Figure 2-6.-Pile switches.

commonly used in relays, key switches, and jacks in

Pile Switches

low-voltage signal circuits.

Pile switches are constructed so they open or close

one or more electrical circuits. The contacts are

Rotary Selector Switches

arranged in leaf, or pileup, fashion and maybe actuated

by a rotary, pushing, or sliding motion.

Rotary selector switches may perform the functions

The various basic forms of the contact arrange-

of a number of switches. As the knob or handle of a

ments in pile switches are shown in figure 2-6, view A.

rotary selector switch is rotated, it opens one circuit and

These basic forms are used by themselves or in combi-

closes another. In figure 2-7, the contact is from A to E.

nation to makeup the contact assembly of a pile switch.

If the switch is rotated clockwise, as viewed, the circuit

View B of figure 2-6 shows a contact assembly made

from A to E is opened and the circuit from A to D

by combining two break-make contact arrangements to

is completed. Some rotary switches have several layers

make form C. This switch is, therefore, designated 2C.

of pancakes or wafers. With additional wafers, the

When the armature is moved upward by the rotary

switch can operate as several switches. Oscilloscope

motion of the cam lobe (fig. 2-6, view B), two circuits

and voltmeter selector switches are typical examples of

are opened and two are closed. This type of switch is

Figure 2-6.-Pile switches.

2-4