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LOCK INDUSTRY
ALIGARH is a city in the State of Uttar Pradesh
in central India , which is famous for its LOCK manufacturing
cluster.
Securing ones possessions' has long been
a concern of people throughout the world. Beyond hiding the
objects or constantly guarding them the most frequently used
option is to secure them with a device. Early solutions included
knots to either detect, like the Thief knot, or hamper, like
the Gordian knot.
The first known LOCK with a key was a pin
lock where a cylinder of wood with a hole drilled through
its axis was the key. The length of the cylinder was the critical
factor. It was strung on a rope hanging out of a hole in a
door. Then the key was inserted into the hole and the rope
pulled to push the cylinder to push the bolt the correct distance.
To lock the door just pull on the rope to extract the key
cylinder and simultaneously pulling the bolt closed. This
type of lock is still in use in certain parts of the world.
A danger of this lock was a vandal could push the rope into
the hole; an ancient equivalent of putting glue into a lock.
Early improvements in pin locks included
increasing the number of pins to increase security, and changing
the orientation of the pins to allow the key to provide the
unlocking force instead of a rope. Thus establishing the principles
of the modern Pin tumbler lock.
Next was developed a warded lock that is
still used in modern times when the security required is not
high and cost is a significant factor. It is the first lock
design to have a key recognizable to a modern person.
Lock puzzles were used to obscure the locking
mechanism or even provide a nonfunctioning lock for the thief
to waste time on.
Padlock
Cylinder lock
Combination lock
Disc tumbler lock
Electronic lock
Magnetic lock
Electric strike
Lever tumbler lock
Chubb detector lock
Pin tumbler lock
Tubular pin tumbler lock
Warded lock
5 Lever Lock
Bicycle lock
Child safety lock
A modern padlock
A padlock is a simple type of detachable
lock, with a hinged or sliding shackle designed to pass through
a ring or staple on a door, chest, etc. While some modern
padlocks do not require a key to be closed, others do require
it, most often as a security measure against leaving the key
inside the location being locked.
In Victorian times, English locksmiths made
giant padlocks which they challenged all-comers to open (or
"pick") in order to claim a prize. This was supposed
to demonstrate how secure their devices were to the public.
The type of padlock made from layers of laminated steel was
invented by Harry Soref in 1919.
Combination padlocks do not use keys.
Instead, the lock opens when its wheels are lined up correctly
to display the correct combination. Often the lock is re-programmable
by holding the shackle in a special position while turning
the wheels, allowing the number to be changed if necessary.
It should be noted that - with patience -
every mechanical combination padlock can be cracked without
any special skill, unlike the key version.
Padlocks have a wide variety of uses.
In some schools, workplaces, etc. they may be used to keep
lockers secure. Very small padlocks can be attached to suitcases
when travelling, to prevent casual thieves (and, possibly,
airport staff and baggage handlers) from opening the case.
Padlocks are also used as part of the security measures on
commercial and industrial sites, particularly for outdoor
areas.
In the late 17th century Christopher
Polhem started a factory in Stjärnsund that among other
things produced a padlock of his own invention, the Scandinavian
padlock ("Polhem locks").
Harry Soref Soref founded the Master Lock
Company in 1921 and patented an improved padlock. In April
1924, he received a patent (U.S #1,490,987) for his new lock
casing. Soref made a padlock that was both strong and cheap
using a case constructed out of layers of metal, like the
doors of a bank vault. He designed his padlock using laminated
steel.
ALIGARH is a city in the State of Uttar
Pradesh in central India , which is famous for its LOCK manufacturing
cluster.
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