US PATENT SUBCLASS 92 / 255
.~ Plural separable parts

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

172  DF  PISTON {19}
255.~ Plural separable parts {3}
256  DF  .~.~> Fastening means for parts include resilient element
257  DF  .~.~> Side wall portion interposed between separable axially spaced rigid members {1}
259  DF  .~.~> Side wall portion and relatively movable piston part having abutting inclined surfaces

DEFINITION

Classification: 92/255

(under subclass 172) Apparatus in which the piston is formed of a plurality of members joined together by means which allow separation of the parts from each other without in any way destroying or permanently deforming any of the members or the means for joining the parts.

SEE OR SEARCH THIS CLASS, SUBCLASS:

187+, for a connecting rod pivotally connected to a piston.

216+, for an open ended hollow skirt type piston formed of plural separable parts. Note "Statement Relating To Placement Of Patents Involving Combination And Subcombination Subclasses" of the Class Definition and the paragraph following the title in the schedule of this class.

SEE OR SEARCH CLASS

173, Tool Driving or Impacting,

127, for a piston of a drive motor formed of plural separate parts in which said piston forms an impacting hammer head. 403, Joints and Connections,

230+, for a joint between a rod and a plate or head. Class 403 takes a joint between a plate or head and a rod even though the plate or head and rod are disclosed and nominally included as a piston and piston rod. Class 92 takes the above combination where some feature of the piston other than that which relates to the joint is included. For a further statement of the line between Class 92 and Class 403, see References To Other Classes of the class definition of this class (92). Class 92 takes a joint between metallic parts

where the sole disclosure is directed to a piston for an expansible chamber device.