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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seat Failure
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<blockquote data-quote="timetraveller" data-source="post: 46862" data-attributes="member: 456"><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">There is a very easy way to understand this. Imagine taking the seat off a ‘B’ or ‘C’ and replace the two original seat stays with two lengths of rod, fastened to the rear of the pillion footrest plates and free to pivot about their lower fixings. Now imagine two pieces of string passing through the original front pivot holes and fastened to the top of each of these two rods. The only thing that would stop the rods rotating backwards if one pushed downwards on them would be the two pieces of string. That is like the ‘D’ set up. Everything is in a straight line and, ignoring any weights applied downwards on the string such as a loaded seat, and then everything is in tension. Now imagine putting two bits of steel protruding vertically about 2” from each end of the forward pivot hole and fasten the two pieces of string fastened to their upper ends. Now pull the tops of the two rear rods backwards and downwards. What will happen to the front two bits of 2” long bits of steel? Right, they are no longer vertical and that is why the seat frames fail.</span></span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 46862, member: 456"] [SIZE=3][COLOR=#000000][FONT=Calibri]There is a very easy way to understand this. Imagine taking the seat off a ‘B’ or ‘C’ and replace the two original seat stays with two lengths of rod, fastened to the rear of the pillion footrest plates and free to pivot about their lower fixings. Now imagine two pieces of string passing through the original front pivot holes and fastened to the top of each of these two rods. The only thing that would stop the rods rotating backwards if one pushed downwards on them would be the two pieces of string. That is like the ‘D’ set up. Everything is in a straight line and, ignoring any weights applied downwards on the string such as a loaded seat, and then everything is in tension. Now imagine putting two bits of steel protruding vertically about 2” from each end of the forward pivot hole and fasten the two pieces of string fastened to their upper ends. Now pull the tops of the two rear rods backwards and downwards. What will happen to the front two bits of 2” long bits of steel? Right, they are no longer vertical and that is why the seat frames fail.[/FONT][/COLOR][/SIZE] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seat Failure
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