The word "tal" comes from the Dutch nautical term talie. Currently, this word denotes one of the most popular types of material handling equipment. Such devices are widely used, because hoist cost is low, and the use everywhere when transporting various heavy objects, in loading and unloading. Being independent (stationary) devices, they are able to move objects only in the vertical direction, that is, up or down. In order to make it possible to move loads also in a horizontal direction, additional devices are required. Typically, a trolley and crane spans are used for this. In this case, the hoists are called not stationary, but mobile and are assembled together with the source of motion in a common body. They are also subdivided into rope and chain. Chain hoists are convenient to use in slewing and jib cranes, they are less voluminous and more often serve as additional devices. Ropeways are operated on monorails and overhead cranes for lifting objects of medium and high severity.
Hand hoists and electric hoists are distinguished, depending on the method of setting the devices in motion. Electric (they are also electric hoists) have an advantage in speed and in the maximum allowable weight of goods, but manual (they are mechanical) are simpler in design, take up less space and cost less. For conveyor, large-scale and high-speed work, it is better to use electric hoists, and for simple work, in the absence of electricity and in cramped circumstances, it is more convenient to use manual mechanisms. Electrical devices are powered by an electric motor, while manual devices are triggered by the operator's muscular effort. Mechanical hoists, in turn, are divided into worm and gear hoists - judging by how the transmission is organized in them. Worm gears are more accurate in operation, however, unlike gear ones, they are heavier and work less quickly. Lever hoists are a gear type. A characteristic feature of this subspecies is the fact that the worker applies his force to the lever, and not to the lifting element. Therefore, such a device can only be controlled by being in direct proximity to it.
When selecting the necessary equipment, one should analyze not only the necessary technical data, take into account not only the nature of future work to be carried out, but also the brand of the manufacturing plant. A recognized leader in this area on the Russian market is a company from Bulgaria, whose products have proven their reliability, ease of use and durability. In addition, the telphers produced by this company are light, compact and standing.
