Bicycle Technology and Patents » Drivetrain & Gearing

Joules, the cycling robot

shaver — Wed, 23 Dec 2009 15:59:01 +0000

Specifically, Joules is a robotic stoker for your tandem bike, when you are riding solo on a tandem.

This project definitely has a steam punk flair, and combines some art, whimsy, and a good deal of engineering. Joules was built by engineer Carl Morgan with his son, a former pro cycling racer. The web page with more information on Joules is here.

Carl has a great U tube video also, linked below.

Front Wheel Drive Recumbent, 1950

shaver — Mon, 26 Oct 2009 22:54:23 +0000

What is the big deal about front wheel drive recumbents? Here is one that is really cool, from 1950. It has an internally geared hub, and a very stylish body. This would be a cool bike!

Early FWD Recumbent

shaver — Thu, 22 Oct 2009 21:34:02 +0000

Thomas Traylor’s 1982 design patent for a front wheel drive two wheeled recumbent, very similar in design to a Cruzbike Silvio. Considering Maria Parker’s new 12 hour record, set on a Cruzbike, maybe Traylor was ahead of his time!

Rear Suspension Bike, 1891

shaver — Thu, 02 Jul 2009 01:44:00 +0000

Here is a rear suspension bike from 1891 which used springs in a tube to give some give to the rear wheel.

Harry Lawson’s Bicyclette

shaver — Sat, 27 Jun 2009 01:00:00 +0000

James Starley’s Rover of 1885 was the first successful bike in which pedals and a crank drove the rear wheel with a chain, but he was not the first with that design. In 1879 Englishman Harry Lawson designed and patented a version of a large front wheeled bike with a smaller rear wheel driven by cranks and a chain. Lawson’s bike was not very well received, and he went on to design bikes using levers for power transmission. The Bicyclette was a commercial failure, but he had hit upon a superior design feature.

This artwork of the Bicyclette is a version featured on cigarette cards. This and other bicycle art is found at bicyclegifts.com. Framed versions of these beautiful cigarette cards, posters , cards, and other bicycle art recognize that brilliant design is art.

The First Rear Suspension Bike, 1891

shaver — Sat, 20 Jun 2009 01:30:00 +0000

Here is another candidate for the first rear suspension bicycle design, from 1891. Its modern counterpart is shown below.

Facing Bottom Bracket Shells on the Catrike

shaver — Sun, 07 Jun 2009 04:48:42 +0000

Yesterday I did a bottom bracket shell facing and thread cleaning job on Bob Shaver’s Speed. I took lots of pics of the job showing the steps in getting clean faces on each end of the shell.

After reading the text below each pic, it’s very interesting to watch them all in slideshow mode. The progress shows up much better that way.

This is the bottom bracket face before it was faced, showing the layer of powdercoat. The external bearing cups press down on this face, and if it is not perfectly flat the bearings are cocked to one side.

This is the Park tool for facing the bottom bracket faces.

This is the cutting tool cutting away the powdercoat layer, and a tiny bit of metal.

This is the face showing slight chatter marks from the tool.

The chatter marks are smoothed off and the face made perfect with emery cloth pressed in by the cutting tool.

The face after the final smoothing and polishing.

This facing of the bottom bracket edge is part of Bob’s upgrade to ceramic bearings in the BB. They are typically much tighter than the steel bearings that come in most bottom brackets, so they will not tolerate as much misalignment as the steel bearings. This is why the faces of the shell must be absolutely parallel with each other and perpendicular to the axis of the bottom bracket spindle when converting to ceramic bearings. The Park Tools threading and facing tool is a very precise piece of equipment that does a beautiful job of truing up a BB shell, even if it is very expensive. Most shops will do this job for about $50 if they have the tool, but most mechanics, in fact very few, know how to do the job correctly. They usually leave the chatter marks. That’s OK, actually, as long as they are even all the way around the face.

As can be seen in some of the pics in Bruce’s flicker photos (linked below), a lot of powder coating gets deposited on the surfaces where the bearing cups tighten. This uneven buildup causes the cups and bearings to cock sideways, as the powder coat is never perfectly smooth. Cheaper and sloppier steel bearings will absorb a lot of this alignment displacement, but better ceramic bearings won’t, and it will often cause bind in the better, tighter bearings. Pictures iL1, L2 and L3 in Bruce’s flicker pics show the non-drive side of the BB shell with a huge buildup of powdercoating. This is enough to cause bind in even a steel bearing. If you look really close at these pics, you can also see the only three small areas of contact that the bearing cup had with this face!

Besides the powder coating buildup, warpage from welding will distort the shell faces. This is shown in the pics as small areas at a time of bare aluminum showing up as cutting progresses. If they had been absolutely true from the start, the aluminum would have shown up all at once as soon as the powdercoating was removed.

If any Catrike riders intend to put ceramics in your BB, or you feel some resistance and just want to feel sure about your’s, and your lbs can’t do this job. Contact Bruce and if you ask nicely he may do it for you. You will need to send him your bare boom/BB and return postage. (Oh, and a pan of brownies!)(Hey! it never hurts to ask!) Contact Bruce at rbb@antelecom.net

This is the link to Bruce’s pics on flickr

Bruce

P.S. mikeatlbch made a comment that jogged Bruce’s memory, and he is right. mikeatlbch notes that facing the bb is needed only for external bearings, not for cartridge bearing assemblies. Thus the Speed, Expedition, and 700 model Catrikes, which all have external bearing assemblies, need to be faced. Other Catrike models or any bike/trike with cartridge bearings don’t need to be faced.

Gear Shift Bike, 1897

shaver — Sat, 23 May 2009 15:13:25 +0000

Even after bikes were built using chains, other power transmission modes were tried in early years and continue to be tried today. The chain is just so efficient its hard to beat. An early alternative to the chain and gears utilized a drive shaft. Some added gears to the drive shaft to form a transmission like the early cars were using. This one from 1897 even had a shift lever and a real transmission and a drive shaft that operated with bevel gears to the rear wheel. Having machinery and machinists capable of making bevel gears and transmissions such as this made the transmission to automobiles much smoother and faster.

1869 Tadpole Recumbent Trike

shaver — Wed, 20 May 2009 16:11:07 +0000

This figure from a U.S. patent from 1869 shows a tadpole recumbent trike. It is powered by the user’s hands and feet. The feet work a treadle, and the hands work the rods. Rod and lever propulsion was common in those days, because reliable chains had not been developed yet, and the crank and chain was not proven as the best way to transfer power. This wheel and frame configuration is about 140 years ahead of ahead of the Catrike and other trikes, which have similar frame and wheel configuration.

Jarvis Recumbent Bike, 1902

shaver — Mon, 11 May 2009 15:03:26 +0000

This was not the first recumbent bike, but it is certainly an early one. I have no information that this was ever built, but it sure was ahead of its time. It is very similar to long wheel base recumbents on the road today.