IMPROVEMENTS IN SHEARING AND CLIPPING APPARATUS
Year: 1870

page_text: LETTERS PATENT to George Twigg, of Birmingham, in the County
of Warwick, Manufacturer, for the. Invention of "IMPROVEMENTS IN
SHEARING AND CLIPPING APPARATUS."
Scaled the 26th April 1870, and dated the 16th February 1870.
COMPLETE SPECIFICATION filed by the said George Twigg at the
Office of the Commissioners of Patents, with his Petition and De-
claration, on the 16th February 1870, pursuant to the 9th Section
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
TWIGG, of Birmingham, in the County of Warwick, Manufacturer, do
hereby declare the nature of my said Invention for "IMPROVEMENTS IN
SHEARING AND CLIPPING APPARATUS," and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, reference being had to the Drawings
hereunto annexed, and the letters and figures marked' thereon, that
is to say:-
My Invention more particularly refers to the description of shearing
or clipping apparatus used for shearing or clipping horses and other

page_text: animals or for similar or other purposes for which such apparatus may
be applicable, such as clipping grass, and consisting of a pair of metal
plates working upon each other by means of leverage, the cutting edges
being formed with a series of small blades or shears and operating after
the manner of scissors.
My improvements refer to the arrangement and construction of the
actuating or leverage parts of such apparatus, and have for their object
greater facility and accuracy in working the cutters or shears, increased
strength and rigidity of the moving parts, with less tendency for such
nants to become lease i..
.!
edge view of one form of my improved shearing or clipping apparatus,
Figures 3, 4, and 5 shewing detached portions of the same.
(a) is a carrier plate, secured to or forming part of the handle (6), and
provided with a strip of hard metal (a) for the purpose of resisting the
wear upon the parts; (6¹) is the actuating or lever handle working upon
the pin (c), shewn more clearly in Figure 3, and giving a horizontal
to-and-fro motion to the inner cutter plate (d), which is pierced, as shewn
in Figure 4, at (e) to receive the stud button (ƒ), the part (ƒ¹) of such
stud button fitting into the slot (g) of the lever handle (6¹), by means of
which the cutter plate (d) will be moved a sufficient distance to the right
or left in the operation of shearing or clipping, such movement being
regulated by the carrier plate (a), being formed with a recessed part (a²)
for the head of the lever handle (¹) to work in, or the head of the lever
handle may work between suitable raised stop pieces or blocks. The back
shearing plate (h) is secured by screw pins (i) to the carrier plate (a) and
is thus rigid with it. Figure 5 is a view of the inner face of the back
cutter plate (7) shewing the screw holes and studs (k) fitting into
corresponding recesses in the carrier plate (a), and thus increasing the
security of the parts. (1) is a groové cut upon the face of both the
cutter plates, and formed to receive a length of wire (1¹) or an angular
bar of metal, which acts as a set-up for the purpose of keeping the inner
surfaces of the small blades or shears in close contact with each other;
and also acting as a guide for ensuring the parallelism of the cutter
plates during the operation of shearing or clipping, or if preferred the
one cutter plate may have a set-up formed upon it to fit into a groove
cut-in the other shearing plate.

page_text: Another form of my improved shearing or clipping apparatus is shewn
in front and edge views, Figures 6 and 7, Figures 8, 9, 10, and 11 being
detached views of parts of such apparatus; in this arrangement both the
handles (a) and (a¹) work freely upon a centre (b) with a scissors joint
and action.
Figures 8 and 9 represent the inner face of the cutter or shearing
plates (c) and (d), which are formed with recessed parts (e) and
studs (e¹) so as to receive the arms (✓) of the handles (a) and (a¹),
Figure 10 shewing the scissor joint and centre (6), the arms (ƒ), and
also a small spring (g), which will have a constant tendency to keep the
handles extended.
Figure 11 shews in under side and edge views a securing bolt or
bar (h) formed with projections and studs (¹) and (²), the projecting
parts () working in the guide slots (i) of the top cutter plate (c),
Figure 8. The shearing plates (c) and (d) are secured by means of screw
pins passing through the projections of the bolt or bar (h) at (k), and
the back shearing plate (d) at (1), the studs (2) of the securing bolt or
bar fitting into recesses (m) in the back plate.
Or the connection of the shearing plates may be effected as shewn-in
section, Figure 12, by means of a T piece (n). fitted within suitably
formed grooves in the shearing plates, the securing of the parts being
effected by means of screws (o).
Again, as shewn in Figure 13, I connect the two lever handles (a)
and (a) at (b), and attach the handle (a) to the back shearing plate (c)
and the handle (a) to the top shearing plate (d) by means of screw
pins (e) screwing into the plates, the handles working upon such pins
and imparting a horizontal to-and-fro movement to the shearing plates,
the parallelism being maintained by means of the set-up or guide (ƒ).
I sometimes purpose using with this description of shearing or clipping
apparatus a carrier plate similar to (a), Figure 1; in Figure 13 are
shewn the screw holes and studs for attaching the same.
;
Or, as shewn in Figure 14, I connect the handles (a, a',) by means of
a knuckle joint at (6), and attach the arm (c) of the handle (a) to the
back shearing plate (d), and the arm (e) of the handle (a') to the front
shearing plate (f). (g) is a connecting bar for securing the parts by
means of screw pins (h) passing through slots in the front plate, and
screwing into the back plate.