Improved Nippers for Closing Metallic Rings upon Rubber Tubing in Order to Secure the Tubing upon Metallic Connections, the Tool being applicable for other purposes.
Year: 1899

page_text: Date of Application, 24th Feb., 1899
Complete Specification Left, 21st Nov., 1899-Accepted, 6th Jan., 1900
PRUVINIUNAL SPECIFICATION.
Improved Nippers for Closing Metallic Rings upon Rubber Tubing in
Order to Secure the Tubing upon Metallic Connections, the Tool
being applicable for other purposes.
I, WILLIAM DEWAR, of 11, Garnet Terrace, Mount Florida, in the City of
Glasgow, Engineer, do hereby declare the nature of this invention to be as
follows:-
The parts of the improved tool are hereinafter particularly specified and the
tool will be described in its application to the closing of metallic rings upon
rubber tubing so as to prevent the escape of steam, water, or gases, although its
adaptation to other purposes is manifest.
The tool consists essentially of a die case, made in two portions hinged together
at the top and formed each at their other ends as a hand lever or grip. The
adjacent edges of the die case have at one part approximately semi-circular
recesses formed in them for the reception of the metallic closing ring the lower
portions of these edges being parallel to each other. Within recesses in the die
case two jaws or dies are carried, one in each portion of the case, which dies
are actuated by levers connecting the hand grips and dies simultaneously with
or a little later than the closing of the die case after the tool has been placed in
position to embrace the metallic ring. These dies act to squeeze up the clos-
ing ring in such a manner as to send all the surplus metal in loop form towards
two, three or more recesses between the pressure dies where it is acted upon and
squeezed into closed loop form.
The action is as follows -The two parts of the die case are opened suffi-
ciently to permit of the dies embracing the ring and are then brought together
by the action of the hand levers or grips, the hand levers causing the forward
movement of the sliding jaws or dies simultaneously, which latter squeeze up
the ring upon the tubing to send the surplus metal into the various recesses in
the dies.
The dies can be readily extracted and others of different size substituted when
desired.
The present invention is intended particularly to overcome the difficulties
experienced in closing rubber upon metallic connections by means of twisted
wire, which wire was unsatisfactory because of the frequent breakages occurring
during the twisting process, and the weakening of the wire by such twisting
rendering it liable to break at the neck upon increase of resistance to such
closing.
Dated this 23rd day of February 1899.

page_text: Improved Nippers for Closing Metallic Rings upon Rubber Tubing in
Order to Secure the Tubing upon Metallic Connections, the Tool
being applicable for other purposes.
I, WILLIAM DEWAR, of 11, Garnet Terrace, Mount Florida, in the City of
Glasgow, 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:-
The parts of the improved tool are hereinafter particularly specified in respect
to the several figures of the annexed drawing, and the tool will be described
in its application to the closing of metallic rings upon rubber tubing so as to
prevent the escape of steam, water, or gases, although its adaptation to other
purposes is manifest.
Fig. 1 is a front view of one form of the nippers, with the cover removed, so
as to show clearly the internal mechanism. Fig. 2 is a similar view of a slightly
different form in which the two portions forming the lower portion of_the_die
engage each other with teeth like projections to ensure their advancement.simul-
taneously. Figs. 3 and 4 are views, shewing the nippers partly open and fully
closed, of another modified form in which the arms for advancing the lower dies
are geared together for the purpose already specified, and Fig. 5 is a view of
yet another form in which the arms which advance the dies are coupled together
by additional lever arms to ensure their simultaneous action.
In all the modifications illustrated or referred to, the tool consists essentially
of a die case, made in two portions A, A, hinged together at the top and formed
each at their other ends as a hand lever or grip B, B. The adjacent edges of
the die case have at one part recesses C, C, formed in them for the reception of
the metallic closing ring, each of these recesses being approximately a quarter
of a circle and constituting the upper set of dies. Within recesses E, E, in
the die case, two jaws or dies D. D, are carried, one in each portion of the case,
which dies have a motion towards the recessed portions C, C, of the die case com-
municated to them by levers K connected to the hand grips B and acting on the
dies as shown by the several figures of the drawing, these lower dies D, D₁, being
advanced as shewn at Fig. 5, by means of the arrangement of levers K and L,
or a little later or earlier as is permissible in the modifications shewn by Figures 1
to 4 inclusive, after the tool has been placed in position to embrace the metallic
ring. These dies D, D, act to squeeze up the closing ring in such a manner as
to send all the surplus metal in loop form towards two, three or more recesses F, F
F, F, between the pressure dies D, D, and recessed portions C of the die case
where it is acted upon and squeezed into closed loop form. The dies D, D, are
guided in their path by the sides of the recesses E formed in the portions A, A,
of the die case and also when desired by means of pins G, G, which enter
slots H, H, in the dies D, D, as shewn at Figs. 1 and 2, the dies D, D, being
normally held at their position furthest from the recessed portions C, C, by
means of springs I, I, inserted from the upper end of the portions A, A, of the
die case, and bearing against stop pins J, J, as shewn at Figs. 1 to 4, or as shewn
at Fig. 5, and also against extensions on the dies D, D.
The action is as follows:--The two parts A, A, of the die case are opened suffi-
ciently to permit of the dies C, C, D. D, embracing the ring and are then brought
together by the action of the hand levers or grips B, the closing of the hand
levers causing the forward movement of the sliding jaws or dies simultaneously,
as shewn at Fig. 5, or these may be operated separately, as in the modifications

page_text: shewn at Figs. 1 to 4, the dies squeezing up the ring upon the tubing_in_such
a manner as to send the surplus metal into the various recesses F, F, F, F,
between the dies.
The dies can be readily extracted and others of different size substituted
when desired, Fig. 2 shewing how this is possible.
The present invention is intended particularly to overcome the difficulties
experienced in closing rubber upon metallic connections by means of twisted
wire, which wire was unsatisfactory because of the frequent breakages occurring
during the twisting process, and the weakening of the wire by such twisting
rendering it liable to break at the neck upon increase of resistance to such
closing.
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:-
1. Nippers for closing metallic rings upon rubber tubing constructed substan-
tially as described.
2. Nippers for closing metallic rings upon rubber tubing, comprising a pair
of hand grips hinged at the top and carrying dies in combination with sliding
dies advanced by the action of lever arms during the closing of the hand grips
in order to send the surplus metal-into the recesses between the dies substan-
tially as described.
Dated this 20th day of November 1899.