cazalea
[Seiko Moderator]
17149
Right - same thing in old video & cassette players with rollers held under pressure from a spring pulling it against another
helical tension spring in a movement?
Is this common? If so, where? Spotted in an Olympic chronograph at the Omega museum - a movement with a helical spring used in tension, upper center. ...
Only time I've ever seen a spring in a movement
Was a lange chrono, however later versions it was removed I believe 🤷‍♂️
It's still there on the website pictures
Just more strategically hidden ...
thanks for the detail and great pic
I'm always interested in oddities / singularities - when one person does something differently than (apparently) everyone else. I assume that others use regular leaf springs pressing against the outer surfaces that are connected in these two cases by a he...
Here is a similar use of the coil spring; in Richard Habring's split second chronograph reset mechanism
Picture from "The Naked Watchmaker" deconstruction of the 7750 with split seconds. BTW the original image you provided of the pocket watch is using the helical spring in the same sub-system of the watch - to pull two arms together when resetting one of th...
thanks, so I see it's not unique.
all told, this is making me think of the British Garrard turntables I used to dismantle as a kid - lots of springs like that!
Its there in the
1815 perpetual calendar Rattrapante and the 1815 Rattrapante It’s not hidden - the wheel rotates - so it’s just by coincidence it’s hidden
Rattrapante only…
I’ve seen this in other split second pocket watches, always on the tongs, but never in other movements. There was a brief attempt at helical mainsprings in the 19 th c, but it died fast. A
There are still (expensive) watches with helical hairsprings; some watches have helical springs on their chrono pushers
MB&F, JLC, and a few others are still making watches with helical hairsprings AN ARTICLE ABOUT FIVE WATCHES Sold individually Available in 10 different diameters Fits 2.0mm, 2.5mm, 2.7mm, 3.5mm and 3.8mm case hole openings Many different shapes and styles...
Helical hairsprings have a solid basis - used in seafaring chronographs quite often as a means of normalizing the center of gravity of the hairspring.
The use of a tension coil was new to me
