To describe it more simply in the words of the patent office ” This invention relates to a new or improved frame for a motorcycle which comprises two substantially parallel rectangular loops each formed from a single length of (40 feet) tubing, and the ends of the tube forming each loop cross and are welded to each other at the top front corner of the loop, the free ends of the tube which extend beyond the crossing point being welded to the side of an inclined head tube adjacent to the top and bottom thereof. What you just read above, was an excerpt from the patent that was awarded to Norton Motors Limited & Richard McCandless in 1949. The plates ‘q’ also carry means for supporting the rear wheel. The member ‘m’ has lugs ‘p’ through which passes a spindle forming an anchorage for the front end of the engine plates and gusset plates ‘q’ carry a spindle forming the rear anchorage.
A fuel tank is detachably connected to lugs ‘n’ on the members ‘j’, ‘k’.
The two loops are rigidly connected at spaced points by transverse tubular members ‘j’, ‘k’, ‘l’ (not shown) and ‘m’, the members ‘j’, ‘l’ (not shown ‘m’ being welded directly to the loops and the member ‘k’ to lugs welded to the loops. A motor-cycle frame comprises two loops ‘a’, ‘b’ each formed from a single length of tubing, the ends of the tube which forms each loop crossing and being welded to each other at ‘f’ and the free ends of the tubes which extend beyond the crossing point being welded to a head tube ‘d’ at ‘e’ and ‘g’.
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