Improvements in the Manufacture of Door Bolts.
Year: 1899

page_text: Improvements in the Manufacture of Door Bolts.
We, JONAH BANKS, of London Works, Clothier Street, Willenhall, in the
County of Stafford, Manufacturer, and JOSEPH HENRY BANKS, of the same address,
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:
Our invention relates to door bolts of the kind commonly called "Tower" bolts,
our improvements in the manufacture of the said bolts having for their object
to produce a bolt of great strength in which the staples and guides or checks,
in which the bolt proper works, are in one piece with the base or foundation plate.
In manufacturing a Tower" volt according to our invention we produce by
a piercing operation, preferably from soft sheet steel, a flat plate or blank of a
length somewhat greater than that of the base or foundation plate of the bolt to
be made, the said blank having holes in it for the fixing screws to pass through
and also an even number of D shaped holes or piercings, preferably six, along its
middle, and at a short distance apart the two D shaped holes or piercings at the
end which in the finished bolt is to be the outer or stop end of the bolt, being
connected by a slit or slot, the last named holes together with the slot somewhat
resembling in shape the letter H.
By a stamping or pressing operation, performed in a pair of dies, we raise the
portion of metal between each pair of holes in the blank into a semi-circular
figure in cross section and at the same time gather the metal about the semi-
circular raised part both in the direction of the length of the blank and in the
direction of its width so as to form in the blank a series of raised pyramidal
figures, each of which figures resembles the lower part of a pyramid surmounted
by a nearly semi-circular arch, the D shaped holes or piercing of the blank con-
stituting guide holes or ways in those sides of the pyramidal figures crossing
the direction of the length of the base or foundation plate. On the raising of
that part of the blank, the D shaped holes in which are connected by a slit or
slot, the said slit or slot is so opened or widened that the parts on either side of it
are formed into the parallel guides or cheeks for the handle of the bolt to work in.
The bolt proper is applied to the finished base or foundation and staple plate
and the stop fixed, preferably by riveting at the rear end of the said plate, when
the bolt is ready for use.
Tuber first dave of A1 1900
Improvements in the Manufacture of Door Bolts.
We, JONAH BANKS, of London Works, Clothier Street, Willenhall, in the
County of Stafford, Manufacturer, and JOSEPH HENRY BANKS, of the same address,
[Price 8d.]

page_text: Mechanical Engineer, do hereby declare the nature of our 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 door bolts of the kind commonly called "Tower" bolts,
our improvements in the manufacture of the said bolts having for their object
to produce a bolt of great strength in which the staples and guides or cheeks,
in which the bolt proper works, are in one piece with the base or foundation plate.
In manufacturing a "Tower" bolt according to our invention we produce by
a piercing operation, preferably from soft sheet steel, a flat plate or blank of a
length somewhat greater than that of the base or foundation plate of the bolt to
be made, the said blank having holes in it for the fixing screws to pass through
and also an even number of D shaped holes or piercings, preferably six, along its
middle and at a short distance apart the two D shaped holes or piercings at the
end which in the finished bolt is to be the outer or stop end of the bolt, being
connected by a slit or slot, the last named holes together with the slot somewhat
resembling in shape the letter H.
By a stamping or pressing operation, performed in a pair of dies, we raise the
portion of metal between each pair of holes in the blank into a semi-circular
figure in cross section and at the same time gather the metal about the semi-
circular raised part both in the direction of the length of the blank and in the
direction of its width so as to form in the blank a series of raised pyramidal
figures each of which figures resembles the lower part of a pyramiu surmounted
by a nearly semi-circular arch, the D shaped holes or piercing of the blank con-
stituting guide holes or ways in those sides of the pyramidal figures crossing
the direction of the length of the base or foundation plate. On the raising of
that part of the blank, the D shaped holes in which are connected by a shit or
slot, the said slit or slot is so opened or widened that the parts on either side of it
are formed into the parallel guides or cheeks for the handle of the bolt to work in.
The bolt proper is applied to the finished base or foundation and staple plate.
The stop is made in one piece with the foundation plate or fixed thereto by
rivetting, when the bolt is ready for use.
Figure 1 of the accompanying drawing represents in side elevation. Figure 2
in plan; Figure 3 in longitudinal section and Figure 4 in cross section, a com-
plete or finished "Towerbolt made according to our invention: Figure 5 repre-
sents in plan and edge view the blank from which the combined base plate,
staples, guides or cheeks and stop for the bolt proper is made: Figure 6 repre-
sents in plan, Figure 7 in side elevation and Figure 8 in cross section the com-
bined base plate, staples, guides or cheeks and stop produced by a stamping or
raising operation from the blank Figure 5. Figures 9 and 10 illustrate in plan
and side elevation the method of getting the sliding bolt into place.
The same letters of reference indicate the same parts in the several figures of
the drawing.
In manufacturing a bolt according to our invention we produce by a stamping
or piercing operation from mild sheet steel a blank of the kind represented in
Figure 5 the said blank having the D shaped holes a, a, a, a, H shaped slot b
and nearly crescent shaped slot e in addition to the usual piercings dd for the
fixing screws to pass through.
After the said stamping or piercing operation the blanks are annealed.
By a raising and drawing operation (as distinguished from bending) effected
in a pair of dies the annealed blanks are shaped as illustrated in Figures 6, 7
and d, staples e, e for the sliding bolt being thereby formed as well as a guide
way 62 and stop f for the handle or head of the bolt proper, the parts constituting
the staples and guides or checks surmounting pyramidal parts which pyramidal
parts are produced by the elongation of the blank, at the said parts, both in the
direction of its length and width in the raising and drawing operation. In order
to introduce the sliding bolt into the staples e, e it is first necessary to bend

page_text: the back end of the base plate at an angle to the longer part of the said base
plate as illustrated in Figures 9 and 10, so as thereby temporarily to remove the
stop from the axial line of the staples ce and holes aa. The bolt g having been
passed through the holes aa and under the staples ee into the dotted position
indicated in Figure 10, the rear or stop end of the base plate is bent back into.its
original position and the stop thereby brought in line with the bolt proper.
The bolt proper g can now be shot backward and forward through the guide
way 62 and turned down into one or other of the cross depressions h, h², as usual.
Instead of using a stop f in one piece with the plate, which stop f necessitates
the bending of the shaped blank for permitting of the introduction of the bolt
proper g, we may employ a stop separate from the base plate and rivet the same
thereto in the ordinary way after the bolt has been passed through the holes and
staples in the plate.
Having now particularly described and ascertained the nature of our inven
tion and in what manner the same is to be performed we declare that we claim
as our said invention:-
The improvements in the manufacture of door bolts of the kind commonly
called "Tower" bolts hereinbefore described and illustrated in the accompanying
drawing, the said improvements consisting essentially in making by a stamping
or piercing operation a blank having holes or piercings substantially of the kinds
illustrated in Figure 5 and by a raising and drawing operation elongating at cer-
tain parts the metal of the blank both in the direction of the length and width
of the blank, and thereby producing a combined base plate, staples and guides or
cheeks, or a combined base plate, staples, guides or cheeks and stop, the bolt
proper being applied in the case of a combined base plate, staples, guides or
cheeks and stop in the manner herein before described and illustrated.
Dated this Nineteenth day of December 1899.
JONAH BANKS.
JOSEPH HENRY BANKS.