Urgos Clock Pendulum Suspension
For some Urgos floor clock movements. The square grandmother clock sized movement may take the smaller sized one. The grandfather units taking the larger size. However this is not all they used, more often they used suspension A. It is called a suspension because it suspends the pendulum in the air. It is called a spring because it flexes back and forth. If a spare spring is ordered it would be a good idea. One can be put on the bottom of the weight section of the clock for next time. That way the search to find the next one will be saved.
Does not have to be exact
Suspension springs do not have to be exact in length. If the clock runs slow simply raise the pendulum bob with the screw at the bottom. If the clock is running fast then turn the nut as too lower the pendulum bob.
Most common springs
The suspension spring A is by far the most common style suspension springs. It is most likely the one needed by default. If the old suspension spring looks similar to this one it will be the right one. Small mantle clocks take suspension A1, wall clocks and small grandmother units will take A2. The A3 size is for grand father clock sized units with a larger bob diameter. It also can be used on a grandmother sized clock with a larger bob diameter. The larger A3 is used with large bob diameters so the bob will not wobble front to back. If using a pendulum with a bob of 8 1/2 inch diameter or larger please order suspension A3 for this reason.
Not as common
Urgos uses the single hook style as seen in the picture suspension B. However they also used suspension A style and this is much more common. Suspension C and Suspension D are used mainly on very old antique round movements. These are mainly French clocks and US made units made prior to 1945.
Suspension Spring Installation
There are two ways that the suspension spring may be held into the suspension post. One way is with a thumb, or set screw. Just remove the screw and the suspension spring will fall out of its slot. The other way uses a tapered pin. It is a pin that is skinny on one end and wide on the other. Push the skinny end through the pre-drilled hole in the suspension post. Push it through the hole in the suspension spring all the way to the other side of the post. Remove it with needle nose pliers. Twist and yank it out from the wide side. Please note that some set screws may be too wide for the suspension top hole. In that case, use a tapered pin to secure the suspension instead of the screw.
Connect the leader
Hook the leader on the suspension spring prior to install. The intent is to have the suspension spring hooked and the leader engaged with the crutch. At this point the suspension can be lifted into position as you insert the set screw. Note that the suspension is lifted with the leader hanging on it while the leader is engaged with the crutch. As one unit.
What is next
Hang the pendulum on the newly installed leader. Just hook it right on. Give the pendulum a good swing. Over swing the pendulum to set the correct beat. No mechanical clock with a pendulum will run correctly if not put “In Beat”. Not familiar with this term? See, “How to put My Clock In Beat” instructions.