IMPROVEMENTS IN BARREL DOOR BOLTS
Year: 1884

page_text: I JONAH BANKS of London Works Clothier Street Willenhall in the County
of Stafford Manufacturer do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN BARREL DOOR BOLTS" to be as follows:-
My invention consists in constructing and arranging the parts of barrel door
bolts in the manner hereinafter described the object of my said invention being to
prevent the forcing back of the bolt from outside the door by the use of instruments
pressing against the end of the bolt or against the knob of the bolt.
Instead of connecting the knob rigidly to the bolt in the ordinary manner I fix the
said knob on a pin or stem which passes through the bolt working freely in a hole
therein. The said pin or stem is fixed near its lower end to the moveable end or the
middle of a flat spring the fixed end of which spring is rivetted to the underside of
the bolt the bolt having a slot in which the said spring is capable of moving
through a small angle. The extreme end of the pin or stem described projects
below the spring and is pressed by the said spring upon the fixing plate of the
bolt. In the said fixing plate is a hole at that part opposite which the end of the
pin or stem is situated when the bolt is in its shot position and in which hole
the end of the stem is pressed by the spring when the bolt is shot. The engagement
of the said stem in the said holo prevents the return of the shot bolt either by
pressure on the end of the bolt or by pressure on the knob of. the bolt in the
direction proper to withdraw the bolt. Before the bolt can be withdrawn it is
necessary that the knob be drawn outwards or from the fixing plate so as to
withdraw the end of the stem from the hole in the fixing plate. The bolt can now
'be withdrawn in the ordinary way.
In shooting the bolt by pressure on the knob it is only necessary to press it as
in the ordinary bolt inasmuch as when the bolt is fully shot and the bottom of the
pin or stem brought opposite the hole in the fixing plate the engagement of the
said pin or stem in the said hole is effected automatically by the spring. The bolt
is thus locked in its shot position.

page_text: COMPLETE SPECIFICATION.
I JONAH BANKS of London Works, Clothier Street, Willenhall in the County
of Stafford, Manufacturer do hereby declare the nature of my Invention for
"IMPROVEMENTS IN BARREL DOOR BOLTS" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
My invention consists in constructing and arranging the parts of barrel door
bols in the manner herein after described, the object of my said invention being to
prevent the forcing back of the bolt from outside the door by the use of instruments.
pressing against the end-of-the-bolt or against the knob of the bolt.
Insteart of connecting-the-knob-rigidly-to-the-bolt-in-the-ordinary-manner.Lfix_
the said knob on a pin or stem which passes through the bolt, working freely in a
bole therein.
The said pin or stem is fixed near its lower end to the moveable end or the
middle of a flat spring, the fixed end of which spring in the former case is rivetted
to the underside of the bolt, the bolt having a slot in-which-the-said-spring-is-
capable of moving. The extreme end of the pin or stem described projects below
the spring and is pressed by the said spring upon the fixing plate of the bolt. In
-the-sai-fixing-plate is a hole at that part opposite which the end of the pin or stem
is situated when the bolt is in its shot position and in which hole the end of the
stem is pressed by the spring when the bolt is shot. The engagement of the said
stem in the said hole prevents the return of the shot bolt either by pressure on the
end of the bult or by pressure on the knob of the bolt in the direction proper to
withdraw the bolt. Before the bolt can be withdrawn it is necessary that the
knob be drawn outwards or from the fixing plate so as to withdraw the end of
the stem from the hole in the fixing plate. The bolt can now be withdrawn in
the ordinary way.
In shooting the bolt by pressure on the knob it is only necessary to press it as
in the ordinary bolt inasmuch as when the bolt is fully shot and the bottom of the
pin or stem brought opposite the hole in the fixing plate, the engagement of the
said pin or stem in the said hole is effected automatically by the spring.
The bolt is thus locked in its shot position.
Figure 1 of the accompanying Drawing represents in front elevation; Figure 2.
in longitudinal section and Figure 3 in end elevation a barrel door bolt constructed
according to my invention, the bolt being represented in its withdrawn position;
Figure 4 represents in longitudinal section and Figure 5 in back elevation the
said door bolt with the bolt in its shot and locked position; Figure 6 represents
the bolt detached from the barrel and Figures 7, 8 and 9 are parts of the locking
mechanism detached.
The same letters of reference indicate the same parts in the several Figures of
the drawing.
a is the bolt; b the barrel and c the fixing plate of the bolt rivetted to the said
barrel; & is the knob by which the bolt a is shot and withdrawn the said bolt
having such a figure that it is capable only of sliding, that is, cannot rotate in the

page_text: barrel; e is the pin or stem (shown separately in Figure 8) to which the knob d is
connected by rivetting, the said pin or stem e passing through and working freely
in the guide tube f (shown separately in Figuro 9) fixed in a hole in the bolt a as
seen in Figures 2 and 4. The inner end of the said pine has a head or enlarge-
ment e upon it against which the middle of the bow spring g bears the said spring
pressing the head of the pin e against the fixing plate c.
In the rear and underside of the bolt a is a recess or slot A in which the spring g
is situated, the said recess or slot permitting the spring to have a slight movement
therein to and from the fixing plate. The spring g seats itself in the recess h and
is not fixed therein; i is a hole in the fixing plate c the said hole having such a
position in the said plate that when the bolt a is in its shot position the head e³ of
the pin or stem e snaps into the said hole by the action of the spring g and fastens
the bolt in its shot position as illustrated in Figures 4 and 5. The ongagement
of the head e' of the stem of the knob in the hole i prevents the return of the
shot bolt a either by pressure on the end of the bolt or by pressure on the knob d
in the direction proper to withdraw the bolt.
In order to withdraw the shot bolt a it is necessary first to press or pull the
knob d outwards in the direction indicated by the arrow in Figure 4. By this
outward motion of the knob d the head eª of its stem is withdrawn from the hole i
in the fixing plate c and the spring 9 is compressed or flattened. The bolt a is
thereby unlocked and can now be withdrawn as illustrated in Figure 2. On
shooting the bolt a by pressure on the knob d the said knob is pressed forward in
the ordinary way of shooting door bolts, the head e² of the stem of the knob on the
bolt reaching its fully shot position engaging in the hole i and thus automatically
locking the said bolt in its shot position as herein before described.
The pin or stem e of the bolt knob d may be connected to one end of a flat
spring instead of to the middle of the bow spring represented in the drawing.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is of "Improvements in barrel door bolts'
"
Connecting the pin or stem of the knob of the bolt to a flat or bow spring
situated in a recess in the lower end and underside of the bolt, the said spring
pressing the inner end of the said pin or stem upon the fixing plate of the bolt
and the combination with the said spring knob of a hole in the fixing plate of the
bolt into which hole the inner end of the pin or stem of the spring knob snaps
when the bolt is fully shot and thereby automatically locking the bolt in its shot
position for the purpose and substantially as herein before described and illustrated
in the accompanying Drawing.