| 摘要 |
.A positive lock (70) for an ambulance cot and method thereof which requires lifting an upper frame (22) of the ambulance cot, in order to permit a spring 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 to pull on the positive lock (70) is insufficient to overcome the interference 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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