Improvements in Steam or other Gaseous Fluid Pressure Engines.
Year: 1899

page_text: Date of Application, 3rd Jan., 1899-Accepted, 25th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in Steam or other Gaseous Fluid Pressure Engines.
I, OLLIS PETER HARTMAN, Machinist, of Taylor, in the County of Williamson,
State of Texas, one of the United States of America, do hereby declare the nature
of this invention and in what. manner the same is to be performed, to be particu-
larly described and ascertained by the following statement:-
-
The invention relates to engines, and consists of the construction, combination
and arrangement of parts which will be hereinafter more fully described, and
claimed.
In the drawing forming a part of this specification.
Figure 1 represents a perspective view of an engine constructed according to
my invention.
Figure 2 is a vertical longitudinal section through the high and low pressure
cylinders and the parts connected directly thereto.
Figure 3 is a side elevation of the same showing the cover of the steam chest
and the valve which moves therein removed.
Figure 4 is an end elevation of the high pressure cylinder, showing the parts
leading therefrom to the low pressure cylinder, the low pressure cylinder being
shown partly in section and partly in elevation.
Figure 5 is a horizontal section through the steam chest, showing the high
pressure cylinder partly broken away.
Like reference numerals indicate like parts in the different views.
-The high pressure cylinder 1 is horizontally arranged and has the low pressure
cylinder 2 mounted upon it. The piston 3 and the piston rod 4 of the high
pressure cylinder are both of the ordinary form and construction. Pivoted to the
outer end of the piston rod 4 is a pitman 5 which is pivoted eccentrically to a
disc 6 upon the drive shaft 7, so that the reciprocation of the piston 3 will cause
a rotation of said shaft. Upon one side of the cylinder 1 is the steam chest
having the live steam inlet pipe 9 entering the same at one end. Steam inlet
ports 10, 11 lead from the steam chest 8 to the interior of the cylinder 1 at
opposite ends thereof. Exhaust ports 12 and 13 communicate with the exhaust
steam feed pipes 14 and 15 respectively, which enter the low pressure cylinder 2
at the upper and lower ends thereof. The said ports 10, 11, 12 and 13 are con-
trolled by a slide valve 16 whose stem 17 extends through one end of the chest 8
and is suitably connected with an eccentric upon the drive shaft 7 or other suit-
able part of the engine, whereby the reciprocation of said valve at the proper
time will be effected
The low pressure cylinder has moving therein the piston 18, the piston rod 19
of which extends through the head of the cylinder and is coupled through a
link 20 with one arm of a rocking lever or walking beam 21 which is fulcrumed
at a point intermediate of its ends to the upright or standard 22, as clearly shown
in Figure 1 of the drawings. The opposite end of said walking beam is con-
nected through the rod or pitman 23 with the disc 6 at the point of attachment
of the pitman 5 therewith. Upon the upper end of the cylinder 2 is located a
guide frame 24 consisting of a base and four upwardly extending parallel arma 25

page_text: between which fits and moves the walking beam or rocking lever 21. The said
beam is prevented from lateral displacement by said guide arms in a manner
which is apparent. The upper end of the piston rod 19 adjacent to its point of
connection with the link 20 is formed with laterally extending lugs or projec-
tions 26 which are located at right-angles to the walking beam 21 and fit and
move between the guide arms 25. These prevent a movement of the piston rod 19
in the direction of the length of the beam 21 so that by the provision of the
four arms 25 said piston rod is caused to move in a direct vertical line.
Adjacent to the upper and lower ends of the low pressure cylinder 2 are rotary
exhaust valves 27 and 28, respectively, the same communicating with a single
exhaust pipe 29. The stems 30 of said valves load outwardly from their casings
and have connected to them crank arms 31-31. The said crank arms are in
turn connected together by a rod or bar 32 which is pivoted at a point inter-
mediate of its ends to an auxiliary walking beam or rocking lever 33 fulcrumed
in the upright 22 and connected at its opposite end to a pitman 34 attached to
a ring 35 upon an eccentric 36 on the drive shaft 7.
By this construction it will be observed that the power from the high pressure
cylinder 1 will be exerted through the piston 3, piston rod 4, pitman 5 and disc 6
directly upon the drive shaft 7. The power from the low pressure cylinder 2,
also will be exerted through the piston 18, piston rod 19, link 20, walking beam 21,
pitman 23 and disc 6 upon the drive shaft 7. As the pitmen 5 and 23, however,
are connected to the disc 6 at an angle, it will be evident that a dead centre can
never exist.
It will also be observed that by means of the eccentric 36 on the drive shaft
and the auxiliary walking beam 33 which is connected to the rod 32 and through
it to the valves 27, 28, the rotation of said shaft will automatically cause the
actuation of said valves at the proper time, the same being so located relatively
one to the other, that when one is closed the other will be open and exhausting.
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:-
The combination with the cylinder of an engine and the piston rod thereof,
of lateral projections on said piston rod, a walking beam pivoted thereto, and
means for guiding said piston rod in a direct line consisting of a guide frume
having four parallel arms thereon, between one pair of which said walking beam
fits and moves and is prevented from lateral displacement, and between the
other pair of which said lateral projections fit and move and are prevented from
lateral displacement in the direction of the length of said walking beam.
Dated this 2nd day of Januar 1899