| 摘要 |
A car tumbler comprises a set of quarter circle-formed rockers (1) for placing under the car to be rolled over on its side, a hub flange (5) on each rocker for engagement with a wheel hub in one side of the car, the car tumbler being manipulated by a single person from only that one side of the car and requiring only dismounting the wheels on that one side, and a wheel carriage (4) on one end of each rocker which is devised in such a way that when the rocker is passed under the car the wheel carriage will engage with the inward side of and surround part of the lowermost periphery of the wheel on the other side of the car. A safety device to prevent the car rolling backward during tumbling and return to its horizontal position without any risk comprises a rotatable ratchet wheel (20) to which sustain leg (21) is welded and a main support foot (22) is connected which is parallel to the rolling axis and which in the starting position of the tumbler is in engagement with the base, a pawl (23,23') having a pawl spring (24) and a manipulation bar (25) which extends to the end of the rocker (1) and is freely accessible, and an auxiliary support foot (22) which extends in the opposite direction thereto and which is also in engagement with the base in the starting position of the tumbler. The safety device provides a considerable rigidity and stability in the longitudinal direction of the tumbler during the mounting and dismounting thereof. |
