This is the CCM Triplex "hanger" and my catalogue scans show it on bikes as early as 1921. They used the Triplex hanger up to WWII, as well as the traditional cottered cranks and 1 piece roadster cranks.
Hugh, your Flyer dates to 1930.
Warren Young Toronto
Hughethornton@aol.com wrote:
> In a message dated 22/02/05 21:42:40 GMT Standard Time, vahdia@att.net
> writes:
>
>
>>In Canada,starting in the thirties,CCM did a really cool steel cotterless
>>on the real track bikes that has a triangular taper instead of square.
>>
>
>
> Does anyone know for sure when the CCM cotterless cranks were introduced? My
> CCM Flyer has these cranks and was supposedly produced in the late twenties.
> The serial number of the bike appears to be something like P11949, if anyone
> can suggest a date from that.
>
> Hugh Thornton
> Cheshire, England