US3248775A - Method of making a rubber covered roll - Google Patents

Description

y 1966 H. c. MORROW 3,248,775

METHOD OF MAKING A RUBBER COVERED ROLL Original Filed Oct. 10, 1963 B HARRY C. MORROW mflfiw fww Attorney nv VE/V TOR.

United States Patent O METHOD OF MAKING A RUBBER CQVERED ROLL Harry C. Morrow, Eethel Park, Pa., assignor to United State's Steel Corporation, a corporation of Delaware Original application Get. 10, 1963, Ser. No. 315,278, new

Patent No. 3,196,791, dated July 27, 1965. Divided and this application Feb. 5, 1965, Ser. No. 430,689

2 Claims. (Cl. 29148.4)

This application, which is a division of my co-pending application Serial No. 315,278, filed October 10, 1963, now Patent No. 3,196,701 granted July 27, 1965, relates to a method of making a rubber covered roll, particularly a slotted centering roll such as shown in Lorig Patent No. 2,592,581 dated April 15,1952. Rubber covered rolls are often used in belted conveying systems and in other locations where it may be very diflicult and expensive to remove the rolls and ship them to a rubber company for recovering. Also, it is expensive to stock spare rolls.

It is therefore an object of my invention to provide a method of making a rubber covered roll in which the rubber covering can be readily removed and replaced without the necessity of shipping the roll to a rubber company.

This and other objects will be more apparent after referring to the following specification and attached drawings, in which:

FIGURE 1 is a cross sectional view of a roll made according to the method of my invention;

FIGURE 2 is an enlarged view, partly in section, of a portion of the roll of FIGURE 1;

:FIGURE 3 is an elevation of the roll of FIGURE 1;

FIGURE 4 is a transverse fragmentary sectional view of the roll of FIGURE 1 on an enlarged scale; and

FIGURE 5 is a transverse sectional view showing a step in the manufacture of the roll.

Referring more particularly to the drawings, reference numeral 4 indicates a roll shell. A rubber covering 6 is provided over the shell 4 and as shown has a uniform outer diameter. However, the center part of the roll may have a greater diameter than its ends. A plurality of slots 8 and 10 are provided in the covering 6, the slots 8 being slanted in the opposite direction from the slots '10. In each case the slots extend from the surface of the roll toward its axis away from the transverse center of the roll in the same manner as the slots of the roll of the Lorig patent mentioned above. The s1ots'8 and 10 are preferably wider than the slots normally provided and the bottom of the slots are parallel to the axis of the roll. The rubber covering 6 has a lap joint 12 therein extending at an angle transversely across the roll. The arrangement of the joint 12 is preferably as shown in FIGURE 4 where the'arrow indicates the direction of rotation of the roll. Suitable bonding material, not shown, secures the rubber covering 6 to the roll shell 4 and also secures the ends of the rubber covering together at the joint 12. A band 14 preferably made of steel extends around the periphery of the roll within at least some of the slots 8 and 10. The band 14 bears against the bottom of its associated slot and a ho1e'16 is preferably provided at each end of the band in alignment with a hole 18 through the rubber covering 4. A screw 19 extends through the holes 16 and 18 and through a hole 20 in the steel shell 4 so as to provide additional protection against the covering slipping on the shell. Other fasteners such as bolts and studs may be used in place of the screw 19 and the term screw as used in the 3,248,775 Patented May 3, 1966 claims is intended to include such other fastening devices. If desired the ends of the band may be secured together with a strap binder of a usual type and the screws omitted. v

-In carrying out the method of my invention I provide a mandrel 22 having the same diameter as the shell 4 and a length at least as great as the shell 4. A rubber covering 24 is placed around the mandrel 22 to the desired thickness and the rubber vulcanized, after which the surface of the rubber is machined to the desired contour. The peripheral slots 8 and 10 are then provided in the rubber to a depth less than the thickness of the rubber. The steps so far described are those used in covering a roll shell when it is shipped to the rubber manufacturer. adhesive which will permit ready removal of the finished rubber covering after it has been vulcanized and machined. A slit 26 is then cut into the rubber across the full length thereof preferably at an angle of about 15. The rubber covering is then shipped to the customer who removes the old covering from its steel shell and places the new covering around the shell 4. A bonding material such as rubber cement is applied to the shell 4 and/or inner surface of the covering 6 and also to the ends of the covering formed by the slit 26. The steel bands 14 are then applied and the roll is ready for operation.

While one embodiment of my invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

I claim:

1. The method of making a rotatable roll having a preformed rubber covering surrounding a metal shell, which method comprises providing a mandrel having the same diameter as the metal shell and a length at least as long as the metal shell, placing the rubber around the mandrel to the desired thickness, vulcanizing said rubber, machining the surface of said rubber, forming peripheral slots in said rubber to a depth less than the thickness of said rubber, then removing said rubber as a unit from said mandrel, placing said removed rubber around said shell, and fastening said rubber to said shell.

2. The method of making a rotatable roll having a preformed rubber covering surrounding a metal shell, which method comprises providing a mandrel having the same diameter as the metal shell and a length at least as long as the metal shell, placing rubber around the mandrel to the desired thickness, vulcanizing said rubber, machining the surface of said rubber, forming peripheral slots in said rubber to a depth less than the thickness of said rubber, cutting a slit through said rubber at an angle transversely across the width thereof and removing said rubber as a unit from said mandrel, placing said removed rubber around said shell, and bonding it thereto, placing bands in at least some of said slots with the bands bearing against the bottom of the slots, and passing a screw through each of said bands and said rubber into said shell.

References Cited by the Examiner UNITED STATES PATENTS 2,450,727 10/1948 Haushalter 29148.4

2,592,581 4/1952 Lorig 29- 123 X 3,081,495 3/196-3 Kovatch 29-1484 X WHITMORE A. WILTZ, Primary Examiner.

The mandrel 22 may be coated with an

Claims (1)

1. THE METHOD OF MAKING A ROTATABLE ROLL HAVING A PREFORMED RUBBER COVERING SURROUNDING A METAL SHELL, WHICH METHOD COMPRISES PROVIDING A MANDREL HAVING THE SAME DIAMETER AS THE METAL SHELL AND A LENGTH AT LEAST AS LONG AS THE METAL SHELL, PLACING THE RUBBER AROUND THE MANDREL TO THE DESIRED THICKNESS, VULCANIZING SAID RUBBER, MACHING THE SURFACE OF SAID RUBBER, FORMING

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