Abstract: For the connection of two edges of areal parts which extend at least along one common section essentially parallel to one another, at least one retaining element is arranged at the one edge which form-lockingly engages from behind, as viewed in the edge direction, in a recess in the other edge. At least one projection arranged laterally offset at the one edge in relation to the retaining element in the direction of the engagement from behind, abuts form-lockingly at the part with the recess essentially in the edge direction. For the connection of the terminal edges of open ends of a ring-shaped clamping band, analogously a retaining tongue is provided, preferably in the center of the one edge with lugs projecting on both sides from the tongue which form-lockingly engages from behind in an essentially congruent recess in the other edge also arranged essentially centrally.

Abstract: A controlled tension limited diameter clamp is disclosed which can be closed and opened with conventional pliers. Working faces are positioned on the external surface of the clamp which can be gripped by pliers. The working faces are conveniently formed by die cutting and raising the edge of the metal.

Abstract: An earless clamp structure to which elastic stretchability is imparted by one or more clamping band sections which essentially consist of lateral band portions converging toward one another from each end of the section. The lateral band portions define therebetween a window-like opening resembling an hourglass. The method in accordance with the present invention involves the step of removing certain material portions from the clamping band to obtain a section with non-rectilinear lateral band portions.

Abstract: A binding-up band for use in fastening articles having remarkable shrink properties such as cotton or the like has at its ends locking structures which are adapted to fit one in the other in a complementary manner. In this locking structure, a plurality of raised engaging portions each having a wide portion and narrow portion are provided in a row in the longitudinal direction, and these raised engaging portions are formed by providing a sufficient number of pairs of symmetrical bent cuts in the band and pressing out these cut-provided portions to be of a trapezoid-like shape in longitudinal cross-section.

Abstract: In a hose clamp having a resilient clamp body (2) substantially annularly surrounding one hose end and having tightening ends (6, 7) that overlap one another and are bent substantially radially away from the clamp body (2), in which a certain inside diameter prevails in the relaxed state, and the clamp body (2) can be spread apart to a considerably greater diameter counter to its own spring force with the aid of a tightening tool engaging the tightening ends (6, 7), and one tightening end (6) is embodied as an inverted U and the other tightening end (7) is embodied in protrusionlike fashion and is disposed between the U legs of one tightening end (6) with its free end approximately at the radial height of the crossbar of the U of the one tightening end (6), and the one tightening end (6), for forming a shackle (8), is bent back toward the other tightening end (7) substantially at a tangent or in a circumferentially curved manner, at a certain radial distance from the clamp body (2), and the tightening ends (6

Abstract: This invention relates to a clamp comprising a metal band wound on itself, of which one of the ends is shaped as a hook and of which the other end presents a projecting lug allowing the free edge of the hook to be fastened. The lug presents a boss on its face serving as bearing for the free edge of the hook after fastening, this boss preferably being located substantially in the middle of the width of the lug, while the free edge of the hook comprises a notch whose shape is complementary to that of the boss of the lug.

Abstract: A substantially cylindrical shaped metal clamp suitable for joining co-axial pipes, is disclosed and outlined. Said clamp is made from a base strap which is bent in two positions rather close to its ends, one of said bends developing on a non-radial axis and having the end near the other bend, which may be also a radial one, extending for a short straight line having an open bend end which, on locking, hooks on to the non-radial bend close to the other end of the clamp.The base strap forming the clamp has two wide wave shaped laps which, because adjacent, give the strap an `m` shape, said `m`-shaped portion, which is lightened by a central lengthwise slit, is situated at the strap end bearing the straight hooking arm.

Abstract: A clamping device is provided in the form of a one-piece cable tie. The cable tie includes a band section having a free end for positioning about an object to be constrained, such as an electrical cable, and a buckle section through which the free end of the band section is inserted. In a preferred embodiment, the buckle section includes a first portion operatively connected to the band and terminating adjacent a slot. A second, raised portion of the buckle section is longitudinally or horizontally offset from the first portion. The second portion extends from a point adjacent the aforementioned slot to a free end. The width of the slot occupied by the band is greater when the band is loosely wrapped about the object constrained. The greater width of the slot when the band is loosely wrapped facilitates single or multiple wrappings of the object constrained.

Abstract: This invention relates to a clamp, adapted to be dismounted and re-used, constituted by a metal band wound on itself, comprising respectively in the vicinity of each of its ends, on the one hand, two radial stops directed outwardly of the band to constitute complementary tightening means adapted to be gripped by a tool of the pliers type, on the other hand, complementary joining means generally in the form of hooks which, in the non-tightened state of the clamp, are at a distance from each other. Each assembly of a tightening means and of a joining means is constituted by a portion of metal band of which the two ends are suitably bent to form the stop and the hook, said band portion being independent of the band constituting the clamp and being fixed thereon by any appropriate means.

Abstract: A strip of polymeric sheet material adapted to cut into lengths to form releasably engageable pieces of a fastener. The strip has a row of tab-like parts bent along bend lines out of the plane of a main part of the strip to define an opening through the strip; and the main part and tab-like parts of the strip have adjacent edge surfaces disposed at an included angle in the range of about 60 to 90 degrees with respect to the adjacent bend line so that when the tab-like parts on each of two lengths of the strip are simultaneously fully inserted through the openings in the other length with the tab-like parts projecting generally in opposite directions, the edge surfaces of the tab-like parts on one length will make frictional engagement with the edge surfaces of the main part of the strip on the other to frictionally hold the lengths in releasable engagement.

Abstract: An elongated connector comprises a flexible, lengthwise elongated, strap-like body having generally C-shaped cross-sections in planes crosswise to the length dimension of the body, with body opposite ends configured to yieldably nest; and teeth may be provided to be outstanding from and spaced apart on the body, the teeth configured to mesh into valleys formed by the body when the body is deformed in a loop and opposite C-shaped end portions of the body are nestably interfitted.

Abstract: A hose clamp made from a unitary, spring steel band formed into a generally cylindrical configuration. The clamp has a support piece extending radially outwardly from one end of the spring steel band, a slot opening formed in the one end adjacent the support piece and extending a predetermined length in a circumferential direction of the spring steel band, a projecting piece formed at the other end of the spring steel band and fitting in circumferential relationship in the slot opening, and an upstanding tab formed at the distal end of the projecting piece and extending radially outwardly of the spring steel band. With this arrangement, when the spring steel band is deflected to its expanded position, the tab is retained on the support piece so as to temporarily lock the spring steel band in its open or expanded position.

Abstract: An anti-theft collar device for an automobile or other vehicle having a cylindrical steering wheel and an extending shift lever. A resilient, arcuate band includes a first end having a member extending therefrom curled radially inward to form a first end slot, a second end, an opening spaced from the first end, and an aperture to accommodate the shift lever therethrough. A tongue extends circumferentially from the second end and is adapted to be inserted through the opening in the band. The tongue terminates in a member curled radially inward to form a second end slot parallel and opposed to the first end slot. A wedge has a pair of opposed edges that may be slidably received in the slots and a wedge lock prevents removal of the wedge from the slots. The arcuate band may be formed around the cylindrical steering wheel column, the tongue may be inserted through the opening in the band to form a pair of parallel, opposed slots.

Abstract: An improvement in a sealless connection between two overlapped segments of strapping. The sealless connection comprises a plurality of joints arrayed longitudinally, each comprising a pair of shoulders, which interlock when the segments are tensioned. The connection further comprises notches provided respectively in superposed edges on opposite sides of the respective segments and operable as an "anti-reverse" locking means. The notches are provided after the shoulders are interlocked. The segments are formed at the notches to prevent the segments from shifting longitudinally to unlock the interlocked shoulder. The notched edges of the respective segments are uninterrupted, except for the notch, where the respective segments are crimped.

Abstract: A circular spring clamp comprises a spring steel band having a reentrantly folded latch hook at one end and a radially outwardly extending latch at the opposite end with a concave latching surface thereon. The band has radially outwardly extending flanges on opposite edges thereof for guidance and retention of the latch hook.

Abstract: Clamp of the type comprising a band, provided close to one of its ends with raised sections and having at its other end a lug equipped with means for fastening said raised sections. Said fastening means are constituted for example by a screw, of which the threads are engageable with said raised sections, and the lug is fixed on one end of a first piece of band, which first piece is in turn fixed on a second piece of band on the end of which are provided the raised sections.

Abstract: A clamp band has a pair of end portions formed in a loop-like shape around a cylindrical clamp member mounted on a member to be clamped and overlapped with each other and imparted a tangential clamping force and engaged with each other to clamp the clamp member to the member to be clamped.

Abstract: A hose clamp (1) having a spring-loaded clamping body (2) encircling the end of the hose in a generally circular manner, and overlapping clamping ends (6, 7), where in the released state a defined inner diameter -clamping state- exists and the clamping body (2) can be spread to a considerably larger diameter against its inherent spring force by a spreading tool acting on the clamping ends (6, 7), which can be manipulated during operation without a special spreading tool because in the spread-open state of the clamping body (2) the clamping ends (6, 7) can be locked against each other and can be unlocked from each other for clamping a hose end.

Abstract: A band clamp having an integral buckle includes an elongated band; a buckle member at one end of the band and having a base in the plane of the band, side portions and a top portion connecting the side portions forming a loop for retaining one or more passes of the band; and a tongue member extending in the plane of the base opposite the band, a pair of notches extending into the base at the sides of the tongue. When tension is applied the band with the band extending through the buckle and enclosing the sleeve, the tongue member is deflected toward the sleeve by the band for permanently deforming the base and portions of the sides of the buckle in conformity with the sleeve when the sleeve has an equivalent diameter of less than about 20 times the thickness of the band.

Abstract: The invention relates to a clamp constituted by a band of metal comprising, at each one of its ends, complementary tightening and/or fastening means, whereas the inner end of the band comprises an extension which goes beyond the corresponding fastening means, under the outer end of the band.In this clamp, the transversal edge of the band, which constitutes the free end of the extension, has a profile indented into the band, such as an .OMEGA.-shaped profile, whereas close to its outer end, and on this side of the corresponding tightening and/or fastening means, said band comprises an elongated boss, which projects from its inner face, and is adapted to penetrate into the indented profile of the free end of the extension, said boss having its maximum height substantially equal to the thickness of the band.

Abstract: A cable tie comprises a metal plate 1 from which projects a metal strap 2. After the strap has been passed around a bundle of cables to be held together the free end 7 of the strap is fed below a pair of lugs 10 and 11 and a bridge portion 3 and is then bent back over the bridge portion 3. Finally, the free end portion 7 is manipulated below the lugs 10 and 11 by first sliding one edge of the strap below the lug 10 so that it can then pass beyond the outer edge of the lug 11. When the strap is moved to lie in the normal longitudinal position it will be held securely below the two lugs 10 and 11. The lugs 10 and 11 are displaced longitudinally and their supports may also be directed outwardly as shown. An additional upstanding lug can be provided opposite the lug 11 to help to prevent undue lateral movement of the end of the strap 2.

Abstract: A clamp constituted by a band of metal wound over itself and comprising at one of its end, called outer end, and close to the other end, called inner end, complementary fastening means, the metal band being extended, beyond the fastening means situated at the inner end, by a part which, in the unfastened position of the clamp, spreads between the two fastening means, clamp wherein the inner end of the band ends into a bent-up part, generally shaped as an outwardly directed T, whereas the outer end is provided, at the back of its fastening means, with a longitudinal slot of which the width is at least equal to that of the vertical bar of the T.

Abstract: A reuseable open type clamp comprising an arcuate-like strap having two generally opposing, spaced ends, each of which has been bent outwardly of the general periphery of the clamp, to form first and second ears with one of the ears having an aperture therein and the other of the ears having a projection thereon extending outwardly from its respective ear, with the projection being adapted to be received in the aperture in the closed condition of the clamp, to hold the strap in closed clamping condition. Removal of the projection from the aperture enables the clamp to spring to open position due to the nature resiliency of the strap portion.

Abstract: A clamp structure with a clamping band having open ends and a mechanical interconnection of the open ends of the band that include at least two outwardly extending hooks in the inner band portion adapted to engage in apertures in the outer band portion; at least one of the hooks is a cold-deformed support hook and another one of the hooks is a generally circumferentially extending combined guide and support hook which has an inclined guide and support surface operable to initially engage with the corresponding aperture in the outer band portion so as to guide the inner and outer band portions toward one another while at the same time absorbing circumferentially directed tightening forces until the cold-deformed support hook becomes effective in also absorbing tightening forces by engagement of its abutment surface with the corresponding aperture.

Abstract: A flexible C-shaped band with a pliers engagement opening at each free end. The openings are in alignment with the center axis of the band. An elongated handle extends transversly from the band longitudinal axis.

Abstract: A pipe saddle has a detent closure including a detent in the vicinity of one end of a saddle body and a detent support in the vicinity of the other end of the saddle body cooperating with the detent when in a closed position. The detent support is located in the vicinity of a passage receiving the detent. The detent is located in an edge portion cut out of the end of the saddle body and curved inward. To provide a detent facing radially inward at least in the fastened state of the pipe saddle, a detent recess is provided separate from the passage. The recess has an edge on which the detent can be supported. The detent recess is arranged in the vicinity of the part of the saddle body lying on the periphery of the pipe saddle.

Abstract: A locking ring formed of a plurality of curved clamp portions connecting in an end-to-end relationship for securing an electrical power measuring device with a mounting base is disclosed. The semi-circular clamp portions are molded from a single piece of plastic, are identical in construction and are fully interchangeable. Each clamp is preferably formed with a semi-circular curved arc body having a male connection at one end and a female connection at the other end. The male end is formed with a pair of projections of which the first male projection serves as an alignment guide during make-up and use while the second male projection carries a movable latch shoulder for effecting the end-to-end connection with the adjacent mating clamp portion. The female end includes a housing having a central opening with separated first and second entrances formed by a roof mounted lug.

Abstract: A hose clamping device has a steel clamp band adapted to be tightened around an elastic hose in a ring-like form such that its opposite ends overlap each other. A tightening mechanism is provided on a portion of the band near the underlying end thereof and adapted to pull or push the overlying end, thereby tightening or loosening the band on the hose. A stopper is provided on a portion of the band ahead of the overlying end and is adapted to be contacted by the overlying end, so as to stop the advance of the same. The stopper is constituted by a tab-like portion cut out from a portion of the band and raised in such a manner that the upper surface thereof faces the advance of the overlying end, so as to be pressed down by the overlying end when the latter is pulled by the tightening means. Any excessive tightening by the tightening mechanism only causes the stopper to bend towards the cut out by the pressure applied by the overlying end of the band.

Abstract: A clamp structure with a clamping band having open ends and a mechanical interconnection of the open ends of the band that include at least two outwardly extending hooks in the inner band portion adapted to engage in apertures in the outer band portion; at least one of the hooks is a cold-deformed support hook and another one of the hooks is a generally circumferentially extending combined guide and support hook which has an inclined guide and support surface operable to initially engage with the corresponding aperture in the outer band portion so as to guide the inner and outer band portions toward one another while at the same time absorbing circumferentially directed tightening forces until the cold-deformed support hook becomes effective in also absorbing tightening forces by engagement of its abutment surface with the corresponding aperture.

Abstract: A separable fastener of the press-on/pull-off types comprises similar first and second fastener members, each member including a base having a plurality of tapered projections extending from one face surface and a plurality of tapered receptacles recessed into the face surface. Projections and receptacles are positioned in identical patterns and spacings, each projection and receptacle being totally surrounded and isolated by a portion of the base material. The projections on each fastener member are contoured to engage in the receptacles of the other fastener member with a releasable friction fit.

Abstract: In a two-fold type tying device formed of synthetic resin, guide portions 4B in the form of a projection are provided at a portion to be contacted by a rocking arm of a tying machine. This tying device is capable of preventing release of the tying device from the rocking arm or bending member upon tying the tying device by means of the tying machine 15, preferably with the aid of the guide portions 4B and guide slots 4C.

Abstract: A unitary, flexible, and resilient clamp for applying clamping forces to the exterior surface of objects such as coolant hoses, tubes, or the like. The clamp has a generally arcuate cross-sectional configuration and includes a flexible band in the form of an open ring having opposed end portions and defining an inner arcuate portion. A first band end is connected to a first end portion of the flexible band and includes at least three inwardly projecting extensions. A second band end is connected to the opposite end portion of the flexible band and includes at least two extensions projecting inwardly towards the extensions of the first band end and configured to matingly engage therewith.

Abstract: A tire and antiskid net for vehicle tires, particularly for tires of heavy earth moving machines, has a plurality of vertical members arranged to extend substantially normally to a tire surface, a plurality of ring-shaped connecting members of a limited length engaging the vertical members and arranged to extend substantially parallel to the tire surface, and a plurality of sleeve-shaped closure members fitted onto the ends of each connecting member in their abutting position so as to hold together the abutting ends of each of the connecting members.

Abstract: Clamp of the type constituted by a wound-over metal band, a first end of which is provided on its external face with an oblong patch of transversely extending scores or teeth, the width of said patch being preferably less than that of the band, whereas the second end is provided with a fastener joined to the band and wound over crosswise thereof on the outside of the band to provide a passage for the first end. The two ends of the fastener cover one another on the outside of the band and are assembled by a bent strip of metal of which the side facing the band is provided with scores or the like, extending crosswise to the band and designed to cooperate with the scores or teeth of the first end of the band.

Abstract: A clamping device for clamping a split heat-shrinkable sleeve placed around the joint between the core conductors of two communication cables which are to be joined or spliced together. The sleeve has two upstanding lugs or flanges on either side of the split in the sleeve. The holding strips are placed against the outer surface of the lugs. Each strip consists of two foldable link assemblies joined to opposite ends of a straight, rigid center portion or line. A connecting rod is initially inserted through sleeves on each strip to keep the strip straight during placement against the lugs. Clamping springs are rotatably mounted on one strip, and, after placement of the strip, the springs are rotated over both strips, thereby forcing the lugs into contact with each other. The rods are then removed.

Abstract: An integral and inexpensive tying or bundling clamp device is disclosed, together with the method of applying the same. The clamp comprises a metal band having at one end an anchor defined by a series of convolutions of the band wrapped to provide a passage for the free end of the band. The device is applied by encircling an article and passing the free end through the passage and tightening the band while applying a reacting pressure against the convolutions, whereby the same are caused to constrict and frictionally to retain the band in the anchor.

Abstract: A clamp structure especially for use in applications in which space conditions do not permit any projecting parts such as plastically deformable ears, and in which outwardly extending hooks adapted to engage in apertures are used to mechanically interconnect the clamp structure; to enable tightening of the band about an object to be fastened, cold-deformed pressed-out embossments are provided in inner and outer band portions, which extend generally in the circumferential direction so that each pressed-out embossment remains integral at least on both sides thereof, where the tool-engaging surfaces thereof are able to withstand very large tightening forces in the circumferential direction which permit a secure tightening of the clamp structure.

Abstract: The clamping-band is equipped with a split inner ring with an eccentric bore. A rigid inner half-collar partially surrounds the inner ring by means of runners forming with the ring a ball and socket device, and terminated on one side by one securing tab. A rigid outer half-collar partially covers the inner half-collar and terminates on one side in a second securing tab. The two securing tabs are equipped with oblong holes which are facing for the purposes of securing and clamping the collar.

Abstract: This invention relates to a radially expandable locking sleeve device and to a gasket apparatus for providing a fluid tight seal between a pipe and a porthole in the wall of a manhole riser. The gasket is in the form of a tubular element of elastomeric material. An annular recess is provided in the inner surface of the gasket near one end for receiving a radially expandable split sleeve having interlocking end portions. The outer circumferential surface of the locking sleeve is so arranged as to continue uninterruptedly across the area of the interlocking end portions, and the end portions when engaged lock against both lateral displacement and circumferential collapsing of the sleeve.

Abstract: This invention relates to clamps of the type utilized on aircraft and aircraft power plants that anchor the various tubes associated therewith and are characterized by including a bulbous section in a standardized clamp that serves to relieve the high stresses that otherwise cause breakage and looseness.

Abstract: A crimp-type hose clamp wherein the ends of the clamp are joined in a double-layered top portion of the hat section of the clamp.

Abstract: A longitudinally divided cable sleeve characterized by a strip-like sleeve member which is composed of a heat-shrinkable material and has two longitudinal edges with reinforcing inserts to form first and second edges with reinforced portions, and coacting closure elements for joining the edges together with the elements on the first edge being bent from strips of material and having a head portion that is received in a slot or opening in the second edge. Preferably, each of the elements bent from a strip of material has a link portion, which is received in a slot of the first edge up to an abutment surface and a projecting closure part which is inserted through the opening of the second edge is provided with a latch element to prevent accidental and unintentional disassembly of the closure elements after the projecting closure part is inserted through the opening of the second edge.

Abstract: A split sleeve of a shrinkable material having closure elements comprising projections and apertures for receiving the projections adjacent each edge characterized by the projections being integral tabs which are cut out from a portion of the sleeve and folded along the line inclined to the edge of the sleeve. To improve the stiffness of the longitudinal edges, reinforcing members may be partially embedded adjacent each edge with the closure elements formed therein or entirely embedded in the material of the sleeve member with the enclosure elements formed therein.

Abstract: A banding strap for attaching a heat shield to a muffler comprises a strap for encircling the muffler and heat shield, the strap including an underlying end segment and an overlying end segment, each including outwardly projecting shoulder sections providing abutments for crimping to interlock the end segments and tighten the strap around the muffler and heat shield. The outwardly projecting shoulder section in the overlying end segment forms an inwardly opening bight for receiving the outwardly projecting shoulder section in the underlying end segment. Each shoulder section includes an inwardly projecting indentation so that the indentation of one of the shoulder sections nests within the indentation of the other of the shoulder sections when the shoulder sections are engaged to prevent lateral misalignment of the end segments with respect to each other.

Abstract: This disclosure relates to a retainer strap for use in holding together and/or supporting wires, hoses, ropes, or the like. The strap comprises a head portion and a tail portion. The head portion is comprised of a section of the strap folded substantially onto itself so that two spaced-apart apertures in this portion of the strap are substantially aligned with one another. The tail portion is adapted to be inserted through the apertures in the head portion to form a loop of adjustable size. After being looped, the retainer strap may be placed in either holding or locking configurations. No tools are required to either install or lock the strap of the present invention.

Abstract: The clamp of the invention comprises a strip of flexible material formed at the ends with tongues which can be engaged with one another when the clamp is fitted around a tubular or bar-like object. One end is formed with at least one set of three tongues consisting of a short tongue flanked by two long tongues the tips of the long tongues being bridged by a fixed bar and the other end is formed with at least one tongue engageable over the bar and under the short tongue of the tongues of the other end. The strip of flexible material may consist of two portions hinged to one another.

Abstract: An ovalized cross-sectional shaped bale-tie wire for use in baling materials includes a body portion and engaging looped members formed at each end of the body portion. The process for manufacturing an ovalized cross-sectional shaped bale-tie wire includes the steps of withdrawing round wire from a wire drum, straightening the round wire, passing the straightened wire through an ovalizing mill to form the ovalized cross-sectional shaped wire, accumulating the ovalized cross-sectional shaped wire, controlling the length of the wire by predeterminely cutting the wire preforming simultaneously the engaging looped members on the trailing end of the leading bale-tie wire and the leading end of the trailing bale-tie wire and bending the looped end portions out of the plane of the body portion of the bale-tie wire.

Abstract: A structural assembly comprising a preformed connecting member and a tubular member to be integrally connected in surrounding relationship by said connecting member without requiring separate fastening means for effecting such connection. The structural assembly is particularly well adapted to be joined with similar structural assemblies into an elongated solar energy absorber panel structure. The connecting member and the tubular member are held in virtually inseparable engagement with each other with the connecting member surrounding and generally conforming to the outer peripheral shape of the tubular member by deformable sections of the connecting member which define interengageable locking means comprising strut lock shoulder and tooth sections. Deformation of the shoulder and tooth locking means into progressive contact ensures inseparable connection of the connecting member with the tubular member.

Abstract: A metal strap segment is provided for forming a loop about compressible material and has a first joint-forming portion on one end and a second joint-forming portion on the other end, each of the joint-forming portions containing an array of longitudinally spaced joint elements which are adapted to interlock to form a sealless strap connection when the joint-forming portions are overlapped. An abutment is provided at the distal end of the second joint-forming portion and a disengageable anti-reverse engaging means, such as a tab or receiving aperture, is provided on the first joint-forming portion. The engaging tab or aperture is located, with respect to the distal end of the first joint-forming portion, inwardly of and adjacent the array of longitudinally spaced joint elements.

Abstract: A sealless strap connection is provided between a first and second overlapped length of strap and comprises an array of longitudinally spaced joints with each joint comprising lengthwise opposed protuberances displaced from their respective planes of the overlapped lengths of strap and interlocked with each other. The protuberances on the first length of strap are longitudinally spaced in a first and second group with the protuberances of the first group equally spaced from each other and with the spacing of the adjacent protuberances of the second group progressively increased in the direction away from the first group. The protuberances on the second length of strap are longitudinally spaced in first and second groups with the protuberances of the first group equally spaced from each other and with the spacing of the adjacent protuberances of the second group progressively increasing in the direction away from the first group.