Improvements in Door Locks and Night Latches.
Year: 1892

page_text: Date of Application, 9th Feb., 1892
Complete Specification Left, 3rd Nov., 1892-Accepted, 7th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Door Locks and Night Latches.
I GEORGE WORRALL of 64 Newcomen Street Borough in the County of
Surrey Locksmith do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to construct a lock that will answer for either &
right or left handed plain or reverse bevel, with a square headed spring bolt so that
it may project further through the striking plate or box staple than heretofore
making it impossible or nearly so to push back such bolt from the outside with a
sharp instrument as is the case when a bevel headed bolt is used.
According to this invention I fit into the case of the lock a square headed spring
bolt in the usual way and such bolt is acted upon by a key or handle as usual and
in the case of night latches I suitably pivot a tail piece at the lower part of the
plate of case and near the back thereof such tail piece having a pin or projection
formed or fitted therein which takes into one end of the sliding plate such plate
being guided at the other end by a pin and slot in the usual way.
In order to adapt my invention to night latches so as to suit either a right or
left handed plain or reverse bevel I have a loose knob or handle which screws
into the spring bolt at either side as desired a hole being provided in both plates for
this purpose.
The striking plate or box staple I make with a suitable bevel so as to cause the
square head of the spring bult to be pushed back on striking such bevel.
Dated this 9th day of February 1892.
BROWNE & Co.,
9, Warwick Court, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Door Locks and Night Latches.
I GEORGE WORRALL of 64 Newcomen Street, Borough in the County of
Surrey Lock Smith, 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 :—
The object of this invention is to construct a lock that will answer for either a
right or left handed plain or reverse bevel with a square headed spring bolt so that
it may project further through the striking plate or box staple than heretofore
making it impossible or nearly so to push back such bolt from the outside with a
sharp instrument as is the case when a bevel headed bolt is used.
According to this invention I fit into the case of the lock a square headed spring
bolt in the usual way and such bolt is acted upon by a key or handle as usual and
in the case of night latches I suitably pivot a tail piece at the lower part of the
plate of case and near the back thereof such tail piece having a pin or projection
formed or fitted therein which takes into one end of the sliding plate such plate
being guided at the other end by a pin and slot in the usual way.
In order to adapt my invention to night latches so as to suit either a right or left
handed plain or reverse bevel I have a loose knob or handle which screws into
the spring bolt at either side as desired a hole being provided in both plates for
this purpose.
The striking plate or box staple I make with a suitable bevel so as to cause the
square head of the spring bolt to be pushed back on striking such bevel.

page_text: And in order that my said invention may be better understood I will now describe
the same with reference to the accompanying sheet of drawings in which :—
Fig. 1 shews view of a night latch constructed according to my said invention
with top plate removed.
Fig. 2 box staple to be used with same.
Fig. 3 striking plate to be used with same.
Fig. 5 section on A. B. (Fig. 2).
The same letters denote the same parts in all the views.
a. a. shews two tumblers but of course I may have any number, b. is a tail
piece pivotted at c. and having a pin d. thereon taking into the sliding plate d¹
held in position by the pin e. f. is the bolt having a square head as shewn
detached in plan at Fig. 4. g. is a spring for holding the tumblers a. a. in position.
The action is as follows: Upon inserting the key and turning it round the wards
will lift the tumblers a. a. and come against the tail piece b. and force it back
against the tail i. of bolt f. and thus unlocking the latch and when the door is
shut the square head of bolt f. will strike either the bevel h. on either the
box staple or striking plate (as the case may be) and thus force the bolt f. back
so as to allow it to enter the mortice or staple. The knob is screwed into
screw hole h. in tail piece of bolt f. In order to lock the latch I provide a bolt L.
which on pushing up prevents the bolt f. from going back by coming against the
tail i.
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 door locks and night latches the square headed bolt in combination with
bevel on box staple or striking plate substantially as set forth.
II. In night latches the tail piece b. in combination with tail i. substantially as
set forth.
III. Door locks and night latches constructed substantially as set forth.
Dated this 3rd day of November 1892.
November 1892.
BROWNE & Co.,
9, Warwick Court, W.C., Agents for Applicant.