Strap cage
From wipipedia.org
A strap cage is a tube like arrangement of leather straps on a circular base which used in conjunction with a hoist as a bondage device. The strap cage is place on the floor under the hoist and the captive steps on to the circular base. With the captive holding their hands at their sides the top pulls up the tube until the opening is above head height. The opening is the attached to the hoist and the strap cage lifted off the ground. Once the cage is off the ground the weight of the captive causes the straps pull in towards the center, pressing on the captive and preventing movement.
