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232 
Heavy-duty Six-wheeler Conversion
Page 107
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A RIGID six-wheeler of the trailing11.. axle type, employing as its basis the Bedford 2-ton long-wheelbase chassis, has recently been produced by A. Ferraris, Ltd., 200-220, The Broadway, Cricklewood, London, N.W.2. It is covered by patent No. 357,290.
The frame is cut short just before the wheel-arch and extended by two channels 7f ins, deep and in. thick, the overlap being 5 ft. long. The measurement from behind the cab to the end of the frame is 15 ft. 4 ins.
A 14-leaf inverted semi-elliptic spring, the main leaf measuring 3 ft. 2 ins. by 3 ins. by 1. in., supports the load at each side. Each spring is mounted4at its centre upon a nickelsteel cross-shaft of 21 ins, diameter by means of a bronze-bushed bearing 7 ins. long, the shaft being anchored to the
frame by a robust cast-steel bracket.
To the Bedford driving-axle spring journals are fitted east-steel hangers. From the lower and rearward end of each., hanger depends a shackle with Silentbloc bush, and to this is fitted the forwatd end of each front spring.
The rear eye a each main-spring leaf is solid forged as it has to resist braking torque. At this end each spring Is linked to the solid nickel-chrome trailing axle through another cast-steel spring hanger. The hanger has a cylindrical bearing on the axle, 10 ins.
long and 3/ ins, in diameter. Itcarries at its upper end a boss accommodating a radius-rod pin, which affords the rear anchorage for a spherically jointed radius rod.
The trailing-axle wheels are carried on standard Bedford hubs and bearings and have Bedford brake drums and shoes. The radius rods for the driving axle are similar to those of the trailing axle, and the brackets for their forward anchorage are below the frame ; these take the driving and braking stresses.
Through a system of rods and links, calculated to avoid unequal application under articulating conditions, the pedal controls brakes on all six wheels, whilst the hand lever operates brakes on the four rear wheels._ The long spindles for the trailing-axle brake cams are of nickel steel. The brake gear has been studied with a view to preventing obstructions near to the tyres, in order that chain tracks may, if required, be fitted to the rear wheels. The four rear wheels are equipped with 34-in. by 7-in, heavy-duty tyres, the standard Bedford front tyres being retained.