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#1
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Pedersen problem v2.0
I'm the guardian of Helen Vecht's Pederesen, since she is no longer
able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Bugger. Any Pedersen owners out there with a clue as to what's going on? -- Tim I understand very little of what's being discussed but for some reason it's fascinating. (Jon Thompson, urs) |
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#2
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Pedersen problem v2.0
On Thu, 24 Apr 2008 11:18:21 +0100, Tim Hall wrote:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Bugger. Any Pedersen owners out there with a clue as to what's going on? I'd be looking at the other joints, starting with the ones closest. If they are bad you could get that one failing as it tries to take more than it was supposed to. Plastic coating will be trouble though - it probably will be flexible enough that you won't see cracking. What did that cost? |
#4
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Pedersen problem v2.0
In article , _
says... On Thu, 24 Apr 2008 11:18:21 +0100, Tim Hall wrote: I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Bugger. Any Pedersen owners out there with a clue as to what's going on? I'd be looking at the other joints, starting with the ones closest. If they are bad you could get that one failing as it tries to take more than it was supposed to. Plastic coating will be trouble though - it probably will be flexible enough that you won't see cracking. All he has to do is remove the seat posts and wiggle the seat tubes for any other fracture to become apparent, but as the only other joints are where the seat tubes join the bottom bracket[1] I don't think anything will show up. It's notable that on the original Pedersens the two seat tubes were joined at the top, thus triangulating them - I wonder if the provision of separate adjustable seat posts has compromised the rigidity of the structure, subjecting the bridge in question (which originally just held the seat tubes apart) to too much (mostly shear) stress. If that's the case I'd be inclined to braze a plate or crossed tubular bridges between the seat tubes near the top (not very pretty, but should work) to control the movement, or replace the failed bridge with such an arrangement (maybe neater but it would place more stress on the seat tubes). [1] I'm assuming the front mech mount is just a bolt-on. |
#5
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Pedersen problem v2.0
Tim Hall wrote:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Bugger. Any Pedersen owners out there with a clue as to what's going on? sorry no idea, but http://www.flickr.com/photos/timinth...t-721575945092 57998/ that looks rather simular to the handle bars on the old racer i picked up. Which has that detail on them as well as Sakae custom on the other side, which is the brand i guess. Is the Pederesen from the 80's? i've dated my old racer to 1986 from the suntour's derailer stamps. though i have no idea what the bike is it's self as it has a rather funky paint job at some point. google doesn't seem to bring up much or rather much useful any way. roger -- www.rogermerriman.com |
#6
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Pedersen problem v2.0
(Roger Merriman)typed
Tim Hall wrote: I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Bugger. Any Pedersen owners out there with a clue as to what's going on? sorry no idea, but http://www.flickr.com/photos/timinth...t-721575945092 57998/ that looks rather simular to the handle bars on the old racer i picked up. Which has that detail on them as well as Sakae custom on the other side, which is the brand i guess. Is the Pederesen from the 80's? i've dated my old racer to 1986 from the suntour's derailer stamps. though i have no idea what the bike is it's self as it has a rather funky paint job at some point. google doesn't seem to bring up much or rather much useful any way. roger I wonder if the stress on the joint coud be relieved by fasioning a brace between the seat tubes to hold them RIGID. -- Helen D. Vecht: Edgware. |
#7
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Pedersen problem v2.0
Rob Morley wrote:
In article , _ says... On Thu, 24 Apr 2008 11:18:21 +0100, Tim Hall wrote: I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ Riding it theother night, I noticed the joint has sprung again. Any Pedersen owners out there with a clue as to what's going on? I'd be looking at the other joints, starting with the ones closest. All he has to do is remove the seat posts and wiggle the seat tubes for any other fracture to become apparent, but as the only other joints are where the seat tubes join the bottom bracket[1] I don't think anything will show up. It's notable that on the original Pedersens the two seat tubes were joined at the top, thus triangulating them - I wonder if the provision of separate adjustable seat posts has compromised the rigidity of the structure, subjecting the bridge in question (which originally just held the seat tubes apart) to too much (mostly shear) stress. If that's the case I'd be inclined to braze a plate or crossed tubular bridges between the seat tubes near the top (not very pretty, but should work) to control the movement, or replace the failed bridge with such an arrangement (maybe neater but it would place more stress on the seat tubes). Hmm. Looking at it from an intuitive persecrtive I would think that joining the seat tubes rather more robustly at their ends is a Good Idea [TM] The loading on the bridge from the riding motion must be beyond it. -- Phil Cook looking north over the park to the "Westminster Gasworks" |
#8
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Pedersen problem v2.0
Tim Hall wrote:
I'm the guardian of Helen Vecht's Pederesen, since she is no longer able to ride it. A couple of years ago, one of the joints came apart, so I got it repaired at Chas Roberts. This knackered the slightly tatty paintwork so I then got it plastic coated. Photos are he http://www.flickr.com/photos/timinth...7594509257998/ I have a secret yearning for one of those. I must resist... |
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