Improvements connected with the Standards of Plate Shears, and in Means for Opening the Severed Parts for Guiding the Plates as Cut.
Year: 1897

page_text: Date of Application 26th Feb., 1897-Accepted, 22nd May, 1897
COMPLETE SPECIFICATION.
Improvements connected with the Standards of Plate Shears, and
in Means for Opening the Severed Parts for Guiding the Plates
as Cut.
I, JOHN THOMAS GODFREY, of 80 Industry Road, Darnali, Yorkshire,
Engineer, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement :-
.
f
This invention has for object, certain improvements connected with the standards
of plate shears and in means for keeping the severed parts of the plate apart.
This invention relates to shearing machines in which the shear blades are in line
with the body of the shear standard in order to facilitate the cutting of large plates
through the middle or any part by a series of cuts.
In order to accomplish this, the shear stand is made with a gap immediately
behind the shears. Behind this gap, the shear standard is so formed that the
plate on one side is guided downwards, and on the other side travels horizontally,
further the standard is so shaped that on the side of that part of the plate, which
goes downwards, it diverges from the 'centre line say to the left and passes under
that part of the standard over which the other part of the plate being cut moves
horizontally, the standard on the other side diverges horizontally from the centre
line and overlies that part of the standard on which the plate moves downwardly.
By this means, the plate is prevented from binding on the casting of the standard
and allows room for the horizontal manipulation of the plate while being cut.
:
In order that the part of the plate as severed may be deflected downwards
I provide the machine with a ram actuated by a spiral spring running along the
side of the standard which acts in such a fashion that during each cut as the one
part of the plate is pressed downwards the head of the ram is thrust well home
between the plates and as the plate is advanced for a fresh cut the spring is
compressed ready to ram the head home again during the next cut.
When cutting off narrow strips which are apt to curl downwards during the
cutting so far as to reach the ground and prevent the further progress of the
plate, I fix a removable block under the upper blade. The upper surface of this
block runs parallel to the cutting edge of the upper blade and sufficiently below it
that the thickest plate to be cut will not bind between the blade and the block.
The strip will curl slightly during the cutting but before the finish of the cut it is
straightened by the pressure to which it is submitted between the blade and the
block.
:
I prefer to make this block removable to facilitate the withdrawal of a plate
which may only be cut through partly.
To carry this invention into practice, the standard (or casting) is prepared with
an undercut cheek at one side leading downwardly to the rear, said undercut cheek
commencing from the back of a gap directly behind the shear blades, and in
addition the body of the standard from this cheek diverges to the left rearwardly.
As the plate is being partly severed, one part is guided downwards by this
cheek, at the same time, from the side formation of the body of the standard under
the cheek, the plate as severed does not bind on the standard.
The other side of the standard from the gap to the rear forms a table on which

page_text: the right rearwardly.
The cutting blade or shear blade is operated by an eccentric, a knuckle, or other
appliance for effecting its necessary up and down motion from within the head of
the standard, and the inner face of the blade works next a fixed steel edge piece or
lower blade secured in the top of the under jaw of the foundation.
The invention will be fully understood by reference to the annexed drawings.
Figure 1 is a plan.
Figure 2 is a side elevation.
Figure 2 section through line. x. x Figure 2.
Figure 3 is an end elevation..
Figure 4 shows details of ram head.
Figure 5 shows the spring and ram.
A is the foundation. Cis the inclined cheek under which one part of the plate
passes. Dis the table on which the other part of the plate being cut passes.
The dotted line c Figure 1 shows the radial direction of the downwardly
inclined cheek C and the full line d the radial direction of the horizontal table D.
E is the head of the casting containing sliding block E. F is the shear blade
attached thereto. G is the eccentric on the shaft G¹ for operating E. H is the
knuckle joint for giving the requisite pressure. by following the motion of the
'eccentric.
I is the under part of the casting to which the lower shear blade is fixed.
J is the ram on the rod K kept in position within the slit by the guide eyes L.
M is the spiral spring which keeps the ram. head J thrust forward as the severed
plate opens out.
Nis-the affixable block on the side of the casting for use when cutting narrow
strips.
Pis the gap between the shear blades and the casting...
Qand Rare the severed parts of the plate S being.cut.
Having now particularly described and ascertained the nature of this inven-
tion and, in what manner the same is to be performed I declare, that what I
claim is :-
.
1. In a shearing machine in which the shear blades are in line with the main
casting a gap P behind the shears F I from which on one side of the standard where
the table D commences the back wall gradually diverges to the right rearwardly
as at d the other side of the standard having its side wall diverging to the left
from the gap to rear as at c and underlaying the former, said side wall being.
supplemented by the cheek C at an incline as shown.
2. A ram actuated by a spring for the purpose of keeping the sheared parts of
the plate from closing together.
3. A block fixed on the casting under the upper shear for preventing the
downwardly inclined strips from curling.
Dated GIS 40TH UBY UL NeoĽUBTY TOM
LEU GITS 40TH UBY UL NEUTUKTY TONI
H. GARDNER,
Patent Agent, 166 Fleet Street, London;
Agent for the said J. T."Godfrey.