Author Topic: speedo drive  (Read 168 times)

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Offline bangers-c10

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speedo drive
« on: January 30, 2019, 04:34:58 am »
Hi, is it Normal to have a speedo drive that says ..Patent applied for..   or do they normally have a number.. thanks guys.

Offline timsdad

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Re: speedo drive
« Reply #1 on: January 30, 2019, 06:48:36 am »
I've seen it stamped on lots of parts over the years so I don't think it has any great significance. Just getting round copyright laws, I suppose.


Ray
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Offline stev60

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Re: speedo drive
« Reply #2 on: January 30, 2019, 07:38:32 am »
dosent really mean anything , way back patent pending was put on parts, to protect the part being copied now im sure any part from any place , could have it, if its a speedo drive  could be from India, I bought one from there and it works fine

Offline bangers-c10

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Re: speedo drive
« Reply #3 on: January 30, 2019, 01:07:46 pm »
Thanks, although its off my 39 c10,  thought it would of had numbers,

Offline timsdad

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Re: speedo drive
« Reply #4 on: January 30, 2019, 02:30:36 pm »
I think they're a bought-in Smith's part, supplied to BSA along with their speedos and rev counters.


Ray
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Offline bangers-c10

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Re: speedo drive
« Reply #5 on: January 31, 2019, 01:18:57 am »
Thanks guys..

Offline timsdad

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Re: speedo drive
« Reply #6 on: January 31, 2019, 07:09:33 am »
These war-time models were the first to have the new, fully-enclosed speedo drives mounted on the wheel spindle, bangers, so it's not surprising it doesn't have the official patent number on. It was listed as a new feature in the 1940 sales literature, printed in 1939 for the models leaving the factory after about October 1939.


Ray
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Offline bangers-c10

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Re: speedo drive
« Reply #7 on: January 31, 2019, 07:41:04 am »
Ahh i see, that makes sense ,  someone wanted to buy mine and asked whats the number on it, hence why i couldnt find one..

Offline timsdad

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Re: speedo drive
« Reply #8 on: January 31, 2019, 08:35:33 am »
Seems a picky thing to ask, bangers! Unless they're quite knowledgeable about the model and knew that these speedo drives came in with the 1940 brakes, later B20-type girder forks and one piece handlebars.

They may have just been checking if the front end was original.


Ray
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Offline bangers-c10

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Re: speedo drive
« Reply #9 on: January 31, 2019, 08:55:51 am »
dunno mate, maybe after a serton type, i will ask him..

Offline timsdad

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Re: speedo drive
« Reply #10 on: January 31, 2019, 11:35:37 am »
If you're just selling the speedo drive then the part numbers vary for the different ratios. I thought at first you were selling the complete C10 and he wanted to know about the speedo drive. The ratio is how many revolutions the cable will do to each complete turn of the input drive.

Ray
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Offline Owen

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Re: speedo drive
« Reply #11 on: January 31, 2019, 01:11:29 pm »
Don't forget the hole size varies with the bike.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline bangers-c10

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Re: speedo drive
« Reply #12 on: January 31, 2019, 01:13:17 pm »
Noo id never sell the C10,   cheers guys..