Clamping device with single movable jaw

A clamping device for lifting and moving objects can include a fixed and rotatable jaw facing a movable and rotatable jaw， which is activated by an arm assembly coupled to a fixed body. The clamping device can include a hand-free mechanism for switching between a clamping action and a jaw opening action for inserting the object. The clamping device can include a guiding mechanism for guiding an object to the space between the jaws， effectively enlarging the jaw opening for ease of clamping on thicker objects.