JP3039866U - Small hand pump - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a small-sized manual hand pump which has both miniaturization of a manual hand pump and reduction of force required for use, and further improved airtightness and durability. A pressure tank is provided in the body of a small manual hand pump, and a joint between a piston and a check valve that receives particularly high pressure is firmly joined by ultrasonic welding.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a small hand pump for filling a ball for ball games such as volleyball or a tire of a bicycle with air.

[0002]

[Prior art]

 Conventionally, a pressure tank was provided separately from the main body in order to reduce the force required to use it (force to push the piston) when using it, but a small manual hand pump that is convenient to carry has a separate pressure tank. Therefore, there was a problem that it could not be downsized and the portability was impaired.

Further, in this type of hand pump, resin parts are often used in order to reduce the weight and size, and as a method of joining the parts, adhesion with an adhesive or screwing by providing a screw part on each part is used. The method of binding was common. However, the former has the drawbacks that if the amount of adhesive varies in the manufacturing process, functional defects such as air leakage due to insufficient adhesion and external defects due to dripping occur, and the latter has the disadvantage. Air leakage caused by loosening of screws and deterioration of gaskets provided at the joints due to long-term use, and the provision of threads makes it difficult to downsize the product, and the molding die structure becomes complicated. There was a drawback.

[0004]

[Problems to be solved by the device]

 The present invention has been made to solve such problems, and provides a small-sized manual hand pump that can be downsized as a whole, reduces the force required during use, and is highly airtight and durable. It is a thing.

[0005]

[Means for Solving the Problems]

 The present invention relates to a hollow cylindrical piston having an exhaust hole formed at one end and an open end at the other end, and a piston fixed to face the open end inside the other end of the piston. A non-return valve that allows only intake to the inside, and a cylindrical body with one end being an open end and the other end being a closed end, and the open end side can slide on the outer circumference of the piston. And an intake flange formed on the outer peripheral surface of the piston open end and having a notch groove, and formed on the outer peripheral surface of the piston open end at a predetermined distance from the intake flange. An exhaust flange, an O-ring arranged between the two flanges, in close contact with the cylinder and slidable between the two flanges with a gap with the outer circumference of the piston, and an air hose connected to the exhaust hole of the piston. And an air supply adapter attached to the tip of the air hose, a grip fixed to the one end side of the piston, and a cylinder grip provided on the outer circumference of the cylinder on the closed end side. The check valve is joined by ultrasonic welding, and the internal space of the piston serves as a pressure tank.

Further, in the present invention, the piston and the check valve are made of the same resin material.

With such a configuration, the inside of the piston serves as a pressure tank, and the piston and the check valve are joined by ultrasonic welding, thereby achieving both miniaturization of the product and reduction of the force required for use, airtightness and durability. It is possible to improve the sex.

[0008]

[Embodiment of the invention]

 Embodiments of the present invention will be described with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a piston formed in a hollow cylindrical body, which has an exhaust hole 11 formed at one end side, and an inside which is open at the other end side and which allows only intake into the piston 1. Stop valve 2 is fixed. Reference numeral 1a is a pressure tank for storing compressed air, and the internal space of the piston 1 is used. 3 is a cylinder having a cylindrical shape with one end open and the other end closed, and is slidably fitted to the outer circumference of the piston 1. Reference numeral 3a is a cylinder grip formed on the outer circumference of the cylinder 3 on the closed end side, and is thicker than the outer circumference of the cylinder 3 on the open end side. Reference numeral 4 is a grip fixed to the one end side of the piston 1. Reference numeral 5 denotes an air hose having an air supply adapter 51 and an air needle 52 attached to the tip thereof, which is connected to the exhaust hole 11.

In FIG. 3 and FIG. 4, 13 is an intake flange having a notch groove 12 on the outer peripheral surface of the open end of the piston 1, and 14 is the intake flange 13 with a predetermined distance downward from the intake flange 13 of the piston 1. An exhaust flange is formed on the outer peripheral surface of the open end, and an O-ring 15 is slidably mounted between the two flanges 13 and 14 formed on the piston 1. There is a gap between it and the outer peripheral surface. Reference numeral 2 is a check valve that employs a general poppet valve, and its configuration will be described below. Reference numeral 22 is a poppet, 23 is a spring for supporting the poppet 22, 21 is a check valve body in which one end is an open end and a small hole 21a is provided at the other end, and the poppet 22 and the spring 23 are housed. , Fixed inside the piston 1. Reference numeral 24 denotes a piston head having an intake hole 24a substantially at the center thereof and a disc-shaped poppet packing 24b on the side facing the check valve body 21, which is fixed to the open end of the check valve body. Further, the piston head 24 and the check valve body 21 shown by A and B, and the entire circumferences of the respective joint surfaces of the check valve body 21 and the piston 1 are joined by ultrasonic welding.

Next, the operation during use will be described. First, in the intake operation, when the cylinder 3 is pulled along the piston 1 by holding the grip 4 with one hand and the cylinder grip 3a with the other hand, the O-ring mounted on the piston 1 as shown in FIG. 15 slides toward the intake flange 13 while maintaining a close contact with the cylinder 3. At this time, the intake passage (shown by the arrow in FIG. 5) passing through the notch groove 12 is opened from the gap between the cylinder 3 and the exhaust flange 14, and the air flows into the cylinder 3 through the intake passage. Next, in the exhaust operation, when the cylinder 3 is pushed along the piston 1, the O-ring 15 slides toward the exhaust flange 14 while maintaining the close contact with the cylinder 3 as shown in FIG. At this time, the gap between the cylinder 3 and the exhaust flange 14 is closed by the O-ring 15, and the inside of the cylinder 3 becomes a closed space. The air pressure in the cylinder 3 pushes the poppet 23 in the check valve 2 fixed to the open end of the piston 1, and the spring 22 is compressed to open the check valve 2 and the air in the cylinder 3 is released. It flows into the pressure tank 1a. By repeating the above operation, the air is stored while being compressed in the pressure tank 1a, and is fed into the supplied gas (not shown) such as the ball for ball game through the air hose 5.

In FIG. 6, reference numeral 51 is an air supply adapter, 52 is a ball air needle, and the air needle 52 is detachably attached to the air supply adapter 51 with a screw. When used for a bicycle tire, the air needle 52 can be removed from the air supply adapter 51, and the air supply adapter 51 can be directly connected to the air supply port (not shown) of the tire with a screw.

[0012]

【Example】

 In the small hand pump of the present invention, the same resin having good compatibility, such as ABS resin, is used for the ultrasonically welded piston 1, check valve body 21, and piston head 24. The air hose 5, the O-ring 15 and the poppet packing 24b are made of rubber, and the spring 23 is made of a piano wire type A (SWP-A).

The overall length of the small hand pump of the present invention excluding the air hose is about 28 cm at the shortest and about 50 cm at the longest. The outer diameter is about 34 mm in grip, about 32 mm in cylinder grip, about 26 mm in cylinder, about 18 mm in piston, and the volume of the pressure tank (inside the piston) is about 37 ml. In addition, the force required to use it (the force that pushes the cylinder) is about 4. When the volleyball of No. 5 ball is filled with air (air pressure is about 0.5 kgf / cm ² ). It is 5 kgf. It should be noted that since a hand pump of the same size without a pressure tank requires a force of about 6 kgf, it can be seen that the force of pushing the cylinder is light in this embodiment.

In the above embodiment, ultrasonic welding is used at the joint between the most airtight piston and the check valve, but ultrasonic welding can also be used for joining other parts.

[0015]

[Effect of the invention]

 According to the present invention, since the internal space of the piston is used as a pressure tank, the overall size can be made significantly smaller, that is, the pressure tank must be removed for conventional miniaturization. Although the problem that the cylinder pushing force becomes large is unavoidable, the present invention can achieve both downsizing and reduction of the cylinder pushing force at the same time.

Further, according to the present invention, since the joint surface of the piston and the check valve is joined by ultrasonic welding, the airtightness and pressure resistance are excellent, and the joint portion is damaged by compressed air pressure in the pressure tank. No air leakage is likely to occur. That is, when the inside of the piston is used as a pressure tank, if a joining method using screws or an adhesive is used as the structure for mounting the check valve provided at one end of the piston, the pressure resistance function is insufficient and There is a possibility that air may leak between the screws or from the adhesive surface, but such a problem hardly occurs in the present invention.

[Brief description of the drawings]

FIG. 1 is a front view of a small hand pump according to an embodiment of the present invention.

FIG. 2A of a small hand pump according to an embodiment of the present invention
FIG. 4 is a cross-sectional view taken along a line A.

FIG. 3 is an enlarged sectional view of a check valve.

FIG. 4 is an enlarged perspective view of a check valve.

FIG. 5 is an enlarged cross-sectional view of an O-ring portion showing an intake operation.

FIG. 6 is a partially enlarged cross-sectional view of a tip portion of an air hose.

[Explanation of symbols]

 1 ... Piston 1a ... Pressure tank 2 ... Check valve 3 ... Cylinder 3a ... Cylinder grip 4 ... Grip 5 ... Air hose 11 Exhaust hole 12 Notch groove 13 Intake flange 14 Exhaust flange 15 O ring 21 Check Valve body 21a ... Small hole 22 ... Poppet 23 ... Spring 24 ... Piston head 24a ... Intake hole 24b ... Poppet packing 51 ...・ Air supply adapter 52 ・ ・ ・ Air needle A ・ ・ ・ Joint surface between piston head and check valve body B ・ ・ ・ Joint surface between check valve body and piston

Claims (2)

[Utility model registration claims] 1. A hollow cylindrical piston having an exhaust hole formed at one end and an open end at the other end, and fixed inside the other end of the piston facing the open end. A non-return valve that allows only intake to the piston, and a cylindrical body with one end being an open end and the other end being a closed end, and the open end side slides on the outer circumference of the piston. A cylinder that is fitted as much as possible, an intake flange that is formed on the outer peripheral surface of the piston open end and has a notch groove, and a predetermined interval from the intake flange that is formed on the outer peripheral surface of the piston open end. An exhaust flange, an O-ring disposed between the two flanges, in close contact with the cylinder and slidable between the two flanges with a gap with the piston outer periphery, and an air hose connected to the exhaust hole of the piston An air supply adapter attached to the tip of the air hose, a grip fixed to the one end side of the piston, and a cylinder grip provided on the outer circumference of the cylinder on the closed end side. A small hand pump, wherein a stop valve is joined by ultrasonic welding, and an internal space of the piston serves as a pressure tank. 2. The small hand pump according to claim 1, wherein the piston and the check valve are made of the same resin material.