| 摘要 |
A failsafe brake is provided for preventing the uncontrolled descent of a counterweight arbor or stage equipment load in a counterweight rigging systems. Specifically provided is a failsafe brake according to which a brake shoe is biased to contact a counterweight arbor guide rail and grip it between the brake shoe and a backer plate, except when tension is applied to a line to move the counterweight arbor.
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