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Electric Hoists Terms

Attachments – Components that are used along with lifting devices, forged, stamped or cast.

Boom (Crane) – The projecting part of a hoist, sometimes connected to a rotating structure. This is responsible for supporting the hoisting tackle and load.

Breaking Strength – The measured load that is required to break a chain or wire rope.

Carbon Chain – A type of chain commonly used for various pulling and towing purposes.

Clevis – 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.

Controller – A device used by the hoist operator to adjust the amount of power delivered to the unit’s electrical motor.

Critical Load – The load point at which any uncontrolled movement will result in hazardous safety conditions.

Critical Service – Using hoisting equipment for the handling of critical items.

Cushioned Start – A way of reducing the rate of acceleration when moving loads.

Drum – 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.

Festooning – A way of supplying power to a hoist that is moving along a beam.

Hook – A lifting attachment that is connected to a hoist.

Hook Load – 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.

Idler – A roller that is used to support and guide a rope or chain.

Lifters – Grabs that are designed to attach, hold, control and direct a load, commonly used with hoists.

Line Speed – 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.

Load Capacity – The maximum weight that a hoist is designed to safely carry. Under full loads a hoist’s maximum line speed is typically reduced.

Pawl – 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 The pawl ensures the one way travel of the ratchet, which adds safety in case the raising/lowering force is suddenly withdrawn.

Plate Clamps – Devices that are used with hoists to lift large, heavy steel plates.

Qualified Inspector – A professional or manufacturing representative who is certified to inspect a hoist or other type of rigging system.

Ratchet – A circular-shaped mechanism with uniform ridges. The ratchet allows for line retrieval of intake.

Reeving – The path of the wire rope on a hoist when it pays off the hoist drum and wraps around the upper and lower sheaves.

Rigging – Any necessary equipment or hardware used to attach a load to a hoist.

Running Sheave – A sheave that will rotate when the hook is raised and lowered.

Side Pull – The portion of the hoist’s pull that is acting horizontally when hoist lines are not acting vertically.

Sheave – The grooved wheel/pulley that uses a chain or a rope to change the direction and point of application of the pulling force.

Tag Line – A type of rope used to avoid load rotation.

Trolley – 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.

Winch – A lifting device, which consists of a horizontal cylinder on a wire rope or chain, wound by a crank.