CA1189733A - Lagging product and method for belt pulleys, processing rolls and the like - Google Patents
Lagging product and method for belt pulleys, processing rolls and the likeInfo
- Publication number
- CA1189733A CA1189733A CA000381451A CA381451A CA1189733A CA 1189733 A CA1189733 A CA 1189733A CA 000381451 A CA000381451 A CA 000381451A CA 381451 A CA381451 A CA 381451A CA 1189733 A CA1189733 A CA 1189733A
- Authority
- CA
- Canada
- Prior art keywords
- wall
- sheet
- lagging
- pulley
- elastomeric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
- F16H55/38—Means or measures for increasing adhesion
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A lagging member for the peripheral wall of a belt pulley, processing roll or the like which comprises a laminated structure made up of a thin flexible non-extensible sheet; flex flexible lagging material bonded to the normally outer side of the sheet; a layer of flexible elastomeric material bonded to the normally underside of the sheet; and means for fastening circumferentially spaced edges of the member peri-pherally to the pulley/roll wall with the elastomeric layer wrapped in torsional stress-supporting mating engagement therewith. In one form of the invention, there is incorporated at the normally circumferentially spaced edges of the member heavier, weldable weight, metal which is adapted for welding to the pulley/roll wall.
A lagging member for the peripheral wall of a belt pulley, processing roll or the like which comprises a laminated structure made up of a thin flexible non-extensible sheet; flex flexible lagging material bonded to the normally outer side of the sheet; a layer of flexible elastomeric material bonded to the normally underside of the sheet; and means for fastening circumferentially spaced edges of the member peri-pherally to the pulley/roll wall with the elastomeric layer wrapped in torsional stress-supporting mating engagement therewith. In one form of the invention, there is incorporated at the normally circumferentially spaced edges of the member heavier, weldable weight, metal which is adapted for welding to the pulley/roll wall.
Description
1 LAGGING MEMBER AND METHOD FOR BELT PULLEYS, P~OCESSING ROLLS AND THE LIKE
by ~II,LIAM G. ~OLZ
The invention relates to what is commonly referred to as pulley lagging, i.e., an elastomeric tread product which is supplied to the peripheral surfaces of belt pulleys, processing rolls and the like for the purpose of improving belt traction/ to increase belt life by eliminating slippage, and to promote belt alignmentO The product is equally applicable to conveyor belt idler rolls and many types of rollers used in industry as processing or driving rolls.
~CKGROUN~ ART
Rubber lagging is most commonly applied to steel pulleys~ rollers and the like by rubber companies having special eqwipment for this purpose. When the lagging is wornr it is normal practice to remove the rolls from service and send them to a rubber roll covering facility for renewal. This may require temporary shut-down of the user's production line and is otherwise both costly and time consuming.
Some years ago applicant evolved a system for applying lagging to pulleys which had the advantage of being applied in the field as desired by the user~ This system involved the manufacture by a rubber company and , ~
by ~II,LIAM G. ~OLZ
The invention relates to what is commonly referred to as pulley lagging, i.e., an elastomeric tread product which is supplied to the peripheral surfaces of belt pulleys, processing rolls and the like for the purpose of improving belt traction/ to increase belt life by eliminating slippage, and to promote belt alignmentO The product is equally applicable to conveyor belt idler rolls and many types of rollers used in industry as processing or driving rolls.
~CKGROUN~ ART
Rubber lagging is most commonly applied to steel pulleys~ rollers and the like by rubber companies having special eqwipment for this purpose. When the lagging is wornr it is normal practice to remove the rolls from service and send them to a rubber roll covering facility for renewal. This may require temporary shut-down of the user's production line and is otherwise both costly and time consuming.
Some years ago applicant evolved a system for applying lagging to pulleys which had the advantage of being applied in the field as desired by the user~ This system involved the manufacture by a rubber company and , ~
-2~ 33 1 supplyiny through trade channels to the ultimate user, of arcuately formed steel backing plates on which the rubber lagging i6 bonded. The units have a preformed curvature to rest upon and mate with the roll periphery to which they are applied, e.g.~ rolls of designated diameters. The structure referred to is illustrated in U.S. Patent Mo.
3,354,735 wherein the backing plates are designed for mounting in guide and retaining m.embers which are welded or otherwise fastened to the pulley face. This particular structure has the advantage of being applied and renewed as required by the user. Somewhat similar techniques for using lagging sections of preformed curvatures which are bolted to the face of the pulley are illustrated in U.S.
Patent Nos. 2,707,403 and 3,010,332.
One of the disadvantages of lagging products heretofore available is that moisture, sand and other abrasive particles will work themselves under the metal plates and corrode and abrade away the metal plate support for the product. In khe case of Patent No. 3,354,735, the retainer strips are of necessity fixed, as by welding to the pulley periphery, thus minimizing Elexibility in the positioning of the lagging sections on the pulley and almost inevitably resulting in an imbalanced condition Also some relative movement is inherent between the lagging 2~ sections and the retaining strips and the roll periphery which results in wear and abrasion and premature failure of the parts.
Attempts have also been made to prefor~ a full circle endless tire which is intended to be driven upon the 3~ periphery of only one corresponding diameter wheel. This technique re~uires the manufacture of specified sizes for each wheel diameterO Examples of such proposals can be found in U.S. Patent Nos. lr636,492, 1,765,402, 2,369,635, 2,673,469, 2,701,937, 2,778,234, and 3,3181165a For certain limited usages, fabric reinforced belting has been used for lagging. The practice is to cut the belting into a relatively narrow width strip which is -3~ ~ 3~
1 then spirally wound on the pulley with an adhesive, covering l00~ and fastening at various poinks and at the opposite end~ of the belting strip. This type of lagginy is subject to stretchin~ and premature failure and is essentially unidirectional in its operation, i.e., in the direction of tiyhtening of the belting strip on the roll.
Moreover, there is a disadvantage in having to work with cements and glues needed and universally used in the application of the belting strip. The application of adhesives is costly, messy and difficult, particularly over wide temperature and humidity ranges.
DISCLQSURE OF INV~NTIQN
The lagging member of the present invention is a bonded integral laminated structure comprising an interior sheet of flexible non-extensible material, a relatively thick layer of elastomeric lagging material on the normally outer side of the sheet and a relatively thin coating or laminae of elastomeric, rubber-like, material on the normally underside of the sheet. The laminated sandwich structure is flexible and may be readily wrapped on the outer surface or wall of the pulley or roll. The circumferentially spaced ends of the member are fastened to the roll periphery with the ru~ber-like coatiny at the underside of the member in frictional engagement with the periphery. This rubber undercoating prevents slippage and movement between the member and the roll; prevents corrosion and abrasive wear, seals against moi~ture and foreign materials entering between the pulley and lagging member, improves contact of the lagging member with irregular roll surfaces, facilitates the contouring of the product to the curvature of the roll and prevents kinking or sharp bending of the interior non~extensible sheet. The function of the intermediate sheet is to provide a no-stretch or yield laminate, preventing distortion ormovement o~ the assembly while turningl such as wave build-up action ahead of the point of work load and to .
7~
1 cooperatively support the fastening of the member to the pulley. The third, outer ply or layer is designed for contacting the work and may be of a multitude of designs and compositions depending on the operation involved, e.g., pulley lagging, lumber feeding, rice hulling, food processing, etc.
An object of the present invention is to provide a lagging product which can be reliably and economicaliy produced in a flat state without necessity of pre-contouring and which may be simply cut by the user tolengths to fit various pulley or roll diameters or leng~hs, and which may be easily and readly applied on site at the user's place with ordinary skill and available shop equipment. As a result, the user only need keep one size of lagging in stock for applying lagging to all of user's pulleys, processing rolls and the like in the plant, thus eliminating the need for keeping on hand a great variety oE
sizes and shapes of preformed lagging to fit pulleys and rolls of different sizes.
Another object of the present invention is to provide a lagging product and applying method which is flexible in enabling the selective coverage of the pulley or roll to the peripheral area required.
A further object of the present invention is to provide for the most easy and effective attaching of the lagging member to the pulley surface by weldiny which no~
only affords rapid and effective attachment but insures, on the ensuing cooling and contraction of the intermediate bonded sheet, the drawing of the rubber undercoating into tight fitting gripping relation on the pulley periphery.
The invention possesses other objects and features of advantage, some of which of the foregoing will be set forth in the following description of the peferred form of the invention which is illustrated in the drawings accompanying and forming part of this specification. It is to be understood, however, that variations in the showing made by the said ~rawings and description may be adopted _5~ 9733 1 within the scope of the invention as set forth in the claims.
EEI~E_rES~BIPTION OF THE ~
FIGURE l is a plan elevaticn of a lagying product constructed in accordance with the present invention.
FIGURE 2 is an enlarged plan elevation similar to Figure l but showing a portion only of the product.
FIGURE 3 is a cross-sectional view taken substantially along the plane of line 3-3 of Figure 2~
FIGURE 4 is a Eurther enlarged cross-sectional view of the product taken substantially on the plane of line 4-4 of Figure 2.
FIGURE 5 is a side elevational view of a pulley with the lagging product of the present invention applied thereto.
FIGURE 6 is a cross-sectional view of a portion of the product and pulley showing means of attachment.
FIGURE 7 is a cross-section view similar to Figure 6 but showing an alternate means of attachment.
FIGURE 8 is a fragmentary perspective view of a modified form of the lagging product.
FIGURE 9 is an elevationa1 view of a pulley/roll having another form of lagging product of the present invention applied thereto, FIGURE l0 is an enlarged fragmentary cross-sectional view taken substantially on the plane of line of l0-l0 of Figure l.
FIGURE ll is a plan view of the structure illustrated in Figure 2 as sugyested by the lines ll-ll of Figure l0.
FIGURE 12 is an elevational view of a pulley/roll having applied thereto a further modified form of the lagging material.
FIGURE 13 is an enlarged fragmentary cross-sectional view taken substantially on the plane of line 13-13 of Figure 120 ~, -G~ ~ 7 ~ 3 1 FIG~RE 14 is a plan view of the structure illustratecl in Fiyure 13 as indicated by lines 14-14 of Figure 13.
FIGURE 15 is a cross-sectional view of a further modified form of the present invention.
FIGURE 16 is a plan view of a portion of the member shown in Figure 15,as indicated by lines 16-16 on Figure 15.
~EST MO~ OF C~R~L~O~ r~Y~L~l9L
The lagging member 6 of the present invention is designed for applying to the peripheral wall 7 of a belt pulley 10, processing roll or the like, and comprises briefly a thin flexible non-extensible sheet 9; a layer 1~ flexible lagging material 12 bonded to the normally outer side of sheet 9; and a coating 13 of relatively soft rubber or other similar elastomeric material bonded to the normally underside of sheet S; and means 28 for fastening the lagging member peripherally to the outer peripheral surface 16 of wa]l 7 with the elastomeric layer 13 wrapped in torsional stress supporting, mating, engagement with the surface.
In accordance with the present invention, and as a principal feature thereof, lagging member 6 is most conveniently and economically molded in a rubber plant flat, in planar, integrally bonded, laminatedr form which may be furnished to industrial users who may cut the members to sizes for wrapping around and fastening to the exterior suriace of belt pulleys, processing rolls~ and the like. In its preferred form, the interior non-extensible sheet 9 is composed oE lightweight sheet metal which will afford adequate tensile strength while yet being sufficiently flexible for wrapping upon the periphery of the pulley wall in close conformity thereto. Sheet steel of up to about 1.6 m~m. thicknes has been found satisfactory for the wide range of applications to which the product has been tested~ The laminated structure 7 ~ 73~3 l comprises a relatively thick layer of lagging material 12 which is basically an elastomeric tread-like material which is bonded to the normally outer sicle of sheet ll and a relatively thin coating or laminae of elastomeric raaterial 5 13 bonded to the normally underside of sheet ll~ The whole product is thus quite flexible and may be readily wrapped upon the circular periphery of the pulley/roll. It has been found that the lightweight metal insert will support the fastening means, the sheer stresses to which the product is subjected, and provide dimensional stability;
while the elastomeric undercoating 13 provides torsional grip, relieving the load on the fastening means and only requiring the latter to hold the rubber undercoating in snug frictional engagement with the pulley/roll wall 7.
As a principal feature of the present invention, the lagging member may be readily applied to the circular pulley/roll wall by simply wrapping the member on the wall and merely fastening the circumferentially spaced ends 17 and 18 of the lagging member. Any convenient form of ~ pinning, staplingl rivetting or welding of such ends may be used, it being noted that the essential function of such fastening is to secure the lagging member in a circumferential embrace on the pulley/roll wall. ~he elastomeric undercoating 13 will provide torsional grip and cofunction with fastening means 28 to carry the load.
One of the discoveries of the present invention is that the forces to which the lagging is subjected in use, as in the driving of a conveyor belt or the like, are primarily shear Eorces and that the pressure exerted by the belt upon the lagging, which is backed up by the pulley wall, retains the lagging in pressuri~ed contact with the pulley wall. I have found that this resistance to shear is readily obtained by the combination of the non-extensible ; member insert 9 and the bonding thereof to the inner and outer laminas 12 and 13. As above noted, difEerent elastomeric materials may be used in the two laminas 12 and 13, the only requirement being that the elastomeric ' ~
''3~3;~
1 materials be bonded to the interior reinforcirlg ~heet 9.
~or most purposes elastomeric material having a durometer of about 50 to 60 shore A may be used for the laminas.
Member 9 is preferably formed of sheet metal of about 16 to 28 gauge, so as to afford adequate tensile strength while yet being sufficiently flexible for wrapping upon the periphery of the pulley wall in close conformity theretoO Other non-metallic materials may be used having requisite non-extensible strength, bondability to the elastomeric product, and flexibility for wrapping onto the periphery of the belt pulley or roll. Suggested for such use are non-extensible plastics such as phenolics, epoxy resin reinforced with fiberglass, polycarbonates, polyester resins, resins made from urea and formaldehyde, ABS
(acrylonitrile butadine styrene) and Rrealstic (TM~.
Member 9 is disposed within the body of the elastomeric product offset from the center plane near the underside 11 thereof so as to provide the above described three~ply laminate structure, viz. a relatively thick outer lagging ; 20 section 12, lamina 9 and a relatively thin bottom section 13 enyaging the pulley wall 7. The elastomeric material making up laminas 12 and 13 may be the same, or they may be readily seleted for best performance under different individual applications. Preferably the rubber material in section 13 is relatively soft so as to provide a high coefficient of friction in its contact with pulley wall 7 and prevention of movement of the lagging product while in service, and at the same time providing for optimum contact with the wall in conforming to minor irregularities, protecting the metal insert against corrosion and abrasion, and preventing entry of materials between the lagging and the pulley, an important protection in food processing operations. At the same time the bottom rubber lamina 13 permanently bonded to the underside of the metal sheet, helps to prevent kinking or creasing of the metal when bending to conform to smaller diameter pulley surfaces. I
have found that this thin rubber backing in combination '3733 1 with the non-extensible sheet, so long as applied in intimate contact with the pulley/roll wall, and without further compression, will positively lock the lagging product against slippage on the pulley/wall surEace.
In the form of the invention illwstrated in Figures 1-4, the lagging member is molded of a width designed for side-by side placement of a multiplicity of strips along the lengthwise dimension of pulley wall 7, as seen in Figure 5, with the length of the strip extending circumferentially of wall 7. The molded strip may be conveniently made in relatively narrow widths, say 5-10 centimeters, and of any convenient manufacturing length such as 300 to 1,000 centimeters or more. The product thus dimensioned may be conveniently furnished to the user in flat length or coiled form. The user will then cut off from the supplied length of material a piece which has a length corresponding to the circumference o the roll to be covered.
In the application of the lagging product to the pulley, it has been found that due to the il~herent frictional characteristics of the rubber backing, difficulty may be experienced in obtaining a circumferentially straight alignment of the lagging strips in tight, full face contact with the pulley wall. As pressure is applied to the lagging to obtain a tight contact, the rubber backing acts to prevent movement and retains the assembly in position as first placed. In order to obtain 100% contact between the lagging and pulley surfaces, some adjustment of positioning of the lagging on ~he pulley is highly desired if not required. Any deviations of the length of the lagging from a cross-sectional plane perpendicular to the axis of the pulley will result in a void at one edge of the lagging due to each edge of the lagging contacting the pulley at different radii. In order to facilitate ~he proper precise mountiny of the lagging product on the pulley face, I apply to the contacting surfaces a volatile liquid lu~ricant which :Lo~ 3~
1 permits adjustment of the position of the lagging into a precision Eit. Water, preferably with a wetting agent is satisfactory, e.g., a 15% alcohol solution. As a feature of the present inventionl the bottom lamina 13 is formed with a plurality of longitudinally spaced transversely extendin~ grooves 16 deEining longitudinally spaced transversely extending pulley wall engaging lands 17 with open passageways therebetween for discharging of the lubricant applied to the wall and the underside of the lagging and expressed from the lands 17 upon securing of the lag~ing product to the wall.
In the form of the invention illustrated in Figures 1-4, the user will cut a length of lagging to correspond with the circumference of the pulley wall to be covered. The liquid volatile lubricant will then be applied ether to the wall or the underside of the member and the strip laid circumferentially on the wall and adjusted to its exact position and with its opposite ends 21 and 22 brought into opposed relation as seen in Figure 6~ Preferably a banding means 23, see Figure 5, is applied to the strip for circumferentially compressing the strip on the pulley wall so as to obtain 10~% face-to-face contact.
In this operation, excess lubricant will be squeezed into the grooves 16. A standard strapping tool may be used such as Band-It ~TM), Punch-Lock (TM) or chain-type vice grip.
Tightening of the clamp is effected while the lagging is movable and lubricated. The pattern of grooves 16 and lands 17 also provide a series of sharped edged squeegy contacts which further enhance the gripping ability of an otherwise smooth rubber backing to the pulley surface.
Additionally~ it has been found advantageous to apply to the peripheral surface o~ the pulley/roll, a coating for protecting the surface against rust and corrosion and also to improve the frictional grip of the elastomeric layer 13. A latex-type paint such as used for undercoating on automotive vehicles is very satisfactory.
A neoprene water solutioll as sold by Neoprene International ~ 3 1 Corporation, Glen Ellyn, Illinois/ is an excellent material for this use, The latex-base paint sets up hard~
s~bstantially tack-free, seals the pulley/roll surface against rust and corrosion, and cofunctions with the rubber backing to securely hold the lagging member in place.
A6 a feature of the present invention, the strip width of the lagging product is confined to a manageable width for precise mounting on a pulley wall and for full-face intimate contact against the pulley wall by the clamp member 23. At the same time the relatively narrow width of the lagging strip permits the ready disposition of a plurality of strips across the longitudinal dimension of the pulley as seen in Figure 5. The user may thus readily select the amount of pulley surface to be covered. In many instances it is only necessary to cover 60 to 70% of the pulley surfaces. Circumferential grooves around the finished pulley may thus be easily provided for taking away water, mud or other products being transported by a belt entrained around the lagging; and one or more of such grooves may also be used as a guiding channel for a V-belt or the like.
; Securement of the lagging strips is here effected by fastening the opposite ends 21 and 22 of the lagying strip to the pulley wall or to each other as seen in Figures 5, 6 and 7. Thi.s may be done by means pinning the opposite ends 26 and 27 of member 9 to the pulley wall 7 or to each other by riveting, stapling, bolting or welding.
As seen in Figure 6, the outer lagging lamina 12 is cut back to expose the opposite ends 26 and 27 o member 9 and these ends may then be ~onveniently pinned by rivets 28 to the pulley wall as illustratedO They may also be pinned down by spot welding to the wall with the same result.
Another form of fastening o~ the lagging is illustrated in Figure 7, where the opposite ends 26a and 27a of ~ember 9a are brought into overlapping position and pinned together by one or more rivets 28a. Here again, the overlapping ends 26a and 27a could be suitably crimped or spot welded -12~ 97~3 1 together. The width of the surrounding clamping band 23 may be substantially less than the width o the elastomeric strip, as seen in Figure 5, and still provide full compressive holding of the strip to the pulley wall.
Accordi~gly, ample room is left on opposite sides of the band for placement of rivets 28 or for spot-welding or the like~ Where riveting is used, the internal reinforcing member 9 eliminates fastener pull~through problems.
A modified form of the invention is illustrated in Figure 8 of the drawings, wherein the product is composed of a broad, flat sheet 31 of flexible elastomeric material and a plurality of flat~ elongated, thin, flexible metal or other non-extensible members 9a mounted in substantially co-planar, parallel, laterally spaced apart and longitudinally coterminous position in a mid~plane of sheet 31 and bonded integrally thereto so as to provide a relatively thicls outer lagging section 12a and a relatively thin protective and wall gripping undercoating 13aO The latter as in the first described embodiment is formed with a plurality of longitudinally spaced, transversely extending grooves 16a for discharge of above described lubricant/adhesive; although the use of a lubricant is not as critical in this form of the invention. As an important feature of this construction, the sheet is readily severable between the members 9a to provide a plurality of elastomeric strips similar to strip 8 hereinabove described, that is of a width designed for side-by-side placement of a multiplicity of such strips along the lengthwise dimension of the pulley wall, the strips being severable transversely to desired length for wrapping upon and securing to the pulley wall with the length of the strip extending circumferentially of the wall as hereinabove explained, The product as illustrated in Fiyure 8 may be economically produced in large sheets in a 3~ molding press. Lateral`spacing between the reinforcing members 9a permits readily slicing of the elastomeric material between the members to provide the desired ~, ~3~ 33 1 longitudinal strips. To facilitate the slicing of the sheets into the individual strips, the outer, thick, elastomeric section 12a may he formed with a plurality of longitudinally extending slits 32 which are aligned longitudially with the spaces between members 9a and extend midway into the outer section 12a to make easy and precise the cutting through of the elastomeric material.
Various tread-like suraces may be molded into the outer side of lagging section 8 to provide a rubber-like tread, non-slip characteristics, and to facilitate processing operations, e.g. rice hulling, lumber feed rolls, nut processing, sheet steel conveying, etc~ Lorig-type grooves may be similarly provided. Since the strip is applied to the pulley or roll in a circumferential plane perpendicular to the axis of rotation, the lagging is bi-directional enabling the pulley or roll to be driven in either of its opposite directions with equal effect and performance, Another advantage of the present lagging is the ease in which step crowning of the pulley may be accomplished to improve belt training by simply applying to the pulley over the central section thereof one or more lagging strips of greater thickness than the strip~ applied to the opposite end portions of the pulleyO A step crowned pulley will have about 60% of the center section raised, and about 20~ at each end of the pulley lowered, the step ranging about 1.6 mm or more.
As a special feature of the forms o-E the invention shown in Figures 9-16 the fastening of the circumferentially spaced edges ~-lb and 22b may be easily and effectively accomplished by welding these ends to the pulley/roll periphery where the latter is of conventional steel construction. Welding apparatus and experience is ~ most commonly available in industrial plants which will ; 35 make use oE the lagging product and will many times be the fastening means of choice There is another and important advantage in welding the ends of the lagging product to the 7~l~
1 pulley/roll periphery in that the welding process, as a by-productl produces a heating and expansion of the metal at the time of attachment and thus provides upon ensuing cooling and contraction a tightening of the elastomeric laminate 13 onto the peripheral pulley/roll surface 16.
While the welding of the lagging member ends may frequently be the attachment of choice, the internal stabilizing sheet 11 is required to be only of a light gauge, as above explained, and in its preferred form is too light for normal weldingO Accordingly, and as a further feature of the present invention, separate members 31 and 32 of weldable weight metal are mounted at the circumferentially spaced edges 21b and 22b. In the forms of the invention shown in Figures 1-6, these members comprise channels having opposed side walls 43 and 44 and connecting wall 45 which may be mounted in surrounding relation to ends 21b and 22b so as to tightly grip within each channel the bonded laminate comprising sheet 9b and at least some elastomeric product on opposite sides thereof.
Thus the channel members provide a complete and effective seal for the circumferentially spaced edges of the lagging product, protecting the interior metal sheet against rustr corrosion or other deterioration. To enhance this Eeaturer channels 31 and 32 are preferably formed of stainless steelO
In the application of the lagging member to the pulley/roll, the lagging member is cut to a length corresponding to the circumference of the pulley/roll. The relatively thick lagging 12b is preferably reduced in thickness adjacent ends 21b and 22b, using an appropriate cutting tool, so as to provide an overall thickness which will it snugly within channels 31 and 32. The channels may then be clamped onto the ends by any suitable means.
Indenting or deforming one or both of channel walls 43 and 44 will accomplish the desired purpose. This may be done with a simple indenting punch, the results of which will be noted in the drawings where one side of each of the -lS~ ~ 7~3 1 channels is jointly deformed with the interior ~heet 9b into one of the adjacent laminae, here laminae 13b.
The lagging member formed as above may then be wrapped around the pulley/roll periphery as above described. A bead of welding material 46 may then be placed at the confronting ends of the channels and the pulley/roll surface 16. The lagging member ends may be brought quite close together as here shown or may be somewhat further apart and separately welded as suits the convenience of the user. Spacing between the confronting edges will be typically up to about one centimeter or more.
A further modified form of the invention is illustrated in Figures 12-14 wherein the lagging member 6c is especially formed for mounting longitudinally of pulley~roll 7c. In this case the integrally molded laminated structure comprises the same interior ~etal sheet 9c, relatively thick outer layer 12c of lagging material and relatively thin interior layer llc of elastomeric material, the product being molded flat in any desired ~ convenient and economical length. Since the circumferen-tially spaced edges 17a and 18a will extend along the longitudinal sides of the molded strip, these sides may readily be molded to provide margins of reduced thickness of the lagging material 12c so as to provide preformed edge sections which will fit within channels 21a and 22a. The latter may be secured to these margins by indenting or otherwise as hereinabove explained. In the application of this form of the invention, the lagginy material is cut to a length corresponding with the axial length or face width of the pulley/roll. I have found it convenient to weld one of the longitudinally extending channels to the peripheral wall 7c of the pulley/roll with the welded edge and weld beads 46a extending parallel to the axis of the pulley/roll. The product will tend to stand off tangentially from surface 7c but is sufficiently flexible to readily flex into wrapping relation around surface 16a by the use of any simple banding of holding tool. The ~.
-16~ 33 1 oppo~ite edge channel may then be welded to surface 7c to fasten the lagging in place. Additional lagging members may be similar]y fastened to the pulley/roll periphery, covering such portion of the circumference as desired. By accurate spacing of the lagging members, more perfect balance can be achieved, as contrasted to prior art lagging.
A further modified form of the invention is illustrated in Figures 15 and 16 wherein the lagging member 6d is especially formed for mounting longitudinally of the pulley/roll similar to the embodiment of Figures 12-14. In this case the circumferentially spaced edges 17b and 18b will extend along the longitudinal sides of ~he member and thus readily accommodate within the mold, extra pieces 31a and 32a of heavier gauge, weldable weight, sheet metal. In accordance with the present invention, these members are first cut in strips having a length equal to the length of the interior metal sheet 7d, and the strips 31a and 32a are positioned upon and tack-welded or otherwise secured to the longitudinal margins of sheet 7d to extend laterally therefrom prior to the mounting of sheet 7d and attached strips 31a and 32a into the mold for molding of the exterior lagging 12d and the interior elastomeric layer 13d. These weld strips 31a and 32a may conveniently by fabricated from sheet steel of about 14 to 16 gauge and may be readily attached to sheet 7d by continuous electric resistance or spot welding. Where the lagging is to be used in an acid or corrosion-prone environment, the welding strips may be made of stainless steel. Also preferably the strips 3~a and 32a are given a slight concavo~convex form so as to more readily engage the curved pulley/roll periphery for welding at the contacting edges of the strips. As will be understood, the light-gauge metal sheet 7d and the elastomeric members 12d and 13d permit ready flexing for wrapping the lagginy member onto the cylindrical pulley/roll periphery as in the earlier described embodiments.
,,~
Patent Nos. 2,707,403 and 3,010,332.
One of the disadvantages of lagging products heretofore available is that moisture, sand and other abrasive particles will work themselves under the metal plates and corrode and abrade away the metal plate support for the product. In khe case of Patent No. 3,354,735, the retainer strips are of necessity fixed, as by welding to the pulley periphery, thus minimizing Elexibility in the positioning of the lagging sections on the pulley and almost inevitably resulting in an imbalanced condition Also some relative movement is inherent between the lagging 2~ sections and the retaining strips and the roll periphery which results in wear and abrasion and premature failure of the parts.
Attempts have also been made to prefor~ a full circle endless tire which is intended to be driven upon the 3~ periphery of only one corresponding diameter wheel. This technique re~uires the manufacture of specified sizes for each wheel diameterO Examples of such proposals can be found in U.S. Patent Nos. lr636,492, 1,765,402, 2,369,635, 2,673,469, 2,701,937, 2,778,234, and 3,3181165a For certain limited usages, fabric reinforced belting has been used for lagging. The practice is to cut the belting into a relatively narrow width strip which is -3~ ~ 3~
1 then spirally wound on the pulley with an adhesive, covering l00~ and fastening at various poinks and at the opposite end~ of the belting strip. This type of lagginy is subject to stretchin~ and premature failure and is essentially unidirectional in its operation, i.e., in the direction of tiyhtening of the belting strip on the roll.
Moreover, there is a disadvantage in having to work with cements and glues needed and universally used in the application of the belting strip. The application of adhesives is costly, messy and difficult, particularly over wide temperature and humidity ranges.
DISCLQSURE OF INV~NTIQN
The lagging member of the present invention is a bonded integral laminated structure comprising an interior sheet of flexible non-extensible material, a relatively thick layer of elastomeric lagging material on the normally outer side of the sheet and a relatively thin coating or laminae of elastomeric, rubber-like, material on the normally underside of the sheet. The laminated sandwich structure is flexible and may be readily wrapped on the outer surface or wall of the pulley or roll. The circumferentially spaced ends of the member are fastened to the roll periphery with the ru~ber-like coatiny at the underside of the member in frictional engagement with the periphery. This rubber undercoating prevents slippage and movement between the member and the roll; prevents corrosion and abrasive wear, seals against moi~ture and foreign materials entering between the pulley and lagging member, improves contact of the lagging member with irregular roll surfaces, facilitates the contouring of the product to the curvature of the roll and prevents kinking or sharp bending of the interior non~extensible sheet. The function of the intermediate sheet is to provide a no-stretch or yield laminate, preventing distortion ormovement o~ the assembly while turningl such as wave build-up action ahead of the point of work load and to .
7~
1 cooperatively support the fastening of the member to the pulley. The third, outer ply or layer is designed for contacting the work and may be of a multitude of designs and compositions depending on the operation involved, e.g., pulley lagging, lumber feeding, rice hulling, food processing, etc.
An object of the present invention is to provide a lagging product which can be reliably and economicaliy produced in a flat state without necessity of pre-contouring and which may be simply cut by the user tolengths to fit various pulley or roll diameters or leng~hs, and which may be easily and readly applied on site at the user's place with ordinary skill and available shop equipment. As a result, the user only need keep one size of lagging in stock for applying lagging to all of user's pulleys, processing rolls and the like in the plant, thus eliminating the need for keeping on hand a great variety oE
sizes and shapes of preformed lagging to fit pulleys and rolls of different sizes.
Another object of the present invention is to provide a lagging product and applying method which is flexible in enabling the selective coverage of the pulley or roll to the peripheral area required.
A further object of the present invention is to provide for the most easy and effective attaching of the lagging member to the pulley surface by weldiny which no~
only affords rapid and effective attachment but insures, on the ensuing cooling and contraction of the intermediate bonded sheet, the drawing of the rubber undercoating into tight fitting gripping relation on the pulley periphery.
The invention possesses other objects and features of advantage, some of which of the foregoing will be set forth in the following description of the peferred form of the invention which is illustrated in the drawings accompanying and forming part of this specification. It is to be understood, however, that variations in the showing made by the said ~rawings and description may be adopted _5~ 9733 1 within the scope of the invention as set forth in the claims.
EEI~E_rES~BIPTION OF THE ~
FIGURE l is a plan elevaticn of a lagying product constructed in accordance with the present invention.
FIGURE 2 is an enlarged plan elevation similar to Figure l but showing a portion only of the product.
FIGURE 3 is a cross-sectional view taken substantially along the plane of line 3-3 of Figure 2~
FIGURE 4 is a Eurther enlarged cross-sectional view of the product taken substantially on the plane of line 4-4 of Figure 2.
FIGURE 5 is a side elevational view of a pulley with the lagging product of the present invention applied thereto.
FIGURE 6 is a cross-sectional view of a portion of the product and pulley showing means of attachment.
FIGURE 7 is a cross-section view similar to Figure 6 but showing an alternate means of attachment.
FIGURE 8 is a fragmentary perspective view of a modified form of the lagging product.
FIGURE 9 is an elevationa1 view of a pulley/roll having another form of lagging product of the present invention applied thereto, FIGURE l0 is an enlarged fragmentary cross-sectional view taken substantially on the plane of line of l0-l0 of Figure l.
FIGURE ll is a plan view of the structure illustrated in Figure 2 as sugyested by the lines ll-ll of Figure l0.
FIGURE 12 is an elevational view of a pulley/roll having applied thereto a further modified form of the lagging material.
FIGURE 13 is an enlarged fragmentary cross-sectional view taken substantially on the plane of line 13-13 of Figure 120 ~, -G~ ~ 7 ~ 3 1 FIG~RE 14 is a plan view of the structure illustratecl in Fiyure 13 as indicated by lines 14-14 of Figure 13.
FIGURE 15 is a cross-sectional view of a further modified form of the present invention.
FIGURE 16 is a plan view of a portion of the member shown in Figure 15,as indicated by lines 16-16 on Figure 15.
~EST MO~ OF C~R~L~O~ r~Y~L~l9L
The lagging member 6 of the present invention is designed for applying to the peripheral wall 7 of a belt pulley 10, processing roll or the like, and comprises briefly a thin flexible non-extensible sheet 9; a layer 1~ flexible lagging material 12 bonded to the normally outer side of sheet 9; and a coating 13 of relatively soft rubber or other similar elastomeric material bonded to the normally underside of sheet S; and means 28 for fastening the lagging member peripherally to the outer peripheral surface 16 of wa]l 7 with the elastomeric layer 13 wrapped in torsional stress supporting, mating, engagement with the surface.
In accordance with the present invention, and as a principal feature thereof, lagging member 6 is most conveniently and economically molded in a rubber plant flat, in planar, integrally bonded, laminatedr form which may be furnished to industrial users who may cut the members to sizes for wrapping around and fastening to the exterior suriace of belt pulleys, processing rolls~ and the like. In its preferred form, the interior non-extensible sheet 9 is composed oE lightweight sheet metal which will afford adequate tensile strength while yet being sufficiently flexible for wrapping upon the periphery of the pulley wall in close conformity thereto. Sheet steel of up to about 1.6 m~m. thicknes has been found satisfactory for the wide range of applications to which the product has been tested~ The laminated structure 7 ~ 73~3 l comprises a relatively thick layer of lagging material 12 which is basically an elastomeric tread-like material which is bonded to the normally outer sicle of sheet ll and a relatively thin coating or laminae of elastomeric raaterial 5 13 bonded to the normally underside of sheet ll~ The whole product is thus quite flexible and may be readily wrapped upon the circular periphery of the pulley/roll. It has been found that the lightweight metal insert will support the fastening means, the sheer stresses to which the product is subjected, and provide dimensional stability;
while the elastomeric undercoating 13 provides torsional grip, relieving the load on the fastening means and only requiring the latter to hold the rubber undercoating in snug frictional engagement with the pulley/roll wall 7.
As a principal feature of the present invention, the lagging member may be readily applied to the circular pulley/roll wall by simply wrapping the member on the wall and merely fastening the circumferentially spaced ends 17 and 18 of the lagging member. Any convenient form of ~ pinning, staplingl rivetting or welding of such ends may be used, it being noted that the essential function of such fastening is to secure the lagging member in a circumferential embrace on the pulley/roll wall. ~he elastomeric undercoating 13 will provide torsional grip and cofunction with fastening means 28 to carry the load.
One of the discoveries of the present invention is that the forces to which the lagging is subjected in use, as in the driving of a conveyor belt or the like, are primarily shear Eorces and that the pressure exerted by the belt upon the lagging, which is backed up by the pulley wall, retains the lagging in pressuri~ed contact with the pulley wall. I have found that this resistance to shear is readily obtained by the combination of the non-extensible ; member insert 9 and the bonding thereof to the inner and outer laminas 12 and 13. As above noted, difEerent elastomeric materials may be used in the two laminas 12 and 13, the only requirement being that the elastomeric ' ~
''3~3;~
1 materials be bonded to the interior reinforcirlg ~heet 9.
~or most purposes elastomeric material having a durometer of about 50 to 60 shore A may be used for the laminas.
Member 9 is preferably formed of sheet metal of about 16 to 28 gauge, so as to afford adequate tensile strength while yet being sufficiently flexible for wrapping upon the periphery of the pulley wall in close conformity theretoO Other non-metallic materials may be used having requisite non-extensible strength, bondability to the elastomeric product, and flexibility for wrapping onto the periphery of the belt pulley or roll. Suggested for such use are non-extensible plastics such as phenolics, epoxy resin reinforced with fiberglass, polycarbonates, polyester resins, resins made from urea and formaldehyde, ABS
(acrylonitrile butadine styrene) and Rrealstic (TM~.
Member 9 is disposed within the body of the elastomeric product offset from the center plane near the underside 11 thereof so as to provide the above described three~ply laminate structure, viz. a relatively thick outer lagging ; 20 section 12, lamina 9 and a relatively thin bottom section 13 enyaging the pulley wall 7. The elastomeric material making up laminas 12 and 13 may be the same, or they may be readily seleted for best performance under different individual applications. Preferably the rubber material in section 13 is relatively soft so as to provide a high coefficient of friction in its contact with pulley wall 7 and prevention of movement of the lagging product while in service, and at the same time providing for optimum contact with the wall in conforming to minor irregularities, protecting the metal insert against corrosion and abrasion, and preventing entry of materials between the lagging and the pulley, an important protection in food processing operations. At the same time the bottom rubber lamina 13 permanently bonded to the underside of the metal sheet, helps to prevent kinking or creasing of the metal when bending to conform to smaller diameter pulley surfaces. I
have found that this thin rubber backing in combination '3733 1 with the non-extensible sheet, so long as applied in intimate contact with the pulley/roll wall, and without further compression, will positively lock the lagging product against slippage on the pulley/wall surEace.
In the form of the invention illwstrated in Figures 1-4, the lagging member is molded of a width designed for side-by side placement of a multiplicity of strips along the lengthwise dimension of pulley wall 7, as seen in Figure 5, with the length of the strip extending circumferentially of wall 7. The molded strip may be conveniently made in relatively narrow widths, say 5-10 centimeters, and of any convenient manufacturing length such as 300 to 1,000 centimeters or more. The product thus dimensioned may be conveniently furnished to the user in flat length or coiled form. The user will then cut off from the supplied length of material a piece which has a length corresponding to the circumference o the roll to be covered.
In the application of the lagging product to the pulley, it has been found that due to the il~herent frictional characteristics of the rubber backing, difficulty may be experienced in obtaining a circumferentially straight alignment of the lagging strips in tight, full face contact with the pulley wall. As pressure is applied to the lagging to obtain a tight contact, the rubber backing acts to prevent movement and retains the assembly in position as first placed. In order to obtain 100% contact between the lagging and pulley surfaces, some adjustment of positioning of the lagging on ~he pulley is highly desired if not required. Any deviations of the length of the lagging from a cross-sectional plane perpendicular to the axis of the pulley will result in a void at one edge of the lagging due to each edge of the lagging contacting the pulley at different radii. In order to facilitate ~he proper precise mountiny of the lagging product on the pulley face, I apply to the contacting surfaces a volatile liquid lu~ricant which :Lo~ 3~
1 permits adjustment of the position of the lagging into a precision Eit. Water, preferably with a wetting agent is satisfactory, e.g., a 15% alcohol solution. As a feature of the present inventionl the bottom lamina 13 is formed with a plurality of longitudinally spaced transversely extendin~ grooves 16 deEining longitudinally spaced transversely extending pulley wall engaging lands 17 with open passageways therebetween for discharging of the lubricant applied to the wall and the underside of the lagging and expressed from the lands 17 upon securing of the lag~ing product to the wall.
In the form of the invention illustrated in Figures 1-4, the user will cut a length of lagging to correspond with the circumference of the pulley wall to be covered. The liquid volatile lubricant will then be applied ether to the wall or the underside of the member and the strip laid circumferentially on the wall and adjusted to its exact position and with its opposite ends 21 and 22 brought into opposed relation as seen in Figure 6~ Preferably a banding means 23, see Figure 5, is applied to the strip for circumferentially compressing the strip on the pulley wall so as to obtain 10~% face-to-face contact.
In this operation, excess lubricant will be squeezed into the grooves 16. A standard strapping tool may be used such as Band-It ~TM), Punch-Lock (TM) or chain-type vice grip.
Tightening of the clamp is effected while the lagging is movable and lubricated. The pattern of grooves 16 and lands 17 also provide a series of sharped edged squeegy contacts which further enhance the gripping ability of an otherwise smooth rubber backing to the pulley surface.
Additionally~ it has been found advantageous to apply to the peripheral surface o~ the pulley/roll, a coating for protecting the surface against rust and corrosion and also to improve the frictional grip of the elastomeric layer 13. A latex-type paint such as used for undercoating on automotive vehicles is very satisfactory.
A neoprene water solutioll as sold by Neoprene International ~ 3 1 Corporation, Glen Ellyn, Illinois/ is an excellent material for this use, The latex-base paint sets up hard~
s~bstantially tack-free, seals the pulley/roll surface against rust and corrosion, and cofunctions with the rubber backing to securely hold the lagging member in place.
A6 a feature of the present invention, the strip width of the lagging product is confined to a manageable width for precise mounting on a pulley wall and for full-face intimate contact against the pulley wall by the clamp member 23. At the same time the relatively narrow width of the lagging strip permits the ready disposition of a plurality of strips across the longitudinal dimension of the pulley as seen in Figure 5. The user may thus readily select the amount of pulley surface to be covered. In many instances it is only necessary to cover 60 to 70% of the pulley surfaces. Circumferential grooves around the finished pulley may thus be easily provided for taking away water, mud or other products being transported by a belt entrained around the lagging; and one or more of such grooves may also be used as a guiding channel for a V-belt or the like.
; Securement of the lagging strips is here effected by fastening the opposite ends 21 and 22 of the lagying strip to the pulley wall or to each other as seen in Figures 5, 6 and 7. Thi.s may be done by means pinning the opposite ends 26 and 27 of member 9 to the pulley wall 7 or to each other by riveting, stapling, bolting or welding.
As seen in Figure 6, the outer lagging lamina 12 is cut back to expose the opposite ends 26 and 27 o member 9 and these ends may then be ~onveniently pinned by rivets 28 to the pulley wall as illustratedO They may also be pinned down by spot welding to the wall with the same result.
Another form of fastening o~ the lagging is illustrated in Figure 7, where the opposite ends 26a and 27a of ~ember 9a are brought into overlapping position and pinned together by one or more rivets 28a. Here again, the overlapping ends 26a and 27a could be suitably crimped or spot welded -12~ 97~3 1 together. The width of the surrounding clamping band 23 may be substantially less than the width o the elastomeric strip, as seen in Figure 5, and still provide full compressive holding of the strip to the pulley wall.
Accordi~gly, ample room is left on opposite sides of the band for placement of rivets 28 or for spot-welding or the like~ Where riveting is used, the internal reinforcing member 9 eliminates fastener pull~through problems.
A modified form of the invention is illustrated in Figure 8 of the drawings, wherein the product is composed of a broad, flat sheet 31 of flexible elastomeric material and a plurality of flat~ elongated, thin, flexible metal or other non-extensible members 9a mounted in substantially co-planar, parallel, laterally spaced apart and longitudinally coterminous position in a mid~plane of sheet 31 and bonded integrally thereto so as to provide a relatively thicls outer lagging section 12a and a relatively thin protective and wall gripping undercoating 13aO The latter as in the first described embodiment is formed with a plurality of longitudinally spaced, transversely extending grooves 16a for discharge of above described lubricant/adhesive; although the use of a lubricant is not as critical in this form of the invention. As an important feature of this construction, the sheet is readily severable between the members 9a to provide a plurality of elastomeric strips similar to strip 8 hereinabove described, that is of a width designed for side-by-side placement of a multiplicity of such strips along the lengthwise dimension of the pulley wall, the strips being severable transversely to desired length for wrapping upon and securing to the pulley wall with the length of the strip extending circumferentially of the wall as hereinabove explained, The product as illustrated in Fiyure 8 may be economically produced in large sheets in a 3~ molding press. Lateral`spacing between the reinforcing members 9a permits readily slicing of the elastomeric material between the members to provide the desired ~, ~3~ 33 1 longitudinal strips. To facilitate the slicing of the sheets into the individual strips, the outer, thick, elastomeric section 12a may he formed with a plurality of longitudinally extending slits 32 which are aligned longitudially with the spaces between members 9a and extend midway into the outer section 12a to make easy and precise the cutting through of the elastomeric material.
Various tread-like suraces may be molded into the outer side of lagging section 8 to provide a rubber-like tread, non-slip characteristics, and to facilitate processing operations, e.g. rice hulling, lumber feed rolls, nut processing, sheet steel conveying, etc~ Lorig-type grooves may be similarly provided. Since the strip is applied to the pulley or roll in a circumferential plane perpendicular to the axis of rotation, the lagging is bi-directional enabling the pulley or roll to be driven in either of its opposite directions with equal effect and performance, Another advantage of the present lagging is the ease in which step crowning of the pulley may be accomplished to improve belt training by simply applying to the pulley over the central section thereof one or more lagging strips of greater thickness than the strip~ applied to the opposite end portions of the pulleyO A step crowned pulley will have about 60% of the center section raised, and about 20~ at each end of the pulley lowered, the step ranging about 1.6 mm or more.
As a special feature of the forms o-E the invention shown in Figures 9-16 the fastening of the circumferentially spaced edges ~-lb and 22b may be easily and effectively accomplished by welding these ends to the pulley/roll periphery where the latter is of conventional steel construction. Welding apparatus and experience is ~ most commonly available in industrial plants which will ; 35 make use oE the lagging product and will many times be the fastening means of choice There is another and important advantage in welding the ends of the lagging product to the 7~l~
1 pulley/roll periphery in that the welding process, as a by-productl produces a heating and expansion of the metal at the time of attachment and thus provides upon ensuing cooling and contraction a tightening of the elastomeric laminate 13 onto the peripheral pulley/roll surface 16.
While the welding of the lagging member ends may frequently be the attachment of choice, the internal stabilizing sheet 11 is required to be only of a light gauge, as above explained, and in its preferred form is too light for normal weldingO Accordingly, and as a further feature of the present invention, separate members 31 and 32 of weldable weight metal are mounted at the circumferentially spaced edges 21b and 22b. In the forms of the invention shown in Figures 1-6, these members comprise channels having opposed side walls 43 and 44 and connecting wall 45 which may be mounted in surrounding relation to ends 21b and 22b so as to tightly grip within each channel the bonded laminate comprising sheet 9b and at least some elastomeric product on opposite sides thereof.
Thus the channel members provide a complete and effective seal for the circumferentially spaced edges of the lagging product, protecting the interior metal sheet against rustr corrosion or other deterioration. To enhance this Eeaturer channels 31 and 32 are preferably formed of stainless steelO
In the application of the lagging member to the pulley/roll, the lagging member is cut to a length corresponding to the circumference of the pulley/roll. The relatively thick lagging 12b is preferably reduced in thickness adjacent ends 21b and 22b, using an appropriate cutting tool, so as to provide an overall thickness which will it snugly within channels 31 and 32. The channels may then be clamped onto the ends by any suitable means.
Indenting or deforming one or both of channel walls 43 and 44 will accomplish the desired purpose. This may be done with a simple indenting punch, the results of which will be noted in the drawings where one side of each of the -lS~ ~ 7~3 1 channels is jointly deformed with the interior ~heet 9b into one of the adjacent laminae, here laminae 13b.
The lagging member formed as above may then be wrapped around the pulley/roll periphery as above described. A bead of welding material 46 may then be placed at the confronting ends of the channels and the pulley/roll surface 16. The lagging member ends may be brought quite close together as here shown or may be somewhat further apart and separately welded as suits the convenience of the user. Spacing between the confronting edges will be typically up to about one centimeter or more.
A further modified form of the invention is illustrated in Figures 12-14 wherein the lagging member 6c is especially formed for mounting longitudinally of pulley~roll 7c. In this case the integrally molded laminated structure comprises the same interior ~etal sheet 9c, relatively thick outer layer 12c of lagging material and relatively thin interior layer llc of elastomeric material, the product being molded flat in any desired ~ convenient and economical length. Since the circumferen-tially spaced edges 17a and 18a will extend along the longitudinal sides of the molded strip, these sides may readily be molded to provide margins of reduced thickness of the lagging material 12c so as to provide preformed edge sections which will fit within channels 21a and 22a. The latter may be secured to these margins by indenting or otherwise as hereinabove explained. In the application of this form of the invention, the lagginy material is cut to a length corresponding with the axial length or face width of the pulley/roll. I have found it convenient to weld one of the longitudinally extending channels to the peripheral wall 7c of the pulley/roll with the welded edge and weld beads 46a extending parallel to the axis of the pulley/roll. The product will tend to stand off tangentially from surface 7c but is sufficiently flexible to readily flex into wrapping relation around surface 16a by the use of any simple banding of holding tool. The ~.
-16~ 33 1 oppo~ite edge channel may then be welded to surface 7c to fasten the lagging in place. Additional lagging members may be similar]y fastened to the pulley/roll periphery, covering such portion of the circumference as desired. By accurate spacing of the lagging members, more perfect balance can be achieved, as contrasted to prior art lagging.
A further modified form of the invention is illustrated in Figures 15 and 16 wherein the lagging member 6d is especially formed for mounting longitudinally of the pulley/roll similar to the embodiment of Figures 12-14. In this case the circumferentially spaced edges 17b and 18b will extend along the longitudinal sides of ~he member and thus readily accommodate within the mold, extra pieces 31a and 32a of heavier gauge, weldable weight, sheet metal. In accordance with the present invention, these members are first cut in strips having a length equal to the length of the interior metal sheet 7d, and the strips 31a and 32a are positioned upon and tack-welded or otherwise secured to the longitudinal margins of sheet 7d to extend laterally therefrom prior to the mounting of sheet 7d and attached strips 31a and 32a into the mold for molding of the exterior lagging 12d and the interior elastomeric layer 13d. These weld strips 31a and 32a may conveniently by fabricated from sheet steel of about 14 to 16 gauge and may be readily attached to sheet 7d by continuous electric resistance or spot welding. Where the lagging is to be used in an acid or corrosion-prone environment, the welding strips may be made of stainless steel. Also preferably the strips 3~a and 32a are given a slight concavo~convex form so as to more readily engage the curved pulley/roll periphery for welding at the contacting edges of the strips. As will be understood, the light-gauge metal sheet 7d and the elastomeric members 12d and 13d permit ready flexing for wrapping the lagginy member onto the cylindrical pulley/roll periphery as in the earlier described embodiments.
,,~
Claims (25)
1. A flat, planar, flexible member adapted for application to the peripheral wall of a belt pulley, processing roll or the like comprising:
a thin flexible non-extensible sheet, a layer of lagging material bonded to the normally outer side of said sheet;
an elastomeric coating bonded to the normally underside of said sheet and providing corrosion and abrasion protection therefore and being adapted for placement upon and to provide gripping engagement with said wall;
said member being adapted for cutting to a size to lie upon and having a flexibility enabling it to conform to various curvatures of said wall in mating engagement therewith; and means securing circumferentially spaced edges of said member with said elastomeric coating in gripping engagement with said wall.
a thin flexible non-extensible sheet, a layer of lagging material bonded to the normally outer side of said sheet;
an elastomeric coating bonded to the normally underside of said sheet and providing corrosion and abrasion protection therefore and being adapted for placement upon and to provide gripping engagement with said wall;
said member being adapted for cutting to a size to lie upon and having a flexibility enabling it to conform to various curvatures of said wall in mating engagement therewith; and means securing circumferentially spaced edges of said member with said elastomeric coating in gripping engagement with said wall.
2. The device of claim 1, said sheet being formed of sheet steel of up to about 1.6 m.m. thickness.
3. The device of claim 1, said member having a width designed for side-by-side placement of a multiplicity of members along the lengthwise dimension of said wall and having a length for wrapping substantially circumferentially around said wall.
4. The device of claim 1, said coating being formed on its normally under, wall-engaging, side with a plurality of spaced grooves defining spaced wall engaging lands and open passageways therebetween for discharge of lubricant applied as a placement aid to said wall and expressed from said lands upon said securing member.
5. The device of claim 2, said sheet being bonded within a unitary elastomeric mass and offset from the center plane thereof to form said coating and layer with relatively thin and thick depths respectively.
6. The device of claim 5, means comprising rivets adapted for securing said edges to said wall.
7. The device of claim 6, said rivets securing said cirumferentially opposite edges to each other.
8. The device of claim 2, said means comprising weldable weight metal disposed at said edges.
9. The device of claim 8, said means comprising metal channels fastened on said member at said edges.
10. The device of claim 9, said edges comprising laminae of elastomeric material bonded to the opposite sides of said sheet, and said channels being mounted on said edges in surrounding relations to said laminae and sheet.
11. The device of claim 10, one side of each of said channels being jointly deformed with said sheet into one of said laminae.
12. The device of claim 2, said member being molded to provide a bonded intregal laminated structure comprising an interior metal sheet, a relatively thick layer of lagging material on the normally outer side thereof and a relatively thin layer of elastomeric material on the normally underside thereof;
said outer layer being formed to provide margins of reduced thickness adjacent said circumferentially spaced edges; and channels of weldable metal mounted in surrounding relation to said edges and clamping said margins, sheet, and elastomeric layer.
said outer layer being formed to provide margins of reduced thickness adjacent said circumferentially spaced edges; and channels of weldable metal mounted in surrounding relation to said edges and clamping said margins, sheet, and elastomeric layer.
13. The device of claim 1, said means comprising strips of weldable weight metal adapted for welding to said wall and being secured to said sheet and projecting laterally therefrom and from said layer and coating.
14. The device of claim 13, said sheet being composed of sheet metal and said strips being welded to normally cir-cumferentially spaced margins of said sheet.
15. The device of claim 1 comprising, a plurality of sheets, each being elongate and located with respect to one another substantially co-planar, laterally spaced and longitudinally coterminous, one of said layer and said coating having a lateral dimension sufficient to permit bonding thereof to each of said sheets, said layer and coating being severable between said sheets to provide a plurality of strips each having a lateral dimension designed for side-by-side placement of a multiplicity of said strips along the lengthwise dimension of said wall.
16. The device of claim 15, said sheets being each composed of sheet steel of about 16 to 28 gauge.
17. The method of securing to the cylindrical wall of a pulley, processing roll or the like, a lagging member composed of lagging material and an elastomeric laminate bonded to the opposite sides of a flexible non-extensible sheet and having a dimension smaller than the circumference of said wall, comprising:
applying said member on said wall with its said
17. The method of securing to the cylindrical wall of a pulley, processing roll or the like, a lagging member composed of lagging material and an elastomeric laminate bonded to the opposite sides of a flexible non-extensible sheet and having a dimension smaller than the circumference of said wall, comprising:
applying said member on said wall with its said
Claim 17 continued ...
dimension extending circumferential of said wall to provide circumferentially spaced ends of said member and with said elastomeric laminate in engagement with said wall; and fastening said member ends peripherally to said wall with said elastomeric laminate wrapped in stress-supporting mating engagement therewith.
dimension extending circumferential of said wall to provide circumferentially spaced ends of said member and with said elastomeric laminate in engagement with said wall; and fastening said member ends peripherally to said wall with said elastomeric laminate wrapped in stress-supporting mating engagement therewith.
18. The method of claim 17, and applying to said wall a volatile lubricant permitting adjustable positioning of said member on said wall prior to said fastening step.
19. The method of claim 18 wherein said member is of elongated form having a width designed for side-by-side placement of a multiplicity of members along the lengthwise dimension of said wall and said fastening step is confined to circumferentially ends of said member.
20. The method of claim 19 wherein said fastening steps comprises rivetting of said ends.
21. The method of claim 17 wherein said sheet is metal and said member is provided at its circumferentially spaced ends with weldable weight metal and said applying and fastening steps comprise:
wrapping said member upon said wall; and welding said weldable weight metal to said wall.
wrapping said member upon said wall; and welding said weldable weight metal to said wall.
22. The method of claim 21;
encasing said circumferentially opposite ends and contiguous layers of said material and laminate within channels providing said weldable weight metal.
encasing said circumferentially opposite ends and contiguous layers of said material and laminate within channels providing said weldable weight metal.
23. The method of claim 22; and crimping said channels on said opposite ends and contiguous layers.
24. The method of claim 17 wherein said sheet is composed of lightweight sheet metal;
securing to opposite side margins of said sheet and projecting laterally therefrom and from said lagging material and laminate, strips of weldable weight sheet metal; and welding said strips to said wall.
securing to opposite side margins of said sheet and projecting laterally therefrom and from said lagging material and laminate, strips of weldable weight sheet metal; and welding said strips to said wall.
25. The method of claim 17, and coating said wall with a latex-base paint and permitting said paint to set prior to said applying said member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16809480A | 1980-07-14 | 1980-07-14 | |
| US168,094 | 1980-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1189733A true CA1189733A (en) | 1985-07-02 |
Family
ID=22610097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000381451A Expired CA1189733A (en) | 1980-07-14 | 1981-07-09 | Lagging product and method for belt pulleys, processing rolls and the like |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0055764A1 (en) |
| CA (1) | CA1189733A (en) |
| WO (1) | WO1982000326A1 (en) |
| ZA (1) | ZA814461B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60213604A (en) * | 1984-04-06 | 1985-10-25 | Kawamoto Kogyo Kk | Shape of wear-resisting lagging material |
| US6168544B1 (en) | 1997-04-17 | 2001-01-02 | Flexible Steel Lacing Company | Pulley lagging |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1593751A (en) * | 1925-05-11 | 1926-07-27 | Andrew G Carter | Pulley cover |
| US1803357A (en) * | 1929-01-26 | 1931-05-05 | Robins Conveying Belt Co | Pulley |
| US1765402A (en) * | 1929-07-20 | 1930-06-24 | Carter Products Company Inc | Wheel or pulley for band saws |
| US1811916A (en) * | 1930-05-31 | 1931-06-30 | Carter Products Company Inc | Band saw wheel |
| US1838164A (en) * | 1931-09-03 | 1931-12-29 | Carl E Tannewitz | Band saw wheel and tire therefor |
| US2050202A (en) * | 1935-03-09 | 1936-08-04 | Wingfoot Corp | Method of making a rubber tire |
| BE470774A (en) * | 1941-04-19 | |||
| US2533456A (en) * | 1946-09-20 | 1950-12-12 | William H Harrison | Lagging for use on belt pulleys |
| US2747420A (en) * | 1953-01-21 | 1956-05-29 | Gen Tire & Rubber Co | Belt take-up mechanism |
| US3318165A (en) * | 1964-05-25 | 1967-05-09 | Formax Mfg Corp | Contact wheel |
-
1981
- 1981-07-01 ZA ZA814461A patent/ZA814461B/en unknown
- 1981-07-06 WO PCT/US1981/000903 patent/WO1982000326A1/en unknown
- 1981-07-06 EP EP81902110A patent/EP0055764A1/en not_active Withdrawn
- 1981-07-09 CA CA000381451A patent/CA1189733A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| WO1982000326A1 (en) | 1982-02-04 |
| EP0055764A1 (en) | 1982-07-14 |
| ZA814461B (en) | 1982-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US12043070B2 (en) | Flexible metallic web elements for non-pneumatic tire | |
| US4718544A (en) | Flexible lagging strips for drum pulleys | |
| US20030195072A1 (en) | Composite sprocket | |
| US7703600B1 (en) | Transport belt with link carcass | |
| US9605730B2 (en) | Adjustable elevator belt splice | |
| SE465567B (en) | OF ELASTIC MATERIAL MANUFACTURED TREATMENT BANDS, SPECIFICALLY BEFORE EXCHANGE STEPS | |
| CA1189733A (en) | Lagging product and method for belt pulleys, processing rolls and the like | |
| US10533630B2 (en) | Belting connection mechanism | |
| US6565689B2 (en) | Non-slip conveyor and method for producing same | |
| CA1128339A (en) | Belt and methods of manufacture | |
| US4549040A (en) | Splice case | |
| AU737733B2 (en) | Guide rail splice | |
| US4667812A (en) | Conveyor belt assembly and method | |
| JPS62155354A (en) | V belt for non-stage transmission | |
| US4065138A (en) | Metal mesh strip and embedded fin gasket for shielding against electromagnetic interference | |
| US4741235A (en) | Apparatus for splicing belt | |
| US4495019A (en) | Plywood bending | |
| CA1335209C (en) | Elastomeric sealing gasket assembly and its method of manufacture | |
| US4671834A (en) | Method of splicing belt | |
| WO1998049484A1 (en) | Clamps | |
| US4342561A (en) | Power transmission belt | |
| US20230407138A1 (en) | An isolator for protecting dissimilar substrates from galvanic corrosion | |
| GB2105638A (en) | Double band press | |
| US1605950A (en) | Belt fastener | |
| EP0188358A2 (en) | Antifouling material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |