Progressive safety gear SG
Manual
SG braking downwards
Description and function
www.slc-liftco.com
Doc. 300.000.123 I Version 02.2019
Page 10
5. Specification and function
5.1 Specification of the safety gear
safety gear roller
roller guide
lever
brake shoe
rail
disk spring
distance plates
safety plate
internal housing
fishplate
5.2 Function of the safety gear
Upon tripping the overspeed governor both levers
synchronised by the actuating shaft are turned
by 15°.
In doing so the safety gear roller
moved by the lever makes contact with the rail surface.
The safety gear roller is pressed into the wedge-shaped gap between rail and roller guide
. Owing
to the wedge effect of the roller guide the full floating beared safety gear is moved until the brake
shoe
rests against the rail
.
The disc spring transmits the braking force to the internal housing. To adapt to different widths of
guide blades distance plates of various thickness
are placed under the disc.
The spring pressure is preset and secured by a safety plate
and a led-sealing to prevent
unauthorized adjustment.
In the braking process the brake shoe fixed on the bracket cuts into the rail surface. The braking
effect is caused by metal cutting in the rail surface, friction and spring tensioning work.
Moving the lift car upwards releases the brakes and lever and the safety gear rollers return to neutral
position.
The safety gear is ready for action again.
IMPORTANT
The safety gear transmits the braking force to the car. This braking force must be taken into account
in the construction of the interface between safety gear and car.
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