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Thread: Silk suspension

  1. #1
    Registered user. rgmt79's Avatar
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    Default Silk suspension

    I understand that a pendulum with silk suspension was typical in Austrian clocks around 1800. Can anyone show me a picture of a silk suspension?

  2. #2

    Default Re: Silk suspension (By: rgmt79)

    Quote Originally Posted by rgmt79 View Post
    I understand that a pendulum with silk suspension was typical in Austrian clocks around 1800. Can anyone show me a picture of a silk suspension?
    If you google 'Images for silk suspension pendulum', you will find photos, and in particular a very clear drawing which is actually from this board (but it's easy to find with Google). This drawing shows you exactly what you need to know.

    JTD

  3. #3
    Registered User Burkhard Rasch's Avatar
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    Default Re: Silk suspension (By: JTD)

    That´s the french version.HTH Burkhard
    Sorry I cannot copy the pic here.
    B.

  4. #4
    Registered user. rgmt79's Avatar
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    Default Re: Silk suspension (By: JTD)

    Thanks JTD, I found the drawing and it explains everything:-) Now I know how to repair the suspension, where the silk thread is missing, as per pics below...I was wondering how the "fast/slow" mechanism worked and now realise that the silk thread would have been wrapped round the arbour.

    Richard
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  5. #5
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    Default Re: Silk suspension (By: Burkhard Rasch)

    [MARQUEE][/MARQUEE]How interesting!
    Surprised to see two adjustment knobs in the photos.
    Last edited by harold bain; 06-16-2017 at 07:41 PM.
    Confucius say: "Man own clock know time. Own two, never sure."

  6. #6

    Default Re: Original Silk suspension from 1800s ?! (By: Robert Gift)

    I can only see one movable post (no knobs). The square one is fixed.

    JTD

  7. #7

    Default Re: Silk suspension (By: rgmt79)

    Here's the French version. Pendulum isn't attached in the photo but you can see the loop through which it hangs via a small hook. Also has cycloidal cheeks to help regulate the swing of the pendulum.

    Cheers




  8. #8

    Default Re: Silk suspension (By: DeanT)


  9. #9
    Registered User ClipClock's Avatar
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    Default Re: Silk suspension (By: DeanT)

    Heres a picture of an Austrian Grande Sonnerie that I repaired a while ago. Hopefully you can see how the silk suspension is threaded. Its worth noting that it had the tension washer on the inside of the front plate to provide enough tension so as to not un-ravel

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  10. #10
    Registered user. rgmt79's Avatar
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    Default Re: Original Silk suspension from 1800s ?!

    Yes, JTD is correct Robert. The pics below show the arbour which is controlled from the small end of a double key through the small hole just above the 12 o'clock position on the dial. The silk is knotted and fed through a hole at the other end of this arbour then wrapped around the arbour a few times and then fed through one of the 2 holes on the fixed post and then after creating a loop for the hook at the end of the pendulum rod is then fed back up through the 2nd hole in the fixed post and secured with another knot. This allows for the pendulum to be raised or lowered by simply turning the arbour with the key, one way for "fast" and the other way for "slow".

    Richard
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  11. #11
    Registered user. rgmt79's Avatar
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    Default Re: Silk suspension (By: ClipClock)

    Hi ClipClock, thanks for your input. Do you have any more photo's of your Austrian Grand Sonnerie? I'm about to start work on a similar movement, see attached photo's and would appreciate any advice/comments you can give about potential problems that I may encounter. Also, do you have the name of a maker and date for your movement?

    Richard
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  12. #12
    Registered User ClipClock's Avatar
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    Default Re: Silk suspension (By: rgmt79)

    Hi Richard, there was no maker on my clock, but the movement looked very similar indeed to yours.

    I've got to say I loved working on it, just such a beautiful little thing! I got caught out by not realising it had stopworks (which I gather is relatively unusual as they are very often removed). Check out if yours has them. They look like this (pic pre-cleaning!)



    If it does then you need to rotate them out of the way so you can completely let the springs down. Otherwise you will have my 'situation' where I thought it was let down, lifted the plate and all the little wheels got catapulted everywhere Luckily I retrieved them all and no damage, but also NO photos!

    I didnt find the internal timing difficult but the front plate is a little awkward to get things striking exactly when you want them. It would be worth making little discreet timing marks if it doesnt already have them. (I didnt and it took quite some fiddling to get it right)

    But overall it was an enjoyable experience! Mine was a portico clock. Heres the front plate of the movement



    Good luck with yours, it looks like a lovely clock! (Sorry for the giant pics)
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  13. #13
    Registered user. rgmt79's Avatar
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    Default Re: Silk suspension (By: ClipClock)

    Thanks Clip Clock, especially for the warning about the stopworks, I have something similar on a Seth Thomas movement. I didn't know that clockmakers from the early 1800's had invented this device.

    1) I don't have the movement to hand while I write this, but the photo below indicates that I might have them too.

    2) There are a lot of similarities between our movements, but not from the same clockmaker I think. Your movement is more flamboyant in style with curved shapes to the levers and their springs.

    3) Also, I'm not sure if you have a calendar mechanism? The photos below show my back plate with calendar wheel and with the calendar wheel removed.

    4) How have you cleaned and protected your movement to keep it so nice and bright?

    Richard
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  14. #14
    Registered User ClipClock's Avatar
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    Default Re: Silk suspension (By: rgmt79)

    Hi Richard, yes it looks like yours has Stops too! You'll find you have to let down the springs to the point where it stops and then put a click or two back on, then rotate the stops to allow you to continue to let down. The stops are just slightly sprung from the under side so you can prod them easily to move them. Hard to explain, but once you watch them being rotated you'll see what I mean!

    No mine didnt have the calendar function, gosh you have even more to set up!

    The movements do look a little different I agree

    Because mine was an visible movement I ended up lacquering it. It was a royal pain in the backside, but it did look very pretty when I finally finished! I used very thinned down lacquer and spent ages cleaning out the pivot holes etc.

    Good luck with yours, I'll be interested to follow your restoration, it's a lovely clock!

  15. #15
    Registered user. rgmt79's Avatar
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    Default Re: Silk suspension (By: ClipClock)

    Thanks:-) Actually, the clock is not mine unfortunately, it belongs to a friend and I have offered to help him restore it. I will post updates on a new thread. Do you have a picture of your finished clock, I would like to see it?

    Richard

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