| 摘要 |
The protective device includes a switch, a spring loaded switch actuator overlying and coextensive with the upper surface of the attachment supported by the bed, an electric control interconnected with the power supply to the bed and said switch so that elevation of said bed is automatically terminated upon contact of said switch actuator with an obstacle above the bed. The protective device may also be integrated with the attachment support in that the support includes the switch and a spring supporting the attachment in an upper position so that the attachment upon engaging an obstacle will be depressed and actuate the switch to interrupt elevation of the bed.
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