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Old 02-19-2019, 05:49 PM   #1
popgun pete
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Collapsible loading butt

There are no new ideas in spearfishing after 80 years of inventors fully ransacking the cupboard of ideas, however some were made when materials were not up to the task. There have been removable and telescopic cocking stocks before, particularly in firearms such as the AR15, but here I present one format that could be used with modern carbon fiber materials that should be strong enough. The details are only partially thought out here, but the main idea is to have the loading butt pad actually be the rear section of the handgrip. A clip would hold the handgrip sections together, being disengaged before pulling back the cocking stock and locking it with a pin system so that during band cocking the stock does not collapse.
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Old 02-23-2019, 06:43 AM   #2
mclane234
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Re: Collapsible loading butt

Is there a need for one though? What kind of speargun would you use it on?
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Old 02-23-2019, 07:49 AM   #3
popgun pete
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Re: Collapsible loading butt

Some rear handle guns can be hard to load and chest loading for some people hurts their sternum and what one is trying to achieve here is to move where the wishbones drop in slightly further out from the chest. Hip loading guns are all about that, but their long cocking stocks can get in the way for other tasks, hence over time such guns have been equipped with shorter cocking stocks. There have been guns with removable cocking stocks and fold up cocking stocks, this idea is just using the AR15 type of sliding butt stock. One problem with a conventional cocking stock is the center of grip pressure is pushed downwards by the presence of the cocking stock tube above your hand on the grip, but with this embodiment the center of grip pressure remains high on the grip.

Here is an Australian Turnbull speargun, the gun is a copy of a Champion Arbalete, but in their desire to add a cocking stock the designers have pushed downwards the center of grip pressure by adding the tubular cocking stock right where your hand should go!

Hmm, the things that you find when you look around, a pink AR15 stock!!
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Last edited by popgun pete; 02-24-2019 at 01:35 AM.
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Old 02-25-2019, 03:45 PM   #4
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Re: Collapsible loading butt

If you look at the "Diveways" spearguns made in Japan then you will see that they have tried to raise the line of the cocking stock above the front barrel tube by having them mounted off-axis, but the offset is not really enough to raise the center of grip pressure.
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Old 02-25-2019, 03:53 PM   #5
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Re: Collapsible loading butt

Another approach has been to lift the line of the cocking stock, but keep it out of the rear sighting line by using an ovoid or squashed tube for the cocking stock tube. One speargun made in China uses an extended moulded tube as part of the handle molding, in other words an integral cocking stock tube that is in a sense a flattened plastic tube. I don't particularly like these as the strength of the cocking stock may not be up to the job in the long term, but a lot depends on the quality and thickness of the plastic used in their production. The gun that I am thinking of has a long cocking stock, not a short stub.
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