Liquid jet blower

Abstract: This invention relates to a liquid jet blower that operates as an aerosol sprayer without using any pressurized gas. This invention is intended to provide a liquid jet blower which is free from clogging of the nozzle and undesired flows of the liquid outside its container. To that end, means are provided for relieving any excessive pressure within its pressure chamber and transferring any remaining liquid to a small chamber specifically arranged within the blower.

Description: TECHNICAL FIELD This invention relates to a pressurized liquid jet blower that operates as an aerosol sprayer without using any pressurized gas. The present invention relates not only to a sprayer-type blower but also to a jet blower that discharges its content in the form of liquid or foam without reducing it into fine particles. BACKGROUND ART Japanese Patent Disclosure, or Tokkou Shou No. 57-20024 teaches a pressurized liquid jet blower of a type comprising a container, a main tube arranged in said container, a sliding tube arranged within said main tube and a tubular cap fitted to the upper portion of the outer periphery of said tube, wherein the liquid in the container is taken into a pressure chamber by way of liquid intake paths defined by the lower portion of the tube and that of the sliding tube and pressurized in the chamber by rotating the tubular cap to push up said sliding tube against the force applied to it and urging it downward and thereafter said pressurized liquid is blown out of a nozzle in a jet stream by pushing downward an actuator running through the top of said tubular cap and projecting out of it to open a discharge valve disposed at the bottom of said actuator in a valve box that is located below the upper surface of the tubular cap and communicates with the pressure chamber. Document FR-A-2 181 347 discloses a further pressurized liquid jet blower. While a known pressurized liquid jet blower as described above is advantageous in that the liquid contained in it can be discharged simply by pushing down the actuator with a finger tip as the liquid in the container is partly introduced into the pressure chamber in advance and stored there under pressure, the liquid agent remaining in the discharge path of the actuator can be dried to become solid particles that can eventually clog the discharge path. Besides, while the known pressurized liquid jet blower is provided with a number of means for preventing the liquid from unintentionally coming out under pressure from the pressure chamber and falling along the outer surface of the blower particularly after the actuator is released, they do not necessarily satisfactorily operate and leave room for improvement. Particularly, since the above described known pressurized liquid jet blower is so devised that any excessive pressure remaining in the jet blower is relieved through a through bore provided at the top of the tube, some of the liquid in the main tube can come out under pressure through the bore during the operation of relieving the excessive pressure to adhere the inner surface of the barrel of the container above the liquid contained in it. The mechanism of relieving excessive pressure of the blower is not aesthetically recommendable, and, the customer can easily become uncomfortable with the blower once he or she experiences such a trouble with it. Also, since the mechanism of relieving excessive pressure of the blower is arranged independently from its air inlet valve, the tube has a rather complicated configuration. DISCLOSURE OF THE INVENTION It is therefore the object of the present invention to provide an improved liquid jet blower which is free from at least one of the above described problems. According to the invention, there is provided a liquid jet blower comprising a container (201), a main tube (202) arranged in said container, a tubular cap (220), a sliding tube (210) to be vertically and slidingly moved by rotating said tubular cap (220), said tubular cap (220) and said sliding tube (210) being urged downward and fit into said main tube (202), a pressure chamber (219) having a liquid suction path and defined by a first cylinder constituted by a lower portion of the main tube (202) and a lower portion of the sliding tube, a valve box rigidly fitted to the inside of an upper portion of said tubular cap (220), said pressure chamber (219) and said valve box being kept in communication with each other, and an actuator (245) projecting upward from the valve box through the top of the tubular cap (220), the liquid in said pressure chamber (219) being blown out of a nozzle arranged in said actuator (245) by pushing down said actuator (245), wherein it further comprises a pipe member (240) whose upper edge is fitted into a groove (233) formed on the periphery of the lower surface of the top wall (232) of said tubular cap (220) in such a manner that a pipe section (242) projecting downward from the inwardly flanged bottom of a second cylinder (241) formed by the upper portion of said pipe member (240) and used for the valve box provides a path for communicating the inside of said second cylinder (241) and said pressure chamber (219), a third cylinder (246) which is loosely fitted in the second cylinder (241) below the actuator (245) and provided with a stem (247) standing upward from it by way of a shoulder section, a push-down head (248) which is provided with a nozzle and an inner tube (249) and arranged around said stem in such a manner that the inner tube is tightly fitted to the outer surface of the upper portion of said stem and the head itself is urged upward, a tubular valve body (251) which is airtightly arranged around the outer peripheral surface of said stem between said third cylinder (246) and said inner tube (249) in such a manner that it is held between said shoulder section and the lower surface of the top of the tubular cap and can be slidingly moved downward when pushed by the lower end of the inner tube (249) and upward when pushed by the upper end of the shoulder section and its outer peripheral surface is in close contact with the inner peripheral surface of the second cylinder, a piston member (257) which is provided with a rod section (256) having a conduit (255) and projecting downward into said pipe section (242) and fitted into said third cylinder (246), and a discharge valve hole (250) arranged at the bottom of the stem. When the tubular cap (220) of a liquid jet blower having a configuration as described is rotated relative to the main tube (202), the balls (217) are pressed downward and moved from the upper end of the vertical groove section (215) into the inclined groove section (214) of the respective cam grooves (2169 so that the sliding tube (210) is pulled up relative to the main tube (202) and consequently the volume of the pressure chamber (219) is increased to open the suction valve (203) and attract the liquid in the container into the pressure chamber. At this stage, since the balls (217) are located at the bottom of the vertical groove section (215) of the respective cam grooves and the sliding tube (210) is pushed by the first spring (225) and moved downward, additional pressure is applied to the liquid in the pressure chamber. If the push-down head (248) is depressed under this condition, the actuator (245) is firstly lowered leaving the tubular valve (251) in position and thereafter the tubular valve (251) is moved downward as it is pushed by the lower end of the inner tube (249) of the push-down head (249) as seen from the left half of Fig. 12. As the actuator (245) is lowered, the discharge valve hole (250) located at the -lower end of the stem (247) becomes open so that the pressurized liquid is blown out from the nozzle by way of the pipe section (242), the conduit (255) and the space between the second cylinder (241) and the third cylinder (246). When the push-down head (248) is released, the second compression spring (258) is pressed downward as illustrated in the right half of Fig. 12 to raise the actuator (245) so that the upper surface of its shoulder section comes to abut the tubular piston and close the discharge valve hole (250). As the actuator is raised further, its tubular valve (251) comes to abut the lower surface of the top of the tubular cap (220) where it stops its movement. As the actuator is kept on moving at least for a while after the closure of the discharge valve hole, the volume of the third cylinder (246) located above the piston (257) is increased to generate a negative inner pressure that takes up the liquid left within the nozzle. Now the present invention will be described in greater detail by referring to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a half sectional view of a liquid jet blower, Fig. 2 is a half sectional view of the liquid jet blower showing a condition where the actuator tube is set to an upper position, Fig. 3 is a perspective view of a principal area of the actuator showing it is partly torn off, Fig. 4 is a perspective view of the elastic disc, Fig. 5 is a sectional view of a part of the liquid jet blower showing a condition where the elastic disc is being lowered, Fig. 6 is a sectional view similar to Fig. 5 showing a condition where the elastic disc is being raised and Fig. 7 is a sectional view similar to Fig. 5 showing a condition where the elastic disc is set to its lowermost position. Fig. 8 is a longitudinal sectional view of a liquid jet blower showing in the left half a condition where it is not used and in the right half a condition where it is used for blowing the liquid contained in it, Fig. 9 is a longitudinal sectional view of the injection button of the injection valve of the liquid jet blower, Fig. 10 is a side view of the liquid jet blower showing its principal area is partly torn off and Fig. 11 is an unfolded schematic view of the cam groove of the liquid jet blower. Fig. 12 is a sectional view of a principal area of a liquid jet blower showing in the right half a condition where the actuator is being raised and in the left half a condition where the actuator is being lowered, Fig. 13 is a sectional view showing a condition where the sliding tube is being raised and Fig. 14 is an unfolded schematic view of the cam groove. Fig. 15 is a sectional view of a liquid jet blower showing a condition where the sliding tube is set to its lowermost position, Fig. 16 is a sectional view similar to Fig. 16 showing a condition where the sliding tube is set to its uppermost position and Fig. 17 is an unfolded schematic view of the cam groove. In Figures 1 to 7, reference numeral 1 denotes a container and reference numeral 2 denotes a main tube having a cylinder 4 projecting downward and provided at its lower end with a suction valve 3. An upper tube 5 is standing upward from an outward flange arranged on the upper end of the cylinder. A threaded tube 6 which is fitted to the neck portion of the liquid jet blower is suspending from the middle of said upper tube with said outward flange interposed therebetween. A large engaging disc 7 is arranged slightly above the threaded tube 6 and a number of first engaging ridges 8 are circularly arranged thereabove, while a number of longitudinal grooves 9 are arranged on the inner peripheral surface of the upper portion of the upper tube and spaced apart regularly from adjacent ones. A through bore 10 is formed through the top of the cylinder 4 and resiliently closed at its top by an elastic valve plate 11, said through bore 10 and said elastic valve plate 11 constituting an anti-negative pressure valve 12. The bottom of the upper tube located above the through bore is provided along the peripheral area of its inner surface with a first sealing ridge 13 which, when covered by a rubber packing ring, comes to airtightly contact with the outer peripheral surface of a tubular plunger, which will be described later, whereas the bottom of the cylinder is provided along the periphery area of its inner surface with a first groove 14. Said first groove may be alternatively arranged on the outer peripheral surface of the lower portion of the cylinder. Still alternatively, the groove may be replaced by a number of grooves spaced apart from adjacent ones. A suction pipe 15 projects downward from the bottom of the cylinder. Reference numeral 20 denotes an actuator tube provided at its lower portion with a tubular plunger 21. A cam tube 23 is standing from the tubular plunger by way of an outward flange arranged on the upper end of the plunger and provided with cam grooves 22 each including an inclined groove section 22a and a vertical groove section 22b, which is continuously extended from the inclined groove section as seen from Fig. 3. Said cam tube is provided on its inner surface with a first group of longitudinal grooves and ridges 24. The upper half of a ball 23a is fitted into the lower end of each of the longitudinal grooves 9, while the lower half of the ball 23a is fitted into the corresponding one of the cam grooves 22. A plunger ring 25 carries on its O-shaped bottom plate an inner tube and an outer tube respectively standing upward from its inner periphery and its outer periphery and is fitted into the lower end of the tubular plunger 21, which lower end is provided with a second sealing ridge 26 arranged around it. The tubular plunger and the cylinder are so designed that the outer peripheral surface of the former and the inner peripheral surface of the latter are slightly spaced apart from each other while the outer periphery of the second sealing ridge airtightly contacts with the inner peripheral surface of the cylinder. It should be noted that, when the second sealing ridge 26 is placed within the first groove 14 as illustrated in Fig. 1, the pressure chamber of the cylinder and the through bore 10 are in communication with each other by way of the first groove 14 and said small space between the tubular plunger and the cylinder as described above so that any excessive pressure in the pressure chamber may be relieved out of the container 1 by way of the anti-negative pressure valve 12. It should also be noted that the tubular plunger 21 is provided on the outer peripheral surface of its lower portion with a second groove 27 so that, when the tubular plunger is raised until said first sealing ridge 13 is received by the second groove 27, ambient air may enter the container by way of the space between the cam tube 23 and the upper tube 5, the second groove 27 and the anti-negative pressure valve 12. The cylinder 4 and the tubular plunger 21 constitute a pressure device to be used for sucking liquid. As shown in Figs. 5 through 7, said tubular plunger 21 is provided on the outer peripheral surface of its upper portion with a third groove 28, which receives the inner periphery of a bored elastic disc 29 in such a manner that said bored elastic disc 29 is vertically movable within the groove and its outer periphery contacts with the inner surface of the upper tube 5. Said bore elastic disc 29 is also provided with a notch 30 at the outer periphery and a continuous small groove is formed on the upright wall section and the lower flat wall section of the third groove. The elastic disc 29 is so arranged that its upper surface is kept in contact with the lower surface of the outward flange 20a except the outer periphery of said elastic disc when the actuator tube 20 is being lowered and therefore the air contained in a space defined by the elastic disc 29, the inner surface of the upper tube located below the disc 29 and the outer surface of the tubular plunger provides an air cushion having an air outlet when the tubular plunger is lowered. The air outlet is defined by said notch 30 and said small groove. The outer tube 40 is rotatively fitted to the outer periphery of the upper portion of said upper tube 5. Said outer tube is constituted by an inner tubular member and an outer tubular member, the inner tubular member 40a comprises a first engaging tube 41 and a second engaging tube 42 projecting downward respectively from the outer periphery and the inner periphery of its top having the shape of a bored disc. The first engaging tube has on its inner peripheral wall a second circumferential ridge 43 which abuts the lower surface of the first circumferential ridge 8 arranged on the outer peripheral wall of the upper tube. The second engaging tube has on its outer peripheral surface a second group of vertical grooves and ridges 44, which are engaged with the first group of vertical grooves and ridges 24 arranged on the inner surface of the cam tube 23 so that the second engaging tube and the cam tube may not rotate relative to each other. The outer tube further comprises a third engaging tube 45 standing upright from the upper surface of its bored disc-shaped top. Said third engaging tube 45 is engaged with the outer tubular member and has a group of vertical grooves arranged on its outer peripheral wall. The outer tubular member 40b has on its inner peripheral surface a circumferential groove that rotatively receives the outer periphery of the engaging disc 7. The top of the outer tubular member 40b is rounded. A fourth engaging tube 47 is suspending from the inner periphery of the top in such a manner that its lower portion is fitted to the outer peripheral surface of said third engaging tube 45, while a fifth engaging tube having a plurality of ribs arranged on its inner peripheral surface is standing upward from the top of the outer tubular member in such a manner that the outer periphery of the valve box 56 of a valve assembly, which is described later, is held between the lower ends of said ribs and the top of the third engaging tube 45. A spring 50 is disposed between the lower surface of the bored disc-shaped top of said inner tubular member 40a and the upper surface of the outward flange 20a of the actuator tube 20 so that the actuator tube 20 is constantly urged downward. The valve assembly 55 comprises, besides said valve box 56, a discharge pipe 57 projecting downward from said valve box 56 and airtightly connecting said valve box and the pressure chamber in the cylinder through the tubular plunger 21, a stem 58 standing upward from the valve box 56 and a head 60 having a nozzle 59 and fitted to the top of the stem 58. The discharge valve of the valve box 56 may have a configuration as shown in Fig. 18 or Fig. 19. When the head 60 is depressed while the inside of the pressure chamber is under pressure, the stem 58 is lowered into the valve box to open the discharge valve in the valve box so that the liquid in the pressure chamber is blown out of the nozzle 59 under pressure. In order to take liquid into the pressure chamber, the outer tube 40 is rotated clockwise relative to the container 1 so that the actuator tube 20 is raised by the cam mechanism against the biasing force applied to it to reduce the pressure of the inside of the pressure chamber under negative pressure and let the liquid goes into the container through the suction pipe 15 and the suction valve 3. Under this condition, the balls 23a move to the lower ends of the respective inclined groove sections 22a of the cam grooves 22, which correspond to the related vertical groove sections 22b as illustrated in Fig. 3. Thus, since the actuator tube 20 is lowered gradually as a function of the decrease of the volume of the liquid in the pressure chamber caused by liquid injection, the liquid in the pressure chamber is kept constantly under high pressure so that it may blow out each time the discharge valve is opened. While it may seem that the liquid loses its energy to blow out because of the reduction of pressure in the pressure chamber when the actuator is lowered close to its lowest position, such a condition is prevented from occurring by the second sealing ridge 26 located in the second groove 14 that moves any remaining pressure into the container and, therefore, the discharge of liquid immediately stops. The negative pressure in the pressure chamber caused by the reduction of the volume of the liquid there is compensated by the ambient air that comes into the chamber through the space between the outer peripheral surface of the actuator tube above the second groove and the inner peripheral surface of the main tube, the second groove and the negative pressure rod valve 12 as the actuator is raised and the second groove 27 is moved toward the inside of the first sealing ridge 13. With the liquid jet blower having a configuration as described above, where an anti-negative pressure valve 12 and a first grove 14 are arranged respectively on the top of the cylinder and on the inner peripheral surface near the bottom of the cylinder and a second sealing ridge 26 is arranged at the bottom of the tubular plunger 21 so that any pressure remaining in the pressure chamber is relieved out of the container through the first groove, the space between the inner peripheral wall of the cylinder and the tubular plunger and the anti-negative pressure valve 12 once the second sealing ridge 26 is placed in the first groove 14, no liquid will accidentally flow out of the container after use and the discharge pipe 57 does not need to be taken out of the plunger ring 25 fitted to the bottom of the tubular plunger as in the case of a known liquid jet blower, which makes the inner surface of the plunger ring free from damage and defective sealing due to friction and collision between the bottom of the discharge pipe and the inner surface of the plunger that may occur each time when the discharge pipe is taken out of the plunger ring. If a first sealing ridge 13 is arranged on the inner surface and near the bottom of the upper tube 5 above the through bore 10 in such a manner that it airtightly contacts the outer surface of the tubular plunger and a second groove 27 is arranged on the outer surface near the bottom of the tubular plunger in such a manner that ambient air is allowed to enter the container 1 by way of the second groove 27 and the anti-negative pressure valve 12 when the tubular plunger 21 is brought to its uppermost position, the overall anti-negative pressure mechanism of the container can be simplified without degrading its function and, at the same time, it may be used for both prevention of negative pressure and relief of the remaining pressure. Furthermore, if a third groove 28 is horizontally arranged on the outer peripheral surface of the upper portion of the tubular plunger to receive the inner peripheral edge of a bored elastic disc 29, whose outer peripheral edge is brought to contact with the inner surface of the upper tube to form an air cushion having an air outlet and defined by the inner surface of the upper tube 5 located below said bored elastic disc and the outer surface of the tubular plunger, any fall of the main tube 2 to be effected when no liquid is introduced into the pressure chamber will take place without crash noise. Finally, if the outer tube 40 is constituted by an inner tubular member 40a and an outer tubular member 40b fitted to said inner tubular member and having a second groove 43 horizontally arranged on the inner peripheral surface and near the bottom of the first engaging tube 41 of the inner tubular member and rotatively engaged with the lower surface of the first groove 8 of the upper tube 5, while the second group of grooves and ridges 44 vertically arranged on the outer surface of the second engaging tube 42 of the inner tubular member are respectively engaged with the second group of grooves and ridges 24 of the cam tube 23 standing from the top of the cylinder in such a manner that the second engaging tube 42 and the cam tube are vertically slidable relative to each other, the engagement of the cam tube and the outer tube will not become loose unlike the case where the cam tube is screwed to a part of the outer tube and therefore liable to be unscrewed from the latter and the outer periphery of the valve box 56 of the valve assembly may be held between the top of the inner tubular member 40a and the inner surface of the upper portion of the outer tubular member 40b to simplify the overall configuration of the valve assembly. Fig. 8 shows the arrangement, in cross section, of the aerosol type injection valve and the related components of a liquid jet blower. The injection valve comprises a valve box 101, an injection pipe 102 and an injection button 103. The valve box 101 has a cup-shaped box body 113 and a connector pipe 114 arranged through the center of the bottom of the box body to connect the valve box and the liquid intake and pressure system (not shown) of the jet blower main body and keep them in communication with each other. A number of legs 115 which are regularly spaced apart from adjoining ones in the box body 113 are standing respectively on bores arranged around the opening for the connector pipe to support a pedestal 116, over which a table 106 provided with an elastic outer peripheral wall 105 is fitted. Besides, a bored doughnut-like gasket 104 having a through bore running along its axis is arranged around an opening formed through the top of the box body 113 and is rigidly held by a pair of bored keep plates 117, 118 arranged respectively on the upper and lower surfaces of the gasket 104. The injection pipe 102 has a thinned pipe portion with a small diameter 107 running through the gasket 104 and projecting outward and upward from the inside of the valve box 101 and an enlarged lower pipe portion with a large diameter 108 having its bottom airtightly abutting said elastic peripheral wall 105. The enlarged pipe portion 108 is provided at its lower end with notches 119 which are spaced apart from adjacent ones, while the thinned pipe portion 107 is provided on its side at an area that contacts with the gasket 104 with a communicating hole 110 and on the outer surface at the middle of the area projecting from the outward and upward from the valve box with a large stopper 120. The injection pipe 102 is constantly urged upward by a pusher coil spring 109 arranged around the outer surface of the enlarged pipe portion 108 so that a small chamber 111 is formed between said enlarged pipe portion 108 and the upper surface of said table 106 as long as the injection pipe 102 is biased upward. Said communicating hole 110 is normally closed by the side wall of the gasket 104, although it comes to open for the valve box 101 when the gasket 104 is pushed down for injection of liquid. As shown in Fig. 9, the injection button 103 is provided with a nozzle cap 121 which is realized in the form of a sidewise cap hold a nozzle 112 in the center of it and disposed in the injection button. A spin groove 122 is arranged behind the nozzle cap 121 in communication with the nozzle 112 and a peripheral groove 123 is arranged behind the spin groove 122 in communication therewith in such a manner that the lowest portion of the peripheral groove 123 connected with the upper portion of the injection pipe 102 by way of a liquid path 124 and therefore communicates with said injection pipe 102. Thus, when the injection button is depressed downward, the injection pipe 102 is brought downward with the injection button to open the communicating hole 110 for the valve box 1 so that the liquid intake and pressure system located in the lower portion of the jet blower main body comes to be communicated with the injection button 103 by way of the valve box 101, the communicating hole 110 and the injection pipe 102 and consequently the pressurized liquid in the container is blown out of the nozzle 112 in fine particles. Once, however, the injection button 103 is released, the injection pipe 102 is pushed up by the pusher spring 109 to the normal position and a small chamber 111 is formed within the enlarged pipe portion 108 to attract a certain amount of the liquid remained in the container into the small chamber 111 and lower the level of the remaining liquid so much that the nozzle 112 may be free from clogging due to the liquid which is otherwise left at or near the nozzle 112. Now, the liquid intake and pressure system in the jet blower main body will be described, although it may be configured in an appropriate manner. Figs. 10 and 11 shows a manually operated system that can minimize the possibility of contaminating the atmosphere. In Figs. 10 and 11, reference numeral 125 denotes the container main body, 126 a cylinder screwed into the neck 127 of the container main body 125 and projecting downward into the upper portion in the inside of the container main body 125, 128 a suction valve arranged at the bottom of the cylinder 126, 129 a suction pipe suspending from the lower end of the cylinder 126 into the lower portion in the inside of the container main body 125, 130 a pipe suspending from the axial core of the cylinder 126 and having its upper end connected to said connector pipe 114 in communication therewith, 131 a plunger tightly and slidably fitted to the inner surface of the cylinder 126, 132 a movable valve rigidly fitted to the lower end of the plunger 131 to shut off the inside of the cylinder 126 around the pipe 130 and to make the lower portion of the inside of the cylinder 126 into a pressure chamber A, 133 a sliding tube integrally formed with the plunger 131 and standing upright from the upper end of the plunger 131, 134 a rotary tube fitted to an engaging tube 136 standing from the top of said cylinder 126 by means of a fitting peripheral wall 135 and vertically slidably fitted to said sliding tube 133 and 137 a pusher spring to constantly urge said plunger downward. The aerosol type injection valve B as described earlier is built into the top of the rotary tube 134. More specifically, a rotary head 138 is integrally formed with the injection valve B and projecting outward and downward from the top of the valve box 101. Said rotary head 138 is arranged around the engaging tube 136 and rotatively fitted to the outer surface of its peripheral wall 135 and carries in it an inner tubular member 139 which is only longitudinally slidable relative to said rotary tube 134. Thus, the rotary tube 134 and the sliding tube 133 can be rotated with the rotary head 138 by rotating the latter. The sliding tube 133 and the engaging tube 136 constitute a cam mechanism 141 with balls 140 arranged therebetween. In other words, a zigzag cam groove 144 having inclined groove sections 142 and vertical groove sections 143 as illustrated in Fig. 11 is formed on the outer surface of the sliding tube 133, while a set of longitudinal grooves 145 are formed on the inner surface of the engaging tube 136 in such a manner that a half of each of the balls 140 is received in one of the grooves 145 and the other half of the ball is received in the cam groove 144. Reference numeral 146 denotes a cap. With a jet blower provided with cam mechanism having a configuration as described above, the rotary head 138 is rotated in a given direction for jet blowing. As the rotary motion of the rotary head 138 is transmitted to the sliding tube 133 by way of the rotary tube 134, the rotary force is converted by the inclined groove sections 142 of the cam mechanism 141 into a force to push up the sliding tube 133 and the plunger 131 against the resilient force of the spring 137 trying to push down them. As the plunger 131 is pushed up, the pressure in the pressure chamber A becomes negative to open the suction valve 128 and attract the liquid in the container 125 into the pressure chamber A. When the sliding tube 133 reaches its uppermost position along the inclined groove sections 142, the balls 140 are located on the vertical groove sections 143 of the cam groove 144 and the sliding tube 133 is pushed down by the spring 137 to increase the pressure applied to the liquid in the pressure chamber A so that the liquid remains under pressure in the chamber. If, under this condition, the injection button 103 is depressed to open the injection valve 102, the liquid in the pressure chamber A is driven out from there under pressure, passes through the pipe 130, the valve box 101 and the injection pipe 102 and blown out in fine particles from the nozzle 112 of the injection button 103. As the liquid is ejected from the chamber, the plunger 131 is lowered by the resilient force of the coil spring 137 to constantly apply pressure to the liquid in the pressure chamber A so that the liquid will be driven out from there so long as the injection button 103 is kept depressed. Since the above described jet blower is realized in the form of a handy jet blower having an aerosol type injection valve B and comprises an opening at the lower end of the injection pipe 102 of the injection valve B arranged in such a manner that a small chamber 111 that communicates with said opening is formed within the valve box 101 when the injection valve is returned to its normal position to attract any liquid remaining in the container into the small chamber 111 by way of the opening of the injection pipe 102 and consequently lower the level of the remaining liquid under the nozzle 112, the nozzle 112 is completely free from clogging due to dried particles of the liquid. In Figures 12 to 14, reference numeral 201 denotes a container, 202 a main tube from which a first cylinder 204 having a suction valve 203 is projecting downward. An upper tube 205 is standing upward from an outward flange arranged on the top of the cylinder. Said main tube is also provided with a screwed tube 206 arranged on its outer surface of the upper tube and screwed to a neck portion of the container. Said upper tube 205 is provided with a plurality of longitudinal grooves 207 arranged on its inner surface and regularly spaced apart from any adjacent ones. Said sliding tube 210 is vertically and slidably arranged within said main tube 202. The lower half of said sliding tube is formed to be a tubular plunger 211, which is fitted to the inside of the first cylinder 204 and has a cam tube 213 standing from its top with an outward flange 212 arranged therebetween, said cam tube 213 being fitted to the inside of the upper tube 205. The cam tube 213 is provided with a continuous cam groove 216 having inclined groove sections 214 and vertical groove sections 215 which are alternatively arranged as illustrated in Fig. 14. A number of balls 217 are fitted into the cam groove 216, a half of each of the balls being received in the cam groove and the other half being received by a corresponding one of said vertical grooves 207 so that, if the sliding tube 210 is rotated relative to the main tube 202, it is vertically reciprocated while it is being rotated. The cam tube is provided with a plurality of first vertical engaging grooves 218 and the tubular plunger 211 and the first cylinder 204 constitute a pressure chamber 219. A tubular cap 220 is rotatively fitted to the outer surface of the upper tube 205. Said tubular cap preferably comprises an inner tubular member 220a and an outer tubular member 220b as illustrated in Fig. 13. The inner tubular member comprises a first engaging tube 222 provided on its outer surface with first engaging ridges 221 that come to be vertically and slidably engaged with the respective first engaging grooves 221 and a second engaging tube 224 suspending from the outer periphery of the bored top 223 of said first engaging tube 222 and rotatively fitted to the outer peripheral surface of the upper portion of the upper tube 205. The first compression spring 225 being arranged between the lower surface of the inner periphery of said bored top and the outward flange of the sliding tube, a third engaging tube 227 being standing from the upper surface of said bored top and provided with second vertical engaging ridges 226 on its outer peripheral surface. The outer tubular member 220b has an actuator receiving hole 228 at the center of its top wall and a peripheral wall 229 projecting outwardly and downwardly from the outer periphery of the top wall and rotatively fitted to the outer surface of the upper tube 205. The outer tubular member 220b further comprising a fourth engaging tube 230 suspending from the inside of the top of the peripheral wall 229 and having second engaging grooves 231 arranged on its inner peripheral surface, said second engaging ridges 226 being engaged with the respective second engaging grooves 231 so that said inner tubular member 220a can be rotated by rotating the outer tubular member 220b. The top wall 232 of the tubular cap is provided on its lower surface and at the inside of the fourth engaging tube 230 with a circular groove 233 that faces downward. The circular groove 233 receives the top of a tubular member 240. Said member comprises a second cylinder 241 which is constituted by its upper portion and functions as a valve box and a tube 242 suspending from the inner periphery of its bored bottom which is realized in the form of an inward flange arranged at the bottom of said second cylinder and fitted into the tubular plunger 211 which is described earlier. The lower half of the tube 242 has a diameter smaller that of the upper half so that it airtightly contacts the inner surface of the tubular plunger by way of a plunger seal 281 in such a manner that the tubular plunger is vertically movable around said lower half. The lower portion of actuator 245 is fitted into the second cylinder 241. Said actuator comprises a stem 247 standing from the top of a third cylinder 246 with a shoulder therebetween and a pusher head 248 provided with a nozzle at the top and an inner tube 249, into which the top of said stem is fitted. The stem has a discharge valve hole 250 at the bottom. The outer diameter of said inner tube 249 is such that it can vertically move through a through bore of said actuator. A tubular valve 251 is fitted to the outer surface of the stem between the shoulder of said actuator 245 and the lower end of said inner tube 249 in such a manner that the actuator can be raised by pushing up the shoulder and lowered by pushing down the lower end of the inner tube 249 and that its outer peripheral surface is slidable on the inner surface of the second cylinder 241. As illustrated in the left half of Fig. 12, said tubular valve is held between the shoulder and the lower surface of the top wall 232 of the outer tubular member 220b when the actuator. 245 is raised. The discharge valve hole 250 is closed when the tubular valve is in contact with the upper surface of the shoulder of the actuator and opened when the tubular valve is moved away from the shoulder as illustrated in the left half of Fig. 12. The upper portion of said tubular member 240 is designed to receive a rod 256 having a fluid conduit groove 255. Said rod comprises a piston 257 which is constituted by its upper portion and fitted into the third cylinder 246. A second compression spring 258 is disposed between said piston 257 and a stepped area arranged on the inner surface of the stem 247 and facing downward so that the actuator 245 is constantly urged upward. With the liquid jet blower having a configuration as described above, since the third cylinder 246 continues to go up for some time after the discharge valve 250 is closed in order to bring the inside of the third cylinder under negative pressure, the liquid left in the nozzle, if any, is drawn back into the cylinder and consequently the nozzle is completely free from clogging that can be caused by dried liquid within the nozzle. Therefore, this liquid jet blower is effective in terms of anti-clogging effects. This liquid jet blower has a tubular member 240 whose top is fitted into a circular groove 233 arranged on the lower surface of the top 232 of the tubular cap 220 so that the tube 242 projecting downward from the bottom of the inward flange of the second cylinder 241, which is formed by the upper portion of said tubular member and serves as a valve box, provides a communication route that connects the inside of the second cylinder and that of the pressure chamber 219. With such an arrangement and configuration of the tubular cap 220, it can be prepared with utmost ease. Moreover, since the piston 257 fitted into the third cylinder 246 is integrally formed with the rod 256 having a fluid conduit groove 255, it can be mounted to the entire assembly very easily. In Figures 15 to 19, reference numeral 301 denotes a container, 302 a main tube from which a first cylinder 304 having a suction valve 303 is projecting downward. An upper tube 305 is standing upward from an outward flange 305a arranged on the top of the cylinder. Said main tube is also provided with a screwed tube 306 arranged on its outer surface of the upper tube and screwed to a neck portion of the container. Said upper tube 305 is provided with a plurality of longitudinal grooves 307 arranged on its inner surface and regularly spaced apart from any adjacent ones. Said sliding tube 310 is vertically and slidably arranged within said main tube 302. The lower half of said sliding tube is formed to be a tubular plunger 311, which is fitted to the inside of the first cylinder 304 and has a cam tube 313 standing from its top with an outward flange 312 arranged therebetween, said cam tube 313 being fitted to the inside of the upper tube 305. The cam tube 313 is provided with a continuous cam groove 316 having inclined groove sections 314 and vertical groove sections 315 which are alternatively arranged as illustrated in Fig. 17. A number of balls 317 are fitted into the cam groove 316, a half of each of the balls being re ceived in the cam groove and the other half being received by a corresponding one of said vertical grooves 307 so that, if the sliding tube 310 is rotated relative to the main tube 302, it is vertically reciprocated while it is being rotated. The cam tube is provided with a plurality of first vertical engaging grooves 318. The tubular plunger 311 and the first cylinder 304 constitute a pressure chamber 319. A tubular cap 320 is rotatively fitted to the outer surface of the upper tube 305. Said tubular cap preferably comprises an inner tubular member 320a and an outer tubular member 320b. The inner tubular member comprises a first engaging tube 322 provided on its outer surface with first engaging ridges 321 that come to be vertically and slidably engaged with the respective first engaging grooves 321 and a second engaging tube 324 suspending from the outer periphery of the bored top 323 of said first engaging tube and rotatively fitted to the outer peripheral surface of the upper portion of the upper tube 305, a first compression spring being arranged between the lower surface of the inner periphery of said bored top and the outward flange of the sliding tube, a third engaging tube 327 being standing from the upper surface of said bored top and provided with second vertical engaging ridges 326 on its outer peripheral surface. The outer tubular member 320b has an actuator receiving hole 328 at the center of its top wall and a peripheral wall 329 projecting outwardly and downwardly from the outer periphery of the top wall and rotatively fitted to the outer surface of the upper tube 305, the outer tubular member 320b further comprising a fourth engaging tube 330 suspending from the inside of the top of the peripheral wall 329 and having second engaging grooves 331 arranged on its inner peripheral surface, said second engaging ridges 326 being engaged with the respective second engaging grooves 331 so that said inner tubular member 320a can be rotated by rotating the outer tubular member 320b. The top wall 332 of the tubular cap is provided on its lower surface and at the inside of the fourth engaging tube 330 with a circular groove 333 that faces downward. The circular groove 333 receives the top of a tubular member 340. Said member comprises a second cylinder 341 which is constituted by its upper portion and functions as a valve box and a tube 342 suspending from the inner periphery of its bored bottom which is realized in the form of an inward flange arranged at the bottom of said second cylinder and fitted into the tubular plunger 311 which is described earlier. The lower half of the tube 342 has a diameter smaller that of the upper half so that it airtightly contacts the inner surface of the tubular plunger by way of a plunger seal 381 in such a manner that the tubular plunger is vertically movable around said lower half. The lower portion of actuator 345 is fitted into the second cylinder 341. Said actuator comprises a stem 347 standing from the top of a third cylinder 346 with a shoulder therebetween and a pusher head 348 provided with a nozzle at the top and an inner tube 349, into which the top of said stem is fitted. The stem has a discharge valve hole 350 at the bottom. The outer diameter of said inner tube 349 is such that it can vertically move through a through bore of said actuator. A tubular valve 351 is fitted to the outer surface of the stem between the shoulder of said actuator 345 and the lower end of said inner tube 349 in such a manner that the actuator can be raised by pushing up the shoulder and lowered by pushing down the lower end of the inner tube 349 and that its outer peripheral surface is slidable on the inner surface of the second cylinder 341. Said tubular valve is held between the shoulder and the lower surface of the top wall 332 of the outer tubular member 320b when the actuator 345 is raised. The discharge valve hole 350 is closed when the tubular valve is in contact with the upper surface of the shoulder of the actuator and opened when the tubular valve is moved away from the shoulder as illustrated in the left half of Fig. 15. The upper portion of said tubular member 340 is designed to receive a rod 356 having a fluid conduit groove 355. Said rod comprises a piston 357 which is constituted by its upper portion and fitted into the third cylinder 346. A second compression spring 358 is disposed between said piston 357 and a stepped area arranged on the inner surface of the stem 347 and facing downward so that the actuator 345 is constantly urged upward. In this liquid jet blower, said first cylinder 304 and the outward flange 305a are connected with each other by means of a plurality of connector plates 360 standing outwardly from the outer surface of the upper portion of the cylinder and spaced apart from any adjacent ones. The cylinder is provided at its top portion with an axial groove 361. Elastic tube section 363 of valve tube 362 is projecting downward into the space between said upper portion of the cylinder and the connector plates 360 and the inner periphery of the bottom of the elastic tube section is tightly fitted to the outer peripheral wall of the cylinder located below the connector plates to form an ambient air inlet valve 364 that also takes the role of relieving the remaining inside pressure. The elastic tube section 363 is suspending from a bored disc 365 of the valve tube 362 and the outer periphery of the bored disc is rigidly fitted to the upper surface of the outward flange 305a. The outer periphery of the bored disc may be rigidly fitted to the upper surface of the outward flange by placing the outer periphery of a holder ring 366 to the bottoms of the vertical ridges arranged on the inner periphery of the lower portion of the upper tube 305 in such a manner that the bored disc 365 is held between the holder ring and the outward flange 305a as seen from Fig. 15. When the sliding tube 310 is located at its uppermost position as illustrated in Fig. 16, ambient air can enter the inside of the container 301 by way of a recess 367 formed on the outer periphery of the tubular plunger 311 which is in contact with the inner periphery of the bored disc 365 so that said outer periphery may be released from the inner periphery of the bored disc as well as the space between the inner surface of the upper tube 305 and the outer surface of the sliding tube located above the tube valve 362. It should be noted that a circular groove 368 is formed on the outer periphery of the upper portion of the tubular plunger 311 and a side groove is further formed in the bottom of said groove so that the inner peripheral area of a packing 369 is received in said groove 368 and its outer peripheral area is slidably in contact with the inner surface of the upper tube. Thus, any shock that may be given rise to when the sliding tube 310 falls down without any liquid contained in the container can be absorbed by said packing and a short tube 370 standing upward from the upper surface of said bored disc 365. Since the liquid jet blower has a configuration as described above, where the inner periphery of the lower end of the elastic tube section 363 is closely in contact with the outer peripheral surface of the cylinder to form an ambient air inlet valve 364 that also plays the role of a pressure relief valve and an axial grove 361 is formed on the upper portion of the cylinder above the contact area of the elastic tube section to replace a through bore of any of the other jet blowers, any pressure remaining in the pressure chamber can be relieved by outwardly pushing and expanding the elastic tube section 363 which downwardly projecting from the valve tube and consequently any pressure as well as any liquid remaining in the container can be ejected out of it outwardly and downwardly. Therefore, unlike the case where the remaining pressure is relieved horizontally, no liquid will attach the inside of the upper portion of the container of this liquid jet blower and give the user an unpleasant and uneasy feeling. When the tubular plunger 311 is at its uppermost position and the pressure within the container turns negative, ambient air enters the container via the ambient air inlet valve 364 via the groove 367 formed on the tubular plunger 311 in the area that contacts the inner periphery of the bored disc 365 to release the plunger from the bored disc which are in contact with each other under an airtight condition. With such an arrangement, the overall configuration of the liquid jet blower can be considerably simple because the ambient air inlet valve 364 also plays the role of a pressessure relief valve. Moreover, since the lower end of the elastic tube section is normally in close contact with the outer peripheral surface of the cylinder to airtightly seal the container, no liquid will flow out of the container passing through the ambient air inlet valve even if the container falls down when ambient air is entering the pressure chamber and therefore the sliding tube is located at its uppermost position. The discharge valve (V) of any of the above described liquid jet blowers can be replaced by either one of the valves illustrated in Figs. 18 and 19. The discharge valve (10) has a bottomed valve tube 17 fitted into the lower end of the depressing spraying head 9. An annular concave part is provided on the side of the middle portion of this valve tube 17 and a valve hole 418 is drilled in this annular concave part. And a collar-like elastic body 19 having a first through-hole is located at the upper end of the stem 6, a casing 20 having a second through-hole is fitted onto the upper portion of the stem 6 and the elastic member 19 is secured thereto. The valve tube 17 is inserted through the second through-hole of the casing 20 and the second hole of the elastic member 19 into the stem 6, the elastic member 19 is fitted into the annular concave part of the valve tube and said valve hole 18 is sealed by means of the inner peripheral surface of the elastic body 19. In addition, the bottomed valve tube 17 is urged upwards by means of said spring 14, thereby maintaining the valve-sealing condition of the elastic member 19 and, together with the lowered depressing spraying head 9 as illustrated in Fig. 4, the bottomed valve tube 17 is lowered, thereby opening the valve hole 18. In the illustrated example, the elastic member is deformed when the valve is opened, but an elastic member for opening the valve by sliding may be also used. A discharge valve (V) as illustrated in Fig. 8 or a discharged valve (V) as illustrated in Fig. 12 may be used for the liquid jet blower as described in Figures 15 to 19. Similarly, the discharge valve of Fig. 12 may be replaced by the discharge valve of Fig. 8. Industrial Applicability This invention can be applied not only to a spray-type blower but also to a jet blower that discharges its content in the form of liquid or foam without reducing it into fine particles. The liquid jet blower of this invention can be used for, e.g., perfume, detergent or pesticide.

Claims: A liquid jet blower comprising a container (201), a main tube (202) arranged in said container (201), a tubular cap (220), a sliding tube (210) to be vertically and slidingly moved by rotating said tubular cap (220), said tubular cap (220) and said sliding tube (210) being urged downward and fit into said main tube (202), a pressure chamber (219) having a liquid suction path and defined by a first cylinder constituted by a lower portion of the main tube (202) and a lower portion of the sliding tube (210), a valve box rigidly fitted to the inside of an upper portion of said tubular cap (220), said pressure chamber (219) and said valve box being kept in communication with each other, and an actuator (245) projecting upward from the valve box through the top of the tubular cap (220), the liquid in said pressure chamber (219) being blown out of a nozzle arranged in said actuator by pushing down said actuator (245), characterized in that it further comprises a pipe member (240) whose upper edge is fitted into a groove (233) formed on the periphery of the lower surface of the top wall (232) of said tubular cap (220) in such a manner that a pipe section (242) projecting downward from the inwardly flanged bottom of a second cylinder (241) formed by the upper portion of said pipe member (240) and used for the valve box provides a path for communicating the inside of said second cylinder (241) and said pressure chamber (219), a third cylinder (246) which is loosely fitted in the second cylinder (241) below the actuator (245) and provided with a stem (247) standing upward from it by way of a shoulder section, a push-down head (248) which is provided with a nozzle and an inner tube (249) and arranged around said stem (247) in such a manner that the inner tube is tightly fitted to the outer surface of the upper portion of said stem (247) and the head itself is urged upward, a tubular valve body (251) which is airtightly arranged around the outer peripheral surface of said stem (247) between said third cylinder (246) and said inner tube (249) in such a manner that it is held between said shoulder section and the lower surface of the top of the tubular cap and can be slidingly moved downward when pushed by the lower end of the inner tube (249) and upward when pushed by the upper end of the shoulder section and its outer peripheral surface is in close contact with the inner peripheral surface of the second cylinder, a piston member (257) which is provided with a rod section (256) having a conduit (255) and projecting downward into said pipe section (242) and fitted into said third cylinder (246), and a discharge valve hole (250) arranged at the bottom of the stem (247).

Inventors: KAKUTA YOSHIYUKI, KISHI TAKAO, TUBAKI TATSUO, KAKUTA, YOSHIYUKI, KISHI, TAKAO, TUBAKI, TATSUO
Applicants: YOSHINO KOGYOSHO CO LTD, YOSHINO KOGYOSHO CO., LTD.
Application year: 1990
Main classification: B05B11
IPC codes: B05B9