils of the so-called magazine type, wherein leads to be successively used are fed as needed from the li magazine into the tip bore of the pencil, the present invention being an improvement on that set forth in my pending application, Serial No. 735,174, filed November l5, 1934, and in my prior Patent No. 1,937,779, granted me on December 5, 1933.

'Ihe primary object of the present invention is to provide a simple feed mechanism adapted to the' purpose, which is capable of economic production and highly elcient in use.

l Other objects will appear-hereinafter.

The invention consists in the combinations and arrangementsofv parts hereinafter described and claimed.f

The invention will be best understood by reference to the accompanying drawing forming a part of this specification and in which: f

Figure 1 is an enlarged-sectional view taken longitudinally through such a pencil showing a mechanismfor the -storage of leads and a feeding mechanism adapted to feed leads therefrom and embodying the invention;

Figure 2, is a section taken substantially on the line 2-2'of Fig. -1; y

Figure 3 isa section taken on the line 3-3 of igure 4 is a sectiontaken on the line 4 4 of Fig. 1;

vFigure 5 is -a top plan view of the sleeve and plunger removed from the barrel of the pencil;

and

Figure 6 is a sectional view taken on the line 6--6 of Fig. 1.

The embodiment of the invention illustrated in the drawing comprising a barrel I0 havingr a tip IIL provided with a lead bore I2 and a magazine recess 3 adapted to receive the magazine frame I4, which is provided with a rotatable cylinder magazine I5 having operating spring I5', lead pockets I6 and stops Il, as best shown in Figs. 1

and 6. A more detailed description of the magazine is set forthin mypco-pending application, Serial No. 753,174, filed November 15, 1934, and therefore requires no further description here.

The rotation of the magazine I5 serves to register the pockets I6 successively with the tip bore I2, as will be readily understood.

A reciprocating plunger I8 is mounted in a barrel I0 in registration with the lead bore I 2 and is arranged to reciprocate in the guide hole I8.

(Cl. 1Z0-18) At its other end the plunger I8 ls fixed to a. plug I9, which in turn is fixed centrally in a sleeve 20- mounted to reciprocate land rotatev freely in barrel I0. .I

The sleeve 20 is provided with a helical slot 2| which slidably engages a knobbed stud 22 carried by a spring 23 secured to the barrel I0 by the rivet 24, as shown in Fig. 1. The helical slot 'I0 is provided at its ends with enlarged openings 25. and 26 which permits the radial passage of they knob 2l of the stud 22 into and out of sleeve 20. Plug I9 is provided at its rear end with a cam 28, sleeve 20 with a groove 30, connecting openings' 25 and 26 and plunger I8 carries va compression spring I9 as shown. Bythis arrangement at'the foremost point of travel of the-plug |19 andthe 2- sleeve 20 the knob 21 is pressed'outwardlyby theA cam 28 through the opening 25, where it isfree to slide in the groove 30 to the opening26, this movement being accomplished bythe action of the compression spring `29. vIt is to be .further noted, that the stud 22 is held in interlocked engagement with the slot 2| on the forward movement and out of engagement on the return movement of the sleeve 20 by the knob 21.

'Ihe sleeve 20 is held against rotation by'a -i lug 3| slidably mounted in a groove 32 on the cap sleeve 33 as shown in Fig. 1. 'Ihis cap sleeve 33. is provided with an outwardly extending cap 34 which serves as'means for rotating the sleeve 20 and is further provided with a peripheral slot 35 into which the pin 36, secured to the barrel I0, is free to travel, thereby permitting its rotation buty preventing any longitudinal movement.

In use, upon the rotation 'of the sleeve 20 by the cap 34 when the parts are in position shown in Fig. 1, the stud 22 travels in the helical slot 2| producing a forward movement ofthe sleeve 20, the plug I9 and the plunger I8, compressing the spring 29, and forcing a lead I6 forward into the tip bore I2. At the end of the forward movement the knob 21 of the stud 22 is pressed through the opening 25 into the groove 30 thereby releasing the stud from engagement with the slot 2|l and permitting the compression spring` 29 to move the plunger mechanism rearwardly and to starting position, the spring 23 serving to return the knob 2l through the` opening 26 and thereby completing one `circle of operations.

While I have illustrated and described the preferred construction for carrying the invention into effect, these are capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details described, but

a reciprocating plunger in alignment with andv desire to avail myself of such variations and modifications as fall within the scope of the appended claims.

l. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and a reciprocating plunger in alignment with and arranged to feed leads from saidi magazine through said tip bore; rotatable means on said barrel 'for forwardly actuating said plunger in interlocked engagement; rotatable means for releasing said plunger from said forwardly actuating means; and automatic means for returning said plunger to its retracted position upon the completion of the forward stroke.

2. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and a reciprocating plunger in alignment with and arranged to feed leads from said magazine through said tip bore; rotatable means on said barrel for forwardly actuating said plunger in interlocked engagement; rotatable means for releasing said plunger from said forwardly actuating means; and spring actuated means for returning said plunger to its retracted position upon the com` pletion of the forward stroke,

3. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and arranged to feed leads from said magazine through said tip bore; rotatable means on said barrel for forwardly actuating said plunger in interlocked engagement; rotatable means for rei leasing said plunger from said forwardly actuating means; and means for slidably returning said plunger to its retracted' position upon the completion of the forward stroke.

4. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and a reciprocating plunger in alignment with and arrangedto feed leads from said magazine through said tip bore; a tubular feed sleeve connected with said plunger rotatably and slidably mounted in said barrel and having a helical slot in its walls; a stud on said barrel engaging said slot;`

and means for rotatingsaid sleeve while permitting longitudinal movement thereof.

5. A'pencil barrel; a lead magazine mounted inV said barrel; a pencil tip having a lead bore and a' reciprocating plunger in alignment with and arranged to feed leads from said magazine through said tip bore; a feed sleeve connected with said plunger loosely mounted in said barrel and having a helical slot in its Walls; enlarged openings at each end of said slot and a longitudinal groove in its periphery connecting said openings; a spring held knobbed stud on said barrel engaging said slot; and means for rotating said sleeve while permitting longitudinal movement thereof.

6. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and a reciprocating plunger in alignment with and arranged to feed leads from said magazine through said tip bore; a feed sleeve connected with said plunger loosely mounted in said barrel and having a helical slot in its walls; a stud on said barrel engaging said slot; a rotatable cap on the end of the barrel opposite its tip; a sleeve on said cap telescoping the feed sleeve and having a sliding connection therewith; and a cam on said feed sleeve operating said stud to effect reciprocaton of said plunger upon rotation of said cap.

7. A pencil barrel; a lead magazine mounted in said barrel; a pencil tip having a lead bore and a reciprocating spring held plunger in alignment with and arranged to feed leads from said magazine through said tip bore; a feed sleeve connected with said plunger loosely mounted in said barrel and having a helical slot in its walls, enlarged openings at each end of said slot and a longitudinal groove in its periphery connecting said openings, a spring held knobbed stud on said barrel engaging said slot, a rotatable cap on the'end of the barrel opposite its tip, a sleeve on said cap telescoping the vfeed sleeve and having a sliding connection therewith; and a cam on said feed sleeve operating said stud at the forward end, the movement of said feed sleeve to force said stud outwardly through the corresponding opening into said groove.

8. In a pencil, a plunger feed mechanism comprising a pencil barrel; a tubular feeding sleeve rotatably and' slidably loosely mounted.' in said barrel at one end thereof and having a helical slot in its walls; a plunger connected with said sleeve; av stud on said barrel engaging said slot; means guidably positioning said stud relative to said sleeve and slot and means for rotating said rotatably and slidably loosely mountedl in said' barrel at one end thereof and having 'a helical slot'in its walls; a plunger connected with said sleeve; a spring held stud on said barrel engag' ing said slot; meansV guidably positioning said stud relative to'said'sleeve and slot; and means for rotating said sleeve while permitting longif tudinal movement thereof.

l0. In a pencil, a plunger feed mechanism com# prising a pencil barrel; a tubular feeding sleeve rotatably and slidably loosely mounted in said barrel atone end thereof and having a. helical slot in its walls; a plunger connected with said sleeve; a spring held headed stud on said Vbarrel engaging said slot; means guidably positioning said stud relative to said sleeve and slot'; and

means for rotating said sleeve While permitting longitudinal movement thereof.

11. In a pencil, a plunger feed mechanism, comprising a pencil barrel; a feeding sleeve loosely mounted in said barrel at one end thereof and having a helical slot in its walls, enlarged openings at each end of said slot and a longitudinal groove in its periphery connecting said openings; a spring held knobbed stud on said barrel engaging said slot; a rotatable cap on said end of the barrel; a slidable connection on said cap slidably connecting said sleeve therewith; and a cam on said feed sleeve operating said stud to effect reciprocation of said plunger upon rotation of said cap.

CLARENCE F. NORLIN.

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