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continued from page 16
         the  crew  then  pulled  the  gear,  fish
         and all, into the skiff. Those involved
         thought this may have been one of the
         first  times  in  history  that  four  point
         toggle linkage  was  used  for  a locking
         and releasing function.
           In the  summer of 1990, John took
         one of the primitive four-point toggle
         linkage quick release – made of silicon-
         bronze that Bob Schmidt had built – to
         Prince William Sound and used it to re-
         lease the skiff. This, taking place dur-
         ing sets on a commercial salmon purse
         seine operation. It worked so well that
         it was used the entire summer and re-
         placed the old pelican hook whose de-
         sign has yet to be proven as an efficient
         release mechanism.
           “Just recently, I even received a call
         out of the blue from Armin Schmidt,
         Bob’s son,” adds McMillan. “Schmidt is   Most Sea Catch units contain an enlarged jaw such as these to accommodate a wire rope or
         actually the only person in the family   strap instead of a common shackle.
         left who still fishes those same salmon   market and several devices were de-  testing,  offshore  petroleum,  general
         set-net locations. He also told me that   signed and sold that were built of cast   marine and military applications.
         he still uses his dad’s  old quick re-  silicon  bronze.  Finding  these  inferior   He then received a patent in 1999 for
         leases  to  recover  nets  that have  been   in strength, he eventually found a spe-  what is now known as the Sea Catch
         submerged.  And Schmidt  mentioned   cial stainless steel plate material bet-  Toggle Release. The Sea Catch is the
         he might even try some of the current   ter suited to the locking and releasing   only known quick release device in the
         models for this coming fishing season.”  functions of the device.     world that uses the toggle linkage prin-
           For the next several years McMillan   The first commercial production Sea   ciple to both lock and release lines or
         worked unrelentingly designing a more   Catch units of the current design were   objects under load.
         efficient and stronger quick release us-  sold  in  October  1994 to the  sea  tech-  What makes the Sea Catch so revo-
         ing the same toggle linkage principle.   nology  industry.  This  is  still  a  strong   lutionary is actually an innovative, in-
         Commercial  fishing  was  the  targeted   market area for the device as is drop   sightful design that anticipates the re-
                                                                               ality of at least one situation, featuring
                                                                               such  issues  as heavy sea conditions,
                                                                               corrosive  marine environment,  quick
                                                                               release kick-back, inadvertent release,
                                                                               and the occasional shock and lock-up of
                                                                               unanticipated overload.
                                                                                 Using computer-generated parts (pre-
                                                                               cision-cut from aerospace-grade stain-
                                                                               less steel plate) Sea Catch is a tough and
                                                                               multi-purpose quick release  that com-
                                                                               bines unique features such as no springs,
                                                                               common shackle connection, multi-direc-
                                                                               tional release capabilities, low friction
                                                                               releasing and a hitch-pin safety lock.
                                                                                 Every day, all over the globe, engi-
                                                                               neers, technicians and  crew members
                                                                               find themselves faced with the daunting
                                                                               and often unpredictable task of releas-
                                                                               ing  a  heavy  object while  under load.
                                                                               There are those that insist on using
                                                                               pelican hooks and pin-shackles – devic-
                                                                               es not meant to be released under load
                                                                               – whose effort to release rises sharply
                                                                               with increased load. In situations such
                                                                               as those, workers typically have other
                                                                               things on their mind aside from wonder-
                                                                               ing about quick releases.
                                                                                 Many,  though,  have overcome the
                                                                               usual risks associated with this opera-
         Haaland Diving, Inc. prepares ROV for deployment near Santa Barbara with the help of Sea   tion. They are using the simplest and
         Catch TR3. Project includes pipeline survey and Level II jacket inspection for Venoco, Inc.  continued on page 20

         18     Wire Rope News & Sling Technology   February 2018
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