Year: 1886

page_text: Date of Application, 12th Aug., 1886.
Complete Left, 2nd May, 1887.
Complete Accepted, 3rd June, 1887.
THOMAS CARPENTER DOWD, North Street, Wednesfield, in the County of Stafford,
Lock Manufacturer, do hereby declare the nature of this invention to be as follows:―
An arrangement by which is inserted in any kind of Lock or Latch,-independent
of the drill pin-an extra pin, which can be defined as a blocking stump.
The blocking stump acts in conjunction with a specially made Key: i.e. a Key
that has fixed to the Lateral part of its bit a stump or protuberance.
This protuberance is equally applicable to pin & pipe Keys.
The object of this protuberance is to extend the bolt beyond the blocking-stump.
The name
blocking stump" is employed to describe the extra pin alluded to. The
reason of which is, because it positively prevents any kind of Key except the one
described above, from unlocking the lock, or withdrawing the bolt.
The drill pin, is the one, upon which the pipe of the Key is situated, when it is put
in the Lock.
Two other extra additions are also made in the Lock :-1st An extention underneath
the bolt, by which means the Locks may be made to differ. 2nd A bridge fixed over
the Levers at the back of the Lock, instead of at the front.
13
Al
1
1
CA
1.000

page_text: Improvements in Locks and Keys.
THOMAS CARPENTER DOWD Lock Manufacturer North Street Wednesfield in the
County of Stafford, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by the
following statement :—
.
An arrangement of providing and fixing in any kind or variety of Spring Locks or
Latches in close proximity to the drill pin (see A in Drawing). An extra pin defined.
as a blocking-stump (see B in drawing) which absolutely prevents any kind of key
from turning completely round and entirely incapacitates all general keys from opening
the Lock, with the exception of a specially made key which acts in conjunction with
the blocking-stump.
The specially made key has fixed to the Lateral part of its bit a stump or protuber-
ance (see C in drawing detached from Lock for the purpose of illustrating it more
distinctly). This stump or protuberance entirely obviates the difficulty and otherwise
impossibility of undoing the Lock.
The blocking-stump does not interfere nor impede the progress of the above
described key-bit until the stump or protuberance of the key-bit has extended beyond
the blocking-stump, and reached and removed the bolt, thus effectively facilitating the
necessary action and accomplishing the opening of the Lock.
A Bridge is also fixed over bolt & Levers at front part of Lock instead of at the
back as usual (see D in Drawing). This bridge holds the bolt and Levers in their
proper positions. Lastly as a preventative against Lockpickers and Burglars a Guard
is fixed to the Bridge (see E. in Drawing) which positively prevents any kind of
instrument from pushing back the bolt.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1st. The extra-pin called a Blocking-stump (see B in drawing).
2nd. The special Key that acts in conjunction with the Blocking-stump (see (.
detached for illustration in drawing).
3rd. The stump or protuberance on bit of Key, which is equally applicable to pipe
or pin Keys.
4th. The Bridge fixed over bolt and levers at front part of Lock (see D in
drawing).
5th. The Guard fixed to Bridge (see E in drawing).
6th. The Complete Lock and Key in combination with all the arrangement
described.
Dated this 30th day of April 1887.
THOMAS CARPENTER DOWD.