Improvements in Bolts for Doors, Windows, or other analogous purposes.
Year: 1892

page_text: Date of Application, 23rd June, 1892
Complete Specification Left, 15th Mar., 1893-Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Bolts for Doors, Windows, or other analogous
purposes.
I WILLIAM NEILSON, of 33 Ann Street, Glasgow, North Britain, Commercial
Traveller do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction and arrangement of
bolts for doors, windows and such like purposes, and more particularly intended
for that class of bolt known as a flush bolt, and its object is to provide that the said
bolt shall be automatically locked when in its shot position, and also similarly locks
when in its withdrawn position, in a much simpler manner than has hitherto been
done.
I will describe it as applied to a flush bolt :-The usual plate or frame is pro-
vided, having at its front end a portion turned at right angles thereto, in which is
a hole through which the nose end of the bolt slides.
At the other end of this plate is also the usual slot, along which the manipulating
knob or thumb piece slides, the part about the said slot being flush with the rest
part of the plate, or, it may be recessed or set back in the usual manner.
Through the front end, and upon the rear side of the plate therefore, slides the
bolt. The rear end of this bolt is preferably widened a little, and midway in such
widened part is a longitudinal slot. At or near each end of this slot recesses or
notches are formed (in each of the sides thereto) to receive the front end of a
spring catch, at each end of the movement of the bolt.
Carried above this slotted portion of the bolt is a flat spring, having its front end
turned down at right angles (or a little less), while its rear end secured to the
plate or frame, thus being a fixture, that is, having no sliding motion. The width
of this flat spring embraces the full width of the notches in the bolt. In the slot
in the bolt is carried a T lever, having a fulcrum hole at the junction of the short
arm with the double ended portion, by which it is jointed to the bolt, by a horizontal
pin passing through such hole and also through corresponding joint holes in the
bolt upon each side of the slot, and midway in its length. The short arm of this
T lever passes through the slot in the main plate, and thereby forms the manipu-
lating thumb piece or knob, while the other two ends form alternately lifters for
raising the spring catch.
Thus, when the bolt is shot forward, the catch end of the spring falls into the
rear notch or recess in the bolt, and thereby effectually prevents the withdrawal
of the bolt until the catch has been released. Lying beneath this spring catch
however, is the one end of the T lever, and upon proceeding to withdraw the bolt,
by drawing back the thumb piece (in the ordinary manner) the spring is first raised
clear of the notch which allows the bolt to be withdrawn. Immediately the bolt
reaches the end of its movement, the spring catch again drops into the other
recess or notch, and thereby holds the bolt firmly in its withdrawn position.
At this end of the movement, the other end of the raising lever lies beneath
the catch, so that upon proceeding to again shoot the bolt the said catch is
first raised clear of the notch, when the bolt may be shot forward.
Thus my bolt consists essentially of four parts viz., the frame, the bolt, the
spring catch, and the thumb lever piece. A plate or cover may or may not be
used to cover the moving parts at the rear of the main plate.

page_text: COMPLETE SPECIFICATION.
Improvements in Bolts for Doors, Windows, or other analogous
purposes.
I, WILLIAM NEILSON, of 33 Ann Street Glasgow, North Britain, Commercial
Traveller, 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 the construction and arrangement of
bolts for doors, windows and such like purposes, and more particularly intended for
that class of bolt known as a flush bolt, and its object is to provide that the said
bolt shall be automatically locked when in its shot position, and also similarly
locked when in its withdrawn position, in a much simpler manner than has hitherto
been done, and, in order to more particularly explain this my invention and in what
manner the same is to be performed, I have appended hereunto an illustrative
sheet of drawings upon which are figures and numbers of reference, similar numbers
referring throughout the several views to the same thing or part, and in which:
Fig. 1 is a side elevation of a bolt constructed according to this my invention,
having part of the side of the cover removed to show the interior.,
Fig. 2 is a sectional side view of the same, in which the bolt is withdrawn.
Fig. 3 is a sectional side view of the same in which the bolt is shot.
Fig. 4 is a detailed side view and Fig. 5 a detailed plan view of the bolt.
Figs. 6 & 7 are end and side detailed views of the T lever.
The usual plate or frame 1, is provided, having at its front end a portion 2,
turned at right angles, in which is a hole through which the nose end 3, of the
bolt 4, slides.
At the other end of this plate is also the usual slot 5, along which the manipu-
lating knob or thumb piece, 6, slides, the part about the said slot being recessed
or set back in the usual manner as is shown, or it may be left flush with the rest
part of the plate 1, if desired.
Through the front end 2, and upon the rear side of the plate 1, therefore, slides
the bolt 4. The rear end 7, of this bolt, is preferably widened a little, and
midway in such widened part is a longitudinal slot 8, (see Fig. 5).
At or near each end of this slot, recesses or notches 9, 9ª, are formed (in each of
the sides thereto) to receive the front end 10 of the flat spring catch 11, at each
end of the movement of the bolt. Carried above this slotted portion of the bolt
is the flat spring 11, having its front end 10 turned down at right angles (or a
little less), while its rear end is secured to the plate at 12, thus being a fixture,
that is, having no sliding motion. In some cases I may dispense with the
removable cover 13, in which case it will be readily seen that an upward
projection or bracket may be conveniently carried from the plate 1; to which the
said spring may be secured. The width of this flat spring embraces the full width
of the notches 9, 9", in the bolt. In the slot 8, in the bolt, is carried a T lever 14,
having a fulcrum hole 15, by which it is jointed to the bolt 4, by a horizontal
pin 16, passing through such hole and also through corresponding joint holes 15",
in the bolt upon each side of the slot 8, and midway in its length. The short
arm 6, of this T lever passes through the slot 5, in the main plate, and thereby
forms the manipulating thumb piece or knob, while the other two ends form
alternately lifters for raising the spring catch.
Thus, when the bolt 4, is shot forward, the catch end of the spring 11, falls into
the rear notch or recess 9ª, in the bolt, as seen in Fig. 3, and thereby effectually
prevents the withdrawal of the bolt until the catch has been released. Lying
beneath this spring catch however, is the one end 17, of the Ṭ lever, and upon
proceeding to withdraw the bolt, by drawing back the thumb piece 6, (in the
ordinary manner) the spring is thereby first raised clear of the notch, which allows

page_text: the lever together with the bolt to be slid along, and the nose end 3, is withdrawn.
Immediately the bolt reaches the end of its movement, the spring catch again drops
into the other recess or notch 9, and thereby holds the bolt firmly in its withdrawn
position.
At this end of the movement, the other end 18, of the raising lever lies beneath
the catch, see Fig. 2, so that upon proceeding to again shoot the bolt the said catch 11,
is again first raised clear of the notch 9, when the bolt may be shot forward.
Thus my bolt consists essentially of four parts viz., the frame 1, the bolt 4, the
spring catch 11, and thumb lever piece 14. A plate or cover 13, may or may not
be used to cover the moving parts at the rear of the main plate 1.
Having now particularly described and ascertained the nature of this my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination in a bolt, of the one part bolt 4, having the slot 8, and
cross notches 9, 9, and carrying also the lifting lever 14, having the manipulating
thumb piece 6, and lifters 17, and 18, with the spring catch 11, constructed and
operating after the manner shown and described.
Dated this 14th day of March 1893.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicant's Agent.