A New Elevating Mechanism
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for Tower Wagons
A Wood Hydraulic Gear with Many Attractive Features, among which are its Range, Controllability, Rigidity and Compactness when Out of Use
ARECENT addition to the wellknown hoisting apparatus and tipping gear produced by the Wood Hydraulic Hoist Co.. Ltd., 1 and 3, Brixton Road, London, S.W.9, is an hydraulic lift for tower wagons, as used for the repair and maintenance of street lamps, overhead conductors of tram and trolleybus systems, and so forth.
The new elevating tower is manufactured in three sizes, these being capable of lifting to heights of 17 ft., 24 ft., and 30 ft., respectively, above ground level. These models incorporate hydraulic rams formed in two, three and four sections. The platform height of each, when in the lowest position, is 11 ft. 6 ins.
Provision is made for the control of the hoist either from the platform or from the driver's cab, whilst the revolving motion of the platform is controlled from above. In respect of its elevation above the ground, the platform can be held at any desired altitude, whilst, with regard to its rotational movement, there are four positions in which it can be locked. Precautions have been taken to insulate the platform from the metal superstructure.
By reason of the fact that the platform can be turned when it has been raised, it is possible for repairs to be effected to overhead gear with the minimum of manwuvring and obstruction to traffic.. With the vehicle at the side of the road, and the platform swung over towards the centre, the operator can gain access to the equipment. Provided with collapsible rails, which fold down when not in use, the platform... does not add greatly to the overall height of the vehicle upon which it is installed. Thus a capacious van body can he mounted on the chassis, and a comprehensive assortment of spares and tools can be carried, in addition to a bench, etc., for repairs. Furthermore, if the vehicle be not required for the specific service foe which it is designed it can be employed for general purposes.
The ram is, of course, operated by oil, the pressure being supplied by a standard Wood pump, driven from the gearbox power take-off. When the telescopic cylinders, have been extended to the limit of their travel the feed is automatically cut off. They are designed in such a manner that, in this position, the platform is supported with great rigidity. It is claimed that no leakage takes place at the glands.
Only a matter of seconds is required for the elevation of the platform, and the equipment can be mounted on any suitable make of chassis. We understand that a considerable number of those municipal authorities who have tested the new Wood elevating tower have expressed favourable opinions, particularly with regard to its sturdiness.