disk tumbler and side bar for the
next two mechanisms. This was
a tough lock to pick. However I
feel that the real thought behind
the mechanism’s design was key
control. Figure 9, shows the key.
Although possessing some of
the traits of a high security lock,
This lock is physically strong,
but can be easily opened by pick-
ing or pulling the plug out.
American did make a better
lock that solved some of the
problems encountered in earlier
locks, the model 747 was made in
the 1980’s, figure 11.
Even Slaymaker made an
attempt at a higher security
padlock. I am not sure of the date
or the model number of the lock,
but it too has many high security
traits and is physically strong.
The five pin tumbler mechanism
was made by Hurd for Slay-
maker, figure 12. It has the same
problems the early Hurd lock in
figure 6 had. It could be picked
and even shimmed.
To this point I have been
showing you some of the attempts American lock companies
have made to make their padlocks stronger. These attempts
never produced what might be
considered a true high security
lock with the exception of Eagle.
However these locks did not
reach production. It seems that
something was always missing. A
strong lock could be picked and
a lock with a good mechanism
11. Well armored, but still could
12. Slaymaker higher security
13. S&G re-branded Ingersoll.
9. Five star key.
10. An early attempt at higher