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#1
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Frame liners?
I'm reading a cycling book published in 1900 (I'm trying to catch up)
by C. L. Freeston, titled, Cycling In The Alps With Some Notes On The Chief Passes http://www.archive.org/stream/cyclin...ge/n8/mode/2up In the appendices he relates a story of a broken frame on a tandem, how the broken tube revealed that the frame's tubes were thin and did not have liners, and that this was an egregious mistake. What are frame liners? I'd guess they were tubes inside the tubes, but in that case why didn't they just use thicker tubes to start? He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. Have there been any brakes in recent memory that had/have that feature? The book has some nice illustrations of the various passes and is a fun read. R |
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#2
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Frame liners?
RicodJour wrote:
I'm reading a cycling book published in 1900 (I'm trying to catch up) by C. L. Freeston, titled, Cycling In The Alps With Some Notes On The Chief Passes http://www.archive.org/stream/cyclin...ge/n8/mode/2up In the appendices he relates a story of a broken frame on a tandem, how the broken tube revealed that the frame's tubes were thin and did not have liners, and that this was an egregious mistake. What are frame liners? I'd guess they were tubes inside the tubes, but in that case why didn't they just use thicker tubes to start? He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. Have there been any brakes in recent memory that had/have that feature? The book has some nice illustrations of the various passes and is a fun read. R I own some cut frame sections from as late as 1960 with a separate steel liner (artsy, like period lugwork) slipped inside a plain gauge seamed tube. I assume these were used in place of butted tube on cheaper models. They are slipped inside a tube with a brass charge, fitted inside a lug and furnace brazed. (Or not. One has an unmelted brass ring inside) I recently replaced two tubes on an 1898 lugged race frame which had very thin (1.0) seamed mild steel tubes. Such liners may have helped or prevented the tube kinks when it crashed. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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Frame liners?
On Fri, 11 Nov 2011 20:01:40 -0800 (PST), RicodJour wrote:
He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. Have there been any brakes in recent memory that had/have that feature? Drag brakes are not uncommon on tandems. They are usually drums or disks these days. I had mine rigged through a barcon (bar end shifter), but you could use probably use a twist-shift. Can you describe what a "Bowman" brake is and how it works? |
#4
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Frame liners?
RicodJour wrote:
He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. *Have there been any brakes in recent memory that had/have that feature? It's not uncommon to have a third brake on a tandem, a rear drum brake usually, that is engaged by a friction shifter such that it remains engaged until shifted back off. As for tubing liners, I can't offer much insight. Materials and processes have evolved greatly since those days, and there may have been some limit on how thick tubing walls could be made in proportion to their diameters. In Archibald Sharp's book from about that time, he describes how the strongest frame steels could not be drawn into tubing, but only rolled into helical tubes made of strip, and layered with tubes of opposite chirality. Chalo |
#5
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Frame liners?
On Nov 11, 11:38*pm, AMuzi wrote:
I own some cut frame sections from as late as 1960 with a separate steel liner (artsy, like period lugwork) slipped inside a plain gauge seamed tube. I assume these were used in place of butted tube on cheaper models. They are slipped inside a tube with a brass charge, fitted inside a lug and furnace brazed. (Or not. One has an unmelted brass ring inside) I recently replaced two tubes on an 1898 lugged race frame which had very thin (1.0) seamed mild steel tubes. Such liners may have helped or prevented the tube kinks when it crashed. Right - got it. A way of butting tubing before tubing was butted. Probably should have been obvious to me, but I was thinking of entirely lined frame tubes. Thanks. R |
#6
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Frame liners?
On Nov 11, 11:54*pm, ERSHC wrote:
On Fri, 11 Nov 2011 20:01:40 -0800 (PST), RicodJour wrote: He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. *Have there been any brakes in recent memory that had/have that feature? Drag brakes are not uncommon on tandems. They are usually drums or disks these days. I had mine rigged through a barcon (bar end shifter), but you could use probably use a twist-shift. I never thought of that. Tandems aren't on my event horizon and I have exactly zero experience with them. Was yours set up with redundant braking? The drum brake and a rim brake? I like the idea of setting a brake like a drag chute. Can you describe what a "Bowman" brake is and how it works? No, I can't, sorry. It was just mentioned in the appendix on equipment. There wasn't any further information, so I asked here. R |
#7
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Frame liners?
On Sat, 12 Nov 2011 10:21:35 -0800 (PST), RicodJour wrote:
On Nov 11, 11:54Â*pm, ERSHC wrote: On Fri, 11 Nov 2011 20:01:40 -0800 (PST), RicodJour wrote: He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. Â*Have there been any brakes in recent memory that had/have that feature? Drag brakes are not uncommon on tandems. They are usually drums or disks these days. I had mine rigged through a barcon (bar end shifter), but you could use probably use a twist-shift. I never thought of that. Tandems aren't on my event horizon and I have exactly zero experience with them. Was yours set up with redundant braking? The drum brake and a rim brake? I like the idea of setting a brake like a drag chute. Yes, a drum (for the drag) and two rim brakes (front and rear) actuated with standard levers. The drum is used for speed control on long decents. The drum did get hot, but that is much better than a rim getting hot and melting the rubber brake shoes or the tire. Can you describe what a "Bowman" brake is and how it works? No, I can't, sorry. It was just mentioned in the appendix on equipment. There wasn't any further information, so I asked here. I wonder if this is a misprint for "Bowden", although that is just the cable setup. |
#8
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Frame liners?
RicodJour wrote:
On Nov 11, 11:54 pm, ERSHC wrote: On Fri, 11 Nov 2011 20:01:40 -0800 (PST), RicodJour wrote: He also mentions a Bowman brake that was engaged with a twist of the wrist, and could be locked to provide constant drag. Have there been any brakes in recent memory that had/have that feature? Drag brakes are not uncommon on tandems. They are usually drums or disks these days. I had mine rigged through a barcon (bar end shifter), but you could use probably use a twist-shift. I never thought of that. Tandems aren't on my event horizon and I have exactly zero experience with them. Was yours set up with redundant braking? The drum brake and a rim brake? I like the idea of setting a brake like a drag chute. Can you describe what a "Bowman" brake is and how it works? No, I can't, sorry. It was just mentioned in the appendix on equipment. There wasn't any further information, so I asked here. R I thought it may have been a garbled version of a Bowden cable brake but then I found this cryptic item: http://trove.nla.gov.au/ndp/del/article/5129550 Although for 'all class weird' there's a Bowman perpetual motion device as well: http://www.fdp.nu/bm-movie/default.html none of which helps with your inquiry -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#9
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Frame liners?
On Nov 12, 2:13 pm, AMuzi wrote:
I thought it may have been a garbled version of a Bowden cable brake but then I found this cryptic item: http://trove.nla.gov.au/ndp/del/article/5129550 Although for 'all class weird' there's a Bowman perpetual motion device as well: http://www.fdp.nu/bm-movie/default.html none of which helps with your inquiry Eliminating things helps narrow it down. I couldn't find anything on the brake either. There was one mention of an electric/magnetic Bowman brake test on a railroad, but that was well after. R |
#10
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Frame liners?
On 12-11-2011 20:49, RicodJour wrote:
On Nov 12, 2:13 pm, wrote: I thought it may have been a garbled version of a Bowden cable brake but then I found this cryptic item: http://trove.nla.gov.au/ndp/del/article/5129550 Although for 'all class weird' there's a Bowman perpetual motion device as well: http://www.fdp.nu/bm-movie/default.html none of which helps with your inquiry Eliminating things helps narrow it down. I couldn't find anything on the brake either. There was one mention of an electric/magnetic Bowman brake test on a railroad, but that was well after. R A great find, thanks for posting. ( but all I could find in the 'purely mechanical' chapter were references to Bowden brakes! ) -- /Marten info(apestaartje)m-gineering(punt)nl |
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