Underwater gas discharge hammer with gas reservoir
AssigneeRaymond International Inc.
InventorHarold Lee Adair
Life of this patent
Estimating the term…
Abstract
An underwater gas discharge type hammer is provided with a gas reservoir into which expended ram driving gas exhausts to avoid aeration of incoming water which surrounds the gas discharge device of the hammer. The gas resevoir is also arranged as a diving bell to minimize pressure changes under the hammer ram and thereby to maximize ram stroke and improve sharpness of ram impact on the hammer anvil.
Claims13
A gas discharge type underwater hammer comprising, a hollow elongated guide tube open at its upper end, a massive ram guided for up and down movement inside said guide tube, an anvil mounted at the lower end of the guide tube in the path of movement of said ram to be struck by said ram on its downward strok, means forming a cavity within said guide tube under and open to said ram, a gas discharge device positioned within said cavity, said gas discharge device being operable in response to a triggering signal to emit a sudden discharge of pressurized gas to drive the ram upwardly in the guide tube, a gas reservoir located outside said guide tube, and means for placing the interior of said guide tube under the ram into open fluid communication with said gas reservoir during the upward stroke of said ram.
Dependencies are inferred from the claim text.