US PATENT SUBCLASS 173 / 53
HAMMER OR TOOL SHAFT RECIPROCATED BY GRIPPING MEANS WHICH RELEASE OR YIELD TO PERMIT ADVANCE

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

53HAMMER OR TOOL SHAFT RECIPROCATED BY GRIPPING MEANS WHICH RELEASE OR YIELD TO PERMIT ADVANCE {2}
54  DF  .~> With fixed means cyclically contacted by grip structure {1}
56  DF  .~> Means concurrently moving shaft about an axis

DEFINITION

Classification: 173/53

(under the class definition) Apparatus in which a hammer head or tool includes a rod or rod like structure rigidly connected thereto, and the drive means includes means to grasp said rod or rod like structure, and a means to reciprocate the grasp means, said grasp means permitting the hammer head or tool to move forward relative to the reciprocatory path of the grasp means by (1) cyclic release by the rod or rod like means by the grasp means or (2) relative slippage between the grasp means and rod or rod like means as the work progresses.

SEE OR SEARCH CLASS

72, Metal Deforming,

429+, for a tool driving means in a metal shaping machine, especially subclasses 431+ for a yieldable connection and subclasses 435+ for a "drop-hammer".