Year: 1888

page_text: I, GEORGE PORTER, of No. 23, Cullum Street, in the city of London, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to tongs or spanners of the class described in the Provisional
Specification filed with my application for Letters Patent dated the 28th January
1888 No. 1345.
The object of my said invention is to provide improved means for adjusting the
jaws of such tongs or spanners relative to each other and locking the legs in the
required position when so adjusted.
According to my said invention I form a series of holes in one leg of the spanner
adapted to receive the pivot pin or stud on the other leg of the spanner. On the leg
having the series of holes I arrange a plate having a similar series of holes and adapted
to slide on the said leg. The holes in the sliding plate are connected by slots whereby
a series of projections are formed which after the two legs have been placed together
will enter a groove formed in the pivot when the sliding plate is moved. Set screws
or other means are provided for securing the sliding plate.
Instead of connecting the hole in the sliding plate by slots I sometimes employ two
sliding plates which when moved are adapted to engage with the groove in the pivot
on opposite sides.
In some cases I provide one leg of the tongs with a pin or stud which will limit
the opening of the legs.
Instead of using the above named sliding plate or plates I sometimes screw-thread
the pivot and fix the legs of the tongs together by means of a nut screwing on the
said pivot or I employ a spring nut adapted to catch onto the pivot.
:
Dated the 18th day of April 1888.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.

page_text: 1, GEORGE PORTER, of No. 23, Cullum Street, in the City of London, 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:
My invention relates to tongs or spanners of that class having two pawls or
legs connected together and adapted to be moved relatively to each other in order
to effect the adjustment of the tool.
My improvements consist essentially in providing a series of holes in one leg of
the spanner adapted to fit the pivot pin or stud on the other leg of the spanner,
and in arranging in combination with such holes a sliding plate or plates, which..
when moved, is or are adapted to engage with a groove or recess formed in the
said pivot pin to prevent the two legs from becoming detached.
My improvements are illustrated in the accompanying drawing, in which
Figure 1 is an elevation of a spanner showing the legs locked together.
Figure 2 is a view similar to figure
allowing the two legs to be detached.
but showing the sliding plate in position for
Figures 3 and 4 are side and edge elevations, respectively of the leg of the,
spanner provided with the pivot, and
Figures 5 and 6 are similar views of the other leg.
Figure 7 is a view similar to figure 5 showing the sliding plate in its locking.
position, and
Figure 8 is a view of the sliding plate detached.
Figures, 9 and 10 are views illustrating a modification.
a, bare the two legs of the spanner having the jaws a¹,
respectively; e is
the pivot attached to the leg a and having the groove d, and e is the sliding
plate working upon the leg and adapted to be fixed in the required position by
set screws f,f
g, g are a number of holes formed in the plate é and corresponding with the
holes h, in the leg b into one or other of which the pivot c is introduced
according to the distance required between the jaws. The holes g, g are connected
by slots i, i to form projections j, j
In operation the holes g, are adapted, to, coincide as shown in figures 2.and.5.
and after the pivot has been placed in the required hole the plate, e is moved to
the position shown in figures 1 and 7 so that the projections are caused to enter
the grooved in the pivot, whereby the legs are locked together. k is a screw
stud which is introduced into the leg a near the pivot and which when the
two legs are placed together enters the hole next to that in which the pivot is
located. The said screw stud then serves to limit the movement of the two legs
relatively to each other, thus facilitating-the-handling of the tool.

page_text: I sometimes employ two plates e, e placed one upon the other, as shown in
figures 9 and 10, in this case, however, the holes y, y are not connected by the
slots i, i, the locking being effected by moving the plate e in one direction so that
the edge e of one hole enters one side of the groove d and the other plate e¹ in
the opposite direction so that the edge of one of its holes enters the opposite
side of the groove d.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
:-
(1). In tongs or spanners, one leg of which has a series of holes adapted to
receive a pivot on the other leg, the employment of a sliding plate having projections
which enter a groove in the said pivot, substantially as described with reference to
figures 1 to 8 of the accompanying drawing.
(2) The modification of my invention wherein I employ two sliding plates
arranged one upon the other, substantially as described with reference to figures 9
and 10 of the accompanying drawing.
(3). The manufacture and use of the improved tongs or spanners hereinbefore
described and illustrated in the accompanying drawing.
Dated the 11th day of Januar 1980
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.