According to the
dictionary, the device for lifting and raising heavy or cumbersome objects is
called as the hoist. It is the member of the crane family. There are many
different kinds of available in this category too. The most commonly used is
the Chain Hoist. Theycan be of either
the chain type or the wire rope type.
Common small
portable hoists are of two main types, the chain and the wire rope or cable type. They may have a lever to
actuate the hoist or have a loop of operating chain that one pulls through the
block which then activates the block to take up the main lifting chain.
A hand powered
chain hoist with a ratchet wheel is known as a "ratchet lever hoist" or,
colloquially,”Come-A-Long". Going back in the history, the original hoist
of this type was developed by Abraham Maasdam of Deep Creek, Colorado about
1919, and later commercialized by his son, Felber Maasdam, about 1946. It has
been copied by many manufacturers in recent decades. A similar heavy duty unit
with a combination chain and cable became available in 1935 that was used by
railroads, but lacked the success of the cable only type unit.
The following are
the features it offers:
·
Offered
as hook suspension or with a range of push,
·
Mains
contactors fitted as standard for increased safety
·
Complete
electrical protection by low voltage control circuit
·
Seated
protection from dust and water to IP55
·
Quiet
and smooth hoist operation ensured.
·
Top
hook fitted as standard
·
The
heavy-duty 960-rpm. Brake motor features with adjustable spring pressure
·
All
units factory tested to 125% safe working load
·
Three
phase 230-415V,50Hz units available
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