Marco SRS Air Bag Suspension

Pushbutton Safety Belt

Sliding door operator - Disposable Pelvic Examination Pack - Disposable Ear Speculum

Uses

Sliding door operators are typically used on the outside doors of large retail businesses. (smaller retail businesses prefer swing door operators.) They are also used in elevators (lifts)

Triggering

A door operator may be triggered in various ways:

Approach Sensor (such as a radar sensor) - the door opens when a user approaches it.

Pushbutton - the door opens when a user presses a button.

Access control - the door opens when the an Access Control System determines the user is authorized to go through.

Automatically (in the case of elevators)

A trigger from any of the above requests that the door be opened (or reopened if it was closing).

Safety sensors

A sliding door operator reopens the door if it closes into an obstacle. However, most operators use sensors to prevent the door from ever coming into contact with a user in the first place.

The simplest sensor is a light beam across the opening. An obstacle in the path of the closing door breaks the beam, indicating its presence. Infrared and radar safety sensors are also commonly used.

Technology

The operator is placed in the space above the sliding door.

A motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.

Historically, elevator doors were opened by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.

External links

Operator manufacturers:

Nabco Entrances Incorporated

MGO - Best Entrance Solutions

Tronco

Besam

DITEC

Dorma

Horton Automatics

K/M

STL Slider

LCN

Key Automation

Safety:

Overview of ANSI standards

Categories: Electro mechanical engineering | Automation | DoorsHidden categories: Articles lacking sources from December 2007 | All articles lacking sources

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