US PATENT SUBCLASS 135 / 80
.~.~.~ Relatively movable spiked and conventional elements

Current as of: June, 1999
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135 /   HD   TENT, CANOPY, UMBRELLA, OR CANE

65  DF  CANES, STICKS, CRUTCHES, AND WALKING AIDS {7}
77  DF  .~ Tips {5}
78  DF  .~.~ Exchangeable (e.g., conventional to spiked) {2}
80.~.~.~ Relatively movable spiked and conventional elements {1}
81  DF  .~.~.~.~> Spiked element housed within conventional elements

DEFINITION

Classification: 135/80

(under subclass 78) Tips wherein the crutch has both a spiked tip and a conventional tip mounted thereon, one in a ground engaging position and the other in a nonground engaging position, and one tip will move relative to the other tip during the exchange of positions.