| 摘要 |
Liquid storage tank level sensing gauge floats may be retrieved from within the tank without entry of personnel into the tank by a device comprising spaced apart pairs of pivotally-supported hook members which are engagable with guide arms or other support members of the float, upon lowering the device into the storage tank, whereby the float is grappled by the retrieval device for retrieval to the roof or top of the tank from outside the tank. The opposed pairs of hook members may be retained on a support rod by retaining collars which have slots for engagement with float guide rods or cables to further control the path of movement of the device during retrieval operations.
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