datasheets.com EBN.com EDN.com EETimes.com Embedded.com PlanetAnalog.com TechOnline.com  
Events
UBM Tech
UBM Tech

Design Article

Comment


JHankwitz

11/21/2012 3:07 PM EST

I'm still using two Oster Fondue pots from 1970 which are basically electric fry ...

More...



Streetrodder

11/23/2011 2:11 PM EST

I have a Sunbeam combo cooker/deep fryer and an Oster blender that my parents ...

More...

The West Bend No. 1 electric-frying-pan thermostat

Paul Rako

10/21/2010 1:00 PM EDT

 View as PDF

The West Bend No. 1 electric-frying-pan thermostat imageAbout 15 years ago, I bought a Grants electric frying pan on eBay for $10. Recently, the knob of the pan’s West Bend thermostat stopped turning. Knowing that putting pliers to it would only break the knob or strip the knurling, I opted instead to disassemble the unit. The threaded shaft that the knob operated had dried out and seized. Lubricating the threads with Tri-Flow fixed the thermostat. The thermostat also has a neon light that had stopped operating due to age. When I shined a bright light on the failed neon lamp, it started working again because the light preionizes some of the noble gases inside the lamp. The lamp stopped working when I reassembled the unit because it was mostly shielded from ambient light.

The West Bend No. 1 electric-frying-pan thermostat image 2
Prying off the metal label revealed a dreaded sight: a snap ring designed only to go on, not come off for service. I managed to pry the ring off with a 0.4×2×60-mm, flat-blade Stahlwille screwdriver. A spring holds the knob against the body as the central shaft moves in and out. I glued the label back on with silicone aquarium cement.

1. A neon light with a series dropping resistor is wired across the two output terminals so that the lamp glows when the thermostat closes and power travels to the pan’s heating element.

2. A loop of wire over one of the three screw bosses serves as a wire-strain relief. The bottom cover has bumps that clamp the wire when it is assembled.

 Read More
Prying Eyes write-ups
3. The knob seized because lack of lubrication caused the threads in the metal frame to seize. To free up the threads, I sprayed them with Tri-Flow spray lubricant and carefully worked the knob back and forth in small increments, using pliers when necessary. When the threads were properly lubricated, I could turn the knurled shaft with my fingers.

The West Bend No. 1 electric-frying-pan thermostat image 4

The West Bend No. 1 electric-frying-pan thermostat image 54. The steel tube that inserts into the frying pan has a bimetallic element that operates the contact points as it bends with applied temperature.

5. A bare braided wire allows heat from the barrel contact to dissipate before it reaches the thermostat assembly.

6. Rotating the temperature knob pushes the lower contact leaf closer to or farther from the bimetallic spring. When the lower leaf is far from the bimetallic spring, it must heat up more to bend far enough to open the contact points.

7. Applying a few spritzes of DeoxIT liquid on the contacts cleans, protects, and lubricates them when they engage the pins on the frying pan. I found a business card, from an honored competitor, with a good abrasive texture and cut it into strips that I ran between the contact surfaces after I applied the DeoxIT.




dick_freebird

10/21/2010 3:08 PM EDT

We finally had to throw out our "heirloom" West Bend
electric frypan because this controller finally
went bad.

Not for what you describe, but the thing is an
exemplary corrosion cell. One (do not) immersion
and days later every steel part was a rust chunk
and every copper-to-brass spot weld in the electrical
path had come loose. No saving it. Bummer.

Sign in to Reply



anonymous user

10/21/2010 5:42 PM EDT

I love Deoxit, but it is difficult to get in Australia :(

Sign in to Reply



anonymous user

10/22/2010 12:08 AM EDT

Interesting... this must be one of the first products on ebay....because it started in 1995 :)

Sign in to Reply



WKetel

11/19/2011 5:36 PM EST

Things that are quite old are often sold on EBAy, so purchasing it there does not indicate age. I have had to repair similar thermostatic assemblies on quite a few occasions, the faults were either dirty connections or failed power cords. They are tedious to solder, it really needs a higher temperature alloy. Originally all the connections are welded. But it is usually possible to get these sorts of appliances to last decades, if you never soak them. Keep the control dry, wash and dry the rest, and never soak them. Sometimes the aluminum may be slightly porous.

Sign in to Reply



Streetrodder

11/23/2011 2:11 PM EST

I have a Sunbeam combo cooker/deep fryer and an Oster blender that my parents received as wedding presents. BTW, I'm 55 years old. The old bimetal thermostat still works on the cooker. I still use it sometimes, the oster still works as well, but I don't use it much - it's single speed (on-off).

Sign in to Reply



JHankwitz

11/21/2012 3:07 PM EST

I'm still using two Oster Fondue pots from 1970 which are basically electric fry pans with fitted pots on them. They still work great, just as my 12-speed Osterizer purchased at the same time and used every day since.

Sign in to Reply



Please sign in to post comment

Navigate to related information

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)