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 Posted: Mon Feb 12th, 2018 01:14 am
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Keith Spence
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I’m new to the forum and to vintage fans so first thanks for all the information on the forum and on the Fan Collectors web site Restoration/Repair section. It has already been very helpful. I found an interesting looking small fan and bought it on impulse. Identifying it on the Fan Collectors gallery it’s a Robbins & Myers 9504 Radio Guard. Photo attached.




 Initially the fan was very tight with the grease in the gear box being almost solid. Cleaned and lightly oiled with 3 in 1 Blue and reassembled. (Will use the Royal Purple gear oil when restoration is complete) Power cord is significantly rodent chewed and switch isn’t conductive in any position. Connecting a power cord directly to windings and the fan ran nicely but with significant vibration. Followed the balancing section and it is very smooth now. The main issue seemed to be the blades not being in the same plane.  The original problem that probably put the fan out of commission looks like it was dropped and the oscillating shaft in the base bent jamming the gear mechanism. Photo attached.



 Looking at the gear box the worm shaft looks to be in perfect condition but the worm gear is stripped. Photo attached. 







The worm gear looks to be a softer material (sacrificial gear to protect the worm shaft that is part of the armature?) not metal. Guessing not plastic in the 1930’s so maybe phenolic? So finally the questions:
- Possibility of old stock gears still around?
- Recommendation for someone to make a new gear?
- I haven’t been able to identify the type of set screw holding the shaft in place its not allen, torx, phillips but kind of looks like a four point Bristol spline but it isn’t. Photo attached. If someone can identify the right drive
it would be appreciated. I think I can square up a phillips to work if no other option.










 
Thanks in advance for any help,
Keith

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 Posted: Sat Feb 17th, 2018 02:27 pm
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David Allen
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That's a unique little fan!  Different design on the cage with it being made of sheet metal!

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 Posted: Sat Feb 17th, 2018 03:04 pm
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Craig Robbins
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Antiquefanparts.com might have a gear. I don’t think that is the set screw in the last picture. Look deep into the threaded holes for the gear box cover, there might be a set screw in the bottom. I’ve never done one of these so it’s hard to tell from the pictures. Welcome to the forum, good luck and let us know how it turns out. 

Last edited on Sat Feb 17th, 2018 03:16 pm by Craig Robbins

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 Posted: Sun Feb 18th, 2018 04:09 am
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Keith Spence
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Thanks David, it is a cool little fan amazing it can run so smooth after many years of use and neglect. The sheet metal cage will need a little body work but should straight out nicely.
Craig thanks for the lead on finding gears I'll contact them and see what they have. Also thanks for the idea to look for a set screw in the bottom of the cover screw holes I would not have thought to look there. I'll let you know if that is where it is.

Keith

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 Posted: Sun Feb 18th, 2018 01:30 pm
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David Allen
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Keith Spence wrote: Thanks David, it is a cool little fan amazing it can run so smooth after many years of use and neglect. The sheet metal cage will need a little body work but should straight out nicely.

Craig thanks for the lead on finding gears I'll contact them and see what they have. Also thanks for the idea to look for a set screw in the bottom of the cover screw holes I would not have thought to look there. I'll let you know if that is where it is.



Keith


I hope you can find that gear!

Also, forgot to ask but why the name Radio Guard? I wonder if it had some early form of electromagnetic interference suppression in the motor?  Is it an induction motor, or is it a brushed motor?


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 Posted: Sun Feb 18th, 2018 03:52 pm
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Keith Spence
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Purely a guess on my part but it seems like they designed it to look similar to the Atwater Kent radio speakers of the 20's & 30's.  The base even looks similar. Yep replacing the gear is going to be the tough part.


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 Posted: Sun Feb 18th, 2018 03:54 pm
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Keith Spence
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Sorry forgot to answer it is induction no brushes.

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 Posted: Sun Feb 18th, 2018 05:21 pm
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Tom Nordin
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Keith Spence wrote: Purely a guess on my part but it seems like they designed it to look similar to the Atwater Kent radio speakers of the 20's & 30's.  The base even looks similar. Yep replacing the gear is going to be the tough part.



You beat me to the punch, Keith - exactly what I thought at first glance.

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 Posted: Sun Feb 18th, 2018 05:45 pm
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Steve Butler
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Crosley speaker. 

Attached Image (viewed 208 times):

F520AA5E-F9FA-4050-8C94-EF0DDD0B8B7C.jpeg

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 Posted: Sun Feb 18th, 2018 06:15 pm
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Tom Nordin
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Steve Butler wrote: Crosley speaker. 
Look at that - practically identical.  Nice find, Steve!

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 Posted: Sun Feb 18th, 2018 11:11 pm
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Keith Spence
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Wow it is an almost identical grill pattern to the Crosley and from the little bit of finish left on the back of gear box it has the same crinkle finish as the Crosley.

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 Posted: Mon Feb 19th, 2018 12:01 am
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Duane Burright
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Neat that you got it running again.

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 Posted: Mon Feb 19th, 2018 02:44 am
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Lamar Bass
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Keith, here is one which I picked up in Pensacola, Fl. a few months back. Incomplete cage, no blades, and no hope, but

I liked the looks of it.

Attached Image (viewed 156 times):

IMG_1557.JPG

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 Posted: Mon Feb 19th, 2018 02:45 am
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Lamar Bass
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#2

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IMG_1558.JPG

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 Posted: Mon Feb 19th, 2018 02:53 am
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Keith Spence
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Hello Lamar, if you decide to part it out I would definitely be interested especially if the gears inside are still usable.

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 Posted: Mon Feb 19th, 2018 03:59 am
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Lamar Bass
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I will try to check them

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 Posted: Fri Feb 23rd, 2018 02:01 pm
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Keith Spence
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David you called it right on the electromagnetic interference suppression. I was searching old ads to find the original color and found this "can be operated near a radio set without interference" Ad was 1931.

Keith

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