Reciprocating hammer with downward thrust assist
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United States of America
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Sep 10, 2019
Grant Date -
Nov 17, 2016
app pub date -
Jan 22, 2015
filing date -
Jan 22, 2015
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Abstract
A reciprocating hammer with a two-stage acceleration of a pile driving ram, including a first stage in which initial gravitational acceleration is assisted by a thruster and a second stage in which the initially accelerated ram is allowed to further accelerate under the force of gravity alone for the remainder of the pile driver stroke. The force assist in the initial acceleration stage acts as a force multiplier, such that the anvil delivers impact forces to the pile greater than the impact forces achievable by gravity alone for a given stroke length/ram weight combination.
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