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Патент USA US3091407

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May 28, 1963
J. WYNSTRA
SELF-PROPELLED SPRINKLER
Original Filed May 14, 1958
3,091,397
4 Sheets-Sheet 1
m?‘
John Wynsfra
INVENTOR.
BY mm, MW
Arm-n]:
May 28, 1963
J. WYNSTRA
3,091,397
SELF-PROPELLED SPRINKLER
Original Filed May 14, 1958
4 Sheets-Sheet 2
-
mm
Qvmm§ vmQ
at
w.
Nut
John Wynsfra
INVEN TOR.
BY
Attorneys
May 28, 1963
J. WYNSTRA
3,091,397
SELF-PROPELLED SPRINKLER
Original Filed May 14, 1958
4 Sheets-Sheet 3
John Wynsfra
1N VEN TOR.
BY 0mm. MW
'
Ammuy:
May 28, 1963
‘J. WYNSTRA
3,091,397
SELF-PROPELLED SPRINKLER
Original Filed May 14, 1958
4 Sheets-Sheet 4
Ja/m Wynsrra
lNVENTOR.
3PM; MAMA
United States Patent v0 "ice
r
3,091,391
Patented May 28, 1963
2
1
hose, with one rear wheel omitted for clarity of illus
tration.
FIG. 2 is a sectional view taken on the line 2-2 of
FIG. 1.
FIG. 3 is a rear view of the sprinkler and hose in
FIG. 1.
3,091,397
SELF-PRUPELLED SPRINKLER
John Wynstra, Lyndon, Wash, assignor to Lyndon Metal
Craft Co., Inc., a corporation of Washington
Continuation of application Ser. No. 735,202, May 14,
1958. This application July 10, 1962,,Ser. No. 208,880
6 Claims. (Cl. 239-183)
FIG. 4 is a sectional view on an enlarged scale, taken
on the line 4-4 of FIG. 2.
FIG. 5 is a front view,- with parts shown in section,
This application is a continuation of my copending ap
plication Serial No. 735,202, entitled Self-Propelled 10 of the sprinkler and hose in FIG. 1.
FIG. 6 is an enlarged fragmentary sectional view
Sprinkler, ?led May 14, 1958, now abandoned.
taken on the line 6-6 of FIG. 2.
FIG. 7 is an enlarged fragmentary sectional view
This invention relates to lawn sprinklers and particu
larly to self-propelled lawn sprinklers that are operated
showing the valve part of FIG. 6 with the valve in the
from power obtained from the same Water supply which
is used to distribute water over the lawn or other area.
15 position at which the supplementary water spray is dis
charged to the lawn or other area and at which the motor
An object of the invention is to provide a novel self
chamber is purged.
propelled sprinkler that has a diaphragm type recipro
FIG. 8 is an enlarged sectional view taken approxi
eating motor intermittently charged and purged of water
mately on the line 8-8 of FIG. 5.
from the water supply by a valve whose timing is coordi
FIG. 9-. is a fragmentary sectional view taken approxi
20
nated with the operation of the motor.
mately on the line 9-9 of FIG. 1.
The motor is preferably made of a chamber that has
a ?exible wall, for example a diaphragm, to which a
FIG. 10 is an enlarged sectional view taken on the
line 10-10 of FIG. 2 and showing the guide wheel spin
walking beam actuating rod has been secured. The walk
dle assembly.
ing beam serves two functions. The ?rst function is to
FIG. 11 is a perspective view of the walking beam.
intermittently operate a pair of drive wheels on the 25
FIG. 12 is a perspective view of one of the drive
sprinkler and the second is to time the valve and actually
pawls that is engageable with teeth on one of the drive
operate the valve to cause the motor to reciprocate.
wheels.
Considering now the valve, it is a multi-position valve.
In the accompanying drawings there is a water con
In one position a valve port registers the water supply
duit 10 preferably a garden or other type of ?exible hose.
with the ?uid motor so that the motor actuated rod moves
This hose is adapted to attach to a source of water under
the walking beam through its power stroke. At'another
position the valve has one or more ports registered‘ with
the motor chamber and the atmosphere so that the motor
is purged of at least some of the water. But this water
is used as a supplementary spray since it is discharged 35
pressure and torpipe 12 that constitutes a part of water
generally laterally of the sprinkler and onto the lawn or
other area that is being watered. In the operation of the
sprinkler these valve positions are successively obtained
a bottom section 18, a top section 20 and an intermediate
causing the sprinkler to operate over an inde?nite area
The valve dis
charge supplementary spray can be made to reach the
sprinkler 14. The water sprinkler has a main frame 16
that is constructed in separate parts, as illustrated, or as
a single casting. When separate parts are used, there is
section 22, all bolted together by stay bolts 24. The bot
tom section has a ?at base 26 from which ?anges 30‘ and
28 depend. Axle 34 for the two rear drive wheels 36
and to distribute water over that area.
and 38- is mounted for rotation in hearings in ?anges 28
and 30. Each drive wheel has a plurality of spaced teeth
area adjacent to the sprinkler or can be discharged over a
40 thereon which serve two purposes.
One purpose is to
obtain traction by acting as treads and the other purpose
larger area. However, the main spray from the sprinkler
is to constitute part of a one~way drive connection. The
is obtained from a rotating sprinkling head that is in
direct registry with the pressure of the water supply.
45 teeth on wheels 36 and 38 cooperate with the remainder
of the wheels to form ratchet wheels with which pawls 42
A further object of the invention is to provide a struc
turally simple and compact self-propelled sprinkler that is
adapted to be guided by the same hose that supplies
and 44 are engageable.
Pipe 12 is suspended beneath the lower section ‘18 by
hangers 46 and ‘48 to which clamps 50‘ and 52 are fastened.
water under pressure to the sprinkler for both sprinkling
and sprinkler propulsion. Only three weeksv are neces 50 The pipe is held by the clamp and has a coupling 58
at one end with which the hose ‘10 is connected. An
sary in the sprinkler, one exerting a guiding function on
elbow '59 is at the opposite end of pipe 12 and has a riser
the sprinkler since it is grooved and disposed’ on the
60 attached to it. Note that the rotary spray head 62 is
hose, while the other wheels are drive wheels engaged by
at the top ‘of riser 60‘ and this provides primary spraying
a drive structure connected with the walking beam. The
water from the water supply ‘and that is connected by
walking beam is powered by the ?uid motor when the
hose 10.
walking beam is moved‘ in one direction, and is spring
The ‘front end ‘of the frame and more particularly pipe
returned to the opposite extremity in its movement.
‘12, has a caster assembly 64 that includes a grooved
During the power stroke of the walking beam the drive
wheel ‘65 mounted on hose 10. The grooved wheel con
wheels are moved, and during the power stroke and
spring return stroke of the walking beam, the valve is 60 strains the movement of the caster assembly, the latter be
ing capable of rotating 1a full 360° about its vertical
continually adjusted through its valve cycle of operation.
spindle 67. The spindle is secured in a bearing 68, and
The invention is embodied in a unique structural ar
the bearing is carried by mounting bracket 69 that is
rangement of a self-propelled sprinkler.
welded or otherwise secured to elbow 59‘ and that pro
These together with other‘ objects and advantages which
will be apparent reside in the details of construction and 65 trudes forwardly thereof.
A ?uid motor 70 is in the frame ‘16 and is of the
operate as more fully hereinafter described and claimed,
reciprocating type. Intermediate section 22 of the frame
reference being bad to the accompanying drawings form
is cylindrical enclosing 'a motor chamber 72. A dia
ing a part hereof wherein like numerals refer to like parts
phragm 74 extends across the chamber 72 and is attached
throughout, and in which:
,
between mounting ?ange 75 of section 22 and the lower
FIG.- 1 is a side view of the sprinkler showing it as it 70 surface of the ?at plate or base 76 of upper section 20.
would appear when operatively connected with a water
A walking beam actuating rod 78 is secured to the metal
3,091,397
'
3
backing plate 79 of the diaphragm 74 and is passed
through an opening 80 in the base 76. This opening
(FIG. 4) transversely through valve core 120. Accord
ingly, as the walking beam is raised and lowered by motor
vents the part of chamber 72 above the diaphragm 74 with
the part of the chamber 72 below the diaphragm adapted
78, the valve is caused to move to and through its various
positions. In one position (FIG. 4) water under pres
to receive Water from hose '10 and under considerable
sure is delivered through conduit 114 ‘and into the chamber
pressure which may be regulated by valve 84.
Motor 70, being 1a reciprocating motor, moves the
push rod 7 8 through its reciprocatory path of travel. The
72 by way of port 138‘ and valve chamber 126. Since
chamber 72 is exposed to considerable water pressure, the
diaphragm lifts thereby lifting the walking beam 88 and
causing the wheels 36 and 38 to be rotated through a few
wardly opening saddle within which a part of walking 10 degrees. ‘Meanwhile ports 136v are closed by the valve
core, and the sprinkler head 62 providing primary water
beam 88 is disposed. There is a slot 89 in the walking
is rotating. As the walking beam begins to lift the valve
beam, and a pin 98 passed through that slot and carried
core 120 begins to rotate in valve body i1‘18‘ thereby
by the sides of the yoke. This drivingly connects the
closing the port i116. The sprinkler has a spring 150 at
walking beam to the ?uid motor so that as the ‘actuating
rod 78 is reciprocated, the walking beam is caused to pivot 15 tached at one end to walking beam 88 and attached at
rod has a fork 86 at its upper end that forms an up
about its spindle 92.
The spindle 92 has reduced ends (FIG. 11) disposed in
bearings or simply in openings formed in the upstanding
the other end to an eye 152 or the like of frame section
walls 93 and 94 of the upper section 20‘ and that rise
vertically from the side edges of base 76 thereof. A trans
verse spindle 95 is at the opposite end of the walking
beam and has reduced ends on which pawls 42 and 44 are
beam to return to a rest position.
pivotally mounted. Typical pawl 42 is shown in FIG. 12,
through ports 136 that function as small nozzles, and yield
consisting of a boss 98 at one end ‘and having a tooth 100‘
a secondary spray.
18. This spring opposes the upward movement (power
stroke) of the walking beam 88 and causes the walking
In so returning, port
138 registers with the group of single ports 136 thereby
purging the chamber 72 of a considerable quantity of the
water therein and causing this water to be distributed
The foregoing is considered as illustrative only of the
at the opposite end. The tooth projects laterally from the 25
principles of the invention. Further, since numerous
body of the pawl so that the pawl can be located between
modi?cations and changes will readily occur to those
the drive wheels 36 and 38 but yet have the tooth drivingly
skilled in the art, it is not desired to limit the invention
engage the teeth 40 of the two drive wheels. FIG. 8
to the exact construction and ‘operation shown and de
shows the internal detail of boss 98. It has a setscrew
102 radially and adjustably mounted in it with the inner 30 scribed, and accordingly, all suitable modi?cations and
end of the set-screw reduced to ?t in a circumferential
equivalents may be resorted to, falling within the scope of
groove 104 formed in the reduced end of spindle 95
the invention as claimed.
(FIG. 11). Therefore the pawls are free to pivot on
What is claimed is:
spindle 95 but cannot slide off the ends thereof. It is
1. A self-propelled lawn sprinkler comprising:
now evident that ‘as the reciprocating motor is set into 35
(a) a carriage including a main frame;
operation, walking beam '88 will pivotally oscillate and
(b) a diaphragm motor on said main frame, with a
drive the wheels 36 and 38 to propel the entire sprinkler,
diaphragm element spanning most of the width of
as constrained in its motion by the caster assembly 64.
said main frame;
At the same time spray head 62 ‘distributes water through
(0) conduit means delivering water under pressure to
out an area around the sprinkler.
said carriage and to said diaphragm motor;
In order to cycle the motor 70 a valve 108 is carried
by the frame '16 and has means for delivering water under
pressure from pipe 12 (and hence hose £10) to the valve.
(d) a water flow control mechanism on said main
frame including a two-position snap action valve
These means consists of a conduit 114 that has ‘one end
ment to deliver water under pressure to said motor
during a power stroke and vent said motor during
a return stroke;
connected with pipe 112 through valve 84.
actuated by movement of the said diaphragm ele
The valve can 45
act as ‘a throttle valve and an on-otf valve.
The opposite
end of conduit 114 is registered with a port 116 in valve
body ‘118. The valve body is threaded or otherwise se—
cured to the side wall of frame intermediate section 22 and
is registered with the chamber 72 (FIG. 4).
(e) drive means for said carriage including a lever
element pivotally attached to said frame at one end,
with carriage driving pawl mechanism at the other
50
Valve 108 is a multi-position valve. It has a cylindri
cal core 12!) mounted for oscillation in the valve body
v118. A collar 122 is ‘at one end of the valve core and
abuts an end of the valve body to limit the motion of the
valve core axially with respect to the body ‘118. A seal 55
124 serves the usual purpose of establishing a seal between
the valve body and valve core. Valve chamber 126 is in
the valve core and is registered with the chamber 7 2. The
valve core has a water inlet port 130 adapted to register
with port 116 when water under pressure is to be intro 60
duced into chamber 72. The valve core is capable of be
ing turned to a new position at which port 116- is closed
and port 138 registers with one or a group of discharge
ports v136 in valve body 118. Ports 136 are preferably
but not necessarily laterally arranged with respect to the 65
sprinkler so that when water is discharged through ports
13-6, it forms a secondary sprinkler for the area adjacent
to the sprinkler.
As stated previously the valve core is adapted to oscil
late in :a rotary manner. The structure for actuating the
70
valve core is seen best in FIGS. 9 and 3. It consists of an
arm 140 that is secured to the spindle 95 and to a spring
142. A number of holes can be provided in arm 140
so that the spring tension can be changed by attaching it
into a selected hole.
Lever 1144 is attached to the opposite
end of the spring and is passed through a passage 148 75
end, the said drive means further comprising an
actuating connection between the diaphragm element
of said motor and an intermediate part of said lever
element; and
(f) means resiliently loading said diaphragm element
to move same through a return stroke when said
chamber is vented by said water ?ow control mecha
msm.
2. A self-propelled lawn sprinkler comprising:
(a) a wheeled carriage including a main frame;
(b) a diaphragm motor on said frame, ‘with a ?exible
diaphragm element spanning most of the width of
said frame;
(c) conduit means delivering water under pressure to
said carriage and to said diaphragm motor;
(d) a water flow control mechanism on said carriage
including a two-position snap action valve actuated
by movement of the diaphragm element of said
motor to deliver water under pressure to said motor
during a power stroke and vent said motor during
a return stroke;
(e) drive means for said carriage including a third
class lever mechanism pivotally anchored to said car
riage at one end and intermediately connected to
said diaphragm element, with pawl mechanism at the
other end of said lever mechanism arranged to drive
3,091,397
said carriage during a power stroke of said dia
’ (f) a dual-position valve in said‘ water supply line,
phragm element; and
(7‘) means resiliently loading said diaphragm element
said valve having porting at a ?rst position for di
recting water under pressure into said pressure cham
ber and having porting at a second position for ex~
haust-ing water from said pressure chamber;
to move same through, a return stroke when said
chamber is vented by said water ?ow control mecha
(g) valve actuation structure connecting said dual
nlsm.
3. In a self-propelled lawn sprinkler carriage compris
ing a wheeled frame with branched conduit means de
livering water under pressure to a spray head and to a
water pressure actuated motor carried by said frame; the 10
improvements comprising:
(a) a lever type drive mechanism including a pivoted
beam, one end of which is pivotally anchored to said
frame and the other end of which mounts a pawl
mechanism intermittently driving said carriage;
15'
(b) a motive element in said ‘water actuated motor
consisting of a movable plate engaging a ?exible dia
position valve to said lever means and operating said
valve synchronously with the movement of said
lever means, [the said valve actuation structure oper
ating to shift said valve to said first position when
said movable wall is at about a minimum chamber
volume position and to said second position when
said movable wall is at about a maximum chamber
volume position; and
(h) means resiliently Loading said ?exible diaphragm
andmova'hle wall to move same through a return
phragm overlapping said plate and maintained in
clamped engagement with a ?xed chamber wall, with
the said plate, diaphragm and ?xed wall de?ning an 20
enclosed pressure chamber spanning most of the
width of said frame;
(0) means drivingly linking said movable plate to said
pivoted beam at a point intermediate the ends of said
beam to provide a driving action characterized by 25
the generation of third-class leverage;
(d) a two-position valve constituting the control means
for said motor, and arranged in the water delivery
conduit associated with said motor, said valve being
positionally linked to said pivoted beam and at one 30
position thereof placing said enclosed chamber in
stroke when said valve is. in said second position.
5. A self-powered lawn sprinkler comprising:
(a) ‘a carriage including a main frame having laterally
disposed drive wheels;
(b) a reciprocating diaphragm motor on said main
frame, with a diaphragm element spanning most of
the width of said main frame;
(0) conduit means delivering water under pressure to
said carriage and to said diaphragm motor;
(d) a water ?ow control mechanism on said main
frame including a two-position snap action valve
actuated by movement of the said diaphragm ele
ment to deliver water under pressure to said motor
during a power stroke and vent said motor during
a return stroke;
communication with the associated branch conduit
(e) drive means for said carriage including:
to deliver water under pressure to said pressure
(1) ratchet means connecting with at least one
chamber and generate a motive power stroke by
movement of said movable plate, and at the other 35
of said drive wheels;
(2) a lever element pivotally connected to said
iirame at one end with pawl mechanism at the
other end constructed to engage and drive said
ratchet means during upward movement of both
the lever element and the pawl mechanism and
slip over said ratchet means durinlg downward
movement of said lever element and said pawl
position thereof communicating said pressure cham
ber for exhaust thereof to atmosphere to interrupt
the power stroke and permit a return stroke of said
movable plate;
(e) means resiliently loading said beam and movable 40
plate to return same to power stroke initiating posi
tion when said valve is in its chamber exhausting
mechanism;
position; and
(3) the said drive means further comprising an
(f) manually controllable valve means in said branched
conduit for regulating the proportion-ate ?ow of 45
water into said pressure chamber and thereby regu
lating the speed of the power stroke of said motor.
4. A lawn sprinkler adapted to be propelled by water
under pressure in a hose and be guided by the hose, said
sprinkler comprising:
50
(a) a ?rame having a forwardly mounted guide wheel
to track along the hose and a pair of rearwardly
mounted, laterally disposed drive wheels to straddle
mounted forwardly on said frame, with pawl means
at the other end thereof actuating ratchet means by
which the sprinkler is propelled forwardly;
chamber is vented by said water ?ow control mecha
msm.
sprinkler comprising :
(a) a frame having a forwardly mounted guide wheel
to track along the hose and a pair of rearwardly
mounted, laterally disposed drive wheels to straddle
the hose;
(b) ratchet means connected with at least one of said
(c) a water-actuated motor situated under said lever
means and just forwardly of the rearwardly mounted 60
drive wheels, said motor comprising an enclosed,
variable volume pressure chamber de?ned by a
stationary wall, a movable wall, and a ?exible dia
phragm arranged between said walls with a portion
of said diaphragm being in ?xed relation to each of 65
said walls, the said ?exible diaphragm and movable
wall spanning a major part of the width of said
frame and being responsively moved by water under
pressure chamber;
to move same through a return stroke when said
6. A lawn sprinkler adapted to be propelled by water
(b) lever means having one end thereof pivotally 55
ment of said movable wall;
(d) means drivingly linking said movable wall to a
point intermediate the ends of said lever means;
(e) a water supply line connecting said hose to said
of said lever element; and
(1‘) means resiliently loading said diaphragm element
under pressure in a hose and be guided by the hose, said
the hose;
pressure in said chamber to generate motive move
actuating connection between the diaphragm ele
ment of said motor and an intermediate part
drive wheels;
(c) lever means having one end thereof pivot-ally
mounted forwardly on said frame, with pawl means
at the other end thereof constructed to engage and
drive said ratchet means during upward movement
of both said lever means and said pawl means and
to slip over said ratchet means during downward
movement ‘of said lever means and said pawl means,
with pawl actuation of said ratchet means causing
forward propulsion of the sprinkler;
70
75
(d) a water~actuated, reciprocating motor situated un
der said lever means and just forwardly of the
rearwardly mounted drive wheels, said motor com
prising an enclosed, variable volume pressure cham
ber de?ned by a stationary wall, a movable wall,
and a ?exible diaphragm arranged between said
3,091,397
8.
walls with a portion of said diaphragm being in
?xed relation to each of said walls, the said ?exible
diaphragm and movable walls spanning a major part
of the width of said frame and being responsively
moved by water under pressure in said chamber to
generate motive movement of said movable Wall;
(e) means drivingly linking the said movable Wall to
a point intermediate the ends of said lever means;
(1'') a water supply line connecting said hose to said
10
pressure chamber;
(g) a dual-position valve in said water supply line,
said valve having porting at a ?rst position for di
recting water under pressure into said pressure cham
ber and having porting at a second position for ex
15
hausting water from said pressure chamber;
(h) valve actuation structure connecting said dual
position valve to said lever means and operating said
valve synchronously with the movement 01E said lever
means, the said valve actuation structure operating
to shift said valve to said ?rst position when said
movable Wall is at about a minimum chamber volume
position and to said ‘second position when said mov
able Wall is at about a maximum chamber volume
position; and
(1") means resiliently loading said ?exible diaphragm
and movable wall to move same through a return
stroke when said valve is in said second position.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,114,360
1,905,585
2,057,217
2,575,828
Hornung _____________ __ Oct.
Giesler ______________ __ Apr.
Soper __- ______________ __ Oct.
Muench _____________ __ Nov.
20, 1914
25, 1933
13, 1936
20, 1951
2,604,359
Zybach _____ .;_ _______ __ July 22, 1952
2,660,471
Egly et al ____________ __ Nov. 24, 1953
2,941,727
Zybach _> _____________ __ June 21, 1960
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