A New or Improved Padlock.
Year: 1897

page_text: Date of Application, 8th Aug., 1897
Complete Specification Left, 29th Apr., 1898-Accepted, 16th July, 1898
A New or Improved Padlock.
I, JOIN HODGKINSON, Park View, Mold, Flintshire, Plumber, do hereby declare
the nature of this invention to be as follows:-
A padlock with four levers and springs. The said levers fitting closely in
four notches formed in catch of above named lock. The said levers to be all
raised to one level by means of a key (hereafter mentioned) before the catch will
slide out, thereby undoing the lock."
The key of the above named padlock is a small oval plate with four pins
attached to same, which is pressed by the thumb through four small holes on
outside plate of lock to manipulate levers.
No two keys need be made alike or locks.
I, JOHN HODGKINSON, Park View, Mold, Flintshire, Plumber, 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:-
A padlock with four levers and springs. The said levers fitting closely in
four notches formed in catch of above named lock. The said levers to be all
raised to one level by means of a key (hereafter mentioned) before the catch will
slide out, thereby undoing the lock.
The key of the above named padlock is a small plate with four pins
attached to same, which is pressed by the thumb through four small holes
on outside plate of lock to manipulate levers.
No two keys need be made alike, or locks.
Referring to the annexed drawings,
Figure 1 is an elevation of my lock shewing the apertures in the case for the
insertion of the key.
Figure 2 rear elevation of same with part of casing removed.
Figure 3 sectional view shewing controlling spring.
Figure 4 perspective view of key.
a is the bolt which is provided with notches in which the tumblers b engage.

page_text: These tumblers are pivotally carried at c and the ends d are controlled by
springs e for the purpose of causing the ends f to engage in the notches in the
bolt a.
The notches in the bolt a are of various depths, and it will be seen
that in order to release the tumblers from these notches the key shewn in per-
spective in Figure 4 must have projections so arranged as to bring the tumblers
to a position which will release them from the notches in the bolt. When the
projections upon the key, which are arranged so as to bring the tumblers to
the required position, are inserted through the apertures in the casing i of the
lock provided for this purpose the bolt a may be withdrawn sufficiently to allow
the bent part to be rotated, and so freeing the article locked, such as in the case
of a trunk. The notches may be so arranged that by forcing the bolt into its
locking position the tumblers will fall into the notches and so lock the bolt, this
locking action taking place after the end g of the bolt a has passed through
the aperture provided in the casing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I claim
is:-
1. In a padlock of the class herein described: the combined construction and
arrangement of the various parts substantially as set forth and illustrated herein.
2. A curved bolt or locking piece slidably carried in a casing; said bolt
having recesses in which tumblers engage; said tumblers being controlled by
suitable springs; a key having projections arranged to correspond with the depth
or distance which the tumblers engage in the notches in the bolt aforesaid;
apertures in the casing for the entrance of the projections on the key aforesaid
for the purpose of enabling the tumblers to be brought to a position to enable
the bolt to be withdrawn a sufficient distance from the casing so that it may be
rotated substantially as described and illustrated herein.
Doted this 90th day of Anal 180's