Quick release skewer

As a quick release or quick clamping device clamping devices are referred to, which dissolve quickly and usually without tools by hand or fix (tension ) can.

They are very common in machine tools to hold workpieces during machining or to secure closures to containers, as well as of bike parts, such as the wheels or seat posts on the frame or fork.

Quick release wheels for the bicycle

Quick Release Bicycle

The quality is measured primarily by its terminal effect. Cheap models use some plastic rings, which may develop during sporty driving, or by the high burden to a safety risk.

History

The quick release were invented in 1930 by Tullio Campagnolo and patents pending. He has lost a race in 1927 because of changing a wheel by means of wing nuts precious time, then this was the only way to select by turning the rear wheel a different translation. In the patent, the quick releases were called at that time " gear for cycling ".

Problems

Quick release wheels to make it possible to expand this very quickly. To remove an existing rim brake only has relaxed and the switching mechanism of the derailleur be pulled back at the rear wheel. Some hubs disassembly is more difficult. Torque arms and shift cables often hinder the rapid expansion of the wheel.

Theft

The fast operation makes it easy to thieves to steal components of the bicycle in seconds. That's why Quick -release axles are offered, which can only be opened with special keys. Casual thieves are deterred, but specialists can remove such fuses quickly with simple means.

Operation

Usually a quick release uses a cam, which is operated by a lever. The high tensile stress caused correspondingly high frictional forces, so that the lever does not resolve by itself. With a very smooth quick release of the eccentric is rotated about the maximum deflection ( pressure point ) out before it rests on the frame or fork, so that it is fixed by the tension of the tension axis in the closed position.

For jigs, there is the German DIN standard DIN 6348th

Operation

To remove the impeller of the Quick Release lever is pulled down, which sometimes requires a high force. Then usually the lever opposite nut must be tightened and held the lever with the quick release axle are swung around a few turns counterclockwise so that the wheel can lift it out of the dropout.

When installing the lever after the onset of the impeller is clockwise around swinging ( nut on the opposite side while holding ). The correct setting is achieved when the lever is then put around without any effort until it is at an angle of 90 degrees to the plane of the wheel. Finally, it is completely wrapped with force until it rests flat as possible on the frame or fork. He should be doing directed backwards, so that it does not go unnoticed dissolves when one touches an obstacle with the bike, and so no cords, lines, wires or even garments are entrained in the dense ( pedestrian ) traffic.

Modern sports bikes with derailleur usually have vertical rear dropouts in which the wheels do not have to be aligned. Bikes with hub gears, as well as many simple and some racing or touring bikes have rear oblique or horizontal dropouts to adjust the chain tension by moving the rear wheel can. Here provide adjustment screws which are screwed into the dropout, or after insertion of the wheel like a washer over the axle pushed chain tensioner, the exact orientation