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This arrangement, which is applicable to many mechanical devices, senses the need for assistance and, thereafter, provides that assistance by way of the same mechanism.
English (United States)
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Assisting Force Amplifier
This arrangement, which is applicable to many mechanical devices, senses
the need for assistance and, thereafter, provides that assistance by way of the
The example shows a keyboard situation. An actual case requires 12 ounces
of force on a key to operate the mechanical linkage and accomplish the job.
A sensor causes the actuator to help operate the mechanism, but is
automatically locked out on the reverse stroke.
A key 1 is depressed by the operator. A bail 2 moves with key depression,
and also controls additional high force requirements. An added solid link 3
connects the bail 2 and a solenoid plunger 4. The solenoid plunger extension
provides a threaded rod 6 for positioning a program cam 7 using lock nuts 8. A
program-sensing switch 9 is actuated by a roller 10 following a cam surface
profile, actuating solenoid 5 when assistance is required.
With the system at rest, the switch 9 is held in a normally open position.
Slight depression of any key allows the roller 10 to move from the high spot and
close the switch 9 to energize the solenoid 5 through circuit wires 12. The
solenoid now takes over and exerts the required force to operate the mechanism
through the linkage 3 and the bail 2. Near completion of the stroke, the roller 10
rides up on the high part of a program cam, thereby cutting off power to the
solenoid 5 and allowing the spring 13 to return it to its rest position.