Improvements in and relating to Self-locking Padlocks.
Year: 1890

page_text: Date of Application, 22nd July, 1890-Accepted, 20th Sept., 1890
COMPLETE SPECIFICATION.
Improvements in and relating to Self-locking Padlocks.
I CHRISTIAN ALBERT JENSEN of 77 Chancery Lane, in the County of London,
Patent Agent, do hereby declare, the nature of this invention (a communication to
me from abroad by Matthew D. Lagan, a citizen of the United States, residing at
No. 6 Common Street, in the City of New Orleans, County of Orleans and State of
Louisiana, one of the United States of America, Machinist,) and in what manner the
same is to be performed, to be particularly described and ascertained, in and by
the following statement :—
The invention relates to improvements in self-locking padlocks, opened by a pull of
the key, and its chief object is to increase the security of such locks.
In the accompanying drawings;
Figure 1, is a front elevation of the padlock, with shackle closed and face plate
removed.
Figure 2, is a front elevation, with face plate removed, shackle open and key ready
for withdrawal.
Figure 3, is an outline of the key, and
Figure 4, is an outline of the middle tumbler.
A, is the lock case, having a recess, a, in its outline, to receive the staple or link to
be locked. Inside the case are flanges, b, and c, which guide the key when inserted
or withdrawn. The flange, b, acts as a lower stop for the tumblers.
The flange, c,
supports the spring of the shackle. A third flange, d, serves as an upper stop for the
tumblers.
B, is the shackle having a toe, e. The shackle is pivoted on a stud, f. When
released by the pull of the key upon the tumblers, the shackle is thrown open by a
spiral spring, C, bearing upwards against the shoulder of the shackle and seated upon
the flange, c, between the walls, g.
There are three tumblers, pivoted upon the stud, h. To reduce friction a thin
washer may be placed between the upper and middle tumbler, and another between
the middle and lower tumbler.
Tho
The upper and lower tumblers, D, are identical and are interchangeable.
middle tumbler, E, has a special contour. A strap spring, i, is inserted in each of
the tumblers and bears against the rim of the case, for the purpose of returning the
tumblers to position after being operated by the key. Shoulders, m, formed upon the
tumblers, bear against the flange, d. Other shoulders, p, engage with the shackle
toe, e. Other shoulders, t, will bear against the flange, 6, when the tumblers have
been moved to their full extent to release the shackle.
G, is the key, having a slot, w, upper shoulders, y, and lower shoulders, z.
The shackle being locked, the key is inserted through the rim of the case, between
the flanges, b, and c, until stopped by the contact of its shoulders, z, with the case.
The handle of the key is then moved towards the right, thus engaging the slot, w,
with the shoulder, v, of the middle tumbler, and the shoulders, y, with the shoulder, t,
upon the upper and lower tumblers. A pull upon the key will then release the shackle
and key, and the strap springs will throw the tumblers back into position to engage
the toe of the shackle when it is pressed down.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is:
The combination in a padlock of a shackle, B, pivoted within the lock case and
having
casins of seeing looking tumblr D and E pivoted within the

page_text: lock case and arranged to engage the aforesaid shackle, and having, respectively,
the shoulders, p, m, t, v; and a key, G, arranged to engage said shoulders and having
a slot, w, and shoulders, z, the whole constructed and arranged substantially as herein
described, for the purpose of releasing the lock by a pull upon the key.
Dated this 22nd day of July 1890
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.