(under subclass 86.4) Grapples having socket members, usually embracing the load, within which is a wedges, which grasp the load through cam action upon the socket casing.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86.3+, for cam operated contracting grappling means peculiarly adapted to function in a well bore.
96, for expanding grapples of this type.
SEE OR SEARCH CLASS
166, Wells,
55+, for devices which cut or perforate well pipe having similar structure.
175, Boring or Penetrating the Earth, 255, for an earth boring device of the core forming type
provided with a core grasping means of the sliding wedge type.
