Quote:
Originally Posted by Dave Suponski
..... As far as the bolts go they are all the same profile.Just an angle cut at the 12 1/2 degrees.No channels.
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From the 1936 Parker Skilled Hands catalog. The illustration shows the particular form for the side channel bolt plate/ bolt mating interface. The side channels in the bolt plate are gripped by the side ridges in the mating bolt and fit within the machined recess in the lock bolt. This bolt plate/bolt is the 1910 patent version and is the third iteration of the lock system. This is why a gun with either no bolt plate or the flat R & R bolt of the 1905 version cannot be simply changed to include the 1910 bolt plate without also changing the bolt.
While I have not seen the function of the side channels/side ridges interface discussed in the Parker literature, I assume that it provides lateral stability, but I am not a degreed mechanical engineer or certified machinist.
Although these photos are from pages of the Skilled Hands catalog, I believe the same photos are reproduced in TPS, I haven't checked.
Bruce Day, Parker novice hoping to advance to second class