Improvements in Plate-shears, Monkey-wrenches, Tongs, and the like.
Year: 1898

page_text: Date of Application, 24th Jan., 1898-Accepted, 5th Mar.,
1898
COMPLETE SPECIFICATION.
Improvements in Plate-shears, Monkey-wrenches, Tongs, and the
like.
I, THOMAS JENSEN, of Arendal, in the Kingdom of Norway, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to improvements in plate-shears, monkey-wrenches, tongs
and similar tools, whereby their construction is simplified and their power consider-
ably increased while the tools can be handled just as easily if not more easily
than shears, tongs or monkey-wrenches as hitherto constructed.
In the accompanying drawing:
Figure 1 is an elevation of a pair of plate-shears;
Figure 2 is a side view of the same:
Figure 3 is an elevation of a monkey-wrench:
Figure 4 is a side view of the same:
Figure 5 is an elevation of a modified form of monkey-wrench:
Figure 6 is an elevation of a pair of tongs.
The arrangement for multiplying power which is characteristic of this inven-
tion, is substantially the same in all three of the tools named and consists in the
first place of a lever a, which is bent more or less to an angle or curve. This lever
has one of its ends furnished with two pins 6, 61, or these pins may be formed by
the lever itself and are placed a certain distance apart, each being connected
pivotwise with its respective limb of the tool.
For example as shown in the plate-shears figures 1 and 2, the pin b forms the
pivot for the lever a on the limbe of the shears while the pin 61 forms the pivot
for the lever a on the other limb c¹ in a piece d which preferably is secured to the
limb c¹, as shown in Figure 1. e, el are the jaws of the shears, that form the outer
ends of the limbs c, c¹ which are connected pivotwise at their other end by a bolt f
so as to give the jaws a cutting movement. By moving the lever a alternately
forwards and backwards, while the limbs of the shears are held in the hand or one
of the limbs is suitably secured, the shears will be caused to cut, and according
to the rule respecting a power and its leverage it will be understood that an
exceedingly powerful effect can be exercised by the jaws e, e¹ by applying a com-
paratively small force to the outer end of the lever a. Of course the longer this
lever a is, the greater is the multiplication of the power. With regard to the
shears, the jaws e, e¹ may be made comparatively thin as the point around which
the jaws e, el turn is not placed at the root of the jaws but at a long distance there-
from as shown at f. An advantage of this arrangement is that, while the shears
are cutting, one part of the plate is prevented from being bent up and the other
down. Also the edges of the plate are prevented from being deformed.
In the monkey-wrench, shown in Figures 3 and 4, the jaws e, el form flat surfaces
and in order to cause the jaws to grip the nut with their flat surfaces parallel to
each other, one limb c is allowed to slide along the other limb c¹ as the pin f on
the limb c works in a slot g in the other limb c. The lever a may be provided