Torque limiting clamp actuator

A clamping assembly for securing a cargo box on to a pair of crossbars on top of a vehicle, comprising:

• four clamps fastened to a floor of a cargo box, each clamp having a jaw assembly and being adjustable by one single actuator device for moving each respective jaw assembly serially between clamped and unclamped positions, the single actuator device including:
• a rotatable handle member,
• a driver shaft connected to the handle member for engaging the jaw assembly,
• a first set of teeth rotationally fixed relative to the handle member, and a second set of teeth rotationally fixed relative to the driver shaft, the first set of teeth engaging the second set of teeth until a threshold level of torque is applied by the handle member to the driver shaft, after which the first set of teeth slide over the second set of teeth, wherein each of the teeth in the first set of teeth is mounted on a cantilever member, and
• a spring plate mounted in contact with the cantilever members, configured to apply a force on the cantilever members.

A tool for driving rotation of a threaded member, comprising:

• a handle, and
• a keyed shaft coupled to the handle via a releasable torque transfer mechanism, the torque transfer mechanism including:
• multiple cantilever members, and
• a spring plate mounted in contact with the cantilever members, configured to apply a force on the cantilever members.