Link Gear for Smaller Tippers
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A CTLIATED by a single double-acting horizontally
located ram, the medium-type link gear recently introduced by Telehoist,. Ltd., Cheltenham, is designed for four-wheeled vehicles With a maximum gross weight of. 14 tons. The link mechanism is generally similar to that of the heavy-duty type, eXhibited for the first time at the 1954 Earls Court Shim, in that the ram is relieved of all side loads by transmitting the thrust to the body underframe through a system of arms and levers. These are spaced about 18 in. apart to spread the thrust and provide body stability when tip ping at a steep lateral angle.
The ram has a diameter of 6! in. and the tube bore is hone finished. The gear pump, driven from the power take-off, has a capacity of 10 g.p.m. at 1,000 r.p.m., and the gear is capable of lifting loads up to 12 tons. During a test, a load of 11 tons 8 cwt. was lifted to an angle of 50" in a tipping time of 20 sec.
Two models are produced,. one with a tip angle. of 500. and a second gear capabld.Of tipping to an angle Of 70°. The latter is particularly suitable for dui-ripe-1-S' with scow-ended bodies.
The double-acting ram is Controlled
by a rotary valve in the driver's cab, which provides positive regulation of lifting and return, operations. Tipping may be halted in any body position, , The first two production models are fitted to A.E.C. Mercury chassis operated by • Stuart Macey, Ltd., High Wycombe. Additional vehicles of a simila:r type, equipped with the gear, will be progressively added to the fleet.