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Old 02-21-07, 02:23 PM   #1
old_alfie
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3-spd hubs back arouond 1970?

I'm talking to a man who owns a 3-spd Huffy which he bought new in 1972. His hub markings only read ""THREE SPEED HUB F" and "USAPAT3021728". " and that's it. The shifter is a twist-grip and since he is the original and only owner I take his word that what is there is what was original to the bike.

My question arises because although I was well into adulthood in 1970, all this time I just assumed that every 3-spd bike back in those days used a Sturmey Archer or a licensed version which somehow still reflected S/A in the hub markings.

How wrong am I? Anybody who can place this into perspective for me?
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Old 02-21-07, 02:32 PM   #2
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Shimano made three speed hubs in the sixties and seventies. They did use them on Huffy bikes.
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Old 02-21-07, 03:39 PM   #3
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U.S. Patent 3,021,728 for "Three Stage Speed Change Mechanism for a Bicycle" was issued to Keizo Shimano on February 20, 1962.
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File Type: jpg 003021728-1.jpg (67.7 KB, 56 views)
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Old 02-21-07, 03:45 PM   #4
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See if you can get a picture of the hub... the shimano all used a bellcrank system as far as I know. The S-A 3 speeds all have the indicator chain. I know S-A did allow several companies to make them under license.

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Old 02-21-07, 04:04 PM   #5
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So SHIMANO it is

Thanks guys and especially for the patent dwg. I never would've thought of using the internet to go backward from the patent number, thanks for that. Thanks all who responded and I passed on the comments to the guy with the bike so he'd better know what he has.
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Old 02-21-07, 06:04 PM   #6
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Quote:
Originally Posted by Scooper
U.S. Patent 3,021,728 for "Three Stage Speed Change Mechanism for a Bicycle" was issued to Keizo Shimano on February 20, 1962.
That is a great diagram, thanks for posting

I think I'm going to have to look at some other sources before I can figure out how it works
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Old 02-21-07, 09:49 PM   #7
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Just got done working on a 1970s-era Fuji Avalon 3 speed with the Shimano hub. It's on the left side of the rear hub, and SA was on the right side.
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Old 02-21-07, 11:56 PM   #8
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Quote:
Originally Posted by lebowitz
That is a great diagram, thanks for posting

I think I'm going to have to look at some other sources before I can figure out how it works
The patent documents for the Shimano hub are only four pages; two are drawings and the other two describe the way the hub works.

You can download patent documents free online from the Patent Office Web Site. The documents are in TIFF format, so you'll need a TIFF reader. I use IrfanView to view the TIFF pages and convert them to JPG files.
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Old 02-22-07, 03:53 AM   #9
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Quote:
Originally Posted by zonatandem
Just got done working on a 1970s-era Fuji Avalon 3 speed with the Shimano hub. It's on the left side of the rear hub, and SA was on the right side.
Would that be a coaster brake hub? I have found on the Shimano's that I have the Coaster brake 3 speeds the shift mechanism is on the left side of the hub, the regular Shimano 3 speed is on the right like the S-A I have serveral of each. Biggest problem to me with the Shimano is the parts availability...there aren't any. I could use a couple of shifters and have had zero luck in finding any.

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Old 02-22-07, 06:14 AM   #10
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Did Shimano use the same ratios as the Sturmey-Archer AW? I am putting together a Kabuki with a Shimano 3 speed hub (that came from a Huffy) and I was curious what the ratios might be.
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Old 02-22-07, 01:11 PM   #11
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Quote:
Originally Posted by Pompiere
Did Shimano use the same ratios as the Sturmey-Archer AW? I am putting together a Kabuki with a Shimano 3 speed hub (that came from a Huffy) and I was curious what the ratios might be.
The 2 Shimano 3S hubs I have (78 & 79) are both 3/4, 1/1, 4/3.
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