IMPROVEMENTS IN GRIPPING JAWS FOR LATHES AND OTHER TOOLS
Year: 1885

page_text: I WILLIAM MACILWRAITH, of 4 Anglesea Street in the City of Cork, Engineer,
do hereby declare the nature of my Invention for IMPROVEMENTS IN GRIPPING
JAWS FOR LATHES AND OTHER TOOLS, to be as follows:-
My improved Gripping Jaw consists of a flat sole plate from the underside of
which projects a screwed stud or bolt, which passes through the face plate of the
Lathe or the work table of the operating tool.
This stud or bolt is furnished with a nut which holds the sole plate firmly to the
face plate or the work table in the usual manner. As a further security against
the sole plate moving, one or more pointed projections are made on its underside
and which take into corresponding holes made for them in the face plate or work
table.
The upper side of the sole plate is furnished with a nut having a hole with a
screw thread and fixed midway of the breadth and at the extreme end of the sole
plate. Concentric with the axis of this nut a portion of the metal of the upper
side of the sole plate is cut away, leaving a trough in the direction of its length to
form a slide.
The Gripping Jaw has a portion of its underside made to a corresponding section
and fits in the slide, it is also made with a recess in which the nut of the sole
plate can traverse.
A screw passes through the front of the Gripping Jaw and works in the nut of
the sole plate.
Collars are pinned on to the screw at each end of the recess in the Gripping Jaw
to act as abutments, whilst the front end of the screw is made with a square t▸
receive a box spanner by which it can be rotated and the Gripping Jaw traversed
to and fro on the sole plate.
The back end of the Gripping Jaw extends downwards so as just to clear the
bottom of the sole plate and grip any thin object; at its other end a flange or rib
projects outwards and which can be used for gripping either external or internal
objects.

page_text: I WILLIAM MACILWRAITH of No 4 Anglesea Street in the City of Cork, Engineer
do hereby declare the nature of my said Invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement, that is to say :-
In the accompanying sheet of Drawings Figure 1 represents a longitudinal
section Figure 2 an end elevation, and Figure 3 a plan of my improved grip-
ping jaw.
It consists of a flat sole plate A, which is secured to the face plate of the latlic
or the work table of the operating tool either by the central stud bolt B, or by
side bolts, which pass through the holes b b provided for that purpose. As a
further security against the sole plate moving, one or more pointed projections C
are made on the under side, and which engage with corresponding holes made for
them in the face plate of the lathe, or the work table of the operating tool.
The upper side of the sole plate A is provided with a nut D, having a hole with
a screw thread and fixed midway of the breadth and at the extremo end of the sole
plate A. Concentric with the axis of the nut D a portion of the metal of the
upper side of the sole plate A is cut away as shown at E, leaving a trough in the
direction of its length to form a slide. The gripping jaw F has a portion of its
under side made to a corresponding section at fand fits into the slide E; it is also
made with a recess d in which the nut D of the sole plate A can traverse. A
screw G passes through the front of the gripping jaw F and works in the nut D of
the sole plate A. Collars g and g' are pinned on to the screw G at each end of the
recess d of the gripping jaw F to act as abutments, whilst the front end of the
screw G is made with a square to receive a box spanner by which it can be
rotated and the gripping jaw traversed to and fro one the sole plate.
The back end of the gripping jaw extends downwards at F so as just to clear
the bottom of the sole plate A and thus grip any thin object, and at its other
end is a flange or rib F projecting upwards and which can be used for gripping
either external or internal objects.
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
The construction of gripping jaws substantially as described above and shown in
Figures 1, 2 and 3 or any mere modification thereof.