Cuckoo Clock Square - Cuckoo Clock Hospital

Transcription

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By: Lloyd L. Lehn PhD CC
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In the fall of 2012 I put together a paper on assembling the hands
of a cuckoo clock with round holes in the minute hand. I posted it on
my web page for anyone to use. Someone suggested that I do a similar
paper on hands with a square hole in the minute hand.
I did so in Dec of 2012 when a clock with a square hole in the minute had came in for repair. I posted it on my web page and shared it with
everyone.
I just worked on another cuckoo with a square hole in the minute
hand. It is similar but yet different from the one I did earlier.
The main difference is in the function of the hand nut.
In the rst case, the hand nut simply held the assembly together. It
did not clamp it together. The shaft holding the hands on the clock and
the hand nut did not rotate. The hand nut simply had to be there. It did
not/could not tighten the minute hand barrel to the shaft.
In this recent clock the shaft holding the hands on the clock actually rotates and the hand nut is used to clamp the barrel for the minute
hand to that shaft. The hand nut must be tight to secure the minute
hand assembly to the shaft. If it is not tight the hands simply op about.
THE BOTTOM LINE
BASED ON THESE TWO CLOCKS
If the hand shaft does not rotate, the hand nut simply keeps the hands
from falling off. It does not function as a clamp.
If the hand shaft rotates, the hand nut must be tightened to make sure
the hands rotate with the hand shaft.
I have left my original story as is as PART 1.
I’ve added the info on the recent clock as PART 2.
Enjoy,
Lloyd
Copyright 2012 by Lloyd L Lehn
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Cuckoo Clock
Square Hole
Hand Installation
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Cuckoo Clock Square Hole Hand Installation
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PART 1
Purpose: describe how to install cuckoo clock hands with square holes
Objective: permit an individual who does not regularly work on cuckoo clocks to change or work on the hands of a cuckoo clock which uses
hands with a square hole in the minute hand.
Assumptions: The clock has a movement that has a square hole in the
minute hand. Most of the ones I see are what I would call antique, count
wheel clocks. This example is not necessarily the way all such clocks
are designed but hopefully it will give the reader some insight.
Approach: We will take apart an example and then put it back together.
This photo shows the parts associated with a square hole minute hand.
There are three major parts involved
A - a nut which hold the hand assemblies on the clock
B - parts of the minute hand assembly - the hand, a square hole washer
and a nut which holds that hand and the washer on the minute hand assembly
C - the hour hand which is held on the hour hand assembly by friction.
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Here is the front of that movement. The rst thing we have to
do is pull the pin at the end of the
yellow arrow. That will allow us to
disassemble the rest of it.
Next we take off the three geared
pieces which represent the motions works.
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Here is a photo of the front of the
movement the hands came from.
You will recognize the motions
works. The hour hand goes on
the outside barrel while the square
hole minute hand goes on the
threaded square surface. The nut
holding on the hands on goes on
the arbor which runs through all
of the above parts i.e.. on the right
end. It does not hold on the minute hand per se.
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Here are the three parts of the motion works. The oval spring shown
above, rubs against the back of the
top gear to provide a clutch.
The gear in the middle is attached
to the barrel. The right end has the
threaded square shaft to hold the
minute hand.
The pins seen here are used to
raise the unlocking lever to start
the strike/cuckoo cycle. The pins
don’t always look like this. Some
of them are simply straight. Some
vary in distance from the center hour and half hour. Expect something like this but not exactly this.
The bottom gear/barrel slides over
the part above it. The hour hand is
pressed on the barrel and is simply
held by friction. This piece and the
hour hand are the parts of the hour
hand assembly you will see below.
Page - 4
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It looks like this when we get the
motion works off. The oval shaped
black thing is the spring which provides a clutch to allow you to set
the clock. The shepherd’s hook is
the strike/cuckoo unlocking lever.
It is raised up by pins and when it
falls the clock begins the strike/
cuckoo cycle.
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Here is the hour hand assembly two parts - the gear and barrel and
the hour hand.
Here are the parts for the minute
hand assembly:
- the gear, barrel, and unlocking
pins.
- a washer with a square hole
which keeps the minute hand from
going on too far - especially when
the square hole is larger than it
should be.
-v minute hand
- the nut which hold the minute
hand on the barrel
Many of the clocks I’ve seen like
this do not have the washer with
the square hole. I usually add one.
Somewhere along the line I bought
and assortment of various washers
as seen here. I usually have to le
out the square hole to make it t
the square threads of the barrel.
Page - 5
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Here we see the start of the minute hand assembly. The square
hole washer is placed on the barrel.
Then we add the hand. When it’s
actually on the clock, one wants to
be sure the clock will strike when
the hand is on the 6 or 12 -- not on
the 3 or 9.
Next we add the last piece of the
minute hand assembly - the nut
which holds the hand and washer
on the barrel.
Here is the last assembly - the
locking nut assembly. It is simply
a nut screwed on to the main arbor
holding on the other assemblies.
Normally one screws the nut on until it is tight. But I have seen them
where that simply squeezes the
hand nut assembly so it won’t turn
at all. I’ve used various methods to
be sure that nut is not going to turn
even if its not all the way on e.g.
smash the treads ever so slightly
with a hammer so the nut turns
with great dif culty or put on a tiny
drop of super glue on the threads
or in the nut to tighten it. I’ve never tried Lock Tight but expect it
would work if used in moderation.
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We add in two parts of the motion
works and the main barrel of the
hand assembly.
Then we add in the hour hand barrel and gear which his part of the
motion works. They are part of the
hour hand assembly.
We also add in the washer and
pin which holds this stuff together. The wheel under the pin has to
be pushed in a bit to overcome the
clutch spring behind it. Then slip
in the pin.
Page - 7
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Well now, lets put the clock back
together. First thing is to take
apart those assemblies we just
worked on. The movement starts
out like this.
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We next add on the hour hand thus completing the hour hand assembly.
Now we begin the minute had assembly
by adding on the washer with the square
hole.
Next comes the minute hand.
Then we add the nut which holds on the
minute hand.
The minute hand assembly is now complete.
Then we add the locking nut assembly
which holds the rest it on the clock.
We are nished.
Here one can see all of the components
of the three assemblies: hour hand, minute hand and locking nut.
Page - 8
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Now ASSUME the movement has been
installed in the case.
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PART 2
Here is the front of the 2nd clock. All
looks pretty much routine.
Here is the clutch from the rst clock.
It is not on the hands shaft but separate
from it.
The hand shaft does not rotate.
One can just see the clutch spring of the
2nd clock by looking through the back of
the plates.
The hand shaft rotates on this clock.
Page - 9
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Here I’ve taken off the rack, snail, motion
works, and the minute hand shaft.
Here is the hand shaft.
It rotates.
The very small shoulder just above the
plate is very important. When you tighten
the hand nut, it will push the back end of
the minute hand shaft against this shoulder. The minute hand shaft assembly will
thus be clamped to the rotating shaft and
the hands will rotate properly.
If it is not tight, the hands will simply op
around.
Page - 10
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This is the hour hand assembly made
up of the snail and the hour hand.
This slides over the minute hand shaft.
These are the parts of them minute
hand assembly.
Here they are assembled.
Page - 11
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These are parts of the hand assemblies.
The minute hand shaft, the square
washer behind the minute hand, the
minute hand, the nut which locks the
minute hand on the shaft and the hand
nut which clamps the assemblies to the
rotating hand shaft.
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Here is the main hand shaft and the
hand nut.
The hour and and minute hand assembly would be assembled on the movement without the hands.
Then the movement would be put into
the clock.
The hour hand would be shoved onto
the barrel of the snail.
The minute hand washer, the minute
hand and the minute hand lock nut
would then be put on.
Finally the hand nut would be tightened
to hold the minute hand shaft between
the hand nut and the small shoulder just
about the plate.
Page - 12
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Here are the three main assemblies:
Hour hand assembly
Minute hand assembly
Hand nut assembly - one piece.
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Cuckoo Clock Square - Cuckoo Clock Hospital

Transcription

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