Improvements in Rotary Blowers, Pumps, and Exhausters.
Year: 1896

page_text: Date of Application, 26th Nov., 1896
Complete Specification Left. 16th July, 1897-Accepted, 2nd Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Rotary Blowers, Pumps, and Exhausters.
I, AUGUST WILLIAM KURZ, residing at 226 W. 136th Street in the City of New
York, State of New York, United States of America, do hereby declare the nature
of this invention to be as follows:-
This invention relates to the pistons or revolvers for rotary blowers, pumps and
exhausters, and it consists in constructing these, of a series of separate sections
assembled in line or end to end on the piston shaft, so as to afford a construction
that is light in weight and at the same time strong and durable..
For this purpose the separate sections are pressed out of sheet metal by dies, so as
to be of a cup shape and to have the required outline similar to that of the pistons
or revolvers of Roots and other blowers, and having a central hole for the passage of
the supporting shaft, flanged collars, having a slightly smaller diameter of bore than
the shaft, being rivetted or bolted to the sections at the central hole thereof. The
closed side of each cup shaped section is either formed with an indented shoulder at
the periphery, or it is simply rounded, so that the open end of the contiguous section
fits over such shoulder or rounded part, thus forming a more or less continuous flush
periphery along the entire piston. The end section of the row has its open end
closed by a flanged disc fitting into it and also, having a central hole and collar.
In assembling the several sections constituting the piston or revolver on the shaft,
the last named disc is first secured thereon, being first expanded by heating so that
its collar is shrunk on the shaft. The first section is then similarly heated and slid
on the shaft so as to overlap the periphery of the disc with its open end, the second
section is then fitted on in like manner, and so on till the revolver is complete, each
section being thus secured on the shaft by shrinking.
As each
If necessary the sections may also be secured thereto by other means.
section is independently secured to the shaft by a web formed by its closed end, a
very strong construction is thus obtained.
Dated this 26th day of November 1896.
COMPLETE SPECIFICATION.
Improvements in Rotary Blowers, Pumps, and Exhausters.
I, AUGUST WILLIAM KURZ, residing at 226 W. 186th Street, in the City of New
York, State of New York, United States of America, do hereby declare the nature of
this invention and in what manner the same is to be performed; to be particularly
described and ascertained in and by the following statement:-
This invention relates to the pistons or revolvers for rotary blowers, pumps, and

page_text: exhausters and it consists of the several parts and combination of parts hereinafter
described.
The object of this invention is to construct the pistons of revolvers for rotary
blowers and the like of a series of separate transverse sections assembled in line or
end to end on the piston shaft, so as to afford a construction that is light in weight
and at the same time, strong and durable, as I shall describe referring to the
accompanying drawings.
Fig. 1 is a side view partly in section, and Fig. 2. is an end view of a revolver or piston
made up of 5 sections. Fig. 3 is an elevation of the right hand end section Â, and
Fig. 4 is an elevation of one of the intermediate sections B. Figs. 5 and 6 are views
similar to Fig. 1. slightly modified however, for pistons which are smaller and shorter
in length. Figs. 7 and 8 are detail views shewing a side and end elevation respectively
of one of the collars.
Each section A and B is pressed out of sheet metal by dies, so as to be of a cup
shape and to have the required outline similar to that of the pistons or revolvers of
Roots and other blowers, and has a central hole for the passage of the supporting
shaft S.
On each section is rivetted a flanged collar C, the flange being of such shape as to
fit the interior of the cup and having a bore slightly smaller in diameter than the
shaft. As shewn in Fig. 4 each intermediate section B is made with a shoulder b
and a reduced part which fits into the mouth of the section next to it, and the last
section has its mouth closed by a cupped disk A¹ with collar.
In assembling the several sections constituting the piston or revolver on the shaft,
referring to Fig. 1 in the drawing, the last named disk is first secured thereon, being
first expanded by heating so that its collar is shrunk on the shaft. The first or left
hand section is then similarly heated and slid on the shaft so as to overlap the
periphery of the disc with its open end; the second section is then fitted on in like
manner, and so on till the revolver is complete, each section being thus secured on
the shaft by shrinking.
If however it is desired to construct the piston or revolver so that it can be taken
apart, the several sections are secured on the shaft by keying. The modified form of
the piston or revolver for a smaller blower, shewn in Fig. 5, consists of two sections A,
the open ends of which meet and overlap the interior flanged disc A¹. As shewn in
Fig. 6, the revolver, being chiefly adapted for still smaller blowers, consists of one
section, the open end of which is closed by the disc A¹.
In assembling the smaller revolvers, the flanged disc A¹ is first secured on the
shaft and then the cups A are afterwards slid thereon.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. In a piston or revolver for a rotary blower or the like, a transverse section of cup
shape, comprising a peripherically flanged plate of sheet metal having the outline of
the piston or revolver and a central hole and a collar attached for the passage of
the shaft.
2. A piston or revolver for a rotary blower or the like consisting of several
transverse sections of cup shape, with flanged collars attached, assembled in line and
secured on a shaft..