Title:
Pencil
United States Patent 2116136


Abstract:
My invention .relates to an improvement in pencils, and more particularly to a mechanical pencil of an extremely simple type wherein only a few parts are required. A feature resides in a flexible spiral driver which is operated by the head of the pencil, and a spring locking sleeve holds the...



Inventors:
Beisang, Alfred O.
Application Number:
US9581636A
Publication Date:
05/03/1938
Filing Date:
08/13/1936
Assignee:
BROWN & BEIGELOW
Primary Class:
Other Classes:
401/77
International Classes:
B43K21/08
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Description:

My invention .relates to an improvement in pencils, and more particularly to a mechanical pencil of an extremely simple type wherein only a few parts are required. A feature resides in a flexible spiral driver which is operated by the head of the pencil, and a spring locking sleeve holds the driver in operating position.

Many pencils have been made which operate mechanically by rotating one portion of the pencil with respect to the other to expel or repel the lead. Most of these pencils, however, are provided with quite a number of parts, thus increasing the cost of manufacture. While simple mechanical pencils have been previously manufactured, most of these simple mechanical pencils omit some important function in the operation of the pencil when constructed. In other words, the simplification of the construction has been made by leaving off some of the functions of operation of the more complicated constructions.

It is the object of the present invention to provide a pencil with an outer casing which may be made of metal or non-metallic material, and wherein a lead pusher and carrier of a unique design is provided having spring bowed portions which are adapted to frictionally engage in the casing to prevent rotation of the carrier while the flexible spiral driving member is adapted to 3g be rotated to operate the spring lead carrier to propel or repel the lead in the pencil.

It is a feature of my invention that when removed from the outer pencil shell or casing, the lead propelling mechanism, if held in a vertical position, will cause the spring lead carrier to rotate to twirl from one end to the other of the spiral driving member to permit the removal or replacement of lead therein. The lead propelling mechanism comprises a tube having a helical slot therein, and a lead carrier interwoven through the spiral slot of the tube having a lead carrying end positioned axially in the tube.

The lead carrying end is provided with a slidable sleeve for engaging the lead, so that the lead moves with the lead carrier. If the tube, when removed from the outer shell of the pencil, is held vertically, the lead carrier will move downwardly in the tube, rotating as it moves.

When the lead carrier reaches its lowermost position, it extends beyond the end of the tube, where the lead may be quickly and readily removed or replaced. When a new lead has been inserted in the sleeve on the end of the lead carrier, the tube may be held with the lower end uppermost. The lead'carrier will then freely rotate to the other end of the tube, drawing the lead into the tube, before inserting the tube into the outer shell of the pencil, thus protecting the lead within the spirally slotted tube.

It is a feature of my invention to provide a lead a carrier having means thereon extending out of the tube through the helical slot and into engagement with the inner walls of the outer shell of the pencil, to provide friction to prevent rotation of the lead carrier with the tube. A spring tension is provided against the walls of the tube which is sufficient to resist rotation of the lead carrier'when the tube is rotated.

It is a further feature of my invention to provide a pencil which will not permit breaking of theleadby longitudinal pressure on the lead. The lead operating mechanism of the pencil is supported in the outer shell of the pencil by a friction means sufficient to hold the lead operating mechanism in place under ordinary writing pressures on the lead. If, however, too great a strain is placed longitudinally on the lead, the lead operating mechanism containing the lead will be forced upwardly with respect to the outer pencil shell, thus preventing the breakage of lead. This releasing means of the lead operating mechanism prevents damage to the lead as well as the operating mechanism by reason of the releasing of the spirally slotted tube when too great pressure is exerted against either the writing lead, or the lead carrier is driven to the front or writing end of the pencil and cannot be driven further.

These and other objects and novel features of my invention will be more clearly and fully set forth in the following specification and claims.

In the drawing forming a part of my specification: Figure 1 is a longitudinal section of my pencil, in enlarged form. Figure 2 is an elevation view of the outer shell or casing of my pencil.

Figure 3 is a side elevation view of the tube having the helical slot therein, mounted on the head end of the pencil. Figure 4 is a side elevation view, partially in section, of the lead actuating carrier adapted to be operated within the tube of Figure 3.

Figure 5 is a cross-sectional view on the line 5-5 of Figure 1. My pencil A is provided with an outer shell 10, tubular in shape, and tapering to a point II at the lower end thereof. To the shell 10 is attached a pocket clip 12, having a pocket engaging rounded end 13 supported by a spring arm 14. Attaching flanges IS extend through holes in the shell I1, and are clinched over on the inside lof the shell II at II, to hold the clip 12 in proper position.

The lead operating mechanism of the pencil A is mounted upon a pencil head 17. The head 17 is of substantially the same diameter as the shell 10, and is concentric with the shell I . The upper extremity of the head 11 is hollowed out at 18 to accommodate the eraser I1. The lower portion 20 of the head IT fits within the shell 10, and Is of slightly smaller diameter than the inside of the shell 10. An annular groove 22 is formed in the lower portion 20 of the head IT, intermediate the ends of the lower portion 20.

A split spring ring 23 is mounted in the annular groove 22. This ring is normally of slightly larger diameter than the inner diameter of the shell 10, but is formed of spring material, and readily contracts slightly upon pressure to slide within the shell 10. The outer surface of the ring 23 is tapered as shown at 24, to permit this ring to slide readily into the end of the shell 10. The head 17 is accordingly held in the upper end of the shell 10 under spring tension, the ring 23 impeding longitudinal movement of the head 17 with respect to the shell 10. As the ring 23 rotates readily within the groove 22, the rotary movement is not impaired by the friction ring 23. The lower portion 20 of the head 17 is longitudinally drilled to accommodate the end of a tubular member 25. The tube 25 is wedged into the drilled opening, so that the tube 25 will rotate as an integral part of the head II. The tube 25 is formed of a strip wound in helical form, providing a helical slot or groove 26 between successive convolutions. The tube 25 extends to a point near the lower tapered end II of the shell 10, and preferably contacts the inner wall of the tapered portion to hold the tube in proper position within the shell 10.

A spring wire lead carrier 27 is provided within the tube 25 for actuating the lead. A sleeve 28 having a slot 29 in one side thereof surrounds, and extends beyond, the lower end of this lead carrier 27. A projection 30 on the lead carrier 27 near the lower end thereof extends through this slot 29, and holds the sleeve slidable on the lower end of the lead carrier 27. A second projection 32 on the lead carrier 27 limits the sliding movement of the sleeve 28, permitting the sleeve to slide until the lead carrier extends from one end to the other of the sleeve.

The lead carrier 27 is bent at substantially right angles to the axis thereof to provide an arm 33 extending through the slot 26 in the tube 25.

The lead carrier 27 is then bent to provide a slightly bowed spring portion 34 engageable with the inner wall of the outer shell 10. An arm 35 at substantially right angles to the axis of the lead carrier extends through the slot 26 at a point spaced above the arm 33, entering the tube 25. An axially aligned portion 36 extends to a point adjacent the arm 33, where an arm 37 extends through the slot 26 in a direction opposite to that of the arm 33. The arm 37 supports a spring bowed portion 38, which engages the inner wall of the shell 10 on the side thereof opposite the engagement of the portion 34 of the lead carrier, balancing the engagement of the lead carrier in the shell or casing 1 of the pencil.

It will be seen that the formation of the lead carrier 27 is such as to provide a pair of resiliently supported portions 34 and 38 frictionally engaging the inner wall of the shell IS under spring tension. The long longitudinal engagement will resist the tendency for the lead carrier 27 to rotate with the tube 2S. The lead carrier 27 is much more resistant to rotary movement than to longitudinal movement, making it a comparatively simple matter for the lead carrier to move longitudinally when the tube 25 is rotated.

The operation of the pencil is believed clear from the description. The lead is fed through the lead opening 31 in the point II of the tapered portion of the pencil by rotating the head 17 in one direction. The rotation of the head 17 acts to rotate the tube 25. Rotation of the tube 25 moves the plunger downwardly in the shell 10, the edge of the slot 26 engaging the arms 33, 35 and 37, and acting as a cam to urge the lead carrier 27 downwardly. The lead carrier 27 is kept from rotation by the engagement of the portions 34 and 38 of the lead carrier against the inner wall of the shell 10.

When the lead carrier moves sufficiently, the lower end of the sleeve 28 engages the inner tapered wall of the shell. Further movement of the lead carrier 27 downwardly will move the lead carrier relative to the sleeve 28 until the sleeve 28 is entirely,disengaged from the lead 40 of the pencil.

The angle of the groove 26 in the tube 25 is such that when the tube 25 is removed from the shell 10, the plunger will move toward one end or the other of the tube when the tube 25 is held vertically. The weight of the lead carrier 27 is sufficient to cause the same to freely twirl downwardly in the slot 26. Thus, after a new lead has been inserted in the sleeve 28, the tube may be held vertically with the head 17 down, and the lead carrier will move toward the head until the lead is entirely enclosed within the tube 25, or virtually so. As the friction of the sleeve or ring 23 is all that holds the lead operating mechanism in the shell 10, it may be seen that abnormal longitudinal pressure on the lead will act to force the ring out of the shell 1(, thus preventing the breakage of lead when too great a longitudinal pressure is exerted against the same. It will also be noted that the lead operating mechanism may at any time be withdrawn from the shell 10 by a longitudinal pull on the head 17. go In accordance with the patent statutes I have described the principles of operation of my pencil; and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that this is only illustrative of a means of 65 carrying out my invention, and that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim: 1. A pencil comprising an outer casing, a head engageable in one end of said casing for rotation, a tapered writing end on the other end of said casing, a tubular spirally slotted member extending into said casing and secured to said head to be operated by the same, and a spring wire lead carrier formed from a single piece of wire having a lead carrying end extending axially in said slotted tube and an axially disposed portion spaced from the lead carrier end and having oppositely disposed spring arms for engaging in the casing to prevent rotation of the lead carrier but permitting longitudinal sliding of the same in the casing when the spirally slotted tubular member is operated by said head. 2. A pencil comprising an outer shell having a writing end formed on one end thereof, a cylindrical opening in the other end thereof, and a lead operating mechanism including a head adapted to support an eraser to close said opening, a collar portion formed on said head having an annular recess, a spring collar freely disposed in said recess, a spirally slotted flexible tube secured axially in said collar portion of said head and extending into the major portion of the writing tip of said casing, and a spring lead carrier interwoven into the spiral slots of said tube having axially disposed portions with a lead carrying sleeve on one of said portions, and oppositely disposed spring shell engaging portions.

3. A pencil comprising an outer shell or casing, a head rotatably mounted on one end thereof, a tubular member secured to said head for rotation thereby, a helical slot formed in said tubular member, a spring lead carrier having portions axially disposed in said tubular member, and spring arm portions extending through said slot from said axial portions and adapted to engage with said shell to prevent rotation of said lead carrier, and a slidable lead receiving socket on one of said axially disposed portions of said lead carrier.

4. A pencil comprising an outer shell having a cylindrical inner wall surface, a tubular member rotatably mounted in said shell, said tubular member having a helical slot, a member for supporting a writing lead axially within said tubular member, means on said lead carrier engageable with said slot, and spring arm means on said lead carrier engageable with the cylindrical surface of said inner wall of said shell to prevent rotation of said plunger with respect to said shell.

5. A pencil comprising an outer shell, a tubular member rotatably mounted in said shell, a helical slot formed in said tubular member, a unitary spring lead carrier having portions extending longitudinally within said tubular mem4 ber, and spring arms formed on said lead carrier extending through said slot inro resilient engagement with the inner wall of said shell at oppositely disposed points.

6. A pencil including an outer casing, a flexible tubular helically slotted rotatably mounted member extending approximately through said entire outer casing axially disposed therein, a unitary lead operating spring wire member hav- ( ing axially disposed portions extending longitudinally in said tubular member, and a plurality of spring arm portions slidable and longitudinally engageable at angularly spaced points with the inner portion of said casing to prevent rotation of said lead carrier, and a slidable lead socket supported on the front end of said lead carrier.

7. A pencil including an outer casing, a tubular helical guide rotatably mounted in said shell casing, a lead carrier in said guide, means on said lead carrier extending through said helical guide at different points and provided with spring means for engaging said casing under spring tension to prevent rotation and to permit longitudinal sliding of said lead carrier in said casing, and a lead receiving sleeve slidably secured to said lead carrier, whereby said lead carrier may be operated by said helical guide when said guide is rotated to propel and repel a lead in said pencil. 8. A pencil including a writing tip, a lead propelling and carrying means including an operating head, a rotatable locking sleeve, a helically slotted tubular member secured to said head, and a spring wire lead carrier having a slidable lead receiving socket thereon, said lead carrier having spaced apart axially disposed and longitudinally extending portions for guiding said carrier, and spring means connecting said axially disposed portions for engaging within the casing to hold the lead carrier against the rotation.

9. A pencil having a removable lead propelling mechanism, a casing for receiving said mechanism, said mechanism including a spirally slotted tubular member, a spring wire lead carrier having longitudinally disposed spaced apart portions axially disposed within said tubular member, slightly bowed spring arm portions diametrically oppositely disposed, and a slidable lead socket carried on one of said axially disposed portions of said lead carrier.

ALFRED O. BEISANG.