What is the mechanism of a scissor lift used for?

On modern systems, joystick lift controllers are often deployed to raise, lower, and move the platform. Most scissor lifts have an easy interface that enables the operator to perform height adjustment. Some scissor lift tables have pre-configured elevation heights. 

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As previously discussed, to raise or lower the platform, hydraulic fluid is forced into or out of the hydraulic cylinder(s) in a hydraulic scissor lift table mechanism. A check valve holds the hydraulic fluid in the cylinders, ensuring that the lift table remains at the selected raised position. Opening the down valve allows hydraulic fluid out of the cylinder at a controlled rate and lowers the lift table. An electric motor and hydraulic pump typically perform repetitive lifting and positioning, activated by the push of a button.  

In a pneumatic system, scissor lift tables can be connected to on-site compressed air systems, eliminating the need for hydraulics, motors, pumps, or electrical connections. Durable airbags provide consistent and smooth height adjustment and lifting. A relief valve prevents pressure build-up and acts as overload protection.

In some scissor lift configurations, the working platform of the unit can rotate to provide the operator with greater accessibility. In hydraulic units, table control is accomplished via an electric motor and hydraulic pump that perform repetitive lifting and positioning operations with the push of a button.

Knowing how to classify a Mobile Elevating Work Platform (MEWP) is part of the recent ANSI Standards updates and every operator&#;s responsibility.

MEWP classifications are made up of a combination of two key elements; TYPE and GROUP.

A MEWP Type is in reference to traveling. Traveling is defined as self propelled or manually propelled.

A MEWP Group is determined by where the platform location is in reference to the tipping line.

For training purposes, there are only two Groups and two Types to remember that make up 4 classifications of MEWPs, 1A, 1B, 3A and 3B.

Type 1 and Type 3

Type 1 - lifts only travel or move in the stowed position. These are manually propelled or push around lifts and tow-behind booms

Type 3 - are self-propelled lifts where travel is controlled from a point on the work platform

Group A and Group B

Group B = Boom Lifts (aerial lifts designed for the platform to be elevated beyond the tipping line)

Everything else is Group A

In other words, all boom lifts are in Group B and all MEWP&#;s that only lift vertically are in Group A.

Let&#;s talk about them one at a time.

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Type 1, Group A (1A)

Stationary vertical lifts

Traveling is allowed only with the MEWP in its stowed position. The platform never extends beyond the tipping line and the machine is designed to only be moved with the platform in the stowed position.

A great example of a (1A) MEWP would be manually propelled or push around vertical mast lifts.

Type 1, Group B (1B)

Stationary boom lifts

Traveling is allowed only with the MEWP in its stowed position. The platform is designed to extend beyond the tipping line and the machine is designed to only be moved with the platform in the stowed position.

Trailer-mounted Booms are perfect examples of a (1B) MEWP.

Type 3, Group A (3A)

Platform-controlled self-propelled vertical lifts

Traveling with the work platform in the elevated position is controlled from a point on the work platform. The main platform never extends beyond the tipping line and machine travel is controlled from the platform controls.

Examples of (3A) MEWP would be electric or rough terrain scissor lifts and self-propelled vertical mast lifts.

Type 3, Group B (3B)

Platform-controlled, self-propelled boom lifts

Traveling with the work platform in the elevated position is controlled from a point on the work platform. The platform is designed to extend beyond the tipping line and machine travel is controlled from the platform controls.

Examples of (3B) MEWPs are self propelled articulating and telescopic booms.

Type 2 MEWPs

Traveling with the work platform in the elevated position is controlled from a point on the chassis.

Note: because Type 2 MEWP&#;s are uncommon, they are not included in operator training.

Please note, this article is not designed to take the place of a comprehensive operator training program.

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