Improvements in the Construction and Manufacture of Cases for Rim. Locks and Latches.
Year: 1896

page_text: Date of Application, 30th June, 1896
Complete Specification Left, 30th Mar., 1897-Accepted, 8th May, 1897
PROVISIONAL SPECIFICATION.
Improvements in the Construction and Manufacture of Cases for Rim.
Locks and Latches.
We, CHARLES WILLIAM TONкS, ENOCH TONкS, and GEORGE ARTHUR
TONKS, trading together in co-partnership as E. Tonks & Sons, of 35 Temple
Bar, Willenhall in the County of Stafford, Lock Manufacturers, do hereby
declare the nature of this invention to be as follows:-
This invention relates to the cases of rim locks and latches; and has for its
main object an improved method of avoiding the use of rivets made separately
from a rim for the purpose of fixing the rim or parts thereof to the plate of the
case, whereby the rim or parts thereof may be more conveniently fixed to the plate
than in the methods heretofore adopted for dispensing with such separately made
rivets and the case considerably strengthened. The invention comprises certain
improvements in the rim and, also, means of fixing the rim or parts thereof to the
plate, and improved means for supporting the cap-plate.
According to this invention, the rim cr portions thereof which are to be fixed
to the plate is, or are each, formed of a section in which an inward flange runs
along the edge of the side which is to be fixed direct to the plate, and an outward
flange at right angles to the inward flange runs along the inner edge of such inward
flange. The rivets by which the rim or any portion thereof is to be held to the
plate are formed by cutting away portions of the outward flange, leaving only the
rivets standing out from the edge of the inward flange. The rim or each portion
thereof formed in this manner is riveted to the plate by first passing the rivets
through the holes formed to receive them in the plate, then resting the side of
the plate to which a straight length or a portion of the rim is to be fixed against
one inclined face of a concave angle-die and the back of the length or portion of
the rim against the other inclined face of such die, and then bringing down a convex
angle-shaped die into the angle formed between the inner side of the length or
portion of the rim and the upper side of the inward flange thereof, and thus pressing
the rivets tightly down within the holes of the plate, causing them to expand
within the holes and to spread somewhat beyond the backs thereof and thus securely
tighten themselves to the plate. To facilitate the secure riveting, the holes in the
plate are, preferably, punched from the inner face so that they will enlarge some-
what outwards. The increased bearing surface of the rim, or parts thereof which
are riveted to the plate, resulting from the formation of the inward flange, gives
greatly increase I strength to the case; and it will be observed that, notwithstanding
that the rivets are formed with the rim or lengths thereof, the rivet holes through
the plate are as far inwards from the edge thereof as when the ordinary separately
made rivets are used.
A rim or each portion thereof for fixture in the manner aforesaid is formed,
preferably, also with a ledge, which stands out as a rib, along its inner face for the
cap-plate to bear against, and the outer face of such rim or portion may either be
fluted or plain, or of any other shape desired.
The metal for rims or portions thereof, to be fixed in the manner aforesaid,
may be cut off from lengths rolled or cast to the desired section, or may be each
forined as separate castings.

page_text: If the rims or portions aforesaid to be fixed in the manner described are formed
of cast metal, the rivets may be formed in the process of casting, in lieu of
casting an outward flange and cutting out the portions of the metal between
the rivets.
Dated this 29th day of June 1896
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicants.
Improvements in the Construction and Manufacture of Cases for Rim
Locks and Latches.
We.. CHARLES WILLIAM TONKS, ENOCH TONкS, and GEORGE ARTHUR
TONKS, trading together in co-partnership as E. Tonks and Sons, of 35 Temple
Bar, Willenhall in the County of Stafford, Lock Manufacturers, 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 the cases of rim locks and latches; and has for its
main object an improved method of avoiding the use of rivets made separately from
the rim for the purpose of fixing the rim to the plate of the case, whereby the rim
may be more conveniently fixed to the plate than in the methods heretofore
adopted for dispensing with such separately made rivets and the case considerably
strengthened. The invention comprises certain improvements in the rim and, also,
means of fixing the rim to the plate, and improved means for supporting the
cap-plate.
According to this invention, each portion or length of the rim is formed of a
section in which an inward flange runs along the edge of the side which is to be
fixed direct to the plate, and an outward flange at right angles to the inward
flange runs along the inner edge of such inward flange. The rivets by which each
portion or length of the rim is to be held to the plate are formed by cutting away
portions of the outward flange, ieaving only the rivets standing out from the edge
of the inward flange. Each portion or length of the rim formed in this manner is
riveted to the plate by first passing the rivets through the holes formed to receive
them in the plate, then resting the plate to which a portion or length of the rim
is to be fixed against one inclined face of a concave angle-die and the back of the
length or portion of the rim against the other inclined face of such die, and then
bringing down à convex angle-shaped die into the angle formed between the inner
side of the portion or length of the rim and the upper side of the inward flange
thereof, and thus pressing the rivets tightly down within the holes of the plate,
causing them to expand within the holes and to spread somewhat beyond the backs
thereof and thus securely tighten themselves to the plate. To facilitate the secure
riveting, the holes in the plate are, preferably, punched from the inner face so that
they will enlarge somewhat outwards. The increased bearing surface between the
rim and plate, resulting from the formation of the inward flange along each length
or portion of the rim, gives greatly increased strength to the case; and it will
be observed that, notwithstanding that the rivets are formed with the rim, the
rivet holes through the plate are as far inwards from the edge thereof as when the
ordinary separately made rivets are used.
Each portion or length of the rim, whether for fixture in the manner aforesaid or
otherwise, is formed, preferably, with a ledge, which stands out as a rib, along its
inner face for the cap-plate to bear against.

page_text: In order that the invention may be clearly understood, we will describe the same,.
more especially, with reference to the accompanying drawings, of which
Figure 1 is a transverse section through a length or one side of a rim previously
to the formation of the rivets by which the same is to be fixed to the back plate of
a lock or latch case.
Figure 2 is an inner face view of a short length of the side of the rim shewn in
section by Figure 1.
Figure 3 is a corresponding view to Figure 2, but shews the full length of the
side of the rim, and shews portions of the outward flange to have been cut away
and the rivets thereby formed for fixing the length to the back plate of the lock or
latch case.
Figure 4 is a transverse sectional view shewing the method by which a length of
rim is fixed to the back plate of the lock or latch case.
Each length A of rim is formed with an inward flange a along the edge thereof
which is to be fixed direct to the plate B of the lock or latch case, and is originally
formed with an outward flange b which projects from the edge. of the flange a, at
right to such flange, as shewn. Portions of the flange. b are cut away, as shewn by
Figure 3, so as to leave rivets e projecting downwards from the inner edge of the
flange a. Holes are punched through the plate B of the lock or latch case to
receive the rivets c, and these holes are preferably punched from the inner side of
the plate in a manner which causes them to enlarge somewhat towards the outer
side of the plate as will be readily understood. To fix a length A. of rim along the
edge of the plate B, the rivets c are inserted in the holes formed therefor in the
plate, the plate is laid upon the bed of a concave angle-die C with the outer side or
back of the length A of the rim against a side D of the die C which is at right.
angles to the bed thereof, and a tool E is brought down into the angle which the
flange a of the length A of the rim makes with the main portion of such length of
the rim and pressing down upon the top of such flange securely tightens the rivets o
within the holes through the plate B, causing them to expand into the enlarging
width thereof when, as is preferred, the holes are formed to enlarge towards the
outer face of the plate B, or otherwise causing them to expand so as to tighten
themselves within the holes and to spread out over the edges of the holes at the
underside of the plate. The tools B and C may be carried in any suitable
press.
d is a rib which runs along the inner face of each side of the rim for the purpose
of supporting the cap-plate. When, as is preferred, this rib is formed with a
length of rim it is necessary, if the tool E is worked in a vertical direction as is
preferred, to fix the tool C with its bed in an inclined position, as shewn, so as to
throw the side of the rim at such an inclination with the tool E that such tool in
operating will clear the rib d; and in any case it is preferred to place the parts,
which are being fixed together, in an inclined position so that the tool E may come
well down into the angle of the side of the rim without liability of fouling against
the inner face of the side.
The operation of the tool E causes some tendency for the plate B to move in a
direction outwards from the side D of the tool C, and to counteract this a stop e
is formed as a projection from the face of the bed of the tool C.
The portion or length of rim shewn by the drawings is shewn with a flute f
running along its outer or back face; but the portions or lengths of rim made for
fixture in the manner above described may be plain along the outer face, or of any
shape at such face as may be desired..
The metal for the portions or lengths of the rim which are intended to be fixed
in the manner aforesaid may be cut off from lengths rolled or cast to the desired
section, or may each be formed as separate castings.
If the portions or lengths of the rim aforesaid which are to be fixed in the
manner described are formed of cast metal, the rivets may be formed in the process
of casting, in lieu of casting an outward flange b and cutting out the portions of the
metal between the rivets.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. Rim lock and latch cases having the portions or lengths of rim each formed
with an inward flange, such as a, along the edge thereof which is fixed to the back-
plate of the case, and rivets, such as b, formed to project from the inner edge of
such flange at right angles thereto, substantially as described.
2. Lengths of bar to be used in forming the portions or sides of the rims of rim
lock and latch cases, each formed with an inward flange, such as a, along the edge
thereof which is intended to be fixed to the back-plate of the case and with an
outward flange, such as b, along the edge of the flange a and at right angles thereto;
substantially as described for the purpose set forth.
3. In the manufacture of rim lock and latch cases, forming bars, from which the
portions or lengths of the rims are to be cut off, each with an inward flange, such
as a, along an edge thereof, and with an outward flange, such as b, along the edge
of the flange a and at right angles thereto, and forming the rivets for fixing the
portions or lengths of rim to the back-plates of the cases by cutting away portions
of the outward flange, substantially as described.
4. The method of fixing to the back-plate of a lock or latch case a portion or
length of rim formed with an inward flange a and rivets c projecting from the edge
of the flange at right angles thereto, according to which the rivets are inserted
within holes in the plate, the plate is laid upon the bed of a concave angle-die with
the outer side of the portion or length of the rim against the other face of such die
and a pressure tool is brought down upon the inward flange a, all substantially as
described.
5. A rib, such as d, formed along the inner face of each portion or side of the rim
of a rim lock or latch case to support the cap plate of the case, substantially as
described.
Dated this 29th day of March 1897.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicants.