Receptacles – End wall structure – Joint or seam between sidewall and end wall
Patent
1997-05-06
1999-12-07
Castellano, Stephen
Receptacles
End wall structure
Joint or seam between sidewall and end wall
220617, B65D 632
Patent
active
059968354
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a barrel with a tubular body and two end faces at the opposite ends of said body, which body and end faces are made of a plastic material and are fixed to each other by welding or gluing.
BACKGROUND OF THE INVENTION
Such a barrel is described in Application NL-A-9301856 (not a prior publication). The body of this known barrel has a radially outward pointing body flange, on which a corresponding ridge of an end face is welded. When this barrel is being lifted up with a lifting device, the major part of the lifting forces is exerted on the body flange. During this, the welded joint between said flange and the ridge of the end face is hardly affected at all by said lifting forces.
The join between the body and the end face of said barrel is in the form of a butt joint. Such a welded joint is not so suitable for the transmission of tensile forces. Since, as explained above, this welded joint is not placed under any load by lifting forces, the risk of giving way as the result of said lifting forces is low.
Such a butt joint has the disadvantage that during manufacture it must be ensured that the ridge and the flange are positioned correctly relative to each other. Besides, the butt joint is still vulnerable as regards other loads, such as shock loads arising from dropping the barrel, internal excess pressures and so forth.
SUMMARY OF THE INVENTION
The object of the invention is therefore to provide a barrel which does not have these disadvantages. This is achieved through the fact that at at least one of its ends the body is a gradually widening or narrowing shape, and the respective end face has a correspondingly shaped edge which is fixed to the gradually widening or narrowing end of the body.
The advantages of the join between the body and the end face of the barrel according to the invention are twofold. First of all, such a fixing is an overlapping join, which has the advantage that the loads are transmitted by means of shearing forces, and not by tensile forces such as above. The fixing between the body and the end face according to the invention is therefore equipped for transmitting the lifting forces, which means that no special body flange is necessary in this respect, as is the case in the known barrel.
Moreover, the end face can be a constant thickness, in other words the peripheral edge thereof can be the same thickness as the central part thereof. This means that it is also possible to manufacture the end face by means of vacuum forming. Besides, such a design leads to less distortion and fewer irregularities.
Despite the constant thickness of the end face, a thickness which is necessary for correctly lifting up the barrel is still obtained at the edge of the barrel, due to the combined thicknesses of end face and body in their regions which are welded to each other.
In addition, the manufacturing process is considerably simpler, given the fact that the gradually widening or narrowing shapes of the body and the end face make them self-centering with respect to each other. It is also sufficient to press these parts towards each other in the axial direction. Moreover, when they are moving towards each other the gradually widening or narrowing body and end face do not touch each other until they are practically in the correct position relative to each other. This means that hardly any shearing movements occur on the interacting surfaces of the body and the end face, which leads to a better join.
The welded joint has a relatively large surface area, which makes it less critical. Even a poorer welded joint would function adequately, in view of that large area and the low stresses arising therefrom.
According to a first preferred embodiment, the end widens out in the direction of the outside of the body, and the outer periphery of the edge of the end face is connected to the inner periphery of the gradually widening end of the body.
In order to provide a suitable lifting means, the edge of the end face bears a peripheral apron which surrounds the ed
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Farrington Edward James
Van Keimpema Gerrit Jan
Castellano Stephen
Koninklijke Emballage Industrie Van Leer N.V.
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