IMPROVED EXCAVATOR FOR CUTTING TRENCHES "
Year: 1880

page_text: LETTERS PATENT to John Frederick Sang, Architect, 24, Sackville Street,
Piccadilly, London, for an Invention of "IMPROVED EXCAVATOR FOR CUTTING
TRENCHES "
PROVISIONAL SPECIFICATION left by the said John Frederick Sang at the
Office of the Commissioners of Patents on the 5th June 1880.
JOHN FREDERICK SANG, Architect, 24, Sackville Street, Piccadilly, London.
"IMPROVED EXCAVATOR FOR CUTTING TRENCHES."
My improvements. consist in plough shares of various shapes arranged on a
frame in combination with elevators, so that after the earth is cut by the plough
it is conveyed to any reasonable elevation and delivered to the right or left band
of the trench being cut, so as to form an embankment.
My improved excavator can be made with duplicate ends, the same as the steam
plough, so that it may be worked from either end by the aid of steam power and
wire rope without the necessity of turning the machine round when it arrives at
either end of the trench; or it may be made with one set of ploughs and elevators,
when a lighter machine is necessary, and is required to be drawn by horses. The
aid of the accompanying Drawing will more clearly illustrate my Invention.
a represents the plough; b, b, the elevator; c, the trough for directing the earth
when cut away to the sides of the trench, and thereby forming an embankment.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Frederick Sang in the Great Seal Patent Office on the 4th
December 1880.
JOHN FREDERICK SANG, Architect, 24, Sackville Street, Piccadilly, London.
"IMPROVED EXCAVATOR FOR CUTTING TRENCHES."
My improvements consist in a guiding wheel with cutting discs or knives
attached to its sides, ploughs and shares of suitable shape and construction arranged
on a frame in combination with elevators, so that after the earth is cut by the
discs or knives and ploughs it will be conveyed to any reasonable elevation and
delivered to the right or left hand of the trench being cut, so as to form an
embankment.
The height of elevator may be regulated by making it to radiate from the centre f
on dotted line g, g.
My improved excavator can be made with duplicate ends, the same as the steam
plough, so that it may be worked from either end by the aid of steam power and
wire rope without the necessity of turning the machine round when it arrives at
either end of the trench; or it may be made with one set of ploughs and elevator,
when a lighter machine is necessary and is required to be drawn by horses.
In order that my Invention may be fully understood I now proceed more fully
to describe the same by the aid of the accompanying Sheet of Drawings, in which
the letters in the different Figures represent the same parts.
Fig. 1 represents a side view of my improved excavator; a is the guiding
wheel; b, the cutting discs; c, the ploughs; d, d, the elevator; e, e, the trough for
directing the earth; h, k, are two small wheels on shaft i for balancing the
excavator when subjected to the pressure of the wind; h, k, two belt pulleys for
driving elevator; 1, 1, the frame; j, j, j, forked projections for holding the earth
while being elevated.
Fig. 2 represents a plan of excavator.
In witness whereof, I, the said John Frederick Sang, bave hereunto set my
hand and seal, this Third day of December, in the year of our Lord One
thousand eight hundred and eighty.
JOHN FREDERICK SANG. (L.S.)