US2206457A - Eraser for mechanical pencils - Google Patents

Description

July 2, 1940- A. s. DYsART 2,206,457

ERASER FOR MECHANICAL PENCILS Original Filed Aug. 26, 1938 .1 2/ *i um" NIN" 'E Si lli B a/ i. Q W ATTORNEY H SUJSBI'Z Patented July 2, 149110 I UNITED STATES PATENT OFFICE v2,206,457 ERASER Fon MEonANioAL rENorLs 4Arthur S. Dys'art, Onoville, N. Y.

Application August 26, 1938, vserial No. 227,007 Renewed November 21, 11939 'z claims. (ci. 120m-3s) This invention relates to pencils and particu Fig. 7 is a transverse sectional view taken on larly to an eraser feeding mechanism adapted plane of line E- in Fig. 6, and primarily for pencils of the mechanical type. Fig. 8 is a longitudinal sectional view of a mod- An object of the invention is to provide an adiled form of. the invention. vancing means for an eraser permitting an elonn the above mentioned drawing there have 5 gated cylindrical eraser mounted axially within beenshown several embodiments of the invention the pencil barrel to be gradually advanced outwhich are now deemed preferable, but it is to be wardly as it becomes worn, and frictionally ren vunderstood that changes and modifications may tained in any adjusted position within the body be made within the scope of the appended claims y m of the pencil. Without departing from the spirit of the inven- Another object of importance of the invention tion. is to provide a plurality of obliduely disposed Briefly, and in its preferred aspect, the invenrollers within the pencil barrel engaging the surtion may include the following principal parts: face of the eraser so that rotation of the eraser First a pencil barrel; second, an elongated cylin- 1:5 relative to the barrel will force the eraser axially drical eraser inserted within an end of the pencil l5 Within the barrel, the direction of movement bebarrel or body portion; third, a plurality of ing dependent upon the direction of rotation ol spaced oblique rollers within the pencil barrel the eraser relative to the pencil. and engaging the surface or the eraser; and

A feature that is important is that the obliquely fourth, a retainer for the rollers disposed `within disposed rollers may 'be retained in position the pencil barrel and surrounding the eraser. 'no

within openings provided therefor in a thin sleeve Referring more in detail to the gures of the tting rotatably within the barrel of the pencil. drawing there is shown a pencil body portion or AThe rollers may, however, be individually supbarrel l0 which may be of any preferred form ported with an enlarged portion of the barrel. such as a thin sleeve or tube. In an open end of With the above and other objects in view the the body portion it is inserted an eraser il which 25 invention includes the features of construction as shown is cylindrical and of substantial length. and operation set forth in the following speciiica- In vthe form of, the invention shown in Figs. l tion and illustrated in the accompanying and 2 the `pencil barrel l@ has an inner sleeve i2 drawing. closely fitting therein.A Preferably and as shown 50 In the accompanying drawing annex-ed hereto n Fig. 2 the end of the barrel lil is reduced in 30 and forming a part of this specification, I have diameter as at I3 so that its inner wall will closely shown the invention embodied in a mechanical engage the eraser for a portion of its length, encil of conventional form, but it Will be underthere being formed an annular recess within the stood that the invention can be otherwise embarrel within which the eraser advancing means t 3 bodied and that the drawing is not to be oonmay be disposed. On the outside of this reduced 35 strued as 4deiining or limiting the scope of the end 'i3 there maybe placed a removable capy of invention, the claims appended to this specificaany form (not shown) to enclose and protect the tion being relied upon for that purpose. eraser Il. Openings 9 may be cut into this re- In the drawing: ducedbarrelgportion I3 sothat the eraser il may Fig. 1 is an outside View of one end of a pencil be grasped and advanced when worn away. 4 Within which the invention may be embodied, Within the barrel Ill is mounted a thin annular Fig. 2 is a longitudinal sectional View of one sleeve I4 which may loosely surround the eraser form 0f my eraser advancing mechanism, li and be disposed between the end of inner Fig. 3 is a transverse sectional view taken on sleeve I2 and the end wall of. barrel i0 at its full 45 the plane of line 3 3 in Fig. 2. diameter. This sleeve ill as shown is held Fig. 4 is a View similar to Fig. 2 but showing against endwise movement within the barrel and a modiiied form of the invention. is provided with oblique slots l5, there being three Fig. -5 is a sectional view of the oblique rollers or four of these slots disposed equally about the within their retainer prior to insertion Within circumference of this sleeve. Small tubular roll- 50 the pencil. ers' Iii t loosely within these slots and are of Fig. 6 is a view showing a metal strip from such diameter that they are in rm contact with which the roller retaining member may be the eraser il and with the inner cylindrical surformed, one of the rollers being shown in place face of the barrel lil. In order to retain the rolltherein. ers i6 in position a retaining wire Il of spring M steel or other suitable metal may pass through the central holes of the rollers and around the sleeve I4. As shown in Fig. 2 the central portion of the sleeve M is reduced in diameter to allow ample space for the retainer wire l1 which may conform closely to the outer surface of the sleeve I4 and be held from contacting the inner surface of the barrel I0.

In Fig. 4 there is shown a slightly niodilied form of sleeve I8 replacing sleeve i4 and serving to space the rollers i6 properly about the eraser Il in the same manner by means of obliquely disposed slots therein. In this form of. sleeve however the periphery is not continuous but is interrupted by a slot extending obliquely throughout the length of the sleeve. Prior to insertion of the sleeve i8 into its position within the barrel Ill the diameter of the sleeve I8 may be extended as shown in Fig. 5. By compressing the sleeve to close the gap and form a substan-l tially complete circle the sleeve may be inserted within a barrel such as shown in Fig. 4 in which the sleeve rits Within an enlarged recess formed integrally or by a spinning operation within the barrel I9.

To make up sleeves I!! for insertion within barrels I9 in a manner permitting them to be formed in multiple lengths which may be out apart for individual sleeves I8 as needed the following may be employed. A long strip of. thin sheet metal 2Q may be slotted as shown at 2 l1 at spaced distances and at the proper oblique angle. Within the slot 2| may be placed tubular rollers 22 of the proper diameter and length to fit easily therein and function as indicated above. To retain the rollers 22 in proper position they may be mounted upon short lengths of wire 23 extending through their central holes and beyond the ends of the rollers z2. To hold the wires 23 in place which as shown are separate for each roller the longitudinal edges 24 of the strip Eil may be doubled over and crimped down upon the flat surface of the strip. mhort lengths of the strip 2B with the rollers 22 mounted therein may be cut oi and bent into lannular form substantially as indicated in Fig. 5.

In Fig. 8 there is shown a modied form of the means for supporting oblique rollers I6 in their places. In this embodiment the rollers I6 are retained individually in place by a separate supporting Wire passing centrally through each roller. The ends of each wire pass through the wall of the barrel il', which may be similar to that shown in Fig. 4, and headed over as indicated.

I claim as my invention:

1 An eraser holder for mechanical pencils comprising in combination, a barrel, a cylindrical eraser inserted therein, and rollers disposed obliquely within the barrel and frictionally engaging the eraser, whereby rotation of said eraser within said barrel will advance said eraser axially.

2. An eraser holder for mechanical pencils comprising in combination, a pencil barrel, a. cylindrical eraser inserted therein, a sleeve Within the barrel retained against axial movement, rollers disposed Within oblique slots Within said sleeve and frictionally engaging said barrel and eraser, whereby rotation of said eraser relative to said barrel will advance saideraser axially.

3. An `eraser Yholder for mechanical pencils comprising in combination, a pencil barrel, a cylindrical eraser inserted therein, a sleeve Within the barrel retained against axial movement therein and havingspaoed obliquely disposed slots in itswalls, rollers disposed within said slots and friotionally engaging the eraser and inner wall of said barrel, a wire passing through central holes of said rollers and around said sleeve to retain'said rollers in spaced relation to the eraser.

4.- An eraser holderfor pencils comprising in combination, a pencil barrel, an eraser inserted therein, obliquely disposed rollers disposed between and frictionally engaging said barrel and eraser, a retainer for said rollers comprising a thin metal sleeve, and individual wires retaining said rollers respectively within slots formed within -said sleeve.

5. An eraser holder for pencils comprising in combination, a pencil barrel, an eraser inserted therein, obliquely disposed rollers disposed between and frictionally engaging said barrel and eraser, a retainer for said rollers comprising a thin metal obliquely slotted strip having said rollers disposed and retained within said slots, said strip being bent into annular form to fit within said pencil barrel.

6. An eraser holder for mechanical pencils comprising in combination, a barrel having openings therein adjacent the eraser end, a cylindrical eraser inserted therein, and rollers disposed obliquely Within the barrel and frictionally engaging the eraser, whereby rotation of said eraser within said barrel will advance said eraser axially.

7. An eraser holder for mechanical pencils comprising in combinatioma pencil barrel having openings therein adjacent the eraser end, a cylindrical eraser inserted therein, a sleeve-Within thebarrel retained against axial movement therein and having spaced obliquely disposed slots in its walls, ro1lers disposed within said slots and frictionally engaging the eraser and inner wall of said barrel, a Wire passing through central holes of said rollers and around said sleeve to retain said rollers in spaced relation to the eraser.

ARTHUR S. DYSART.

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