US1759220A - Leer roll - Google Patents

Description

May 20, 1930.

w. F; BROWN 1,759,220

` LEER ROLL Filed Oct. ll 1925 "'ATTURNEY Patented May 20, 1930 UNITED STATES PATNT OFFCE WILB'UR F. BROWN, OF TOLEDO, OHIO, ASSIGNOR TO LIBBEY-OWENS GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO LEER ROLL Application led October 1, 1925.

The present invention relates to sheet glass apparatus, and has particular reference to an improved type of annealing leerl and especially the rolls used therein.

YAn important object of the invention is to provide an annealing leerroll formed from a material which will not injure a sheet of heated glasseven if there is relative move,- ment between the glass and the roll.

Another object of the invention is to provide an annealing leer comprising a plurality of rolls formed from a non-corrosiveheatresisting alloy which will vnot injure the glass being annealed in any manner.

Still another object is to provide a leer roll of this nature formed from a non-corrosive inetal which is preferably made of one of the softer non-corrosive metals or alloys, thus lpermitting relative movement between the glass and the roll without injury to the surface of the glass.

Other objects and advantages of the invention will become apparent during the course of the following description.

`In the drawings wherein like numerals are employed to designate like parts throughout the same,

Fig. l is a fragmentary vertical longitudinal section through one type of glass apparatus,

Fig. 2 is a fragmentary top plan View showing one forni of leer rolls which may be used,

Fig. 3 is a longitudinal cross-section through a roll,

Fig. 4 is a transverse cross-section thereof, Fig. 5 is a sectional view of still another form.

Sheet glass is produced in a number of ways, such as by drawing a cylinder', splitting the cylinder und iattening the same into sheet form, continuously drawing a sheet from a pool of molten glass and defiecting it over a bending roll and passing it through a horizontal annealing leer, and drawing a sheet through a lslotted member known as .a dc'puter, and passing the sheet through a vertical annealing leer, and many other methods. Une type of machine is disclosed in the drawings. Fig. l being the Colburn Serial No. 59,758.

machine. This machine is provided with an annealing` leer through which the glass .sheet hein(r drawn passes, entering one end in a heated state and passingoutof the other end in a relatively cool state.'

The'leer comprises a housing in which are mounted a plurality of rotatable rolls Which support ,and convey the sheet through the leer. These so-called leer rolls are customarily formed from an asbestos composition which is not lentirely smooth and on which va high polish cannot be formed. 'The glass entering the leer is comparatively soft and susceptible to surface injury if it contacts with anything but a smooth surface. v It is almost impossible to regulate the speed of rotation of the leer rolls to give a peripheral speed the same as the speed of the sheet moving over the rolls as the sheet does not inove at the same speed throughout its entire length due to expansions and contractions in the sheet during the various stages of annealing. Because of this dili'erence in the relative speeds of the roll and the sheet, relative movement occurs betweenv the two which frequent-ly causes the asbestos roll to scratch the soft sheet.

To overcome the dilhculties and objections offered by the asbestos leer rolls, I provide a roll adapted for use in the sheet glass annealing leer which will permit relative movement between the sheet and the roll without any damage. It will be understood that-by relative n'ioveinent l mean only the small slippage between glass sheet and leer rolls which occurs because it is mechanically impractical to equalize perfectly the peripheral speed of all leer rolls with the speed of glass sheet. To produce a roll having a highly polished surface it is desirable to use a metal roll. I have found that a nickel surfaced roll will function with excellent results when used asa leer roll.

Monel is another metal which is good for thisl purpose and which produces a roll capable of having a highly polishedv surface which will not corrode when subjected to the action of the heat in the annealing' leer.

In addition to those metals which are relatively soft, the rolls can also he formed from a non-corrosive metal somewhat harder, this group including nichrome, stellite, and other similar metals. As examples of metals which practice has shown will not work, I may name copper, which scales in service, and cast iron which scales and causes bad scratches on the glass sheet.

In the drawings, in Fig. 1, is shown an fannealing' leer used in conjunction with the type of leer rolls were formed from an as-v bestos or'similar composition which frequently made characteristic leer roll scratches on the contacting side of the glass sheet,

particularly in the hot end of the leer. Such scratches are especially noticeable and objectionable when the sheet glass 1s silvered.

In Fig. 2 is shown a type of construction which can be satisfactorily. used, andl discloses the rolls 1'9 comprising a pluralityl of sections 21 whereby the rolls can be more easily handled and more cheaply manufactured.- The joints 22 between the rolls are preferably staggered as indicated toA revent the formation of lines or other sur ace defects in -the sheet passing. over theprlls. The

leer rolls externally of the leer 17 carry suitable gears 23 which may be' associated with any source of power to rotate the said rolls. The rolls may be formed from the relatively soft metal in many ways, and as shown in Figs. 3 and 4 comprise a shaft24 v on which isa cylinder 25 formedifrom the desired metal. yThe cylinder 25 is considered as a solid roll, and is formed entirely from the metal used. It is retained from the shaft4 24 andguarded against accidental displacement by means of a collar 26 and a set-screw 27. The roll 25' is smoothed off and given a high polish to present a good surface which will not injme the sheet when contacting therewith.

In Fig. 5 shown a modification wherein the shaft 29 carries a core 29 of a relatively cheap form of metal over which is arranged a skin or thin shell 30 of the noneorrosive metal. Relative movement between the shell 30 and the core 29 may be prevented by countersinking set-screws 31 as illustrated.

Instead of the single rows of rolls 19 in Fig. l, sets or pairs of rolls 43 are used inthe Fourcault machine, These rolls, like the other rolls in the past, have been formed from an asbestos or similar composition, and due tember, 1925.

to the pressure-of the rolls against sheet considerable damage has been` donewto theI 1 By forming the rolls v By constrctingthe rolls -aov f no surface damage is done to the sheet being .ni

core 29, and in view 'of this' fact'the Shell i can be made as thin aspossilile consistent with good mechanical design.Y (if course the rolls can be made. iny single lengths instead of the sections as shown in' Fig. 2, but either forni will work satisfactorily,und ivill give much better results ythanjtlie old `type of asbestos rolls. v y

It is to be understood thatthe form of the invention herewith shown. vand described isA to be taken as the preferred enlbodiment of the saine, and that various changes in the shape, size and arrangement of lparte may be resorted to withoilt departing vf"o1n the spirit of the invention outhe scope of the subjoined claims. f

Claims; i

1. In an annealing leer for. use in sheet glass apparatus, a pluralityjof sectional rolls,

the joints of the sections of thev roll being .staggered with relation to the adjacent rolls. Y 2. In an annealing .leer for Ause in sheet glass apparatus, -a plurality of sectional rolls, the ljoints of the sections being stageredwith relation -to the joints ofthe ladjacent rolls, said sections being formed from a non-corrosive metal.

3. In an annealing leer for use in sheet glass apparatus, a plurality of sectional rolls, the joints of' the sections being staggered'y with relation to the joints of adjacent rolls, j

said sections beingiorined from a relativen ly soft metal. l

Signed at Toledo, in ,the county of Lucas, and State of Ol1io,.this 28th day of Sepwiminn. F. BmiwN.

Images