Automatically acting, lockable hoisting block

A hoisting block, which is lockable and automatically acting in relation to a hoisting member, said block being freely movable along the member, which extends from a load to be moved and to the block, such that the block can assume a desired position in relation to the load, characterized in that the block includes at least one locking mechamism, said locking mechanism comprising two arms, which are pivotable in relation to the block and mutually independently, said hoisting member being arranged onto said arms, at least one plunger actuable by at least one locking mechanism, a seat disposed in the region of the plunger, a section of said hoisting member running through a groove commonly formed by the plunger and seat, said section of the hoisting member being locked between said plunger and said seat influenced by said locking mechanism.