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Showing results 1 to 25 of 26
Search took 0.00 seconds. Search: Posts Made By: popgun pete
Forum: All About Guns 10-14-2023, 09:29 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

A crossbow mechanism gun for fish shooting, but not an underwater weapon. Made a decade or so back.
https://forums.deeperblue.com/attachments/barnett-fish-bazooka-r-jpg.59037/
Saw one where an...
Forum: All About Guns 10-14-2023, 03:22 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Trigger mechanisms are discussed here, including the Chinese crossbow mechanism.
https://spearboard.com/showthread.php?t=141058
https://spearboard.com/attachment.php?attachmentid=214629&d=1422931271
Forum: All About Guns 10-14-2023, 03:08 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

The crossbow mechanism fires the bow string, which pushes the bolt or arrow and uses gravity to help set it by swinging the levers. The speargun had to fire a very heavy projectile and needed a long...
Forum: All About Guns 10-11-2023, 06:12 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

For example.
https://spearboard.com/attachment.php?attachmentid=249605&d=1697065950
Forum: All About Guns 10-11-2023, 05:07 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

And to spell it out for those who may be wondering what I am talking about.
https://forums.deeperblue.com/attachments/ermes-sub-gearing-annotated-jpg.59260/
Note the system could use something else...
Forum: All About Guns 10-10-2023, 11:49 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

The roller tooth improved the mechanism gearing.
Forum: All About Guns 10-10-2023, 05:02 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

A gun from US company Scubapro that departed from the square cut sear tooth norm is the Panther gun made from a skinned foam plastic reinforced with fiber glass and produced by injection molding....
Forum: All About Guns 10-06-2023, 06:52 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Interesting to note that Sigal Sub have incorporated a floor in their Nemesis gun's sear box. You can see it here along with a spear latched in the gun.
Forum: All About Guns 10-02-2023, 06:02 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

To my knowledge the only star wheel sear lever that had survived into recent times are the Balco Sub “Thunder” and “Arrow” spearguns, the former has a cocking stock, and the latter does not. This...
Forum: All About Guns 10-02-2023, 12:32 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Just as a guide to nomenclature I use this sketch that I created for the Double Roller triggers.
https://forums.deeperblue.com/attachments/ermes-sub-dr-schematic-action-jpg.59206/
Forum: All About Guns 10-02-2023, 12:15 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Reverse trigger mechanisms that are frame lock can be improved by placing a floor in the sear box just forward of the spear tail latching position, this could even be a couple of transverse pins that...
Forum: All About Guns 09-30-2023, 06:27 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

We can see the sear box tunnel goes back a long way with this 1940’s Hurricane speargun from France. This gun originally has a tubular frame shoulder stock, like a carbine or rifle.
Forum: All About Guns 09-30-2023, 05:49 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Folded metal sear boxes used in timber stock guns often have a short run of the shaft to the spear guide track built into the gun body, so the shaft tail can still be wiped off the descending sear...
Forum: All About Guns 09-30-2023, 05:37 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

While spear rolling in the sear box is not a problem if you use hard wire wishbones, the square cut spear tail manufacturers employed a number of anti-roll features on their shafts. The Voit/JBL guns...
Forum: All About Guns 09-30-2023, 05:17 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

The Sea Hornet and its Biller counterpart had been the only reverse trigger mechanisms in widespread use when many manufacturers decided to also use this arrangement, but to flatten it they nearly...
Forum: All About Guns 09-30-2023, 05:05 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

At some time the Europeans realised that the shaft tail stop lugs should no longer enter the sear box, but instead be relocated to in front of the shaft wishbone notches, that way the shaft would...
Forum: All About Guns 09-30-2023, 04:40 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

In Europe not to be outdone speargun makers decided to also use a two-piece cam lock trigger mechanism and a variation on it where the sear lever tooth was pushed aside for the gun to be latched. The...
Forum: All About Guns 09-30-2023, 04:21 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Australian Wally Gibbins with assistance from John Lawson crafted a reverse trigger mechanism that used the principles enabled in the Denny Wells trigger mechanism, but had a completely closed sear...
Forum: All About Guns 09-30-2023, 04:01 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

The next evolution was the two-piece cam lock trigger which had the advantage of using existing square cut tail spears, the most famous being the Undersee trigger mechanism invented by Denny Wells....
Forum: All About Guns 09-30-2023, 03:53 PM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

In Australia very early spearguns were variations on the hinge gun which uses a friction trigger, much like the tilting washer on a modern caulking gun. This means the gun has no spear tail notch and...
Forum: All About Guns 09-30-2023, 09:33 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

The advantage of the square cut sear tooth and matching spear tail notch is the load bearing area is much greater if the opposing faces press flatly against each other, but in practice they may not...
Forum: All About Guns 09-30-2023, 09:16 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

There were a few spearfishermen in the USA who decided to follow the pull down sear lever used by the Europeans, the most notable being the Sampson gun. Another was the 1955 gun invented by Thorburn...
Forum: All About Guns 09-30-2023, 08:20 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

I thought that I should write it down before I forget as I am not going to be here forever and many things today we just take for granted, but they have a historical basis for being the way that they...
Forum: All About Guns 09-30-2023, 08:10 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

When plastic grip handles replaced cast alloy gun handles the star sear lever also made it into those guns. The leverage advantage of a star wheel trigger is zero, no better than a single-piece...
Forum: All About Guns 09-30-2023, 08:05 AM
Replies: 28
Views: 5,706
Posted By popgun pete
Re: Why US speargun use square cut sear tooth and Europeans used angled teeth.

Note that while they look vaguely similar the Beuchat is a single-piece trigger while the Cavalero Champion gun is a two-piece pull down sear lever trigger. The Champion gun was more widely copied...
Showing results 1 to 25 of 26
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