US3615063A

US3615063A - Plastic core for paper rolls

Info

Publication number: US3615063A
Application number: US33270A
Authority: US
Inventors: Dana B Bates
Original assignee: Simpson Timber Co
Current assignee: Simpson Timber Co
Priority date: 1970-04-30
Filing date: 1970-04-30
Publication date: 1971-10-26
Anticipated expiration: 1988-10-26

Abstract

A PLASTIC CORE FOR ROLLS OF PAPER HAVING A GENERALLY CIRCULAR FLAT BASE PORTION WITH A CIRCULAR HOLE CENTRALLY LOCATED THEREIN AND FURTHER INCLUDING A PLURALITY OF UPSTANDING WALLS ON THE SAME SIDE OF THE BASE MEMBER, ONE WALL IMMEDIATELY ADJACENT THE CENTRALLY LOCATED HOLE AND ANOTHER OF THE WALLS BEING SLIGHTLY SPACED FROM THE OUTER PERIPHERY OF THE BASE MEMBER. THE CORE FURTHER INCLUDES A PLURALITY OF WEBS HAVING A TAPERED CONFIGURATION EXTENDING BETWEEN THE WALLS AND PROTRUDING UPWARDLY THEREFROM AND A PLURALITY OF REINFORCING MEMBERS INTEGRALLY MOLDED WITH AND EXTENDING FROM THE OUTER SIDES OF THE OUTERMOST WALL AND THE BASE MEMBER, EXTENDING ONLY AS FAR AS THE OUTER CIRCUMFERENCE OF SAID BASE MEMBER.

Description

Oct. 26, 1971 D. B. BATES PLASTIC GORE FOR PAPER ROLLS Filed April 30, 1970 FIG 3 FIG, 2

INVENTOR. DANA B. BATES ATTORNE YS United States Patent 3,615,063 PLASTIC CORE FOR PAPER ROLLS Dana B. Bates, Kirkland, Wash., assignor to Simpson Timber Company, Seattle, Wash. Filed Apr. 30, 1970, Ser. No. 33,270 Int. Cl. B65h 75/18 US. Cl. 242-6845 Claims ABSTRACT OF THE DISCLOSURE A plastic core for rolls of paper having a generally circular flat base portion with a circular hole centrally located therein and further including a plurality of upstanding walls on the same side of the base member, one wall immediately adjacent the centrally located hole and another of the walls being slightly spaced from the outer periphery of the base member. The core further includes a plurality of webs having a tapered configuration extending between the walls and protruding upwardly therefrom and a plurality of reinforcing members integrally molded with and extending from the outer sides of the outermost Wall and the base member, extending only as far as the outer circumference of said base member.

BACKGROUND OF THE INVENTION This invention is directed to a new and improved core member for paper spools, the core being adapted to accommodate rolls not having an integral reinforcing core and designed to be self-securing once placed within the roll of paper.

In the past, the plug or core member which has been used in paper rolls, not having integral core members, has generally comprised of a wooden plug which is wedged into the end of the paper roll, the plug having a centrally located hole therein for mounting upon a spindle. The disadvantage of the wooden plug has been firstly, the expense involved in the plug itself and secondly, the fact that the wedging within the paper roll was not always secure enough to provide a core member which would not accidentally dislodge. Dislodgement often was the result of the slight variation in the interior diameter of the paper roll or the variation in sizes of the paper plug depending upon the moisture content and the like.

With the above noted problems in mind, it is an object of the present invention to provide a one-piece molded plastic core member for use in paper rolls wherein the size of the core member is substantially constant, and further has sufficient strength and integral wedging members to provide a relatively permanent core member once inserted in position.

In accordance with this object and as a feature of the present invention, there is a one-piece molded plastic core member having as an integral part thereof, wedging members which provide sufficient frictional contact with the interior of the paper core to prevent the accidental dislodgement of the core member.

Further, in accordance with the above noted object and as a feature of the present invention, there is provided a plastic core member having reinforcing web members which serve a secondary function of providing an aligning as well as wedging means when the core is being inserted into the paper roll.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the plastic paper core member;

FIG. 2 is a plan view of the core member of FIG. 1;

FIG. 3 is a side elevation of the core member of FIG. 1;

FIG. 4 is a sectional View of the core member along lines 4-4 of FIG. 2; and

Patented Oct. 26, 1971 FIG. 5 is an enlarged elevational view of the core membger showing the specific shape imparted to the web memers.

DETAILED DESCRIPTION OF THE DRAWINGS Reference being had to the accompanying drawings, it can be seen that the plastic core member generally denoted as 2 comprises a base portion 4 of generally flat circular configuration having a centrally located hole 6, an upper surface 8 and a lower surface 10. Extending from the upper surface 8 of the base member 4 is a first wall 12 integral with the base member and immediately adjacent the centrally located hole 6. The interior portion of the cylindrical wall 12 has a plurality of longitudinal outwardly extending ribs 14 for purposes later to be described.

Adjacent to the outer circumference of the base 4 is a second upstanding cylindrical wall 16. Since the upwardly extending wall 16 is slightly spaced from the outer circumference of the base 4, there, exists a flange 18 extending outwardly from the Wall 16. Integrally molded with the paper plug member are a plurality of reinforcing elements 20 which extend perpendicularly upwardly from the flange 18, forming a broken cylindrical surface and then taper inwardly to terminate at the outer surface of the wall 16.

Extending between the

walls

12 and 16 are a plurality of web members 22 which extend from the base member 4 linking the two

walls

12 and 16. The webs 22 extend upwardly beyond said walls in a rounded V-shaped configuration forming a means for guiding the plug into the interior hole of the paper roll.

Referring now specifically to FIG. 5, it can be seen that the web members 22 while having a generally V-shaped configuration, likewise taper upwardly from the base portion in the perpendicular direction wherein the thickest portion is at the base denoted by A in the figure and the thinnest portion is denoted by B and is at the uppermost end of the web 22.

Inwardly extending ridges 14 within the interior of the wall 12 provide a slightly frictional contact with the spindle introducing a slight drag to prevent an absolutely free run. Further, since the webs taper upwardly in both dimensions, they serve as a guide for the core during insertion into the paper roll as noted above and also pro vide a wedging action. The upper portion of the web is the thinnest and is the first to contact the paper roll forming a path which will of necessity become of greater width as the core is forced into the paper roll. The core is inserted until it is flush with the end of the paper roll and the widest part of the web denoted as A will be the portion which is frictionally contacting the interior of the paper roll. It is to be noted that the plurality of reinforcing elements 20 likewise taper upwardly such that when the core is being forced into the interior of the paper roll, they likewise will be wedged within the roll and provide frictional contact. The large area of frictional contact as Well as the wedging action assures relative permanency of the core within the paper roll as well as providing the necessary strength for rigidly holding the roll in position once mounted upon the spindle.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A molded plastic plug for use in the core of a roll of paper comprising;

a generally circular flat base member having a hole centrally located therein,

spaced cylindrical walls extending from the same surface of the base member, one of said walls located immediately adjacent to the hole and another of said 3 4 walls adjacent to but slightly spaced from the outer and outermost walls and extending upwardly from the circumference of said base member, and base. 7 a plurality of radial upwardly extending webs span- 5. A plug as in claim 1 wherein the webs are thinner ning the area between the cylindrical walls, extending at their uppermost portion than at the base portion and beyond the top of said walls and radially outwardly 5 extend to the outer circumference of the base member. to the outer circumference of said base member,

whereby the Webs provide guidance when inserting the References Cited plug as well as serving as reinforcing elements for UNITED STATES PATENTS v t d the innermost wall which 1s adapted to be moun e 1,222,943 4/1917 G t 24 a spmdle' 1889139 11/1932 Bebie 242 68 6 2 1 1 f 1 1- A p ug as 1n c aim 1 and urther including a p ura 3,260,362 7/1966 S e 242 68'6 X ity of inwardly extending ridges on the interior of the innermost cylindrical wall.

3. A plug as in claim 1 and further including a plural- STANLEY GILBREATH Pnmary Examiner ity of reinforcing elements exterior to and integral said 15 G. A. WALTERS, Assistant Examiner outermost wall and terminating at the outer circumference of and integral with the base member. US. Cl. X.R.

4. A plug as in claim 1 wherein the webs are of gen- 20659 R erally an inverted V-shape integral with the innermost