Electric Hoists Types and Terms
Types of Electric Hoists
-
are supplemental hoists that are used to handle light loads at a higher
speed than the main hoist.
-
are lifting units specially designed to raise and lower boats. Boat
hoists are typically hydraulically or electrically powered and can lift
up to 20,000 pounds.
-
use roller or link chains as a lifting medium. Chain hoists are typically
electrically powered, but can be manually and pneumatically operated
as well.
-
are lifting units designed to allow engine removal from automobiles,
airplanes or boats. Engine hoists are typically hydraulically powered,
but sometimes use an electrical motor.
-
are exclusively used to lift the water controlling gates at dams.
- are devices used to lift heavy loads.
-
have an integral drum, motor and gearbox, with no visible shaft couplings
between them.
- are attached to wall columns or ceilings.
-
are hoists suspended from a trolley. These hoists can be built into
the trolley or connected to the trolley using a clevis or hook.
- pulls heavy loads horizontally.
-
use wire rope as a raising/lowering medium. A complete wire rope hoist
consists of a rope storage drum, one or more motors, a gear box and
a braking system; they can be mounted in a stationary position or along
a monorail attached to a trolley that allows them to slide to different
locations.
Electric Hoists Terms
-
Components that are used along with lifting devices, forged, stamped or
cast.
- The projecting
part of a hoist, sometimes connected to a rotating structure. This is
responsible for supporting the hoisting tackle and load.
- The measured
load that is required to break a chain or wire rope.
- A type of chain
commonly used for various pulling and towing purposes.
- A U-shaped fitting
that has a pin or a number of pins. A shackle clevis is a device used
to safely lift a load.
- A device used by
the hoist operator to adjust the amount of power delivered to the unit's
electrical motor.
- The load point
at which any uncontrolled movement will result in hazardous safety conditions.
- Using hoisting
equipment for the handling of critical items.
- A way of reducing
the rate of acceleration when moving loads.
- A cylindrically-shaped
barrel with a uniform diameter that can be found in grooved or smooth
configurations.
Wire
rope or chain is wound around the drum for operation and storage.
- A way of supplying
power to a hoist that is moving along a beam.
- A lifting attachment
that is connected to a hoist.
- The total weight
that is supported by the hook of a hoist. This includes the load, wire
or rope tackle and any other masses suspended from the hook.
- A roller that is used
to support and guide a rope or chain.
- Grabs that are designed
to attach, hold, control and direct a load, commonly used with hoists.
- A measure of the
quickness of a hoist to wind up or let out its lifting/lowering medium.
Line speed is typically measured by the manufacturer without a load attached
to the hoist.
- The maximum
weight that a hoist is designed to safely carry. Under full loads a hoist's
maximum line speed is typically reduced.
- The device that acts
directly upon the ratchet. The pawl ensures the one way travel of the
ratchet, which adds safety in case the raising/lowering force is suddenly
withdrawn.
- Devices that
are used with hoists to lift large, heavy steel plates.
- A professional
or manufacturing representative who is certified to inspect a hoist or
other type of rigging system.
- A circular-shaped
mechanism with uniform ridges. The ratchet allows for line retrieval of
intake.
- The path of the wire
rope on a hoist when it pays off the hoist drum and wraps around the upper
and lower sheaves.
- Any necessary equipment
or hardware used to attach a load to a hoist.
- A sheave that
will rotate when the hook is raised and lowered.
- The portion of the
hoist's pull that is acting horizontally when hoist lines are not
acting vertically.
- The grooved wheel/pulley
that uses a chain or a rope to change the direction and point of application
of the pulling force.
- A type of rope used
to avoid load rotation.
- A wheeled mechanism
supported by a frame from which the hoist is suspended. The trolley allows
for movement of the hoist for transporting supported loads.
- A lifting device, which
consists of a horizontal cylinder on a wire rope or chain, wound by a
crank.