Rotation-preventing lock assembly

A safety lock assembly for a longitudinally chambered rotatable part on a mechanical apparatus, said lock assembly comprising:

• a lock housing shaped and dimensioned for slidable insertion into a chamber of said rotatable part;
• an eccentric lock located at one end of said lock housing and coupled to the latter for insertion in unison with the lock housing into said chamber to a position at one end of said rotatable part, said eccentric lock being rotatably adjustable between a retracted position in which it is disposed completely within the peripheral outline of said lock housing and a locking position in which it projects transversely beyond the peripheral outline of said lock housing
• a. for engagement laterally against the apparatus to prevent rotation of said rotatable part, and
• b. for engagement longitudinally against said one end of said rotatable part to prevent withdrawal of the lock housing therefrom;
• and key-operated means in said lock housing accessible by a key inserted into the opposite end of the lock housing and operable by the key to turn the eccentric lock between said retracted and locking positions.