Different Types of Fasteners Used in Bicycles

Topics: Screw, Locknut, Jam nut Pages: 6 (2062 words) Published: February 25, 2011

Different types of fasteners used in a bicycle


Name :- Muhammad Ayman zaheer

Reg :- 2008155


A bicycle is an engineering device that is used as a means of travelling.It is a single person operated vehicle or may be two or more could use it to operate it .In its assembly many different types of fasteners are used of different sizes and shapeswhich are as follows

1-Labyrinth Seal

A bearing seal that adds no friction, because there is no seal contact between the revolving part and the stationary part. Contaminants can't easily enter the bearing because the baffles of the labyrinth seal deprive them of a straight route inward. Labyrinth seals work very well as long as the bearing assembly is not immersed. The illustration shows a standard hub, but similar seals are used on some other bearing applications as well.

2-Adjusting barrel

A hollow bolt, designed so that a gear or brake cable can run down through the center of it, but the housing stops inside the head of the barrel. This allows fine adjustment of cable tension without requiring the use of any tools. Adjusting barrels may be located at the end of any run of cable housing. On brakes, their primary function is to permit easy adjustment to take up the slack as the brake shoes wear down. On gear shifting cables, they help fine tune the indexing.

3- Cap Screw

A threaded fastener designed to screw into metal, with a head that is expected to stick up above the surface. Cap screws are commonly used on bicycles to secure bottle cages, luggage racks and other accessories. Cap screws are also used in many other locations on bicycles, but the nomenclature "cap screw" is rarely if ever used by practical mechanics. Most people call these "bolts" in practice, though sticklers may contend that is not proper usage.

4- Anchor bolt
An anchor bolt is used to attach objects or structures to concrete. There are many types of anchor bolts, consisting of designs that are mostly proprietary to the manufacturing companies. All consist of a threaded end, to which a nut and washer can be attached for the external load. Anchor bolts are extensively used on all types of projects, from standard buildings to dams and nuclear power plants. The simplest anchor bolt is a cast-in-place anchor. As seen in the figure, most designs consist of a standard bolt with a hexagonal head, which is cast in the wet concrete before it sets. There are other designs, some consisting of a bent bolt with a hook on the end, or some other sort of bending. Cast-in-place anchor bolts are the strongest type of fastener, but the casting is difficult, and they are usually only used for heavy machines mounted on poured concrete floors. Another use of this anchor bolt is to connect the concrete foundation of a building to its wall. With this, the building is more resistant to earthquakes. Currently there are several devices to assist in holding and in placing anchor bolt to set in the concrete. These devices mostly made from composite plastic. The new device, Bolt Snap, is more adaptable for many different sizes of anchor bolt diameters.

5 - Wedge anchors
Wedge anchors, also known as expansion bolts and expansion anchors, secure themselves using a mechanical wedging effect at the end of the fastener. As shown in the figure, tightening the bolt results in a wedge being driven up against a sleeve. This jams the end of the bolt, and provides the strength. Many different manufacturers provide a variation on this theme, usually depending on the condition of the concrete, and the type of load. If a mechanical anchor fails, it is usually in the form of pulling out a wedge of concrete, and for this reason, proper design looks at the depth of embedment, and assures that the bolts are not spaced too closely. In many parts of the world seismic anchors...
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