The structure and working principle of the lever binder


The structure and working principle of the lever binder

A lever binder, also known as a lever ratchet binder or lever chain tensioner, is a device commonly used for tightening and securing chains in various applications, such as in cargo transportation, construction, and agriculture. It's used to create tension in chains, ropes, or cables to secure loads safely. Here's an overview of its structure and working principle:


Handle/Lever: The lever binder has a long handle or lever that extends from the main body. This lever is used to apply force and tension to the chain or cable.

Main Body: The main body of the lever binder contains the mechanism responsible for transferring the force from the lever to the chain. It typically houses a ratcheting mechanism and other components.

Hooks/End Fittings: The lever binder has hooks or end fittings on each end. One end connects to the chain being tightened, while the other end attaches to an anchor point or a load. These hooks are designed to securely engage the chain links or attachments.

Ratchet Mechanism: The ratchet mechanism is inside the main body of the binder and plays a crucial role in maintaining tension in the chain after the lever is operated. It prevents the chain from loosening by allowing the lever to move in only one direction while preventing backward movement.

Working Principle:

Hook Attachment: One end of the lever binder is connected to the chain or cable that needs to be tensioned. The hook is engaged with a link of the chain, ensuring a secure connection.

Anchor Point: The other end of the lever binder is attached to an anchor point or a load that needs to be secured. This could be a vehicle, a structure, or another stable object.

Initial Tensioning: The lever binder is initially positioned so that the chain is slightly taut. The lever is then operated, either by pulling it upwards or downwards, depending on the design of the binder.

Applying Tension: As the lever is operated, the ratchet mechanism inside the main body engages, allowing the lever to move in one direction only. This causes the lever binder to pull the chain and create tension.

Ratcheting: Once the lever is pushed down or pulled up, the ratcheting mechanism locks in place, preventing the lever from moving backward. This maintains tension in the chain and prevents it from loosening due to vibrations, movement, or changes in the load.

Securing the Load: With the chain tensioned and secured, the lever binder holds the load firmly in place. The tension in the chain prevents the load from shifting or falling during transportation or other activities.

Releasing Tension: To release the tension and remove the lever binder, the ratchet mechanism is disengaged using a release lever or button. This allows the lever to move freely in the opposite direction, releasing the tension and allowing the hooks to be disengaged from the chain.

Lever binders are designed for heavy-duty applications and provide a simple and effective way to secure loads using chains or cables. However, it's important to use them according to the manufacturer's guidelines to ensure proper operation and safety.