Improvements in Apparatus for Shearing Girders and the like.
Year: 1896

page_text: Date of Application, 10th July. 1896-Accepted, 22nd Aug., 1896
COMIDDIE DI DOITIATION.
Improvements in Apparatus for Shearing Girders and the like.
I, ARTHUR VERNET, of Dijon (Côte d'Or) in the Republic of France, Engineer,
do hereby declare the nature of this invention and in what manner the sanie is to be
performed to be particularly described and ascertained in and by the following
statement :-.
My invention relates to apparatus for shearing girders and the like, and I will
describe it with reference to the accompanying drawings, in which,
Figure 1 is a side elevation of a machine constructed in accordance with this
invention.
Figure 2 is a vertical section taken on the line A. B Figure 1.
Figure 3 is a part horizontal section taken on the line C. D, Figure 1.
Figures 4 and 5 shew respectively in elevation and in plan one of the moveable
tool-carriers and its operating mechanism.
The machine has two coupled cheeks the one (1) fixed and the other (2)
moveable. The outer contour of the latter is shewn by the dot and pick lines in
Figure 1. The fixed cheek 1 carries the horizontal shaft 3 to which movement of
rotation is given by means of the cranked fly wheel 4 through a set of two speed
gear.
On the shaft 3 are secured two bevel pinions 5, 6, engaging with bevel toothed
wheels 7, 8 which through the pinions 9, 10, transmit movement to the toothed
wheels 11, 12, mounted on the shafts 13, 14, carrying pinions 15, 16, which
engage with racks 17, 18, centered to the projections 19, 2) on the moveable
cheek 2.
.
The pinion 15 (Figure 1) is provided with a projection 21 capable of engaging
with a notch 22 in the rack 17 so as to produce the displacement of the moveable
cheek 2 in order to finish the shearing operation.
The cheek 2 is guided in its movement in relation to the check 1 by bolts 23, 24,
on the one cheek engaging in arc shaped slots in the other cheek and each cheek
is pierced by a large opening between the vertical edges 25, 25, of which slide two
cutter-heads 26, 26, one of which is shewn separately and on a larger scale in
Figures 4 and 5. Each cutter head is furnished with a horizontal blade 27 for
shearing the flanges of the girder or the like from the outer sides and with a blade 28
moving vertically and serving to shear the body or rib of the girder or the like
and the flanges from their inner sides.
The displacement of the blade 28 in relation to the cutter-head is obtained by
operating the handle 29 on a vertical shaft 30 provided at its end with a helical
cam 31 which engages in a groove of the saine shape in the movable piece 32
carrying the blade 28.
The two cutter-heads joined to each of the checks 1 and 2 are moved from or
brought towards one another (according to the height of the girder or the like to
be cut) by means of the screw threaded rods 33, 33 working in nuts 34 actuated by
the toothed wheels 35 through the crank 36.
In order to shear an I shaped girder it is first passed into the openings in the
cheeks 1 and 2 and then the outer faces of the two flanges are firmly gripped
between the blades 27 by operating the crank 36 to bring the cutter-heads towards
each other. When this has been done the handles 29 are successively turned in
order to bring the four blades 28 into contact with the inner surfaces of the flanges
and so the girder is held between the blades 27 and 28 in the manner shewn in

page_text: Figure 1. On turning the fly-wheel 4 the shafts, 13 and 14 rotate and the moveable
cheek 2 turns on the fixed cheek 1 and shears the girder by torsion. At the end
of the movement the cam 21 engages in the notch 22 of the rack 17 and the effect
of this is to impart to the movable cheek 2 a slight displacement relatively to the
fixed cheek 1 and to consequently shear the body or rib of the girder which was
incompletely cut by the rotatory movement of the movable cheek.
I do not limit myself strictly to the precise details described and shewn as it
will be evident that they may be varied without departing from the nature of my
invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
An apparatus for shearing girders and the like, the said apparatus having in
combination two cheeks, the one fixed, and the other movable and both provided
with blades capable of being operated so as to grasp between them the girder or
the like to be sheared, the shearing of which is effected by power transmitted
through suitable gearing for turning the movable cheek relatively to the fixed
cheek and then giving to the movable cheek a further movement as described for
effecting the shearing of the body or rib of the girder substantially as hereinbefore
described with reference to the accompanying drawings.
Dated this 10th day of July 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.