US 2224189 A
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Dec. 10, 1940. J. w. LESLIE METALLIC PACKAGE-BINDER STRAP Filed June 12, 1939` a, Qc@
, Patented Dec, 10, 1940 22249189' METnLLrc PACKAGE-Binnen STRAP Joh-n W. Leslie, Chicago, lll., assgnor to Signode lSteel Strapping Company, Chicago, Ill., a cor`A Y poration of Delaware Application June 12, 1939, serial No; 278,681
v 4 claims. -(ci. 2li- 20)` My invention relates to metallic package-binder strap suchl as used for binding individual `packages and for binding groups of lpackages into unitsthe results attained being security, reinforcement, ease of handling and reduction in` damage incident to shipment,
Ordinarily the binders are looped around and tensioned upon thepackage or group of packages and then overlapping portions are securely joined and sealed together to render the encircling loop permanent. Since, the tension is usually applied by a `tool located at one side of a package or group of packages it is important.'
cal examples) that the friction between superposed contacting portions of binder be as low as possible, because such tools provide the tension i 30 by sliding upon and past one another the superposed ends of the binder loops. In order to provide for easy slippage between binder and package and between contacting portions of binder, it has long been the practice to coat such strap 35 with a thin layer or film of anti-friction material or lubricant, such as parai'line. Not only does the paraine provide the easy-slippage property, but italso protects the strap against moisture and prevents rusting.
"40 On the' other hand, where the union or joint between the overlapping end portions of the tensioned binder loop is produced by crimping those portions together more or less edgewise-such,
. for example, as set forth in Flora Patent No.
45 1,252,680, in Leslie Patent N0. 1,445,330, or in Porter-Patent No. 1,969,152-much of the joint strength depends upon the amount of friction existent between the binder surfaces which are in most intimateor close contact with each other 50 within the joint, viz., in the edge regions where the principal deformation and closest engagement exist. n v
Thus, inshort, the surface characteristics de- K siredofpackage-binder strap are low friction for `1.55 tension and high friction for strength of crimped joints. Attempts have been made to provide binder. strap possessing these two diverse, notto say antagonistic, properties, but so far as I am aware there hasl not been heretofore proposed any satisfactory practical solution of the problem. As a matter of fact, the common practice 'of entirely coating binder strap with paraiiine or other lubricant in order to decrease the friction with the package, and thereby the better to distribute the tension, has Va rather marked joint-weakening effect.`
' The object of my invention is to provide a metallicbinder strap which, to an adequate extent, will po'ssess both low and high surface friction.`
Another object is to provide a strap having these dual characteristics and which lends itself to practical commercial production.
Inv general, my improved strap has a longitudinally `disposed area-preferably centrally disposed relative Vto the edges--of relatively low coefficient of surface friction and a longitudinally disposed edge area-preferably along both edges-of relatively high coefficient of surface friction.
In the drawing:
l Fig. 1 is a plan of a portion of binder embodying my invention, and
Fig. 2 is a top plan of a typicalv joint of the edgewise folded or crimped variety. ,30
I have found that if only the central longitudinal area of one surface of the strap is coated with a thin lm of anti-friction material or lubricant such as parafiine orother suitable substance of low friction coefficient, the desiredA easy-slippage characteristic of strap entirely coated. with lubricant is not at all seriously im-y paired. For all practical purposes it slips about package corners and upon itself as easily as a completely lubricated strap.
I have also found that if the coefficient of surface friction is high in only the .regions bordering the strap edges, the strength of crimped joints is very materially increased and yet the easyslippage property is not materially reduced. 'I'he 45 width of the area of high surface friction coefficient to give thebest results will depend upon the depth of edgewise crimp employed.' It` should be wide enough so that the major part of the high-friction surface in the region of the 50 edgewise crimp will be embraced Within the crimp where the overlapping strap portions are mostY tightly pressed together.
In practice I have found that with a strap 5/8" wide good results are obtained if the paraf- 55 wheel partly immersed in a bath of the para'ne.
heated to liquefaction or bya brush. Instead of applying the paraffine hot it may be cut or thinned to the proper consistency by suitable and well known solvents, such as naphtha. When so applied, the evaporation of the solvent will leave the solici parafline in a very thin film upon the `surface of the strap. y Y. l
The relatively high surface-coefficient stripes 6 along the edges of the strap may be provided in various ways. Thusthese edge ystripes may be provided by oxidizing or sand blasting, or otherwise roughening the strap surface. As a matter of fact, for hot rolled strap, the oxidation of surface normal with this method of production will, under some conditions, lprovide the desired high frictionparticularly as the .surface becomes scaly during the deformation of `iointproduction. `Or they. may be provided by coating the edge areas with asuitable high friction'substance, such as resinous paints, of which shellac is ran example. l Coating the edge areas is preferable to oxidizing or Sandblasting because-like the lubricant-it can serve as a weatherproof protection.
When a strap of `dual surface characteristics, such as heretofore described, is looped and drawn tight about a package or group of packages the low friction or lubricated area provides easy slippage over the package surfaces and, if tensioning tools of the type herenbefore mentioned are used, between the superposed strap end porthe marginal areas will be obtained by treatment of only one side of the strap. For other purposes, it will be desirable to obtain greater efliciency in tensioning properties and in joint strength and `both sides of the strap may be treated.
Having thus illustrated and explained the nature and an embodiment of the invention, what I claim and desire to secure by United States Letters Patent is as follows:
l. A metallic package binder strap having a flat unbroken surface with a longitudinally disposed arca of high surface friction and a longitudinally disposed area of low surface friction.
2f A metallic package binder strap having a fiat unbroken surface with a centrally disposed longitudinal stripe of low surface friction and an edge stripe of high surface friction.
3. A metallic package-binder strap having one of its flat unbroken surfaces longitudinally and centrally striped with a lm of lubricant, which retains its place under ordinary conditions, and its edgesv treated to provide high surface friction. i
4. A metallic package-binder strap having one of its flat unbroken surfaces centrally and longitudinally coated with a lubricant, which retains its place under ordinary conditions, and along the edges coated with aY high friction substance.