JP3600524B2 - Flexible tube for connecting pneumatic equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flexible tube for connecting a pneumatic device, and more particularly, to a pneumatic device mainly used in a movable and portable form such as a manual pneumatic tool, which is used by connecting the pneumatic device to a pneumatic supply end. For the improvement of a flexible tube.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in various types of pneumatic equipment used in a movable and portable manner, for example, an air drill (pneumatic drill) or an air grinder (pneumatic grinder) as a manual pneumatic tool, pipes for connecting pipe lines at both ends. By using a flexible tube with a fixed joint, the manual pneumatic tool is connected to the pneumatic supply end, and pressurized air from the pneumatic supply end is supplied to the manual pneumatic tool through the flexible tube. Thus, the required tool operation is obtained, and the operator performs the intended drilling operation, grinder operation, and the like in a movable state while holding the manual pneumatic tool.
[0003]
Here, conventional flexible tubes include, for example, thermoplastic resins such as polyurethane, polyamide, polyester, and polyvinyl which have good moldability and relatively excellent toughness, pressure resistance, and flexibility. A resin tube extruded from a material into a hollow tube having the same inner and outer diameters over the entire length is used, and pipe joints are provided at both ends of the resin tube for use. In other words, on the base end side, an automatic pipe fitting for plug-in / out connection to the pneumatic supply end is fixed, and on the distal end side, an automatic pipe fitting for plug-in / out connection of the pneumatic equipment in the same manner. Automatic fittings with built-in fittings and on-off valves are fixed and used.
[0004]
In this type of flexible tube, a tube having an effective inner diameter corresponding to the amount of air consumed by a pneumatic device to be connected is required, and from the viewpoint of energy saving, the pressure of the supplied compressed air is reduced. In order to suppress the flow velocity as much as possible and reduce the pressure loss as much as possible, in the usual case, select and use a flexible tube with a relatively large effective inner diameter, that is, a somewhat thicker one. It is common to do.
[0005]
In the above-mentioned conventional flexible tube made of a resin molded tube, due to the characteristics of the resin material, the tube itself, which is a movable and portable target portion, is relatively lightweight and has effective flexibility. Therefore, the operator can grasp the manual pneumatic tool with both hands or one hand and handle it relatively easily and with good mobility while the manual pneumatic tool is connected to the pneumatic supply end by the flexible tube. However, on the one hand, once the pressurized air is introduced into the manual pneumatic tool through the flexible tube, the tube itself is stiffened due to the relatively high pressure of the pressurized air. , Its flexibility has been reduced and its mobility has also been weakened, and the handling of manual pneumatic tools by workers, ie, effective and agile functions corresponding to each time required in the work There is a disadvantage that is lost.
[0006]
In particular, the relatively thick flexible tube is relatively heavy, and at present, it is very difficult to handle mobile work operations such as bending and twisting. It is known that the weight of a connecting tube having a diameter of 8 mm and that of a connecting tube having an outer diameter of 12 mm are about twice as large, and that the operating force for bending and twisting is about three times as large. Such a disadvantage in workability can be improved by using a thin flexible tube, but as described above, the effective flow required to supply a proper flow of pressurized air to the pneumatic device is required. Since the inner diameter is predetermined, it is not possible to make it thin unnecessarily, and as a result, this kind of flexible tubing has a "required thickness to obtain appropriate flow characteristics" and "relatively lightweight, There is a demand for a performance that satisfies both "required fineness for obtaining supple operability".
[0007]
The inventor of the present invention disclosed in Japanese Patent No. 3118219 in order to remedy such disadvantages of the conventional flexible tube. A flexible tube configuration that can maintain flexibility was proposed. The flexible tube according to this proposal is connected to the air pressure supply end with respect to the tube diameter including the outer diameter and the effective inner diameter of the tube corresponding to the distal end, which is directly connected to the manual pneumatic device, within the entire length of the tube. It is configured to reduce the diameter gently without any steps from the middle part passing through the base end equivalent side, near the operator's hand when gripping a manual pneumatic device and performing the relevant work by this configuration The stiffening of the tube at the corresponding tube section is effectively mitigated, so that the mobility of the operation itself using the hand-operated pneumatic device is effectively ensured.
[0008]
[Problems to be solved by the invention]
However, in the case of the flexible tube according to the present inventor's proposal, as described above, the inlet diameter of the proximal end side tube portion connected to the air pressure supply end is large, and the tube is directly connected to a manual pneumatic device. Since the discharge port diameter of the side pipe portion corresponding to the distal end is made smaller than this, the flow rate of pressurized air supplied to the manual pneumatic device is inevitably reduced. In some cases, compressed air could not be supplied.
[0009]
Therefore, an object of the present invention is to solve the above-described problem of the flexible tube according to the present inventors, always supply an appropriate flow rate of pressurized air, and perform manual operation even after introducing air pressure. An object of the present invention is to provide an improved flexible tube for connecting a pneumatic device so that the pneumatic device can be handled relatively easily and with good mobility.
[0010]
[Means for Solving the Problems]
To achieve the above object, the invention according to claim 1 according to the present invention is directed to a flexible tube for connecting a pneumatic device used in a movable and portable manner such as a manual pneumatic tool to a pneumatic supply end. Wherein a base portion equivalent side tube portion having a required outer diameter and an effective inner diameter connected to the air pressure supply end, and an identical tube extending to a required length from the base portion equivalent side tube portion A flexible connecting tube member divided into an intermediate pipe portion having a diameter and a pipe portion corresponding to the tip of a discharge portion pipe diameter including the same outer diameter and an effective inner diameter connected to the pneumatic device via the intermediate pipe portion. And each of the connection portions of the intermediate pipe portion, which is connected to the front end equivalent side and the base end equivalent side as closely as possible to the distal end equivalent side tube portion of the connection tube member, In the connecting pipe portion on the base equivalent side with respect to the pipe portion, the pipe diameter of the connecting pipe portion is stepped. In the connecting pipe portion on the side corresponding to the tip, the pipe diameter of the connecting pipe section is increased in a gently tapered shape without a step, thereby reducing the diameter of the tapered pipe section. An intermediate small-diameter pipe portion is formed between the tapered enlarged-diameter pipe portion and the tapered enlarged-diameter pipe portion.
[0011]
In the flexible tube for connecting a pneumatic device according to the first aspect of the present invention, the flexible tube for connecting a pneumatic device is connected to a base equivalent side and a distal equivalent side provided as close as possible to a distal equivalent side pipe portion connected to the pneumatic appliance. Once the diameter of each corresponding pipe portion is reduced gradually to a gentle taper without any step, the diameter is increased again, and the diameter between the tapered reduced diameter pipe portion and the tapered expanded pipe portion is reduced. Since the intermediate small-diameter pipe section is formed in the middle section, the rigidification of the tube at the intermediate small-diameter pipe section near the hand of the worker who performs the work by gripping the pneumatic device is relatively relaxed, and the mobility of the work itself is reduced. Is effectively and effectively secured.
[0012]
Also, the pressurized air introduced from the side corresponding to the base end of the flexible tube gradually reduces the flow path resistance due to the reduced flow in the tapered reduced diameter tube portion corresponding to the base side corresponding side, and the compressed air flows into the intermediate small diameter tube portion. After the holding pressure has been somewhat reduced, but effectively rectified and converted into a uniform and fast flow, the reduced pressure is gradually recovered in the tapered expanded tube corresponding to the tip equivalent side. As a result, an appropriate flow rate of pressurized air can always be supplied to the pneumatic device.
[0013]
According to a second aspect of the present invention, in the configuration of the flexible tube for connecting a pneumatic device according to the first aspect, a taper forming angle at each tapered pipe portion of the intermediate small-diameter pipe portion is: It is characterized in that it is set within an angle range of 0.3 ° to 30 ° with respect to the axis center line.
[0014]
In the flexible tube for connecting a pneumatic device according to the second aspect of the present invention, the taper forming angle at each of the tapered tube portions connected to the base end side and the tip end side of the tube is set at the axis center line of the tube. Is set within the range of 0.3 ° to 30 ° with respect to the air flow, there is no danger of eddies or the like occurring in the flow of air pressure in each corresponding pipe portion, and the action in the above-mentioned claim 1 is further promoted. I do.
[0015]
According to a third aspect of the present invention, in the configuration of the flexible tube for connecting a pneumatic device according to the first or second aspect, a tip-equivalent side pipe portion corresponding to the discharge pipe diameter and the introduction pipe are provided. It is characterized in that each length of the pipe corresponding to the base end corresponding to the diameter is a length at which various pipe joints can be fixed at least.
[0016]
In the flexible tube for connecting a pneumatic device according to the third aspect of the present invention, each of the length of the tube corresponding to the distal end corresponding to the diameter of the discharge tube and the length of the side tube corresponding to the proximal end corresponding to the diameter of the inlet tube is set to at least various types of pipe joint. The length of the pipe can be fixed so that various required pipe joints can be easily and effectively fixed and used for each pipe.
[0017]
According to a fourth aspect of the present invention, there is provided the flexible tube for connecting a pneumatic device according to any one of the first to third aspects, wherein the flexible tube for connecting a pneumatic device corresponds to an intermediate tube except for the intermediate small-diameter tube. Is characterized in that the tube portion is wound and shaped into a spiral shape having a required winding diameter.
[0018]
In the flexible tube for connecting a pneumatic device according to the fourth aspect of the present invention, since the tube portion from the base end equivalent portion to the middle equivalent portion of the flexible tube is spirally wound and shaped, the flexible tube is formed. The effective overall length of the tube is effectively shortened, and the usability is satisfactorily improved due to the elasticity of the spiral tube portion.
[0019]
According to a fifth aspect of the present invention, in the configuration of the flexible tube for connecting a pneumatic device according to the fourth aspect, the winding diameter of the spiral tube portion in the intermediate tube portion is a base end. It is characterized in that it is formed so as to be relatively small on the corresponding side and to gradually increase toward the side corresponding to the tip.
[0020]
In the flexible tube for connecting a pneumatic device according to the fifth aspect, in accordance with the operation of the fourth aspect, the winding diameter of the spiral tube portion over the middle equivalent portion of the flexible tube is set on the base end equivalent side. Since it is relatively small and gradually increases toward the tip equivalent side, the degree of expansion and contraction on the tip equivalent side with a larger winding diameter becomes larger than that on the base equivalent side with a smaller winding diameter, and as a result, Of the intermediate corresponding portions in the above.
[0021]
According to a sixth aspect of the present invention, in the configuration of the flexible tube for connecting a pneumatic device according to any one of the first to fifth aspects, the flexible tube is relatively tough. It is characterized by being formed of a resin material having characteristics excellent in pressure resistance and flexibility.
[0022]
In the flexible tube for connecting a pneumatic device according to the fifth aspect, the flexible tube itself is easily obtained by resin molding, and the flexible tube has a required degree of toughness, pressure resistance, and flexibility. Can give sex.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, each embodiment of the flexible tube for connecting a pneumatic device according to the present invention will be described in detail with reference to FIGS. 1 to 11.
[0024]
[First Embodiment]
FIGS. 1 to 4 show a schematic configuration of a flexible tube to which the first embodiment of the present invention is applied. FIG. 1 is an overall external view showing a configuration of a connection tube member itself, and FIG. FIG. 3 is an overall external view showing a configuration in which automatic fittings for plug-in / out connection are fixed to the base-equivalent side and the tip-equivalent side of the connection tube member, respectively. Automatic fittings for plug-in / out connection on the base equivalent side, and automatic fittings with built-in open / close valve for plug-in / out connection on the tip equivalent side. FIG. 4A is an enlarged cross-sectional view corresponding to the line AA in FIG. 1, and FIG. 4B is an enlarged cross-sectional view corresponding to the line BB in FIG. FIG. 4 is a cross-sectional view of FIG. 4 which is enlarged at the same magnification.
[0025]
With reference to FIGS. 1 and 4, the flexible tube according to the first embodiment has a connection tube member 11 having a unitary configuration, and the connection tube member 11 has the following configuration. Have been. That is,
(A) a base-equivalent tube portion 12, which is connected to an air pressure supply end not shown and corresponds to a base-side / intermediate tube portion a of a required length range based on a tube diameter Xφ including an outer diameter and an effective inner diameter; And an intermediate equivalent pipe portion 13 connected to the base equivalent tube portion 12 in a series,
(B) A tapered reduced diameter transition pipe of a required effective length range which is connected to an intermediate equivalent end portion of the base end side / intermediate pipe portion a and has a gentle taper shape without a step and is gradually reduced in diameter. A tapered reduced diameter equivalent tube portion 14 corresponding to the portion b;
(C) an outer diameter which is connected to an end corresponding to the distal end of the tapered reduced diameter transition pipe portion b and is reduced in diameter to a smaller diameter than the pipe diameter Xφ of the base / intermediate pipe portion a; An intermediate small-diameter pipe portion 15 corresponding to an intermediate small-diameter pipe portion c having a required length range based on a pipe diameter X-ΔXφ including an effective inner diameter;
(D) A tapered enlarged transition pipe having a required effective length range, which is connected to an end corresponding to the tip of the intermediate small-diameter pipe portion c and gradually expands in a gentle taper shape without a step. A tapered diameter-equivalent tube portion 16 corresponding to the portion d;
(E) An outer portion which is connected as close as possible to the end corresponding to the distal end of the tapered enlarged-diameter transition pipe portion d, and which matches or substantially matches the pipe diameter Xφ of the base-side / intermediate pipe portion a. The tip-equivalent tube portion 17 which corresponds to the tip-side tube portion e in the required length range according to the tube diameter Xφ (≒ Xφ) including the diameter and the effective inner diameter, and is also connected to a hand-operated pneumatic tool also not shown here ,
Consists of each tube part.
[0026]
Here, in particular, the relationship between the tube diameters of the respective tube portions of the connection tube member 11 according to the first embodiment will be specifically described. When the pipe diameter Xφ in the part 12 and the intermediate equivalent pipe part 13 is, for example, 14 mmφ, the pipe diameter X−ΔXφ in the intermediate small diameter pipe part 15 as the intermediate small diameter pipe part c is, for example, 8 mmφ. The diameter is gradually reduced so as to form a gentle taper within the length range of the tapered reduced diameter equivalent pipe portion 14 as the tapered reduced diameter transition pipe portion b. Further, the length of the intermediate small-diameter pipe portion 15 may be arbitrarily set in consideration of the usability of a manual pneumatic tool described later. The diameter of the pipe portion 16 is gradually expanded so as to form a gentle taper in the length range of the tapered diameter-equivalent pipe portion 16 in a manner opposite to that of the tapered reduced diameter transition pipe portion b. Then, after restoring the relevant portion to the pipe diameter Xφ or the pipe diameter Xφ (≒ Xφ) again, the pipe is connected in a state as close as possible to the distal end equivalent pipe section 17 as the distal side pipe portion e. Formed in a series.
[0027]
In this case, according to the experimental results of the development process by the present inventor, the taper forming angles at the tapered reduced diameter transition pipe portion b and the tapered enlarged diameter transition pipe portion d are apparent from FIG. As described above, setting this within an angle range of 0.3 ° to 30 ° with respect to the axis center line and, consequently, the pipe surface parallel to the axis center line will improve the flow of the pressurized air introduced. It can eventually contribute sufficiently to the convenience when using a manual pneumatic tool such as an air drill or an air grinder. That is, when the taper forming angle is 0.3 ° or less, there is a difficulty in reducing the rigidity at the time of air pressure supply in the intermediate small diameter pipe portion c, and when the taper forming angle is 30 ° or more, each tapered pipe portion is It has been confirmed that swirls and the like easily occur during the flow of the passing pressurized air, which is not always preferable.
[0028]
On the other hand, in order to obtain the connection tube member 11, for example, polyurethane, polyamide, polyester, polyvinyl or the like has good moldability and relatively toughness, pressure resistance, and flexibility as in the conventional case. By using a thermoplastic resin material having excellent properties, a resin tube having a tube diameter of Xφ, which was once extruded into a hollow tube having the same required inner and outer diameters over its entire length, was prepared. The intermediate small-diameter pipe section c having the pipe diameter X-ΔXφ may be processed and shaped through the reduced-diameter transition pipe section b and the tapered enlarged-diameter transition pipe section d, respectively. The shape of the connection tube member 11 can be extremely easily and inexpensively configured.
[0029]
In addition, as shown in FIG. 2 or FIG. 3, the connection tube having the above configuration is located at the base end equivalent tube portion 12 and is one of a pipe joint and an automatic pipe joint, in this case, the base end side. Each of the automatic fittings 21 (corresponding to FIGS. 2 and 3) is fixed in the same manner as in the related art, and any one of a fitting, an automatic fitting, and an automatic fitting with a built-in on-off valve in the tip equivalent portion 17. In this case, one of the tip-side automatic fittings 22 (corresponding to FIG. 2) or the tip-side automatic fittings 23 (corresponding to FIG. 3) with a built-in on-off valve is fixed to each. The desired connection tube member 11 having the required configuration can be obtained.
[0030]
Accordingly, in the connection tube member 11 according to the first embodiment having the above-described configuration, in FIGS. 2 and 3, each of the proximal automatic pipe joints 21 is connected to the corresponding joint portion of the air pressure supply end not shown, Also, a connection portion of a pneumatic device used in a movable and portable form, not shown, including the distal automatic fitting 22 or the automatic fitting 23 with a built-in on-off valve, for example, a manual pneumatic tool such as an air drill or an air grinder. In the configuration in which the automatic fittings 21 and 22 and 23 are arranged on the base end equivalent side and the distal end equivalent side, respectively, each connection can be performed by one behavior operation. In addition to this, in addition to the above, in the configuration in which the automatic fitting 23 is disposed on the side corresponding to the distal end, regardless of the presence or absence of the on-off valve in the pneumatic device, the opening by the built-in on-off valve here is performed. Operation, it is possible to effectively perform the supply and interruption of the air pressure to be introduced.
[0031]
The greatest advantage of the connecting tube member according to the first embodiment is that a gentle taper is provided at both ends with respect to a tip portion 17 having a pipe diameter Xφ (≒ Xφ) connected to a pneumatic device. This is the point where the intermediate small-diameter tube portion 15 having a tube diameter X-ΔXφ including the tapered reduced-diameter equivalent tube portion 14 and the tapered expanded-diameter equivalent tube portion 16 is connected as close as possible. Therefore, completely different from the conventional case, when arbitrarily gripping a manual pneumatic tool or the like and performing the corresponding operation, the air pressure is introduced into the intermediate small-diameter pipe portion 15 corresponding to the vicinity of the operator's hand. By effectively and sufficiently mitigating the stiffening involved, the mobility of the work itself is extremely effectively and appropriately secured, and in accordance with this, introduction into the base equivalent pipe section 12 connected to the air pressure supply end. Diameter and directly connected to a manual pneumatic tool That since the discharge port diameter at the tip corresponding tube portion 17 is coincident or almost coincident, which as it can maintain the flow rate of the pressurized air fed into 該手 dynamic pneumatic tool always properly.
[0032]
More specifically, the pressurized air introduced from the side corresponding to the base end of the connection tube member 11 gradually reduces the flow path resistance due to the contraction in the tapered reduced diameter transition pipe portion b corresponding to the base end side. As a result, the holding pressure is reduced somewhat to reach the intermediate small-diameter pipe portion c, but the flow is effectively rectified and converted into a uniform and fast flow, and reaches the tapered enlarged-diameter transition pipe portion d corresponding to the tip equivalent side. At this point, the previously reduced pressure is gradually restored, and the compressed air is discharged at the expected flow rate. That is, here, the same operation and effect as in the so-called Venturi tube can be achieved, and the introduced pneumatic energy can be efficiently transmitted. Pressure distribution is also smooth and appropriate.
[0033]
Incidentally, a flexible tube having an intermediate small-diameter tube portion 15 including a tapered reduced-diameter equivalent tube portion 14 and a tapered enlarged-diameter equivalent tube portion 16 according to the first embodiment, and the intermediate small-diameter tube FIG. 11 is a graph showing test results comparing the flow rate characteristics of pressurized air with a flexible tube having a conventional configuration having no portion 15 and the like. Here, the total length of each sample tube used in the comparative test is 10 m, respectively, and the diameter of each tube is as follows.
○ In the case of the flexible tube according to the first embodiment (indicated by a solid line)
Base end equivalent side tube part 12 and middle equivalent tube part 13
Outer diameter 12mm x inner diameter 8.5mm
Intermediate small diameter pipe section 15 including 1.5 m long tapered pipe sections 14 and 16
Outer diameter 8mm x inner diameter 5.7mm
○ In the case of a conventional flexible tube with a nominal 8 mm tube (indicated by a dashed line)
Outer diameter 8mm x inner diameter 5mm
○ In the case of a conventional flexible tube with a nominal 12 mm tube (indicated by a dotted line)
Outer diameter 12mm x inner diameter 8mm
[0034]
That is, the flexible tube according to the first embodiment has the outer diameter including the tapered reduced diameter equivalent tube portion 14 and the tapered increased diameter equivalent tube portion 16 in the connection tube member 11 having the reference outer diameter of 12 mm. It has an intermediate small-diameter tube portion 15 reduced in diameter to 8 mm, and can function as expected by the presence of the intermediate small-diameter tube portion 15. As apparent from the graph of FIG. Regarding the flow rate of the compressed air, almost the same flow rate characteristics as those of the conventional flexible tube having a nominal outside diameter of 12 mm are observed.
[0035]
[Second embodiment]
5 to 7 show a schematic configuration of a flexible tube to which the second embodiment of the present invention is applied. FIG. 5 is an overall external view showing a configuration of a connection tube member itself, and FIG. FIG. 7 is an overall external view showing a configuration in which automatic fittings for plug-in / out connection are fixed to the base end equivalent side and the tip end equivalent side of the connection tube member, respectively. Automatic fittings for plug-in / out connection on the base equivalent side, and automatic fittings with built-in open / close valve for plug-in / out connection on the tip equivalent side. FIG.
[0036]
As is apparent from FIGS. 5 to 7, the connecting tube member 11 to which the second embodiment is applied requires at least a tube portion corresponding to the middle equivalent tube portion 13 excluding the base end equivalent tube portion 12 side. The spiral-shaped tube portion 31 having an effective winding diameter is formed by winding and forming, and in addition to achieving the same operation and effect as the case of the first embodiment, by forming the spiral-shaped tube portion 31, Since the effective overall length of the connecting tube member 11 is effectively shortened, there is a feature that the usability of the manual pneumatic tool is effectively improved with the good elasticity added by the spiral tube portion 31. .
[0037]
[Third embodiment]
8 to 10 show a schematic configuration of a flexible tube to which the third embodiment of the present invention is applied. FIG. 8 is an overall external view showing a configuration of a connection tube member itself, and FIG. FIG. 10 is an overall external view showing a configuration in which automatic fittings for plug-in / out connection are fixed to the base-equivalent side and the tip-equivalent side of the connection tube member, respectively. Automatic fittings for plug-in / out connection on the base equivalent side, and automatic fittings with built-in open / close valve for plug-in / out connection on the tip equivalent side. FIG.
[0038]
In the connection tube member 11 to which the third embodiment is applied, as is apparent from FIGS. 8 to 10, in the configuration of the connection tube member 11 according to the second embodiment, the connection tube member As the spiral tube portion 41 corresponding to the spiral tube portion 31, the winding diameter is relatively small on the proximal end equivalent tube portion 12 side, and the distal end equivalent tube portion 17 side, and further on the tapered reduced diameter equivalent tube portion 14 side. In the spiral tube portion 41, the same shape and effect can be obtained as in the second embodiment. When compared with the expansion and contraction resistance at the base end equivalent tube portion 12 having a small diameter and the winding diameter, the expansion and contraction resistance at the distal end equivalent tube portion 17 having the same tube diameter and the large winding diameter is large, and the degree of expansion and contraction is also large. It will be bigger again This good group of intermediate corresponding pipe section 13 at the time of use, for good stretchability in spiral tube portion 41 in this manner, it is the ease of manual pneumatic tool can be more effectively improved.
[0039]
【The invention's effect】
As described above in detail in each embodiment, according to the flexible tube for connecting a pneumatic device according to claim 1 of the present invention, as close as possible to the distal end side pipe portion connected to the pneumatic device. The configuration of the intermediate small-diameter tube portion including the tapered reduced-diameter tube portion and the tapered enlarged-diameter tube portion at both ends to be connected, in this case, each corresponding tube connected to the base end equivalent side and the distal end equivalent side of the same tube diameter Once the diameter of the pipe is reduced once so that the pipe diameters of the parts have a gentle taper without any level difference, the diameter is expanded again, and the diameter of the tapered reduced diameter pipe section and the tapered expanded pipe section is reduced. Since the intermediate small-diameter pipe section is formed between them, when gripping the pneumatic device and performing the corresponding work, the rigidification of the tube at the corresponding intermediate small-diameter pipe section near the operator's hand is relatively relaxed, Mobility of itself is effectively and effectively secured, and Since the diameter of the discharge pipe on the side corresponding to the distal end matches or almost coincides with the diameter of the inlet pipe on this side, it is extremely excellent in practical use because it can always supply and discharge compressed air at an appropriate flow rate. It has features, and has a preferable advantage that the configuration itself is very simple and easy to implement and can be provided at low cost.
[0040]
According to the flexible tube for connecting a pneumatic device according to the second aspect of the present invention, the taper forming angle at each of the tapered pipe portions connected to the base end side and the end end side of the connection tube member is adjusted. Since the angle is set within the range of 0.3 ° to 30 ° with respect to the axial center line of the tube, there is no fear that any extra vortex or the like may be generated in the air pressure flow in each corresponding tube portion. Item 1 can be further effectively promoted.
[0041]
According to the flexible tube for connecting a pneumatic device according to claim 3 of the present invention, each of the connecting tube member has a distal end equivalent side tube corresponding to the discharge part tube diameter and a base end equivalent side tube corresponding to the introduction part tube diameter. Since the length is set to a length at which various pipe joints can be fixed, various required pipe joints can be easily and effectively fixed and advantageously used for each pipe portion.
[0042]
According to the flexible tube for connecting a pneumatic device according to claim 4 of the present invention, since the pipe portion from the base end equivalent portion to the middle equivalent portion of the connection tube member is spirally wound and shaped, The effective overall length of the connecting tube member can be effectively shortened, and the usability of a manual pneumatic tool or the like can be easily improved with good elasticity of the spiral tube portion.
[0043]
According to the flexible tube for connecting a pneumatic device according to claim 5 of the present invention, the winding diameter of the spiral tube portion over the middle equivalent portion of the connecting tube member is set at the base end in accordance with the effect of claim 4. Since it was formed to be relatively small on the corresponding side and gradually increased toward the tip equivalent side, the degree of expansion and contraction on the tip equivalent side with a larger winding diameter is larger than on the base equivalent side with a smaller winding diameter, This improves the cohesion of the intermediate corresponding portions during use.
[0044]
According to the flexible tube for connecting a pneumatic device according to claim 6 of the present invention, the connecting tube member itself can be easily obtained by resin molding, and the connecting tube member has a required degree of toughness, pressure resistance, and flexibility. Sex can easily be given.
[Brief description of the drawings]
FIG. 1 is an overall external view showing a configuration of a connection tube member itself in a flexible tube to which a first embodiment of the present invention is applied.
FIG. 2 is an overall external view showing a configuration in which automatic pipe joints for plug-in / out connection are fixed to the base end side and the end side of the connecting tube member according to the first embodiment; It is.
FIG. 3 shows an automatic pipe fitting for plug-in / out connection on the side corresponding to the base end of the connecting tube member according to the first embodiment, and an automatic pipe with a built-in open / close valve for plug-in / out connection on the side corresponding to the tip end. FIG. 3 is an overall external view showing a configuration in a state where joints are fixedly provided.
FIG. 4 is an enlarged view of an AA line portion (corresponding to FIG. 4A) and a BB line portion (corresponding to FIG. 4B) of FIG. 1 according to the first embodiment at the same magnification; FIG.
FIG. 5 is an overall external view showing a configuration of a connection tube member itself in a flexible tube to which a second embodiment of the present invention is applied.
FIG. 6 is an overall external view showing a configuration in which automatic fittings for plug-in / out connection are fixed to the base tube equivalent side and the distal end equivalent side of the connection tube member according to the second embodiment, respectively. It is.
FIG. 7 shows an automatic pipe fitting for plug-in / out connection on the side corresponding to the base end of the connection tube member according to the second embodiment, and a built-in open / close valve for plug-in / out connection on the side corresponding to the tip end. FIG. 3 is an overall external view showing a configuration in a state where joints are fixedly provided.
FIG. 8 is an overall external view showing a configuration of a connection tube member itself in a flexible tube to which a third embodiment of the present invention is applied.
FIG. 9 is an overall external view showing a configuration in which automatic fittings for plug-in / out connection are fixedly mounted on the base-equivalent side and the end-equivalent side of the connection tube member according to the third embodiment, respectively. It is.
FIG. 10 shows an automatic pipe fitting for plug-in / out connection on the side corresponding to the base end of the connection tube member according to the third embodiment, and a built-in open / close valve for plug-in / out connection on the side corresponding to the tip end. FIG. 3 is an overall external view showing a configuration in a state where joints are fixedly provided.
FIG. 11 is a graph showing a comparison of flow rate characteristics between the flexible tube according to the first embodiment of the present invention and a flexible tube having a conventional configuration.
[Explanation of symbols]
11 Connection tube member
12 Base end equivalent side tube
13 Middle equivalent side tube
14 Tapered equivalent diameter tube
15 Middle small diameter pipe
16 Taper-shaped expanded tube
17 Tip equivalent side tube
21 Base end automatic fittings
22 Tip automatic fitting
23 Tip side automatic fitting with built-in on-off valve
31, 41 spiral part

Claims (6)

A flexible tube for connecting a pneumatic device used in a movable and portable manner such as a manual pneumatic tool to a pneumatic supply end,
A base end equivalent side pipe part including a required outer diameter and an effective inner diameter connected to the air pressure supply end, and an intermediate pipe having the same diameter and extending from the base end equivalent side pipe part to a required length. A flexible connection tube member divided into a portion and a tube portion corresponding to the tip of the discharge portion tube diameter including the same outer diameter and an effective inner diameter connected to the pneumatic device via the intermediate pipe portion,
Of the connecting tube member, for each corresponding connecting pipe portion of the intermediate pipe portion which is connected to the distal end equivalent side and the base end equivalent side as close as possible to the distal end equivalent side pipe portion as much as possible. In the connecting pipe portion on the base equivalent side, the pipe diameter of the connecting pipe portion is reduced in a gentle taper shape without a step, and in the connecting pipe portion on the distal end equivalent side, the pipe diameter of the connecting pipe portion is reduced. Flexible for pneumatic equipment connection, characterized in that the diameter is expanded in a gentle taper shape without a step, and an intermediate small diameter pipe portion is formed between the tapered reduced diameter pipe portion and the tapered enlarged diameter pipe portion. tube. 2. The flexible tube for connecting a pneumatic device according to claim 1, wherein a taper forming angle of each tapered tube portion of the intermediate small-diameter tube portion is 0.3 ° to 30 ° with respect to an axis center line. 3. The flexible tube for connecting a pneumatic device, wherein the angle is set within the range of the angle. 3. The flexible tube for connecting a pneumatic device according to claim 1, wherein each of the distal end corresponding side tube corresponding to the discharge unit tube diameter and the base end equivalent side tube corresponding to the introduction unit tube diameter. 4. A flexible tube for connecting a pneumatic device, wherein the length is at least a length at which various pipe joints can be fixed. In the configuration of the flexible tube for connecting a pneumatic device according to any one of claims 1 to 3, the tube portion corresponding to the intermediate tube portion except for the intermediate small-diameter tube portion has a spiral shape having a required winding diameter. A flexible tube for connecting a pneumatic device, which is wound and shaped. 5. The flexible tube for connecting a pneumatic device according to claim 4, wherein a winding diameter of the spiral tube portion in the intermediate tube portion is relatively small on a side corresponding to a base end and is directed toward a side corresponding to a front end. A flexible tube for connecting a pneumatic device, wherein the flexible tube is formed so as to gradually increase in size. The flexible tube for connecting a pneumatic device according to any one of claims 1 to 5, wherein the connection tube member has relatively excellent toughness, pressure resistance, and flexibility. A flexible tube for connecting a pneumatic device, which is formed of a resin material.

Images