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Publication numberUS3116053 A
Publication typeGrant
Publication dateDec 31, 1963
Filing dateDec 19, 1961
Priority dateDec 21, 1960
Publication numberUS 3116053 A, US 3116053A, US-A-3116053, US3116053 A, US3116053A
InventorsEricsson Carl Gustaf Folke
Original AssigneeTabougnar Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Driving roller in a roller conveyor for use at high temperatures
US 3116053 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Dec. 31, 1963 c. G. F. ERICSSON muvmc ROLLER IN A ROLLER CONVEYOR FOR USE AT HIGH TEMPERATURES Filed Dec. 19. 1961 United States Patent 3,116,053 DRHVING ROLLER IN A ROLLER CONVEYOR FOR USE AT HIGH TEMPERATURES Carl Gustaf Follre Ericsson, Stuvsta, Sweden, assignor to Aktiebolaget Tabouguar, Stockholm, Sweden, a company of Sweden Filed Dec. 19, 1961, Ser. No. 160,431 Claims priority, application Sweden Dec. 21, 1960 1 Claim. (Cl. 2636) This invention relates to a driving roller employed in roller conveyors for use in furnaces with high temperatures, for example up to l300 C.

The rollers heretofore used in roller conveyors of the aforesaid type are of ceramic material or metal. The ceramic rollers comprise a cooled tubular through shaft provided with an insulating coat of ceramic material with a plurality of tubes of ceramic material of about 300 mm. length attached thereon. The material preferably convcyed on a roller conveyor of this type, for example cold rolled sheet metal, is very easily scratched by the ceramic roller.

The metallic rollers are manufactured of a hard steel alloy whereon at such high temperatures a coat, for example, of scale will adhere and accumulate in spots, thus rendering an uneven roller surface and, after hardening, scratching the sheet metal conveyed on the roller. Moreover, the metallic rollers cannot be stopped at full temperature in the furnace in view of the deformation risk, but must be kept in permanent rotation when employed in a furnace of the actual high temperature.

The aforesaid disadvantages are overcome by the driving roller according to the invention, which comprises an internally cooled tubular shaft with annular discs attached thereon, said discs being pressed so hard against one another in axial direction that a hard outer roller surface is formed. The invention is characterized in that said annular discs consist of asbestos in the form of thin and thick circular discs alternately arranged between a fixed and a movable end wall of a centre sleeve mounted by means of distance members on the tubular roller shaft, the discs being pressed together between the end walls by a compressive force produced by a hydraulic means disposed at one end of the roller shaft on a stand in such a manner that it is non-rotary, but axially displacea'ole on the roller shaft.

An embodiment of the invention will be described in the following, reference being bad to the accompanying drawings, whereof FIG. 1 is a longitudinal view of the driving roller according to the invention, partially in section, FIG. 2 is an axial view of the bellows housing in the direction of the arrows A in FIG. 1, and FIG. 3 is a cross-section of the roller along the line 13-13 in FIG. 1.

The driving roller according to the invention is comprised in a roller conveyor for use in furnaces with high temperatures. The through shafts of the rollers are mounted in special bearings outside the furnace, so that only the roller proper is placed within the furnace.

The driving roller is supported by a through shaft 1 which is open at one end and closed at the other end. For supply of cooling Water, a tube 2 of smaller diameter is introduced through the open shaft end and outside the shaft provided with a control valve. Said tube 2 terminates a distance before the closed end of the tubular shaft, and the cooling water fed in is allowed to iiow back in the tubular shaft on the outside of tube 2. In this manner, the shaft is cooled effectively without use of rotary connecting junctions at the pressure inlet which may suffer from leakage or are in permanent need of adjustment. After cooling, the cooling water is collected in a special 3,ll,@53 Patented Dec. 31, 1963 box 3 at the open shaft end and discharged through an escape pipe.

The roller body is constructed of thin and thick annular asbestos discs 5 and 6 respectively attached to a centre sleeve 9 mounted on distance members ill on the tubular shaft 1. Thanks to the location of the centre sleeve 9, an insulating air space is formed between the shaft 1 and the sleeve 9, whereby the radial specific surface stress by the asbestos discs on the centre sleeve is reduced and even the downward bending of the roller body is considerably decreased.

The asbestos discs are in alternate arrangement on the centre sleeve 9. The thinner discs 5 have a wider central opening than the thicker discs 6 and, therefore, do not reach the centre sleeve 9' but are located closer to the periphery, concentrating the axial pressure to this area. Said thinner discs 5' constitute at the same time a compensation for the shrinking of the asbestos due to the high temperature. Said shrinkage tends to increase towards the periphery because the temperature of the roller is highest there. The discs 5 are dimensioned such, that a specific axial pressure is obtained which increases radially towards the periphery of the roller. Hereby, a hard and strong tread surface is obtained which is a very important advantage of this invention, because the binding agent comprised in the asbestos tends to be destroyed at high temperatures, so that the cohesion between the natural asbestos fibres is maintained only with the help of the axial pressure.

The most important advantage of the employment of asbestos is that this material, besides its capacity of withstanding high temperatures, does not scratch the goods conveyed nor does it stick to the same.

The axial pressure is produced by a hydraulic means mounted by means of axial and radial bearings at the free end of the tubular roller shaft outside the furnace side wall. Said hydraulic means comprises two axially displaceable end walls 14a, 14b in a bellows housing 14 with a steel bellows 13 arranged therebetween. The inwardly located bellows housing end wall 14a facing the roller transfers the compressive force from the hydraulic means to the displaceable end Wall 8 of the driving roller by means of an axially displacea-ble distance sleeve 11. The outer end wall 1th of the bellows housing is biased towards the hydraulic means by stop or check nuts 12. The bellows housing is mounted non-rotary on a stand and prevented to rotate with the shaft, but may be displaced in axial direction. The length of the axial displacement depends on the length of the roller body.

The hydraulic means is operated by a conventional hydraulic pump with adjustable initial pressure. The advantage of using a hydraulic means for producing the compressive force compared with previously used spring means lies in the fact that the pressure obtained is more reliable and constant, irrespective of the displacement of the sleeve, and that a desired reduction in pressure is easier to obtain.

The driving roller according to the invention is not limited to the embodiment described and shown, but may be modified within the scope of the invention.

What I claim is:

In a roller conveyor for conveying goods, including sheet metal, strips and rods through a furnace with a high temperature (up to 1300 C.), a transport roller comprising annular members arranged on a tubular shaft, adapted for internal cooling, said annular members being axially compressible so as to present a hard roller surface to the conveyed goods, said members being rnade of asbestos in the form of alternately disposed relatively thin and relatively thick annular discs said relatively thick discs engaging by their inner peripheries a sleeve member which 3,1 1 6,0 53 i 3 4 axially surrounds said tubular shaft, said relatively thin References Cited in the file of this patent discs being formed with substantially larger central ap- UNITED STATES PATENTS ertures than said relatively thick annular discs but having the same outer diameter as the latter, said discs being dis- 2 1 9 posed between a fixed and an axially movable end Wall 5 5i hasseahom Of said sleeve member, and hydraulic means for corn- COGPJ J3 pressing said annular discs axially on said sleeve memher by exerting hydraulic force axially against said axial- FOREIGN PATENTS ly movable end wall. 434,315 Great Britain Aug. 29, 1935

Patent Citations
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US2135175 *Jul 16, 1937Nov 1, 1938John FallonRoller for conveyer furnaces
US2532448 *Mar 22, 1945Dec 5, 1950Cook Electric CoBellows
US2634964 *Jan 9, 1951Apr 14, 1953Cold Metal Products CompanyConveyer furnace
GB434315A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3315774 *Sep 16, 1965Apr 25, 1967Libbey Owens Ford Glass CoSheet supporting apparatus
US3456931 *Feb 9, 1967Jul 22, 1969Philip Carey CorpAsbestos millboard conveyor rolls for high temperature use
US3498591 *May 3, 1968Mar 3, 1970Johnson CorpSmall bore roll syphon
US3802495 *Sep 18, 1972Apr 9, 1974Combustion EngInternally fluid cooled rotatable roll
US4242782 *Jun 8, 1979Jan 6, 1981Ppg Industries, Inc.Ceramic conveyor rolls with metal end caps frictionally fixed thereto
US5205398 *Jun 27, 1991Apr 27, 1993Eltech Systems CorporationInsulating roll cover
US5355996 *Aug 2, 1993Oct 18, 1994Global Consulting, Inc.Wear resistant ceramic fiber conveyor rolls
US5362230 *Jan 19, 1994Nov 8, 1994Italimpianti Of America, Inc.Rolls for high temperature roller hearth furnaces
US5378219 *Dec 7, 1992Jan 3, 1995Global Consulting, Inc.Insulating roll cover
US5421724 *Dec 16, 1993Jun 6, 1995Italimpianti Of America, Inc.Rolls for high temperature roller hearth furnaces
US6043172 *Jan 14, 1998Mar 28, 2000Global Consulting, Inc.Ceramic fiber insulation material
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US8991216 *Nov 13, 2012Mar 31, 2015Corning IncorporatedPulling rolls with deflection limitation for use in glass manufacturing and processes incorporating the same
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US20030181302 *Mar 20, 2003Sep 25, 2003Corning IncorporatedPulling rolls for use in manufacturing sheet glass
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US20140130550 *Nov 13, 2012May 15, 2014Izhar Zahoor AhmedPulling rolls with spring elements having increased angular length for use in glass manufacturing and processes incorporating the same
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U.S. Classification432/236, 165/89, 492/40, 432/246, 193/37
International ClassificationF27D3/02, C03B35/18, B29D99/00
Cooperative ClassificationC03B35/186, C03B35/184, B29L2031/324, F27D3/026, B29D99/0035, C03B35/181, C03B35/189
European ClassificationB29D99/00E2, F27D3/02B, C03B35/18H, C03B35/18E, C03B35/18C2, C03B35/18A