IMPROVEMENTS IN SUIFTING SPANNERS
Year: 1877

page_text: LETTERS PATENT to Arthur William Singer, of Coventry, in the County of
Warwick, for the Invention of "IMPROVEMENTS IN SUIFTING SPANNERS."
Sealed the 22nd September 1877. and dated the 26th March 1877.
PROVISIONAL SPECIFICATION left by the said Arthur William Singer at
the Office of the Commissioners of Patents on the 26th March 1877.
ARTHUR WILLIAM SINGER, of Coventry, in the County of Warwick.
MENTS IN SHIFTING SPANNERS."
"
IMPROVE-
This Invention refers to shifting spanners, which, according to my Invention, by
screw adjustment, may be made available for any nut or head within the largest
size of the said tool.
The tool is made with a four-sided aperture, within which an adjustable key
piece can be moved up or down in order to regulate the size of the aperture, and
so to adjust it to the size of the nut or head.
The two inner opposite sides of the aperture are V shaped, corresponding with
that of the adjustable key or of other convenient shape, so that one may freely
slide in or on the other, and be properly held or guided.
The key may be moved up or down by means of a screw fitted to the key, which
is moved by means of a nut having milled edge and working in a slot in the
handle.
Other means may be adopted for moving the key piece, such for example, as by
forming the handle with screw thread working through one side of the spanner and
attached to the key, but so as to turn therein.
The shape of the spanner may of course be varied, the essential feature in the
Invention being the construction of a spanner having an adjustable piece within it,
capable of being adjusted to suit the head of any nut or head of the size of and
smaller than the largest size of the spanner, the said piece or key being adjustable
by means of a screw.
By making spanners according to this Invention they will not spread at the jaws
when great strain is applied, the sliding bar being supported in the centre and not
at the side, as in spanners of the ordinary construction, at the same time the sides

page_text: of the aperture being supported on all sides, it is next to impossible for the spanner
to slip off the nut however great the strain applied may be.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Arthur William Singer in the Great Seal Patent Office on the
26th September 1877.
ARTHUR WILLIAM SINGER, of Coventry, in the County of Warwick. "IMPROVE-
MENTS IN SHIFTING SPANNERS."
This Invention refers to shifting spanners, which, according to my Invention, by
screw adjustment, may be made available for any nut or head within the largest
size of the said tool.
The tool is made with a four-sided aperture, within which an adjustable key
piece can be moved up or down in order to regulate the size of the aperture, and so
to adjust it to the size of the nut or head.
The two inner opposite sides of the apertures are V shaped, corresponding with
that of the adjustable key, or of other convenient shape, so that one may freely
slide in or on the other, and be properly held or guided.
The key may be moved up or down by means of a screw fitted to the key,
which is moved by means of a nut having milled edge, and working in a slot in
the handle.
Other means may be adopted for moving the key piece, such for example, as by
forming the handle with screw thread working through one side of the spanner
and attached to the key, but so as to turn therein.
.
The shape of the spanner may of course be varied, the essential feature in the
Invention being the construction of a spanner having an adjustable piece within it,
capable of being adjusted to suit the head of any nut or head of the size of and
smaller than the largest size of the spanner, the said piece or key being adjustable
by means of a screw.
By making spanners according to this Invention, they will not spread at the
jaws when great strain is applied, the sliding bar being supported in the centre, and
not at the side as in spanners of the ordinary construction, at the same time the
sides of the aperture being supported on all sides, it is next to impossible for the
spanner to slip off the nut, however great the strain applied may be.
Figure 1 of the accompanying Drawings is a plan view of a spanner made
according to this Invention. One end A is made with a four sided aperture; the
sides in the aperture are formed so as to be suitable for guiding the key piece B,
say, in any of the forms shewn at Figures 5 to 8, which are sections across the
spanner part A. The key piece B is fitted or formed with a screw b, which passes
into a hole in the body or handle part C of the spanner; on it fits the nut c, which
works through an aperture in the handle part C of the spanner. By turning this nut
one way or the other the key piece is moved up or down so as to be adjustable for
different sizes of nuts or bolt heads.
The other end of the spanner handle C may be similarly fitted or be fitted as an
ordinary fixed open spanner as shewn, or as an open shifting spanner.
Figure 2 shews another mode of operating the key piece B; the latter is here
fitted with a screw b in such a way that the screw b can turn in the key piece B,
but connected thereto by a pin. The screw b itself forms a part of the handle
part C, which in this case thus forms a part separate from the spanner part A. By
turning the part C relatively to the part A, the key piece B can be adjusted as
required; d is a check nut for the better holding fast of the key piece.
Figure 3 shows another mode of adjusting the key piece B, which in this case is
formed as the nut for the screw part b of the handle C, which latter is connected to
the boss a of the spanner part A by one or two pins.

page_text: Figure 4 shows a modified or reversed arrangement, in which the handle end
forms the nut for the screw part 6 of the key piece B.
The Figures 5 to 8 shew various modes of arranging the inner sides of the part A
in order to guide the key piece B.
And having thus described and ascertained the nature of this Invention, I declare
that I claim, fitting a closed spanner with a key piece, which is adjustable for
various sizes of bolt head or nut by screw appliance, substantially as set forth.
In witness whereof, I, the said Arthur William Singer, have hereunto set
my hand and seal, this Twenty-fifth day of September, in the year of our
Lord One thousand eight hundred and seventy-seven.
ARTHUR
ATTTTCT AL
(L4.S.)