Patent ID: 6378252
Filing Date: 2002-04-30
Classification: B61C,B61D,B62D,B65D

Abstract:
A mobile generator unit comprising an acoustically insulated wall structure comprising:a periphcral wall including at least one vertical wall panel having an inner surface and an outer surface, said wall panel comprising a number of vertically extending, spaced-apart ribs defining concave surfaces on said wall panel inner surface and convex surfaces on said wall panel outer surface, and a number of vertical, elongated, rigid reinforcement strips fixedly attached to said wall panel in facing register with each said rib concave surface, each said rib thus being covered with a corresponding reinforcement strip; a number of spaced-apart, rigid, elongated retention studs vertically attached to said wall panel, each said retention stud being fixedly attached to a corresponding reinforcement strip, and each said stud comprising a cross-sectionally C-shaped main body defining a back wall fixedly attached to said wall panel inner surface, a pair of spaced-apart, parallel side walls integrally extending from said back wall and having a free front edge portion opposite said back wall, and a pair of wing flange members each integrally attached to a corresponding said free front edge portion and extending laterally and outwardly away from said main body perpendicularly to said side walls, said free front edge portion of each said stud side wall further comprising an inturned flange opposite said wing flange member; and a number of semi-rigid acoustic panels defining a front surface opposite said wall panel inner surface, a rear surface applied against said wall panel inner surface, and first and second opposite side edge portions, each said acoustic panel being located between two successive said retention studs, with said wing flange members extending over said acoustic panel front surface at said side edge portions thereof; wherein said stud back wall is provided with a pair of longitudinal ribs for guiding screws being driven through said back wall when fixing said retention stud to a corresponding said strip.