The true northerner. [volume] (Paw Paw, Mich.) 1855-1920, 1874-08-14

without regard to the thickness of the
door.
In general terms we may designate
the distinctive peculiarities of the Yale
lock as being the arrangement of the
parts acted upon by the key, and the
shape and size of the key itself, The
form of the lock and many details OF
construction of course vary with the in
tended use, and may not differ essentially
from those of other locks except in su
periority of design and more thoroughly
finished workmanship.
These prominent features may be illus
trated by the description of Yale NOR
tise night latch, an escutcheou of this
kind being applicable to almost any
style of mortise or rim lock flush locks
for drawers, desks, etc.-differing only
in having the body of the lock contain
the mechanism which is here enclosed in
seperate escutcheon.
The escutcheon consists of an exterior
shell of cylindrical form, containing in
its lower part smaller cylinder, from
which rises rib of metal containing the
"pin chambers and within which is
the "plug attached to the inner end of
which is the cam that imparts motion to
the bolt. This plug also contains the
key hole.
The escutcheon contains five holes, or
spin chambers, !" each formed partly in
the she'll and partly in the plug, there
fore a pit which filled one of these holes
would prevent the rotation of the plug,
but if the pin were cut in two, the joint
corresponding with that between the
plug and its hole, the plug could revolve
freely, carrying with it one half of the
pin, and leaving the other half in that
part of the pin chamber contained in the
she'll Such is precisely the construc.
ton of the lock and its great element of
security.
Each pin is in two parts, the upper
termed the driver the lower the pin, y
and above each driver is light spring,
tending to press drivers and pins down.
wards. In this position the drivers in
tersect the joint between the shell and
the plug, completely preventing the ro-
tation of the latter. If by the insertion
of knife blade, or other instrument in
the key hole, the pins are all raised as
high as they will 60, it will be found that
they bar the motion of the plug as effect.
ually as the drivers did, or if four of the
pins are elevated to their proper position,
the fifth will still prevent the revolution
of the plug.
To open the lock therefore, all the
pins must be raised simultaneously to
just the proper height, which can be done
only by the right key, since variation
of one.fftieth of an inch in the elevation
of either of the pins will prevent the
opening of the lodk. This explains the
immense variety of keys and wide range
approximations of which the Y ale lotk is
susceptible, surprising the capabilities
of any other lock now made
The width of the key admits of ten
different billings" or depth of notches,
therefore lock with but one pin could
be variously "set up" so as to be opened
by ten different keys. In lock with
two pins the number of changes, or va
ricties of keys, will be 100; three pins,
1000; four pins, 10000; five pins, 100
900; six pins, 100000; seven pins
100000. the least number of pins
contained in any one of the Yale locks
is four, as in drawer and desk locks;
the night lacthes have fve the post of
fee, heavy store door locks, etc, six; and
the " safe deposit locks inside
doors of safes, vaults, etc-have seven
pins.
The company manufacture larger
variety Of fine locks for all purposes
than have ever been offered to the trade
but the great diversity of styles pre-,
vents Particular description of all.
Charles r.. Smart eft al VS. School