| 摘要 |
.A positive lock (70) for an ambulance cot and method thereof which requi res lifting an upper frame (22) of the ambulance cot, in order to permit a s pring actuator (74) to clear an interference fit (98) of the positive lock, are provided. If the upper frame is not lifted, then the spring force used t o pull on the positive lock (70) is insufficient to overcome the interferenc e fit. Clearing the interference fit permits the cot to be height adjusted. Optionally, a light indicator (81) may be provided which illuminates if the cot has not been positively locked in a height adjusted position.
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