US PATENT SUBCLASS 135 / 78
.~.~ Exchangeable (e.g., conventional to spiked)

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.~.~ Exchangeable (e.g., conventional to spiked) {2}
79  DF  .~.~.~> Reversible
80  DF  .~.~.~> Relatively movable spiked and conventional elements {1}

DEFINITION

Classification: 135/78

(under subclass 77) Structure provided with two or more distinct ground or floor engaging tips and means to alternatively place the desired tip into ground or floor engaging position.

(1) Note. The patents in this and the indented subclasses are primarily drawn to means to convert a conventional crutch into one which will traverse ice without slipping.