CERTAIN IMPROVE- MENTS IN THE CONSTRUCTION AND MANUFACTURE OF DOOR BOLTS
Year: 1853

page_text: LETTERS PATENT to Henry McEvoy, of Birmingham, in the
County of Warwick, for the Invention of "CERTAIN IMPROVEMENTS
Sealed the 20th October 1853, and dated the 20th April 1853.
PROVISIONAL SPECIFICATION left by the said Henry McEvoy a
the Office of the Commissioners of Patents, with his Petition, on
the 20th April 1853.
I, HENRY McEvoy, of Birmingham, in the County of Warwick, do
hereby declare the nature of my said Invention for "CERTAIN IMPROVE-
MENTS IN THE CONSTRUCTION AND MANUFACTURE OF DOOR BOLTS "to be as
follows, that is to say:-
My improvement consist, firstly, in strengthening the plates of door
bolts by slightly raising them so as to form a rim around them; and at
the same time, and by the same means, (namely, by stamping,) I sink
the metal around the screw holes so as to form a countersink for the
heads of the screws that may be used in securing the bolt to a door
when in use.

page_text: Secondly, in forming a spring or springs in the bolt plate for holding
the bolt in any desired position: .
Thirdly, in forming the stops for regulating the throw of the bolt out
of the bolt plate:
Fourthly, in forming stops for retaining the bolt in or out, as it may
be desired; the said stops being formed out of the bolt plate:
Fifthly, in holding the bolt and plate together by means of clips or
ears, such clips or ears being passed through suitable openings from the
back of the plate cliping the bolt in front, and which clips or ears may
be further secured to the bolt plate by the screws used in securing the
bolt to the place where it may be used:
Sixthly, in forming bolt plates, as herein described, by means of
moulding and casting them of any suitable metal; but such bolt plates
so made will require to have the springs applied to them, instead of
being made out of the same:
Seventhly, in the forms of the iron which I propose using for the
bolts, and which form or forms I shew in the drawings annexed repre-
sented in six sections: And,
Lastly, in covering the front part or face of the bolt with thin sheet
hrass
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry M'Evoy, in the Great Seal Patent Office,
on the 20th October 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
HENRY MCEVOY, of Birmingham, in the County of Warwick, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of April, in the year of
our Lord One thousand eight hundred and fifty-three, in the sixteenth
...year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Henry McEvoy, Her special licence that I,
the said Henry McEvoy, my executors, administrators, and assigns, or

page_text: such others as I, the said Henry M°Evoy, my executors, adminis-
trators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Chan-
nel Islands and Isle of Man, an Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF DOOR BOLTS," upon the condition (amongst others
that I, the said Henry McEvoy, by an instrument in writing under
my hand and seal, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Henry McEvoy, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement (that is to say):
My improvements in door bolts may be placed under eight heads:
Firstly, in strengthening the plates of door bolts by slightly raising
them so as to form a rim around them; and at the same time, and by
the same means, namely, by stamping, I sink the metal around the
screw holes so as to form a countersink for the heads of the screws
that may be used for securing the bolt to a door when in use"
Secondly, in forming a spring or springs in the bolt plate for holding
the bolt in any desired position:
Thirdly, in forming the stops for regulating the throw of the bolt out
of the bolt plate:
Fourthly, in forming stops for retaining the bolt in or out, as it may
be desired, the said stops being formed out of the bolt plate:
Fifthly, in holding the bolt and plate together by means of clips or
ears, such clips or ears being passed through suitable openings from
the back of the plate, cliping the bolt in front, and which clips or ears
may be further secured to the bolt plate by the screws used in securing
the bolt to the place where it may be used:
Sixthly, in forming bolt plates, as herein described, by means of

page_text: moulding and casting them of any suitable metal; but such bolt plates so
made will require to-have the springs applied to them, instead of being
miade out of the sanic:
Seventhly, in the form of the iron which I propose using for the bolt
bars, and which form or forms I show in the drawing annexed, repre-
sented in six sections:
And, lastly, in covering the front part or face of the bolt with thin
sheet brass.
But in order that I may be well understood, I will proceed to de-
scribe the drawings hereunto annexed.
Figure 1, represents a top view of a bolt plate, having been cut out
and pierced by means of suitable tools and a common fly press, and
raised the process of stamping in the form shown in the transverse
sections taken through a, a, and b, b, Figures 2, and 3. Figure 4,
represents also a top view of a finished bolt; and Figure 5, a longi-
tudinal section taken through c, c, of the last Figure. The bar d, is
secured to the plate by the cars or straps e, e, shewn in end view by
the dotted lines Figure 2, and which further shows that the ends of the
strap e, is taken down through the slots f. f, and flattened outwards,
laying in the hollow of the plate, the screw holes passing through both.
9, 9, are springs formed in the plate, to be hardened by hammering, and
curved, as shown in the section, Figure 5, which springs are necessary
in preventing any looseness in the working of the bolt. The thumb
bit E, Figure 4, and 5, serves a double purpose; first, to hold by in
pushing the bar forward or backward; and, secondly, for retaining the
bar in its position, either in or out, as required; and this is effected in
the following way:The part H, passes through a round hole in the bar,
in which it freely turns, and also through the plate; but that part of II,
that passes into or through the plate must be of the shape shown at I,
Figure 1, which allows it freely to pass along the slot in the direction of
the arrow, required in pushing out the bar, the length of the slot deter-
mining the throw of the bolt; and it will be evident that by turning the
thumb bit H, in the direction of the dotted lines Figure 4, the part I,
Figure 1, will be at right angles to the slot (as also represented in dotted
lines), and which will, of course, have the effect of holding the bar in the

page_text: desired position. One end of the slot is enlarged into an oval form to
make the action of the bolt less positive in that direction.
Figs. 6, 7, and 8, are a repetition of the bolt last described, and
differs only in the form of the raised plate, and the mode adopted for
retaining the bar in the position, which may be described thus:-The
pin J, with the helical spring K, on its neck, is put through the bar
from the back, and secured by the knob L, being screwed to it in
front; the pin m, in the back of the bar fits in the slot of the plate n, n,
and regulates the throw of the bolt, as well as adjusting the bar to the
plate that the pin J, may be opposite one or other of the holes O, or P,
which it will pass into by the force of the spring.
Figures 9, 10, and 11, represent a front, back, and sectional view of
a flush bolt, in which I have applied the same means for retaining
the bar as described, and exhibited at Figures 1, 4, and 5; for the bar
cannot be forced back until the knob is turned, at right angles to its
present position; but the springs Q, Q, required for steadying the bar,
are made out of the straps or ears, instead of forming them out of the
bolt plate, as exhibited at Figures 1, and 6; and the bar of the bolt (as
will be seen by the section) is made hollow or tubular, which economises
the material, and lessens the weight without diminishing the strength.
Figures 12, 13, and 14, represent a front, back, and end view of a bolt,
the front being made of thin sheet brass or iron, and bent into the shape
represented, or may be any other suitable shape, according to the form
of the bars, as shown in sections at Figure 15.) The throw of the bar
is regulated by the length of the slot X, as in the Figure last described;
so also is the mode of retaining the bar in its position; and the springs
y, y, are somewhat similar, but flat, and are held by the front plate
clipping them, as well as by the screws necessary in fastening the bolt to
where it may be used.
Figure 16, represents a bolt suitable for coachhouses or other large
doors, enclosed railway trucks or waggons; and Figure 17, is a transverse
section of the same taken through W, W, and is provided with a flap R,
united to the bolt plate by the hinge joint S, S, which, being brought
up over the bolt, and secured by a padlock or common pin passed on
or through the staple T, affords great security, as the knob u, of the

page_text: bar, passing through the opening V, in the flap, prevents the bar from
being pushed back. The plate is représented raised, as in Figure 1, to
give additional strength; and the bar is represented hollow, as will be
seen at,, for the purposes described at Figure 11:
I have not thought it necessary to make any drawing in reference
to my improvement in bolt-plates, named under the sixth head of this
my Specification, as it is evident that the bolt plates exhibited at
Figures 1, 6, and 12, and which may be of any other shape or style
(fancy or plain) to suit particular places or taste, may also be cast
instead of being stamped from flat sheet iron.
And in like manner with the eighth part of this my Specification,
which refers to the covering of the front of bolt plates and bars with
thin sheet brass; and as the process is well understood, and common to
many
other articles of manufacture; I need only add that the brass shell
or covering must be stamped in the form of the plate intended to be
covered, but a little deeper, to allow of its being clipped over the edge,
which may be readily done with suitable tools.
In witness whereof, I, the said Henry McEvoy, have hereunto set
my hand and seal, this Nineteenth day of October, One thousand
eight hundred and fifty-three.