like Cross Limbed Instruments.
Year: 1885

page_text: like Cross Limbed Instruments.
We, SAMUEL GRAY RICHARDSON, of Doncaster Street, Sheffield, Cutler, and
EDWIN KAY, of Doncaster Street, aforesaid, Working Cutler, 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 reference
being had to the accompanying drawing and to the letters and Figures marked
thereon, that is to say :-
Our Invention has reference to a new or improved joint screw or connection for
scissors, shears and other like cross limbed instruments such for instance as
champagne nippers, pliers and pincers, our object being to prevent the two limbs
of such instruments becoming loose at the joint when worn.
Each of our new or improved joint screws for such instruments has formed upon
it a right hand and a left hand screw thread; that part on which the right hand
screw thread is formed being screwed into, or otherwise connected to, one limb of
the instrument and that part on which the left hand screw thread is formed being
connected to the other limb thereof.
On the accompanying sheet of drawings Fig. 1 represents a front view of a pair
of scissors with our new or improved joint screw applied and Fig. 2 is a part back
view of the same; Fig. 3 shews on an enlarged scale partly in section part of the
scissors represented in Figs. 1 and 2 and the joint screw separately; Fig. 4 is an
enlarged part back view of the same; Fig. 5 shews the screw and Fig. 6 the nut
for the same separately; Fig. 3* shews the application of a modified form of the
joint screw or connection represented by Fig. 3, and Fig. 5* represents the joint
screw shewn in Fig. 3* separately; Figs. 7, 8, 9 and 10, 7* and 9*, 11, 12 and 13
illustrate modifications of our Invention as hereinafter fully described.
We will first describe our Invention as applied to a pair of scissors and refer to
Figs. 1 to 6, both inclusive, in which the same letters of reference indicate the same
parts.
A, A¹ are the two cross limbs of the pair of scissors connected together by the
joint screw B (shewn separately at Fig. 5) which according to our Invention has a
right hand screw thread b¹ and a left hand screw thread be formed upon it. The
screw B is formed with a head b in the ordinary manner. The part b' is screwed
into the limb A and on the part 6³ is screwed a nut C (shewn separately by Fig. 6)
so as to secure the two limbs A and A¹ together.
The limb A¹ can turn on the circular part c¹ of the nut C which may be secured
to the screw B by being locked against the shoulder formed by the enlarged part b',
or the extreme end of the part b² may be rivetted over the nut C. It will be seen
that by employing a right and left hand threaded screw the screw has little or no
tendency to become loose.
Instead of employing a headed screw B and a nut C as above described the head
may be dispensed with and two nuts C and C' employed with a headless screw B¹

page_text: (see Figs. 3* and 5*). The screw B¹ has a right hand b¹ and left hand b² screw
thread formed on it which may be of the same diameter, and the nuts C and C¹ are
respectively screwed on to each end thereof (see Fig. 3*) where, meeting together
they lock each other the limbs being free to turn on their circular parts c¹.
Instead of employing a headed screw B having both the right and left hand
threads outside and a nut C as hereinbefore described and illustrated by Figs. 3, 4,
5 and 6, the screw thread 6 may be inside thereof and another screw employed to
screw therein and secure the limbs together instead of the nut C. This modification
of our Invention is illustrated by Figs. 7, 8, 9 and 10 in which the same letters of
reference indicate the same parts. B is a headed screw having a right hand
outside screw thread 61 by which it is secured to the limb A and a left hand inside
screw thread 63 into which screws the shank d of the screw D and so secures the
limbs A and A¹ together, the limb A¹ being free to turn on the plain circular
part b of the screw B².
The head b of the screw B2 may be dispensed with and instead thereof a headless
screw B³ and a nut C may be employed with the inner screw D (see Figs. 7*
and 9*). The screw B³ has a right hand outside screw thread 61 on which is
screwed the nut C¹ and an inside left hand screw thread b³ in which is screwed the
shank d of the screw D. The limb A can turn on the part c¹ of the nut C and the
limb A can turn on the plain circular part 6' of the screw B³.
A further modification of our Invention consists in forming both the right hand
and the left hand screw threads inside the screw (see Figs. 11, 12 and 13) and
using therewith two screws one to screw into either end. E is a screw of tubular
form (shewn separately at Fig. 13) having a left hand screw thread e¹ formed in
one end thereof and a right hand screw thread e³ formed in the other end thereof.
Into the said screwed ends e¹, e² are screwed respectively the shanks d and d¹ of
the screws D and D¹ their heads securing the two limbs A and A¹ together one or
both of which latter can turn on the outside of the tubular screw E.
We do not limit ourselves to the form of the screw heads or nuts illustrated on
the drawing as they may be of various ordinary forms according to the class of
scissors, shears or other like cross limbed instruments to which they are applied
and the disposition of the screw threads may be reversed, that is to say, for
instance, the screw thread 6 of the screw B may be "left hand" instead of "right
hand as illustrated and the screw thread b³ may be "right hand” instead of
" left hand."
"
Our Invention can be applied to shears and other like cross limbed instruments
similarly as above described with reference to scissors.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed, we declare that what
we claim is
The new or improved joint screw for scissors, shears and other like cross limbed
instruments hereinbefore described and illustrated in the accompanying drawing, that
is to say, a screw or connection for the purposes described having a right hand and
a left hand screw thread formed upon or inside it one of such screw threaded parts
being screwed into, or otherwise connected to, one limb of the instrument and the
other screw threaded part being secured or connected to the other limb thereof
substantially as described and illustrated.
CHARLES BOSWORTH KETLEY,
128, Colmore Row, Birmingham,
Agent for the Applicants.
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