US3187409A

US3187409A - Method of securing resilient material covers to a roll

Info

Publication number: US3187409A
Application number: US278643A
Authority: US
Inventors: Walter L Glass
Original assignee: AMES AMERICAN CO
Current assignee: AMES AMERICAN Co
Priority date: 1963-05-07
Filing date: 1963-05-07
Publication date: 1965-06-08
Anticipated expiration: 1982-06-08

Description

W. L. GLASS June 8, 1965 METHOD OF SECURING RESILIENT MATERIAL COVERS TO A ROLL Filed May '7, 1963 INVENTOR Ma. lass United States Patent() 3,187,409 METHOD OF SECURING RESILIENT MATERIAL COVERS T A ROLL Walter L. Glass, Claverack, N .Y. Ames American Co., Box 606, Columbus, Miss.) Filed May 7, 1963, Ser. No. 278,643 Claims. (Cl. 29--148.4)

This invention relates to a method of securing covers on articles, and more particularly to a method of rigidly securing a cover of resilient material on a rigid core member. Y

In many industries, including the paper, textile and steel industries, where the material produced or processed is in a continuous web form, such material usually is guided, conveyed or fed by means of cylindrical metal rolls. Often such rolls are provided with a rubber sleeve or cover mounted on the outside cylindrical surface of a core member which is journaled in suitable support means.

' In the prior art there are many types of rolls having covers of resilient material which utilize various methods for attaching the cover material to the cylindrical surface of' the core member. Generally, the resilient material, usually rubber, is attached to the metal core member by bonding, molding, with the use of threaded fasteners or rivets or, most commonly, by merely relying upon the shrinking action of the resilient material which provides the most economical method of attaching. However, in vthe use of such latter method of attaching, itl has been found that such covers are apt to slip relative to the core members on which they are mounted, when the web material, is fed at high speeds. This occurrence is particularly troublesome in rubber covered vacuum rolls generally comprising a cylindrical Vmetal core member having an axial bore and a plurality of radial openings com- 'rnunicating with the bore, and a rubber cover mounted onthe outside cylindrical surface of the core member, having a plurality of openings in registry With the Vopenings in the core member. The axial bore of the core member is usually closed at one end and the opposite end thereof is connected to a suitable suction source such as a vacuum pump. Under normal operating conditions when suction is applied to the bore of the roll, the web material in contact with the roll is held firmly against the cylindrical surface thereof. It further has been found, however, that when the speed of the continuous web is increased to high speeds, the rubber cover often slips, causing the registered suction apertures to move out of alignment, thereby either eliminating or decreasing the effective gripping action of the roll.

It is, therefore, the principal object of this inventionto provide' an improved method of securing a cover of resilient material on an article.

Another object of this invention is tov provide an improved method of rigidly securing a cover of resilient material on the core member of a roll.

Another object of this invention is to provide an improvedv method of attaching a cover of resilient material on the core member of a roll.

A further object'of this invention is to provide an inexpensive and simple method of attaching a'cover of resilient material on the core member of a roll.

Further objects and advantages of the present invention willbecomeapparent as the following description proceeds, when taken in conjunction with the drawings which accompany and form a part of the specification wherein:

FIGURE 1 is a top planview of a preferredl embodiment of the present invention,having portion thereof broken away; y FIGURE 2 is a cross-sectional view taken along line 2-2 of FIGURE l; and

Patented June 8, 1965 lCC FIGURE 3 is a cross-sectional View taken along line 3 3 in FIGURE 2.

In accordance with Vthe broad aspects of the present invention, there is provided a roll suitable for use With continuous web material generally comprising a core member having a cover of resilient material mounted thereon in gripping relation.V The covered surface of the core member is provided with at least one recess beneath the cover defining a chamber having a pressure less than the pressure on the outside surface of the cover, whereby the differential pressure across that portion of the cover overlying the recess causes such portion to be drawn into the recess to rigidly secure the cover to the core member. Broadly, the novel method of attaching the cover to the core member consists of forming the recess in the surface of the core member to be covered, heating the core member to expand the gases in the recess, mounting the cover on the core member in overlying relation with the recess so that when the core member cools, the gases in the chamber defined by the recess and the portion of the cover overlying the recess, contract to provide a partial vacuum. With the contraction of the gases in such chamber, the portion of the cover overlying the recess is drawn into the recess, thereby providing a vacuum lock to rigidly secure the cover to the core member.

Referring to the drawings, there is shown a preferred embodiment of the invention, including a cylindrical metal core member 10 having an axial bore 11 anda sleeve or cylindrical cover member 12 of a resilient material, preferably rubber, mounted on the outside cylindrical surface of the core member. The inside diameter of the cover member is slightly less than the outside diameter of the core member, so that when the cover member is mounted on the core member, it will grip the core member to prevent relative slippage between the cover and the core member as is conventional practice in the art. The core member is provided with a plurality of radially extending through passageways 13, communicating with the axial bore of the core member and the exterior thereof. The through passageways 13 preferablyrare circumferentially and axially spaced to Vprovide a uniform distribution thereof on the cylindrical surface 14 of the core member. Also provided on the cylindrical covered surface 14 and interspersed betweenthe through passageways 13 is a plurality of radiallyV disposed drilled openings 15 having closed bottoms. The pressure in the drilled openings 15 is less than the pressure on the cover member, so that those portions 16 of the cover member overlying the drilled openings 15 are Vdrawn into the openings, thereby providinga'vacuum lock for the cover member. As best shown in FIGURES 2 and 3, the cover 12 is provided with a plurality of openings 17, arranged so as to register with the through openings 13 to form suction apertures. i

The ends of the core member 10 are providedV with closure members 18 and 19 mounted on

suitable journals

20 and 21, respectively. The end journal20 is provided with an axial bore 21 communicating with the axial bore Y in the core member and adapted to be connected to a vacuum source such as a suction pump.

The roll, as illustrated in the drawings, is made by firstk forming the through passageways in a piece of suitable tubular bar stock having a substantiallyV thick wall to provide the core member. The openings 15 are then drilled in the outside kcylindrical surface of the core member interspersed between the through openings 13. The core member is then heated to a temperature sufficient to cause the gases in the drilled openings 15 to expand, yet insuflicient to alter significantly the chemical or physical properties of the cover member 1,3` to be mounted thereon. VWhen the core member is formed of bronze and the cover of rubber, a temperature of 300 F. has been found suitable for this purpose. While the cover member is still heated and the gases in the openings 15 are expanded, the cover member 12 is then mounted on the core member so that the through openings 17 therein are in registry with the through openings 13 of the core member. The core member is then permitted to cool, whereby the contracting gascs in the drilled openings 15 cause those portions of the cover overlying such openings to be drawn therein, as best shown in FIGURE 3, to provide a vacuum lock, thus rigidly securing the cover to the core member.

During operation of the roll at high speeds, the cover member will be rigidly secured to the core member, whereby the through openings 13 in the core member and the through openings 17 in the cover will remain in registry, thus permitting the maximum amount of suction to be applied to the continuous web material in contact with the outside surface of the cover member. It will be appreciated that relative movement between the cover and the core member is prevented by means of the combined action of the inherent gripping action of the cover, the vacuum lock provided by the partial vacuums created in the drilled openings 15, and those portions 16 of the cover member extending partly into the drilled openings.

From the foregoing detailed description, it will be evident that there are a number of changes, adaptations and modications of the present invention which come within the province of those skilled in the art. However, it is intended that all such variations not departing from the spirit of the invention be considered as within the scope thereof as limited solely by the appended claims.

What I claim is:

1. A method of attaching a cover of resilient material on the core member of a roll comprising forming at least one recess in said core member, heating said core member to temperature suicient to expand the gases in said recess, mounting said cover on said core member in overlying relation with said recess while said roll is yheated and cooling said core mem-ber whereby at least a partial vacuum is provided in the closed chamber defined by said recess and the portion of said cover overlying said recess to vacuum lock said cover to said core member.

2. A method of attaching a cover of resilient material on a cylindrical metal core member of a roll comprising forming a plurality of recesses on the outside cylindrical surface of said core member, heating said core member to a temperature sufficient to expand the gases in said recesses yet insufficient to alter the chemical or physical properties of said cover material, mounting said cover on said heated core member in overlying relation with said recesses and cooling said core member whereby the contracting gases within the closed chambers defined by said recesses and those cover portions overlying said recesses provide at least a partial vacuum therein so that said overlying cover portions are drawn into said recesses thereby locking said cover to said core member.

3. A method of attaching a rubber cover on a cylindrical bronze core member of a roll comprising drilling a plurality of holes having closed bottoms in the outside cylindrical surface of said core member, heating the core member to about 300 F. to expand the gases in said recesses, mounting said cover on said heated core member so that portions of said cover overlie said holes and cooling said core member whereby the contracting gases within the closed chambers defined by said holes and said overlying cover portions produce at least a partial vacuum therein so that said overlying cover portions are drawn into said holes thereby locking said cover to said core member.

4. A method of attaching a cover of resilient material on a cylindrical metal core member of a roll having an axial bore and a plurality of radial openings in the outside cylindrical surface thereof communicating with said bore, wherein said cover is provided with a plurality of openings adapted to register with said openings in said core member when the cover is mounted on said core member comprising forming a plurality of recesses on the outside cylindrical surface of said core member, interspersed between said through openings in said core member, heating said core member to a temperature suiiicient to expand the gases in said recesses yet insuicient to alter the chemical or physical properties of said cover material, mounting said cover on said heated core member so that the openings in said cover register with the through openings in said core member and portions of said cover overlie said recesses and cooling said core member whereby the contracting gases within the closed chambers defined by said recesses and said overlying cover portions produce at least a partial vacuum therein so that said overlying cover portions are drawn into said recesses thereby locking said cover to said core member.

5. A method of attaching a rubber cover on a cylindrical bronze core member of a roll having an axial bore and a plurality of radial openings in the outside cylindrical surface thereof communicating with said bore, wherein said cover is provided with a plurality of openings adapted to register with said openings in said core member when said cover is mounted on said core member comprising drilling a plurality of radial extending holes having closed bottoms in the outside cylindrical surface of said core member interspersed between said through openings in said core member, heating said core member to about 300 F. to expand the gases in said holes, mounting said cover on said heated core member so that the openings in said cover register with the through openings in said core member and portions of said cover overlie said radial holes and cooling said core member whereby the contracting gases within the closed chambers defined by said said radial holes and said overlying cover porf tions produce at least a partial vacuum therein so that said overlying cover portions are drawn into said radial holes thereby locking said cover to said core member.

References Cited by the Examiner UNITED STATES PATENTS 2,292,851 8/42 Tykal 226-191 2,293,794- 8/42 Bell et al 29-148.4 2,450,727 10/48 Haushalter 29-148.4 2,566,439 9/51 Wieman 29-121 2,804,300 8/57 Bilane 226-191 3,035,331 5/62 VVieman 29-l48.4 X

WHITMORE A-. WILTZ, Primary Examiner.

RAPHAEL M. LUPO, THOMAS H. EAGER,

, Examiners.

Claims

1. A METHOD OF ATTACHING A COVER OF RESILIENT MATERIAL ON THE CORE MEMBER OF A ROLL COMPRISING FORMING AT LEAST ONE RECESS IN SAID CORE MEMBER, HEATING SAID CORE MEMBER TO TEMPERATURE SUFFICIENT TO EXPAND THE GASES IN SAID RECESS, MOUNTING SAID COVER ON SAID CORE MEMBER IN OVERLYING RELATION WITH SAID RECESS WHILE SAID ROLL IS HEATED AND COOLING SAID CORE MEMBER WHEREBY AT LEAST A PARTIAL VACUUM IS PROVIDED IN THE CLOSED CHAMBER DEFINED BY SAID RECESS AND THE PORTION OF SAID COVER OVERLYING SAID RECESS TO VACUUM LOCK SAID COVER TO SAID CORE MEMBER.