Fogg´s patent?

[beta21]

Hi,
I´d figure some of You would know what Fogg´s patent is, marked on my Martyn Sqare AWCo. The patent shuld have meant something important, since the date of it is marked on the bottom plate (feb. 14th 1865). However I can´t notice any odd "patentable" features on the watch.
Anyone who could enlighten me??
Peter

[beta21]

Hi,
I´d figure some of You would know what Fogg´s patent is, marked on my Martyn Sqare AWCo. The patent shuld have meant something important, since the date of it is marked on the bottom plate (feb. 14th 1865). However I can´t notice any odd "patentable" features on the watch.
Anyone who could enlighten me??
Peter

[terry hall]

Using the "find" button at the top of the page header brings up these posts.

old ref::http://nawcc-mb.infopop.cc/eve/forums?a=srch&s=2386079361&result_detail=3&x_as=&findw=fogg%27s+patent&f=&sis=&dt=&author_name=&sort_order=2&action=simplesearch&search=Search[/url]



a quick search using Google [searh term fogg's patent]

brought up this page from Tom McIntyre's web site...foggs patent is there..

[url="http://www.awco.org/AWCo/Other/FittsPatent/FittsPatent.htm"]http://www.awco.org/AWCo/Other/FittsPatent/FittsPatent.htm

enjoy

[Tom McIntyre]

I am not sure I have Fogg's big patent on-line. It may be there along with Fitt's patent.

The short answer is that the center pinion screws into the center arbor. If the main spring breaks, it comes unscrewed.

Burt's patent on the Elgin watches is the same and the two companies decided to settle the patent dispute with cross licensing. Thereafter, the watches of both companies were marked patent pinion.

Tom McIntyre
2nd VP Elect
Tommy the JOAT's Web (http://www.AWCo.org)

[beta21]

Guess I could have looked a little closer in the watch... Here´s a pic of the patent. It is a left hand thread with three "splines" or tracks. (sorry for not knowing the correct english term.) This makes the inclination of the thread steeper, giving the pinion less tendence to bind.Fogg´s (http://se.photos.yahoo.com/bc/peter_stammler/vwp?.dir=/Mina+bilder&.src=ph&.dnm=Fogg%b4s+patent.jpg&.view=t&.done=http%3a//se.photos.yahoo.com/bc/peter_stammler/lst%3f%26.dir=/Mina%2bbilder%26.src=ph%26.view=t)

[terry hall]

NIce picture! Thanks for posting it...



The purpose of the thread is:

when a mainspring breaks, power is released, sometimes violently...
the threaded portion of the pinion allows the 'small gear' to absorb this force, by 'unthreading' from the pinion. This protects the train of the movment from damage.