A USEFUL SIX-TONNER
Page 67
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at Moderate Cost
TN our issue dated May 28thwe gave details. of. the design
of a three-axled '10-ton chassis which Mr. A. E. ,Jackson, of Thames Street, Kingston-onThames, had produced, using parts of the Dennis 1919 subsidytype 4-ton goods chassis. Several of these vehicles are giving good service on the road.
Mr. Jackson has now devised a four-wheeled six-tonner (of sixcubic-yds. capacity), incorporating the Bromilow and Edwards three-way tipping gear. It is not a converted subsidy-type Dennis lorry, but a chassis entirely builtup from drawings, the Dennis engine, gearbox, back axle, etc., being utilized.
The channel-sectioned frame members are 6f ins, deep, tapering to a depth of 44 ins, under the radiator from a point just in front of the rear shackle of the front springs. These members have a 2f-in. web and are in. thick. They are reinforced from the dashboard to the rear end by two further channel members of 7* ins, depth and 21 ins. web. These also are of A-in. section and are riveted and bolted over the other members, so as to give ample strength to tare for the stress of hydraulic tipping, There are five channel-sectioned crossmembers, also of A in. thickness and 4', ins, minimum depth. The sub-frame, which is suspended between the first and second cross-members, is a standard Dennis unit as used on the 1922 four-tonner and the engine and gearbox are carried in it. The third crossmember supports the front end of the tcrque tube and takes the torque and driving stresses. In order to provide for end tipping the frame is terminated immediately behind the rear-spring shackles, the body extending some 1 ft. 6 ins, further aft.
The front spring's are 3 ft. long and 24 ins, wide, and are shackled at the rear end, two of the nine leaves being it, in, thick and the other seven 1 in. thick. In addition,. there are , two rebound leaves. • The rear springs, which are shackled at both ends, are 3 ft. 6.ins. long and 3 his. Wide. Of the 14 leaves the. three longest are 4 in. thick, two are -A in. thick and the remaining
• nine are of 4-in. thickness. Dennis spring anchorages are used.
The engine is the Dennis 1922 model as used on the four-tonner of that year. It has a bore of 115 trim, and a stroke of 140 mm. The only alteration which Mr. Jackman makes• is the fitting of high-lift Cams. The Claudel-Hobson power-jet carburetter is employed, also the Simms magneto and Smith 12-volt dynamo lighting set with five lamps.
The gearbox is a standard Dennis 1929 type as employed on the six-tonner, the ratios of the three indirect gears being 1.66, 2.73 and 5.18 to 1, whilst the 'reverse gear ratio is 5.18.. For the final reduction either the Dennis standard 7.75-to-1 back axle, or an 8.75-to-1 axle can be 'given.
Dennis tubular-spoke wheels are used with solid tyres, twin tyres being normally fitted to the rear wheels.
The body is constructed on an oak .sub-frame, built in accordance with the requirements of Bromilow and Edwards, Ltd., the boarding for the floor and sides being of oak 14in. thick and lined with 1S-gauge steel sheet. •
It should be made quite clear that, except where .a departure is made in the design (this being tnainly in respect' of the springs, frame members, etc.), only genuine Dennis. parts' are used. The price of £615 includes the tipping gear,
the cab and body, painting and lettering and the 12-volt lighting set, the figure being a very reasonable one.