US 3249092 A
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Description (OCR text may contain errors)
L. G. MOOJEN May 3, 1966 CRAYON S Filed Feb. 17, 1964 FIG.3.
United States Patent 3,249,092 CRAYONS Lindsay G. Mooien, Holly Cottage, Smithy Green, Woodley, (Iheshire, England Filed Feb. 17, 1964, Ser. No. 345,492. 2 Claims. (Cl. 120-13) This invention relates to crayons, oil pastels, chalks, pencils, paints and other similar writing, painting and drawing materials, all hereinafter referred to simply as crayons for the sake of convenience.
These crayons are normally readily breakable and it is customary to enclose them in a protective sheath, conveniently a paper tube. The tube may be torn back as the crayon is used or the crayon may be pushed out of the tube as required, but in the latter case means must be provided to prevent the crayon returning into the tube under writing pressure. My British Patents Nos. 905,472 and 912,519 describe and claim various stop means embedded in the butt of the crayon with tongues which dig into the tube wall preventing return movement of the crayon. Such arrangements function quite satisfactorily but owing to the configuration of the stop means they tend to impede the flow of wax during the direct casting of the crayon material into the tubes.
An object of the present invention is to provide an improved crayon in which the stop means configuration reduces the obstruction to flow of the material into the tube.
According to the invention, there is provided a crayon which is slidable within a protective tube having embedded therein a continuous resilient strip at least one of the free ends of which is adapted to dig into the wall of the tube to prevent the crayon receding under writing pressure but allowing the crayon to be advanced as it is worn away, the strip also being shaped such that substantially onlya single run of the strip extends across the bore of the tube.
The strip may be flattened or round and the strip preferably is U or V shaped. The U- or V-shaped strip may have equal or unequal legs. As a further alternative the strip may be L-shaped. It will be seen that these shapes have only one run which extends across the tube as far away from the filling entrance to the tube as possible, consistent with the strip size and the obstruction to the fiow of the molten wax during direct casting into the tubes is minimized. Additionally, the absence of any re-entrant angles allows an inserting plunger to enter into the shape and to push the strip into the tube and to withdraw in te same plane leaving the strip behind. There is the substantial additional advantage that once a strip is inserted into the tube its resilience holds it in place and enables subsequent handling of the tube without special precautions.
Ernbodiments of the invention will now be described,
by way of example, with reference to the accompanying drawing, in which:
FIGURE 1 is a part-sectional perspective view of a crayon, in accordance with the invention,
FIGURES 2, 3 and 4 are perspective views of alternative shaped strips.
Referring to FIGURE 1 there is shown a crayon comprising a paper tube 1 enclosing and supporting a stick 2 of writing wax which is sharpened at the writing end 3 and at the butt end 4 has embedded therein a U-shaped resilient strip 5 of metal, the ends 6 of which are cut at an angle and turned out so that they dig into the inside surface of the tube 1 when pressure is applied to the stick 2 during writing. The ends 6 do not, however, prevent the stick from being advanced as the end 3 is worn away.
FIGURE 2 shows a V-shaped strip and FIGURE 3 shows a U-shaped strip having legs of unequal lengths. The shorter limb in FIGURE 3 may have its free end turned out, if desired. As a further alternative a substantialiy L-shaped strip, as shown in FIGURE 4 may be used, the limb 8 being arranged to extend across the tube.
What is claimed is: V
1. A crayon comprising an elongated tube open at both ends, said tube containing crayon material providing a writing element projecting from one end of said tube and terminating inwardly of the opposite end of said tube, stop means for preventing movement of said element toward said opposite end and permitting movement of said element toward said one end, said stop means comprising a resilient generally U-shaped strip embedded in the material of said element and with the ends of the legs of said strip disposed outwardly of the end of said element adjacent said opposite end of said tube, said strip being free of reentrant angles and having only a single bend therein between said ends of said legs to provide a connecting portion between said legs, each of said ends of said legs being inclined in a radial and axial direction toward said opposite end and engaging the inner surface of said tube, whereby said ends will penetrate said tube and prevent movement of said element toward said opposite end while permitting movement of said element toward said one end. v
2. A crayon as defined in claim 1 in which said single bend is in the form of a relatively sharp V.
References Cited by the Examiner UNITED STATES PATENTS 1,637,545 8/1927 Bosworth -49 FOREIGN PATENTS 905,472 9/1962 Great Britain.
912,519 12/ 1962 Great Britain.
5 LAWRENCE CHARLES, Primary Examiner.
EUGENE R. CAPOZIO, Examiner.