Improvements in or relating to Screw-keys or Spanners.
Year: 1897

page_text: I, JOHN WILLIAM CAWTHORNE, of Sykehouse, Snaith, R.S.O., in the County of
York, Farmer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in screw-keys or spanners used for, say,
screwing or unscrewing the nuts of bolts, set screws, and the like.
The object of this invention is to provide a screw-key or spanner that can be
readily adjusted to the varying sizes of, say, nuts or screw-heads, and which is
operated on the lever principle whereby the pressure can be brought to bear upon
a nut (or other object) without there being any liability to damage the corners
thereof.
According to this invention the main portion of the screw-key or spanner may
be made of any suitable material such as wrought iron or steel, of the requisite size
and thickness, somewhat in the form of, say, the letter T. The top horizontal
part which forms the fixed jaw may be made say at a right angle with one side of
the vertical stem, whilst the opposite side thereof may, if so desired, be arranged
at any suitable angle thereto. On the aforesaid vertical portion a suitably shaped mov-
ing jaw is made to slide, and its upper surface is made to correspond with the contour
of the under surface of the fixed jaw. In the before named vertical portion is
provided a series of holes for receiving the set screw or spring bolt, which forms
the pivot for the bifurcated cam lever which operates the sliding jaw.
The upper
end of the cam lever is arranged to work against the under surface of said jaw.
The sliding jaw is connected to the cam lever by means of one or more toggles or
links of suitable and convenient shape.
The herein described arrangement permits of its jaw on either side of the vertical
portion being used as a screw-key or spanner, which by means of the series of
holes in the vertical portion can be adjusted to various sizes of say nuts or screw-
heads.
1007
Improvements in or relating to Screw-keys or Spanners.
I, JOHN WILLIAM CAWTHORNE, of Sykehouse, Snaith, R.S.O., in the County of
York, Farmer, do hereby declare the nature of this invention and in what manner
[Price 8d.1

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
-
This invention relates to improvements in screw-keys or spanners used for say,
screwing or unscrewing the nuts of bolts, set screw, and the like.
The object of this invention is to provide a screw-key or spanner that can be
readily adjusted to the varying sizes of say, nuts or screw-heads, and which is
operated on the lever principle whereby the pressure can be brought to bear upon
a nut (or other object) without there being any, liability to damage the corners
thereof.
In the drawings annexed:-
Figs. 1 and 2 are respectively a side and end elevation of a screwkey with single
end constructed according to this invention with the jaws open.
Figs. 3 and 4 are respectively a side and end elevation of the same screwkey with
the
Jaws closed.
Fig. 5 a side elevation of the jaw portions of the screwkey shown at Fig. 1.
Fig. 6. an end elevation of the actuating lever of same.
Fig. 7 a part side elevation of a screw-key with double end, drawn with the
jaws closed.
Like parts in all the views are marked with the same letters of reference.
A is the main portion of the screwkey or spanner may be made of any suitable
material such as wrought or malleable iron or steel, of the requisite size and thick-
ness, somewhat in the form of, say, the letter L or T. The top horizontal part
which forms the fixed jaw A may be made either as shown, that is with the jaws
at rightangle to the vertical stem a¹ or with double ends as at Fig. 7, that is to
say, with one set of jaws at a right angle with one side of the vertical stem a¹
whilst the opposite side thereof may, if so desired, be arranged at any suitable
angle thereto. On the aforesaid vertical portion a¹ a suitably shaped moving
jaw B is made to slide freely thereon, and its upper surface is made to correspond
with the contour of the under surface of the fixed jaw A. In the before named
vertical portion or stem a¹ is provided a series of holes a³ for receiving the set
screw or spring bolt C which forms the pivot for the bifurcated cam lever D which
operates the sliding jaw B. The upper end of the lever D which forms the cam,
is arranged to work against the under surface of said jaw B. The sliding jaw B
is connected to the cam lever by means of one or more toggles or links E of suitable
and convenient shape.
In the drawings the link E is shown in a hook form screwed to the underside of
the sliding jaw B and to pass between the bifurcated portion of lever I where the
hook portion of the link E engages with a pin F which may also be employed
for binding the two jaws together. But if so desired the lower sliding jaw B may
be coupled to the cam lever D by the link E which is jointed to the said parts on
the outside thereof as at Fig. 7.
The herein described arrangement permits of its jaws on either side of the
vertical portion a¹ being used as a screwkey or spanner, which by means of the
series of holes in the vertical portion can be adjusted to various sizes of say nuts
or screw-heads.
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:-
A screw key or spanner capable of adjustment to varying sizes, say, of nuts,
consisting of a vertical stem, such as a perforated with a number of holes, and
armed with a head to form a fixed jaw, such a A on one or both sides of the said
stem, a loose jaw such as B arranged to correspond to the contour of the fixed
jaw A and to slide upon said stem, a cam lever such as D, adjustably mounted
upon the stem a¹ and pivotably fixed thereon by a set screw C and a hook or link,

page_text: such as E, for connecting the sliding jaw B to the cam lever D, all arranged and
combined substantially as herein described and illustrated in the accompanying
drawings.
Dated this 27th day of December 1897.
JOHN WILLIAM CAWTHORNE.