Accessory clamp for abductor bar

A clamp which can be releasably secured to an elongated object comprising:

• a frame defining a first clamping member;
• a movable member which defines a second clamping member secured to said frame for movement relative to said frame, said movable member including a contacting surface;
• said first and second clamping members being so configured that said clamping members can be moved to an engaging position in which said clamp cannot be removed laterally from the object when the object is located between said clamping members;
• and
• an operator, movement of said operator causing relative movement of said clamping members among an unclamped position, in which said clamp can be removed laterally from the object or in which said clamp can be moved laterally with respect to the object to locate the object generally between said clamping members, an intermediate clamping position, in which (i) said clamping members are in their engaging position and (ii) said clamp can be slid along the object to position said clamp at a desired location along the object, and a fully clamped position, in which (i) said clamping members are in their engaging position and (ii) said clamp is securely fixed to the object, when the object is located between said clamping members, to prevent said clamp from sliding along the object;
• said operator defining a cam surface having two separate actuating surfaces adapted to individually engage and become seated on said contacting surface to provide two stable clamping positions of said operator, movement of said operator to a position wherein neither said actuating surface is seated on said contacting surface permitting said clamping members to assume their said unclamped position, movement of said operator to a second position wherein a first said actuating surface becomes seated on said contacting surface causing said clamping members to assume their said intermediate clamping position, and movement of said operator to a third position wherein a second said actuating surface becomes seated on said contacting surface causing said clamping members to assume their said fully clamped position.