Buckles – buttons – clasps – etc. – Drawstring – laced-fastener – or separate essential... – Having eyelet type directing means
Patent
1995-04-20
1996-12-31
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Drawstring, laced-fastener, or separate essential...
Having eyelet type directing means
247137, 247138, A43C 500
Patent
active
055881912
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an anchoring eyelet for tarpaulins and similar coverings of a thermoplastic foil material, which eyelet is designed as a relatively thin, flat and substantially annular disc of plastic material provided with an eyelet opening.
Tarpaulins of a thermoplastic foil material, possibly with a net reinforcement, is used extensively for covering scaffolding in connection with construction works and for numerous covering purposes, for example for protection of materials and equipment stored out in the open.
For the purpose of fastening to supporting structures or interconnection, the tarpaulins are provided with anchoring eyelets which are pressed into the foil material in direct connection with the extrusion such as is known from international patent application No. WO 91/00801.
The tarpaulin eyelets used so far are shaped as relatively thin and stiff annular discs having a circular, relatively sharp-edged outer periphery.
For tarpaulins with inserted eyelets of this type there may be a certain risk of notch formation at the eyelet edges, partly in connection with the pressing of the eyelets into the foil material, the consequence of which is that at later heavy loads, for example wind loads and tensile influences on the eyelets from the anchor straps, the eyelets risk becoming detached from the foil material.
This problem is remedied according to the invention through a design of anchoring eyelets which are characterized in that the peripheral part of the eyelet disc is designed with indentations to provide increased resiliency to said peripheral part.
For conventional barrel type eyelets intende to be fastened in leather and similar materials by clenching it is known from US-A-872,237 to provide an outwardly turned flange portion forming the head of the eyelet with slots forming a series of petals which can be individually seated in the material to allow an even setting of the eyelet also in presence of a foreign substance on the material.
The design of the peripheral part of the eyelet disc with increased resiliency through the provision of indentations has proved in practice to eliminate or at least highly reduce the above tendency to notch formation, as transversely acting load forces seeking to detach the tarpaulin from the eyelets are substantially transformed into shear forces in the plane of the tarpaulin, because the peripheral edge zone of the disc acts as a supple joint between the relatively stiff middle part of the eyelet disc and the surrounding foil material of the tarpaulin.
The indentations may be designed in various ways. In a very simple embodiment, the increased suppleness may thus be obtained by designing a ring of holes of an arbitrary shape within the periphery of the disc.
However, a preferred embodiment is characterized in that indentations are formed by radially extending resilient tongues or lobes at the periphery of the eyelet disc.
This also entails the further advantage that the external peripheral length of the eyelet discs is increased in consequence of the radially extending Tongues.
The desired resiliency of the peripheral part of the eyelet disc may further be increased by designing further openings in the form of holes in the resilient tongues or lobes.
In comparison with conventional eyelets, which are often exposed to considerable wear at the eyelet opening edge despite their implementation in a relatively stiff material, the increased resiliency of the peripheral part of the disc opens up a favourable possibility of reinforcement of the central part of the disc around the eyelet opening, for example by means of a reinforcing ring.
The anchoring eyelets according to the invention may be pressed into the foil material directly in connection with the extrusion, while the material is still soft, but may also be fastened by heat sealing or adhesion. Independently of the fastening method it may be appropriate for the indentations between the tongues to have a rounded bottom, in order to ensure sturdy sealing to the foil material.
The invention will now be
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patent: 872237 (1907-11-01), Hughes
patent: 2393984 (1946-02-01), Gookin
patent: 3653353 (1972-04-01), Davis
patent: 3979798 (1976-09-01), Meyer
Polysheet A/S
Sakran Victor N.
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