Liquid spray rod

Abstract

To prevent damaging of a grip caused by freezing of a liquid remaining in the grip in a liquid spray rod provided with the resin grip through which the liquid is passed.SOLUTION: This liquid spray rod has a feature in which a shell 12 made of a soft vinyl chloride for forming an inflow passage 3a communicated with a flow path 1a of an injection pipe 1 is inserted inside a grip body 9 of a resin grip 3, a radial gap is provided between the outer peripheral surface of the shell 12 and the inner peripheral surface of the grip body 9, and a gap is provided outside one end surface of the shell 12 in a longitudinal direction. According to this feature, even if a liquid remaining in the inflow passage 3a of the grip 3 freezes / expands, the entire shell 12 expands and is elastically deformed so as to extend the shell 12 to one end side in the longitudinal direction after abutment of the outer peripheral surface of the shell 12 against the inner peripheral surface of the grip body 9, thereby reducing radial pressure applied on the grip body 9. Thus, damaging of the grip body 9 can be prevented.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a liquid spray rod used for spraying liquid medicine, water, etc. [Background technology]

[0002] A liquid spray rod (hereinafter simply referred to as a "spray rod") used for spraying liquids such as chemicals or water includes a nozzle having a flow path for liquid supplied from a hose of an external liquid supply source, a spray nozzle attached to one end of the nozzle, a grip connected to the other end of the nozzle and having an inlet path communicating with the nozzle's flow path, and a water stop cock located on the hose side of the grip for controlling or cutting off the flow of liquid to the inlet path of the grip and the flow path of the nozzle.

[0003] In the above-mentioned spray rod, when the stop cock is closed after use, the liquid that flowed into the nozzle flow passage and the inlet passage of the grip remains without being discharged because there is a spray nozzle with a large outflow resistance at the outlet of the nozzle flow passage. Furthermore, the nozzle is generally made of metal, but the grip is often made of resin (the inlet passage of the grip is formed of a resin member), and if liquid remains in the inlet passage of the resin grip, the remaining liquid may freeze in winter and expand radially, causing damage to the grip.

[0004] In response to this, the inventors of the present invention propose in Patent Document 1 to provide a drain valve between the water stop cock of the spray rod and the grip, and after using the spray rod, to close the water stop cock and open the drain valve, thereby enabling any liquid remaining in the nozzle flow path and the grip inlet passage to be drained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5204339 Summary of the Invention [Problem to be solved by the invention]

[0006] However, even with spray rods equipped with drain valves like those described above, although the instruction manual warns that the water should be drained after use, they are often left after use without being drained, leaving liquid in the nozzle flow path and the grip inlet passage, which can cause the grip to break in winter due to the remaining liquid freezing.

[0007] Therefore, an object of the present invention is to prevent damage to a liquid spray rod equipped with a liquid-permeable resin grip due to freezing of residual liquid in the grip. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a liquid spray rod comprising a nozzle having a flow path for liquid supplied from an external liquid supply source, a spray nozzle attached to one end of the nozzle, and a grip connected to the other end of the nozzle and having an inlet passage communicating with the flow path of the nozzle, wherein the grip comprises a cylindrical grip body formed of resin, and a tube body inserted inside the grip body to form the inlet passage, and the tube body elastically deforms when liquid in the inlet passage freezes and expands radially, thereby relieving the radial pressure acting on the grip body (configuration 1).

[0009] According to the above configuration 1, even if the water is not drained after use of the spray rod and the liquid remaining in the inlet passage of the grip freezes in winter, the tube inserted into the grip body relieves the radial pressure acting on the grip body, thereby preventing damage to the grip body.

[0010] In the above configuration 1, if a radial gap is provided between the inner surface of the grip body and the outer surface of the tube, the entire tube will expand in diameter when the liquid in the inlet passage of the grip freezes and expands, thereby effectively alleviating the radial pressure acting on the grip body and more reliably preventing damage to the grip body.

[0011] In the above configurations 1 and 2, a gap may be provided on the longitudinal outer side of one or the other end face of the tubular body. In this way, even if the tubular body cannot expand in diameter to the outer diameter side when the liquid in the inlet passage of the grip freezes and expands, the tubular body extends in the longitudinal direction, thereby mitigating the radial pressure acting on the grip body, and thus preventing damage to the grip body. Effect of the Invention

[0012] As described above, the liquid spray rod of the present invention has an inlet passage formed inside the resin grip body that constitutes the grip, which is connected to the flow path of the nozzle, and a tube inserted therein that elastically deforms when the liquid in the inlet passage freezes and expands, thereby relieving the radial pressure acting on the grip body.Therefore, even if the water is not drained after use, damage to the grip body due to freezing of residual liquid can be prevented. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a front view of a liquid distribution rod according to a first embodiment; [Diagram 2] A longitudinal sectional front view of the main part of FIG. [Diagram 3] (a) is a cross-sectional view taken along line III-III in Figure 2, and (b) is a cross-sectional view corresponding to (a) that explains the behavior of the residual liquid during freezing. [Figure 4] FIG. 3(a) is a cross-sectional view illustrating the behavior of the residual liquid during freezing in a comparative example. [Diagram 5] FIG. 11 is a longitudinal sectional front view of a main part of the liquid dispersing rod of the second embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 5. Fig. 1 to Fig. 3 show a liquid spray rod of a first embodiment. As shown in Fig. 1 and Fig. 2, this liquid spray rod includes a nozzle 1 having a flow path 1a for liquid supplied from a hose H of an external liquid supply source, a spray nozzle 2 attached to one end (the ejection side end) of the nozzle 1, a grip 3 connected to the other end (the supply side end) of the nozzle 1 and having an inlet path 3a communicating with the flow path 1a of the nozzle 1, an intermediate grip 4 provided on the outer periphery of the central portion in the longitudinal direction of the nozzle 1, and a water stop cock 5 provided between the grip 3 and the hose H for controlling or cutting off the flow of liquid from the hose H to the inlet path 3a of the grip 3 and the flow path 1a of the nozzle 1.

[0015] As shown in Fig. 2, the nozzle 1 has an inner tube 6 that forms a flow path 1a inserted into an outer tube 7, and a connection mechanism 8 for connecting to the grip 3 at the supply side end. The inner tube 6 is made of brass, and the outer tube 7 is made of an aluminum alloy. The connection mechanism 8 is made of a first connection ring 8a fixed to the other end of the outer tube 7, a cylindrical connection shaft 8b that is screwed to the inner circumference of the first connection ring 8a, and a second connection ring 8c that is screwed to the outer circumference of the first connection ring 8a, and a female thread for connecting to the grip 3 is formed on the inner circumference of the other end of the connection shaft 8b.

[0016] The grip 3 consists of a cylindrical grip body 9 formed from resin, cylindrical connecting fittings 10, 11 integrated into both ends of the grip body 9 by insert molding, a tube body 12 inserted inside the grip body 9 and both connecting fittings 10, 11, and a cylindrical fixing member 13 that positions the tube body 12 in the longitudinal direction, and the tube body 12 and the fixing member 13 form the inflow passage 3a.

[0017] The connecting fitting 10 on the ejection side of the grip 3 has an external thread formed on the outer periphery of the protruding part from the grip body 9, and the grip 3 and the ejection pipe 1 are connected by the external thread being threadedly engaged with the internal thread of the connecting shaft 8b of the connecting mechanism 8.

[0018] In addition, the supply side connecting fitting 11 has an internal thread formed on the inner circumference of the other end, and this internal thread is screwed into an external thread (not shown) formed on the outlet side of the water stop cock 5, thereby connecting the grip 3 and the water stop cock 5.

[0019] The tube 12 is made of soft polyvinyl chloride, and as shown in Fig. 3(a), its outer diameter is smaller than the inner diameters of the grip body 9 and both connecting fittings 10, 11. The other end of the tube 12 is sandwiched between the inner circumferential surface of the supply-side connecting fitting 11 and the outer circumferential surface of the tubular portion 13a of the fixing member 13, and the flange portion 13b of the fixing member 13 abuts against a stepped surface 11a facing the supply side on the inner periphery of the supply-side connecting fitting 11. As a result, the tube 12 is positioned on the fixing member 13, and radial gaps are provided between the inner circumferential surfaces of the grip body 9 and the outlet-side connecting fitting 10 and the outer circumferential surface of the tube 12, and a gap is provided on the outer longitudinal side of one end face of the tube 12.

[0020] Therefore, in the case of a conventional configuration (comparative example) in which the tube body 12 is not inserted into the grip body 9, as shown in Figure 4, when the liquid remaining in the inlet passage 3a of the grip 3 freezes and expands radially, the grip body 9 may be damaged by radial pressure, whereas in the liquid dispersion rod of this first embodiment, when the liquid in the inlet passage 3a freezes and expands, as shown in Figure 3(b), the entire tube body 12 expands in diameter, and after the outer circumferential surface of the tube body 12 abuts against the inner circumferential surface of the grip body 9, the tube body 12 elastically deforms so as to extend toward one end in the longitudinal direction, thereby alleviating the radial pressure acting on the grip body 9, and therefore damage to the grip body 9 can be reliably prevented.

[0021] 5 shows a liquid dispersion rod of a second embodiment. This second embodiment is based on the first embodiment, but the connection structure between the grip 3 and the nozzle 1 and the water stop cock 5, as well as the arrangement of the tube body 12 of the grip 3 are changed.

[0022] That is, in this second embodiment, the connection fittings 10 and 11 of the grip 3 of the first embodiment are eliminated, and the connection mechanism 8 of the nozzle 1 incorporates a connection shaft 14 having an annular engagement groove 14a on the outer periphery of the other end side instead of the connection shaft 8b of the first embodiment. Then, with the other end of the connection shaft 14 inserted into the inner periphery of one end of the grip body 9, a pair of arms 15a of a U-shaped fixing pin 15 are inserted into a pair of horizontal holes 9a provided in one end of the grip body 9, respectively, and engaged with the engagement groove 14a of the connection shaft 14, thereby connecting the grip 3 and the nozzle 1. Two O-rings 16 are disposed on the outer periphery of the connection shaft 14 on the other end side of the engagement groove 14a to seal the gap with the inner periphery of the grip body 9. Also, the grip 3 is connected to the water stop cock 5 by threadingly engaging the female thread formed on the inner periphery of the other end of the grip body 9 with the male thread of the water stop cock 5.

[0023] The tube body 12 of the grip 3 is assembled with its other end abutting against a step surface 9b facing the ejection side of the inner circumference of the other end of the grip body 9, and no radial gap is provided between the inner surface of the grip body 9 and the outer surface of the tube body 12, but a gap is provided on the longitudinal outside of one end face of the tube body 12, as in the first embodiment.

[0024] Therefore, also in this second embodiment, when the liquid in the inlet passage 3a of the grip 3 freezes and expands, the tube body 12 elastically deforms so as to extend toward one end in the longitudinal direction, thereby relieving the radial pressure acting on the grip body 9, thereby preventing damage to the grip body 9.

[0025] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the scope and meaning equivalent to the claims.

[0026] For example, the material of the tubular body of the grip may be various elastomers including synthetic rubber such as fluororubber and urethane rubber, in addition to the soft polyvinyl chloride used in each embodiment.

[0027] In addition, in each embodiment, a gap is provided on the longitudinal outside of one end face of the tubular body of the grip, but that longitudinal gap may be provided on the longitudinal outside of the other end face of the tubular body, or it is not necessarily required to provide such a gap. [Explanation of symbols]

[0028] 1 jet pipe 1a Flow path 2 Spray nozzle 3 Grip 3a Inlet channel 4. Medium Grip 5. Water stop cock 8 Attachment 9 Grip body 10, 11 Connection fittings 12 Body 13 Fixing member H Fluid supply hose

Claims

1. A liquid spray rod comprising a nozzle having a flow path for liquid supplied from an external liquid supply source, a spray nozzle attached to one end of the nozzle, and a grip connected to the other end of the nozzle and having an inlet path communicating with the flow path of the nozzle, The grip includes a cylindrical grip body formed of resin, and a tube body that is inserted into the grip body to form the inflow passage, A liquid dispersion rod characterized in that the tube body elastically deforms when the liquid in the inlet passage freezes and expands radially, thereby relieving the radial pressure acting on the grip body.

2. 2. The liquid distribution rod according to claim 1, wherein a radial gap is provided between an inner peripheral surface of the grip body and an outer peripheral surface of the tube.

3. 3. The liquid dispersion rod according to claim 1, wherein a gap is provided on the outer side of one or the other end face of the tube in the longitudinal direction.

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