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Old 02-24-2012, 02:53 PM   #5
popgun pete
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Re: Trigger Mechanism Design Rules

Thanks Ric. Here is another example.

The "Ocean Rhino" is a relatively recent trigger mechanism developed by Kevin Bruington and in the attached diagram one can see the results of the "circle analysis". The sear tooth is very low down in front of the sear pivot pin giving a very short lever arm length going into the sear pivot pin. There is good gearing in both trigger and sear levers as can be seen by the relative lengths of the force "in" and force "out" arms on the levers. The sliding contact position between sear lever tail and trigger retention step lies within the "intermediate circle" (shown in green) providing a positive "cam lock" design. This is an example of a "jaw type" sear lever as the sear pivot pin is high up behind the yoke formed by the sear tooth and the backing projection located immediately behind it. This allows a very compact design with reduced trigger pull.

This mechanism also has a well engineered safety device to block trigger movement.
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Last edited by popgun pete; 02-25-2012 at 05:07 AM. Reason: more info, corrected Kevin's name
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