US PATENT SUBCLASS 188 / 72.4
.~.~.~ By fluid pressure piston

Current as of: June, 1999
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188 /   HD   BRAKES

*  DD  WHEEL {10}
71.1  DF  .~ Axially movable brake element or housing therefor {8}
72.1  DF  .~.~ With means for actuating brake element {5}
72.4.~.~.~ By fluid pressure piston {2}
72.5  DF  .~.~.~.~> Piston for each of plural elements
72.6  DF  .~.~.~.~> And/or mechanical linkage

DEFINITION

Classification: 188/72.4

(under subclass 72.1) Apparatus wherein said component-pressing means includes a movable disc or cylinder fitted closely within a hollow tube or cylinder and moved by a force applied via a liquid or gaseous medium.

(1) Note. In this and indented subclasses subatmospheric (i.e., "vacuum") pressure is also disclosed as a fluid-pressure medium.

(2) Note. In order to be placed in this subclass, there must be both significant component-pressing means and significant cylinder or tube structure recited in the claims. Nominal component-pressing means and cylinder or piston structure together with more significant seal structure or

duct boot structure is found in this class, subclass 370.

SEE OR SEARCH THIS CLASS, SUBCLASS:

151+, for disclosure of a brake operator actuated by fluid pressure.

SEE OR SEARCH CLASS 92, Expansible Chamber Devices,

98, for a rolling diaphragm of the expansible chamber type with the entire periphery secured to the rigid working member forming the collapsible wall; subclasses 165+ for a guide or seal on the cylinder end portion of a piston or member moved by a piston; subclass 169 for particular details of the cylinder structure; and subclasses 172+ for details of the brake piston, per se.

192, Clutches and Power-Stop Control,

85+, for a fluid pressure axially actuated, clutch motor.

277, Seal for a Joint or Juncture, for a generic sealing means or process,

434+, for a piston ring or piston ring expander or seat therefor.