US PATENT SUBCLASS 173 / 206
.~ Hammer head constitutes piston of drive motor

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
206.~ Hammer head constitutes piston of drive motor {4}
207  DF  .~.~> Having valve not directly associated with motive fluid for piston {1}
209  DF  .~.~> Driven by internal combustion engine
135  DF  .~.~> Motive fluid applied to striking face {2}
138  DF  .~.~> With means to conduct motive fluid to or from striking face

DEFINITION

Classification: 173/206

Hammer head constitutes piston of drive motor:

(under subclass 90) Apparatus in which the hammer head comprises or is rigidly connected to a disk or cylinder within a chamber, said disk or cylinder having a surface which is acted upon by a motive fluid in the chamber which causes the disk or cylinder to move and deliver a blow.

(1) Note. These devices differ from fluid springs in Class 173, subclasses 204 and 212 in that a fluid spring contains a closed fixed volume of fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

127, for a piston formed of plural or diverse materials and which forms the hammer head of an imparting device.

200+, for a hammer head, generally comprising a piston, which is driven by pulsating fluid.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type, appropriate subclass for an expansible chamber motor having a piston that may be recited as a hammer head. 92, Expansible Chamber Devices, appropriate subclass for piston of an expansible chamber device that may be recited as a hammer head.

123, Internal-Combustion Engines, appropriate subclass for an internal combustion engine having a piston that may be recited as a hammer head.