Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1996-09-27
1998-08-11
Walsh, Donald P.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
2426091, 2426094, 2426134, 156 91, B65H 7514
Patent
active
057915881
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a metal-free disposable drum intended for a continuous flexible object and having a diameter within the interval 200-1200 mm, consisting of a cylindrical, form-stable sleeve with parallel end surfaces and with a predetermined inner diameter Dhi, two circular end elements and two central plugs with a central aperture for a shaft member for winding and unwinding the object, each end element having a central aperture to receive the sleeve, the end element and central plug being arranged to receive between them and firmly clamp the end portion of the sleeve to form a friction joint, the central plug having a leading expansion part arranged to expand the sleeve upon axial insertion of the central plug into the sleeve, and an adjacent friction part arranged to produce friction engagement with the sleeve after full insertion of the central plug into the sleeve, and to cooperate with the end element arranged radially outside it so that the sleeve is firmly clamped by friction engagement between the central plug and the end element, the expansion part and friction part together having an axial dimension that is 50-200% larger than the thickness of one end element. The invention also relates to a method of manufacturing such a metal-free disposable drum.
It is known to use disposable drums with a size of 400 mm, this dimension referring to the diameter of the end pieces. The disposable drums are designed in such a manner that the joint between the end pieces and the sleeve forming the core is not sufficiently strong to be used for sizes larger than 500 mm. Wooden drums of conventional type are therefore still used for these sizes. However, such wooden drums are expensive and must therefore be re-used in order to make the handling of cable and line more economical as a whole. However, the return system functions most unsatisfactorily, thereby making the handling of cable and line less economical. Another drawback is that the end pieces of the wooden drums, made of layers of planks nailed together, are easily damaged. Such damage to the timber constitutes considerable risk to the people, who often have to handle the drums under difficult conditions, as well as the actual cable or line easily becoming damaged as it is being uncoiled from the rotating wooden drum, particularly if the cable or line is running from the coil in a direction not perpendicular to the axis of rotation of the drum. The damage may be so serious that the entire coil of cable or line or parts thereof must be discarded. Interruptions also occur, i.e. the work of lying cables or lines are delayed. Another problem with wooden drums is that the center of rotation does not usually coincide with that of the sleeve and therefore not with the central axis of the coil either. This is extremely unsatisfactory and entirely unacceptable for opto-cable, for instance, which is very sensitive and may easily be damaged as a result of being out-of-line during coiling or uncoiling. Deformation caused by the nature of the timber (not dead material) and faults or difficulties in manufacturing the wooden drums contribute to the effect making the drums out-of-line. One suggestion for reducing this problem has been to replace the wooden drum core formed of planks with a sleeve of iron. However, this suggestion does not solve all the problems and also creates new problems such as increased weight and increased cost.
It is also desirable to be able to burn an inexpensively manufactured drum without any metal waste remaining. It has so far been impossible to satisfy this desire in the case of the sizes under consideration here, viz. up to 1200 mm, since the drums are assembled using various metal parts such as nails and bolts.
Another problem is that a drum supplied is not utilized to its full capacity since customers order smaller quantities of a cable, etc. than the drum can hold and there is usually no other suitably sized drum in the standard range, for the length ordered. It is therefore also de
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Rivera William A.
Ulvator AB
Walsh Donald P.
LandOfFree
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