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PART C Operating Mechanism working principle & maintenance
1.3 Operating mechanism - Working principle
There are two options for charging the springs
1. By electric motor.
2. Manual operation
1.3.1 Electrical Spring Charging (Ref Fig B)
Spring charging unit consists of Arm (1), Charging
gear (2), Closing Spring (3), latches (4), reduction
gear with Spring charging Motor and Cam (5).
Closing - Spring assembly & charging gear are
mounted
on
power shaft. When the
rotates, the reduction gear connected to that gives
1/144
reduction. Reduction gear assembly is
connected axially with the Cam that rotates the
spring-charging arm.
The arm rotates the charging gear, at the same
time; the latches hold the charging gear and arm
returns to its position. Closing spring gets stretched
2
6
1
2
3
and this continues
charged. The backward rotation of the charging
gear (2) is prevented by latches (4). A plastic cam
activates Motor-cut-off switch & Spring Charged
indication will appear after full charging. Closing
Motor
lever (6) stops the shaft from further rotation. Motor
cutoff switch disconnect the supply of the motor.
Fig. F (page 37) shows initial stage of closing spring
and associated lever (L1).
Fig. G (page 37) shows the condition after closing
spring gets fully charged. During this process latch
L1 rotates of about 180°.
4
5
Fig. B
1
till
the
spring gets fully
3
35
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