Abstract:
Provided is a sprinkler configured for irrigation of a predetermined area, the sprinkler including a sprinkler body having a central axis. The body is formed with an irrigation inlet configured for receiving irrigation fluid, and a nozzle configured for discharging therethrough a directional jet of the irrigation fluid. The sprinkler further includes a reciprocal element configured for performing a reciprocal rotary motion about the central axis, and a deflecting member including an attachment mechanism for fixed attachment thereof to the reciprocal element. The deflecting member is formed with at least a first deflective surface, and is configured for performing a reciprocal rotary motion about the central axis together with the reciprocal element. The deflecting member is configured to assume at least a first position with respect to the nozzle in which a first portion thereof faces the nozzle, by virtue of which the directional jet is emitted from the sprinkler at a first angle, and at least a second position with respect to the nozzle in which a second portion thereof faces the nozzle, by virtue of which the directional jet is emitted from the sprinkler at a second angle different from the first angle.

Description:
FIELD OF THE INVENTION 
       [0001]    This invention relates to sprinkler deflectors, in particular deflectors for impact sprinklers, adapted to control angle and distance of deflection. The invention is further directed to sprinklers fitted with an impact deflector. 
       BACKGROUND OF THE INVENTION 
       [0002]    Most impact sprinklers comprise a sprinkler body with a sprinkler nozzle, and a sprinkler arm mounted hingedly to the body to revolve about a central axis. The sprinkler arm (also known as ‘hammer’) is adapted to be operated by a jet emitted from the sprinkler nozzle. The hammer is generally formed with a curved portion designed such that impact of the jet upon this portion causes the hammer to perform a reciprocal rotary motion about the central axis, the rotary motion having enough momentum on the return, added with power of the directional jet, so as to cause rotation of the entire sprinkler body about the central axis. 
         [0003]    It should be appreciated that during rotation of the sprinkler, the extent of each angular increment of rotation of the sprinkler is erratic/random, i.e. one increment is not equal to the next, whereby the nozzle of the sprinkler rarely returns to the same position upon completing a full 360° turn. 
         [0004]    In the field of irrigation, especially irrigation by sprinklers, adapted to provide water to a predetermined area, it is usually desired to have a uniform spread of the irrigated substance, e.g. water, across the entire area. For this purpose, many sprinklers are provided with a splitter or deflector, adapted to split the water jet emitted from the sprinkler nozzle. 
         [0005]    In some sprinklers, the hammer itself serves as a deflector, since upon impact of the jet on the curved portion of the hammer, deflection and/or splitting of the jet takes place. 
         [0006]    In more advanced sprinkler, additional deflectors and splitters are employed to gain a wider spread of water along the horizontal plane, across the area to be irrigated. One example of such a sprinkler may be found in U.S. Pat. No. 4,453,673. 
         [0007]    Several constructions have also been devised to deflect the water jet along the vertical plane as may be found in U.S. Pat. No. 7,014,125, and U.S. Pat. No. 5,671,886 to the Applicant, as well as U.S. Pat. No. 4,632,312, U.S. Pat. No. 5,267,689, and a product by Irritrol systems (code 1015005, model AR3-LA) 
       SUMMARY OF THE INVENTION 
       [0008]    According to the present invention there is provided a sprinkler adapted to irrigate a predetermined area, said sprinkler comprising a sprinkler body having a central axis, and formed with a main irrigation inlet adapted for receiving irrigation fluid from a supply line and a nozzle adapted for discharging therethrough a directional jet of said irrigation fluid, said sprinkler further comprising a reciprocal element adapted to perform a reciprocal rotary motion about said central axis upon impact of said directional jet during periodical rotary motion of said sprinkler body, and wherein said reciprocal element comprises a deflecting member designed to move together therewith, and adapted for deflecting said jet along a plane essentially perpendicular to said central axis. 
         [0009]    According to a particular design embodiment, said sprinkler is an impact sprinkler and said reciprocal element is a hammer constituting a part of a motion generating mechanism adapted for imparting rotary motion to said impact sprinkler. Alternatively, said sprinkler may comprise a separate motion generating mechanism, wherein said reciprocal element is only adapted for reciprocal movement under the influence of said directional jet, and not for imparting rotary motion to said sprinkler. 
         [0010]    Said sprinkler body may have an essentially tubular shape extending along said central axis, wherein said main inlet is located along said central axis and said nozzle is defined about an auxiliary axis angled to said central axis and intersecting therewith. Said sprinkler body is designed such that when the sprinkler is positioned with said central axis perpendicular to the ground, the angle between the central and auxiliary axis is acute, such that said nozzle is directed upwards. 
         [0011]    Said sprinkler body may be formed with an attachment port adapted for receiving said motion generating mechanism in a freely rotational manner allowing said periodical rotary motion, said attachment port being optionally located opposite said main inlet along said central axis. Said sprinkler body may also be formed with a limiting arrangement adapted to determine the maximal angular range of the rotary motion performed by said motion generating mechanism, as known per se. 
         [0012]    Said motion generating mechanism is adapted to perform a reciprocal rotary motion about said central axis, entailing rotary motion of said sprinkler about said central axis in order to direct said nozzle, and consequently the jet emitted therefrom, in a circular pattern. During this rotary motion, the directional jet is periodically deflected in the horizontal plane. 
         [0013]    Said motion generating mechanism may be in the form of an elongated arm (hereinafter also referred to as a hammer) having a first and a second end, and an attachment port formed along said arm between said first and said second end. The arm may further be formed with a deflective wall extending essentially perpendicular to the longitudinal extension of the arm. The arrangement is such that when attached to said sprinkler body, said arm extends radially from the central axis, and said deflective wall extends essentially parallel to said central axis as known per se. 
         [0014]    Said deflecting member may be formed with at least a first deflective surface, and may be articulated to said arm such that said deflective surface is disposed at least partially circumferentially about said central axis. When articulated to said arm, the deflective surface of said deflecting member may be disposed above said nozzle and be essentially angled to the auxiliary axis of the nozzle, i.e. to the direction of the jet emitted therefrom. Alternatively, said deflecting member may be articulated to the arm such that the deflective surface is disposed below said nozzle. 
         [0015]    In operation, rotary motion of the arm about the central axis of the sprinkler, entails rotary motion of said deflecting member about the central axis along with said arm so as to bring said deflecting member to various positions with respect to said nozzle, including a position in which it may obstruct the nozzle and come in contact with said directional jet, thereby deflecting said jet, inter alia, along the vertical plane. 
         [0016]    It should be appreciated that such a deflection along the vertical plane effectively changes the range of irrigation of the sprinkler, by way of limiting the directional jet. 
         [0017]    Design variations of the deflecting member according to the present invention may include a deflective wall in the form of any one of the following:
       a continuous planar deflective surface, wherein the deflecting member is articulated to the arm such that said deflective surface has a fixed deflection angle, whereby upon obstruction of said directional jet, the angle by which said jet is deflected is the same regardless of the point of impact thereof on the deflective surface;   a continuous planar deflective surface, wherein the deflecting member is articulated to the arm such that said deflective surface has a varying deflection angle, i.e. upon obstruction of said directional jet, the angle by which said jet is deflected is dependent on the point of impact thereof on the deflective surface;   a continuous non-planar deflective surface having multiple curvature radii, whereby upon obstruction of said directional jet, the angle by which said jet is deflected is dependent on the point of impact thereof on the deflective surface; and   a plurality of deflective sub-surfaces, each having a different angle with respect to the central axis, whereby upon obstruction of said directional jet, the angle by which said jet is deflected is dependent on the deflective sub-surface which the jet impacts. It should be appreciated that each of the deflective sub-surfaces may possess characteristics similar to those of the deflective surface described with respect to the previous design variations.       
 
         [0022]    According to a particular design embodiment of the present invention, said deflecting member is optionally made of a flexible material, e.g. silicone, whereby the angle of deflection of said directional jet is affected by the impact of the jet on the flexible deflecting member and the change of shape resulting in such impact. In particular, only said deflective surface may be made of flexible material and be connected to a rigid deflecting member. 
         [0023]    According to still another design variation, said deflecting member may be substantially rigid, and comprise a plurality of flexible deflective sub-surfaces in the form of sheets of flexible material. 
         [0024]    It should also be appreciated that with respect to all of the above embodiments, said deflecting member may be designed such that when mounted onto the reciprocal element, it may reach an intermediate position in which the directional jet impacts the edge of the deflecting member, i.e. only a part of the cross-section of the jet perpendicular to its emission direction actually impacts the deflective surface. In such case, part of the jet may be deflected by the deflective surface while the other part is free to discharge from the nozzle without obstructions and acquire its full irrigation range. 
         [0025]    According to yet another specific design variation said deflecting member may be so designed as to be mounted on the arm such that a clearance exists along the circumferential direction between the deflective wall of the motion generating mechanism and the deflective surface of the deflecting member. Such an arrangement may provide a time interval in which a directional jet is emitted from the nozzle which is unobstructed by the deflecting member. 
         [0026]    Said deflecting member may be attached to said arm in a detachably attachable manner, for example by snap fitting. This may allow said sprinkler to become modular, wherein for each irrigation area, a different deflecting member may be chosen, having angles specifically designed for said predetermined area. 
         [0027]    In addition, it should also be appreciated that due to the downward deflecting properties applicable by the present invention, a higher water pressure may be used without exceeding the circumference of the area to be irrigated. 
         [0028]    It should be appreciated that since the extent of each angular increment of the sprinkler during its rotation is not equal to the next, and since the deflecting member is fixedly attached to the rotating arm, the irrigation range varies constantly. In other words, upon completing a full 360° turn, the sprinkler will not return to the same irrigation range. 
         [0029]    According to another aspect of the present invention there is provided a deflecting member for a motion generating mechanism, comprising a body formed with at least a first deflective surface, said deflecting member further comprising an attachment mechanism adapted for attachment thereof to a deflecting arm of said motion generating mechanism. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0030]    In order to understand the invention and to see how it may be carried out in practice, embodiments will now be described, by way of non-limiting examples only, with reference to the accompanying drawings, in which: 
           [0031]      FIG. 1  is an isometric view of a standard impact sprinkler known in the art; 
           [0032]      FIG. 2A  is an enlarged isometric front view of the impact sprinkler shown in  FIG. 1  comprising a deflecting member according to the present invention; 
           [0033]      FIG. 2B  is a top view of the impact sprinkler shown in  FIG. 2A , at an intermediate position of the hammer thereof; 
           [0034]      FIG. 2C  is a front view of the impact sprinkler shown in  FIG. 2A ; 
           [0035]      FIG. 2D  is a tilted front view of the impact sprinkler shown in  FIG. 2A ; 
           [0036]      FIG. 2E  is an enlarged side view of the impact sprinkler shown in  FIG. 2A ; 
           [0037]      FIG. 3A  is an isometric view of the deflecting member of the present invention used in the impact sprinkler shown in  FIGS. 2A to 2E ; 
           [0038]      FIG. 3B  is a bottom isometric view of the deflecting member shown in  FIG. 3A ; 
           [0039]      FIG. 3C  is a schematic exploded isometric view of a sprinkler hammer and deflecting member according to another example of the present invention; 
           [0040]      FIG. 4A  is a schematic isometric view illustrating deflection of a directional jet by a deflecting member shown in  FIGS. 2A to 2E ; 
           [0041]      FIG. 4B  is a schematic illustration of an irrigation cycle performed by the impact sprinkler and deflecting member as shown in  FIG. 2A ; 
           [0042]      FIG. 5  is a bottom isometric view of a deflecting member according to another embodiment of the present invention; 
           [0043]      FIG. 6  is a bottom isometric view of a deflecting member according to a further embodiment of the present invention; 
           [0044]      FIGS. 7A and 7B  are respective schematic bottom and top isometric views of a deflecting member according to the present invention, which is integrally formed with a reciprocating element of a rotary sprinkler; 
           [0045]      FIGS. 8A and 8B  are schematic isometric and side views of a deflecting member according to another embodiment of the present invention; and 
           [0046]      FIG. 9  is a schematic isometric view of a sprinkler comprising a deflecting member according to a further embodiment of the present invention 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0047]    With reference to  FIG. 1 , a standard impact sprinkler generally designated  1  is shown comprising a cylindrical sprinkler base connector  10  having a central axis X, a sprinkler body  12  rotatable with respect to the base connector  10 , and formed with a hammer frame  20 , a first irrigation nozzle  30 , a second irrigation nozzle  40  and a hammer  50 . 
         [0048]    The sprinkler body  12  is formed with a central channel (not seen) being in fluid communication with the irrigation nozzles  30 ,  40 , and has a seating arrangement (not seen) for the hammer  50 . The hammer frame  20  is formed with a top wall  22  having a central aperture  24  aligned with the central axis X, and two side walls  26 . It should be noted that the second irrigation nozzle  40  may also be closed to provide for different irrigation regimes as known per se. 
         [0049]    The hammer  50  comprises hammer body  52  formed with a central seat  51 , a top pin  53  and a spring seating  55 , all three being coaxially aligned. The hammer body  52  is formed with a moment generating portion  52   a , and a counterpart portion  52   b , formed at respective ends of the hammer body  52 . The moment generating portion  52   a  is formed with a frame  54 , a first inclined wall  56  and a second inclined wall  58  spaced apart along the frame  54 . 
         [0050]    In assembly, the hammer  50  is pivotally mounted onto the sprinkler body  12  such that the central seat  51  is mounted on the seating arrangement of the sprinkler body  12 , and the top pin  53  is received within the central aperture  24  of the hammer frame  20 . The hammer  50  is biased by a biasing spring  28  held between the top wall  22  of the hammer frame  20  and the spring seating  55  of the hammer  50 . 
         [0051]    The impact sprinkler  1  described above is a standard impact sprinkler known in the art and operation thereof is known per se, and therefore will not be described herein. 
         [0052]    Turning now to  FIG. 2A , the sprinkler  1  is shown with a deflecting member  100  according to the present invention fixedly mounted thereto, the deflecting member  100  comprising a deflecting portion  110 , a mounting portion  120  and a clearance portion  130 . In mounting the deflecting member  100  onto the impact sprinkler  1 , the mounting portion  120  is adapted for engaging the frame  54  of the moment generating portion  52   a  of the hammer body  52 . 
         [0053]    With reference to  FIGS. 3A and 3B , the deflecting member  100  extends circumferentially about a central axis Y located outside the deflecting member  100 . The deflecting portion  110  of the deflecting member  100  if formed with a deflective surface  112  extending between a first edge  112   a  and a second edge  112   b  of corresponding radii R a  and R b  about the central axis Y. 
         [0054]    The mounting portion  120  of the deflecting member  100  is formed with a mounting bridge  122  having formed a first and a second shoulders  124 ,  126  respectively on either side thereof. The second shoulder  126  is formed with two connecting pins  128  extending substantially parallel to the bridge  122 , adapted to be received within the hammer  50  of the impact sprinkler  1 . 
         [0055]    Between the deflecting portion  110  and the mounting portion  120 , a clearance portion  130  is formed. The clearance portion  130  is formed with a clearance surface  132 , angled by α to the deflective surface  112 . 
         [0056]    Turning now to  FIGS. 2B and 2E , the deflecting member  100  is mounted onto the impact sprinkler  1  such that the deflecting member  100  extends along the rotary path RP of the impact sprinkler  1 . In the mounted position, the bridge  122  rests on a top surface  54 T of the frame  54 , and the shoulders  124 ,  126  secure the deflecting member  100  to the frame  54  on each side thereof. The connecting pins  128  are received within two corresponding holes  57  of the frame  54 . 
         [0057]    With reference to  FIG. 3C , another example of a hammer, generally designated  50 ′, is shown where the snap engagement is constituted by a single hole  57 ′ formed in the hammer frame  54 ′, and a single pin  128 ′ formed in the deflecting member  200 ′. 
         [0058]    With additional reference to  FIGS. 2C and 2D , when mounted onto the impact sprinkler  1 , the deflections surface  112  is angled at  13  to a center line CL crossing the opening  32  of the nozzle  30 . It is observed that the deflecting member  100  is mounted such that at a specific position shown in  FIGS. 2C and 2D  the clearance portion  130  thereof faces the opening  32  of the nozzle  30 . It is also observed that part of the nozzle opening  32  is obstructed by the first inclined wall  56  of the hammer frame  54 . 
         [0059]    With reference now also to  FIGS. 4A and 4B , the operation of the rotary sprinkler  1  will now be described. In  FIGS. 4A and 4B , there is shown a deflecting member  100  having a different deflecting surface design. Nonetheless, the following description pertains to all design examples of the deflecting member. 
         [0060]    In operation, during rotary motion of the hammer  50  about the central axis X of the impact sprinkler  1 , the deflecting member  100 , being fixedly connected thereto, is displaced along with the hammer  50  along the rotary path RP. A single reciprocal movement of the hammer  50  with the deflecting member  100  mounted thereon may be broken down to the following segments: 
         [0061]    Moment generating segment—During this segment, a directional jet (shown  FIG. 4A ) is emitted from the opening  32  of the nozzle  30 , and impacts the first and second inclined walls  56 ,  58  of the hammer frame  54 . This impact imparts rotary motion to the hammer  50 , whereby the hammer frame  54  is displaced such that it does not obstruct the nozzle opening  32 . 
         [0062]    First long distance segment—After displacement of the hammer frame  54 , the nozzle opening  32  is faced with the clearance portion  130  of the deflecting member  100 . In this position, the directional jet is free to be discharged from the nozzle  30  without obstructions. 
         [0063]    Deflected segment (shown also FIG.  4 A)—thereafter, due to the rotary motion of the hammer  50 , the clearance portion  130  is displaced away from the nozzle opening  32 , and the nozzle opening  32  is faced with the deflective surface  112 . The deflective surface  112  deflects the directional jet downwards, effectively changing the range of irrigation thereof, determined by the angle α (shown  FIG. 3B ) and the location of impact of the jet on the deflective surface  112 . Furthermore, during the rotary motion of the deflective surface  112  with respect to the nozzle opening  32 , due to the inclination β of the deflections surface  112 , the irrigation range progressively varies. It is noted that this inclination angle β is not compulsory and that the point of impact of the jet may be changed simply by the orientation of the deflecting member with respect to the nozzle  30 . 
         [0064]    It should further be noticed with respect to  FIG. 4A , that the directional jet J emitted from the nozzle  30  is deflected at an angle θ from the deflective surface  212 , the angle θ being dependent on the point of impact of the jet J on the deflective surface  212 , and as previously mentioned, on the angular position of the hammer  50  with respect to the nozzle  30 . It should also be appreciated that the jet J as depicted in  FIG. 4A  is intended to demonstrate the general deflection direction of the jet J rather than the actual dispersion of the irrigation fluid. 
         [0065]    Second long distance segment (optional)—Since angular rotation of the hammer  50  is determined according to the water pressure of the directional jet and the biasing force of the biasing spring  28 , the sprinkler  1  may sometimes reach a position in which the hammer  50  is so angularly displaced that the nozzle opening  32  is no longer faced with the deflective surface  112 , and the directional jet is free to be discharged with no obstructions, similar to the position during the first long distance segment. 
         [0066]    Return segment—Since the hammer  50  is biased by the spring  28 , the hammer  50  is forced to return to its initial position. During such return, the above segments take place in a reverse order. Upon return, the walls  54 ,  56  of hammer  50  first become faced with the nozzle opening  32 , whereby impact of the directional jet thereon adds to the return momentum of the hammer  50 . Thereafter, the hammer  50  impacts the mounting frame  20  and causes angular displacement of the sprinkler body  12  with respect to the base connector  10 , as known per se. 
         [0067]    During the segments described above, the irrigation range is effectively changed due to deflection of the directional jet by the deflecting member  100 . After a certain number of reciprocal movements as described above, the impact sprinkler will be urged to complete a full 360° turn of the sprinkler body  12  about the central axis X. Such a full turn will be referred to herein as an irrigation cycle. Since the nature of operation of an impact sprinkler is essentially random, i.e. the angular displacement of the sprinkler body  12  about its axis X is not predetermined or constant, the irrigation range is effectively changed not only during reciprocal motion of the hammer  50 , but also during a full turn of the entire sprinkler body  12  itself. 
         [0068]    In other words, during the first irrigation cycle, the sprinkler body  12  reaches an angular position in which the directional jet is directed at an angle γ from the initial reference line I. In this case, for example, the impact sprinkler  1  reaches this position when the nozzle opening  32  faces the clearance portion  130 , whereby the directional jet is provided with its full irrigation range R 1 . After completion of the first irrigation cycle, and engaging in a second irrigation cycle, the sprinkler  1  again reaches the angular position γ, wherein the irrigation range is now R 2  which is shorter than R 1 . Statistically, the chances that the directional jet will have the same irrigation range, at the same angular position of the impact sprinkler  1  at two different irrigation cycles are essentially low. 
         [0069]    Turning now to  FIG. 5 , another embodiment of a deflecting member, generally designated  200  is shown comprising a deflecting portion  210 , a mounting portion  220  and a clearance portion  230 , the mounting portion  220  and clearance portion  230  being essentially similar to the corresponding portions  120 ,  130  of the previous embodiment. 
         [0070]    The deflecting portion comprises a central deflective surface  212 , and two peripheral deflective surfaces  214  and  216  respectively, all three being arranged consecutively along the deflecting portion  210  and separated by grooves  218 . The central deflective surface has a first section  212   a  angled at δ 1  to the clearance surface  232 , and a second section  212   b  angled at δ 2  to the clearance surface  232 . Each of the peripheral sections  214 ,  216  also comprise a first section angled at S i  to the clearance surface  232  and a second section angled at ε 2  to the clearance surface  232 . 
         [0071]    Thus, in operation, when using the deflecting member  200  described above, the angle of deflection of the directional jet, and consequently the irrigation range thereof, is effectively changed during rotary motion of the hammer  50 . It should be understood that irrigation range may be regulated by designing the deflecting member  200  to have a desired number of deflective surfaces. 
         [0072]    With reference to  FIG. 6 , yet another embodiment of the deflecting member is shown, generally designated  300 . The deflecting portion  310  of the deflecting member  300  comprises a first deflective surface  312 , a second deflective surface  314 , and a third deflective surface  316 , separated therebetween by grooves  318 . Each of the deflective surfaces  312 ,  314 ,  316  is formed with two sections, each being inclined at a different angle with respect to the clearance surface  332 . 
         [0073]    Turning now to  FIGS. 7A and 7B , another embodiment of a deflecting member is shown, generally designated  400 , which is generally similar to the deflecting member  200  shown in  FIG. 5 . However, in the present case, the deflecting member  400  is integrally formed with the hammer  450  of the rotary sprinkler  1  to form a single unit. An advantage of such a design may be the ease of manufacture, since the deflecting member  400  and hammer  450  may be manufactured by injection molding in a single operation. 
         [0074]    Attention is now drawn to  FIGS. 8A and 8B , in which another design of the deflecting member is shown generally designated  500 . The deflecting member  500  comprises, similarly to the deflecting members  200 ,  300  and  400  deflective sub-surfaces. In this example there are four deflective sub-surfaces  512 ,  513 ,  514  and  516  respectively. In addition, the deflecting member  500  has a wing-like profile  540 , being formed with a top surface  542  having a curvature similar to a wing of a plane. As can be seen best in  FIG. 8A , each of the four deflective sub-surfaces  512 ,  513 ,  514  and  516  extend a different distance from the top surface  542 , with sub-surface  512  being the closed to top surface  542 , sub-surface  516  being extended further from top surface  542  than sub-surface  512 , sub-surface  514  being extended further from top surface  542  than sub-surface  516 , and sub-surface  513  being extended further from top surface  542  than sub-surface  516 . 
         [0075]    In assembly, the deflecting member  500  is so arranged in front of the nozzle  30  of the sprinkler  1 , that the directional jet J emitted from the nozzle  30  is directed towards the sharp lead end  540 L of the wing-like profile  540 . 
         [0076]    In operation, the directional jet J is split by sharp lead end  540 L of the wing-like profile into an upper portion J U  and a lower portion J L . The lower portion J L  of the directional jet is deflected by the deflective surfaces  512 ,  513 ,  514  and  516  in a manner similar to that disclosed with respect to the above operation segments. The upper portion J U  however, is urged to travel along the top surface  542  of the wing-like profile  540  due to hydrodynamic laws, and is eventually disengaged from the top surface  542  at a different angle than that of the lower portion J L . 
         [0077]    The above arrangement allows reducing the upward force on the deflecting member  500  and consequently the hammer  50 , by the deflective surface being impacted only by a portion of the directional jet. It should also be noted that the upper jet J U  may provide a counter-force acting downwards on the deflecting member  500 . 
         [0078]    Turning now to  FIG. 9 , a rotary sprinkler generally designated  600  is shown comprising a frame  610 , a rotary irrigation mechanism  620  and a reciprocal arrangement  630  and a deflection member  700 , constituting a part thereof. The difference between the deflecting member  700  and the previously discussed deflecting members  100  to  500 , is that the deflecting member that the reciprocal element onto which the deflecting member  700  is mounted, is not part of the movement generating mechanism. 
         [0079]    The sprinkler  600  has a fluid channel  602  having a first open end  604  in order to receive and irrigation fluid, and an opposite open end  606  in order to discharge the irrigation fluid. The rotary irrigation mechanism  620  has a body  622  of conical form and is formed with a tilted channel  624  (not completely visible) adapted for receiving the irrigation fluid discharged from the open end  606 , funneling it to become a directional jet, and diverting the directional jet towards the reciprocal arrangement  630 . 
         [0080]    The reciprocal arrangement  630  is mounted onto the movement generating mechanism and is biased by a biasing spring  634 . The reciprocal arrangement is formed with a first and a second deflective wall  636 ,  637  adapted for deflecting the directional jet similarly to deflective walls  56  and  58  of the hammer  50  shown in  FIGS. 2A to 2E . 
         [0081]    In operation, the impact of the irrigation fluid at the titled channel  624  causes the rotary irrigation mechanism  620  to change its angular position, thereby changing the angular direction of the directional jet. 
         [0082]    Due to the impact of the directional jet on the deflective wall applying force to one rotary direction, and the biasing spring operating against such force, the reciprocal element  630  is urged to perform reciprocal rotary motion about the rotary irrigation mechanism  620  during operation thereof, similar to the reciprocal motion of the hammer  50  previously discussed. However, is should first be stressed out that the reciprocal arrangement  630  does not have a frame (such as frame  20  in  FIGS. 2A to 2E ) to impact and therefore does not effect the rotary irrigation mechanism to such an extent as the hammer  50  effects the rotary sprinkler  1 . 
         [0083]    The deflecting member  700  is formed similarly to the deflecting members previously discussed, having three sub-surfaces  712 ,  714  and  716 . The deflecting member travels with the reciprocal arrangement  630 , thus its manner of operation is generally the same as disclosed with respect to  FIGS. 2A to 2E . 
         [0084]    Those skilled in the art to which this invention pertains will readily appreciate that numerous changes, variations, and modification can be made without departing from the scope of the invention, mutatis mutandis.