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Патент USA US3071112

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Jan. 1, 1963
Filed Aug. 8. 1960
2 Sheets-Sheet 1
Fig. 5..
WWW ‘9M 4211M
Jan. 1; 196-3
Filed Aug. 8. 1960
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26 t
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2 Sheets-Sheet 2
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United States Patent O?iice
Fatented Jan. l, 19%3
illustrated therein being contemplated as would normally
3,ti7 L162
occur to one skilled in the art to which the invention
Referring now more particularly to the drawings, there
is illustrated a jet boat ill having a hull ll, the hull being
provided with an intake opening 12 communicating be
John L. Buehler, Indianapolis, Ind, assiguor to The
Buchler Corporation, a corporation of Indiana
Filed Aug. 3, 196%), Ser. No. 48,291
2 tfllaims. (r31. 115—l2)
tween the bottom of the boat and a turbine 13.
The present invention relates to jet propelled water
craft and more particularly to means for steering and
controlling the direction and speed of such craft.
turbine 13 has a passage therethrough communicating
between the intake opening 12. and a passage 15 through
10 a tailpipe 16 secured to the rear of the boat. The turbine
At least one form of water jet-propelled boat involves
an engine arranged to drive a turbine which is located
within a conduit through the boat. Water is drawn into
the conduit through an intake opening at the bottom of
13 is driven by a conventional marine engine 14 through
a shaft 14A and functions to pump water from the in
take 12 to and out of the rear of the boat. The water is
formed into a jet by the converging surface 17 of an
the boat, is pumped through the conduit by the turbine 15 annular member 18 ?xed within the passage 15, the jet
and is exhausted in a stream from the rear of the boat,
the stream leaving the boat above the water within which
the boat is ?oating or is supported. The propulsion
principle depends directly on a basic law of physics which
provides that every action has an equal and opposite
reaction. Thus, as water is ejected astern, the boat moves
leaving the
Fixed to
of which is
is movable
boat at a point above the water line.
the tailpipe 16 is a housing 2!}, one function
to contain a depending gate or slide 21 which
within a vertically extending opening 22 to
various positions. There is provided means (described
in detail below) for raising and lowering a shaft 23
which is reciprocally received within a suitable bore in
the upper end of the housing 26. The gate or slide 21
trolling the direction of movement of such jet-propelled
is swivel mounted to the shaft 23 by a ball and socket
watercraft is the de?ecting of the jet of water as it leaves 25 connection 25. Thus, the gate 21, when: in the position
the rear of the craft. Thus, the jet may be de?ected
illustrated in FIG. 2, hangs freely within the housing
through various angles in a horizontal plane to turn or
24). It should be noted that the upward end of the hous
steer the boat and may ‘be reversed and directed beneath
ing is sealed or completely closed off except for the bore
the boat to cause rearward movement of the boat. Such
receiving the shaft 23 and that there are no openings to
jet boats are also usually provided with variable speed 30 allow the passage of water from the upward portion of
engines arranged to drive turbines which pump water to
the housing 20‘.
form the jet. Thus, a further means of controlling the
The housing 2%} is provided with a cylindrical bore 26
jet boat and more particularly the speed thereof involves
of the same size or slightly larger than the exit end of
means such as a throttle control for changing the speed
the opening through annular member 13, said cylindrical
35 bore 26 registering with the opening through the annu»
of the variable speed engine.
In the smaller type of boat such as is used by one or
lar member 18. When the gate 21 is positioned as in
two ?shermen and of a size comparable to a rowboat,
FIG. 2 above the opening 26, the turbine 13 may pump
it is desirable that these control means be easily operated
a stream of water through the annular member 18, through
A most effective way of steering and otherwise con
and require little attention so as to leave the ?sherman
operator as free as possible to fish. Therefore, it is a
primary object of the present invention to provide im
proved jet boat control means, said means being easily
operated and requiring little attention.
A further object of the present invention is to provide
jet boat control means capable of operation by one hand 45
to allow free use of the other hand for ?shing.
Related objects and advantages will become apparent
as the description proceeds.
The full nature of the invention will be understood
from the accompanying drawings and the following
description and claims.
FIG. 1 is a side elevation of a jet boat incorporating
the control means of the present invention.
FIG. 2 is an enlarged vertical section of the rearward
the vertically extending opening 22 and the cylindrical
opening 26 in the housing to be exhausted from the rear
of the boat. The housing 20 also functions to provide
a pivotal mounting for a pair of de?ector plates 27 which
are used for de?ecting the stream of water to steer the
The plates 27 are each pivotal about a vertical axis pro
vided by suitable shafts extending through projections 28
extending from the housing 2.3, the plates 27 being posi
tioned on opposite sides of the stream of water. In order
to turn the boat in one direction, one of the plates 27 is
pivoted into the jet stream by means of a steering quad
rant 29 pivotally mounted on the housing 2t} by means
of a shaft 29A positioned directly between the pivotal
mountings of the deflector plates, the quadrant 2% having
a pair of depending elements 2%3 located. outside of the
portion of the boat taken along the longitudinal axis 55 de?ector plates and arranged to pivot one or the other
thereof and showing in detail certain portions of the con
of the plates inwardly when the quadrant 2% is pivoted.
trol of the present invention.
The quadrant may be pivoted through the shaft 29A by
FIG. 3 is a top plan view of a portion of the structure
means of steering mechanism described below.
illustrated in FIG. 2.
A tiller, indicated generally by the numeral 35, is piv
FIG. 4 is a horizontal section taken along the line 4—4
oted about a horizontal axis upon a tiller support 36
of FIG. 2 in the direction of the arrows.
which has 21 depending cylindrical portion 3'?’ received
FIG. 5 is a top plan view of the most reaward portion
within a cylindrical bearing as fixed to the rear or tran~
of the structure illustrated in FIG. 2.
som 41 of the jet boat. A cylindrical element 42 is re
For the purposes of promoting an understanding of
ciprocably received and pivotal within a vertically ex
the principles of the invention, reference will now be made 65 tending aperture within the cylindrical portion 37 of the
to the embodiment illustrated in the drawing and speci?c
tiller support. The tiller support is provided with an
language will be used to describe the same. It will never
upwardly projecting yoke 44*, each arm of which has
theless be understood that no limitation of the scope of
pivoted thereon a link ‘53. Each of the links 453 has at
the invention is thereby intended, such alterations and 70 its opposite ends a pair of slots 45 and ‘i5 which extend
further modi?cations in the illustrated device, and such
further applications of the principles of the invention as
longitudinally of the link and receive pins 47 and 4h
?xed to the cylindrical element 42 and the tiller 35, re
spectively. It can be appreciated that when the tiller 35
is raised from the solid line position of PEG. 2 to the
dotted line position, the cylindrical element 452. will be
moved downwardly and when the tiller is moved oppo
sitely, the cylindrical element will be moved upwardly.
The lowermost position of the tiller is the solid line posi
tion illustrated in FIG. 2 in which the tiller rests upon
the tiller support 36.
Secured to the lower end of the cylindrical element 42
by means of threaded element St“; and not Si is a down
36 when the tiller is used to steer the boat, the yoke 52
will not pivot but instead will retain the position illus
trated in H6. 2 permitting operation of the tiller to raise
and lower the gate 21.
Mounted upon the distal end of the tiller is a throttle
control $55 which may comprise a knob arranged to per
mit pulling of the knob away from the tiller body or
pushing of the knob toward the tiller body to vary the
fuel supply to the conventional marine engine 14. Fine
10 adjustment of the throttle is provided by rotation of the
knob 35. The throttle control 85 has not been shown
in detail inasmuch as it is a commercially available Vernier
hand throttle type 346-906-18 manufactured by Arens
Controls Co. of Chicago, Illinois. The throttle cable 86
and is provided at its other end with a longitudinally
of the control 35 extends from the control through the
extending slot as which receives a pin 6i mounted within
tiller to a point adjacent the proximal end of the tiller
the two arms of a yoke 62 secured to the upward end
from which point it extends to and is operatively con
or" the shaft 23. It can be appreciated that the gate
to the engine 14.
or slide 21 may be raised or lowered to various positions
From the above description, it can be appreciated that
by raising or lowering the tiller 35. For example, when
the tiller 35 is resting upon the tiller support 36 in the 20 the present invention provides an improved jet boat con
trol means which permits the control of the speed, direc—
solid line position illustrated in ‘HS. 2, the slide 21 will
tion and steering of the jet boat by one hand. All that
be in the illustrated solid line position and when the tiller
is necessary to turn the boat is t! ‘ivot the tiller horizon
is raised to the dotted line position illustrated in H6.
tally and about the axis of the cylindrical element 42. All
2, the slide will also be in the dotted line position illus
25 that is necessary to speed up or slow down the boat is to
trated in FIG. 2.
push, pull or rotate the throttle control 85 on the end of
The housing Ed has formed thereon a downwardly and
wardly projecting yoke 52, the two arms of which receive
a pin 53 which passes through a slot 55 in a link 56. The
link 56 is pivoted at one end :37 upon the transom 41
forwardly curved de?ector 65. When the gate is moved
downwardly to the dotted line position, it completely
the tiller. (One convenient method of operating the device
involves the arm of the operator resting upon the tiller
with the hand surrounding the throttle control 85.)
blocks the flow of the stream of water from the annular
Finally, all that is necessary to raise or lower the gate 21
member 18 through the bore 26. Because of the fact 30 for reversing or stopping the boat is the raising or lower
that the upward portion of the housing 2% is completely
sealed or closed off, this water pumped from the turbine
must pass downwardly through an opening as in the lower
end of the housing, this opening facing in a direction gen
erally forwardly of the boat. The boat has a ?at element
67 secured to the lower end of its transom 41 and ?ush
with the bottom 7r"; of the boat and the edge of the open
ing 55, the ?at element preferably being at an angle of
ing of the tiller 35. All of the above controlling opera
tions may be accomplished simultaneously or at different
times by the use of one hand and arm according to the
desire of the operator.
While the invention has been illustrated and described
in detail in the drawings and foregoing description, the
same is to be considered as illustrative and not restrictive
in character, it being understood that only the preferred
seven degrees to the horizontal. However, even an angle
40 embodiment has been shown and described and that all
as great as that shown and possibly a greater angle is
changes and modi?cations that come within the spirit
operable. Because of the downwardly and forwardly
of the invention and the scope of the claims are also to
curving surface 71 of the de?ector '65, the ‘water from the
turbine moves downwardly and is exhausted in a gener
The invention claimed is:
ally parallel direction to the hat element 67 and passes
1. A control for a watercraft comprising means for
beneath the boat causing the boat to move rearwardly 45 moving water in a jet rearwardly of said craft, a block
according to the above mentioned basic law of physics.
ing element mounted on said craft and selectively mov
it should be noted that the gate
is movable to vari
able through a vertical path into said jet to de?ect it for
ous intermediate positions, one of which will cause the
wardly of said craft, a de?ector pivotally mounted on the
thrust from the turbine to be divided in such a manner as
to maintain the boat in a stationary position. When the
gate is in such a position, a certain percentage of the
water from the turbine passes through the lower portion
of the cylindrical aperture 26. The remaining portion of
craft about a vertical axis, said de?ector being positioned
to de?ect the unblocked jet at various angles in a hori
zontal plane, a tiller support mounted centrally on said
craft at the rearward portion thereof for pivoting about
a vertical axis, said tiller support having an axially ex
the water from the turbine passes downwardly and is
tending cylindrical aperture, a cylindrical element pivotal
de?ected by the member £5 to produce a thrust acting
ly received and vertically reciprocal in said aperture, a
to move the boat rearwardly and equalizing the forward
tiller mounted on said tiller support rearwardly of said
thrust produced by the water passing through the aperture
cylindrical element for pivoting about a horizontal axis
26. It can be appreciated that the gate 21 may be lowered
and extending inwardly of said watercraft whereby said
from this intermediate position to permit a slow rear
tiller may be easily operated by an occupant of said craft,
ward movement of the boat and it may be raised from 60 a link pivoted centrally to said tiller support and pivoted
this intermediate position to provide a slow forward move
at one end of the link to said cylindrical element and at
ment of the boat.
the other end of said link to said tiller whereby vertical
Fixed to the lower end of the tiller support 36 by means
movement of said tiller causes vertical movement of said
of screws ‘75 is a radially extending lever 76 which func
cylindrical element, linking means connecting said cylin
tions as a retainer for tiller support 36 and has ?xed to
drical element and said blocking element whereby ver
its extending end a depending arm 77. An adjustable
tical movement of said cylindrical element causes vertical
link 8% is pivotally connected at its opposite ends to the
movement of said blocking element, and linking means
depending arm 77 and to a lever 81 ?xed to the shaft 29A.
connecting said de?ector and said tiller support and so
it can be appreciated that the tiller 35 may be pivoted
proportioned and arranged that pivoting of said tiller
about a vertical axis extending through the cylindrical 70 support causes pivoting of said de?ector.
element 42 in order to move either one or the other of
2. A control as de?ned in claim 1 in which said water
the de?ectors 27 into the jet stream for steering the boat.
moving means includes a ‘variable speed engine the speed
it should be noted that the yoke 52 is pivotally mounted
of which may be varied to vary the amount of water in
upon the threaded element
so that as the cylindrical
jet, and a knob mounted at the distal end of said
element 42 pivots with the tiller 35 and the tiller support
tiller, operably connected to said engine and movable to
vary the speed of said engine and the amount of water
in said jet.
References Cited in the ?le of this patent
Rees ________________ __ June 22, 1920
Harman ______________ __ Aug. 7, 1945
Wodal ______________ __ Mar. 12, 1946
Hawkins _____________ __ Oct. 24, 1950
Michler _____________ __ Mar. 18, 1958
Hamilton ____________ __ Nov. 7, 1961
Great Britain ______________ _. of 1905
Germany ____________ __ Oct. 18, 1954
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