发明授权
US09194192B2 Apparatus and methods for limiting movement of gripping members 有权
用于限制夹持构件运动的装置和方法

Apparatus and methods for limiting movement of gripping members
摘要:
Apparatus and method for limiting movement of gripping members of an elevator are provided. The apparatus includes a locking arm coupled to one or more of the gripping members and configured to move in a first direction when the gripping members move toward engagement with a tubular and to move in a second direction when the gripping members move away from engagement with the tubular. The apparatus also includes a first engagement member configured to move between a disengaged position, in which the first engagement member and the locking arm are relatively moveable, and an engaged position, in which the first engagement member allows the locking arm to move in the first direction but restrains the locking bar from moving in the second direction by more than a selected distance.
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