Improvements relating to Locks.
Year: 1897

page_text: Date of Application, 17th Sept., 1897-Accepted, 1st Jan.,
1898
Improvements relating to Locks.
I, JOHN GREEN, of the firm of John Green and Company, City Lock Works,
236 Bradford Street, in the City of Birmingham, Manufacturer, 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 consists of improvements relating to locks, my object being to
construct such appliances in a strong and durable form and to so arrange the same
as to permit of very ready and convenient inspection of the interior lock mechanism.
My invention comprises the employment with the lock case of a loose sliding
cover plate or plates which are secured by the lock mechanism. :
In order that my invention may be the more readily understood I append here-
unto two sheets of explanatory drawings to be hereinafter referred to.-
Figure 1 on sheet 1 is an elevation of a padlock constructed in accordance with
my invention, and Figure 2 a similar view of the lock with the front cover plate
removed.
Figure 3 is an elevation of the padlock with the front cover plate removed and
also showing the shackle withdrawn. Figure 4 is a separate view of the shackle
and the sliding lock plate to which it is pivotted.
Figure 5 is a sectional end view of the padlock.
Figure 6 is an elevation and Figure 7 a sectional end view representing a modified
construction of my improved lock case.
Figures 8 and 9 on Sheet 2 illustrate a modification in the construction of my
improved padlock.
The same reference letters in the different views indicate the same parts.
The case or body of the padlock illustrated at Figures 1, 2, 3, and 5 consists of
the rim plate A and the back plate A¹ cast or formed together from Brass or other
metal, the rim plate being provided with a groove as a for the reception of the
edges of the sliding front cover plate B: The shackle C is provided with a pair
of stems CC each of which are square or rectangular in section and are made
The stem C
a sliding fit between the front and back plates of the padlock case.
is pivotted to the sliding lock plate 1) and when such plate together with the
stems C and Care in the lock case they are secured by the specially formed lock-
ing bolt E which engages a projection d from the sliding lock plate D as shown
at Figure 2, and also a recess c in the stem C. The locking bolt E is operated
by means of the key of the ordinary lock mechanism arranged within the case.
When the bolt E is unlocked the shackle C together with the lock plate D to
which it is pivotted can be withdrawn to the position indicated at Figure 3, and
the shackle alone then turned on its pivot to the position indicated by the dotted
lines at Figure 1. After removing the small screw stud b (Figure 5) the front
cover plate B can then be completely withdrawn, fully exposing the lock
mechanism. The plate B is shown in its closed position at Figure 1 and also in
its partially withdrawn position by dotted lines, whilst at Figures 2 and 3 it is
completely withdrawn.
When the shackle stems and the sliding plate E are

page_text: locked in their closed position within the case, the sliding plate B is effectually
secured independently of the small screw b, which serves only to prevent accidental
detachment of the plate when the shackle stems and the sliding plate are unlocked
and withdrawn from the case. Thus the locking movement of the ordinary lock
key automatically secures the sliding 'plate.
I sometimes make a lock case from rolled metal and with both front and back
cover plates detachable. At Figures 6 and 7 F represents a portion of a rim
plate, which may be either of rolled or cast metal, having grooves f for the recep-
tion of the detachable cover plates G G¹.
In the padlock shown in the Figures 8 and 9 on Sheet 2 the square or rectangular
section shackle stems C3 C are shortened and the locking groove c, as in the stem C³
on sheet 1, is dispensed with.
The sliding lock plate. D₁ has a pair of projections d d which are engaged by
the locking bolt E¹. At Figure 8 the shackle is locked in position but at Figure 9
it is unlocked and withdrawn from the case; the front cover plate. is. removed from
each view.
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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. A lock with a sliding cover plate or plates permitting of very ready and con-
venient inspection of the interior mechanism, substantially as described.
2. In locks, the use of a sliding cover plate with means whereby such" plate is
automatically secured within the lock case or body by the locking movement' of
the key, substantially as described.
3. The combination with a padlock of a shackle having stems to slide within the
lock case or body one of such stems being pivotted to a sliding lock plate, sub-
stantially as and for the purposes described."
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4. The arrangement and combination of parts forming the improvements in locks,
substantially as and for the purposes described and as illustrated...
7 } .'
MARKS & CLERK,
18 Southampton Buildings, London, W.C., 'and'
13 Temple Street, Birmingham; Agents for the Applicant.