Patent Application
20220381036
The present Application claims the benefit under 35 U.S.C. ยง 119 of Applicant's earlier filed Australian Provisional Patent Application No. 2021901592 filed on May 27, 2021. The contents of the specification accompanying the Applicant's prior application are to be considered incorporated herein by reference.
The present disclosure is broadly directed to a wheelchair access ramp and a method of forming a wheelchair access ramp. In particular, the present disclosure is directed to an access ramp including an exposed slip-resistant surface suitable for wheelchair and pedestrian traffic.
According to a first aspect of the present disclosure there is provided a wheelchair access ramp including a base layer adapted for placement of the access ramp, an adhesive layer applied to the base layer, the adhesive layer being effective in promoting adherence to the base layer, a grit material deposited across the adhesive layer to provide a slip-resistant surface, and a sealing layer applied across the slip-resistant surface providing a sealed slip-resistant surface exposed for wheelchair and pedestrian traffic across the access ramp.
In aspects, the adhesive layer may be a primer coating applied to the base layer. In certain aspects, the primer coating may be a water-based coating.
In other aspects, the base layer may be a composite mixture including rubber blended with polyurethane. In certain aspects, the rubber may include a combination of synthetic and natural rubbers such as that sourced from recycled tyres. In other aspects, the rubber may be in the form of crumbs or granules of a predetermined particle size distribution.
In aspects, the sealing layer may include a resinous material and is of a relatively low viscosity. In certain aspects, the low viscosity resinous sealing layer may be effective in keying to the slip-resistant surface including the grit material.
In other aspects, the grit material may be coupled to the base layer via the intermediate adhesive layer. In certain aspects, the grit material may be granular and may include natural or synthetic oxides, carbides, and silicates including but not limited to silicon dioxide in the form of quartz such as sand, aluminium oxides, silicon carbides, and silicates in the form of garnets.
In accordance with another aspect of the present disclosure there is provided a method of forming a wheelchair access ramp, the method including applying an adhesive layer to a base layer, the adhesive layer being effective in adhering to the base layer, depositing a grit material across the adhesive layer to provide a slip-resistant surface, and applying a sealing layer across the slip-resistant surface to provide a sealed slip-resistant surface exposed for wheelchair and pedestrian traffic across the access ramp.
In order to achieve a better understanding of the nature of the present disclosure a preferred embodiment of a wheelchair access ramp together with a method of forming a wheelchair access ramp will now be described, by way of example only, with reference to the accompanying illustrations in which:
As shown in
In this embodiment, the wheelchair access ramp 10 generally comprises:
In this embodiment the adhesive layer 14 is a primer coating applied to the base layer 12. The primer coating 14 is typically a water-based coating which functions to promote adherence or coupling of the grit material 16 to the base layer 12.
The base layer 12 of this embodiment is a composite mixture including rubber blended with polyurethane. The rubber is typically in the form of rubber crumbs or granules of a predetermined particle size distribution. The rubber crumbs are derived from recycled tyres and as such include a combination of synthetic rubbers and natural rubbers. The rubber granules may be obtained from buffing material from tyre buffing.
The base layer 12 of this embodiment makes the largest contribution to the bulk of the access ramp 10. The base layer 12 is of a relatively dense construction having a typically density of around 830 kg/m3. This means the access ramps such as 10 are relatively heavy and as such generally do not require mechanical anchorage for secure placement in temporary or permanent installations. The relatively heavyweight access ramps such as 10 can nonetheless be moved with relative ease, for example to place in storage when not in use.
The sealing layer 20 may include a resinous material and is of a relatively low viscosity. In this example the resinous sealing layer 20 being of a low viscosity has the capability to flow for both (i) sealing of the slip-resistant surface 18, and (ii) keying with the grit material 16 in providing the sealed slip-resistant surface 22. The sealed slip-resistant surface 22 thus provides slip-resistant properties complying with the relevant regulatory Australian and/or New Zealand Standards providing access ramps such as 10 with improved stability and weather resistance. Samples of the slip-resistant surface 22 when tested using Slider 96 under the relevant Australian Standard exhibit a mean Slip Resistance Value (SRV) measured in accordance with the British Pendulum Number (BPN) of around 58 with a spread of SRVs between 55 and 60. It will be understood that these SRVs achieve a slip rating of P5 being the highest possible rating.
In this embodiment the grit material 16 is granular and includes natural or synthetic oxides, carbides, and silicates. The grit material may be sourced or derived from sand wherein it is in the form of silicone dioxide or naturally occurring quartz. The grit material also extends to synthetic oxides and carbides such as those adopted in other applications requiring slip-resistant properties where for example aluminium oxides and silicon carbides are used.
In a further embodiment, there is a method of forming a wheelchair access ramp such as 10. In the context of the access ramp 10 of the preceding embodiment this method broadly performs the steps of:
In embodiments, the method initially comprises moulding or otherwise fabricating the base layer 12 from a composite mixture including rubber crumbs blended with polyurethane. The moulded base layer 12 typically includes rubber crumbs derived from recycled rubber such as recycled tyres.
The method of this embodiment may involve:
In view of the embodiments described herein, it will be apparent to those skilled in the art that the wheelchair access ramp has at least the following advantages:
Those skilled in the art will appreciate that the embodiments of the present disclosure are susceptible to variations and modifications other than those specifically described. For example, the materials from which the various layers are constructed may depart from the described embodiments provided they remain broadly within the defined aspects of the disclosure. The grit material may include silicates in the form of garnets and the grit material may be a mixture of any combination of the grit materials disclosed. The layers may be constructed from different manufacturing methods which depart from the embodiments described herein but nonetheless remain within the ambit of the disclosure. For example, the grit material and sealing layer may be applied simultaneously to the adhesive layer rather than separate application of these products as described in the present disclosure. It will be appreciated that the general profile and sectional shape of the access ramp may vary depending on its application as well as the relative thickness of each layer where for example the base layer may be tapered. The present disclosure is not limited to access ramps but may also extend to surface matting.
All such variations and modifications are to be considered within the scope of the present disclosure the nature of which is to be determined from the foregoing description.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021901592 | May 2021 | AU | national |
