gravity knife
From Warlike
Q1394659
A gravity knife is a knife with a blade contained in its handle, which opens its blade through the force of gravity. This mechanism of opening is fundamentally different from the switchblade, which extends its spring-propelled blade automatically upon the push of a button, switch, or fulcrum lever. The main purpose of gravity opening is to allow opening and closing to be done with one hand, in situations where the other is occupied. Hence, historically, parachutists have been issued them to cut off caught lines, such as lines tangled in trees, a major potential use of the gravity knife.
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