Receptacles – Container attachment or adjunct – Handle – handle component – or handle adjunct
Patent
1995-03-15
1996-06-18
Castellano, Stephen J.
Receptacles
Container attachment or adjunct
Handle, handle component, or handle adjunct
220268, 220756, 220763, 220771, B65D 2532
Patent
active
055269540
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an injection-moulded plastic bucket with a bottom, a wall expanding conically from there to the upper edge, and with a carrying handle, where the upper edge of the wall is provided with receiving elements for a carrying handle at diametrically opposite points, consisting of outward-projecting pins, integrally moulded on the upper edge, the ends of the pins being provided with securing elements to prevent the carrying handle eyes from slipping off laterally and each being encircled by a carrying handle eye connected to the carrying handle.
Plastic buckets of the type mentioned above are generally manufactured by mass production. If the carrying handles are manufactured separately from the buckets, their attachment necessitates a substantial outlay, as this requires an additional handle-fitting operation which involves additional automatic handle-fitting machines.
For this reason, attempts are being made to manufacture carrying handle and bucket in a single operation. To this end, unexamined German application 35 40 059 describes a bucket with an articulated bow-type handle which is retained in integrally moulded handle-retaining cages on opposite sides of the bucket by means of knobs on the ends of the handle.
This type permits manufacture of the bucket in one piece, this being achieved by means of a mould comprising not only the mould halves generally familiar in moulds, but also several slides for forming the handle-retaining cages and the handle knobs.
During moulding, two slides are required on each side, these being laterally inserted into the space for the handle retaining cages in order to mould the knobs. In addition, two slides have to be used on each side to mould the undercuts on the handle knobs.
The disadvantage of this known solution is that the slides required for forming the handle-retaining cages and the handle knobs require a major technical effort and result in very high mould costs. Furthermore, it is impossible to refit the mould, for instance in the event that buckets without handles are to be manufactured because a metal handle needs to be used.
A further known solution is disclosed by U.S. Pat. No. 4,125,246, which describes a mould for a plastic bucket which provides for the handle of the plastic bucket to be moulded in the parting surface between female mould and male mould. Outward-projecting pins are integrally moulded on the upper edge at the locations of the receiving elements. The pins are each encircled by a carrying handle eye connected to the carrying handle.
The ends of the pins are provided with securing elements to prevent the carrying handle eyes from slipping off laterally and the pins are hollow on the inside.
In this context, the securing elements are realised in that the pins either have external projections or are conically extended. The shape of the pins necessitates forced demoulding, i.e. the internal cavity is generated by a mandrel-like mould element and the outer contour of the pin by a sleeve-like mould element, the inner form of the sleeve producing the later outer contour of the pin.
The type of bucket known from the U.S. Pat. No. 4,125,246 either requires plastic deformation in order to achieve demoulding, on the one hand, and to realise a securing element on the end of the pin, on the other hand. The fact that this plastic deformation remains necessary means it is necessary to await precisely that moment in time when the compound is still just capable of plastic deformation. This will lead to quality problems in practice, because the disturbance variables affecting this condition are manifold.
Another design necessitates elastic demoulding where plastic deformation is undesirable. This increases the waiting time before demoulding as it is necessary to wait until the state of plastic deformability has been passed with certainty. Furthermore, the forced demoulding step generally requires two motions. Either the inner part, i.e., the mandrel, must be removed first, followed by the outer part, i.e., the sleeve, or vice versa. In any
REFERENCES:
patent: 2895522 (1959-07-01), Bloch
patent: 3861840 (1975-01-01), Heisler
patent: 3889732 (1975-06-01), Wilkins
patent: 4125246 (1978-11-01), Von Holdt
patent: 4172577 (1979-10-01), Von Holdt
patent: 4476083 (1984-10-01), Von Holdt
patent: 4632357 (1986-12-01), Von Holdt
patent: 4998622 (1991-03-01), Drack
patent: 5027973 (1991-07-01), Drogos
Castellano Stephen J.
Jokey Plastik Wipperfurth GmbH
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