The Latest Wood Hydraulic
Page 65
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THAT well-known concern the Hydraulic Hoist Co., Ltd., 1-3, Brixton Road, London, S.W.9, which has works at Southport, has recently introduced a new tipping gear for chassis with capacities ranging from 14 ton to 4 tons. It is known as the D6-model Wood Hydraulic Hoist, and is intended for 2-ton loads, although it is of such robust build that the maker advises us that it is guaranteed to lift 100 per cent. overload.
The new gear is designed on similar lines to the wellknown Wood Hydraulic Hoist, with its patent system of oil circulation through its pump, the cylinder being used as an oil tank and thus dispensing with the need for auxiliary tanks. The D6-model has only two working parts—a geared pump and a cylinder with its piston head and ram. It has
been placed on the market to meet the demand for an inexpensive and efficient gear, and sells complete for £37 10s., together with power take-off.
In the design all cams and rollers have been eliminated, and a cylinder with a large diameter is used. A sub-frame is used on most chassis for standardizing the fitting, and it is said that the gear can be installed in two hours. An extra sub-frame is also used on most chassis, and this is said to take 75 per cent, of the stress when the load is being tipped, thus preventing the main chassis frame from being unduly stressed.
The foundation of the gear is a 54-in, channel frame, tapered off at the tear, where a drop-forged hinge bracket is attached to the longitudinal channel of the body by Newell's high-tensile bolts and nuts. The ram cylinder base is anchored to an angle-iron cross-member, which is attached to the chassis frame members through hinged brackets, thus enabling it to swivel on its axis. The pump is mounted on this cross-member, thus making it easy of access. The pump is of the geared pattern, and is driven from the power take-off through three universal joints and a pump shaft. At the top of the protruding ram is a trunnion . or compensating head, which is fixed with a transverse pin. This form of head .allows the load to be tipped when the vehicle is working on irregular ground.
The pump is driven through a specially constructed power take-off from the gearbox and has a ball check valve, which is responsible for limiting the angle of tip, as well as for holding the body securely at any desired angle ; when the full tipping angle is reached the hoist automatically stops. This is accomplished when the piston reaches the end of its stroke and uncovers a part connected with a low-pressure pipe, which permits the oil to return to the pump. This oil circulates without buildingup an excess supply, so that the hoist ie not subjected to undue stresses.
The company informs us that it has experienced a good demand for this new model during the past few months, and that its output at the present time is 50 hoists per week.