Threaded – headed fastener – or washer making: process and apparat – Material supply feeder or distributor
Patent
1997-03-18
2000-01-25
Hail, III, Joseph J.
Threaded, headed fastener, or washer making: process and apparat
Material supply feeder or distributor
470 48, 470176, 470179, 470904, B21H 900
Patent
active
060172754
DESCRIPTION:
BRIEF SUMMARY
This invention relates to production equipment in which elongate, usually small, headed members are to be supplied in succession and have their unheaded ends accurately delivered into receiving means.
This invention has arisen from interest in adhesives, particularly supplying adhesives in containers from which they are readily dispensed, often in small quantities and feasibly successively at intervals over a considerable period of time. It is well known, particularly in relation to containers deformable to express their contents, for a dispensing part, often a spout-like end or nozzle, to have a pierceable seal as first supplied and be formed or adapted to receive a cap. Such dispensing part is often a sub-assembly subsequently itself associated with the adhesive-containing main body part of the container. First usage then involves removing the cap and piercing the seal. Nowadays, the seal is often an applied membrane and the cap can have a formation, then often of a quite shallow conical shape for breaking the seal. An external such formation would be operative after removal and temporary reversal of the cap, with further usages intendedly involving merely removal of the replaceable cap; and good usable condition of container contents relies on a good seal being made by the cap between usages. Internal such formations would be operative for first usage by further movement of the cap onto the dispensing part to break the seal, and the cap removed for each usage and refitted between usages for sealing by its internal formation.
Much older provisions included using a free pin to pierce the end of the dispensing part of the adhesive container, which end could be somewhat thinned but not necessarily or usually to an extent corresponding with more recent provision of a thin membrane. Often, such a pin was further intentionally to serve in resealing the container after use, even be the sole means for doing so, say where no cap was supplied.
Whilst irritatingly easy to lose, and representing prick-injury risks to the user, such pins had a particular potential advantage. Thus, their length can materially assist maintaining an adhesive exit passage clear; and do so relative to an optimally small exit orifice, at least if the pin can be accurately replaced repeatedly without unavoidably opening up that orifice. Accordingly, there is considerable attraction in a cap, perhaps particularly a screw-thread fitting cap, that incorporates an accurately located pin extending centrally internally from the closed end of the cap within and shielded by the confines of its skirt.
An obvious way to make such a cap, which will virtually invariably be of moulded synthetic plastics type these days, is to incorporate the pin at moulding of the cap. However, not only are mould tools more expensive and production rates inherently lower than for single part cap mouldings only, but any inaccuracy of pin placement and/or axial alignment can have a hole enlarging effect at fitting the cap with its integrated pin. This potential hole enlarging effect is inherent for screw-thread fitting caps; and, even within the small tolerances of incorporating mould tools, can be highly disadvantageous as a first-supplied state of adhesive containers. To supply first without penetration of the container by the pin would lead to much greater component lengths and complexity of inter-fitting to allow further axial movement of the cap on the container to achieve penetration, probably inevitably to a compromise by shortening the pin and giving up much of otherwise attractive passage clearing capabilities.
An alternative approach has been identified and investigated in relation to its potential to avoid such disadvantages. This investigated alternative involves inserting a pin through the cap after moulding of the cap, most advantageously also after making the required removable fixing of the cap to the dispensing part of the container. In principle, and as and when achieved successfully in practice, savings in moulding costs are accompanied by avoiding the
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Seymour Geoffrey Francis
Webster David Clark
Hail III Joseph J.
Loctite (Ireland) Limited
Tolan Ed
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