|Publication number||US3910558 A|
|Publication date||Oct 7, 1975|
|Filing date||Feb 13, 1974|
|Priority date||Feb 13, 1974|
|Publication number||US 3910558 A, US 3910558A, US-A-3910558, US3910558 A, US3910558A|
|Inventors||Brucker Henry J, Brucker Robert J|
|Original Assignee||Kinedyne Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (39), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 11 1 1111 3,910,558
Brucker et al. Oct. 7, 1975 54] HEAVY DUTY WINCH FOR CARGO 3,428,331 2/1969 Morgan et al. 105/369 A TIE DOWN 3,533,588 10/1970 Cregier 248/361 A v 3,697,045 10/1972 Farley 254/5l  Inventors: Henry J. Brucker, Summit; Robert J. Brucker, Basking Ridg both Primary Examiner-Robert J. Spar Assistant ExaminerKenneth Noland  Assignee: Kinedyne Corporation, 1 Attorney, Agent, FirmHarry Rook Mountainside, NJ.
22 Filed: Feb. 13, 1974 1571 ABSTRACT  Appl NOJ 442,114 The tubular drum of a winch, for example, in a cargo tie-down apparatus, has a cylindrical outer surface and a longitudinal slot through which one end of a strap 105/369 A extends into and is secured in the drum, and the longi- [Sl] Int. Cl. B66]? 19/00 tudinal edge of said slot over which the strap is drawn Field of Search 5 51, during winding of the strap on the drum is disposed 254/1 186 105/369 24/68 CD, inwardly of said cylindrical surface. Desirably, a con- 248/361 2 /719, 1 R; 117 vex curved surface of small curvature along said edge merges gradually into said cylindrical surface. The inl References Cited vention eliminates or reduces to the minimum the pos- UNITED STATES PATENTS sibility of fraying or cutting of the strap by the slot 1,175,698 3/1916 Brooks 254/161 edge, and the strap during Winding thereof is capable 1,272,944 7/1918 Green 254/161 Of withstanding extremely high teflsimls Over long P 2,506,029 5/1950 Maasdam..... iods of time.
3,099,055 7/1963 Huber 3,409,263 11/1968 .lantzen 105/369 A 2 Clam, 13 Drawmg F'gures U.S. Patent Oct. 7,1975 Sheet 1 of3 3,910,558
US. Patent Oct. 7,1975 Sheet 2 of3 3,910,558
Sheet 3 of 3 3,910,558
US. Patent Oct. 7,1975
HEAVY DUTY WINCH FOR CARGO TIE-DOWN BACKGROUND OF THE INVENTION This invention relates in general to cargo tie-down devices of the type which includes a flexible binder such as a chain or a relatively wide web, strap or band of nylon webbing or steel webbing, having its ends connected to a vehicle bed and its intermediate portion drawn tightly over a load on the bed, at least one end being wound on the drum or spool of a winch that is secured on the bed, for tightening the strap over the-load. The loads generally are large and high and therefore the binder must be maintained under extreme tension, for example, 10,000 pounds to hold the load firmly on the bed, and chains have been required to connect the binder to the winch drum although it is more desirable to use webbing if feasible.
In common prior art constructions utilizing a fabric web or strap, the spool or drum has a cylindrical and tubular body in which a straight longitudinal slot parallel to the body axis and of a length greater than the width of the webbing or strap through which one end of the strap extends into the drum, and there is means connected to the strap inside the drum to prevent the strap from being pulled out of the slot as the strap is wound on the drum. The outer edges of the side walls of the slot lie in the cylindrical peripheral surface of the drum body, and during use of winch, when the strap is pulled under tension over a load the edge of the slot over which the strap is drawn causes fraying or cutting of the strap.
This construction leaves much to be desired in that it cannot be relied upon to perform its intended function; the strap is short-lived and even when new, it is liable to break under relatively low tension, for example, of the orderof 4 or 5,000 pounds. Moreover the construction is not satisfactory for use in installations in which the strap must withstand higher tensions of, for example, 8,000 to l0,000 pounds and more.
SUMMARY OF THE INVENTION A primary object of the invention is to provide a winch spool or drum of the general character described embodying a novel and improved construction which overcomes the objections to and disadvantages of the prior art devices, which is reliable in operation, longlived, and in which the possibility of fraying or cutting of the strap by the edge of the web slot in the drum is eliminated or reduced to the minimum and the strap 'during winding thereof on the drum is capable of withstanding extremely high tension.
In the winch spool or drum of the preferred form of the invention, the edge of the web slot over which the strap is drawn during winding of the strap on the drum, is disposed inwardly of the cylindrical peripheral surface of the drum and there is a convex curved surface extending from said edge of the slot outwardly of the drum and gradually merging into the cylindrical surface of the drum. Preferably, the portion of the drum adjacent said edge of the slot is depressed or bent inwardly of the drum to so locate the slot edge and form said convex curved portion.
BRIEF DESCRIPTION OF THE DRAWINGS I For a complete understanding of the invention,'referenceshould be had to the following description in conjunction with the accompanying drawings in which mentarily with the tie-down strap wound on the winch drum in out-of-use position;
FIG. 3 is a detached side elevational view of the winch drum showing the web slot embodying the invention;
the plane of the line 3A3A of FIG. 3;
FIG. 4 is a fragmentary transverse vertical sectional view taken approximately on the plane of the line 44 of FIG. 2;
FIG. 4A is a greatly enlarge d fragmentary transverse sectional view of the winch drum and the strap wound thereon as shown in FIG. 4;
FIG. 4B is a fragmentary longitudinal sectional view approximately on the plane of line 4B4B of FIG. 4;
FIG. 5 is a vertical sectional view on the plane of the line 55 of FIG. 2 showing the winch in end elevation;
FIG. 6 is a fragmentary side elevational view illustrating another manner of mounting the winch on a trailer body;
FIG. 7 is a vertical sectional viewapproximately on the plane of the line 99 of FIG. 7; g
FIG. 8 is a schematic view showing the winch drum in a longitudinal section and illustrating the manner of attaching the end of the strap to the winch drum in a winch fixedly mounted on the trailer body as shown in FIGS. 6 and 7;
FIG. 9 is a detached respective view of a support element for attaching the winch to the trailer body.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Specifically'describing the invention, the reference character A designated a elongated substantially flat deck, floor or body of a transport vehicle, for example, a trailer of a motor truck, which is shown only fragmentarily. In accordance with the general practice, a load B is placed on the trailer body and tied or held against movement on the deck by one or more tie-down straps I each of which has one end connected to any suitable means, for example, a rub-rail 2, or a stake, or an anchor ring secured to the deckat one side of the load, while the other end of the strap is wound or tightened on a winch generally designated C at the other side of the load.
In the present instance, the winch is shownas comprising a U-shaped frame mounted on a rail D on the vehicle deck and having a bottom or main portion 3 and parallel arms 4 in and between which is journaled a winding spool or drum 5 on which the strap is wound during rotation of the drum in one direction.- As shown, one end of the drum projects outwardly beyond one of the arms 4 and has a plurality of transverse openings 6 to receive a handle pin E shown by dot and dash lines in FIG. 5 for rotating the drum. Of course, other means may be utilized for rotating the drum to wind and unwindthe strap thereon. To prevent accidental backward rotation of the drum, the other end of the drum FIG. 3A is an enlarged transverse sectional view on 3 has rigidly secured thereto a ratchet 7 with which operates a pawl 8 pivoted at 9 on the arm 4 of the frame and normally urged by gravity into engagement with the I ratchet as shown in FIG. 5. Desirably the pawl has a finger lug 10 for lifting the pawl out of engagement with the ratchet when that is desired.
The invention is particularly concerned with the constrap is in the form of webbing of known construction,
for example, sling-weave nylon or polyester of a width of the order of 1% inches to 3 inches and capable of withstanding tension of the order of from 10,000 to 16,000 pounds.
The winch drum has a straight longitudinal web slot 11 parallel to the axis of the drum through which one end of the strap extends into the drum. As shown, the said end portion of the strap is returned upon the main portion of the strap and stitched thereto as indicated at 12 so as to form a loop 13. The loop is inserted into the drum through the .slot 11 and is held against being pulled out by suitable means, for example, by either the shank 14 of a bolt having a head 15 at one edge of the strap and a nut 16 on the other end at the other edge of the strap (see FIG. 4, 4A, 4B and 9) or by a pin 17 having enlarged end portions 18 and 19 at opposite edges of the strap as shown in FIG. 8. The head, nut and enlarged end portions preferably are greater in diameter than the loop so that when the strap is placed under tension during the winding of the strap on the drum, said'head and nut,- or the enlarged end portions, as the case may be, are drawn into contact with the inner surface of the drum and prevent the pulling of the strap out of the slot (FIGS. 4, 4A, 4B and 9).
As usual, during the winding of the strap it is drawn over one longitudinal edge of the web slot, and in accordance with the invention said edge of the web slot which is designated 20 is disposed inwardly of the outer cylindrical peripheral surface of the drum (see FIGS. 3A, 4 and 9) and there is a convex curved surface 21 that extends outwardly of the drum from said edge of the slot and gradually merges into the cylindrical surface of the drum as indicated at 22. The portion of the drum adjacent said edge of the slot may be depressed or bent inwardly of thedrum to locate the slot edge as above described and to form said convex curved portion. FIGS. 3 and 3A show the slot, the depressed slot edge andtheconvex curved portion without the web. The con'vex curved portion is in effect eccentric to and of a smaller degree of curvature than the cylindrical surface of the drum.
It has been found that with the slot fomied in the winch drum in accordance with the invention, the possibility of fraying or cutting of the strap by the edge 20 ofthe web slot is eliminated or reduced to the minimum, and the strap during winding thereof on the drum to tie down a load on the trailer body is capable of withstanding extremely' high tension without breaking or cutting of the strap at the slot edge. We believe this re; sult is achieved because due to the depression of the slot edge 20 and the difference in curvature between the portion 21 and the cylindrical surface of the drum, the second convolution and following convolutions of the strap during winding thereof exert only slight pressure on the first convolution at the slot edge. See FIG. 4A. Also, we believe that the first convolution frictionally grips the convex curved portion in closely spaced relation to the slot edge so as to prevent the increasing tension on the convolutions as the strap is wound, from being transmitted to the area of the strap that lies on the slot edge. I
In the form of the invention shown in FIGS. 1 through 5, the winch is adjustable longitudinally of the trailer body. The rail D has a base 23 from which extends spaced apart side flanges 24 which have inwardly projecting portions 25 and the frame of the winch is slidably mounted between said flanges and has recesses 26. receiving said inwardly projecting portions in slidable relation thereto. The bolt or pin can be easily inserted through the belt loop from one end of the winch drum in this structural combination where the ends of the drum are freely accessible, but difficulty may arise when the ends of the drum are not easily accessible as shown, for example, in FIGS. 6 and 7. Here the winch frame F is installed in a box-like structure 26 that is weldedin an aperture 27 in the chassis G of the trailer body, and it is extremely difficult to insert a bolt or pin into the strap loop that is inserted through the aperture 27 and through the strap slot 11 in the drum from the outer side of the chassis. I
FIG. 8 shows schematically a method to facilitate the insertion of the pin into the strap loop. One end of a flexible cord 28 is looped and tied through a hole in the, enlarged end portion 18 and the other end of the cord is inserted into one end of the drum 5, then outwardly through the strap slot, then through the strap loop 13, backwardly through said slot and out of the other end of the drum shown in FIG. 8. Then the second mentioned end of the cord is pulled so as firstly todraw the straplloop into the drum and secondly to pull the pin into the loop.
The winch embodying invention makes itpossible to utilize a known type of strap formed of fabric or webbing, for example, a standard nylon strap, in a cargo tie down apparatus so as withstand high tensions of the order of ten thousand to sixteen thousand pounds for long periods of time without serious fraying or breaking surface andthere being an exterior curved surface extending convexly from said edge of the slot eccentric to and gradually merging into said cylindrical surface thereby to reduce the possibility of fraying of the strap by said edge of the slot.
2. The combination of a frame, a tubular drum journaled to rotate in said frame and having a cylindrical outer surface and a longitudinal slot extending radially strap is disposed inwardly of said cylindrical surface and there is a convexly curved surface that extends outwardly from said edge and merges gradually into said cylindrical surface thereby to reduce the possibility of fraying of the strap by said edge of the slot.
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|US1272944 *||Mar 1, 1917||Jul 16, 1918||Percival Green||Cable-clamp.|
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|International Classification||B60P7/08, B60P7/06|