IM- PROVEMENTS IN SPRING BOXES for CarriageS AND OTHER LOCKS OR LATCHES
Year: 1877

page_text: LETTERS PATENT to Sanuel Sanders, of Falling's Heath, Wednesbury, in the
County of Stafford, Gun Lock Manufacturer, for the Invention of "IM-
PROVEMENTS IN SPRING BOXES for CarriageS AND OTHER LOCKS OR LATCHES."
Sealed the 21st May 1878, and dated the 30th November 1877.
PROVISIONAL SPECIFICATION left by the said Samuel Sanders at the Office
of the Commissioners of Patents on the 30th November 1877.
SAMUEL SANDERS, of Falling's Heath, Wednesbury, in the County of Stafford,
Gun Lock Manufacturer. "IMPROVEMENTS IN SPRING BOXES FOR CARRIAGES AND
OTHER LOCKS OR LATCHES."
This Invention consists of an improved spring, and also of an improved latch or
tumbler.
It will be sufficient to describe the manufacture of a spring and latch connected
with a spring box for a carriage, the box being cast so that a coverplate, either
screwed or rivetted, is sufficient to secure the entire works.
The peculiarity of the spring is, that it is double, with a steady pin at the fold;
the form of the spring is V shaped, with the blades curved a little outward. I
prefer to make them with the best cast refined steel, and in forging them they are
set down so as to leave a projection, which said projection is afterwards drawn out
a little, and when the spring is bent or folded the pin is run down with a cutter to
the required size. I prefer to have the springs a little taper on the fint, and when
made according to this description, and tempered according to the nature of the
steel, their action is far superior to those hitherto used, they may be replaced by
another by simply placing the steady pin in the hole provided, and screwing on
the cover.
My improved latch is manufactured of the form required, and by either brazing,
rivetting, screwing, or welding in the part that has frictional contact with the spring,

page_text: a piece of steel, and may be either hardened or not; I also in some cases make the
latch or tumbler all steel, the object being a frictional contact of steel and steel,
thereby greatly reducing the friction, and consequently the power required to
propel or withdraw the latch or bolt.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Samuel Sanders in the Great Seal Patent Office on the 28th May
1878.
SAMUEL SANDERS, of Falling's Heath, Wednesbury, in the County of Stafford,
Gun Lock Manufacturer. "IMPROVEMENTS IN SPRING BOXES FOR CARRIAGES AND
OTHER LOCKS OR LATCHES."
This Invention consists of an improved spring, and also of an improved latch or
tumbler.
It will be sufficient to describe the manufacture of a spring and latch connected
with a spring box for a carriage, the box being cast so that a cover plate, either
screwed or rivetted, is sufficient to secure the entire works.
The peculiarity of the spring is, that it is double, with a steady pin at the fold;
the form of the spring is V shaped, with the blades curved a little outwards; I
prefer to make them with the best cast refined steel, and in forging them they are
set down so as to leave a projection, which said projection is afterward drawn out
a little, and when the spring is bent or folded, the pin is run down with a cutter
to the required size. I prefer to have the springs a little taper on the flat, and when
made according to this description, and tempered according to the nature of the
steel, their action is far superior to those hitherto used; they may be replaced by
another by simply placing the steady pin in the hole provided, and screwing on
the cover.
My improved latch is manufactured of the form required, and by either brazing,
rivitting, screwing, or welding in the part that has frictional contact with the
spring a piece of steel, and may be either hardened or not; I also in some cases
make the latch or tumbler all steel, the object being a frictional contact of steel and
steel, thereby greatly reducing the friction, and consequently the power required to
propel or withdraw the latch or bolt.
Figure 1 shews a spring box with the cover removed; a is the latch; b is the
spring.
Figure 2 shews the latch half open, and the spring nearly collapsed; the perfect
action of the spring is secured by uniformity, and the pivot or steady pin c, shewn
at Figure 3 in side view; this steady pin is made to drop into a hole at d, Figure
4; the forging of the spring is shewn at Figure 5, and when bent at the centre, the
projection e is run down to make it of the proper form to fit the hole d; the box
shewn is a cast metal one; a face view of the box is shewn at Figure 6.

page_text: The friction steel may be fixed at the frictional part of the latch at ƒ by casting
it in, or by any other convenient method.
Having now described the nature of my Invention, I wish it to be understood I
do not confine myself to the exact form of the latch and spring, but what I claim
is, the manufacture of a double spring with pivot, so as to allow freedom to both
blades, and yet keep the spring fixed at the pole in the manner shewn and
described.
In witness whereof, I, the said Samuel Sanders, have hereunto set my
hand and seal, this Twenty-third day of May, in the year of our Lord
One thousand eight hundred and seventy-eight.
Witness,
JOSEPH COOKE.
SAMUEL SANDERS. (L.S.)