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eatures of PAS SENG ODY COMMIX ION.
Page 128
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A Brief Summary of the Constructional Details of the Modern Motor Coach and Motorbus.
ENEATH the painted panels of the bus and coach lies the hardwood framework on which the stability of the bodywork depends. The pillars, of the finest English ash, have many functions. The outer surface gives the turn-under curve to the metal panels, and to it are attached the various members of the framework, from the cant-rail at the roof to the rail which forms a fixing for the panel extended below the chassis.
The most important joint of the pillar is its attachment to the cross-bar, where, by means of a gusset-plate or corner bracket, the body is made rigid transversely. Not only are the pillars the chief means for support, but grooves are formed in them for the adjustment of the windows, whilst between the inner panels and glass is concealed the mechanism for raising and lowering the wi ndows.
The construction of the roof is equally interesting. After the roof is boarded in pine or panelled in plywood the bodymaker stretches over the whole surface (after it has been primed in paint) a vast sheet of strong twill. This closes effectively all the joints and makes them waterproof, especially as the covering is again painted on top. The securing tacks are hidden by a metal cornice or water guttering.
In some instances the roof is reinforced at its rear end to permit luggage to be carried at this point, the space being enclosed by vertical rails with wire-mesh fillers. In this case the body pillars are sometimes made stouter or their number is increased to give support for the additional load. The design also differs somewhat whore a sliding roof section is specified.
The curve of the roof depends on the pattern of its supporting hoop-sticks. These have to be carefully graduated, so that the camber from side to side may be merged imperceptibly into the more abrupt shape at the ends. In many instances the roof structure now assumes a different aspect in front, for it is built up to form the top of a forward-drive cabin and a destination indicator is often neatly incorporated in it. In many cases the roof contour has to be considered to obtain the best possible appearance. A flat roof may make the vehicle look too squat.