A New or Improved Combined Latch and Bolt.
Year: 1888

page_text: Date of Application, 18th Oct., 1888
Complete Specification Left 17th July 1889 Accepted 17th Aug
1884
PROVISIONAL SPECIFICATION.
A New or Improved Combined Latch and Bolt.
I, ALLAN HUGH BREMNER of Traill Street, Thurso, in the County of Caithness, .
Ironmonger, do hereby declare the nature of this Invention to be as follows:-
Under my invention an ordinary thumb latch for a door or gate is made to serve
as a bolt which cannot be withdrawn from outside. This is effected by forming a slot
in the latch where it is secured to the door by the usual centre pin so that the latch
may be moved or shifted longitudinally to bring its free end within a staple on the
door frame when it is desired to bolt the door or to withdraw it from the staple when
it is to serve as an ordinary latch.
To prevent its being shaken out of or into the locking staple the latch is extended
at its opposite end beyond the centre pin and is fitted with a jointed finger piece
which is engaged in either position of the latch by a stop or stops over which the
finger piece is raised in shifting the latch.
Dated this Seventeenth day of October 1888.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
A New or Improved Combined Latch and Bolt.
I, ALLAN HUGH BREMNER of Traill Street, Thurso, in the County of Caithness,
Ironmonger, 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:
Under my Invention an ordinary thumb latch for a door or gate, is made to serve
as a bolt which cannot be withdrawn from outside. On the accompanying drawings
Figures 1, and 2, are perspective elevations of my improved combined latch and
bolt, Figure 1 showing the apparatus in the position in which the latch a, cannot
be raised from the outside whilst Figure 2 shews the latch in position for being so
raised to open the door. These objects are effected by forming a longitudinal slot b
in the latch a, at the part where the latch is centred on the door or gate by the
usual centre pin c, which pin is rivetted or screwed into or otherwise fastened to a
plate d, secured to the inside of the door. By the provision of the slot b, when it is
desired to bolt the door, the latch a, can, as seen at Figure 1, be moved or shifted
longitudinally to bring its free end a¹, within a vertical slot e or within a staple made in
or fixed to a plate f, which carries the ordinary sneck or catch g, for the latch, which
plate is secured to the inside of the door casing the free end of the latch being
withdrawn from the said slot, as seen at figure 2, when the apparatus is to serve as
an ordinary latch.
To prevent the latch being shaken out of or into the locking slot e, it is extended
beyond the centre pin c, and at that end, which is bent at right angles, a finger
piece h, is jointed to it which piece engages, in either position of the latch, with one
or other side of a stop i, formed on the plate d, and over which the finger piece is
raised when shifting the latch. The slot e, in the plate f, is made of such length
and the stop i, on the plate d, is duplicated in order that the improved latch may be
fitted to doors opening either from the right or left hands.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The new or improved combined latch and bolt constructed substantially as herein-
before described with reference to the accompanying drawings.
2. In a door latch the combination of a slotted latch piece a, a finger piece h, jointed
thereto a stop or stops i, and a slotted staple plate f, substantially as. set forth with
reference to the drawings annexed.
Dated this Sixteenth day of July 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.