| 摘要 |
<p>1,159,080. Vehicle bumpers. GENERAL MOTORS CORP. 7 March, 1968 [22 March, 1967], No. 11113/68. Heading B7J. [Also in Divisions B5 and C3] A vehicle bumper comprises a steel reinforcing beam 26 for attachment of the bumper to a vehicle frame 28 by means of support springs 29 and surrounding the outer surface of the beam a layer of synthetic resin microcellular foam body 30 at least 1¢ inches thick and of a density of 25-60 pounds per cubic foot, i.e. 1/3-2/3 the density of the unfoamed resin, the body 30 having one or more surface layers 20, 22 of non-foamed elastomeric resin. The bumper is deformable without the layers 20, 22 rupturing and the foamed body 30 is returnable to its initial shape following an impact less than a predetermined maximum. One or more of the surface layer may be coloured. The bumper is moulded (see Division B5) in an electro-formed nickel mould and the microcellular foam is composed of foamed polyurethane (see Division C3).</p> |
