Patent Publication Number: US-6669061-B2

Title: Pump dispenser and spraying apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a pump dispenser, and in particular to a manually operated pump dispenser wherein the liquid contained in a cylinder is compressed by the displacement of a trigger structure so that the liquid may be ejected from the nozzle orifice. The invention also relates to a spraying apparatus provided with such a pump dispenser. 
     2. Description of Related Art 
     Traditionally, manually operated pump dispensers mounted on a vessel have been used for ejecting liquid. 
     FIGS. 17 and 18 show examples of the parallel displacement model of this type of pump dispenser, and are respectively a schematic illustration showing how it is used and an expanded sectional view showing specifically its construction. 
     This pump dispenser  100  is mounted on a liquid vessel B, and the liquid sucked from the vessel B and contained in the cylinder  101  is compressed with a piston  103  by the displacement of the trigger  102  and is ejected from the nozzle  104 . 
     The trigger  102  in this case is on the prolongation of the piston  103  and displaces in parallel, in other words it has a parallel displacement-type construction. 
     Unlike rotary trigger spraying apparatus, it has no winged protruding trigger and is relatively compact. 
     In actual use, as shown in FIG. 17 the user operates it by opening the fingers, for example, the index finger and the middle finger and holding the trigger  102  with them. 
     And by applying force on the fingers holding the trigger and pulling the trigger towards the cylinder  101 , the liquid contained in the cylinder  101  is compressed and is ejected from the nozzle  104 . 
     However, the operation of opening the fingers as mentioned above in the traditional examples, holding the trigger  102  with them and pulling the trigger  102  towards the cylinder  101  is different from the usual way of using fingers. Therefore, the operation is complicated and not so easy to perform. 
     And for example while the index finger and the middle finger are opened and hold the trigger  102 , on the other side the inner lower surface of the thumb will be in contact with the back side of the pump dispenser, and when the trigger is pulled with force, the fingers will be in an unnatural state. 
     Moreover, as shown in FIG. 17 or FIG. 18, the nozzle  104  is arranged at the end of a straight line from the cylinder  101 , and therefore in the event of a leakage, due to the position of the nozzle  104  between the fingers, the fingers tend to become soiled with the liquid. 
     And when the liquid is ejected downward, the whole liquid vessel integrated with the pump dispenser  100  must be inclined for use so that the nozzle  104  may face downward. Thus, a momentum results from the weight of the liquid vessel and burdens the operating hands. 
     And when the pump-dispenser is used in such an inclined position, if the cap  105  is not closed tightly enough, the liquid may leak from the gap between the cap  105  and the orifice of the vessel B. 
     On the other hand, in case of a pump dispenser with a rotary trigger not shown, as a trigger based on rotary motion is operated to start a linear motion of the piston, the piston and the trigger are connected by a free motion hole. 
     Accordingly, the transmission of power from the trigger to the piston is not necessarily precisely assured, and the oscillating motion of the piston in relation to the cylinder often becomes unstable. 
     And the trigger, the valve case, etc. are independent, resulting in a large number of components as a whole. 
     SUMMARY OF THE INVENTION 
     This invention was made under such a technical background. 
     It is therefore an object of this invention to provide a pump dispenser that gives a precise trigger motion to the piston and enables stable motion of the piston. 
     It is another object of this invention to provide a manually operated pump dispenser that can prevent careless operation of the trigger. 
     Another object of this invention is to provide a spraying apparatus provided with such a pump dispenser. 
     Thus, as the result of their devoted and intensive research carried out under such a background, the inventors of this invention found that the various problems mentioned above can be solved by integrating the valve casing (the second valve casing), the trigger section and the trigger guide section into a single trigger structure, and completed this invention based upon this finding. 
     This invention relates to (1) a manually operated pump dispenser mounted on a vessel wherein liquid contained in the cylinder section is compressed with a piston section by the displacement of a trigger structure and is ejected through the nozzle orifice, and includes a base body fixed on a vessel orifice via a packing structure including a cylinder section and a vent cylinder section formed adjacent to each other on the base body, the trigger structure including a trigger section, a second valve casing section mounted on the base body, and a trigger guide section oscillating in the vent cylinder section. 
     This invention also relates to (2) a pump dispenser wherein the nozzle cover is integrated with the second valve casing section via a hinge section. 
     This invention also relates to (3) a pump dispenser wherein the nozzle cover includes a protrusion designed to block the nozzle orifice. 
     This invention also relates to (4) a pump dispenser wherein the nozzle cover includes a mesh section for foaming and a nozzle stopper is provided between the nozzle cover and the nozzle orifice for closing the nozzle orifice. 
     This invention also relates to (5) a pump dispenser wherein the second valve casing section includes an anti-falling section relative to the base body. 
     This invention also relates to (6) a pump dispenser wherein the second valve casing includes an inside boss section and an outside boss section between which the cylinder section oscillates. 
     This invention also relates to (7) a pump dispenser wherein the outside boss section of the second valve casing forming a nozzle cover is formed with a downwardly slanting extension. 
     This invention also relates to (8) a pump dispenser wherein a virgin seal for preventing the pull back of the trigger structure is integrated with the vent cylinder section of the base body. 
     This invention also relates to (9) a pump dispenser wherein a trigger lock section for preventing the pull back of the trigger structure is integrated with the base body via a hinge section, and the trigger lock section is formed so as to be in contact with the final end of the outside boss section of the second valve casing section. 
     This invention also relates to (10) a pump dispenser wherein an inside virgin seal is provided at the final end of a cylindrical body of the piston section and a protruding shaft is provided in a cylinder receptacle section formed at the deepest end of the cylinder section. 
     This invention also relates to (11) a pump dispenser wherein a first valve casing section and a packing are integrated with each other to form the packing structure. 
     This invention also relates to (12) a pump dispenser wherein the packing structure is integrated with a tubular body. 
     This invention also relates to (13) a manually operated trigger-type pump dispenser mounted on a vessel wherein liquid contained in the cylinder is compressed via a piston section by the displacement of a trigger structure and is ejected through a nozzle orifice, including a base body fixed on the vessel orifice via a packing structure, a cylinder section and a vent cylinder section formed adjacent to each other on the base body, the trigger structure including a trigger section, a second valve casing section mounted on the base body, and a trigger guide section oscillating in the vent cylinder section, a nozzle cover integrated with the second valve casing section via a hinge section and a protrusion for plugging the nozzle orifice at the top of the second valve casing section formed by the nozzle cover, the second valve casing section being provided with an outside boss section and an inside boss section between which a cylinder section can oscillate, a virgin seal section for preventing the pull back of the trigger structure integrated with the vent cylinder section of the base body, a first valve casing section and a packing integrated with each other to form the packing structure, and an anti-falling section relative to the base body formed in the second valve casing section. 
     This invention also relates to (14) a spraying apparatus provided with the pump dispenser according to either one of (1) to (13) given above. 
     This invention can be constituted by combining any two or more from (1) to (13) given above provided that they are in harmony with this objective. 
     The pump dispenser according to this invention can transmit precisely the motion of the trigger structure to the piston and enables the piston to operate stably. 
     As described above, the pump dispensers according to this invention are assured of a superb operability and smooth and precise operation, are easy to use and enjoy a high reliability as products. 
     They transmit precisely the motion of the trigger section to the piston, and enable a stable operation of the piston. 
     The second valve casing of the trigger structure which includes an inside boss section and an outside boss section provides the piston section with an excellent stability of oscillation in relation to the cylinder section. 
     Similarly, the trigger structure which integrates the trigger section, the second valve casing and the trigger guide provides the piston with an excellent stability of oscillation. 
     And an anti-falling device is provided between the trigger structure and the base body to prevent any possible unexpected detachment or falling of the trigger structure from the base body. 
     The provision of a nozzle cover enables the user to easily block or open the nozzle orifice. 
     Because the trigger structure serves concurrently as the trigger section and the second valve casing section, and also because the first valve casing section and the packing are integral, the whole pump dispenser consists of a limited number of components, and therefore the number of assembly work steps is reduced. 
     The provision of the virgin seal section, the trigger lock section and the inside virgin seal prevents the possibility of the trigger structure being drawn in and thus assures safety in operation. 
     As the trigger structure is positioned in the same direction as the displacement direction of the piston section, no lag develops between them. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG.  1 (A) and FIG.  1 (B) show an example of composition of the pump dispenser in a preferred embodiment. 
     FIG.  2 (A) and FIG.  2 (B) show the state of the pump dispenser after the virgin seal section is separated from the state of the pump dispenser shown in FIG.  1 (B). 
     FIG.  3 (A) and FIG.  3 (B) are sectional views of an anti-fall mechanism provided between the second valve casing section and the cylinder section. 
     FIG.  4 (A) and FIG.  4 (B) are enlarged views showing the virgin seal section. 
     FIG. 5 is a sectional view of the packing structure. 
     FIG. 6 is a sectional view of another embodiment of the packing structure. 
     FIG.  7 (A) and FIG.  7 (B) show the state in actual use of the pump dispenser, and the state when the virgin seal section is removed and the trigger section is pulled. 
     FIG. 8 is a schematic sectional view showing an example of composition of a pump dispenser provided with the trigger lock. 
     FIG. 9 shows an example of composition of a pump dispenser provided with an inside virgin seal and a protruding shaft. 
     FIG.  10 (A) and FIG.  10 (B) are enlarged views of the inside virgin seal, and FIG.  10 (A) is a partial cross-sectional view and FIG.  10 (B) is an end view of the virgin seal as seen from the side of the protruding shaft. 
     FIG. 11 is a sectional view showing the state of the pump dispenser when the trigger structure is pulled back. 
     FIG. 12 is an enlarged schematic sectional view showing the inside virgin seal after having been pushed down by a thrust of the protruding shaft. 
     FIG. 13 is a sectional view showing a pump dispenser provided with a virgin seal section and an inside virgin seal. 
     FIG. 14 is a sectional view showing a pump dispenser provided with a trigger lock section and an inside virgin seal. 
     FIG. 15 shows a nozzle cover and a nozzle stopper for foaming. 
     FIG. 16 shows an example of the outside boss section extending in a downwardly sloping manner. 
     FIG. 17 is a schematic view showing an example of the traditional parallel displacement-type pump dispenser. 
     FIG. 18 is a sectional view showing the specific composition of an example of the traditional parallel displacement-type pump dispenser. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to FIGS. 1-16, the preferred embodiments of the pump dispenser according to this invention will be described. 
     To begin with, FIGS.  1 (A) and  1 (B) show an example of composition of the pump dispenser A according to this preferred embodiment. 
     This drawing, however, shows the state of the pump dispenser when the nozzle cover  14  is closed and the virgin seal  9  is not yet separated. 
     And FIG.  2 (B) shows the state the pump dispenser after the virgin seal section  9  is separated from the state of the pump dispenser A shown in FIGS.  1 (A) and  1 (B). 
     This pump dispenser A is a manually operated trigger-type pump dispenser as mounted on the vessel B in which the liquid contained in the cylinder  21  is compressed with the piston section  3  by the displacement of the trigger structure and is ejected through the nozzle orifice. 
     And it includes a trigger structure  1 , a base body  2 , a piston section  3 , a packing structure  4 , the first valve  5 , the second valve  6 , a tubular body  7 , a spring body  8 , a virgin seal section  9  and a cap  10 . 
     Unlike the traditional rotary trigger, the trigger structure  1  is integrally formed by a trigger section  12  and a second valve casing section  11 , and the trigger section  12  is integrated with the trigger guide section  13 . 
     It is preferable that these three components would be integrally formed from polypropylene. 
     As stated below, the second valve casing section  11  is installed on the base body  2  and the trigger guide section  13  is designed to oscillate within the vent cylinder section  22  of the base body  2 . 
     The piston section  3  is fitted at the top of the second valve casing section  11 , and the piston section  3  is arranged so as to be able to oscillate in the cylinder section  21 . 
     The second valve  6  is installed between the second valve casing section  11  and the piston section  3 . 
     And the second valve casing section  11  has a nozzle orifice  11 C (see FIGS.  7 (A) and  7 (B) mentioned below), and it is provided with a nozzle cover  14  to close or open the nozzle orifice  11 C. 
     The nozzle cover  14  is integrated with the second valve casing section  11  via a thin hinge section  14 B, and a protrusion  14 A is formed therein to plug the nozzle orifice  11 C. 
     Accordingly, the nozzle cover  14  can be swung around the thin hinge section  14 B fitting with the second valve casing  11  at one end, and when it is lowered, its protrusion  14 A comes into contact with the nozzle orifice  11 C and plugs the nozzle orifice  11 A, and when it is raised the protrusion  14 A separates from the nozzle orifice  11 C and opens the nozzle orifice  11 C. 
     The second valve casing section  11  includes an outside boss section  11 A of a large diameter and an inside boss section  11 B of a smaller diameter, between which the cylinder section  21  of the base body  2  is inserted with pressure, and the second valve casing section  11  is fitted into the base body  2 . 
     In other words, as the trigger structure  1  is pulled badk, the cylinder section  21  oscillates between the outside boss section  11 A and the inside boss section  11 B of the second valve casing section  11 . 
     Between the second valve casing section  11  and the cylinder section  21 , an anti-fall mechanism is provided as shown in the partial sectional view of FIGS.  3 (A) and  3 (B). 
     In other words, in order to prevent any possible falling off of the trigger structure  1  from the base body  2 , the outside boss section  11 A of the second valve casing section  11  is provided with an anti-fall mechanism. 
     The anti-fall off section is formed as a protrusion  11 A 1  which projects inwardly from the outside boss section  11 A, and protrusion  11 A 1  coming into contact with the protrusion  21 A on the periphery of the cylinder section  21  will prevent the trigger structure from falling off. 
     On the other hand, the base body  2  with the trigger structure  1  mounted thereon is fixed on the mouth of the vessel B via the packing structure  4  and forms a holding piece for the trigger section  12  when it is operated with a hand. 
     For this reason, the base body  2  includes cylinder section  21  for accommodating the piston section  3  and vent cylinder section  22  running parallel thereto for inserting, guiding and letting the trigger guide  13  oscillate. 
     The base body  2  also includes the proximal section  23  for fixing the first valve casing section  42 , and the first valve casing section  42  is inserted into this proximal section  23  and is fixed thereto. 
     This first valve casing section  42  includes the first valve  5  for opening and shutting the channel for the liquid flowing from the vessel into the cylinder section  21 . 
     In other words, the first valve  5  opens and shuts the channel between the proximal section  23  of the base body  2  and the second valve casing section  11  of another body. 
     At the bottom of the vent cylinder  22  a cruciform protrusion  24  is provided, and this helps to position a spring  8  outside. 
     This spring gives return force to the trigger structure  1  when the latter reciprocates. 
     On the other hand, the virgin seal section  9  provided with a cylindrical section  91  surrounding the trigger guide  13  is integrated with the tip of the vent cylinder section  22  via a thin metal  93 . 
     This virgin seal section is designed to prevent the pull back of the trigger structure  1 . 
     FIGS.  4 (A) and  4 (B) are enlarged views of a part of the virgin seal section  9 . 
     The cylindrical section  91  of the virgin seal section  9  includes a notch  91 A, and by pulling the handle  92 , the notch  91 A separates and the thin metal  93  is cut out. 
     Accordingly, as mentioned below, by cutting off the virgin seal  9 , it becomes possible to move the trigger structure  1  in relation to the vent cylinder section  22  of the base body  2 . 
     In other words, it becomes possible to pull the trigger section  12  of the trigger structure. 
     It should be noted in this connection that the handle  92  of the virgin seal section  9  is marked with a pattern showing the direction of the pull, for example an “arrow” as illustrated in the figures. 
     The first valve casing section  42  and the packing  41  are integrated to constitute the packing structure  4 , and thereunder a tubular body  7  constituting the channel sucking liquid from the vessel is fixed. 
     FIG. 5 is an illustration showing the packing structure. 
     The integration of the first valve casing section  42  and the packing  41  improves the convenience of positioning both of them. 
     The case wherein the first valve casing section  42 , the packing  41  and the tubular body  7  are integrated is illustrated in FIG.  6 . 
     In this case, the long tubular body  7  which is easy to hold improves the efficiency of assembly. 
     Thus, for the material of the packing structure  4  provided with a packing  41 , the adoption of a low density polyethylene (LDPE) is preferable. 
     The vent cylinder section  22  is designed to guide the trigger structure  1  to be able to displace along its axis in parallel to the cylinder section  21 . 
     The movement of the piston section  3  is very stable because the trigger guide section  13  moves simultaneously along the vent cylinder section  22 . 
     And the piston section  3  integrated with the trigger structure  1  moves in the same direction, and moreover oscillates between the outside boss section  11 A and the inside boss section  11 B while interpolating the cylinder section  21 . Therefore, it operates in a more stable manner. 
     In addition, the trigger structure  1  includes a notch for venting air (not illustrated) and provided in a part of the trigger guide  13 , and regulates the negative pressure in the vessel while the vent cylinder section  22  and the trigger guide section  13  are cut off. 
     The pump dispenser  4  according to this invention includes as components the trigger structure  1 , the base body  2 , the piston section  3 , the first valve  5 , the second valve  6 , the packing structure  4  (the first valve casing section  42  and the packing  41  being integrated), and the tubular body  7  totaling seven components altogether. When the tubular body  7  is integrated with the packing structure  4 , however, the number of components will be six in total. 
     As the number of components are fewer than those of the traditional manually operated trigger-type pump dispenser (traditionally, the piston, the trigger and the second valve casing are separate, and the first valve casing and the packing are separate), the number of assembly steps will be fewer and the production efficiency will improve. 
     As the material of the trigger structure  1 , the base body  2 , and the cap  10 , it is preferable to use polypropylene (PP), and as the material of the valves  5  and  6 , the piston section  3  and the packing structure  4 , it is preferable to use low density polyethylene (LDPE). 
     FIGS.  7 (A) and  7 (B) show the state in use of the pump dispenser A described above when the trigger section is pulled in after removing the virgin seal section. 
     To operate the trigger section  12 , as shown in the figure, two fingers F (for example, the index finger and the middle finger) should be used to hold the trigger section  12  and the bifurcation between the index finger and the thumb (here referred to as “the root of the thumb” for the sake of convenience) should be applied to the area behind the base body  2 . 
     To begin with, a new unused pump dispenser A should be made ready for use. 
     At first, the virgin seal section  9  should be cut off from the vent cylinder section  22  of the base body  2  by holding the handle  92  of the virgin seal section  9  (see FIG.  4 ). 
     Then, the nozzle cover  14  should be swung upward to liberate the nozzle orifice  11 C from the plugged state to the open state. 
     At this point, when short operations of pulling slightly the trigger section  12  of the trigger structure  1  are repeated many times, the liquid contained in the vessel is discharged into the cylinder section  21 , and the pump dispenser will be ready for regular use. 
     Then, the trigger structure  1  should be pulled strongly against the elastic force of the spring  8  while holding the pump dispenser A. 
     Then, the first valve  5  closes and the second valve  6  opens leading to the ejection of the liquid contained in the cylinder section  21  from the nozzle orifice  11 C. 
     Thereafter, when the trigger structure  1  is liberated, due to the reactionary force of the spring  8 , the trigger structure begins to return, and as a result the piston section  3  also starts returning to its original position. 
     And then, the first valve  5  opens and the second valve  6  closes creating a negative pressure in the cylinder section  21  and causing the liquid contained in the vessel to be sucked. 
     In the operation described above, by pulling two fingers, the pushing pressure for displacing the trigger structure  1  is dispersed between the trigger guide section  13  and the vent cylinder section  22  as well as between the piston section  3  and the cylinder section  21 . 
     As described above, the action of the spring  8  is supported by the trigger guide section  13  along the vent cylinder section  22  and therefore the motion of the spring  8  becomes very stable. 
     Moreover, since the trigger structure  1  reciprocates while the cylinder section  21  of the base body  2  is interpolated between the outside boss  11 A and the inside boss  11 B of the trigger structure  1 , a very stable linear displacement motion can be assured. 
     In addition, due to the provision of an anti-fall off mechanism as mentioned above between the trigger structure  1  and the base body  2 , in other words between the cylinder section  21  and the second valve casing section  11 , the two components do not inadvertently separate from each other. 
     On the other hand, as the nozzle orifice  11 C can be simply plugged by drawing down the nozzle cover  14 , safety is assured. 
     In the above preferred embodiment, the case wherein the virgin seal section is integrated with the top of the vent cylinder section via a thin metal while enclosing the trigger guide section is described (see FIG.  1 (B)). 
     The reason behind such arrangement is to prevent the pull back of the trigger structure in an unused new pump dispenser A. 
     Therefore, the virgin seal section need not be at the top of the vent cylinder section and can take another form provided that a similar operational effect can be obtained. 
     And the virgin seal section is designed for only one-time use. However, instead of cutting off the virgin seal, it is possible to adopt a mechanism of locking the trigger as described below so that it may be used repeatedly. 
     On the other hand, the measures taken to prevent the pull back of the trigger structure are taken in order to prevent any inadvertent leakage of liquid before the spring apparatus is used. Therefore, by blocking the passage of liquid in the pump dispenser, the leakage of liquid can be prevented with an even greater certainty. 
     Therefore, with reference to the drawings, the trigger lock section and the virgin seal in the pump dispenser (inside virgin seal) will be described by referring to their respective examples. 
     FIG. 8 is a schematic sectional view showing an example of a composition of a pump dispenser provided with a trigger lock section for locking the trigger. 
     The trigger lock section  9 A is integrated with the base body  2  via the hinge section  9 A 1  and is formed so that it can be swung upwards. 
     And before the spraying apparatus is put to use, as shown by a solid line, it is formed so that it may touch the rear end of the outside boss section  11 A of the second valve casing section  11 . 
     By making such an arrangement, any attempt to pull back the trigger structure before the spraying apparatus is put to use will be blocked by this trigger lock section  9 A, and any inadvertent pull back of the trigger structure  1  can be prevented. 
     And at the beginning of use, as shown in a chain line with two dots, by swinging upward the trigger lock section  9 A, the trigger structure  1  will be free of obstacles and can be pulled back freely. 
     And as shown in the figure once a cavity  9 B of a form befitting the trigger lock section  9 A that has swung down on the base body  2  is created, the trigger lock section  9 A can be accommodated therein, and the trigger lock section  9 A will not come in the way when the spraying apparatus is in use. 
     Incidentally, in this preferred embodiment, any components other than said trigger lock section  9 A may be designed in the same way as the preferred embodiment previously maintained. 
     And now the inside virgin seal will be described. 
     The inside virgin seal is designed to block the channel of liquid in the pump dispenser as described above. Specifically, when the trigger structure provided with a seal so as to block the channel of liquid is pulled back, the protruding shaft opens the inside virgin seal. 
     FIG. 9 shows an example of composition of a pump dispenser provided with an inside virgin seal and a protruding shaft. 
     The inside virgin seal  31 A is formed at the final end of the cylindrical body  31  of the piston section  3 , and blocks the opening mouth of the latter before the spraying apparatus is put to use. 
     And in the cylinder receptacle section  25  provided at the deepest end of the cylinder section  21 , a protruding shaft  26  is provided. 
     FIGS.  10 (A) and  10 (B) are enlarged views of the inside virgin seal, and FIG.  10 (A) is a partial cross-sectional view and FIG.  10 (B) is an end view of the virgin seal from the side of the protruding shaft. 
     The inside virgin seal  31 A is connected with the final end of the cylindrical body  31  via a thin metal  31 B surrounding its periphery. 
     Since this thin metal  31 B is weak in terms of physical strength, a thrust of the protruding shaft  26  described below suffices to easily cut off this part. 
     And since a part of the thin metal section  31 B is made thick (hinge section  31 C) and this hinge section  31 C is strong in terms of physical strength, it is not cut off and can keep the inside virgin seal  31 A linked with the cylindrical body  31 . 
     FIG. 11 is a sectional view showing the state of the pump dispenser when the spring apparatus has been put to use and the trigger structure is pulled back. 
     When the trigger structure  1  is pulled back, the cylindrical body  31  of the piston section  3  is inserted into the cylinder receptacle  25 , and in this state a thrust of the protruding shaft  26  causes the inside virgin seal  31 A to fall down and opens the mouth. 
     FIG. 12 is a schematic sectional view showing the inside virgin seal opened by a thrust of the protruding shaft. 
     The inside virgin seal  31 A is placed under pressure from the thrust of the protruding shaft  26  leading to the cutting off of the thin metal part  31 B. 
     However, the hinge section  31 C is not broken, and the inside virgin seal  31 A swings down around this hinge section  31 C and is opened. 
     If the top end of the protruding shaft  26  is made conical or spherical as shown in the figure, it will facilitate the catching of the seal  31 A by the top end and therefore such an arrangement will be preferable. 
     Now for the reference of the reader, a pump dispenser provided with the virgin seal section  9  and the inside virgin seal shown in the first preferred embodiment will be illustrated in FIG. 13, and a pump dispenser provided with the trigger lock section  9 A and the inside virgin seal will be illustrated in FIG.  14 . 
     We have thus far described this invention, but this invention is not limited to said preferred embodiments, and various variations are possible within the limits of this invention. 
     For example, the form of virgin seal section is not limited to a circular configuration, and variations can be made as necessary. 
     Also the pump dispenser A may be mounted on many types of vessels. 
     As shown in FIG. 15, by adopting a nozzle cover  14 , it is possible to eject liquid in the form of foam. 
     To be more specific, by adopting a nozzle cover  14  provided with a mesh section  14 C and by letting the liquid ejected from the nozzle orifice pass through the mesh section  14 C, the ejection will be foamy. 
     In this case, it is preferable to provide a nozzle stopper  15  between the nozzle cover  14  and the nozzle orifice for closing the nozzle. 
     Therefore, when the pump dispenser is put to use, in the first place the nozzle cover  14  is opened, the nozzle stopper  15  is removed, and then the nozzle cover  14  is closed for use. 
     And as shown in FIG. 16, the downward sloping extension of the outside boss section  11 A of the second valve casing  11  can be integrated with the nozzle cover  14 . 
     Incidentally, in this case, the extension section can be made into a nozzle adapter separate from the second valve casing section  11 . 
     By giving a downward inclination degree of θ, for ejecting the liquid downward there will be no need to incline downward the whole pump dispenser including the vessel (in other words, the whole spraying apparatus). 
     Since this arrangement avoids the development of momentum due to the weight of the vessel filled with liquid, no material burden is applied on the hands and the pump dispenser made according to this arrangement will be easy to use. 
     Although particular preferred embodiments of the invention have been disclosed in detail for illustrative purposes, it will be recognized that variations or modifications of the disclosed apparatus, including the rearrangement of parts, lie within the scope of the present invention.