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Патент USA US3033479

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May 8, 1962
Filed April 17, 1961
2 Sheets-Sheet 1
219 41
May 8, 1962
Filed April 17, 1961
2 Sheets-Sheet 2
11 31 12
United States Patent O?hce
Patented May ‘8, "1962
In another arrangement, a wedge piece is ?tted in lieu
of the spoon at the end of the swing arm. This wedge
piece is pivoted about its centre so that either face may
'be presented to the jet of water emitting from the nozzle.
Alfred James Green, Bournemouth, England, assignor to
WrightRain Limited, Riugwood, England
Filed Apr. 17, 1961, Ser. No. 103,334
As a result the swing arm can be thrust away in either
direction according to which face of the Wedge is facing
the water jet, and the direction of thrust will determine
the direction of rotation of the sprinkler. The back end
of the swing arm is ?tted with a pivoting striker plate
This invention relates to water sprinklers of the 510W
rotary type, particularly designed for use in orchards, 10 which strikes an anvil-forming part of the Sprinkler body
to cause it to rotate. The striker plate normally pre
gardens, golf courses, lawns and the like.
vents the swing arm from ‘being thrust too ‘far out of the
‘The type of sprinkler to which the invention particu
water jet and consequently the return swing of the arm
larly relates is that described and shown in United States
is short and fairly slow. When the sprinkler reaches the
patent speci?cation No. 1,997,901 wherein ‘basically the
limit of its sector, the striker plate swings over so that
sprinkler comprises a sprinkler body of tubular shape to
Claims priority, application Great Britain Aug. 5, 1966
3 Claims. (Cl. 239-230)
provide a water channel, and mounted for rotation about
it can hit the anvil on the opposite side and thus reverse
a vertical axis on a support member, with some ‘form of
the rotation of the sprinkler body. The last swing of
frictional gasket or packing in the bearing to oppose the
the arm is therefore unrestricted and travels much further
minates at the upper end in one or more arms e.g. 1n 20
away from the water jet. Its return swing is consequently
longer and faster and the wedge piece is carried through
the form of a Y, and at the end of an arm is a jet nozzle.
A horizontal swing arm is rotationally carried on a post
the water jet to the other side. This causes the wedge
piece to pivot and present the other face to the water
and rotates against a torsional spring surrounding the
jet during subsequent swings of the varm, and thus the
post. One end of the swing arm is provided with a
spoon which lies in the path of the water jet from one
of the nozzles. In consequence the water jet, by im
pinging on the spoon, drivesthe swing arm in a direc
arm swings in the other direction so that the striker plate
hits the anvil on the opposite side to turn the sprinkler
‘body in the reverse direction. When the sprinkler reaches
the other limit of its sector, the same action takes place
to return the sprinkler in its original direction of rotation.
in these known arrangements of sprinkler, setting levers
rotation of the sprinkler body. The body usually ter
tion of rotation away from the jet, while the sprinkler
body remains stationary due to the opposition. of the
gasket in the bearing therefor. The swing arm rotation 30 are provided to enable the arc of the sector which is to
be irrigated to be selected and preset by hand.
is made against the action of the resisting torsion spring,
As will be understood from the aforesaid summarised
so that after a given are of swing the inertia of the arm
description of known sectoring or part circle sprinklers,
is expended and the spring returns the arm in’the oppo
the mechanism is complicated, while the e?‘lciency of the
site direction—the forward direction-with a velocity
which causes it to break through the water jet and
strike the sprinkler body with such a ‘blow as to turn
it one step in the forward direction. The sprinkler thus
makes a step by step rotation in the forward direction
alternately with reverse swings of the swing arm, and
this action will be continuous through a full circle un
less some form of sectoring or part circle control mech
sprinkling is aifected because of unevenness of water ap
plication whilst the sprinkler is in reverse motion.
The object of the present invention is to provide a
simpler form of sectoring mechanism and one which pro
duces a more efficient watering action in that the reverse
anism is provided.
motion of the sprinkler at the end of a step-by-step‘ cycle
to the commencing position of the cycle is for all practi
cal purposes-instantaneous and under direct control of the
Thus in some known forms of sprinklers of the type
to which the invention relates, there has been provided
water jet pressure so that norm-ally the return would be
difficult to see with the eye.
lowing ways:
the type referred to includes an adjustable lock by which
at a predetermined point in the normal rotation of the
sectoring mechanism which may work in one of the fol 45
In one arrangement, when the sprinkler has reached
the limit of its sector, an anvil piece is brought into
proximity to the swing arm so that in swinging away—
According to the invention the improved sprinkler of
sprinkler body the water jet transmits rotary motion
through the swing arm to the body in reverse direction to
reverse direction-from the nozzle because of the thrust 50 restore the body to the beginning of a sectoring arc
whereat the lock is opened and the body commences its
exercised against the spoon of the arm by the jet of
step-by-step forward motion under the control of the
water emitting ‘from the nozzle, the swing arm strikes the
swing arm in the usual manner.
anvil before completing its reverse swing. The part of
The opening and closing positions of the lock are pre~
the arm which strikes the nozzle is the rear part behind
‘the pivot, and each blow against the anvil-awhich is at 55 settable to predetermine the extent of a sectoring arc and
cycle, thesequence of operation of which will be contin
tached to the sprinkler body but protrudes outside the
arm—drives the body of the sprinkler step by step in
uous and repeated so long as the water jet is operating or
the lock is in operative condition.
that normally taken when the sprinkler is rotated by the
In carrying out the invention, the lock may consist of
impact of the returning swing arm. In short, forward 60 lock closing and lock opening setting levers which co
rotation of the sprinkler body takes place at the end of
operate with a reaction link mounted on the sprinkler
the return swing of the arm, and reverse rotation of the
body for displacement into the path of the swing arm
sprinkler takes place at the end of the curtailed reverse
when the link strikes the lock closing lever, whereby the
the reverse direction to the forward direction which is
swing of the arm.
Consequently, the impacts are more
swing arm is connected with- the body to turn the same
frequent during reverse rotation and the speed of reverse 65 under the impetus of the water jet in the reverse direction
rotation is faster than in forward rotation. Resulting
until the link strikes the lock opening setting lever and
from these two factors, the evenness of water distribu
is thereby disengaged from the swing arm.
tion during reverse rotation deteriorates considerably.
In order that ‘the invention may be readily understood,
When the sprinkler reaches the other limit of its sector,
one practical example thereof will now be described with
the anvil piece is removed from its proximity to the 70 reference to the accompanying drawing in which:
swing arm and the sprinkler rotates in the original i.e.
FIGURE lis an elevation,
FIGURE 2 is a side elevation of FIGURE 1, and
forward, direction in a normal manner.
FIGURE 3 is a part sectional plan of FIGURE 1.
The sprinkler comprises a support in the form of a pipe
coupling nut 1 which is screwed to a stationary stand
pipe (not shown). Coaxially mounted in the nut is the
usual type of tubular isprlngler body 2 with a single arm
the pawl catch 14 from the locking face 10 on the swing
or Y head 3 and a spigot post 4 on which is rotationally
mounted a counter balance swing arm 5 with the usual
taining the jet.
The swing arm now being free from the body 3,
the sprinkler rotation reverts to the normal step-by-stcp di
rection, and the sequence of step-by-step movement A and
quick return is repeated as long as required by main
tontion spring 6 surrounding the post 4 for controlling
The step-by-step movement is evident from the con
struction. Su?ice to say that the jet of water impinging
the swing arm in the normal step-by-step forward rota
on the scoop 7 turns the swing arm 5 against the torsion
tion (A, FIGURE 3) of the body.
spring 6, while the sprinkler body (with nozzle 8) re
The swing arm 5 has a spoon head 7 which lies in front
of one of a water jet nozzle =8 on the head 3. On the
counter balance end 9 of the arm on the opposite side of
relatively stationary due to the resistance of the
gasket 25. When the energy of the swing arm has been
absorbed by the spring the latter returns the swing arm
in direction A until it swings through the water jet and
the spigot post 4 there is an angular locking face 1%
which forms part of the water reaction lock which con 15 imparts against an anvil portion 26 which forms part of
an overhung arm 27 on the sprinkler body 3. This im
stitutes the essential feature of this invention. As part
pact drives the body forward one step in the forward di
of this lock there is provided on the body a radially pro
rection A, and the swing arm immediately swings back
jecting horizontal pivot 11 for a reaction link pawl 12
under the action of the jet to repeat the operation.
having one upwardly projecting arm 13 adapted by means
The spigot post 4 on which the swing arm is rotation
of a catchhead 14 for co-operating with the angular lock 20
ally mounted is held in vertical position by a bearing
ing face 10. The pawl 12 has a depending arm 15 lying
support 28 on the overhung arm 27 which also forms an
between a pair of setting levers 16 and 17 projecting radi
anchor 29 for the control spring 6.
ally from the support 1 and angularly adjustable about
In practice it has been found that chattering of the
the vertical axis thereof by means of 'angularly spaced
notches 18 in the support 1 and pins 19 or like on the 25 locking pawl 12 may occur during its engagement with
the swing arm 5. To obviate this chatter while allowing
levers, or other indexing means (FIGURE 3) may be
the pawl to act as required, there may be provided some
form of motion absorbing device. Thus, for example, the
One lever 17 is the locking closing lever, and the other
pivot 11 or" the pawl may carry friction washers 30 which
lever 16 is the locking opening lever. The faces of the
levers 16 and 17 which co-operate with the depending 30 engage between the pawl and an adjusting nut 31 threaded
on to the pivot spindle 11 to enable the friction pressure
on the pawl to be adjusted as required.
in FIGURE 3 (2-0) to the pawl arm 15. A coil spring
I claim:
21 between a ?ange 22 on the sprinkler body and the
1. A water sprinkler, comprising a rotatable sprinkler
levers 16 and 17 presses the latter against a bearing
?ange 23 on the support 1 so as to keep the levers in place 35 body on which is mounted a swing arm and means where
pawl arm 15 are preferably curved concavely as indicated
while allowing them to be angularly set to the required
sectoring arc. It is only necessary ‘for the lever 16 (lock
closing) to be adjustable, but both may be so, if desired.
As will be seen the sprinkler body turns about a centre
by said hody is rotated step by step in a sectoring arc
under the action of a water jet issuing from said body and
impinging on said arm in combination with a quick
return device having reaction link means between the
spigot axis 24 around which the coil spring 21 is mounted, 110 body and the swing arm operable by body displacement at
the end of said sectoring arc to lock the body to the swing
and interposed between the body ?ange 22 and the spring
arm whereby the body and swing arm return together
under the action of the water jet to the commencement
point of the sectoring arc, and means displacing said
reaction link means to effect release of the lock at said
the nozzle 8.
whereby the body can re-commence its step-by-step
As will be appreciated from the foregoing the quick
sectoring arc.
return of the sprinkler body 2 at the end of a sectoring
2. A water sprinkler comprising a support adapted for
arc is brought about by locking the spoon 7 of the swing
in a water line, a sprinkler body rotatably
arm 5 in the water jet from nozzle 8 when reverse rotation
mounted on said support, a water nozzle radiating from
is required, so that the thrust of the water jet in the spoon 50
said body for projecting a water jet, a swing arm rotation
produces a reaction in the direction opposite to normal
ally mounted upon a pivot post upstanding from said
forward rotation (A). The rear end S‘ of the swing arm
above the nozzle, vsaid swing arm having a water
transmits this reaction to the sprinkler body through the
scoop at one end to lie in the path of the water jet from
pawl catch 14 which engages the face It} and thus locks
said nozzle, and at the opposite end a counter balance
the swing arm to the body, this engagement being caused
21 is a control gasket 25 which provides the necessary
friction to hold the sprinkler body stationary while the
swing arm 5 is turned backward by the water jet from
by the pawl arm 15 striking the lock closing setting lever
17 at the end of the sector arc. vAs this reaction is con
having a locking face, a torsion spring embracing said
post and anchored at one end to the swing arm and at the
opposite end to an upstanding anvil arm from said body,
tinuous during the period of locking, both the swing arm
whereby the body can sector through an arc step by
5 and body 3 are ?icked back together until the locking
step in one direction under the action of the water jet,
pawl catch 14 is disengaged horn the rear face 10 of the 60 locking means operable at the end of said are to connect
swing arm when the depending arm 15 of the pawl
the swing arm to the body so that the water jet effects a
strikes the lock opening lever 16. In particular the se
quick return of the body to the commencement of said
quence of operation is as follows:
sector arc, said locking means comprising lock closing and
On starting, the sprinkler rotates in the usual way in the
lock opening levers mounted on the support beneath the
forward direction A until the depending arm 15 of the 65 body ‘and angularly adjustable for varying said sectoring
pawl 12——the operating arm-is rocked anti-clockwise
(FIGURE 1) by contact with the lock closing setting
arc, a reaction link pawl mounted on said body on a
pivot at right angles to said swing arm pivot post, said
lever 17. This rocking of the pawl engages the catch on
pawl having an integral operating arm disposed between
the upper arm 13 with the angular locking face 10 on the
counter balance end 9 of the swing arm, whereupon the 70 said levers and a locking arm having a catch for engage
ment with the locking face of the counter balance.
sprinkler body 3 is rotated rapidly in the reverse direction
3. A water sprinkler comprising a support, a sprinkler
to A by means of the water jet from nozzle 8 being kept
body rotatable on said support, means including a swing
in the swing arm spoon 7. At the end of the return are
arm on said body for effecting step by step rotation in a
the pawl operating arm 15 is unlocked by striking the
lock opening setting lever 16 which thus disengages
forward direction of said body about the swing arm axis
under the action of a water jet from said body, a reaction
link between said body and said swing arm, an operat
ing 'member on said support arranged to displace said re
action link after a predetermined number of steps of said
body thereby to effect locking engagement of said link
with the swing am so that the swing arm and body rotate
together in the opposite return direction under the action
of the water jet, and a second member to displace the re
action link out of engagement with said swing arm at a
predetermined point in the return rotation of said body.
References Cited in the ?le of this patent
Kachergis ____________ _- July 21, 1959
Royer ______________ __ Mar. 15, 1960
Dunham ______________ __ June 3, 1947
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