In 1780, while making these chronometers for Brockbank, Earnshaw modified the pivoted detent by mounting the locking piece on a spring, thus dispensing with the pivots.
12.
The selected angles of the recesses and the incline on the locking piece produce a velocity ratio of about 4 : 1 between the bolt carrier and the bolt head.
13.
The locking piece is lifted out of the hoop of the hoop wheel, which then turns once, which leads to the great wheel turning 1 / 8 and striking once.
14.
Normally the recoil spring pushes the locking piece rearward, which in turn pushes the barrel back and holds the locking rollers . ( In some of these pictures the spring is removed)
15.
As the rollers move inward, recoil energy is transferred to the locking piece and bolt carrier which begin to withdraw while the bolt head slowly moves rearward in relation to the bolt carrier.
16.
A portion of this force is transmitted through the rollers projecting from the bolt head, which are cammed inward against the inclined flanks of the locking recesses in the barrel extension and to the angled shoulders of the locking piece.
17.
When the recesses in the slide are positioned with the rollers, the locking piece will push them out into the recesses and move forward, locking the barrel to the slide again, the barrel and slide will move forward a small amount and stop . prepared for another cycle.
18.
During the " unlocking " sequence, the two cylindrical rollers contained in the bolt head are cammed inward against inclined flanks of the barrel extension and act upon the locking piece and bolt carrier, propelling it rearward at a velocity greater than that of the bolt, which remains closed until the fired bullet has left the barrel and pressures inside the bore have been reduced to a safe level before withdrawing together with the bolt carrier.
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