leicaphile
Silver
Det enda jag inte fattar är varför kronorna på ryssarna (åtminståne på de Vostoks jag haft) är så sjukt vobbliga. Finns det någon mening med det?
http://forums.watchuseek.com/f54/vostok-amphibia-analysis-design-methodology-491757.html
Like the designs detailed before, the Amphibia crown and stem assembly incoporates a clutch between the two pieces, hidden inside the crown: they are coupled only when the crown is pulled slightly away from the stem, otherwise they are decoupled and the crown wobbles somewhat in relation to the stem. During winding - and time setting - the crown needs to be manually pulled away slightly as it does not incorporate an internal spring, eliminating the pressures imparted on the keyless works, and the inherent "wobble" prevents the stem from getting bent. When the crown is screwed in, the clutch de-couples, which means the crown and case become one unit, and the movement and stem become another. In the unlikely event of serious shock, where the movement moves minutely within the case, this decoupling means that the stem would never bear any load, and the wide clearance between the stem and stem tube facilitates that. The conventional designs do not offer this built-in protection.