c-g-designs

VII)-ACTION DESIGN.

CONCEPTION OF SINGLE SHOT  MATCH ACTIONS

6-FIRING MECHANISM.

-Firing principles:

The firing system must be such as to allow an as fast as possible loccktime. In a well designed system, it is now possible to approach the 1,3-1,4 millisecond of locktime.

This is roughly cutting by 50% the locktime of the fastest standard commercial actions.

For this, although maintaining a sufficient impact energy able to ensure a constant ignition, the following possibilities are to be considered:

--Reduce the F.P Travel.

This will need more energy hence stronger soring.

--Reduce the mass of the moving parts.

This will also need more energy and a stronger spring.

---Reduce the F.P tip diameter.

This will require LESS energy. Effectively, calculating the necessary force to impact a .0625’ FP tip Ø  requires some one good third of less energy than to impact a .0800’ Ø  F.P tip. This value is based on primer cup metal punched surface and resulting sheet metal deformation.

---Recalculate the spring specifications.

A shrouded F.P, based on the Mauser principle as most of the actual commercial repeaters have for consequence a long, heavy firing pin. As a second consequence, the long spring is of relatively small rate and need a long pre-compression to reach its necessary maximal force with no or very little rate variation between cocked and decocked lengths. A coil spring only reaches its full force when compressed to at least 2/3 of its nominal free length. It is therefore always under full constraints while in the bolt, be it cocked or decocked.

An other approach, thanks to the shorter bolt length is

described here as:

THE C.G FIRING SYSTEM

This system was patented in 1990..

Its main features are

--1) A Power Pack composed of a stack of Spring Cup Washers, currently named in the industry "Belleville Washers" from their inventor, or more precisely ‘Spring Discs’’

---Why using a stack of Belleville washers as power pack?
This spring system is the most powerful under small strokes and of much lighter　mass as compared to conventional coil springs.

--When a conventional firing pin coil spring is over 100mm (4 inches) long, and need pre-compression to at least 2/3 of its initial free lengtht In order  to store sufficient energy to  action the firing pinn, the actual Belleville stack is only 26,3 .mm(1.035'') high (free length) and is only compressed when the action is cocked to be then 22,3mm(.878’). In decocked position, the pre-compression is practically non-existent, a major advantage over the coil spring, as the spring discs system does not loose power if left cocked for  long periods of storage (when the bolt is kept stored out of the action for instance). When bolt is in place and decoked, there is no load at all on the Bellevilles. As stated above, a coil spring is always under full force compression, even when de-cocked and can loose power with time, even if of superior metal quality.

    --The system develop more energy than a coil spring for a much lighter mass (170Newton force in comparison to some 100to 130 Newton for the coil spring).

---This allows:

A considerable possible reduction of firing pin travel: under 4mm on dry firing  (.157’’) as compared to a minimum of 6mm (.236’’) for the best conventional coil spring (.270’ for the popular Reminton 700 for instance).

---As the Belleville system weights only a small fraction of the coil spring system, total firing pin mass is reduced accordingly. The average moving mass of a C.G firing pin, including the Belleville stack is only about 45 grammes (1,60 ounces).

--Also, each individual spring washer being compressed only when cocked and at only 60% of its maximal capacity (170-190N working force for a maximum capacity of 298N.), in both power capacity and compression range, each Belleville having only an individual compression displacement of 0,12mm (.0048’’), spring inertia and rebound are neglectible.

---The reduction in mass and shorter travel, and also the superior spring energy allows a much reduced locktime, in the order of 1,3 to 1,4 milliseconds.

2°) An inertia Firing Pin Tip.
        ---Why using a Floating Firing Pin?. Lets take an example: Like an inert Snooker ball hit by a moving one, the inert one recovers instantly all the energy accumulated by the other. This striker system works in a quite comparable fashion.

An other example can be those of the hammer blow on a center punch: One can use a light hammer and a sharp and fast blow, or a forge hammer and a slow and heavy blow for the same result. .I choose the light hammer princiole.

Also, this tiny double-ended Firing Pin piece can then be easily made of  superior quality material and process than the full lenght ones. It also self-center and is free-floating and no friction in the bolt wjthout any lateral constraints.

In the unlikely event of a firing pin tip break, this part is fully interchangeable, and can be replaced (reverted for the recent double-tipped now on all C.G designs) within seconds without altering the parts settings (in other words the protrusion unmodified when swapping), and with practically no shooting interruption.

All production models of the INCH and Deltas to come have now this double-tipped Firing Pin, this allowing to have always the spare tip stored in the Bolt. In case of an exchange necessity, suffice to revert the firing pin back to front, and continue firing as if nothing had happened….

R.G.C