LAGGING MEMBER AND METHOD FOR BELT PULLEYS,PROCESSING ROLLS AND THE LIKE

Abstract: A lagging member (6) for the peripheral wall (7) of a belt pulley (10), processing roll or the like which comprises a laminated structure made up of a thin flexible non-extensible sheet (9), nominally metal; flexible lagging material (12) bonded to the normally outer side of the sheet (9); a layer (13) of flexible elastomeric material bonded to the normally underside of the sheet (9); and means (28) for fastening the member peripherally to the pulley/roll surface (16) 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 (31, 32) which is adapted for welding to the pulley/roll surface (16).

Description: -_!- LAGGING MEMBER AND METHOD FOR BELT PULLEYS, PROCESSING ROLLS AND THE LIKE TECHNICAL FIELD The invention relates to what is commonly referred to as pulley lagging, i.e., an elastomeric tread product whicn 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 elim¬ inating slippage, and to promote belt alignment. The product is equally applicable to conveyor belt idler rolls and many types of steel rollers used in industry as pro- cessing or driving rolls. PACKGRQUNP QF ART Rubber lagging is most commonly applied to steel pulleys, rollers and the like by rubber companies having special equipment for this purpose. ' When the lagging is worn, 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 costl 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 supplying through trade channels to the ultimate user, of arcuately formed steel backing plates on which the rubbe ___ ^ lagging is 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 No. 3,354,735 wherein the backing plates are designed for mounting in guide and retaining members 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 preformed lagging sections 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 the case of Patent No. 3,354,735, the retainer strips are of necessity fixed, as by welding to the pulley periphery, thus minimizing flexibility 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 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 preform a full circle of lagging products which may be bolted to or driven upon the periphery of a corresponding diameter pulley. This technique requires the manufacture of specified sizes for each roll diameter. While such structures are sug¬ gested in the prior art, applicant is aware of no known commercial use. Examples of such proposals can be found in U.S. Patent Nos.1,636,492, 2,673,469, 2,701,937 and 2,778,234. For certain limited usages, fabric reintorced belting has been used for lagging. The practice is to cut the belting into a relatively narrow width strip which is then spirally wound on the pulley with an adhesive, covering 100% and fastening at various points and at the opposite ends of the belting strip. This type of lagging is subject to stretching and premature failure and is essentially unidirectional in its operation, i.e., in the direction of tightening 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. DISCLOSURE OF INVENTION 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 layer 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 the pulley or roll. The circumferentially spaced ends of the member are fastened to the roll peri¬ phery with the rubber-like coating at the underside of the member in compressive engagement with the periphery. This rubber undercoating or layer prevents slippage and movement between the member and the roll, prevents corrosion and abrasive wear, seals against moisture and foreign materials entering between the pulley and lagging member, improves contact ot 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 metal. The function of the inter¬ mediate ply is to provide a no-stretcn or yield laminate, preventing distortion or movement of the assembly while turning, such as wave build-up action ahead of the point of work load and cooperatively supports 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 ot the present invention is to provide a lagging product which can be reliably and economically produced in a flat state without necessity of pre-con- touring and which may be simply cut by the user to lengths to fit various pulley diameters or lengths, 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, pro- cessing rolls and the like in the plant thus eliminating the need for keeping on hand a great variety of 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 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 welding which not 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 compression-tight fitting gripping relation on the pulley periphery. The invention possesses other objects and fea¬ tures 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 drawings and description may be adopted within the scope of the invention as set forth in the claims. BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a plan elevation of a lagging product constructed in accordance with the present invention. FIGURE 2 is an enlarged plan elevation similar to Figure 1 but snowing 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 further 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 elevational view of a pulley/roll having another form of lagging product of the present invention applied thereto. FIGURE 10 is an enlarged fragmentary cross- sectional view taken substantially on the plane of line of 10-10 of Figure 1. FIGURE 11 is a plan view of the structure illustrated in Figure 2 as suggested by the lines 11-11 of Figure 10. 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 12. OMPI FIGURE 14 is a plan view of the structure illustrated in Figure 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 7, as indicated by lines 16-16 on Figure 15. BEST MODE OF CARRYING OUT THE INVENTION 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; flexible lagging material 12 bonded to the normally outer side of sheet 9; and a layer 13 of relatively soft rubber or other similar elastomeric material bonded to the normally under¬ side of sheet 9; and means 28 for fastening the lagging member peripherally to the outer peripheral surface of wall 7 with the elastomeric layer 13 wrapped in torsional stress supporting mating engagement with surface. In accordance with the present invention the lagging member may be most conveniently and economically molded in a rubber plant as a flat integrally bonded laminated structure which may be furnished to industrial users who may cut the sheets to sizes for wrapping around and fastening to the exterior surface of belt pulleys, processing rolls, and the like. In its preferred form, sheet 9 is composed of lightweight sheet metal which will afford adequate tensile strength while yet being suffi¬ ciently flexible for wrapping upon the periphery of the pulley wall in close conformity thereto. Sheet steel of about 16 to 28 gauge has been found satisfactory for the wide range of applications to which the product has been tested. The laminated structure comprises a relatively thick layer ot lagging material 12 which is basically an elastomeric tread-like material which is bonded to the OMPI W normally outer side of sheet 11 and a relatively thin layer or laminae of elastomeric material 13 bonded to the nor¬ mally underside of sheet 11. The whole product is thus quite flexible and may be readily wrapped upon the circular peripnery of the pulley/roll. It has been found that the lightweight metal insert will support the fastening 24, the sheer stresses to which the product is subjected and pro¬ vide dimensional stability, while the elastomeric under- coating 13 provides torsional grip, relieving the load on fastening 28 and only requiring the latter to hold the rubber undercoating in snug compression on the pulley/roll wall 7. As a further feature of the present invention the lagging member may be readily applied to the pulley/roll periphery by simply wrapping the product on the peripnery and merely fastening to the periphery the circu ferentially spaced ends 17 and 18 of the lagging member. Any conve¬ nient form of pinning, stapling, rivetting of. such ends may be used, it being noted that the essential function of such fastening is to secure the lagging product in a circum¬ ferential embrace of the pulley/roll periphery. The 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, are primarily shear forces and that the pressure exerted by the belt upon the lagging, which is backed up by the pulley, retains the lagging in pressurized contact with the pulley, actually in compression. I have found that this resistance to shear is readily obtained by the combination of the non-extensible member insert and the bonding thereof to the inner and outer la inas 12 and 13. As above noted, different elasto¬ meric materials may be used in the two laminas 12 and 13, the only requirement being that the elastomeric materials be bonded to the interior reinforcing member and to them¬ selves. For most purposes elastomeric material having a ØT E MPI durometer of about 50 to 60 shore A may be used for laminas. Member 9 is preferably formed as an elongated strip of sheet metal of about 16 to 28 gauge, so as to afford adequate tensile strength while yet being suffi¬ ciently flexible for wrapping upon the periphery of the pulley wall in close conformity thereto. Other non- metallic materials may be used having requisite non- extensible strength, bondability to the elastomeric pro- duct, and flexibility for wrapping onto the periphery of the belt pulley or roll. Suggested for such use are rigid 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 Krealstic (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 section 12, lamina 9 and a relatively thin bottom section 13 engaging the pulley wall 7. The elastomeric material making up laminas 12 and 13 may be the same, or they may be readily selected 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 ot 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, pro- tecting 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 strip, 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 placed under ■ T^EA compression by both the mounting technique of the present invention and the pressure of the conveyor belt, will posi¬ tively lock the lagging product against slippage on the pulley surface. In the form of the invention illustrated 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, etc. 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 of the roll to be covered. In the application, of the lagging product to the pulley, it has been found that due to the inherent fric- tional 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 or positioning of the lagging on the pulley is highly desired if not required. Any deviations of the length or the lagging from a cross-sectional plane perpen¬ dicular to the axis of the pulley will result in a void at one eoge of the lagging due to each edge of the lagging contacting the pulley at different radii. In order to facilitate the proper precise mounting of the lagging product on the pulley face, I apply to the contacting surfaces a volatile liquid lubricant which permits adjustment ot the position of the lagging into a precision fit. Water, with a wetting agent is satisfactory, e.g., a 15% alcohol solution. Preferably the bottom lamina 13 is formed with a plurality of longitudinally spaced trans- versely extending grooves 16 defining longitudinally spaced transversely extending pulley wall engaging lands 17 with opening 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 lagging product to the wall. In accordance with the present invention the user will cut a length of lagging to correspond with the circum¬ ference of the pulley wall to be covered. The liquid volatile lubricant will then be applied to the wall 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. Prefer¬ ably 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 100% face-to-face contact. In this operation excess lubricant will be squeezed in the grooves 16. A standard straping 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 whicn 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 of the pulley/roll, a coating for protecting the surface against rust and cor¬ rosion 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 solution as sold by Neoprene International Corporation, Glen Ellyn, Illinois, is an excellent material for this use. The latex-base paint sets up hard, substantially 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. As 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 compression 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 ot the lagging strips is here effected by fastening.the opposite ends 21 and 22 of the lagging strip to the pulley wall or to each other as seen in Figures 5, 6 and 7. This 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 of member 9 and these ends may then be conveniently pinned by rivets 28 to the pulley wall as illustrated. They could also be pinned down by spot welding to the wall with the same result. Another form of fastening of the lagging is illustrated in Figure 7, where the opposite ends 26a and 27a of member 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 together. The width of the surrounding clamping band 23 may be substantially less than the width of the elastomeric strip, as seen in Figure 5, and still provide full compres- sive holding of the strip to the pulley wall. Accordingly, ample room is left on opposite sides of the band for place¬ ment 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 com¬ posed 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 sub¬ stantially 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 rela- tively thick outer lagging section 12a and a relatively thin protective and wall gripping undercoating 13a. 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. 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 wraping 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 Figure 8 may be economically produced in large sheets in a molding press. Lateral spacing between the reinforcing members 9a. permits readily slicing of the elastomeric material between the members to provide the desired longitudinal strips. To facilitate the slicing of the sneets into the individual strips, the outer, thick, elastomeric section 12a is formed with a plurality of longitudinally extending slits 32 which are aligned ^rJΕEA OMPI 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 surfaces 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 ot 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 accom¬ plished to improve belt training by simply applying to the pulley over the central section thereof one or more lagging strips ot greater thickness than the strips applied to the opposite end portions of the pulley. 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 aoout 1.6 mm or more. As a special feature of the forms of the inven- tion shown in Figures 9-16 the fastening of the circum¬ ferentially spaced edges 21b 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 make use of 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 pulley/roll periphery in that the welding process, as a by- product, produces a heating and expansion of the metal at the time of attachment and thus provides upon ensuing OMPI 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 sta- bilizing sheet 11 is required to be only of a light gauge, as aoove explained, and in its preferred form is too light for normal welding. 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 thus protecting the interior metal sheet against rust, corrosion or other deterioration. To enhance this feature, channels 31 and 32 are preferably formed of stainless steel. In the application of the lagging member to the pulley/roll, the lagging member is cut to a length corres- ponding 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 fit snugly within cnannels 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 channels is jointly deformed with the interior sheet 9b into one of the adjacent laminae, here laminae 13b. OMP 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 metal sheet 9c, relatively thick outer layer 12c of lagging material and relatively thin interior layer lie 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 whicn 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 lagging 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 opposite edge channel may then be welded to surface 7c to fasten the lagging in place. Additional lagging members may be similarly OMPI fastened to the pulley/roll periphery, covering such por¬ tion of the circumference as desired. By accurate spacing of the lagging members, 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 the 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 sneet 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 there¬ from 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 sneet 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 31a 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 lagging member onto the cylindrical pulley/ roll periphery as in the earlier described embodiments.

Claims: WHAT IS CLAIMED IS; 1. A lagging member for the cylindrical peri¬ pheral wall of a belt pulley, processing roll or the like comprising: a thin flexible non-extensible sheet; flexible lagging material bonded to a normally • outer side of said sheet; a layer of flexible elastomeric material bonded to the normally underside of said sheet; and means for fastening said member peripherally to said wall with said elastomeric layer wrapped in torsional stress-supporting mating engagement therewith. 2. The device of claim 1, said member having normally circumferentially spaced edges, and said means being adapted for fastening said member at said edges to said wall. _ 3. The device of claim 2, said sheet being formed of sheet steel of about 16 to 28 gauge. 4. The device of claim 2, said member comprising: an elongated, flat strip having a width designed for side-by-side placement of a multiplicity of strips along the lengthwise dimension of said surface and having a length for wrapping upon and securing to said surface with the length thereof extending circumferentially of said surface. 5. The device of claim 3, said layer being formed on its normally under, wall-engaging, side with a plurality of spaced transversely extending grooves defining spaced wall engaging lands and open passageways there¬ in C _PI between for discharge of lubricant applied as a placement aid to said wall and said underside and expressed from said lands upon securing of said product to said wall. 6. The device of claim 3, said sheet being offset from the center plane of said member to provide a relatively thin protective and wall-gripping elastomeric layer at its normally under, wall-engaging, side and a relatively thick working lamina of elastomeric material at its opposite, outer, side. 7. The device of claim 5, said means securing the circumferentially opposite ends of said member to said wail. . " 8. The device of claim 6, said means comprising rivets. 9. The device of claim 5, and rivets securing the circumferentially opposite ends or said strip to each other. 10. A lagging product for the peripheral wall of a belt pulley, processing roll and the like, comprising: a broad, flat sheet of flexible elastomeric material; and a plurality of flat, elongated, thin, flexible non-extensible members mounted in substantially co-planar, laterally spaced apart and longitudinally coterminous position in a mid-plane of said sheet and bonded integrally thereto; said sheet being severable between said members to provide a plurality of strips each having a width designed for side-by-side placement of a multiplicity of said strips along the lengthwise dimension of said wall and being severable transversely of said members to provide a strip length for wrapping upon and securing to said wall with the length of said strip extending circumferentially of said wall. 11. The product of claim 10, each of said members comprising a flat co-planar strip of sheet steel. 12. The device of claim 2, said means comprising weldable weight metal disposed at said edges. 13. The device of claim 12, said means comprising metal channels fastened on said member at said edges. 14. The device of claim 13, 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 relation to -said laminae and sheet. 15. The device of claim 14, one side of each of said channels being jointly deformed with said sheet into one of said laminae. 16. 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. BUREA __0,V.PI 17. The device of claim 1, said means comprising strips of weldable weight metal adapted for welding to said surface and being secured to said sheet and projecting laterally therefrom and from said lagging material and layer. 18. The device of claim 17, said sheet being composed of sheet metal and said strips being welded to normally circumferentially spaced margins of said sheet. 19. The method of securing to the cylindrical wall ot 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, comprising: applying said member with its elastomeric laminate on said wall; and fastening said member peripherally to said wall with said elastomeric laminate wrapped in stress-supporting mating engagement therewith. 20. The method of claim 19, and applying to said wall a volatile lubricant. er¬ mitting adjustable positioning of said member on said wall prior to said fastening step. 21. The method of claim 20 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. 22. A method of claim 21 wherein said fastening steps comprises rivetting of said ends. 23. The method of claim 19 wherein said sheet is metal and said member is provided at its circumferentially spaced ends with weldaole weight metal and said applying and fastening steps comprise: wrapping said member upon said wall; and welding said weldable weight metal to said wall. 24. The method of claim 20; encasing said circumferentially opposite ends and contiguous layers of said material and laminate within channels providing said weldable weight metal. 25. The method of claim 24; and crimping said channels on said opposite ends and contiguous layers. 26. The method of claim 19 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. 27. The ' method of claim 19, and coating said surface with a latex-base paint and permitting said paint to set prior to said applying said member.

Inventors: HOLZ W
Applicants: HOLZ W
Application year: 1981
Main classification: F16H55
IPC codes: F16H55