Year: 1896

page_text: Date of Application, 21st July. 1896
Complete Specification Leff, 8th Oct., 1896-4ccented, 14th Nov., 1896
1, WILLIAM PERRY, of Lane Cove Road Willoughby near Sydney, in the Colony
of New South Wales, Gentleman, do hereby declare the nature of this invention to be
as follows:-
This invention has for its object an improvement in the construction of locks and
latches, more particularly those commercially known as rim locks, so as to prevent any
person so disposed to force the bolt back and thus open the door from the outside by
means of any fine instrument.
This improved lock or latch consists essentially first in the shape or construction of
the face plate second in the shape or construction of the box third of the peculiar
construction of the bolt.
In locks at present in use the face plate is at right angles to the door and the box
similarly placed, and when the bolt is shot so as to lock the door, the bevel end of the
bolt is only partly covered by the box it is possible for any person by passing an
auger or any other fine instrument through the stop affixed to the frame of the door
and the space between the door and frame to so work upon the bolt (on the bevel end)
as to force it back and thus open the door.
In this invention this is prevented and made impossible by constructing the face
plate of the lock at an outward angle from the door and the box to correspond.
The bolt must necessarily be made slightly longer than those at present in use so
that the bolt when shot may assume a position in which the plane side of the bolt
covers the aforesaid space between the door and the frame.
In the construction of some door frames it may be possible to pass an auger or
other fine instrument through so as to strike the bevel end of the bolt, in this improved
lock and so as to prevent the bolt being worked back I place a slot or groove in the
bevel end of the bolt, this will prevent any fine instrument working upon the full
bevel surface of the bolt as the point of the said instrument must necessarily catch in
the slot or groove. If necessary two or more slots or grooves can be made in the
bolt.
The invention may be applied to a simple spring latch as I do not desire to cover
any internal lock mechanism, my invention being confined to the construction of the
box and face plate of a lock and also to a bolt having a bevelled end in which a slot
or slots are cut.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: Improvements in Locks and Latches.
I, WILLIAM PERRY of Lane Cove Road Willoughby near Sydney in the Colony
of New South Wales, Gentleman, 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 has for its object an improvement in the construction of locks and
latches, more particularly those commercially known as rim locks, so as to prevent
any person so disposed to force the holt back and thus open the door from the outside
by means of any fine instrument.
This improved lock or latch consists essentially first in the shape or construction of
the face plate second in the shape or construction of the box third of the peculiar
construction of the bolt.
The invention may be more fully understood by reference to the accompanying
drawing in which :-
Figure 1 is a view of this improved lock affixed to the door.
Figure 2 is a longitudinal section of this improved lock.
Figures 3 and 4, are modifications of the bevel end of the bolt.
In all figures similar letters are used to denote similar parts. A is the lock secured
in any suitable manner to the door B.. C is the bolt used for fastening the door.
Dis the box secured to the frame work E of the door in any suitable manner. Fis
a slot or groove cut in the bevel or striking end of the bolt. G is the face plate of
the lock A. H is the striking plate of the box D.
I is the space between the door and the frame work, J is the stop affixed to the
frame work E. K is the rod by which the bolt C is operated being itself operated by
the handle L. M is a spiral spring through which the rod K passes and is used to
force the bolt C outwards.
In locks at present in use the face plate is at right angles to the door and the box
similarly placed, and when the bolt is shot so as to lock the door, the bevel end of the
holt is only partly covered by the box it is possible for any person by passing an auger
or any other fine instrument through the stop J and the space I to so work upon the
bolt (on the bevel end) as to force it back and thus open the door.
In this invention this is prevented and made impossible by constructing the face
plate of the lock at an outward angle from the door and the box to correspond.
The holt (must necessarily be made slightly longer than those at present in use so
that the bolt when shot inay assume a position as shewn in Figure 2.
In the construction of some door frames it may be possible to pass an auger or
other fine instrument through so as to strike the bevel end of the bolt C, in this
improved lock and so as to prevent the bolt being worked back I place a slot or
groove such as F in the bevel end of the bolt, this will prevent any fine instrument
working upon the full bevel surface of the bolt as the point of the said instrument
must necessarily catch in the slot or groove F. If necessary two or more slots or
grooves can be made in the bolt, such as is shewn in Figures 3 and 4.
In the drawing herewith is shewn a simple spring latch as I do not claim any
internal lock mechanism my invention being confined to the construction of the box
and face plate of a lock and also to a holt having a bevelled end in which a slot or
slots are cut.
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 :-
1st. In locks and latches the face plate constructed at an outward angle such as G

page_text: and a box so constructed that the striking plate will be parallel to the face plate ;
substantially as herein described, explained and illustrated in the drawings.
2nd. In locks or latches the bevelled end of the bolt being provided with one or
more grooves or slots substantially as herein described, explained and illustrated in
the drawings.
3rd. The combination and arrangement of the several parts all together forming
"an improved lock or latch" substantially as herein described, explained and
illustrated and for the purpose set forth.
Dated this 8th day of October 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.