Improvements in Steam Engines.
Year: 1891

page_text: UCHING και
ΠΟΙ
United States of America),
Date of Application (in United Kingdom), 16th June, 1891
Complete Specification Left. 16th June. 1891-Accepted, 22nd Aug., 1891
Date of Application (in United Kingdom), 16th June, 1891
Complete Specification Left. 16th June. 1891-Accepted, 22nd Aug., 1891
COMPLETE SPECIFICATION.
Improvements in Steam Engines.
I, OTTO TACKMAN, of Yonkers, in the County of Westchester and State of
New York, United States of America, Wheelwright, do hereby declare the
nature of my invention for IMPROVEMENTS IN STEAM ENGINES, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of the present invention is to construct an engine which will have a
continuous motion in one direction, thereby overcoming the objection to the
reciprocating engine which is required to reverse its moving parts, such as the
cross-head, piston-rod and the piston, thereby consuming a considerable part of
the power; also a further object is to operate the engine without intermission
valves or valve gear, reversing valves alone being used to change the course of the
steam to reverse the engine.
These several objects above enumerated I attain by the construction substan-
tially as shown in the drawings and hereinafter described and claimed.
Figure 1 of the drawings is a top plan view of my improved engine, partly in
section.
of Fig. 1.
Figure 2 is a longitudinal vertical section thereof, taken on line
Figure 3 is a side elevation of cylinder, showing the guide for the abutment.
Figure 4 is a vertical section through the main shaft and cylinder, taken on y y of
Fig. 1.
Figure 5 is a sectional view taken through the abutment and guide on line z z of
Fig. 1.
Figure 6 an interior view of the cam plate for operating the abutment.
Figure 7 a detail view of the abutment.
Figure 8 a side elevation of the piston and piston-heads of the cylinder, and
Figure 9 a detail view showing the means for reversing the engine.
In the accompanying drawings A represents the cylinder provided with two
ports a a¹ which may be either the inlet or exit port for the steam, according to the
position of the reversing valves hereinafter described.
Passing through the cylinder A. is the main shaft B upon which is rigidly secured.
or made in one piece therewith the cylinder heads E, and between these heads is
located the piston D which extends from the shaft out to the inner periphery of the
cylinder; the outer edge of the piston being provided with a longitudinal groove d
for the reception of suitable packing.
The heads of the cylinder are made smaller than the cylinder on their outer ends,
with an inclined shoulder e extending around the heads and out to the interior of
the cylinder, as shown more clearly in Figs. 4 and 8.
Fitting within the ends of the cylinder A are the steam chests F which are in the
shape of a cup with an inner sleeve f fitting over the shaft and abutting against
the heads E, and an outer sleeve g upon each steam-chest fits the cylinder over the
heads E thereof; the space h formed by the end of the outer sleeve and the inclined
shoulder on the cylinder heads is to form a receptacle for suitable packing.

page_text: The ports a a¹ as will be noticed, extend through the outer sleeves 9 into the
stean chest, and through each cylinder head E is a port i which leads from the
chest into the cylinder.
The reversing valves H consist of a plug valve, one side of which being cut away
and so adjusted with relation of one to the other, that in one position steam may be
admitted on one side of the piston while it exhausts on the other.
As shown in Figure 4, steam from the pipe I is passing to the left-hand of the
cylinder through the port a while the exhaust passes out through the port a' and
pipe L, and the valves H by means of the handles kk and the rod are operated
together by one movement.
It will be seen by the foregoing description that the friction of the parts is
reduced to a minimum as the cylinder heads revolving with the shaft are balanced,
and a very slight pressure is required to prevent leakage of steam past the cylinder
heads,upon the packing in the spaces .
"The abutments shown at J confining the steam between them to the piston, are
made movable in and out of the cylinder to permit the piston to pass through its
revolution.
The abutments consist of an upper and lower plate m m¹ having on their outer
ends the flanges p, each plate being recessed on the sides where they come together
for the reception of the wedges n. Slotted plates are provided for the reception
of the plates m m' through which they extend; the flanges p coming in contact with
the latter mentioned plates to which the wedges are adjustably fastened by means
of the heads n'.
The guides for the abutments are formed by the plates r and s, the former being
cast on the cylinder, while the latter is separate and made fast to it and the spacing
pieces by means of the bolts v.
The abutments M have screw threaded rods N at their outer ends, which pass
through the plates u to the heads u¹ on the wedges n, and are provided with nuts w
by which wedges are adjusted.
•
The abutments M at their inner ends have open slots 6 to form guides by means
of the pins c, and the abutments have at their inner ends laterally extending
journals e' upon which are placed the rollers K.
The abutments M are placed upon the outside of the abutment guides, the upper
and lower plates of the guides extending far enough to form guides for the rods
with reference to any vertical movement; the lateral movement being controlled by
the slots and pin c. The lower guide-plate s is made steam-tight where it comes
in contact with the cylinder by means of the packing t.
The cam-wheels O have the flanges P. by which the abutments are made to
operate by means of the abutments M and the rollers K at the proper time to
permit the piston to pass.
.
By placing the abutments M on each side of the abutments J and using two
cam-wheels Ō, there is no binding of the abutments J when being operated.
In describing my invention I desire it understood that it is capable of many
changes or modifications in the several details of construction without departing
from the principle of my invention, and any such changes as would come within
ordinary mechanical skill I reserve the right to make without in any manner
affecting the essential features of the invention.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I. declare that what I
claim is :-
1. In a rotary engine, the combination of the cylinder, the rotary heads, each
of which is provided with a port upon opposite sides of the piston, and the
piston between the heads, substantially as and for the purpose set forth.
2. In a rotary engine, the combination of the cylinder with the rotary heads
reduced at their outer ends, the piston between the heads, and means substantially
as described for packing said heads, substantially as and for the purpose specified.

page_text: 3. In a rotary engine, the combination of the cylinder, the rotary heads
reduced at their outer ends and provided with ports on either side of the piston
with steam chests in the ends of the cylinder, substantially as and for the purpose
described.
4. In a rotary engine, the combination of the cylinder with the rotary heads
provided with ports upon each side of the piston and reduced at their outer ends,
the piston and the steam-chests in the outer ends of the cylinder and extending over
the reduced portions of the cylinder-heads, whereby a stuffing box is formed for the
heads, substantially as and for the purpose set forth.
5. In a rotary engine, the combination of the piston and cylinder with the abut-
ment formed of two plates, and means substantially as described for adjusting the
plates, substantially as and for the purpose set forth.
6. In a rotary engine, the combination of the piston and cylinder with an abut-
ment formed of two plates, and wedge between the plates, and means for adjusting
the wedge, substantially as and for the purpose described.
7. In a rotary engine, the combination of the piston and cylinder with an abut-
ment formed of two plates, a wedge for adjusting the plates, the abutment operated
by a cam, and means on the rod for adjusting the wedges, substantially as and for
the purpose described.
8. In a rotary engine, the combination of the cylinder, the rotary cylinder-heads,
the piston between the heads, the ports in the heads, the abutment consisting of two
plates adjusted by means of a wedge, and cams for operating the abutments,
substantially as and for the purpose set forth.
9. In a rotary engine, the combination of the cylinder with the rotary cylinder-
head, the piston between the heads, the ports in the heads, the steam-chests in the
ends of the cylinder and extending part way over the heads, a two-part abutment
adjusted by a wedge, and cams for operating it, substantially as and for the purpose
described.
F. W. BARKER,
Applicant's Agent.