Electric and Magnetic Locks

Recent lock developments include the magnetic-key lock, in which the pins are actuated by small
magnets on the key, which has no serrations. When the key is inserted into the lock, these
magnets repel magnetized spring-loaded pins, raising them in the same way that the serrations
on a tumbler-type key would. The card-key lock is actuated by a series of magnetic charges; the
card-key is popular where security is vital, because a new series may be electronically defined
for each new user, without having to change the lock itself. Similarly, electronic card access
systems are used in many hotels and office buildings. A special "key" system uses a paperboard
or plastic card, on which a code is recorded as a series of holes or bumps, or a microchip or a
magnetic strip on which a code is stored. A card reader at the lock location reads the code and
sends the information to a computer, which sends a signal to release the bolt if the code is
correct.  Electronic combination locks similarly use a computer to compare a combination stored
in memory with one entered on a keypad; access is permitted if the combinations match. In a
biometric entry system the numeric keypad is replaced by a scanner, which captures an
individual's fingerprint, palmprint, signature, or other personal characteristic and compares it with
that in the computer's memory. Biometric entry systems are most often used in high-security
areas, such as nuclear power plants.
In an electromagnetic lock a metal plate is attached to the door and an electromagnet is attached
to the doorframe opposite the plate. When the current flows, the electromagnet attracts the plate,
holding the door closed, When the flow of current is stopped, the door unlocks. A variation
places the plate and electromagnet so that the door is held open when current flows, enabling
the door to be closed automatically when the current stops.
Keyless entry systems, which are common in motor vehicles, rely on a keychain fob that contains
a remote-control unit consisting of an integrated circuit and a radio transmitter. The fob sends a
low-powered radio signal to a receiver in the motor vehicle, and, if the received code is the
correct one, the receiver in the vehicle relays the signal to a microprocessor, which opens the
lock. The acceptance of such entry systems has led to devices that allow additional functions
within the vehicle to be activated remotely.
Elie's lock & key
Since 1969
Call Us
for
Quick & Reliable Service
818-882-2525
Residential
Mobile Services
Commercial
Automotive
  • Chatsworth
  • Northridge
  • Porter Ranch
  • Granada Hills
  • Canoga Park
  • Mission Hills
  • Woodland Hills
  • North Hollywood
  • Van Nuys
  • Studio City
  • Sherman Oaks
  • Simi Valley
  • Winnetka
  • Encino
  • Pacoima
  • Calabasas
10180 Mason Ave. Chatsworth Ca 91311                                     Tell: 818-882-2525                                                     Lic# LCO4209