AN IMPROVED METHOD OF AND APPLIANCE FOR SECURING THE BLADES OF SCISSORS, SHEARS, SURGICAL INSTRUMENTS. AND OTHER SIMILAR ARTICLES.”
Year: 1880

page_text: LETTERS PATENT to William Simpson and William Thomas Wilkinson
'
· Simpson, of Sheffield, and Isaac Wilkinson, of Malin Bridge, Hillsbro', in
the County of York, for an Invention of "AN IMPROVED METHOD OF AND
APPLIANCE FOR SECURING THE BLADES OF SCISSORS, SHEARS, SURGICAL
INSTRUMENTS. AND OTHER SIMILAR ARTICLES.”
PROVISIONAL SPECIFICATION left by the said William Simpson, William
Thomas Wilkinson Simpson, & Isaac Wilkinson at the Office of the Com-
missioners of Patents on the 16th June 1880.
WILLIAM SIMPSON and WILLIAM THOMAS WILKINSON SIMPSON, of Sheffield,
and ISAAC WILKINSON, of Malin Bridge, Hillsbro', in the County of York.
"AN IMPROVED METHOD OF AND APPLIANCE FOR SECURING THE BLADES Of
SCISSORS, SHEARS, SURGICAL INSTRUMENTS, AND OTHER SIMILAR ARTICLES."
In scissors of ordinary construction one blade is recessed for the head of the
set-screw and is drilled for the stem thereof, and the other blade has a small
tapped or screw-threaded hole, into and through which the threaded part of the
set-screw is passed, by which the two blades are held together.
Our improvements consist in the use of a so called "screw lock plate," and the
adaptation thereto of scissors, shears, surgical instruments, and other similar
articles.
In carrying our improvements into effect the blade into which the head of tho
set-screw is inserted is of the ordinary form, and the set-screw also is of the
ordinary form, but the other blade is recessed like the first named blade for the
reception of the "screw lock plate," and has a smaller hole tapped or screw-threaded
into which the end of the set-screw enters, the said "screw lock plate" being
screwed onto the set-screw and fitting into the recessed hole in the blade, as does
the head of the set-screw in the first named blade.
The "screw lock plate" is by preference a disc of the same form (practically) as
the head of the set-screw, but drilled and tapped to screw onto the threaded part
of the set-screw.
The advantages of our improved mode of and appliance for securing blades
together are that the joint is firmer, and scissors or shears will remain longer
"on the cut" (technically so called) than do those joined together by ordinary
means and appliances.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Simpson, William Thomas Wilkinson Simpson, & Isaac
Wilkinson in the Great Seal Patent Office on the 16th December 1880.
WILLIAM SIMPSON, WILLIAM THOMAS WILKINSON SIMPSON, of Sheffield, and
ISAAC WILKINSON, of Malin-Bridge, Hillsbro', in the County of York.
AN
IMPROVED METHOD OF AND APPLIANCE FOR SECURING THE BLADES OF SCISSORS,
SILEARS, SURGICAL INSTRUMENTS, AND OTHER SIMILAR ARTICLES."
Our improvements relate to scissors, shears, surgical instruments, mathematical
instruments, and other similar articles.
In scissors of ordinary construction one blade is recessed for the head of the set
screw and is drilled for the stem thereof, and the other blade has a small tapped or
screw threaded hole, into and through which the threaded part of the set screw is
passed, by which the two blades aro held together.
Our improvements consist in the use of a so called screw lock plate, and the
adaptation thereto of scissors, shears, surgical instruments, mathematical instru-
ments, and other similar articles.
In carrying our improvements into effect the blade into which the hoad of the
set screw is inserted is of the ordinary form, but the other blade is recessed like the
first named blade for the reception of the screw lock plate, and has a smaller holo
tapped or screw threaded into which the end of the set screw enters and through
which it protrudes, the said screw lock plate being screwed onto the protruding
end of the set screw and fitting into the recessed hole in the blade, as does the head
of the set screw in the first named blade.
The screw lock plate is by preference a disc of the same form (practically) as the
head of the set scrow, but drilled and tapped to screw onto the threaded part of the
set-screw. The advantages of our improved mode of and appliance for securing
blades together are that the joint is firmer, and scissors or shears will remain
longer "on the cut" (technically so called) than do thoso joined together by ordinary
means and appliances.
In the accompanying Sheets of Drawings Fig. 1 is a side view of a pair of scissors
showing the head of the set screw A; Fig. 2 is a view of tho reverse side of tho
same pair of scissors showing the locking plate or lock nut B; Fig. 3 and Fig. 4
are enlarged views of each side of the joint of a pair of scissora, Fig. 4 showing thic
locking plato B; Fig. 5 is an enlarged view in cross section of the joint of a pair of
scissors showing the set screw A, locking plate or lock nut B, the set screw A
being fitted with a washer C of ordinary construction; Fig. 6 is an enlarged view
of the set scrow A and lock plate or lock nut B; Fig. 7 is a plan of the lock nut or
locking plate B, and Fig. 8 is a cross sectional view of the same.
Fig. 9, Fig. 10, and Fig. 11 show our improvements as applied to the leg joint of a
pair of mathematical instruments; Fig. 9 showing the head of the set screw A, and
Fig. 10 showing the lock plate B; Fig. 11 is a cross sectional view of the same
joint showing the set screw A, and lock plate B.
Fig. 12, Fig. 13, and Fig. 14 show our improvements as applied to the top joint
of a pair of mathematical instruinents.
Having now described and particularly ascertained the nature of our said
Invention, and specified in what manner it is or may be carried into effect, we
wish it to be understood that what we claim as novel and original, and secured
to us by the herein-before in part recited Letters Patent is,―
An improved method of and appliance for securing the blades of scissors, shears,
and surgical instruments, and the legs or other parts of mathematical instruments,
and other similar articles by screwing the set screw through a rocessed hole in one

page_text: blade or leg, and the employment therein and there with of a lock plate or nut fitted
into the said recess, and screwed onto the said set screw for the purpose of making
a firm and secure joint, as specified and described in reference to the accompanying
Drawings.
In witness whereof, I, the said William Simpson, on behalf of myself and
the said William Thomas Wilkinson Simpson, and on behalf of the said
Isaac Wilkinson, have hereunto set my hand and scal, this Fourteenth day
of December, in the year of our Lord One thousand eight hundred and
eighty.
WILLIAM SIMPSON. (L.B.)