VaultDoors wroteIn the round vault door schematic above it shows slotted circles on the surface of each bolt. Could those be large screws that connect the bolts to the circular plate (with diagonal slots) as mentioned in MaxVaultageâs post above?
Yes- the slotted screws are numbered 7 on the drawing- the one around centre right of the drawing has the corresponding pointer line erased from the sketch, but thereâs a few other 7âs pointing clearly to the slotted screws. These screws are more than likely retaining revolving pins or pins with revolving sleeves through the bolt- I would very much doubt that all the stationary (tightened) screws/bolts formed the bearings surfaces for the mating/moving parts by themselves.
Allowing the pins to roll or by fitting sleeves that are free to revolve is an age-old way around excessive friction as potentially here- instead of a rigid pin wanting to rub and âbiteâ into the surface of the diagonal slot as it moves, the action of a pin or sleeve thatâs free to revolve produces a silky smooth ârollingâ action, which will remain smooth even without lubrication. Iâve ârescuedâ many Tann bankers, Treasury and other safes by doing this- itâs a lengthy modification but lasts forever- Tannâs should have done it at the factory if theyâd had any sense!
The drawing is for the one type of concealed boltwork I was referring to- the other has the pivoting âLâ shaped cams sliding each of the bolts out, instead of the diagonal slots and pins used here. Iâm guessing it would take someone who actually worked on them to know which were used on which doors, as both types used the frame mounted controls and both types are completely concealed not giving any clues to which of the mechanisms is inside- :o:
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