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 TM 9-8000
demagnetized and remains stationary. The brake return
34-45. Operation. The armature assembly revolves with
springs release the brake bands from contact with the
the brakedrum and is kept in constant contact with the
brakedrums.
electromagnet by means of flat springs. When the brake
pedal is depressed, the current flows from the controller
The principle of the electric brake permits use of a self-
to the brake and through a coil of copper wire in the
adjusting feature to compensate for lining wear. As the
magnet, setting up a magnetic field and causing the
brake band wears, the electromagnet moves a little
magnet to attract the armature. The farther the foot pedal
farther to drive the brake lining against the surface of the
is depressed, the greater the amount of current is that
drum. An automatic stop on the brake band prevents the
reaches the magnet and the tighter the magnet clings to
rivets from coming into contact with the drum after
the armature. This attraction of the magnet to the
excessive wear, eliminating danger of scoring of the
armature causes the magnet, which can revolve within a
drum. If the vehicle Is standing still and the current is
limited arc, to start turning with the armature. As the
turned on, there is no action of the brakes. If the wheel
magnet turns, it engages a cam lever, which In turn
revolves in the slightest degree, however, the brake is
expands the brake band evenly against the brakedrum in
operated.
the conventional way.
When the current is cut off by removing pressure from
the brake pedal, the magnet in each brake Is
34-35/(34-46 blank)
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