FODEN. Stand 79

12th November 1929, Page 186

12th November 1929

Page 186

Page 187

Page 186, 12th November 1929 — FODEN. Stand 79

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" Speed-Six" Platform Lorry, Rigid Six-wheeled Lorry. 6-ton 45 b.h.p. Lorry. 6-ton Undertype Lorry.

11101 ROBABLY the most interesting of the roden exhibits is a new model nominated the "Speed-Six." This particular vehicle has been designed to run on pneumatic tyres, consequently greater power and speed are necessary. These characteristics have been provided by embodying a comparatively high-speed two-cylindered engine developing 90 b.h.p. Steam is provided by -a patent horizontal' wateriube boiler of a new and efficient type.

Next in interest is, undoubtedly, a rigid-frame six-wheeler

shown as a platform lorry. This particular model is designed to carry a load of 10-12 tons at 12 m.p.h., and to ascend gradients of one in seven on good roads at proportionately reduced speeds. The engine is of the compound type with cylinders (which are steam-jacketed) having bores of 4.1,ins. and 7 ins, for the H.P. and L.P. cylinders respectively ; the stroke is 7 ins, in each case.

The drive is transmitted from the crankshaft to a fixed stud-shaft and thence by a strong roller chain to a compensating gear on the forward bogie axle, whence a further short chain runs to the rear bogie axle. Two independent brakes are provided operating hydraulically on all four rear wheels ; a powerful hand brake applies shoes in drums attached to the forward bogie axle.

One of the now famous 6-ton standard platform lorries is shown on the 14-ft. 9-in, wheelbase chassis, which is equipped with solid rubber tyres of 180 Pam. by 771 mm. section (front) and 180 .mm. by 850 mm. section twins

(rear). TM engine-is similar to the one already described, and incorporates a device whereby live steam can be delivered to the L.P. cylinder as well as to the H.P. cylinder. The boiler, which, by the way, is of the horizontal 'multitubular loco type, is manufactured throughout of Siemens mild steel and is hydraulically tested at 380 lb. per sq. in, for a normal working pressure of 230 lb. per sq. in. The firebox is especially large to give easy steaming with coal or coke fuel; the total heating surface in the firebox and the tubes is no less than 00 sq. ft. So far as the under type vehicle is concerned, a capacity of 6 tons is provided for with the possibility of using a trailer, when 10 tons can be hauled. In this model the working pressure for the boiler is 250 lb. per sq. in., and a superheater is included in the smokebox.

The power unit is placed horizontally across the frame in order to make the drive from the crankshaft as simple as possible.

The propeller shaft is driven from the crankshaft by caststeel double-helical gears, which are totally enclosed.

GARRETT. Stand 125

12-ton Six-wheeled Undertype Steam Wagons. Short Chassis for Tipping Body. Undertype Chassis. Suffolk. Punch Six-wheeled t;team -Tractor.

ARRETT rigid six-wheeled undertype steam wagons N.Tare by now very well known in all fields of activity, 'and many interesting examples of these vehicles, suitable for varying purposes, are to be seen. Briefly described, the

main features include a water-tube boiler feeding a poppetvalve engine carried—as the word undertype implies—amidships, below the chassis frame. One of-the claims of the manufacturer of Garrett vehicles is that the forward steering position for the driver gives a greatly improved view of the road. Another point worthy of note is that an accelerator control is provided, which makes' manceuvring in confined spaces a comparatively simple matter. A two-speed gear enables colonial condi-, Vona to be, dealt with, whilst three sets of independent brakes—the hand brake acting on the forward driving wheels, the foot brake taking effect on the rearmost driving wheels, with an additional steam brake on all four rear driving wheels—enables hilly country to be negotiated with absolute safety. A large water tank of 265-gallons capacity is a standard fitment. One. of the exhibits includesa flat platform body 19 ft. 1 in, long and 6 ft. 10 ins, wide, with 3-ft. 3-in. sides, these latter being divided vertically in the centre and binged at the bottom. The third exhibit is a shortened chassis with a smaller water tank of 245-gallonscapacity at the rear of the driver's cab, to allow for the fitting of a hydraulically operated three-way tipping body. A four-wheeled undertype wagon is also shown fitted with a flat platform body with inside dimensions of 14 ft. S ins. and lift. 9 ins. A. very interesting vehicle is the new six-wheeled tractor, which has been designed for road-haulage work in this country ,and 'abroad, and is capable of dealing with loads up to 40 tons. There are many unique features of design, includins. Ackerman-type steering, a 'patent pivoted double rear axle arrangement, and double water tanks having a capacity for 500 gallons. A winding drum is also included in the specification.

SENTINEL Stand 120 12-ten Six-wheeled Platform Lorry and Tippers. 6-8-ton Tilt-van and Tipping Wagon.

A N important point to note in connection with the three .ttexhibits of the famous DG6-type rigid six-wheeler Sentinel steam wagon is that the steaming range has been increased by approximately 25 per cent, by enlarging the capacity of the rear water tank. Other modifications to this popular machine are the enclosing of the rear ends of the radius rods and the extremities of the axle of the bogie.

A neat feature is to be found on the six-wheeled tipping wagon, in order to overcome any tendency on the part of a driver to operate the boiler-feed pump when on the road, and the tipping control has been left in the " tip " position.

A lever is fixed immediately below the driver's seat; this in coupled to the pump control, and rises to a vertical position when the control is set for raising the body ; thus

the' nOrmal 'seating position cannotresumed until the tipping gear returns to the travelling position and the

control is moved to safety. This device prevents the serious damage to the frame which might be occasioned by a careless driver.

It will be remembered that the DG6 rigid six-wheeler has a poppet-valve two-cylindered engine of 6-in. bore 8-in. stroke, working at a steam pressure of 275 lb. per sq. in. It drives through a two-speed gear and a differential, which are carried in a casing integral with the crankcase. Final drive is by roller chain, and the single tubular axle carries the self-compensating bogie arms. A vertical water-tube boiler is used, and this is equipped 'with a superheater and a retnevable firebox. Eight brake shoes are operated by steam and eight by hand, whilst centre-point Ackerman steering, with ball thrusts for: the stub axles, gives easy control. A chain-driven constantvoltage dynamo is installed. The flat-platform body mounted on the 10-15-ton chassis has a wheelbase of 12 ft. 6i ins. It is built to the order of the Cement Marketing Co., Ltd. The three-way-tipping wagon has been built to the order of Tarmac, Ltd., and the wheelbase is 12 ft. 2i ins.;'thi permissible load is 12 tons. So far as the chassis details are concerned this vehicle is similar to the foregoins. example.

A side-tipping DG6 ST model has a body with 2-ft. 4-in. sides and its maximum load is 14 tons.

Two chassis of the DG4 type are shown. Both hays load capacities of .6-8 tons. The engine is similar to that of the six-wheelers, and final transmission is by chain to

' One machine carries a sliding the dead rear axle, on which are mounted internal-expandins. brakes with foot and hand operation.

-top tilt-van for a wellknown flour manufacturer, whilst the other is a three-way tipping wagon with a body 13 ft. 6 ins. long, 7 ft. 6 ins. wide and 2 ft. 4 ins. deep.

It is interesting to note that there is only one moving part in the tipping mechanism of the DG4T machine. This is the ram, which is operated by means of hydraulic Pressure -applied by a special tipping injector fitted beneath the water tank on the off side of the vehicle.

YORKSHIRE s Stand 56

Six-wheeled Three-way Tipper. Six-wheeled Chassis.

nNLY two vehicles are shown on this stand, one being a rigid six-wheeled chassis and the other a similar machine equipped with a three-way tippins.' body. The vehicles are capable of carrying loads of 10 tons upgradients as steep as 1 in 6, whilst, with a load of 14 tens, gradients of 1 in 8 can be climbed satisfactorily. Power is supplied by a 60-b.h.n. engine which, with compound vertical cylinders of 4k-in. and 74-in. bores for the H.P. and L.P. cylinders respectively, is designed to run most efficiently at about 12 :m.p.h.

The unit is fitted with piston valves which are actuated by a Joy radial valve gear. The crankshaft, machined from a solid steel stamping, by the way, has a large outside flywheel fitted atthe front end, which greatly assists in maintaining steady running. All the bearings both for big-ends and main journals are white-metal lined, the big-end bearings

s their n

having dippers for obtaining oil supply. Steam is supplied by a 'Yorkshire patent double-ended loco-type boiler working at a pressure of approximately 250 lb. per sq. in. Superheaters are disposed in the smokebox doors and are designed so that there is no difficulty in sweeping the tubes. The superheaters, by the way, are of ample surface and give a high degree of " superheat" which, of course, resultsin economical operation.

The propeller shafts are of 'high-grade alloy steel, the forward shaft being fitted with two fabric universal joints to obviate stresses due to frame distortion.