US2242458A - Pencil sharpener - Google Patents

Description

May 20, 1941. G. DESSONNAZ PENCIL SHARPENER Filed March 29, 1940 c-v 2688077199 i -M 4 .Patente d. May 20, 19%! tea I rnivorn smmrnunn ,Georges Dessonnaz, Fribonrg, Switzerland, assignor of one-half to Roger de Werra, e.

Switzerland Application Manna, 1940, Serial No. 326,771

In Switzerland April. a, 1939 ..5Claims.

I The present invention relates to a pencil sharpener and has for its object to provide improved means for sharpening leads of pencils.

The invention also consists in the further features hereinafter described and set forth in the dependent claims, reference being had to the accompanying drawing which illustrates, by way of example, two embodiments thereof and wherein:

Fig. 1 is an elevation and Fig. 2 a plan view "showing the first embodiment of the invention,

while Fig. 3 represents a sectional view taken on the line 33 in Fig. 2. Fig. 4 is an elevation accordingto the second embodiment of the invention, and Fig. 5 shows a sectional view taken on the line 5-5 in Fig. 4. Thepencil sharpener according to the Figs. 1 to 3 comprises a support formed to include a body I and a base 2 made for instance of aluminium plate and shaped by means of a sheet metal pressing machine. The body I is constructed of two hollow cylinders 3 and 4 of different diameter and connectedto each other by a shoulder 5, the cylinder 3 being partly closed at its top by an end wall 6 having a central aperture I formed by an inwardly projecting border 8 of said wall.

means of the device l3; then it is introduced into the socket l5, whereby the said lead projects through the bore of the coniform bottom of said socket to get into contact with the abrading surface ll .of the ring l3. Then, a circular movement is imparted to thepencll (see Fig. 2) while turning the same between the fingers,

whereby the socket l5 guided by the projection The base 2 is shown having a lower cylindrical portion 9, a shoulder It, a cylindrical portion H, and a tapered central projection l2 extending axially into the body I.

Between the shoulder 5 of the body I and the base 2 is clamped a circular ring I3 of casehardened steel, said ring being slightly tapered as shown and affording internally a knurled or abrading surface Id.

Within the cylinder 3 of the body I is disposed a socket is extending through the aperture 1 of said cylinder and being adapted to receive the pencil P to be sharpened. The top of said socket is formed to provide a ball and socket joint l6 which is somewhat larger in diameter than the aperture 7 so as to rest onthe border 8 forming said aperture. The bottom of the socket is coniform and presents a central bore providing a passage for the lead of the pencil P. The socket presents further on its middle portion an outer collar H which is slightly spaced apart from said ball and socket joint.

The base 2 is provided with a lateral opening l8 housing any known cutting device l9 adapted to cut or point the wooden shafts of pencils.

The above described pencil sharpener is to be used in the following way:

The pencil. P is first placed into the aperture It to relieve the lead from the wooden shaft by I! of the base 2' partakes of said movement and follows the circumference of a cone in such a way as to hold the lead of the pencil in permanent ring l3. Owing to the friction produced on the said surface, the lead is quickly sharpened and thereby assumes a tapered form. It will be suflicient to revolve the pencil a few times to give its lead of whatever shape a perfectly sharpened form.

The collar I'I cooperates with the border 8 of the aperture 1 so as to prevent the socket I5 from being intempestively withdrawn from the body l as long as the said body and the base 2 are maintained assembled.

The pencil sharpener illustrated in Figs. 4 and 5 comprises a body 2| made of mould material such as Bakelite or the like; this body which may be in the form of a hollow cylinder is pref erably cut with facets at its outer surface and affords at its bottom a screw thread 23 adapted to engage a threaded base 24 which may be made of the same material as the body 2!.

The body 3i presents at its top a central aperture 25 formed by an inwardly projecting border 26 of said body; it is also provided with an inner flange 21 as shown in Fig. 5. Through the aperture 25 extends a socket 28 which is of the same I construction as the socket l5 of the embodiment first described. Between the base 25 and the flange 2'! is inserted a tapered ring 23 not different from the ring I3 previously described. Moreover, the base 24 and the said ring 23 clamp between each other a member of aluminium plate constructed to form a flange 30 and a tapered central projection 3! extending axially into the body 2i, said member being adapted to constitute a guide for the socket 28 to which a circular movement may be imparted in the above described manner.

The base 24 also houses a cutting device 32 of the known type, adapted to cut the wood of pencils before sharpening the leads of the latter. I claim: e

1. Pencil sharpener, in combination a support, an abrading conical surface within said support,

a guide member disposed concentrically to thelongitudinal axis of said surface, and a ball and socket joint carried by said support above said formed of a hollow cylinder and a base detach-H ably assembled to each other, said cylinder having at its top a central aperture forming a seat. a tapered ring disposed concentrically in said cylinder and affording an abrading inner surface coaxial with said aperture, a guide member disposed concentrically to the longitudinal axis of said surface, and a ball and socket joint resting on the seat of said cylinder above said surface, said joint being diametrically perforated to engage a pencil and being capable of oscillatory motion about a point of saidaxis so as to revolve said pencil around said guide member while bringing the lead into contact with the abradin surface for sharpening said lead the'reon upon revolving said pencil.

3. Pencil sharpener, in combination a support formed of a hollow cylinder and a base detach-v ably assembled to each other, said cylinder being provided with a lateral shoulder and having at its top a central aperture forming a seat, a tapered ring disposed concentrically in said cylinder, said ring being clamped between said base and the lateral shoulder of said cylinder and affording an abrading inner surface coaxial with said aperture, a guide member formed integral with said base and projecting therefrom concentrically to the longitudinal axis of said surface, and a ball and socket joint resting on the seat of said cylinder above said surface, said joint being diametrically perforated to engage a pencil and bein capable of oscillatory motion about a point of said axis so as to revolve'sald pencil around said guide member while bringing the lead into contact with the abrading surface for sharpening said lead thereon upon revolving said pencil.

4. Pencil sharpener, in combination a support formed of a hollow cylinder and a base detachably assembled to -each other, said cylinder being provided with a lateral shoulder and having at its top a central aperture forming a seat, a tapered ring disposed concentrically in said cylinder, said ring being clamped between said base and the lateral shoulder of said cylinder and affording an abrading inner surface coaxial with said aperture, a guide member formed integral with said base and proiecting'therefrom concentrically to the longitudinal axis of said surface.

the same in a determined position with respect to the tapered ring, and said joint being capable of oscillatory motionabout a point of said axis so as to revolve said pencil around said guide member while bringing the lead into contact with the abrading surface for sharpening said lead thereon upon revolving said pencil.

5. Pencil sharpener according to claim 4, said socket presenting an outer collar capable of seating against the border of the central aperture of the cylinder so as to prevent said socket from being intempestively withdrawn from the support as long as the cylinder and the, base are maintained assembled.

GEORGES DESSONNAZ.

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