Apparatus for pile driver cushion recoil
AssigneeHollandsche Beton Groep N.V.
InventorJoost W. Jansz
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Abstract
In an apparatus for driving a pile or similar object by the stroke of a hammer, the impact of a hammer stroke is transmitted to the pile or similar object through resilient means comprising a precompressed gas in at least two closed chambers, which may intercommunicate, arranged in series.
Claims10
Apparatus for driving a pile or similar object by the blows of a hammer in which the impact of a hammer blow is transmitted to the pile through resilient means comprising a precompressed gas, said apparatus comprising at least two variable volume compressed gas chambers, each said chamber being closed to the atmosphere and containing a gas which is precompressed to a predetermined value, the chambers being arranged in series in a path by which the impact of a hammer blow is transmitted to the pile whereby the volumes of the respective chambers are decreased by such impact, the predetermined value to which the gas in the chambers is precompressed being such that under the impact of the hammer blow the aggregate of the minimum forces directly available from the respective chambers exceeds the ground resistance.
Dependencies are inferred from the claim text.