Patent Publication Number: US-2007108312-A1

Title: Aspiration-type spray system

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to an aspiration-type spray system.  
      2. Description of the Background Art  
      Conventionally, spray systems of fluid are roughly classified into three types. A first type, which is represented by an aerosol, is configured so that propellant and fluid to be sprayed are contained in a pressurized container, and so that the propellant as well as the fluid is sprayed in the atomized or foamy state. A second type has a dual-container structure in which an inner container is a soft one that contains fluid to be sprayed, and an outer container includes a high-pressure gas so as to apply pressure on the inner container and spray the fluid. A third type, aspiration-type spray system comprised of a gas cylinder connected to a spraying mechanism and a chamber that contains fluid to be sprayed and is also connected to the spraying mechanism but separately from the gas cylinder, sprays the fluid after aspirating it from the chamber as spouting of the contents from the gas cylinder. The spray system of the third type has the following advantages. Since the fluid and the propellant are contained in different containers, compatibility between them or degeneration of the fluid due to the propellant does not have to be considered. In addition, since the chamber does not have to be a pressure-resistant container, the material and design of the spray system may be selected from a wide range of them. However, the third-type spray system is not in fact as popular as the first type. The present invention provides an improved spray system of the third type so as to make effective use of the spray system.  
      Conventionally, aspiration-type spray systems have been proposed as disclosed in the following Patent Documents 1 to 3.  
      Patent Document 1: Japanese Unexamined Patent Application published under No. H10-305243 (in  1998 ).  
      Patent Document 2: Japanese Unexamined Patent Application published under No. H11-169759 (see  FIG. 3 ) (in 1999).  
      Patent Document 3: Japanese Examined Utility Model Application published under No. H07-53734 (in  1995 ).  
      A spray system disclosed in Patent Document 1 is comprised of a gas cylinder and a fluid container, the fluid being paint here, both of which are completely separate, and a spraying mechanism, to which the gas cylinder and the fluid container are attached. In use, the gas cylinder is held and the actuator thereof is depressed by the user so that the fluid is sprayed. Regarding this type of spray system, since the fluid container is situated in front of the gas cylinder, if the fluid container is considerably large and heavy, the center of gravity is shifted to the front part of the spray system in user&#39;s hand, or the fluid container could get in the way, resulting in poor usability.  
      A spray system disclosed in Patent Document 2 has a fluid-containing chamber provided with a spraying mechanism (aerosol head) of an aerosol serving as a gas cylinder. Regarding this type of spray system, since the aerosol head limits the fluid chamber in size, if the aerosol head is forcibly made large, the upper part of the aerosol weighs too much, resulting in poor usability and vertical instability.  
      A spray system disclosed in Patent Document 3 is provided with a fluid container under a gas cylinder. Regarding this type of spray system, since a tube connecting the fluid container to a spraying mechanism has to reach the lower part of the gas cylinder by way of a lateral side of the cylinder, resulting in complicated structure of the spraying system.  
      Further, each of the spray systems disclosed in Patent Documents 1 to 3 does not include means for closing the fluid container, resulting in possibility of leaking out of the fluid from the fluid container in transport.  
     SUMMARY OF THE INVENTION  
      It is, therefore, an object of the present invention to provide an aspiration-type spray system including comprising a spraying mechanism, a gas cylinder connected to the spraying mechanism, and a chamber containing fluid to be sprayed and connected to the spraying mechanism separately from the gas cylinder. The spraying mechanism aspirates and sprays the fluid contained in the chamber by spouting gas from the gas cylinder. The spray system is capable of effectively preventing leakage of a fluid from the fluid chamber during transport or the like. It is another object of the present invention to provide a spray system in which it is possible to keep the weight of the spray system in good balance and to facilitate grasping and using the spray system even if a relatively large fluid container is employed as the fluid-containing chamber. It is yet another object of the present invention to provide a spray system capable of connecting the fluid chamber to the spraying mechanism without using a long tube, and facilitating assembling the spray system with a simple configuration. It is still another object of the present invention to provide a spray system capable of easy disposal of a gas left in the gas cylinder.  
      The aspiration-type spray system is comprised of a spraying mechanism, a gas cylinder connected to the spraying mechanism, and a chamber containing fluid to be sprayed and connected to the spraying mechanism separately from the gas cylinder. The spraying mechanism aspirates and sprays the fluid in the chamber by spouting a gas from the gas cylinder. The gas cylinder includes a stem having a small hole and an open/close valve that is opened by the stem in response to the pressure applied to it. The spraying mechanism includes a cylinder-connecting member connected to the stem of the gas cylinder, a fluid-connecting member connected to the fluid chamber, and an actuator for hand-operated spraying. An open/close valve is provided in the fluid-connecting member, and the operation of the actuator not only opens the open/close valve of the fluid-connecting member but presses the stem.  
      In another embodiment of the aspiration-type spray system, the spraying mechanism is provided on an upper end of a casing. The casing is cylindrical extending longitudinally, and an inner space of the cylindrical casing serves as a cylinder space that contains the gas cylinder longitudinally. The fluid chamber is formed longitudinally to be arranged laterally with the gas cylinder space. The spraying mechanism includes a connecting member for the gas cylinder and a connecting member for the fluid chamber, provided under the spraying mechanism.  
      In other embodiment of the aspiration-type spray system, the casing is a dual-wall cylindrical container including an inner circumferential wall and an outer circumferential wall. A space surrounded by the inner circumferential wall constitutes the cylinder space, and a space between the inner circumferential wall and the outer circumferential wall constitutes the fluid chamber.  
      In a further embodiment of the aspiration-type spray system, the casing is a single-wall cylindrical container including the outer circumferential wall. An inner space surrounded by the outer circumferential wall serves as both the cylinder space and the fluid chamber. The inner space contains the gas cylinder, and the cylinder&#39;s outer diameter is smaller than the inner diameter of the inner space. A space between an outer wall of the gas cylinder and the outer circumferential wall of the casing serves as the fluid chamber.  
      In a further embodiment of the aspiration-type spray system, the gas cylinder includes a stem having a small hole and an open/close valve that is opened by the stem in response to the pressure applied to the stem. The spray system further comprises a bottom formed on the lower end of the cylinder space and a gas disposal unit provided at the bottom. The gas disposal unit discharges the gas left in a used-up gas cylinder into the cylinder space by pressing the gas cylinder against the bottom from outside.  
      According to the present invention, an open/close valve is provided in the fluid-connecting member. By operating the actuator, the open/close valve of the fluid-connecting member is opened and the stem is pressed. It is thereby possible to effectively prevent leakage of the fluid from the fluid chamber during transport or the like. Further, only by operating the actuator during use of the spray system, the open/close valve is opened to make it possible to smoothly aspirate and spray the fluid (content liquid).  
      Also, the spraying mechanism is provided on the upper end of the casing, and the casing is cylindrical extending longitudinally. The inner space of the cylindrical casing serves as a cylinder space that contains the gas cylinder longitudinally, and a chamber containing fluid to be sprayed is formed longitudinally to be arranged laterally with the cylinder space. In addition, the spraying mechanism includes a connecting member for the gas cylinder and a connecting member for the fluid chamber, provided the spraying mechanism. Due to this, it is possible to provide the spray system that can keep the weight of the entire spray system in good balance, thus can be easily held by the user even if the fluid chamber is relatively large, and that can ensure high usability.  
      Furthermore, the fluid chamber can be connected to the spraying mechanism without a long tube, and the spray system can be assembled with a simple configuration.  
      Moreover, by providing a gas disposal unit that can discharge the gas in the gas cylinder into the cylinder space at the bottom of the casing. The gas in the gas cylinder can be easily discharged during disposal after use of the spray system. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1 (A) is a cross sectional view of a spray system according to a first embodiment of the present invention, and  FIG. 1 (B) is a front view of principal parts of the spray system shown in  FIG. 1 (A);  
       FIG. 2  is a cross sectional view of principal parts of the spray system shown in  FIG. 1 (A), showing a spraying state of the spray system;  
       FIG. 3  is a cross sectional view of the spray system, showing a disposal state of the leftover gas of the spray system shown in  FIG. 1 (A);  
       FIG. 4  is a cross sectional view of a spray system according to another embodiment of the present invention; and  
       FIG. 5  is a cross sectional view of principal parts of a spray system according to other embodiment of the present invention;  
       FIG. 6  is a cross sectional view of a spray system according to a further embodiment of the present invention;  
       FIG. 7 (A) is a cross sectional view of principal parts of the spray system shown in  FIG. 6 , and  FIG. 7 (B) is a cross sectional view of principal parts of the spray system shown in  FIG. 6 , showing a state in use of the spray system;  
       FIG. 8  is an enlarged view of further principal parts of the spray system shown in  FIG. 7 (A); and  
       FIG. 9  is an enlarged view of further principal parts of the spray system shown in  FIG. 7 (B). 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Embodiments of the present invention will be described hereinafter in detail referring to the accompanying drawings.  
      A spray system in this invention is comprised of a casing  11 , a gas cylinder  21  situated in the casing  11 , and a spraying mechanism  31  provided on the upper end of the casing  11 .  
      First, the gas cylinder  21  is a container for propellant, such as liquefied gas like DME, LPG, and fluorocarbon, and compressed gas like nitrogen, carbonic acid gas, laughing gas, and air or a mixture of them. The internal pressure of the cylinder may be set equal to an ordinary internal pressure for an aerosol product or a higher pressure than the ordinary, and may be set as desired type as long as the spouting of the gas can aspirate a fluid to be sprayed in a fluid chamber  15 , which is described later, and spray it. Further, the gas cylinder  21  may contain chemical fluids used in common with the propellant. The fluid contained in the gas cylinder  21  may be appropriately selected when the fluid can be maintained in the cylinder as well as the propellant, and sprayed together with the propellant. Specifically, the fluid may be the equivalent to be contained in the chamber  15 . Being more specific as for a method of use, for example, one constituent component of a two-pack chemical fluid (an exothermic agent, paint, adhesive, hair dye or the like) is contained in the gas cylinder  21  whereas the other constituent component is contained in the chamber  15 .  
      On the upper end of the gas cylinder  21  is provided with a stem  22 , in which a small hole (not shown) communicating with the inner space of the cylinder  21  is formed at the upper end thereof. Inside the gas cylinder  21  is provided an open/close valve (not shown) that is opened by the stem  22  in response to the pressure applied thereto. Specifically, the open/close valve is opened when the stem  22  is pressed down or inclined by the pressure, thereby spraying the gas in the cylinder  21  from the small hole of the stem  22 . Any of appropriate materials such as metal or synthetic resin may be used for the gas cylinder  21  corresponding to the internal pressure of the propellant. Further, in this embodiment, a neck portion  23  having a smaller diameter than that of the other part of the cylinder  21  is provided near the upper end of the cylinder.  
      Next, the casing  11  is a dual-wall container that includes an inner circumferential wall  12  and an outer circumferential wall  13 . A cylindrical space surrounded by the inner circumferential wall  12  constitutes a space  14  which the gas cylinder  21  sits in. The cylinder space  14 , being hollow in cross section, remains unclosed at the upper end until the attachment of the spraying mechanism  31 , and has a bottom  16  formed with a plate placed inside the inner circumferential wall  12 . The bottom  16  is set at such a position where the stem  22  of the gas cylinder  21  is stably situated with the spraying mechanism  31  when the cylinder  21  sits in the space  14  longitudinally. As shown in  FIG. 3 , a gas disposal unit is provided at the bottom  16 , in which the gas left in a used-up cylinder  21  is discharged into the cylinder space  14 . In details, a convex portion  17  is formed outside the bottom  16 , which receives the gas cylinder  21 , and an opening  18  substantially same in diameter as the small hole of the stem  22  is formed in the convex portion  17 . Specifically, the used-up gas cylinder  21  is set fit into the convex portion  17 , thus the stem  22  has to be pressed, then the gas left in the cylinder is discharged from the small hole of the stem  22  into the space  14  through the opening  18 . This is a safe disposal way of the empty cylinders. In this event, when the casing  11  is provided with a stopper  19  at where the stem  22  is sure to be pressed against the bottom  16 , the stopper being able to lock the gas cylinder  21  (at a neck portion  23  in this embodiment), the user do not have to hold the cylinder  21  to discharge the gas while the cylinder  19  is locked by the stopper  19 .  
      Space between the inner and outer circumferential walls  12 ,  13  of the casing  11  constitutes the aforementioned fluid chamber  15 , which is annular in cross section and remains unclosed at the upper end until the attachment of the spraying mechanism  31  in a fluid-tight manner. At the time of closing the fluid chamber  15  fluid-tightly, it is preferable to provide a packing on the upper ends of the inner and outer circumferential walls  12 ,  13  respectively, or on the lower end of the spraying mechanism  31  so as to keep the space fluid-tight. The chamber  15  has an annular-shaped bottom to be closed fluid-tightly, specifically, since the lower ends of the inner and outer circumferential walls  12 ,  13  are integrally formed to be coupled to each other, or, in some cases, to be bonded together. The fluid contained in the chamber  15  may be selected freely as long as the fluid can be aspirated by the spouting of the propellant. Examples of the fluid include liquids of daily necessaries, e.g., air-freshener, deodorant, and cleaning agent, and fluids such as cosmetic products, drugs, paint, ink, alcohol, water, as well as powder fluids with properties of fluidity in total such as synthetic resin powder, which is represented by nylon powder, fine powder like silica, hollow microspheres such as shirasu (a kind of silica) balloon, and porous materials.  
      In the first embodiment, the fluid chamber  15  is longitudinally formed adjacent to the cylinder space  14 . More specifically, the cylinder space  14  is positioned inside (at the center) of the fluid chamber  15  that is arranged annularly (cylindrically). A gas cylinder  21  sits in the cylinder space  14  longitudinally. The upper end of the cylinder space  14  is set approximately equal in height to that of the fluid chamber  15 . Above the cylinder space  14  and the chamber  15 A is provided a spraying mechanism  31 .  
      A spraying mechanism  31  in this embodiment is mounted in a cap  32 , which, being in a cap shape and not closed on the bottom, has an attach member  33  on the lower end to be attached to the casing  11 . A manner of attachment may be appropriately selected. In this embodiment, the attach member  33  is attached to the upper end of the inner circumferential wall  12  in a detachable fitting or engaging manner. Also, since the upper end of the fluid chamber  15  of the casing  11  is open in this embodiment, a chamber cap  34  is provided on the lower part of the cap  32  to close the fluid chamber  15  at the upper end thereof.  
      The spraying mechanism  31  is comprised of an actuator  35  for hand-operated spraying, and an acting unit  36  for a spraying movement in response to the manual operation. The actuator  35  has a pivotal supporting portion  37  at the front end, which pivotally supports the actuator to the cap  32 , and a depress portion  38  on the surface at the rear end, which the user depresses. On the underside of the actuator between the supporting portion  37  and the depress portion  38  is provided a depresser  39  for depressing the acting unit  36 . The user&#39;s depressing of the depress portion  38  entirely rotates the actuator  35  downward at the supporting portion  37 , whereby the depresser  39  presses down the acting unit  36 , which a connecting member  40  is disposed below to be coupled to the stem  22  of the gas cylinder  21 . As the acting unit  36  moves down, the stem  22  coupled to the connecting member  40  for cylinder is pressed down before the opening of the open/close valve inside the gas cylinder  21 , thereby discharging the propellant that subsequently flows into the connecting member  40 . A spray nozzle  41  is attached to the tip end of the connecting member  40  that extends forward. The spray nozzle  41  is comprised of a contracted part  42  that reduces the amount of flow of the propellant in order to accelerate the flow rate of the propellant, a confluent part  43  provided at the end side of said contracted part, and a spray hole  44  that is provided at the end side of said part  43  and sprays a mixture of the propellant and the fluid. The spray hole  44  preferably has a larger inner diameter (channel area) than the contracting part  42  does, more preferably, twice as large or more. Further, the confluent part  43  preferably has a larger inner diameter (channel area) than the spray hole  44  and the contracted part  42  do.  
      A connecting member  45  communicates with the confluent part  43  at the upper end thereof, and with the fluid chamber  15  at the lower end thereof through a connection hole  46  formed in the chamber cap  34 . Further, the connecting member  45  for fluid is provided with an O-ring  47 , which functions as a closing valve member, and enables the chamber  15  to be fluid-tightly closed in a usual state. Only when the acting unit  36  is pressed down by the actuator  35 , the connecting member  45  communicates with the fluid chamber  15 . In details, the connecting member  45  is closed at the lower part thereof, and the O-ring  47  is provided on the closed lower part. Further, a lateral opening  48  is formed on the upper side of the O-ring  47 . With the acting unit  36  and the connecting member  45  located at upper positions, the fluid-tightness is kept between the O-ring  47  and the inner wall of the hole  46 . With the acting unit  36  and the connecting member  45  located at lower positions, the opening  48  is positioned lower than the connection hole  46 , so that the connecting member  45  communicates with the fluid chamber  15 . The connection hole  46  is connected with a tube  49  that extends to the bottom of the fluid chamber  15  so as to be able to sufficiently aspirate the fluid present at the bottom of the chamber  15 . It is preferable that an opening area of the connecting member  45  with respect to the confluent part  43  is larger than the inner diameter (channel area) of the contracted part  42 .  
      Next, at the rear portion of the acting unit  36  is provided an open/close member  50  for air that is directed downward, and an O-ring  52  that functions as a valve is provided around a lower portion of the member  50 . On the other hand, the chamber cap  34  is provided with an air hole  51  into which the open/close member  50  is slidably inserted. With the acting unit  36  located at the upper position, the O-ring  52  keeps airtight between the open/close member  50  and the air hole  51 . With the acting unit  36  located at the lower position, the O-ring  52  is located lower than the air hole  51 , so that the air can be communicated through a gap between the open/close member  50  and the air hole  51 .  
      With the above-mentioned configuration, as the operation of the actuator  35  makes the acting unit  36  move downward, propellant contained in the gas cylinder  21  is discharged from the small hole of the stem  22 , flowing through the cylinder-connecting member  40 , the contracted part  42 , and the confluent part  43  before being sprayed from the spray hole  44 . Concurrently with this, the downward moving of the acting unit  36  opens a valve (O-ring  47 ) of the connecting member  45 , whereby the fluid chamber  15  communicates, through the tube  49  and the connecting member  45 , with the confluent part  43 . Following the propellant&#39;s spraying from the spray hole  44 , the internal pressure of the confluent part  43  becomes negative, and the fluid in the chamber  15  is aspirated through the connecting member  45  and the tube  49  before being sprayed, together with the propellant, from the spray hole  44 . At this time, with the acting unit  36  moving down, a valve (O-ring  52 ) of the open/close member  50  is opened, while the internal pressure of the fluid chamber  15  becomes equal to atmospheric pressure, thereby achieving sufficient continuous aspiration and spraying of the fluid.  
      When the user releases the depressed member  38  of the actuator  35 , the actuator  35  returns to the upper position owing to conventional urging means (not shown) provided in the gas cylinder  21  that urges the stem  22  upward, then the spraying of the propellant stops, while the valves of the connecting member  45  and the open/close member  50  are closed, then the fluid returns to be maintained in a fluid-tight and airtight state. As a result, there is no fear of leakage of the fluid in the chamber  15  during transport. In this embodiment, although the actuator  35  is pressed down, a manner of pressing the actuator  35  can be appropriately changed. For example, the actuator  35  can be pressed laterally or lifted up. Further, the detailed structure of the spraying mechanism  31  can be appropriately changed to, for example, the structure of the conventional spray system such as those disclosed in Patent Documents 1 to 3, when the fluid can be sprayed along with the spraying of the propellant. In this manner, setting of the respective upper ends of the gas cylinder  21  and the fluid chamber  15  to reach the upper portion of the casing  11  can achieve a simple mechanism to open and close the respective valves of the connecting member  45  and the open/close member  50  with a single operation of the actuator  35 . In particular, providing a valve of the open/close member  50  on the chamber cap  34  can achieve a valve-equipped open/close member  50  in the fluid chamber  15  by simply attaching the cap  32  to the casing  11 .  
      Moreover, the casing  11  and the cap  32  (spraying mechanism  31 ) may be detachably fitted or engaged to replace a gas cylinder  21  and supply fluid in the fluid chamber  15 , let alone fixed in order not to be detached by the user. In disposal of it, as described above, the gas left in the used-up cylinder  21  can be discharged, and only the empty cylinder  21  can be dumped separately. Further, the bottom  16  of the cylinder space  14  can be detachably provided as a sole detachable member. Furthermore, a single fluid chamber  15  is provided in the casing  11  in this embodiment. Alternatively, two or more fluid chambers may be provided by radially partitioning the fluid chamber  15  into a plurality of segments. In this case, two or more connecting members  45  for fluid are correspondingly provided, and multiple types of the fluids can be mixed together at or before the confluent part  43 . Or, the fluids can be selectively used with providing of an open/close or swing valve.  
      As shown in  FIG. 4 , the casing  11  can be configured not to provide an inner circumferential wall  12  according to the first embodiment. According to another embodiment of the present invention, the casing  11  is a single-wall cylindrical container with only the outer circumferential wall  13 , which constitutes an internal space which serves as both a cylinder space and a fluid-containing space. The outer diameter of the gas cylinder  21  is set smaller than the inner diameter of the outer circumferential wall  13 , then the space formed between the outer wall of the gas cylinder  21  and the wall of the casing  11  (outer circumferential wall  13 ) serves as a fluid chamber  15 . It is to be noted that, in order to keep fluid-tight inside the space, the opening  18  in the bottom  16  according to the first embodiment is either not formed or may be formed with an open/close valve. It is further necessary to close the gap between the upper portion of the gas cylinder  21  and that of the outer circumferential wall  13  so as to keep it liquid-tight.  
      Moreover, the valve structure provided on the connecting member  45  can be variously changed as long as the valve structure is closed in the usual state and can be opened based on the operation of the actuator. As shown in  FIG. 5 , a valve housing  61  is provided in the chamber cap  34  in a spray system according to other embodiment of the present invention. On the upper end of the valve housing  61  is provided a deformable elastic seal member  62  made of rubber or the like, underside of which is placed a bottomed cylindrical valve  63  that is slidable vertically and is urged upward by a spring  64  or the like to fluid-tightly close the gap between an upper end of the valve  63  and the seal member  62 . Similarly to the first embodiment, the tubular connecting member  45  having the opening  48  in the lower end thereof is provided to penetrate the seal member  62  and abut on the bottom of the valve  63  from above. The lower end of the valve housing  61  is unclosed and connected to the tube  49 . By so configuring, the fluid-tightness is kept between the upper end of the valve  63  and the seal member  62  in the usual state as shown in the left-half part of  FIG. 5 . On the other hand, as shown in the right-half part of  FIG. 5 , with the connecting member  45  pressed down by the operation of the actuator  35 , the valve  63  is opened against the urging force of the spring  64 , and the fluid can flows into the tube  49 , the lower space in the valve housing  61 , the space between the valve housing  61  and the valve  63 , the upper space in the valve housing  61 , the space between the valve  63  and the seal member  62 , the inner space of the valve  63 , the opening  48 , and the connecting member  45  in this order.  
      The valve structure according to the other embodiment can be used not only as that of the connecting member  45  for fluid but also as that of the open/close member  50  for air.  
      As described so far, the spray system according to the present invention can be configured to have a similar appearance to that of the well-known aerosol spray, to have a good weight balance, and to ensure high usability. The shape of the casing of the spray system according to the present invention is not limited to a cylindrical one but may be appropriately changed to, for example, a prismatic one.  
      Next, a further embodiment of the present invention will be described hereinafter referring to  FIGS. 6 and 7 .  
      Even in this embodiment, a spray system is substantially identical to the aforementioned one on the point of comprising a casing  111 , a gas cylinder  121 , and a spraying mechanism provided on the upper end of the casing  111 . However, it makes a difference that the gas cylinder  121  in this embodiment is provided outside the casing  111 , while the gas cylinder  21  in the aforementioned embodiment is provided within the casing  11 .  
      The casing  111  is a sealable container for liquid that is comprised of a single wall. The entirety of the inside of the casing serves as a fluid chamber  115 , where, same as the previous embodiments, fluid to be sprayed is contained. The shape of the casing in this embodiment is not limited to the one shown in the figure, but may be appropriately applicable to a cylindrical or prismatic one. The casing  111  in this example is provided with a cylinder space  114  where a gas cylinder  121  is placed. Top ends of the casing  111  and the gas cylinder  121  are disposed at substantially the same height, and a spray mechanism  131  is mounted on the top ends thereof.  
      The gas cylinder  121  may contain various propellants as the aforementioned does. On the upper end of the gas cylinder  121  is provided with a stem  122 , in which a small hole (not shown) communicating with the inner space of the cylinder  121  is formed at the upper end thereof. Inside the gas cylinder  121  is provided an open/close valve (not shown) that is opened by the stem  122  in response to the pressure applied thereto. Specifically, the open/close valve is opened when the stem  122  is pressed down or inclined by the pressure, thereby spraying the gas in the cylinder  121  from the small hole of the stem  122 .  
      The spraying mechanism  131  is comprised of an actuator  135  for hand-operated spraying, and an acting unit  136  for a spraying movement in response to the manual operation. Below the acting unit  136  is disposed a connecting member  140  that is coupled to the stem  122  of the gas cylinder  121 . As the acting unit  136  moves down, the stem  122  is pressed down before the opening of the open/close valve inside the gas cylinder  121 , thereby discharging the propellant that subsequently flows into the connecting member  140 . A spray nozzle  141 , which has the same structure in details as the first embodiment, such as including a confluent part  143 , is attached to the tip end of the connecting member  140  that extends forward.  
      As shown in  FIG. 7 , a connecting member  145  communicates with the confluent part  143  at the upper end thereof, and is provided with an open/close valve  146  at the lower end thereof. A lid  134  for the fluid chamber  115  is formed with a connection chamber  147 , where a valve seat  148  is provided. The connecting member  145 , the lower end of which is slidably inserted into the connection chamber  147 , opens and closes a channel between the open/close valve  146  and the valve seat  148 . In details, the fluid chamber  115  is fluid-tightly closed by the open/close valve  146  that contacts the valve seat  148  in a usual state. Only when the acting unit  136  is pressed down, the open/close valve  146  is released from the valve seat  148 , thus the connecting member  145  communicates with the fluid chamber  115 . Consequently, the propellant is discharged out of the gas cylinder  121 , while the internal pressure of the confluent part  143  becomes negative, then the fluid to be sprayed in the fluid chamber  115  is aspirated through the connecting member  145  before being sprayed, together with the propellant, from the spray hole  141 . Like the previous example, an open/close member for air, which opens concurrently with the downward moving of the acting unit  136 , may be provided.  
       FIGS. 8 and 9  are enlarged views of further principal parts regarding  FIG. 7 , and a structure of the connection chamber  147  provided with an open/close member for air is described hereinafter referring to the drawings.  
      As described above, the connecting member  145  is provided with the open/close valve  146  at the lower end thereof. Upside of the valve  146  is provided with a passage  149  that communicates with the inside and outside of the connecting member  145 . When the open/close valve  146  is released from the valve seat  148 , the connecting member  145  communicates with the fluid chamber  115  through the passage  149 .  
      Meanwhile, a gap  151  between the cylinder-shaped connection chamber  147  and the connecting member  145  serves an air intake from outside the spray system. Air from outside through the gap  151  flows to the fluid chamber  115  via a vertical passage  152  provided in a manner to penetrate the lid  134  from inside of the connection chamber  147 . And, upside of the passage  149  is provided with an open/close valve  156  for air. The fluid chamber  115  is air-tightly closed by the open/close valve  156  that contacts a valve seat  158  provided with the connection chamber  147  in a usual state. Only when the acting unit  136  is pressed down, the open/close valve  156  is released from the valve seat  158 , thus the fluid member  115  communicates with the outside of the spray system via the vertical passage  152  and gap  151 .  
      Upside of the passage  149  is provided with a sealing member  153  that keeps tightness against the contacting wall, even when the connecting member  145  is in the action of sliding. Owing to this, flowing route of the air and that of the liquid are sure to be separated.  
      As described so far, the spray system according to the present invention may have a variety of shapes of the casing  111  and the gas cylinder  121 , and be designed freely corresponding to its purpose.