What is the lever jack?
The term lever The jack can be applied to any small portable lifting device that relies on manual operation to lift or reduce heavy loads. The smooths of the levers fall into two main categories: jacks of cables or ropes and chain jacks. Both variants rely on Rohatka and latch system to turn the gears or pulley to a predetermined distance that raises the load. The roach and lever mechanism is equipped with a hook or fastening element that is used to suspend the lever of the lever from suitable support. Both types of lever jacks can be used in any orientation for lifting, tensioning or pulling operations, although the chain type is generally more suitable for vertical lifting. Picking up the rope, or "comes-long", as it is colloquially known, uses a steel rope wound on the pulley, which includes a built-in hornet system and an assembly hook. The other end of the rope is an equipped hook block used to connect the load.
Once the rope jack is securely attached to appropriate support using the mounting hook, the horned is unlocked and the rope pulls down to the load. The load is then connected to the hook block and the latch was reinforced. The load can then be raised by the handle up and down. Usually, the cycle of this clicks turns the pulley and loads the length of the rope again. The ascending lift usually does not turn the pulley and is only used to make the handle back to the top of the road to perform another cycle.
picking up the chain lever works in a similar way, except that there is no pulley system. Instead, it employs equipment over which the free length of the chain travels. The operating lever of the chain jack is also equipped with a latch system and can use other gears that increase the speed and strength of the jack. Every time the handle is cycled, the device that progresses or loads to increase or reduce the load. MechanThe nism of the chain handle is equipped with a release function, which means that, as in the case of a rope stroke, work is achieved in one half of the tension cycle.
The advantage of using the rope stroke is the fact that there is no free falling length of the chain, which makes it ideal for horizontal tensile operations. Although the chain jack may also be used in these applications, the excess string on the side without load is impractical, so it is more suitable for vertical lifting operations. One of the security considerations that should always be in mind when using either lifting the lever is never exceeding the stroke evaluation. Raising the lever can be particularly susceptible to overload disorders, while the rope lifting is particularly dangerous due to the possibility of whip injury if the rope breaks.