Year: 1886

page_text: Date of Application, 27th Apr., 1886.
Complete Left, 27th Jan., 1887.
Complete Accepted, 1st Mar., 1887.
I, NORMAN BROWN LOCKE of 369 Parliamentary Road in the City of Glasgow,
Locksmith, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in self locking bolts for doors especially half
or swing doors and under the invention the bolt is made in two parts or lengths
which meet and are connected together within a box or casing formed on or secured
to the back of a face plate screwed or otherwise fastened to the door, a tumbler or
trigger and a spring, the action of which is to retain or lock the bolt either in its shot
or drawn position, being also contained within the said box or casing. The tumbler
or trigger may be of various forms or shapes. In one convenient form it consists of a
lever centred at one end on a pin and having at its other end a raised part from which
a heel extends laterally towards one. side of the box or casing. The inner end of the
forward or upper part of the bolt that is to say the part which enters the frame or
lintel of the doorway has a jaw or recess, the under edge of which is straight and
checked or rabatted at each end the lateral heel on the tumbler entering one or other
of the checks accordingly as the bolt is shot or drawn. Into the jaw a projecting
piece formed on the side of the rearward or under half of the bolt enters, one edge of
the said projection being in contact with and riding over the curved raised part on
the tumbler.
The effect of this arrangement is that in shooting the holt the side projection on the
rearward or under half of it acting on the tumbler depresses the tumbler until the
lateral heel upon it passes out of the forward or upper check in the other half of the
bolt which is then shot out until the said heel comes opposite the rear or under check
into which it is forced by the spring acting on the under side of the tumbler the bolt
being thereby locked in its shot position. In withdrawing the bolt the reverse series
of movements takes place the bolt being locked in its drawn position by the spring
forcing the heel of the tumbler into the upper or forward check.
Under a modification the tumbler may be in the form of a 1 shaped or rocking
lever with an eye or hole at its centre and a lateral heel at each end. Through the
hole a pin fixed in the forward or upper half of the bolt passes into a race formed on
017

page_text: or secured to the inner side of the face plate the said race having two notches or
recesses one at each side into which the heels on the tumbler enter. The back or
under half of the bolt has a jaw embracing the vertical arm of the tumbler and in
shooting or withdrawing the bolt the said jaw so acts on the tumbler as to cause it to
turn through an are on the pin until the licel is free from the recess or notch in one
part of the race. The bolt then moves out or in until the other heel is by the action
of the spring forced into the opposite recess thereby locking the bolt in position.
The face plate carrying the improved bolt may be flat throughout but it has
preferably a recessed or box part in which the thumb or finger piece for shooting and
withdrawing the bolt is so situated as not to project beyond the plate the said piece
passing through a slot in the bottom of the recess.
CRUIKSHANK & FAIRWEATHER,
Glasgow, Agents.
I, NORMAN BROWN LOCKE of 369 Parliamentary Road, in the City of Glasgow,
Locksmith, 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 to improvements in self locking bolts for doors, especially
half or swing doors the improvements being illustrated under several modifications
and in detail of the parts to a larger scale by the several figures on the two sheets of
drawings hereto annexed.
Figure 1 sheet 1, is a front elevation of the parts of the improved bolt and of the
plate a by which it is carried and secured to the door the said figure shewing the bolt
withdrawn. Figure 2 is a like elevation shewing the bolt shot out, figure 3 is a
section at right angles to figures 1 and 2, and figures 4 to 11 inclusive are details of
the construction of various parts.
As shewn by these figures the bolt is composed of two parts or lengths b, c, which
meet and are connected together within a box or casing d, formed or secured on the
back of the face plate a, a tumbler or trigger e, and a spring the action of which
latter is to retain or lock the bolt either in its shot or drawn position. The tumbler or
trigger e, is illustrated in detail at figures 4 and 5, and it consists of a lever centred
at one end on a pin g, slightly forward of which a heel j, is made to act as an abut-
ment for the end of the spring, which is shewn in detail at figures 6 and 7. At its

page_text: other end the tumbler has a curved raised part 1, from the side of which another
heel i extends towards the face plate a. The inner end of the part b, of the bolt has
as shewn by figures 8 and 9, two stops or abutments k, k², the bottom of the jaw or
recess between which has one of its sides checked or rebatted as at 1, l, these checks
being to receive the lateral heel i, on the side of the tumbler which enters one or other
of them accordingly as the bolt is shot or drawn. The part c of the bolt which is
illustrated in detail at figures 10 and 11, has at one end a cross finger piece m which
projects through a slot made in the face plate a, whilst at its other end it has a
projecting piece situated in the jaw between the stops k, k, of the piece of the
bolt. The piece o is of lesser breadth than the remainder of the part c of the bolt and
as seen more particularly at figure 1. one side of it is in contact with and in operation
moves over the curved part of the trigger e.
The effect of this arrangement is that in starting to shoot or draw the bolt, the
piece o of the part e, first presses the tumbler or trigger e back against the action of
the spring, until the heel of the tumbler is free from the check or l¹ of the part
Τ
of the bolt, and accordingly as the bolt is being shot or drawn the end o' or o² of the
piece o, then acts against the heel or k, and pushes out or retracts the part b, against
the resistance of the spring, one end of which bears on the part b, the heel i of the
tumbler e being forced by the other end of the spring into the check or 1, locking
the bolt in position.
To afford access to the moving parts when required the box or case d, has as
indicated in dotted lines at figure 3, a removable lid or cover.
The face plate a with the arrangement just described has a recessed or box part 1,
in which the thumb or finger piece m, for shooting and withdrawing the bolt is so
situated as not to project beyond the flat part of the plate but as illustrated by
figures 12, 13 and 14 of the drawings the plate may be flat throughout, and the
thumb piece m for shooting and withdrawing the bolt may project through a slot made
in the box or casing d covering the moving parts.
With this arrangement the details of which are shewn by figures 15 to 20, the
thumb piece m besides passing through the slot in the box d also passes through a
slot made in the jaw or part between the heels k, k, on the portion of the bolt as
seen at figures 15 and 16, into a part e, figures 17 and 18, which in shooting or
drawing the bolt slides between k and k, the said part having two inclined
surfaces e c², which in operating act so as to unlock the bolt by moving back the
tumbler or trigger e, figures 19 and 20, until its heel is free from the check or
notch or in the bolt after which the end or e, acting on the heel k or k¹,
actuates the bolt itself.
Figures 21 to 20, sheet 2 of the drawings illustrate a modification of the last
described arrangement in which the thumb piece m for actuating the bolt instead of
passing through a slot in the face of the box or casing d, passes through the end of
the sail box and constitutes a continuation of the part c, which as seen has a slot c
made in it, into which a pin or stud fixed in the inner end of the part benters.
The slot is of sufficient length to enable the inclined surfaces c, c², of the part c, to
act on the part of the trigger or tumbler e, and release the heel of the tumbler
from the notch or check or, and so unlock the bolt before the part e begins to act
on the part b, to shoot or withdraw it.
Under a modification illustrated by figures 27 to 33 of the drawings, the tumbler
or trigger e may be in the form of an 1 shaped or rocking lever centred upon the
part of the bolt. The central arm of the lever enters a jaw e figure 30 made at the
inner end of the part e of the bolt and each of the other arms has a heel i projecting
from it laterally these entering a race s, made longitudinally in the casing or box d,
covering the moving parts and having at its centre a recess 83, and at its ends
recesses ¹,, into one or other of which one heel on the lever is forced by the action
of the spring, the other heel being forced into the recess s³, so as to lock the bolt in
its adjusted position. The spring is as seen at figures 29 and 33 forked, one part
bearing on the tumbler e and the other part on the bolt b.
In operating the bolt the part e acts so as to cause the tumbler e to move through

page_text: .
an are until one heel i is free from the recess and the other heel from the
recess s¹ or s².
With the arrangement last described the face plate a is of the construction set forth
with reference to figures 1, 2 and 3 of the drawings, that is to say, it has a recessed or
dished part p, through a slot in which the thumb piece m of the part e projects.
Figures 34 to 37, illustrate the adaptation of the same arrangement to a flat face
plate a, the thumb piece of the part c in this case being contained within the box or
casing d and actuated through a slot t made in the plate a or a slot may be made in
the side of the box or the piece e may be projected through the end of the box.
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.) The general arrangement and combination of parts constituting the self locking
bolt for doors, substantially as described with reference to figures 1 to 11 of the
appended drawings.
(2.) A self locking bolt for doors consisting of the part e, the part 6, the part e each
constructed as described and the spring, acting in combination substantially as set
forth with reference to figures 1 to 11 of the annexed drawings.
(3.) The general arrangement and combination of parts constituting the self locking
bolt for doors, substantially as described with reference to figures 12 to 20 of the
accompanying drawings.
(4.) In a self locking bolt for doors the combination of the parts b, c, and e, cach
constructed as described, and the spring f, substantially as set forth with reference to
figures 12 to 20 of the annexed drawings.
(5.) The general arrangement and combination of parts constituting the self locking
bolt for doors, substantially as described with reference to figures 21 to 26 inclusive
of the appended drawings.
cach
(6.) In a self locking bolt for doors the combination of the parts b, c, and C₁
constructed as described, and the spring, substantially as set forth with reference to
figures 21 to 26 of the accompanying drawings.
(7.) The general arrangements and combinations of parts constituting the self
locking bolt for doors, substantially as described with reference to figures 27 to 37 of
the appended drawings.
(8.) In a self locking bolt for doors the part b, the part e, the part e, each con-
structed as described and the spring, acting in combination, substantially as set forth
with reference to figures 27 to 37 of the appended drawings.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.