IMPROVEMENTS IN 'RICHARDS'' AND OTHER STEAM ENGINE INDICATORS
Year: 1871

page_text: PROVISIONAL SPECIFICATION left by Arnold Budenberg at the Office
of the Commissioners of Patents, with his Petition, on the 22nd
February 1871.—A communication from abroad by Bernard August
Schaeffer and Christian Friedrich Budenberg, of Buckau, near
Magdeburg, in the Kingdom of Prussia.
I, ARNOLD BUDENBERG, of the Firm of Schaeffer and Budenberg, of
Manchester, in the County of Lancaster, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN 'RICHARDS'' AND OTHER STEAM
ENGINE INDICATORS," to be as follows:―
The said Invention in the first place has for its object to obtain on
one paper and by self-acting means a consecutive number of diagrams.
For this purpose the drum upon which the paper is fixed in the
"Richards'" or other indicator is caused to slide upwards on an inner
drum at each reciprocation of the said drum. On the upper part of the
spindle upon which the inner drum revolves is loosely mounted a hollow-
and upon a boss or collar formed on the lower or inner end of the
said screw two sets of pawls are fitted to act. One set of the said pawis
is mounted upon a plate fixed to the central spindle, and therefore does
screw,

page_text: not revolve with the drum, the other set being carried by the inner
drum, and consequently revolving with the said drum around the inner
spindle. The effect of this arrangement is that when the drums rotate
in one direction the pawls carried by the said inner drum cause the
aforesaid screw to rotate, but during the rotation of the said drums in
the contrary direction the pawls carried by the fixed spindle hold the
said screw, and prevent it from making a reverse movement. It will
thus be seen that the said screw rotates intermittently in one direction.
A couple of levers are mounted in brackets fixed to the outer drum, ono
end of each lever being suitably formed to act as a nut or female screw,
so that when the said ends are moved in contact with the aforesaid screw
the said levers will be moved upwards during the rotation of the said
screw, and the outer drum will thus be caused to slide upon the inner
drum. The upper ends of the said levers enter spiral grooves formed in
a loose cover fitted to the outer drum, so that by turning the said cover
in one direction the lower ends of the said levers will engage with the
screw, and the indicator may be employed to make a number of
diagrams on the same paper, and by turning the said cover in the
reverse direction the said ends of the levers will be removed from
contact with the said screw, and the indicator may be used as an
ordinary indicator. A projection on the interior of the outer drum slides
in a slot or groove formed in or on the inner drum in order to prevent
the outer drum from rotating on the inner drum. It is preferred that
the ordinary pencil or tracer shall be constantly pressed against the
paper, and to draw the zero line a second pencil is employed, which
pencil is arranged to be adjustable to the required position, and to swivel
so as to be pressed against the paper when required. When the indicator
4

page_text: An indicator may be provided with a number of such pullies of suitable
size for various lengths of strokes, and marked to indicate the said
lengths of stroke.
A remaining portion of the Invention consists in dispensing with the
piston and spiral spring ordinarily employed, and in substituting therefor
a spring, such as is used in "Schaeffer's," "Dewit's," or other pressure
gauges, or of a steel tube, such as is employed in "Schaeffer's and
Budenberg's" hydraulic pressure gauges, or of a tube such as is used
in the "Bourdon" gauge. The instrument when so arranged may
be provided with a dial indicating the steam pressure, and may act as
a pressure gauge.