A Simple Jacking Device.
Page 68
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THE task of raising a vehicle from the ground bY jacking up each end of the axle with the ordinary type of jack may involve considerable time and, if the job has to be tackled singlehanded, it is often quite arduous. A simple jacking device which is claimed to facilitate the operation is known as the Spring-loaded Jack and has just been placed on the market by Harvey Frost and Co. (1924), Ltd., 148-150, Great Portland Street, London, W.1. The crutch of the jack is mounted on a spring which is contained in the body, and a ratchet device prevents the lowering of the crutch while it is in use. The jacks, which are sold in pairs, are placed under the axle of a vehicle, and by levering up one side or the centre of the axle the crutch automatically, rises with the vehicle,
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locking at the highest point of lift: It will thus be seen that considerable saving of time and labour results, and we are told that if sufficient leverage can be brought to bear the whole operation can be carried out in. less than one minute.
The jacks were designed originally for use in conjunction with the fulcrum attachment for the HF model Al towing ambulance, but they are, of course, entirely independent of these devices. The price for a pair of the
jacks is 25s. Owners of breakdown equipment add garage engineers who possess HF ambulances should obtain details of the fulcrum attachment, which is an adjustable crutch fitting in the grooved bed in the ambulance; its use turns he outfit into a powerful fulcrum jack. '