US1472970A - Pencil - Google Patents

Description

H. L. FISCHER Nov. 6

v PENCIL Filed Sept. 17, 1920 Fig 1.

Patented Nov. 6, 1923.

HOWARD L. FISCHER, OF ST. PAUL, MINNESOTA, ASSIGNOR TO BROWN & BIGELOW, OF ST. PAUL, MINNESOTA, A CORPORATION OF MINNESOTA.

PENCIL.

Application filed September 17, 1920. Serial No. 410,880.

To all whom it may concern:

Be it known that I, HowARn L. Frsormn, a citizen of the United States of America, residing at St. Paul, county of Ramsey, and State of Minnesota, have invented certain new and useful Improvements in Pencils, f which .the following is a specification.

My invention relates to pencils and is more particularly adapted to a mechanical type wherein the propelling mechanism operates the marking lead into writing position: My pencil is designed to use a fine markin lead, which does not require sharpening, but has a tendency to wear so as to remain sufficiently sharp, by the user gradually rotating the pencil, while it is being used, to allow a comparatively fine line to be written with the same.

The primary object of this construction of my pencil is to provide a simple inexpensive operating mechanism, which when associated with a tubular barrel provides a magazine space for extra marking lead and does not consist of any complicated parts.

The threaded portion of the operating mechanism is fixed in the pencil casing with its forward end engaging against the conical inner surface of the writing end of the pencil while the rear portion is supported and spaced away from the barrel, this means prevents any broken particles of marking lead remaining in the pencil when the operating member of the same is removed for refilling.

In the drawings forming a part of the specification Figure 1 illustrates my encil.

Figure 2 is an enlarged longitudinal section of the same a portion of which is .broken away.

Figure 3 is a similar view to Figure 2 with the parts in a different position and illustrating portions broken away.

Figure 4 illustrates the operating member withdrawn from the mechanism .and barrel.

Figure 5 is a detail portion of the pencil.

Figure 6 is a section on the line 66 Figure 5.

Figure 7 is a perspective of the magazine closure with a portion broken away to show the interior construction.

The pencil A is made of suitable mate- 'place and still allowing rial, having a barrel. 10 with a conical forward writing end 11. The barrel or casing 10 may be of any cross sectional shape and is adapted to house the lead. propelling or mechanical operating mechanism B.

The mechanism B consists of the tubular threaded member 12, the forward end 13 of which engages against the inner conical surface 14 while .the rear end 15 is centrally supported in the casing 10 by the ring-like member 16. The member 16 is rigidly connected or secured to member 12 by solder or other suitable means and is adapted to engage the inner surface of the casing or barrel 10 and to rigidly hold the threaded member 12 in the pencil barrel. Member 16 is provided with the openings 17 through which the marking leads 18 held in the circular magazine 19 formed about the mechanism B, extend as illustrated in Figure 2.

A closure or cap 20 frictionally engages in the rear open end of casing 10 and is adapted to close the magazine compartment 19 to hold the extra marking leads 18 in thepencil while the operating member 21 is removed from the tubular member 12 to insert a new marking lead therein.

The operating member 21 is tubular and is formed with a longitudinally extending slot 22 through which the teeth 23 of the lead pusher 24 extend so as t engage the threads of the tubular member 12 when the member 21 is inserted in the member as illustrated in Figure 2.

An engaging head 25 is attached to the rear end of the operating member 21 and extends from the end of the pencil A when the operating mechanism is positioned in the same ready for use. By rotating the head 25 the mechanism B is operated to move the marking lead into or out of writing position.

A spring lock is formed in the rear end of the tube 12 by cutting a short longitudinal slit 26 in the tube and forming an annular groove 27 near the rear edge which is adapted to engage in the annular groove 28 formed in the shank of the head 25 to lock the operating member 21 in position in the pencil A with the head 25 adjacent the cap 20. This means'forms a spring catch which is suflicient to hold the operating member in it to be rotated to e lead pusher 24 is operate the pusher. T

vided between member 12 and the member 21 to irictionally hold the member 21 in the When it is desired to insert a new mark-' ing lead in the socket 29 of the pusher 24,

1c the head 25 is engaged to draw the operating member 21 out of the pencil and when the member 21 is withdrawn as illustrated in Figure 4: the old stub of the marking lead is removed from the socket 29' and a new 15 marking lead is removed from the magazine compartment 19 by removing the cap 20, then inserting the new lead in the socket 29. After refilling the socket 29 the operating member 21 with the new marking lead is in- 2 serted in the threaded member 12 until the spring catch formed on the rear of the tubular member 12 engages in the recess 28.

The pencil A involves only a small number of parts, nonepf which are of a compli- 2 cated construction yet being adapted to per;

form the functions required of a practical mechanical pencil and these features are of primary importance in my'invention.

In accordance with the patent statutes 1 30' have described the principles of operation of my encil and while I have illustrated a articu ar construction I do not wish to cone myself to the exact details illustrated but desire to protect the invention within thescope of the following claims:

I claim:

1. A encil comprising a casing, having a forwar conical end, a tubular threaded member adapted to engage the inner surface of the conical end, means adapted to rigidly hold said threaded member in said barrel and space it from said barrel in a manner to form a space for extra marking leads thereabout, a closure cap for said magazine space to the rear of said barrel and a removable rotatable operating member comprising a slotted tube and a lead pusher to move a marking lead into writing position when said operating member is rotated.

A pencil comprising a tubular barrel, a

threaded member fixed against movement in sald barrel in a manner to provide a space between said threaded member and barrel for extra marking leads, a closure cap for closing the rear end of said extra marking lead space, a lead pusher, a removable rotatable operating member adapted to longitudinallycarry said pusher.

3. A pencil including a tubular barrel, a threaded member -fixed against rotation in said barrel to provide a space for extramarking leads thereabout, a cap adapted to frictionally engage the rear end or said bar- 'rel to close the rear end of the space about said threaded member, a rotatable operating member positioned concentric in said threaded member, a threaded lead pusher carried by said operating member cooperating with said threaded member, and means for looking said operating member against longitudinal movement but free to rotate with its engaging end projecting from the rear end of said barrel, said operating means and said cap being removable separately from said barrel for the purpose specified.

4. A mechanical pencil comprising means for propelling a marking lead in either direction positioned within the pencil to provide amagazine space about the propelling means, said propelling means including a removable operating member, a threaded member, a pusher adapted to provide sprin tension between said operating member an said threaded member and locking means adapted to engage said operating member to hold it against free longitudinal movement but to allow the same to be removed when desired. 1

a 5. A mechanical pencil, comprising a barrel, a threaded member rigidly positiond and removably fixed within said barrel, an operating member adapted to rotate axially in said threaded member, a threaded lead carrier adapted to engage said threaded member carried by said operating member, a slit formed in the rear end of said threaded member, an annular groove formed intersecting said slit and an annular groove formed in said operating member adapted to be engaged by the groove formed in said threaded member 'to lock said operating member against free longitudinal movement, but allowing it to rotate to operate said lead carrier of said pencil.

HOWARD L. rrsonnn.

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