Patent Application
20200170355
The present invention relates to an eyelet for a flexible sheet such as a tarpaulin, canvas, foil or linen. More specifically, the present invention relates to an eyelet having improved means for integration with a flexible sheet such as a tarpaulin, canvas, foil or linen.
Large flexible sheets such as a tarpaulin, canvas, foil or linen are used for a wide range of things and they often need to be fastened during use. An example of a flexible sheet is a tarpaulin which is widely used to cover articles in freight vehicles or warehouses or to cover scaffolds and construction works, so that such articles are protected from rain or sunshine. Generally, a tarpaulin is secured by securing elements such as e.g. ropes, strings, hooks or the like, but due to the risk of tearing, eyelets are provided in corners and/or along edges, allowing for the ropes or strings to pass through. Thus, the eyelets provide a reinforcement of the tarpaulin where the eyelets are positioned.
Typically, such large flexible sheets are made from a synthetic material, e.g. PVC or other polymers. Most importantly, the tarpaulin is made of an appropriate material for the intended use. During the manufacturing process, holes are punched out for receiving the eyelets.
Known eyelets include metal eyelets made from e.g. aluminium, brass or steel and hard plastic eyelets, both made by using an upper mould and a lower part. Commonly, a metal eyelet comprises a lower cylindrical body and an upper disc, the lower cylindrical body having a bottom plate and a cylinder placed upwardly on the bottom plate. The upper disc has a generally round ring formed in the intermediate portion thereof, the round ring being concave at the inside thereof, and further has a flange turned over around the outer periphery thereof. After the hole for the eyelet is formed in the tarpaulin fabric, the lower cylindrical body and the upper disc are coupled in said hole in a procedure similar to rivets. As a result, the lower cylindrical body and the upper disc are formed as an integral body with each other and mounted on the tarpaulin fabric. The securing element, which is used for fixing the tarpaulin fabric, is passed through the inside of the hole formed in the centre portion of the eyelet, such that the tarpaulin fabric can be fixed to a given object.
Generally, the hard plastic eyelet has the same structure as the metal eyelet, except that a plurality of protrusions of a predetermined thickness are formed in a shape of a circle on the top surface of the bottom plate of the lower cylindrical body and on the bottom surface of the upper disc. The protrusions are inserted into the tarpaulin fabric upon coupling of the eyelet with the tarpaulin fabric, thereby achieving the rigid attachment of the eyelet to the tarpaulin fabric.
However, such conventional types of eyelets have several disadvantages. Most importantly, due to conventional eyelets comprising two bodies being coupled, a risk of subsequent detachment is present. Further, since conventional eyelets rely on the clamping of the tarpaulin between the two bodies, the force by which said bodies are coupled is critical. However, one cannot couple the bodies by a force exceeding the breaking points of the materials constituting said bodies, and as such, is limited by the material choice. Further, conventional eyelets are likely to tear the tarpaulin if pulled, as the eyelets may considered a foreign object in the tarpaulin with a low degree of integration. Finally, the size of conventional eyelets is considerable, as these rely on the before-mentioned two bodies.
The object of the invention is to solve some of the above-mentioned problems. According to the invention, an eyelet for a flexible sheet is disclosed, the eyelet forming a generally round loop having a central aperture suitable for receiving a securing element. The eyelet is characterised in that it further comprises a metal body comprising a cylindrical section comprising a first end and a second end, where the first end is provided with a radially extending first flange extending towards the second end, and where the second end is provided with a radially extending second flange extending towards the first end, such that a partly confined space is formed by the first and second flange and the cylindrical section. Further, the eyelet comprises a plastic body enclosing the metal body, whereby said plastic body is securely joined to the metal body due to plastic at least occupying the partly confined space, and wherein the plastic body comprises a radially extending plastic flange, thereby providing means for joining the eyelet to the flexible sheet.
By an eyelet is meant a device providing means for reinforcing a flexible sheet, such as a tarpaulin, canvas, foil or linen, at points where a securing element such as a rope or hook is to be mounted or passed through. The eyelet forms an opening, which can be of any shape, such as e.g. a circular or square having a central aperture. Thus, the eyelet may be considered ring-shaped. The eyelet is to be mounted in a hole in the flexible sheet, such that a securing element being e.g. a rope may be passed through the central aperture and thereby through the flexible sheet. By a rope is meant any type of rope, string, or wire commonly used to attach a flexible sheet to an object. Alternative securing means could be a hook or similar that can be fastened to the aperture of the eyelet.
By metal body is meant an element made of a metal, e.g. aluminium, titanium, steel, brass or other metals commonly used in the field of eyelets. By a cylindrical section is meant that said section generally defines the shape of the eyelet, especially the size of the central aperture. Thus, the cylindrical section is open ended, such that a rope may pass through. Thus, the first end and second end of the cylindrical section is to be understood the terminating ends of the cylindrical section.
By the first and second ends being provided with a first and second radially extending first flange is meant that said flanges extends from the first and second end of the cylindrical section, respectively, and outwards, away from a central axis coinciding with the extension of the cylindrical section. Preferably, the metal body is made from a single piece of metal, where the flanges are formed in a stamping/punching procedure, such that said flanges and central section are integral. By being made of a single piece of metal, the flanges and cylindrical section are considerably stronger than flanges attached onto said cylindrical section by means of e.g. welding. However, one realises that such embodiment is likewise possible within the scope of the invention. Thus, by the term “provided with” is meant that the flanges may either be stamped out from a single piece of material, or be attached the cylindrical section, e.g. by means or welding. In an embodiment, the first and second flanges are provided about the entire circumference of the cylindrical section.
By the first flange extending towards the second end is meant that said flange is bent generally towards the geometrical plane defined by said second end. By the latter is meant that the second end of the cylindrical section generally lies in the same geometrical plane, the plane preferably being normal to the central axis. Thus, the first flange generally extends towards this geometrical plane, but said first flange may be wave shaped, box shaped, straight and angle, partly circular, etc., along this extension. However, the general extension of the first flange is generally towards the second end or the plane defined by said end. For example, the free end of the first flange is positioned at a point between the first end and the second end, or the geometrical planes thereof as understood from the above disclosure. In certain embodiments, the angle formed between the flange and an outer wall of the cylindrical section may be acute, whereby the condition of the extension towards the second end/the geometrical plane defined by said second end is met. In other words, the first flange does not extend the entire way towards the second end. Preferably, the first flange has a length between 5 mm and 30 mm, or more specifically between 8 mm and 20 mm.
Likewise, by the second flange extending towards the first end is meant that said flange is bent towards the geometrical plane defined by said first end. By the latter is meant that the first end of the cylindrical section generally lies in the same geometrical plane, the plane preferably being normal to the central axis. Thus, the second flange generally extends towards this geometrical plane, but said second flange may be wave shaped, box shaped, straight and angle, partly circular, etc., along this extension. However, the general extension of the second flange is generally towards the first end or the plane defined by said end. For example, the free end of the second flange is positioned at a point between the first end and the second end, or the geometrical planes thereof as understood from the above disclosure. The second flange may be U-shaped in cross section in a preferred embodiment, such that the cylindrical section terminates in said flange being bent to form the U-shape, the free end of the U-shape then extending towards the first end and the first flange, the latter being a result of the first flange extending towards the second end. In a preferred embodiment, a projection of the second flange onto the outer wall of the cylindrical section covers 10% to 90% of said wall, or more specifically between 10 and 60%. Thus, the first and second flanges extend towards each other. However, and preferably, said flanges do not cross or touch. In other words, a gap remains between the first and second flanges.
Due to the first and second flanges extending towards each other, a partly confined space is formed about the circumference of the metal body. Thus, the partly confined space is defined by the first and second flanges, the outer wall of the cylindrical section, and the gap between said flanges.
According to the invention, the metal body is enclosed in a plastic body. Thus, the plastic body covers/encapsulates the metal body. Preferably, the plastic body is casted in one piece, e.g. in a procedure wherein the metal body is disposed in a casting mould and molten plastic is added, such that said plastic encapsulates the metal body according to the shape of the mould. The inner wall of the cylindrically section of the metal body may remain free of plastic, or plastic may cover this wall as well. Most importantly, plastic occupies the partly confined space as previously defined, since plastic is allowed to enter this space through the gap between the first and second flanges.
The plastic body further comprises a plastic flange. Preferably, this plastic flange is shaped during the above-described casting procedure, thereby providing the plastic body with an integral plastic flange. The plastic flange is a radially extending flange disposed around the eyelet, such that the entire eyelet (metal body and plastic body combined) is rotationally symmetric about the central axis. The plastic flange should at least extend further than the first flange and/or second flange. Preferably, the flange has a thickness between 2 mm and 6 mm, but may be either thinner or thicker depending on the size of the entire eyelet and as such, the intended use.
The plastic flange of the plastic body provide a means for attaching a flexible sheet to the eyelet by means of welding, melting, gluing or fusion of the two materials. Thus, it is understood that the plastic flange is made of a material being weldable/fusible with a flexible sheet, likewise being made of such a material. Most plastics/polymers provide this opportunity, e.g. PVC.
Thereby, the eyelet experiences an improved inherent strength through the metal body being made in one piece of metal, and an improved attachment between the plastic body and the metal body through the provision of a partly confined space defined by the provision of flanges extending towards each other. Further, the eyelet provides a means—through the provision of an integral plastic flange—for attaching a flexible sheet to the eyelet by means of welding, melting, gluing or fusion of the two materials. Thereby, the eyelet may be considered an integral part of the flexible sheet. The ability to be welded with the flexible sheet increases the strength significantly compared to conventional eyelets. Further, the welded region—the plastic flange—is securely fastened to the metal body through the plastic body further occupying the partly confined space defined by the flanges of the metal body, and as such is less likely to detach or tear the flexible sheet compared to conventional eyelets.
In an embodiment, the first and second flanges and the plastic flange may be rotationally symmetric about a central axis of the eyelet. Alternative shapes could be oval, square, and triangular.
By a central axis of the eyelet is meant a central axis coinciding with the extension of the cylindrical section of the metal body, i.e. a central axis passing through the central aperture of the eyelet.
Thereby, all flanges are disposed along the entire circumference of the eyelet, which improves the strength and increases the welding region.
In an embodiment, the first flange may extend further away from the cylindrical section than the second flange.
Thereby, the first flange overlaps the second flange. Thereby, the gap formed between the two flanges is asymmetric when seen from the side of the eyelet, i.e. normal to the outer wall of the cylindrical section of the metal body. Thereby, detachment of the plastic body from the metal body is less likely to occur in the plane where a flexible sheet is to be welded to the plastic flange. In other words, a pull in the plastic body in a direction normal to the outer wall of the cylindrical section is less likely to cause a detachment from the metal body. One notices that the described direction is the most common direction in which a pull may occur once a flexible sheet is attached.
In an embodiment, the second flange may be substantially U-shaped in cross section.
By a U-shape is meant that the first leg of the U terminates in the central section of the metal body, and that the second leg points towards the first end and as such the first flange. Thus, the flange is integral with the metal body. In certain embodiments, the end of the second leg of the U may be directed towards the outer wall of the cylindrical section, such that plastic occupying the partly confined space becomes further contained within the U-shape.
Thereby, the plastic body may occupy the U-shape, thereby increasing the resistance to detachment.
In an embodiment, the plastic flange may extend further away from the cylindrical section than the first flange.
In other words, the plastic flange is furthest away from the central axis.
Thereby, the plastic flange may be easily welded/fused with a flexible sheet within affecting the thicker metal body.
In an embodiment, the plastic flange may be planar.
In other words, the plastic flange extends in the same plane. Preferably, said plane may coincide with the plane of the first or second end, whereby the plastic flange forms a base of the eyelet.
Thereby, a flexible sheet may be attached the eyelet in the same plane across said eyelet.
In an embodiment, the plastic flange may comprise ribs.
By ribs is meant surface features/corrugations increasing the surface area of the plastic flange. The ribs may extend radially away from the central axis. Alternatively or additionally, the plastic flange is provided with a ring-shaped rib extending along the circumference of said plastic flange.
Thereby, a flexible sheet may be even more strongly welded with the plastic flange. Especially,
Further, the invention relates to a flexible sheet comprising an eyelet according to previous disclosures.
The eyelet is disposed in openings in the flexible sheet and welded along the plastic flange of said eyelet.
Thereby, a flexible sheet comprising a welded eyelet is provided. Due to the welding, the eyelet is strongly attached the flexible sheet, thereby decreasing the risk of tearing if the flexible sheet is exposed to a pull, e.g. due to wind.
In the following, example embodiments are described according to the invention, where
In the following the invention is described in detail through embodiments thereof that should not be thought of as limiting to the scope of the invention.
The metal body 110 comprises a cylindrical section 119 comprising a first end 111 and a second end 112. The first end 111 is provided with a first flange 113 and the second end 112 is provided with a second flange 114. The flanges 113,114 are radially extending, meaning that they extend radially in a direction away from the central axis C of the eyelet 100.
The first flange 113 extends in a direction towards the second end 112. In certain embodiments, this may be described through the angle V formed between the first flange 113 and the cylindrical section 119. In such certain embodiments, said angle V is acute. The second flange 114 extends in a direction towards the first end 111. In other words, the first flange 113 and the second flange 114 extend towards each other. In certain embodiments, the cross section of the second flange is U-shaped. In other embodiments, the direction of the second flange 114 may be described through the angle W formed between said second flange 114 and the cylindrical section 119. In such other embodiments, said angle W is acute. Thus, the first flange 113 and the second flange 114 define a partly confined space 115 due to said flanges 113,114 extending towards each other. A gap G is formed between the flanges 113,114 allowing the plastic of the plastic body to enter the partly confined space. One notices that the first flange 113 is longer than the second flange 114. Such difference in lengths introduces an asymmetric arrangement of the flanges, such that the gap G is not disposed symmetrically between the first end 111 and second end 112 of the metal body 110. This asymmetry reduces the risk of detachment between the metal body 110 and plastic body 120 in cases where said plastic body 120 is pulled in a direction being normal to the outer wall 116 of the cylindrical section 119.
A plastic body 120 (hatched,
Thereby, the plastic flange 121 may be welded/fused with a flexible sheet in cases where said plastic flange 121 and said flexible sheet are both made of a fusible material, e.g. plastics, such as polyethylene. Due to the plastic body 120 being an integral body enclosing the metal body 110, likewise being an integral body, the eyelet 100 experiences a significant strength compared to conventional eyelets. Especially, due to the plastic of the plastic body 120 occupying the partly confined space 115 defined by the first 113 and second flanges 114, a disconnection between said plastic body 120 and the metal body 110 is unlikely.
| Number | Date | Country | Kind |
|---|---|---|---|
| 18209388.0 | Nov 2018 | EP | regional |
