.~ Expanded by confined fluid from central chamber, pump or plunger
DEFINITION
Classification: 166/187
(under subclass 179) Devices wherein the packer or plug is moved into expanded, blocking position by means of or with the help of fluid supplied from a central conduit or receptacle or forced into the packer or plug by a pump or plunger means, the fluid while expanding the packer or plug being confined within the device.
(1) Note. Operation of a latch by fluid pressure whereby the packer or plug may be expanded by other means is not included. Such devices are classified on other features.
SEE OR SEARCH THIS CLASS, SUBCLASS:
121, for devices in which fluid pressure on a cup shaped packer expands it and causes it to act on an anchor to cause expansion thereof, the fluid while expanding the packer or plug not being confined within the device.
122, for devices in which fluid from a central conduit causes expansion of a packer or plug which acts on an anchor to cause expansion thereof.
SEE OR SEARCH CLASS 277, Joint Packing, appropriate subclasses, particularly
70+, 103 and 126+ for packing of general application which is biased by fluid pressure.
