US PATENT SUBCLASS 166 / 239
.~ Operated by dropped weight
Current as of:
June, 1999
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166 /
HD
WELLS
237
DF
DETENTS OR CLUTCHES
{3}
239
.~ Operated by dropped weight
DEFINITION
Classification: 166/239
(under subclass 237) Devices in which the movement prevention means is set in operation by a falling weight (e.g., a go-devil).
SEE OR SEARCH THIS CLASS, SUBCLASS:
153+, for fluid driven pistons operating detent means.
193+, for dropped ball type plugs operating detent means.
238, for a weight operated movement preventing means comprising an element bridging a fluid conduit.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth, 268, 270 and 271 for earth cutting elements which are
laterally shiftable below ground (e.g., expansible) by a dropped element.
