Improvements in Apparatus for Shearing Bars of T, I, and similar Sections.
Year: 1896

page_text: Date of Application, 28th Sept., 1896-Accepted, 5th Dec., 1896
COMPLETE SPECIFICATION.
Improvements in Apparatus for Shearing Bars of T, I, and similar
Sections.
I, WILHELM SCHULZE of Cöthen in the Duchy of Anhalt, German Empire,
Merchant, 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 :-
My present invention relates to machine-tools for cutting off iron bars of T, I and
similar sections and consists in an arrangement of two auxiliary side blades or cutters
each adapted to fit into one of the two angular spaces which are formed by the flange
and the web of the bar so as to touch the surfaces of both parts and to support the
bar during the cutting operation. These side blades are pivoted to the franie at such
points, that the pressure exerted on the bar by pressing the main blade or cutter
against the outer surface of the flange not only forces the side blades into the flange
from its inner side but forces them into the web. If a I-iron is to be cut, the shears
are first made to operate on one T and the bar is reversed for the other T to be cut.
In the annexed drawings
Fig. 1 is a front view of a machine-tool constructed according to my invention for
cutting bars of T, I and similar sections,
Fig. 2 is a horizontal section on line 2-2 in Fig. 1,
Fig. 3 shows in a vertical section on line 3-3 in Fig. 4 the operating device of the
machine,
Fig. 4 is a horizontal section on line 4-4 in Fig. 3.
Fig. 5 is a horizontal section through the side cutters on line 5-5 in Fig. 6.
Fig. 6 is a vertical section through the main cutter and one of the side cutters on
line 6-6 in Fig. 5.
The frame of the machine consists of two plates p, which are connected by
stays b. An aperture p' in either plate allows the bar to be introduced, the bar being
represented as of I section having two flanges t¹, t' and a web t. A cross-piece q in
the lower part of the aperture may serve as a support for facilitating the introduction
and the reversal of the I bar. The angular side blades or cutters e, e¹ form the ends
of arms e, e, which are pivoted to the frame at c c¹. As will be seen from the
drawings, the pivot of either side blade is situated beneath and outwardly from the
angular cutting edges of the blade when in operative position, so that botli blades by
a downwardly directed pressure on their upper edges will be directed towards each
other so as to cut the web t from both sides. For moving the side blades into and
out of their working position, their arms eo, eo are connected by links a, s¹ with
hand-levers 1, pivoted to the frame at 1°, 1º.
The main blade or cutter a is by means of its stem al vertically guided between a
pair of flanges of two angular bars vo, the other flanges of which are rivetted to one
of the plates p, whilst two flat bars to, to rivetted to the other. plate p prevent the
guiding flanges from being bent outwardly. The blade a is pressed down by the
action of a cam d shown as an excentric disk which is arranged on a short shaft f
mounted in the plates p. The cam d may press directly on the stem a' of the blade a,
but it will be of advantage to arrange both at such a distance that a wedge k with a
handle may be interposed. In this case when the blades have been operated the
blade a may be raised-for which purpose a rod m is connected with the stem a' of

page_text: the blade and adapted to be managed by means of a hand lever i pivoted to the frame
at without previously lifting the levers h, as soon as the intermediate wedge k has
been removed. Moreover the I bar may be more easily introduced into the machine
and reversed therein, if a greater space between the main blade and the side blades
is provided for than is required by the thickness of the flanges t'.
The cam d may be operated by any suitable means. In the construction shown
two levers h, h provided with handles g¹ g¹ are for this purpose secured to the ends
of the shaft and immovably connected to each other by a rod g, which carries
two rocking brackets u, u provided with handles u°, u° and ratchet dogs r, and
embracing racks z, z. Of these racks z¹ is pivoted to the frame at o and provided at
its lower part with a footstep 2 by means of which it may be swung outwardly to
engage the dog r¹. The rack which is adapted to engage the dog r is pivotally
connected at of or o with a hand lever ¹ pivoted to the frame at a suitable point, for
instance as shown at the same point o, where the rack a¹ is fulcrumed. The pitch of
rack z is smaller than that of rack z.
The operation of the mechanism for moving the cam d is as follows. By pressing.
down the lever h', the rack is lowered and as it is connected by means of dog r,
bracket u, rod g and levers h, h with shaft f, the cam d on this shaft is turned over
an angle corresponding to the downward stroke of the lever ' towards the wedge k
so as to operate the cutting blades. During this movement the dog slides down-
ward over the teeth of the rack and engages this rack at the end of the movement.
This engagement inay be secured by using the foot step 20, whilst the lever his
raised for another stroke and the teeth of the rack z slide over the dog r, the
rocking bracket u swinging slightly upwardly to allow this sliding movement.
Having now particularly described the nature of this invention and in what
manner the same is to be performed, I declare that what I claim is :-
1. In combination in a machine for cutting bars of T, I, and similar sections, a
pair of side blades or cutters arranged to fit into the corners of the bar and against
the web and flange forming said corners, a main blade or cutter operating on the
outer face of said flange against which the side blades or cutters bear and means
for operating the main blade or cutter, said side blades or cutters being pivoted to
press towards each other under the thrust of the main blade or cutter, substantially
as described.
2. In combination in a machine for cutting bars of T, I, and similar sections, a
pair of side blades or cutters arranged to fit into the corners formed by the flange
and web, said blades or cutters extending upwardly and inwardly from their pivot
points to support the bar, and a main blade or cutter with means for operating the
same vertically towards the pair of side blades or cutters, said side blades or cutters
being adapted to be pressed inward under the thrust of the main blade or cutter,
substantially as described.
100
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.