.~.~> Restricted orifice for initially delaying escape of restraining fluid
DEFINITION
Classification: 175/296
(under subclass 293) Apparatus in which (1) the hammer or impact device is acted upon and propelled by a body of fluid to deliver a blow (2) a body of fluid acts directly upon the hammer or impact device, or on holding means therefor to restrain said device against movement, and means to relieve the device or holding means from the influence of the restraining fluid to deliver a blow or (3) a means for holding the hammer or impact device against movement is released by a body of fluid to deliver a blow.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99, and the search there noted for other fluid operated devices.
