AN IMPROVEMENT OR IMPROVEMENTS IN THE MANUFACTURE OF CERTAIN PARTS OF LOCKS
Year: 1876

page_text: LETTERS PATENT to Samuel Walton, of the Firm of Samuel Walton and Sons,
of Willenhall, in the County of Stafford, Rim Lock Manufacturers, for the
Invention of "AN IMPROVEMENT OR IMPROVEMENTS IN THE MANUFACTURE OF
CERTAIN PARTS OF LOCKS."
Sealed the 16th March 1877, and dated the 13th October 1876.
PROVISIONAL SPECIFICATION left by the said Samuel Walton at the Office
of the Commissioners of Patents on the 13th October 1876.
,SAMUEL WALTON, of the Firm of Samuel Walton and Sons, of Willenhall, in the
County of Stafford, Rim Lock Manufacturers. "AN IMPROVEMENT OR IMPROVEMENTS
IN THE MANUFACTURE OF CERTAIN PARTS OF LOCKS."
My Invention has reference to those parts of locks called the bridge plates. Each
of the said bridge plates consists of a flat plate of metal supported a short distance
from the bottom of the lock case by means of rivetted side pieces, the bottom ends
of the side pieces serving to rivet the bridge plate to the lock case. In the middle
of the bridge plate is a nearly circular hole called the "thimble," and in the lower
edge of the plate a V shaped recess is cut opening into the thimble. The bridge plate
has such a position in the lock that its "thimble" and V shaped recess are opposite
the keyhole. On the face of the said bridge plate two or more projecting pieces
technically called "stubs" are situated.
When the key is introduced into the lock its barrel takes into the thimble
described of the bridge plate, and the bits of the key take into the V shaped recess,
and when the key is partly rotated the wards of the key pass on to and over the
projecting pieces or "stubs," the rotation of the key being permitted by the
coincidence of the said wards with the said " stubs."
In the ordinary manufacture of the said bridge plates these projecting pieces or
"stubs" are made of separate pieces of sheet metal inserted in slots in the bridge
plate and fastened therein by brazing,
My Invention consists in making the said projecting pieces or "stubs" of the
bridge plate in one piece with the said plate, as herein-after described, whereby
great economy in the manufacture of the said bridge plates is secured.
In making a bridge plate according to my Invention I cut out the bridge plate from
sheet metal and raise the thimbel of the same by means of cutting and raising tools
I Prine 61

page_text: "
دو
worked in a press in the ordinary way; I then by means of other tools worked in a
press make from the face of the bridge plate two or more " stubs or projecting pieces
standing at right angles to the said plate. The metal of the bridge plate from
which the "stubs are made is pierced, and the pierced parts raised at right angles
to the plate at one operation. The stubs or projecting pieces on to and over
which the wards of the key pass may be made, according to my Invention, either
on the front or back of the bridge plate or both on the front and back.
By my Invention the brazing of the "stubs" to the bridge plate is dispensed
with, and the whole of the parts of which the bridge plate is composed are made by
press tools.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Samuel Walton in the Great Seal Patent Office on the 12th April
1877.
SAMUEL WALTON, of the Firm of Samuel Walton & Sons, of Willenhall, in the
County of Stafford, Rim Lock Manufacturers. "AN IMPROVEMENT OR IMPROVEMENTS
IN THE MANUFACTURE OF CERTAIN PARTS OF LOCKS."
My Invention has reference to those parts of locks called the bridge plates. Each
of the said bridge plates consists of a flat plate of metal supported a short distance
from the bottom of the lock case by means of rivetted side pieces or cheeks, the
bottom ends of the side pieces serving to rivet the bridge plates to the lock case. In
the middle of the bridge plate is a nearly circular hole called the "thimble," and in
the lower edge of the plate a V shaped recess is cut opening into the "thimble." The
bridge plate has such a position in the lock that its "thimble" and V shaped recess
are opposite the keyhole. On the face of the said bridge plate two or more projecting
pieces technically called "stubs are situated.
و"
"
When the key is introduced into the lock its barrel takes into the "thimble'
described of the bridge plate and the bits of the key take into the V shaped recess,
and when the key is partly rotated the wards of the key pass on to and over the
projecting pieces or "stubs," the rotation of the key being permitted by the coinci-
dence of the said wards with the said stubs.
In the ordinary manufacture of the said bridge plates these projecting pieces or
"stubs" are made of separate pieces of sheet metal inserted in slots in the bridge
plate and fastened therein by brazing.
My Invention consists in making the said projecting pieces or "stubs" of the
bridge plate in one piece with the said plate, as herein-after described, whereby
great economy in the manufacture of the said bridge plates is secured.
But to make my Invention better understood I will proceed to describe the same
by reference to the accompanying Drawing, in which Figures 1 and 2 are elevations
of the bridge plate of a lock manufactured according to my Invention, with the
ordinary side plates or cheeks applied thereto; Figure 3, a plan of same; and
Figure 4, an end elevation, one of the side plates or cheeks being removed; and
Figure 5, a vertical section on line a¹, 61, of Figure 1.
Similar letters in all the Figures represent similar parts.
In making a bridge plate according to my Invention I cut out the bridge plate a
from sheet metal and raise the "thimble" b of the same by means of cutting and
raising tools worked in a press in the ordinary way; I then by means of other tools
worked in a press make from the face of the bridge plate two or more "stubs " or
projecting pieces c, c, standing at right angles to the said plate a. The metal of the
bridge plate a from which the "stubs" c are made is pierced, and the pierced parts
raised at right angles to the plate, as shewn at one operation. The "stubs" or project-
ing pieces c on to and over which the wards of the key pass are shewn as made on
the front of the bridge, but it will be understood that they may be made on the back,

page_text: or both on the front and back of the plate; d, d, are the side pieces or cheeks
rivetted to the bridge plate in the usual manner.
By my Invention the brazing of the "stubs " c to the bridge plate a is dispensed
with and the whole of the parts of which the bridge plate is composed are made by
press tools.
Having thus described my said Invention, and the best means with which I ain
acquainted for carrying the same into effect, I wish it to be understood that what I
claim is, the improvement or improvements in the manufacture of certain parts of
locks, as herein-before described.
In witness whereof, I, the said Samuel Walton, have hereto set my hand
and seal, this Eleventh day of April, in the year of our Lord One thousand
eight hundred and seventy-seven.
SAMUEL WALTON. (L.S.)