Page 53 - Electromechanical Devices and Components Illustrated Sourcebook

Chapter 2 Basic Mechanics 15

Toothed Belt through elastic deflection. There are many different springs
Drive Pulley designs that are intended to fulfill a variety of applications.
We are all familiar with the loud report of a screen door slam-
DC Motor
ming and with the long spring that is responsible for that
Nut
Piston Head action. The ordinary screen door spring is an excellent exam-
Guide Housing
ple of an extension spring.
Piston Tube
Figure 2-24 shows several of the more common spring
Threaded Shaft
designs that may be found in electromechanical devices.
Bushing
Base
Driven Pulley
Pneumatic Spring
Figure 2-23 Motorized Screw Thread Actuator

Coiled Flat Spring
extended or retracted. The speed of the piston can be con-
trolled by the speed of the motor and the ratio of the belt drive. Leaf Spring
Extension Spring
Springs Barrel Spring

Although springs are generally not considered simple Compression Spring
machines, they are a critical primary element in machine Torsion Spring
design. A spring is a mechanical device that can store energy Figure 2-24 Common Springs