摘要 |
A cable cutting member is adapted to be driven forward in a cable holder to cut a cable therein. For driving the cutting member, an explosive charge is detonated by a spring pressed firing pin slidably mounted in the holder behind the charge. A firing pin retractor slidably mounted in the cable holder behind the firing pin is detachably connected with the pin for retracting it a predetermined distance to compress the firing pin spring, the connection being such that when the pin has been retracted a given distance, it will be released automatically. A considerable distance behind the retractor there is a cylinder having a front end and a closed rear end and containing a piston spaced from both ends and mechanically connected with the firing pin retractor. The cylinder has an opening for water between its front end and the piston so that an increase in water pressure in the cylinder will move the piston rearwardly therein to pull the retractor far enough to release the firing pin.
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