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| Fluid pressure brake control systems for freight locomotives |
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| Modulator valve for a spinning and skidding wheel assembly |
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| Electric motor driven speed control |
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| Drive arrangement for a four wheel drive vehicle |
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| Brake system with brake slip control |
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Air-cushion apparatus
| Details |
Inventors: Clements, Harold J.;
Assignee: Modern Precision Engineers and Associates Limited (Ashford, GB2)
Primary Examiner: Mitchell; David M.
Assistant Examiner: McGiehan; Donn
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch
An air-cushion supported, manually manoeuverable, load-carrying apparatus including a load-carrying base, a dependent perimetric skirt for laterally confining pressurized air, and a member for restraining a foot portion of the skirt to a permanently inwardly extending configuration so as to be urged into sealing engagement with the ground by the internal air pressure during operation. The skirt restraining member is secured to the skirt at spaced inner and outer regions, spanning the foot portion. The rectilinear spacing is substantially less than the corresponding width of the foot portion so as to provide the foot portion with freedom to seal with the ground. |
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DETAILED DESCRIPTION OF THE INVENTION As shown in FIG.
1, an air-cushion apparatus according to the invention comprises a substantially rigid air-impermeable load-carrying base 1 having a load supporting surface 2.
In this embodiment, the base 1 comprises a plywood or blockboard panel of about 2 m.
times.
1 m dimensions reinforced by two rigid steel sections 3 secured to the underside thereof.
The vertical walls of the sections 3 have holes therethrough for air flow.
Rigid, right-angled steel sections 4 are secured to the underside of the base 1 and extend around the entire periphery thereof at a uniform distance from its edges.
A resilient wall 5 formed of low-density open-cell foam material and of rectangular cross-section is secured to the underside of the base 1, for example by means of adhesive, and again extends around the entire periphery of the base.
The wall 5 may be made of expanded rubber, polyester or other polymeric foam material and is not secured to the members 4, so as to allow vertical compression of the wall.
A flexible, air-impermeable skirt 6 is secured continuously around the edges of the base 1, and surrounds the entire periphery thereof.
The skirt 6 is permanently formed to have a substantially right-angled, L-shaped cross-section, comprising a substantially vertical wall portion 7 and a foot portion 8 which underlies the foam wall 5.
The foot portion 8 of the skirt is secured to skirt restraining means in the form of a flexible, air-permeable, substantially inextensible sheet member 9, comprising for example a sheet of net, an apertured sheet or a permeable fabric such as buckram.
The sheet member 9 prevents substantial outward movement of the skirt 7.
A control valve (not shown) is mounted on the base 1 and compressed air is supplied to the valve from a suitable source, preferably a pump mounted on the base, to feed compressed air therethrough to the air chamber defined by the base 1 and the skirt 6.
Referring now particularly to FIG.
2, the permeable sheet member 9 is secured to the foot portion 8 of the skirt, for example by stitching, at spaced inner and outer regions, that is outwardly at a seam 10 where the substantially horizontal foot 8 joins the vertical wall portion 7 of the skirt, and inwardly at a seam 11 at the inside edge of the skirt
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