
LAYSHAFT GEARBOXES 247
being drilled with a series of holes such that it can slide
either way over the blocking pins, as directed by the
gear selector fork. A system of detent spring loading is
incorporated between the assembly comprising the
blocking pins and cones and the sliding dog clutch.
As so far described, such a device would simply
provide a constant-load synchromesh action. Therefore
in order to introduce an inertia lock effect to avoid
premature engagement and clashing of the dog teeth,
the blocking pins have a central waisted portion with
delay-action chamfers at each end. The corresponding
blocking pin clearance holes in the hu ...