Improvements in Padlocks.
Year: 1899

page_text: Improvements in Padlocks.
I, JOSEPH LINCOLN CRANDALL, of 99, Stewart Street, Providence, Rhode
Island, U.S.A., Manufacturing Jeweller, do hereby declare the nature of this
invention to be as follows:-
This invention relates more especially to that class of padlock used as orna-
ments and for fastening bracelets and the like.
The invention has for its object the provision of a lock which can be quickly
manufactured.
A padlock constructed in accordance with this invention comprises a plate
stamped out to the shape of the lock and having a peripheral rim. A similar
plate fits within the rim aforementioned, and has sections of a rim forming up-
wardly projecting legs at its edges. This plate has the usual posts or pins for
carrying the spring and levers, projecting from its surface. An ornamental
outer plate rests upon the rim sections within the rim of the first mentioned plate
and is secured in place by said rim being bent over its edges.
DOL
1. 1000
P. R. J. WILLIS,
Agent for Applicant.
I, JOSEPH LINCOLN CRANDALL, of 99, Stewart Street, Providence, Rhode
Island, U.S.A., Manufacturing Jeweller, 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:-
This invention relates more especially to that class of padlock used as orna-
ments and for fastening bracelets and the like.
The padlocks usually used as pendants or charms on bracelets made of precious
metal or inferior metal plated with precious metal on the exposed surface have
heretofore been made up of a back plate having a marginal rim, to which the
hasp and locking spring were secured, and a front plate secured to the marginal
rim by solder. In this construction the heat used in soldering softens the metal,
particularly when light thin sheet metal is used, and produces a sightly, but weak,
padlock, liable to get out of order and lost by unlocking.
The object of this invention is to produce a substantial padlock without the
use of solder; and to this end the invention consists in the peculiar and novel
construction whereby a plate of inferior metal provided with marginal rim
CD 071

page_text: sections, and the posts forming the lock, is secured within the case by turning
the rim edge over the front plate, as will be more fully set forth hereinafter.
Figure 1 is a front view, and Fig. 2 a side view of the padlock. Fig. 3 is
a front view of the padlock as it appears before the front plate is secured, show-
ing the spring and hasp in locked position in solid lines and in the open position
in broken lines. Fig. 4 is a transverse sectional view of the padlock. Fig. 5
is a perspective view of the skeleton plate, and Fig. 6 is a plan view of the blank
for the skeleton plate.
In the drawings a indicates a front plate provided with a key-hole b; e the
hasp the marginal rim drawn up in suitable dies from the back plate e;
f a plate of inferior metal provided with the marginal rim sections fl, f¹ which
may be of the width shewn in Fig. 5, or of greater width, as indicated in broken
lines in Fig. 6, the rim section f2, and the section f³, and also provided with
the stop the post f, forming a pivotal support for the hasp c, and the key
post f. The plate f when drawn up and provided with the posts, as shewn
in Fig. 5, forms the substantial skeleton frame of the lock. When placed into
the part of the case formed by the back and rim d it closely fits the same.
The hasp c is now placed on the post f5, the margin d being provided with
is now
openings, through which the ends of the hasp extends. The spring
placed into the lock, so that the lower part of the same extends between the
rim section f and the rim of the case, one end of the spring g bearing on the
stop and engaging with the latch of the hasp c and the other end of the
spring bearing on the heel of the hasp. The front plate a is now placed within
the marginal rim d, bearing on the rim sections of the skeleton frame, and the
edges of the rim d are bent inward over the front plate. By the use of the
skeleton frame the edges of the rim d may be turned over by a die, and thereby
the case, with the front plate, may be secured to the skeleton frame.
A padlock constructed in this manner of sheet metal depends for its strength
on the rigidity of the skeleton, and as no part of the metal of the case is sub-
jected to heat the resiliency, polish and colour of the stamped metal are retained.
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: :-
(1) In a padlock, the combination with the plate e having the rim d, of the
skeleton plate f having a series of rim sections, and the front plate a secured
by the turned over edge of the rim as described.
the
(2) The skeleton plate f having the rim sections fl fl and f, and f³,
stop and posts fo and f adapted to support the hasp and locking spring of a
padlock and the case, substantially as described.
Tated this 10th day of December 1800