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Chinese finger trap
A Chinese finger trap (also known as a Chinese finger puzzle, Chinese thumb cuff, Chinese handcuffs and similar variants) is a gag toy used to play a practical joke on unsuspecting children and adults. The finger trap is a simple puzzle that traps the victim's fingers (often the index fingers) in both ends of a small cylinder woven from bamboo.
== Design ==
The initial reaction of the victim is to pull the fingers outward, but this only tightens the trap. The way to escape the trap is to push the ends toward the middle, which enlarges the openings and frees the fingers.
The tightening is simply a normal behavior of a cylindrical, helically wound braid, usually the common biaxial braid. Pulling the entire braid lengthens and narrows it. The length is gained by reducing the angle between the warp and weft threads at their crossing points, but this reduces the radial distance between opposing sides and hence the overall circumference. The more one pulls, the more the circumference shrinks and the trap tightens. The same effect is used in specialized textile manufacturing, the Kellems grip (a cable puller for electrical work), Indonesian woven fruit presses, and by fly-fishers.
Chinese finger traps are not intended for use as restraint devices. Strong victims of the prank may break the bamboo strips when they pull outwards, attempting to free their fingers and stretching the trap beyond its limits. However, a variation on the Chinese finger trap has uses in orthopedic medicine — namely, providing even pressure to the patient's digit(s) and at the same time immobilizing the joints — and serves a similar purpose as a traction device.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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