Some Features of Chassis-frame Design.
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THERE is little of a striking nature to be found in the
actind frames of the chassis; With one or two exceptions they are closely akin to those of British and American design. One of the exceptions is the Mannesmann 'gulag, in which what we may term a "monocle " type of side Member is enaployed. This is _similar to the " spectacles" pattern used for some years on certain Karrier six-wheelers, oxCept that the idea has beenadopted for machines having
a single axle at the rear. The construction is exceedingly strong, but must he rather expensive. Most German heavy Vehicles are built to draw trailers, and for this reason, in particular, are of a very sturdy nature, whilst the towing hooks are usually massive and often well sprung. • The loading level is nearly always quite low, the side members being arched over the rear axle and often dropped in the vicinity of the driver's seat. In the N.A.G.-Presto ts steel reinforcing plate is carried under the bottom flanges of the chassis side members; it extends from just behind the front Axle to behind the rear axle.
Several unusual designs of frame -Which were conspicuous a year or two ago have disappeared. One bad members of hexed channel section with tubes inserted to carry the bolts, but although of great strength the arrangement must have been exceedingly costly, and this is probably the chief reason for the almost general use of the ordinary channelsection members.
We were rather surprised to find so little use being made of the tubular crosa-member •' the torsional strength of this type of member has proved particularly advantageous on many British-built chassis and it has a high strength-toweight ratio.
Some of thc sub-frames used under the bodies of tipping Wagons are most elaborate, being built in cross-stayed girder form, which, whilst, light, must involve considerable labour. One such construction is shown by Fritz Gaubsehaft in conjunction with a Meiller tipping gear.