Patent Application
20180055135
The present application is related to Australian Patent Application No. 2009281707 (PCT/AU2009/001039), entitled “Footwear” and filed on 13 Aug. 2009 in the name of Ben Aaron DONALDSON, the entire content of which is incorporated herein by reference as if fully set forth herewith.
The present invention relates to footwear and, in particular to, a shoe having magnets located in the sole for attachment to a metal surface.
Typical footwear includes a vamp or upper that holds the shoe onto the foot of a user and a sole which cushions the impact of a user on a surface. The sole includes an insole which is the interior bottom of a shoe which contacts the user's foot in use and an outsole which is in direct contact with a surface. The midsole is the layer between the insole and the outsole and typically includes shock absorbent material or the like.
Footwear designed specifically for a work environment has increased greatly and now includes features such as a steel cap front portion and/or the vamp being oil, heat or grease resistant, for example. Further, there are many different types of outsoles. For example, hiking boots have a very pronounced grip tread, shoes for ice and rain have been developed and athletic shoes have ranges of outsoles for particular sports.
In the construction industry, many workers climb on scaffolding, structures, roofs or the like and require substantial dexterity not to fall. Many of the roof surfaces can be slippery with little grip being provided. Safety harnesses and barriers have been developed to prevent a workman falling. However, little consideration has been given to the workman's shoes.
Accordingly, there is a need for footwear that provides a user increased grip on a work surface such as a roof and in particular to a roof made of metallic materials.
It is an object of the present invention to substantially overcome or at least ameliorate one or more of the above disadvantages, or to provide a useful alternative.
In a first aspect, the present invention provides footwear having:
a vamp;
an insole;
a midsole; and
an outsole; a plurality of spaced apart magnets located adjacent said outsole so that in use said magnets provide a gripping force between said footwear and a ferrous metallic surface upon which said footwear is placed.
The magnets are preferably embedded in said midsole.
The midsole preferably includes a first surface adjacent said insole and a second surface adjacent said outsole, and a plurality of apertures to receive said magnets extending inwardly from said second surface towards said first surface.
The magnets are preferably circular had have a diameter of between about 30 mm and 45 mm.
Preferably a first magnet is positioned adjacent to a wearer's heel bone, a second magnet is positioned adjacent to where a wearer's proximal phalanx meets the middle phalanx, a third magnet is positioned between the first and second magnets, and a fourth magnet is positioned adjacent to a wearer's toes.
The footwear further preferably comprises a fifth magnet adjacent to the fourth magnet, such that the fourth and fifth magnets are located adjacent to a wearer's toes.
The first, second and third magnets preferably have centre points which are located on a common line.
The magnets are each preferably housed in a ferrous metal housing having a planar base and a cylindrical wall portion defining a receptacle.
Preferably an exposed surface of each magnet is generally in alignment with the end portion of the cylindrical wall portion.
The footwear preferably further comprises a cleaning tool, the cleaning tool having a handle connected to a cup, the cup holding a cleaning tool magnet having a polarity which is opposed to the polarity of each magnet on the underside of the outsole, such that the cleaning tool is attracted to each magnet of the footwear.
The thickness of the outsole rubber is preferably between about 1 mm and 3 mm, and the thickness of the pattern of the rubber is between 1 mm and 3 mm, such that the total thickness of the outsole is between about 2 mm and 6 mm.
A preferred embodiment of the invention will now be described by way of specific example with reference to the accompanying drawings, in which:
According to a first embodiment, there is schematically depicted in the drawings, footwear 1 having a vamp 2, an insole, a midsole 3 and an outsole 4. A plurality of spaced apart magnets 5 are located adjacent the outsole 4 so that in use the magnets 5 provide a gripping force between the footwear 1 and a metallic surface (not shown) upon which the footwear 1 is placed. Preferably, the magnets 5 are located in the midsole 3.
The surface could for example be a metal roof however the invention should not be limited to this use only. The midsole 3 includes a first surface 6 adjacent the insole and a second surface 7 adjacent the outsole 4. A plurality of apertures 8 receive the magnets 5 and extend inwardly from the second surface 7.
In a preferred form, the magnets 5 are embedded in the midsole 3 in the apertures 8. The magnets 5 can be secured in the footwear 1 by any typical fastening means, such as, by use of an adhesive, moulding, snap-fit, interference fit, or the like. In a preferred form, the magnets 5 are located 2 to 10 mm from the second surface 7 and more preferably 2 to 4 mm from the second surface 7. The magnets 5 can be of any shape and in particular rectangular or circular. As best seen in
The present invention at least in a preferred form provides footwear 1 having magnets 5 for use in particular in the construction industry and for use on metal rooves, scaffold or the like. However, it should be appreciated that footwear 1 could also be used on any metallic surface, such as, for skateboarding, bike riding, water skiing, trains, trucks, boats, containers, oil rigs, or the like. Footwear 1 will provide better traction for a user to a metal surface than existing footwear. Safety issues within the construction industry are very important and the footwear 1 is envisaged to provide further security for workers when working at heights and in particular on a roof.
The footwear 1 could also be used on any such surface, for example, on aeroplane wings, trucks, stairs, containers or the like. The magnets 5 should be of sufficient strength to provide a gripping force to resist a user falling from an object or structure and could be tailored to a person's height or weight. The footwear 1 would be a sufficient advantage to a roof worker where the roof is pitched at a considerable angle and the roof material is metal. The footwear 1 could include a range of different size and strength magnets to allow more interchangeability depending upon the surface on which the user is working. It is also envisaged that the apertures 8 are arranged in such a way that the user can arrange the magnets 5 in a particular configuration to suit the work environment.
A second embodiment of footwear 100 according to the invention is depicted in
The grip pattern of the sole of the footwear 101 is depicted in
As shown in
An alternative embodiment is shown in
The footwear of
Each of the magnets 105 is located in a metal housing 120 which is between about 0.5 mm and 2 mm thick. The housing 120 is fabricated from a ferrous metal such as steel. The housings 120 can be seen schematically in broken line in
The apertures 108 which are formed in the midsole 103 are circular and are sized to neatly receive one of the metal housings 120, and the housing 120 may be bonded into the aperture 108 with an adhesive. Each metal housing serves several purposes. Firstly, it has the effect of limiting the magnet 105 attraction or repulsion force in all directions except facing downwardly, toward the outsole 104.
Secondly, during assembly, the metal housings 120 assist to deactivate some of the magnetic force, and this reduces the tendency for the magnets 105 to pop out of the apertures 108, and be attracted to the adjacent magnets 105. This is important as the magnetic force can be dangerous for the workers during footwear 101 assembly, as the magnetic force can cause significant injuries, for example if a finger is caught between two of the magnets 105.
The nature of magnet force dictates that either the positive or negative pole of each magnet 105 will be drawn to a ferrous metal, such as corrugated metal roofing. However, the magnets 105 are all installed in the apertures 108 in the midsole 103 with the polarity facing the same direction. That is, all negatives facing down or all positives facing down. This is done so the outsole 104 of the footwear 101 can be cleaned, as discussed below.
A cleaning tool 130 is provided, as shown in
During use, when a wearer is working on a roof, it is very common that the user's footwear 101 will attract metallic swarf resulting from drilling and grinding processes on the roof. By placing the cleaning tool against the outsole 104, the two magnets 105 will be attracted to each other, and the outsole 104 and swarf will be sandwiched between the two magnets 105. However, the magnet 105 of the cleaning tool 130 is closer to the swarf, and hence will generate a larger attraction force than the magnet 105 within the footwear 101. As such, the swarf will transfer to the cleaning tool 130, and the user can easily scrape the swarf away from the cleaning tool 130 at that time, or at a later stage as desired.
Advantageously, the cleaning tool overcomes the problem of the footwear 101 becoming covered with metallic swarf which may decrease the efficiency of the footwear 101 over time.
In addition, without the cleaning tool 130, the swarf can be difficult to remove from the tread of the footwear 101.
The thickness of the outsole 104 along with any grip on the outsole 104 has a direct influence on the magnetic force, due to the separation between the magnets 105 and the roof surface. Preferably the thickness of the outsole 104 is between 1 mm and 3 mm, and the pattern of the rubber is between 1 mm and 3 mm.
The midsole 103 thickness is determined by the thickness and radius of the magnets 105.
Different magnets 105 may be utilised in the footwear 101, including rare earth, neodymium, iron boron, ceramic, ferrite, pot and samarium cobalt.
The magnets 105 are typically fabricated with an individual holding power of between 25 kg to 80 kg. The magnets are between 30 and 40 mm in diameter, and have a thickness between about 6 mm and 10 mm. The magnets 105 have a magnetisation of between N35 and N52, and are designed to operate at temperatures of up to 80 degrees Celsius. The magnets 105 are preferably nickel plated.
Advantageously, the footwear 101 is designed for use on all ferrous metal surfaces and profiles such as corrugated and flat steel profiles. The footwear 101 operates as normal shoes on other non-ferrous surfaces.
Advantageously, the outsole 104 separates the magnets 105 from the metal surface, thereby protecting the surface from being scratched or damaged by the magnets 105.
Advantageously the footwear 101 may have one or more straps to assist the foot from not moving within the footwear 101. The footwear 101 may be provided with a high cut style for increased ankle support. Alternatively, the footwear 101 may be low-cut for increased flexibility.
The footwear 101 my accommodate innersoles to assist with user specific conditions such as arch support, movement within the footwear 101, user weight and custom orthotics.
Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms.
