An Improved Bolt for Lavatory and other Doors.
Year: 1891

page_text: Date of Application, 6th Apr., 1891
Complete Specification Left, 4th Jan., 1892-Accepted, 6th Apr., 1892
PROVISIONAL SPECIFICATION.
An Improved Bolt for Lavatory and other Doors.
We, WILLIAM MAW TROUSDALE, of Kingslyn, Harrogate, in the County of
Yorkshire, Engineer, and JOSEPH LOWES THOMPSON, of 15 Thornhill Terrace,
Sunderland, in the County of Durham, Ship Builder, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to an improved bolt for lavatory and other doors and is
screwed on the inside of the door, the section of the bolt being cylindrical the end
of which is set off from the back-plate to allow for a working joint having a conical
corner on the neck which a pivoted drop-piece works on and having a collar fixed
on it to prevent it coming off. The drop-piece hangs in the vertical position by its
own weight. There is on the boss of the drop-piece at right angles to the knob an
arm which acts as a locking piece conjointly with the back-plate which has two
elongated slot holes one to lock the bolt when shot into the staple the other to
prevent it being shaken out of its position when not in use the door being recessed
to allow the arm to work freely in it.
There is fixed on the inside architrave of the door frame a bolt staple
covering a lever which works clear of the face of the architrave and is made large
enough to allow for a revolving movement being shaped to suit the bolt and
elongated so as to admit the bolt if in course of time the door should sag. When
the door is closed the bolt comes in a straight line with the edge of a lever
connected to an indicator or otherwise and above the centre so that when the drop-
piece is lifted the bolt may be shot into the staple. The drop-piece of the bolt
when released by the hand will revolve downwards and the arm on the boss of the
drop-piece will revolve upwards and lock itself in the elongated slot hole on the
back-plate by its own weight thus fastening itself so that it cannot be opened from
the outside. The bolt may be easily withdrawn by lifting the pivoted drop-piece
and drawing into the former position.
The aforesaid bolt may be used in conjunction with or without an indicator.
We do not bind ourselves to any particular shape as the bolt may be varied to
suit any position or purpose.
Dated this 6th day of April 1891.
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicants.
COMPLETE SPECIFICATION.
An Improved Bolt for Lavatory and other Doors.
I WILLIAM MAW TROUSDALE of Kingslyn Harrogate in the County of York
Engineer and JOSEPH LOWES THOMPSON 15 Thornhill Terrace, in the County of
Durham Shipbuilder 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 :--
Our invention relates to an improved bolt for lavatory and other doors and is
screwed on the inside of the door, the section of the bolt being square or cylindrical,
the end of which is set off from the back-plate to allow for a working joint having
a conical corner on the neck which a pivoted drop-piece works on and having a
finger-piece which acts as a collar fixed on it to prevent it coming off. The drop-
piece hangs in the vertical position by its own weight. There is on the boss of the
drop-piece at right angles to the knob an arm having the working face er cheek
[Price 8d.1

page_text: rounded and formed and the opposite side flat which acts as a locking-piece con-
jointly with the back-plate, which has two elongated slot-holes in 'it, one to lock the
bolt when shot into the bolt-staple the other to prevent it being shaken out of its
position when not in use, the door being recessed to allow the arm to work freely
in it.
When
There is fixed on the inside architrave of the door-frame a bolt-staple covering a
lever which works clear of the face of the architrave, the staple is made large
enough to allow for a revolving movement, being shaped to suit the bolt and
elongated so as to admit the bolt if in course of time the door should sag.
the door is closed the bolt comes in a straight line with the edge of a lever connected
to an indicator or otherwise and above the centre, so that when the finger-piece is
pressed the bolt is shot into the staple automatically locking itself in a slot-hole in
the back-plate, the drop-piece by its own weight revolving downwards and the
locking-arm on the same revolving upwards and cannot be withdrawn without the
drop-piece being released.
When the bolt is used in the vertical position the drop-piece or locking-arm is
pivoted near the end of the bolt being engaged by a double eye and pin which
passes through the bolt. And when pressed upwards by the finger-piece disengages
the locking-arm which is rounded on the working-face or check and automatically
engages in the upper slot-hole in the back-plate, the locking arm being so formed
that it cannot be shaken loose. The drop or locking-piece may be disengaged by
withdrawing it from the slot-hole then the bolt can be withdrawn.
The aforesaid bolt may be used in conjunction with or without an indicator.
When the bolt is used as a vertical flush-bolt the frame of the bolt is formed
with a recess in it and having two elongated slot-holes which are lineable with the
bolt-bar being so arranged to slide in the frame. The drop or locking-piece is
pivoted near the end of the bolt-bar being so arranged with a locking-arm and
engaged to it by means of a double eye and pin. There is fixed on the bolt-bar a
finger-piece to shoot or withdraw the bolt.
The drop-piece being pivoted on the bolt-bar hanging in the vertical position by
its own weight and arranged with locking-piece having the working-face or cheek
rounded and formed and when not in use resting in the bottom slot-hole made in
the recess of the bolt-frame.
There is a finger-piece fixed on the bolt-bar and when it is lifted to shoot the
bolt the pivoted drop-piece arranged with locking-arm will leave the bottom slot-
hole made in the recess of the frame and automatically engage in the upper one
and retain the bolt-bar.
The drop or locking-piece may be disengaged by withdrawing it from the
slot-hole then the bolt may be withdrawn.
When the bolt is, used with the nose to shoot downwards the bolt-bar being lifted
by the finger-piece from the bolt-staple the pivoted drop-piece arranged with
locking-arm will automatically in conjunction with the upper slot-hole made in the
recess of the frame engage the bolt-bar.
We do not bind ourselves to any particular shape or position in which the bolt
may be fixed, being varied and used as a flush or tower-bolt.
The following is a description of the said bolt, reference being had to the
accompanying drawings.
'
Fig. 1 is an elevation of the bolt disengaged. A the back-plate, B the bolt,
CC the straps to keep the bolt in position, D D the stop-pieces which prevent the
bolt being overshot, the pivoted drop or locking-piece, F slot-holes in which
the pivoted drop or locking-piece engages, G, the finger-piece used to shoot or
withdraw the bolt.
Fig. 2 is a side view of Fig. 1 A. the back-plate, B the bolt, C C. the straps,,
DD the stop-pieces, the spur or locking arm engaged in the slot-hole of the
back-plate.
FF the slot-holes, G the finger-piece, H the conical neck of the bolt upon
which the drop-piece or locking-arm revolves.

page_text: Fig. 3 is the same as Fig. 1 showing the position of the bolt with the bolt-staple
marked and showing the lever K of the indicator.
Fig. 4 is an elevation of the bolt in the vertical position A the back-plate, B the
bolt, CC the straps, D D the stop-pieces, the spur or locking-arm having a
double eye, F F the slot-holes, G the finger-piece to shoot or withdraw the bolt,
1. the pin upon which the drop-piece is pivoted to the bolt.
Fig. 5 is a side view of Fig. 4 A. the back-plate, B the bolt, C C the straps,.
DD the stop-pieces, the spur or locking-arm engaged in the slot-hole of the
back-plate, F F the slot-holes, G the finger-piece.
Fig. 6 is a side view of the elongated bolt-staple.
Fig. 7 is a section of Fig. 2 A the back-plate, B the bolt, C the strap, E the
drop or locking-piece, H the conical neck.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1st. The construction of parts constituting the improved bolt constructed
arranged and operating as herein before described with reference to the drawings.
2nd. The elongated slot-holes in back-plate.
3rd. The improved locking-arm or spur on the drop-piece we do not claim for the
pivoted arm as new but in combination with the locking-arm or spur.
4th. The conical neck on which the pivoted drop-piece revolves but we do not
claim for the bolt-bar but for the construction of the locking-arm in connection
therewith.
5th. The elongated bolt-staple.
6th. The combined collar and finger-piece.
WILLIAM MAW TROUSDALE.
JOSEPH LOWES THOMPSON.