Pin joints are cylinder-shaped devices used to connect objects, allowing rotation at the connection point. They can be solid welded or free-moving, and are used in bridges, construction machines, and even car wheels. Pin joints have been used for centuries to create strong connections between objects.
In mechanical engineering, there are several methods of fastening objects together. A pin joint is a solid, bolt-like, cylinder-shaped device used to connect objects in the joint area. This type of joint connection allows each object to rotate at the common connection point.
Most mechanical devices that require folding or unfolding typically use a pin joint. These joints can be solid welded or allow movement between the two connected objects. A door hinge is a simple example of a free-moving pin joint. The hinge has a pivot that allows the door to connect and open freely in the door wedge. In this design, the pin is the only device that holds the door hinge from jamming the door.
A steel frame truss bridge is an example of a solid welded pin joint. These bridges have steel girders with multiple corners connected to each other with solid pins. These studs allow for the connection of severe angles within deck support systems. Solid studs are typically bolted together in the joint area and tightly welded. This adds strength and prevents the joints from collapsing under stress.
A pin wrench is another example of a pin joint. This is a small cylinder-shaped device that is typically inserted into a hole to prevent movement. The spanner wrench is used with a special nut and bolt that contains a hole for the wrench. This is the safety device that secures the wheels of a car to an axle. Since the cotter pin key is a pin that is inserted between the bolt and nut, it prevents a nut from coming loose over time.
Large construction machines use pin joints. Heavy loaders, cranes and backhoes all use pins to connect machine sections at the joint area. With a backhoe, the joint is used between the boom and the bucket link. This pivot design allows the bucket to move independently of the boom. The movable joint area allows the bucket to bend freely.
The pin joint design has been used for centuries to make connections between objects. With the construction of houses, bridges and bridges, beams are connected to columns, creating a strong grid that will keep a building stable. This design is used to create multiple levels of a house. The joint area of each beam is securely pinned to create a stronger foundation.
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