Steam-Engine Page: 3 of 5
2 sheets, 3 p. : ill. ; 23 cm.View a full description of this patent.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
UNITED STATES PATENT OFFICE.
DAVID L. CROSS, OF AUSTIN, TEXAS.
STEAM-ENGINE.
SPECIFICATIOI forming part of Letters Patent No. 342,335, dated May 25, 1886.
Application filed November 1, 1885. Serial No. 182,580. (No model.)To all whom it may concerMn:
Be it known that I, DAVID L. CROss, a citi-
zen of the United States, residing at Austin,
in the county of Travis and State of Texas,
5 have invented certain new and useful Improve-
ments in Steam-Engines; and I do hereby de-
clare the following to be a full, clear, and ex-
act description of the invention, such as will
enable others skilled in the art to which it ap-
io pertains to make and use the same.
My invention is an improvement in steam-
engines applicable particularly where frequent
reversing of movementis required,but equally
applicable, with immaterial modifications, in
15 driving any class of machinery. The engine
is provided with two fixed shallow cylinders,
one upon either side of a central point in the
main or driving shaft, the axis of said cylin-
ders being in line with the axis of said driv-
20 ing-shaft. Each of these cylinders has within
it a piston provided with a piston-head, which
revolves upon and with thedriving-shaft, both
being keyed to it permanently. At acentral
point upon the main driving-shaft, between
25 the two cylinders, is fixed a cam-wheel which
has two annular grooves not parallel to each
other, each of which engages a rod sliding in
a race, which is connected with and operates
a pair of slide-valves to open and close indue-
30 tion and exhaust ports which lead to the cyl-
inder - chambers, and simultaneously with
these movements opens and closes the cylin-
der-chambers by moving the abutments in a
line parallel with the axis of the main shaft.
35 The abutments referred to form at times dia-
phragms to direct steam and cnfine it between
the piston-heads and said abutments.
My engine, as shown in the drawings, has
four combined induction and education cocks,
40 four slide-valves, four induction-ports, and
four exhaust- ports. Two of the induction-
ports connect with the cylinder on one side of
the cam-wheel, and the other two connect with
the cylinder on the opposite side of said wheel.
45 Each cylinder has passing from it two ex-
haust-ports, which discharge through their re-
spective cocks. Steam enters the cylinders,
starting first on one side and then on the oth-
er, from steam - pipes which enter the com-
50 bined cocks at points longitudinally opposite,
the two others transversely opposite to thesebeing at the time closed against the entrance
of steam, but which serve meanwhile as ex-
haust- cocks. The two combined induction
and eduction cocks on either side of the cam- 55
wheel are connected with cranks, which sur-
mount their valve-stems by an arm connected
to a shaft properly journaled to the engine-
frame by a lever and a hinged arm, so that
when said shaft is moved by the engi neer front- 60
ward or backward longitudinally -opposite
cocks and ports are opened and the two others
closed to reverse the motion of the driving-
shaft and machinery connected with it. The
grooves in the cam-wheel are formed exactly 65
parallel to the central plane of said wheel one-
half its circumference, while their other halves
run inward toward said plane, nearly touch-
ing said planein theperiphery of said wheel at
exactlyopposite points. By thisarrangement 70
of cam -grooves opposite slide-valves and abut-
ments are reciprocated alternately, one set
with reference to the other, at each revolution
of the shaft, and impulse is given to one pis-
ton or the other the entire time that the por- 75
tions of the grooves parallel to the plane of
the cani-wheel are traversing the friction-roll-
ers of the sliding bar to move the abutments
and slide-valves. The piston -heads of the
two cylinders are fixed in radial lines from the 80
axis of the driving-shaft exactly one hundred
and eighty degrees, the one with reference to
the other, and this arrangement facilitates a
uniform movement, to the said driving-shaft
while steam is supplied to the cylinders, pre- 85
cluding the possibility of dead-points to check
the movement of the machinery.
In my drawings, Figure 1 is a plan or top
view of the engine. Fig. 2 is alorizontalsec-
tion through the steam-chests, exhibiting the 90
exact relation between the slide-valves and
other parts on either side of the cain-wheel.
Fig. 3 is a longitudinal section in a vertical
plane, showing the cylinders, the cam-wheel,
the sliding bars connecting slide-valves, and 95
abutments, &c. Fig. 4 is a transverse section
through valves and steam-chest on one sideof
the cam-wheel. Fig. 5 is a front elevation of
the engine. Figs. 6 and 7 are elevations of
the interiors of the steam-cylinders, exhibit- ioo
ing the relative positions of the abutments of
the pistons when steam is entering in one and
Upcoming Pages
Here’s what’s next.
Search Inside
This patent can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Patent.
Cross, David L. Steam-Engine, patent, May 25, 1886; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth171267/m1/3/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.