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Патент USA US3098364

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July 23, 1963
Filed July 10, 1962
F/GI /
S .
Patented ,July 23, 1963
Juan D. Mendez-Llamozas, Av. ‘ ”-—-Urb. El Pinar,
Qta. “Cor0m0to”—-El Paraiso, Caracas, Venezuela‘
Filed July 10, 1962, Ser. No. 208,794
3 Claims. (Cl. err-35.54)
The invention relates generally to a jet propulsion de
vice and more speci?cally to a high pressure ejection
An object of the invention is to provide a device from
which jets of compressed ?uid are periodically discharged
in one of two opposite directions for driving a vehicle to
which the device is attached in a direction opposite to
the direction of the discharge.
According to the invention, ?uid under pressure is con
tinuously admitted through an admission port to a sub
stantially closed and stationary compression chamber. A
discharge port in the compression chamber opens into a
stationary ejector chamber.
This port is periodically
opened and closed by a valve and valve operating means
that are a feature of the invention. oppositely disposed
12 and extending between end walls 16 and 50 de?ne
with said end walls ejector chamber 54. Diametrically
opposed and coaxial valve seat openings 56 and 58 are
de?ned in auxiliary walls 52 and holes 60’ and 62 coaxial
with valve seat openings 56 and 58 are de?ned in side
walls 12.
Referring also and more particularly to FIG. 2 hollow
stemmed piston valves 64 are slidably mounted respec
tively in sleeve ejectors 66 and the combinations are re
spectively secured in holes 60 and ‘62 with piston valve
heads seating in the valve seat openings 56 and 58, and
the sleeve ejectors 66 extending in opposite directions
through the side walls 12'. Each of the sleeve ejectors 66
has a transversely positioned slot 68 outwardly of side
walls 12 and adjacent end wall 16 and extending in depth
to expose a surface portion 70 of the hollow stemmed pis
ton valve 64. The exposed surface 70 is machined to
form transverse rack teeth extending axially along the
hollow valve stem the outward end of the hollow piston
stem extending substantially beyond the slot 68 in the
sleeve ejector 66. A bracket 72 is ?xed on the side walls
12 adjacent each of the slots 68. Toothed segments 74
ejectors open outwardly from the ejection chamber in
opposite directions de?ning forward and reverse travel
are pivotally mounted :on the brackets with their teeth
ing drawing, in which:
the pivotally attached piston valve ‘42 which is guided in
respectively adapted to and engaging the rack teeth of
the exposed surfaces 70, of the slidably mounted piston
directions and means are provided for individually clos
valves 64. A linkage 76 is provided. for pivoting each
ing one ejector and opening the other. Thus jets of ?uid
can be discharged alternatively in one of the two opposite
toothed segment 74 on its bracket 72.
In operation pressure ?uid output of the compressor
travel directions.
is led by pipe 36 into the compression chamber 18 through
The foregoing objects and features, as well as various
other objects and features of the invention ‘and its prin 30 the opening 34. The motor 28' rotates thereby rotating the
crank shaft 18 by means of the meshed gears '30 and 26.
ciples and mode of operation will be more fully under
The crank shaft reciprocates the crank shaft rod 32 and
stood from the following description and the accompany
FIG. 1 is a side cross-sectional view of the invention, 35 linear reciprocation by the valve stem guide 48. The
reciprocation of the piston valve 42 is adapted to alter
FIG. 2 is an enlarged view of a portion of FIG. 1,
nately seat and unseat the valve head 46 in the valve seat
FIG. 3 is similar to FIG. 1 showing another embodi
opening 40 thereby releasing into the ejection chamber
ment of the invention, and
54 successive jets of pressure ?uid. The diametrically
FIG. 4 is an enlarged view of a portion of FIG. 3.
Referring to FIG. 1 the invention comprises a com 40 opposite hollow stemmed piston valves 64 are slidably
actuated in their respective sleeve ejectors 66 through the
pression chamber 10 de?ned by side walls 12 and op
pivoting of their respective tooth segments 74 by link
positely disposed end walls 14 ‘and 16. The side walls 12
ages 76 to open one valve seat opening (56 for example)
terminate at end wall 14 but extend beyond end Wall 16.
and close the other (58 for example) as illustrated in FIG.
A crank shaft 18 is journaled in bearings 20 and 22 that
are respectively mounted diametrically opposed in side 45 1. The jets of pressure ?uid escape from the ejection
chamber 54 through the open valve seat opening and the
walls ‘12. An end 24 of the crank shaft 18 extends
associated hollow stemmed piston valve 64 and are dis
through the side wall 12 and a gear 26 is mounted there
charged outwardly through the sleeve ejector 66 thereby
on. A motor 28, having a driving gear 30, is mounted
exerting an opposite force tending to drive the device in
to drive the gear 26 and crank shaft 18‘ in rotation. A
the opposite direction to the discharge. By reversing the
crank shaft rod 32 is mounted for reciprocation on the
setting of the hollow stemmed piston valves 64 the direc
crank shaft 18 in the compression chamber 10-. The end
tion of discharge and hence the driving force on the device
wall 14 de?nes an opening 34 in which an output pipe
is reversed.
36 is fastened that leads from a compressor 38. The end
Another embodiment of the invention is illustrated in
wall 16 de?nes a valve seat opening 40/. A piston valve
42 having a valve stem 44 and a valve head 46 is pivotally 55 FIGS. 3 and 4. In this embodiment the motor 28 and
gears 30 and 26 rotate a straight cam shaft 78 to which
mounted on the crank shaft rod 32 for reciprocation
is ?xed an eccentric cam 80 to rotate with the shaft. A
therewith. The valve head 46 is complementary shaped
piston valve 82 has a valve head 46 similar to the valve
‘and sized to ?t in the valve seat opening 40‘, and the
head 46 of the piston valve 42 however the valve stem
valve stem 44 is dimensioned in length to seat the valve
head 46 in the valve seat opening 40 to close it at proxi 60 84 is different, being longer than the valve stem 44 and
carrying on its free end a cam follower roller 86 adapted
mate dead center position of the crank shaft 18 and rod
to engage the cam 80. A spring 88 mounted on the valve
32 and to withdraw the valve head from the valve seat
stem 84 between the valve head 46 and the valve guide
at remote dead center position to open it. A valve stem
48, biases the piston valve 82 downward toward the valve
guide 48, integral with the side walls 12 intermediate the
end wall 16 and the pivoted connection of the rod 32 with 65 seat opening 40 and the cam follower roller 86 downward
the valve stem 44 at proximate dead center position, ex
into operating contact with the cam 80. Details of the
piston valve and cam arrangement of FIG. 3 is shown
tends transversely the piston valve axis of reciprocation,
in FIG. 4 enlarged and from a position 90 degrees around
and slidably engages the valve stem for guiding the piston
the vertical axis as shown in FIG. 3.
valve in reciprocating motion.
The operation of this embodiment differs from the ?rst
Another end wall 50 is ?ush to and integral with side 70
described only in the way the piston valve mounted in the
wall 12 and parallel to end wall '16 of the compression
compression chamber 10 is reciprocated. Reciprocation is
chamber. Inner ‘auxiliary walls 52 parallel to side walls
obtained by rotating the eccentric cam 80 to drive by a
cam follower roller 86 in reciprocation against the bias
of a spring 88. The advantage of the cam drive is that
the opening and closing of the piston valve in its seat
opening can be made as fast (or slow, and in any relative
proportions of cycle time as desired by changing the shape
of the cam.
‘oppositely disposed valves, having hollow stems, slidably
mounted in said respective opposite seat valve holes, said
valves being mounted with ‘hollow stems extending out
wardly through said holes; and means operatively con
nected to said opposite valves for individually sliding
said valves to open and close said opposite valve seat
holes, one of said holes being normally open and the other
closed, whereby‘pressure ?uid is released in a succession
Although the invention has been described with a cer
of jets from said compression chamber to said ejection
tain degree of particularity, it is understood that the present
disclosure has been made only by way of example and 10 chamber, the rate of release of said jets being dependent
on the speed of reciprocation of the valve mounted in the
that numerous changes in the details of construction and
the combination and arrangement of parts may be resorted
to without departing from the spirit and the scope of the
invention as hereinafter claimed.
compression chamber, and jetted through the open valve
seat hole and out of the hollow stem of the associated
valve in one of the two opposite directions the hollow
15 stems are oppositely disposed in, thereby driving the device
What I claim is:
in the opposite direction.
1. A jet propulsion device comprising: a ?uid com
2. A jet propulsion device as described in claim 1
pressor; a stationary substantially-closed compression
wherein said reciprocating means comprises a rotating
chamber connected to receive pressure ?uid from said
crank shaft and connecting rod mounted in the compres
?uid compressor; an ejection chamber adjacent to said
compression chamber, said chambers being intercon 20 sion chamber, and pivotally connected to said compression
chamber piston valve, said two limiting positions being
the two dead center positions of said connecting rod.
therebetween, and said ejection chamber additionally de
3. A jet propulsion ‘device as described in claim 1
?ning two diametrically opposite valve seat holes having
nected through a common valve seat opening de?ned
wherein said reciprocating means comprise a rotating cam
a concentric axis transverse to the longitudinal axis of
the common valve seat opening; a valve mounted for 25 shaft mounted in said compression chamber, a cam
mounted eccentrically on said cam shaft, a cam follower
reciprocation in said compression chamber between two
limiting positions in said compression chamber on the
roller mounted on the end of said compression chamber
longitudinal axis of said common valve seat opening,
and adapted to seat therein at one of said limiting posi
valve and adapted to engage said cam, and a ‘spring
ciprocating said valve between said limiting positions; two
No references cited.
mounted on [the valve ‘for biasing said cam-follower roller
tions to close said common valve set opening, and to be 30 against said cam.
lifted therefrom to open it; means for continuously re~
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