BAOT Hot Sale Manual Chain Lever Block 1T 2T VE Type Lever Hoist
What is a Chain Lever Block?
A chain lever block is a portable manual lifting device that utilizes a combination of chain drives and lever mechanisms to lift or move loads ranging from a few hundred kilograms to several tons.
Unlike electric hoists that rely on motors, it operates entirely through human effort, leveraging mechanical advantage to multiply the force applied by the user. Its core structure includes a durable outer frame, a load chain, a lever handle, a gear system, a braking mechanism, and hooks (top and bottom) for secure attachment to fixed points and loads. The compact size and lightweight design allow for easy transportation and operation in tight spaces, such as narrow construction sites or elevated work platforms.
Core Components and Working Principle
To understand how a chain lever block functions, it is essential to break down its key components and their interactions:
- Load Chain: Typically made of high-strength alloy steel, the load chain is engineered to withstand heavy loads without deformation. It features interlocking links that ensure smooth movement and reliable load-bearing.
- Lever Handle: The user-operated lever serves as the input mechanism. By pumping the lever up and down, the user initiates the gear system’s movement. The length and design of the lever are optimized to reduce the effort required, even for heavy loads.
- Gear System: Comprising a series of spur gears or planetary gears, this system amplifies the force applied to the lever. The gear ratio—often ranging from 40:1 to 100:1—determines the mechanical advantage: a higher ratio means less effort is needed to lift heavier loads, though the lifting speed may decrease.
- Braking Mechanism: A critical safety feature, the brake (usually a ratchet and pawl mechanism) automatically engages when the lever is released, preventing the load from slipping or falling. It ensures that the load remains securely positioned even if the user stops operating the lever.
- Hooks: The top hook (for attaching to a fixed support, such as a beam or crane) and bottom hook (for connecting to the load) are forged from high-strength steel and feature a safety latch to prevent accidental disengagement.
Chain lever hoist working principle is straightforward: when the user pushes or pulls the lever, the gear system converts the small force applied into a large lifting force.
The load chain is pulled through the hoist body, lifting the load incrementally with each lever stroke. To lower the load, the user typically engages a release mechanism (often a small lever or button) that disengages the brake slightly, allowing the chain to descend in a controlled manner.
In the realm of material handling and lifting equipment, the chain lever block—also known as a lever hoist or manual chain lever hoist—stands out as a compact, versatile, and indispensable tool.
Designed for lifting, pulling, tensioning, and positioning heavy loads in environments where power sources may be limited or inaccessible, this manual device combines mechanical efficiency with user-friendly operation, making it a staple in construction sites, workshops, warehouses, and industrial settings worldwide.
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