السبت، 31 مارس 2012

History Of Bicycle



Wooden draisine (around 1820), the first two-wheeler and as such the archetype of the bicycle

The Draisienne, Laufmaschine, or dandy horse was the first human means of transport to use only two wheels in tandem and was invented by the German Baron Karl von Drais. It is regarded as the forerunner of the modern bicycle and was introduced by Drais to the public in Mannheim in summer 1817 and in Paris in 1818.[10] Its rider sat astride a wooden frame supported by two in-line wheels and pushed the vehicle along with his/her feet while steering the front wheel.
Michaux' son on velocipede 1868
Thomas McCall in 1869 on his velocipede

The first mechanically-propelled 2-wheel vehicle may have been built by Kirkpatrick MacMillan, a Scottish blacksmith, in 1839, although the claim is open to dispute.[11] He is also associated with the first recorded instance of a cycling traffic offence, when a Glasgow newspaper reported in 1842 an accident in which an anonymous "gentleman from Dumfries-shire... bestride a velocipede... of ingenious design" knocked over a little girl in Glasgow and was fined five shillings.[12]

In the early 1860s, Frenchmen Pierre Michaux and Pierre Lallement took bicycle design in a new direction by adding a mechanical crank drive with pedals on an enlarged front wheel (the velocipede). Another French inventor by the name of Douglas Grasso had a failed prototype of Pierre Lallement's bicycle several years earlier. Several inventions followed using rear wheel drive, the best known being the rod-driven velocipede by Scotsman Thomas McCall in 1869. The French creation, made of iron and wood, developed into the "penny-farthing" (historically known as an "ordinary bicycle", a retronym, since there was then no other kind).[13] It featured a tubular steel frame on which were mounted wire-spoked wheels with solid rubber tires. These bicycles were difficult to ride due to their very high seat and poor weight distribution. In 1868 a Michaux cycle was brought to Coventry, England by Rowley Turner, sales agent of the Coventry Sewing Machine Company (which soon became the Coventry Machinist Company). His uncle, Josiah Turner, together with business partner James Starley used this as a basis for the 'Coventry Model' in what became Britain's first cycle factory.[14]
A penny-farthing or ordinary bicycle photographed in the Škoda Auto museum in the Czech Republic
Bicycle in Plymouth, England at the start of the 20th century

The dwarf ordinary addressed some of these faults by reducing the front wheel diameter and setting the seat further back. This necessitated the addition of gearing, effected in a variety of ways, to efficiently use the power available. However, having to both pedal and steer via the front wheel remained a problem. J. K. Starley (nephew of James Starley), J. H. Lawson, and Shergold solved this problem by introducing the chain drive (originated by the unsuccessful "bicyclette" of Englishman Henry Lawson),[15] connecting the frame-mounted cranks to the rear wheel. These models were known as dwarf safeties, or safety bicycles, for their lower seat height and better weight distribution. (Although without pneumatic tires the ride of the smaller wheeled bicycle would be much rougher than that of the larger wheeled variety.) Starley's 1885 Rover, manufactured in Coventry, England,[16] is usually described as the first recognizably modern bicycle. Soon, the seat tube was added, creating the double-triangle diamond frame of the modern bike.

Further innovations increased comfort and ushered in a second bicycle craze, the 1890s' Golden Age of Bicycles. In 1888, Scotsman John Boyd Dunlop introduced the first practical pneumatic tire, which soon became universal. Soon after, the rear freewheel was developed, enabling the rider to coast. This refinement led to the 1890s invention[17] of coaster brakes. Derailleur gears and hand-operated cable-pull brakes were also developed during these years, but were only slowly adopted by casual riders. By the turn of the century, cycling clubs flourished on both sides of the Atlantic, and touring and racing became widely popular.

Bicycles and horse buggies were the two mainstays of private transportation just prior to the automobile, and the grading of smooth roads in the late 19th century was stimulated by the widespread advertising, production, and use of these devices

Omega Pharma-QuickStep with “110 options” for Tour of Flanders

Tom Boonen (Omega Pharma-QuickStep) won Gent-Wevelgem for the third time in his career
The team has a stunning 23 wins so far this season, with five of them coming in the last ten days. Niki Terpstra opened the streak by winning Dwars Door Vlaanderen, followed by Tom Boonen's wins in the E3 Prijs Vlaanderen-Harelbeke and Gent-Wevelgem. Sylvain Chavanel topped things off by winning the closing time trial of the Three Days of De Panne-Koksijde to take the overall win.

Chavanel had not been feeling well earlier, which affected his performance n Paris-Nice and kept him out of Milan-San Remo. His health problems “are completely behind him,” Peeters said.

Boonen is going into Sunday's race as top favourite and team captain, but his teammates will also be very present. Peeters likes that. “I prefer a team that is strong in with.”

How might the race go, and what will the team plan? “There are 110 scenarios for Sunday. I have something in mind and Saturday night we will sit around the table. We obviously want as many riders in the finals as possible and want to make no mistakes.

"The course is also a factor. This is new for everyone," Peeters added. “"For now it is conjecture what the course will be like. Before, you knew: we take 50 (riders) to the Muur (van Geraardsbergen) and break it open. Now that can happen anywhere.

Chavanel continues Omega Pharma-QuickStep winning streak


the concluding time trial. In spite of the extraordinary haul of 21 victories secured by his teammates in the opening three months of the season, Chavanel was surprisingly still itching to get off the mark when he rolled down the start ramp in De Panne.

"It's always a relief when you bring wins to the team," Chavanel said in his post-race press conference. "I'm here to win races for the team and I've won two in one day, so I'm really happy. The team already had more than 20 wins and I was one of the riders who had yet to open his account."

After surgery to correct a herniated disc during the winter, Chavanel was concerted in his off-season efforts to regain his time trialling form. The fruits of his labour were apparent on Thursday, when he put four seconds into Lieuwe Westra (Vacansoleil-DCM) and a remarkable 17 into Svein Tuft (GreenEdge) on the 14.7km course to take the stage and the overall victory.

"It was my third time trial of the year. I was 4th in the time trial at San Luis and 6th at Paris-Nice, so I was so proud to win this one, especially as I was up against Westra, Tuft and Durbridge, guys who are good rouleurs."

The Tour of Flanders dominates Flemish thoughts as March turns to April, and in spite of Chavanel's protestations, there was more interest at the press conference in dissecting his Ronde chances than in discussing his first victory since the French national championships last June.

Chavanel's display on Thursday also saw him reel in Omega Pharma-QuickStep's 22nd and 23rd victories of the season. Their haul to date is just two shy of the team's entire tally for the past two years combined; a frankly astonishing turnaround after their travails last spring.

Given the performances of Boonen, Terpstra, Chavanel et al on the cobbles over the past week or so, there is a discernible sense of expectation about what Omega Pharma-QuickStep might achieve on Sunday. "There are a lot of riders who are in condition on the team, almost everybody," Chavanel acknowledged. "You can't escape the fact that we have a very strong team when you look at our recent results, but there are a lot of strong teams."

A lot of strong teams, but one particularly potent individual. Might the nature of Chavanel's victory have sounded a warning of sorts to Fabian Cancellara (RadioShack-Nissan)?

"I don't think he's afraid of anyone," Chavanel said.

While Cancellara and Boonen opted to forgo De Panne and rest up for Sunday, Chavanel was happy to keep racing through the week, reluctant to change a formula that came agonizingly close to paying off in full last April.

"Last year I came here and then I was second at the Tour of Flanders, so I didn't want to change my programme. I'm a rider who can take on efforts like this quite well, and in the past there have been riders who have ridden De Panne and then done very well on Sunday.

"This year it's a bit mitigated also as we had an exceptional De Panne because of the good weather, so it's been a little stressing but not enormously so."

After missing Milan-San Remo due to illness, Chavanel has recovered to play a starring role on the cobbles in the past week. He first marshalled Niki Terpstra to victory at Dwars Door Vlaanderen, and then aided Boonen at Harelbeke before helping himself to De Panne for good measure.

"I started the classics period at Waregem, I wasn't bad," Chavanel said, smiling at his understatement. "At Harelbeke too, I wasn't bad. And here at De Panne, I wasn't bad either.