JP3023381U - Air pump - Google Patents

Abstract

(57) [PROBLEMS] To make it possible to easily form a piston portion in an air pump that supplies compressed air in both forward and backward movements and to improve its reliability. A groove (26) is formed in a piston body (23), and air passages (30, 32) opening in the groove (26) are formed. O-rings 31, 34 located in both passages 30, 32
Fit in. In addition, a passage as shown in the drawing is formed in the piston body 23. When the cylinder 5 moves up, the cylinder lower chamber 4
Air in 2 is a void D ₁ → passage 36 → passage 33 → passage 32
The O-ring 34 from the concave groove 26 to the passage 29,
It is pumped through 40 and 39. When the cylinder 5 is moved downwards, the air in the cylinder upper chamber 17 passes through the passage 27 → the passage 30.
The O-ring 31 from the concave groove 26 to the passage 29,
It is pumped through 40 and 39.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an air pump, and more specifically, it is a manual air pump that pumps air during both forward and backward operations.

[0002]

[Prior art]

 Conventionally, a manual air pump that pumps air during forward and backward movement is known, for example, from Japanese Utility Model Publication No. 3-38464, but its piston part is composed of multiple parts and the piston part The valve is a flat plate that slides up and down.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional structure, the piston part is composed of multiple parts, so the manufacturing cost is high, the assembly requires considerable labor, and the valve body slides. However, there is a problem that the valve body is twisted and there is some anxiety about its opening and closing.

Therefore, the present invention is to provide an air pump capable of pressure-feeding air both in forward and backward movements, and in which a piston portion capable of pressure-feeding can be easily formed and can be operated reliably. It is intended.

[0005]

[Means for Solving the Problems]

In order to solve the above problems, the first invention according to claim 1 is a rod comprising an inner-outer double pipe (11) (13) standing on a base (2) having an air discharge passage (14). (3), a piston portion (4) fixed to the upper end of the rod (3), a cylinder (5) that moves up and down by inserting the piston portion (4), and an upper end of the cylinder (5) A cylinder upper chamber (17) and a cylinder lower chamber (42) defined by the piston part (4), and the inside of the inner pipe (11) of the rod (3) is filled with air. The lower end of the discharge passage (10) communicates with the air discharge passage (14) of the base (2), and the space between the outer pipe (13) and the inner pipe (11) communicates with the outside through the air suction passage (12). The outer diameter of the piston body (23) forming the piston portion (4) is slightly smaller than the inner diameter of the cylinder (5). Then, a space (D ₁ ) is formed between them, and O-rings (28) (35) for sealing are provided on the upper and lower portions of the outer periphery of the piston body (23) to seal the above space (D ₁ ). The piston body (23) is provided with a concave groove (26) around the entire circumference between the O-rings (28) and (35) and a third passage opening to the upper part of the concave groove (26). (30) and a fourth passage (32) opening to the lower part of the concave groove (26) are formed, and a fourth passage (32) penetrating the piston body (23) in the transverse direction between the passages (30) and (32). Two passages (29) are formed, and the piston body (23) further has a first passage (27) for communicating the third passage (30) with the cylinder upper chamber (17), and one end of which is the fourth passage. It communicates with the passage (32), and the other end is located below the lower O ring (35) for sealing. Forming the piston body (23) of the cylinder (5) Fifth passage (33) communicating with the gap (D ₁₎ between the air suction passage of the rod (3) in the upper part (12) check valve ( 41) through the fifth passageway (33), and the concave groove (26) is located at the openings of the third passageway (30) and the fourth passageway (32), respectively. The opening and closing O-rings (31) (34) made of elastic members are fitted to allow the air flow from the third passage (30) and the fourth passage (32) toward the concave groove (26). The air pump is characterized in that the flow of air in the reverse direction is blocked, and the upper part of the cylinder upper chamber (17) is communicated to the outside via a check valve (18).

According to a second aspect of the present invention, a rod (50) consisting of a single tube erected on a base (51) having an air discharge passage (70) and a piston body fixed to the upper end thereof. (52), a cylinder (60) that moves up and down by inserting the piston body (52), a handle (6) provided at the upper end of the cylinder (60), and the piston body (52) It is composed of a cylinder upper chamber (65) and a cylinder lower chamber (68), and the outer diameter of the piston body (52) is made slightly smaller than the inner diameter of the cylinder (60) so that the space (D ₂ ) (D ₃ ) (D ₄ ), an upper groove (53) is formed in the upper part of the outer periphery of the piston body (52), and a lower groove (54) is formed in the lower part over the entire circumference. O-rings (61) (62) made of elastic members for opening and closing are provided in the grooves (53) (54), respectively. ) Has its outer periphery in contact with the inner surface of the cylinder (60), and the inner periphery is separated from the groove bottoms of both grooves (53) and (54) so that it can move up and down. Forming a communication passageway (55) located in the middle of the groove (53) (54) of the upper part and opening to the outer peripheral surface of the piston. A communication hole (56) (57) communicating with the communication passage (55) is formed on the surface on the side where it is located, and the upper portion of the air discharge passage (58) of the rod (50) is connected to the communication passage (58). 55), the lower part is communicated with the air discharge passage (70) in the base (51), and the cylinder upper chamber (65) is communicated with the outside through the check valve (63). An air port characterized by communicating the lower chamber (68) to the outside through the check valve (66). It is a flop.

Further, a third invention according to claim 3 is that a rod (50) consisting of a single tube erected on a base (51) having an air discharge passage (70), and a piston body fixed to the upper end thereof. (52), a cylinder (60) that moves up and down by inserting the piston body (52), a handle (6) provided at the upper end of the cylinder (60), and a piston body (52) It consists of a cylinder upper chamber (65) and a cylinder lower chamber (68), and the outer diameter of the piston body (52) is slightly smaller than the inner diameter of the cylinder (60) so that there is a space (D ₂ ) (D) between them. ₃ ) (D ₄ ), an upper groove (53) is formed in the upper part of the outer circumference of the piston body (52), and a lower groove (54) is formed in the lower part of the piston body (52) over the entire circumference. 52), which is located in the middle of the above-mentioned upper and lower grooves (53) (54). A communication passageway (55) that opens to the outer peripheral surface of the ton is formed, and air is allowed to flow from the cylinder upper chamber (65) to the communication passageway (55) in the upper groove (53) and blocked in the opposite direction. U-packing (61a) that allows air to flow from the lower chamber (68) of the cylinder to the communication passage (55) in the lower groove (54) and shuts off in the opposite direction. Further, an upper portion of the air discharge passage (58) in the rod (50) communicates with the communication passage (55), and a lower portion communicates with the air discharge passage (70) in the base (51). An air pump characterized in that the cylinder upper chamber (65) communicates with the outside through the check valve (63) and the cylinder lower chamber (68) communicates with the outside through the check valve (66). is there.

[0008]

[Embodiment of device]

 Next, an embodiment of the drawing in which the present invention is applied to a bicycle air pump will be described. 1 to 7 show a first embodiment of the present invention and correspond to the invention of claim 1.

FIG. 1 is a partially cut-away side view showing the entire air pump. Reference numeral 1 denotes a foot rest, to which a base 2 is fixed. Reference numeral 3 is a rod portion standing on the base portion 2, and a piston portion 4 is fixedly mounted on the upper end of the rod portion. Reference numeral 5 denotes a cylinder, which is vertically movably fitted to the outer circumferences of the rod portion 3 and the piston portion 4, and a manual handle 6 is fixed to the upper end of the cylinder 5. Reference numeral 7 is a hose communicating with the base portion 2, and 8 is a nozzle.

FIG. 2 is a detailed sectional view of the rod portion 3, the piston portion 4 and the cylinder 5 portion, and FIG. 3 is an enlarged sectional view of the piston portion 4. 2, the rod portion 3 includes an inner pipe 11 having an air discharge passage 10 inside and an outer pipe 13 fitted with a gap so that an air suction passage 12 is formed outside the inner pipe 11. The outer pipe 13 has a lower end screwed to the base 2, the piston 4 is screwed to the upper end, and the upper and lower ends of the inner pipe 11 are crimped to the piston 4 and the base 2. Both pipes 11 and 13 are integrally erected on the base portion 2.

A lower end of the air discharge passage 10 communicates with the hose 7 through an air discharge passage 14 formed in the base 2. Further, a first air intake port 15 communicating with the air intake passage 12 is opened in a lower portion of the outer pipe 13.

The lower portion of the cylinder 5 is slidably fitted to the outer circumference of the outer tube 13, and the fitting portion is sealed by an O-ring 16. The upper part of the cylinder upper chamber 17 of the cylinder 5 communicates with the outside through the gap 19, the air suction passage 20, the air suction chamber 21, and the second air suction port 22 through the first U packing 18. The inflow of air from the outside to the cylinder upper chamber 17 is allowed, and the outflow of air from the cylinder upper chamber 17 to the outside is blocked.

The piston portion 4 will be described in detail with reference to FIG. Reference numeral 23 denotes a piston body made of synthetic resin, which has an upper body 24, a lower body 25, and a concave groove 26 formed between them integrally formed. The upper body 24 is formed in a cylindrical shape, and the first passage 27 is formed inside thereof. A first O-ring 28 for sealing is fitted on the outer circumference of the upper body 24 so that the upper body 24 moves up and down while maintaining a sealed state with the cylinder 5.

The concave groove 26 is formed in an annular shape around the entire circumference of the piston body 23. As shown in FIG. 4, a second passage 29 penetrating in the transverse direction is formed in the piston body 23 having the concave groove 26, and both ends of the second passage 29 are in open communication with the concave groove 26.

Reference numeral 30 denotes a third passage formed on the upper side of the concave groove 26 so as to cross two as shown in FIG. 5, and is in open communication with the first passage 27 and the concave groove 26. A second O ring 31 for opening and closing made of an elastic material such as rubber or resin is press-fitted to the groove bottom of the concave groove 26 in which the third passage 30 opens, and air pressure from the first passage 27 side is By this, the flow is expanded to allow the outflow of air from the third passage 30 to the concave groove 26, and the inflow of air from the concave groove 26 to the third passage 30 is blocked.

Reference numeral 32 denotes a fourth passage formed under the concave groove 26 so as to extend across two as shown in FIG. 6, and communicates with the fifth groove 33 formed in the body of the concave groove 26 and the lower body 25. ing. A third O-ring 34 for opening and closing is press-fitted to the groove bottom of the concave groove 26 in which the fourth passage 32 opens, and is expanded by the air pressure from the fifth passage 33 to open the fourth passage. The air is allowed to flow from the groove 32 to the concave groove 26, and the flow of the air from the concave groove 26 to the fourth passage 32 is blocked.

The lower body 25 is formed in a cylindrical shape, its outer diameter is slightly smaller than the inner diameter of the cylinder 5, and a gap D ₁ is formed between its outer peripheral surface and the cylinder 5. Further, a fourth O-ring 35 for sealing is fitted on the upper side of the outer peripheral surface thereof, and seals between the piston body 23 and the cylinder 5 at this portion.

Reference numeral 36 is a sixth passage that connects the fifth passage 33 formed in the lower body 25 and the gap D ₁ . Reference numeral 37 denotes a cylindrical packing holder installed in the lower body 25, the lower end of which is in airtight contact with the upper end of the inner tube 11 and the upper end of which is hermetically sealed by a fifth O-ring 38 for sealing. There is. A seventh passage 39 is vertically formed at the center of the packing holder 37, the lower end of which communicates with the air discharge passage 10 of the inner pipe 11, and the upper end of which extends through the eighth passage 40 to the second passage 29. It is in communication.

Reference numeral 41 denotes a second U-packing provided in the packing holder 37, which allows the inflow of air from the air suction passage 12 to the side of the fifth passage 33 and allows the air to flow in the opposite direction. Is designed to shut off.

Next, the operation of the first embodiment will be described. When the manual handle 6 is pulled up and the cylinder 5 is pulled up as shown in FIG. 2, and then the manual handle 6 is pushed down to push down the cylinder 5, the first U packing 18 is closed and the cylinder upper chamber 17 of FIG. The volume is reduced and the air in the cylinder upper chamber 17 is compressed to a high air pressure.

Therefore, the second O-ring 31 is pushed open by the air pressure, and the compressed air in the cylinder upper chamber 17 is, as indicated by the solid arrow, the first passage 27 → the third passage 30 → the concave groove 26 → the second passage. The compressed air is supplied from the nozzle 8 through 29 → eighth passage 40 → seventh passage 39 → air discharge passage 10 → air discharge passage 14 → hose 7.

On the other hand, when the cylinder 5 is pushed down, the volume in the cylinder lower chamber 42 is increased and a negative pressure state is established. Therefore, the air outside the pump is sucked from the first air suction port 15 due to the pressure difference between the pressure in the cylinder lower chamber 42 and the atmosphere, and the air suction passage 12 → the second U packing 41 → the second air packing 41 as shown by the dotted arrow. The gas flows into the lower chamber 42 through the fifth passage 33, the sixth passage 36, and the gap D _1, and the lowering of the cylinder 5 is performed without any trouble, and the air is supplied to the lower chamber 42 of the cylinder.

At this time, the third O-ring 34 is not pushed open because the high air pressure acting in the concave groove 26 is larger than the atmospheric pressure acting in the fourth passage 32. In this way, the compressed air is supplied during the downward movement (during forward movement) of the cylinder 5, and the cylinder 5 descends as shown in FIG.

Next, when the manual handle 6 is pulled up from the state of FIG. 7 and the cylinder 5 is pulled up, the volume in the lower chamber 42 is reduced and the air in the lower chamber 42 is compressed in FIG. Become.

Therefore, the second U packing 41 is closed due to the differential pressure between the high air pressure in the lower chamber 42 and the atmospheric pressure in the air suction passage 12, and the pressure in the recessed groove 26 and the height of the fourth passage 32 are increased. The third O-ring 34 is pushed open by the pressure difference from the air pressure. Further, the second O-ring 31 is closed by the differential pressure between the negative pressure inside the cylinder upper chamber 17 and the high pressure inside the concave groove 26.

As a result, the air in the cylinder lower chamber 42 is allowed to flow in the space D ₁ → the sixth passage 36 → the fifth passage 33 → the fourth passage 32 → the concave groove 26 → the second passage 29, as indicated by the solid arrow in FIG. → Eighth passage 40 → Seventh passage 39 → Air discharge passage 10 → Air discharge passage 14 → Hose 7 The nozzle 8 discharges the compressed air to supply compressed air.

On the other hand, as the cylinder 5 is pulled up, the volume in the cylinder upper chamber 17 is increased and a negative pressure state is established. Therefore, the pressure difference between the pressure in the cylinder upper chamber 17 and the atmosphere causes the first U-packing 18 to open, and the air outside the pump is sucked in through the second air suction port 22 and the air suction as indicated by the dotted arrow. The air flows into the cylinder upper chamber 17 through the chamber 21 → the air suction passage 20 → the gap 19 → the U packing 18, the cylinder 5 is moved up without any trouble, and the air is supplied into the cylinder upper chamber 17. Be seen.

In this way, the compressed air is supplied even during the upward movement of the cylinder 5 (during the backward movement), and the cylinder 5 rises as shown in FIG. Next, a second embodiment shown in FIGS. 8 to 12 corresponding to the invention of claim 2 will be described.

Reference numeral 50 denotes a rod made of a single tube, which is erected on the base portion 51 in the same manner as in the above embodiment. A piston body 52 is made of a synthetic resin material and fixed to the upper end of the rod 50.

The piston body 52 has an upper groove 53 formed in an upper circumferential direction, a lower groove 54 formed in a lower circumferential direction, and a ninth communication passage 55 penetrating transversely in a central portion. At both ends of the ninth communication passage 55, communication holes 56 and 57 communicating with the upper groove 53 and the lower groove 54, and the ninth communication passage 55 and the air discharge passage 58 in the rod 50 are communicated with each other. It is composed of the tenth communication passage 59.

The piston body 52 is inserted in the cylinder 60, and the outer diameter of the piston body 52 is formed to be smaller than the inner diameter of the cylinder 60. The piston body 52 has voids D ₂ , D ₃ , D ₄ and is formed in the cylinder 60. It can slide against.

Reference numeral 61 is an upper O-ring for opening and closing provided in the upper groove 53, and 62 is a lower O-ring for opening and closing provided in the lower groove 54, each formed of an elastic material such as rubber or synthetic resin. Is made. The outer diameters of the both O-rings 61 and 62 are formed so as to slide in pressure contact with the inner peripheral surface of the cylinder 60.

The groove widths (axial lengths) and depth widths of the upper and lower grooves 53 and 54 are set to be larger than the wire diameter dimensions of the O-rings 61 and 62, and the respective O-rings 61 are arranged. , 62 can be moved up and down in the grooves 53, 54.

A U-packing 63 is provided on the upper portion of the cylinder 60 to allow the inflow of air from the air suction port 64 communicating with the outside to the cylinder upper chamber 65, and to allow the air to flow from the upper chamber 65 to the air suction port 64. It is designed to prevent the outflow of air.

A U-packing 66 is provided in the lower portion of the cylinder 60 to allow the inflow of air from the air intake port 67 communicating with the outside to the cylinder lower chamber 68, and to allow the air from the cylinder lower chamber 68 to the air intake port 67. It is designed to prevent the outflow of air into. 69 is an O-ring for sealing.

The lower end of the air discharge passage 58 in the rod 50 communicates with the hose 7 through the air discharge passage 70 as in the first embodiment. Further, a manual handle 6 similar to that of the first embodiment is fixed to the upper end of the cylinder 60.

The operation of the second embodiment will be described. First, when the cylinder 60 is pushed down by the manual handle, both O-rings 61 and 62 are attached to the lower surfaces of the upper and lower grooves 53 and 54 as shown in FIG. 8 due to the contact frictional resistance between the outer peripheral ends and the cylinder 60. The upper O-ring 61 opens the gap D ₂ and the lower O-ring 62 closes the gap D ₄ . Further, the U packing 63 is closed.

Therefore, the air in the cylinder upper chamber 65 compressed by the volume reduction of the cylinder upper chamber 65 has a clearance D ₂ → upper groove 53 → communication hole 56 → communication passage 55 → communication passage 59 → as indicated by a solid arrow. Air is discharged from the nozzle 8 through the air discharge passage 58, the air discharge passage 70, and the hose 7.

On the other hand, the volume of the lower chamber 68 is expanded, and the negative pressure causes the atmosphere to push open the U packing 66 from the air suction port 67 and flow into the lower chamber 68 as shown by the dotted arrow, and push down the cylinder 60. And air is supplied to the lower chamber 68.

Next, when the cylinder 60 is pulled up by pulling up the manual handle from the above-described depressed state of the cylinder 60, both O-rings 61 and 62 are placed on the upper surfaces of the upper and lower grooves 53 and 54 as shown in FIG. By moving, the upper O-ring 61 closes the gap D ₂ and the lower O-ring 62 closes the gap D ₄ . Also, the U packing 66 is in a closed state.

Therefore, the air in the cylinder lower chamber 68 compressed by the volume reduction of the cylinder lower chamber 68 is, as shown by the solid arrow in FIG. 12, a gap D ₄ → lower groove 54 → communication hole 57 → communication passage 55 → communication path. Air is discharged from the nozzle 8 through the passage 59, the air discharge passage 58, the air discharge passage 70, and the hose 7.

On the other hand, the volume of the cylinder upper chamber 65 is expanded, and the negative pressure causes the atmosphere to push open the U packing 63 from the air inlet 64 as shown by the dotted arrow and flow into the upper chamber 65, and the cylinder 60 is pulled up. And the supply of air to the upper chamber 65 is performed.

FIG. 13 shows a third embodiment of the present invention and corresponds to the invention of claim 3. In the third embodiment, U-packings 61a and 62a are used instead of the O-rings 61 and 62 in the second embodiment, and the communication holes 56 and 57 are eliminated. Other structures are the same as those in the second embodiment. Similar to the example.

Next, the upper U packing 61a in the third embodiment has a structure that allows the flow of air from the cylinder upper chamber 65 to the communication passage 55 and blocks the flow in the opposite direction. Further, the lower U packing 62a has a structure that allows the flow of air from the lower cylinder chamber 68 to the communication passage 55 and blocks the flow in the opposite direction.

Therefore, when the cylinder 60 is pushed down, the air in the cylinder upper chamber 65 is compressed, the compressed air flows as shown by the solid line arrow in FIG. 13, and when the cylinder 60 is pulled up, the cylinder lower chamber 68 The air inside is compressed, the compressed air flows as shown by the dotted arrow in FIG. 13, and compressed air can be supplied in the forward and backward movements of the cylinder 60 as in the second embodiment.

14 and 15 show another embodiment of the valve device in the upper part of the cylinder. In FIG. 14, reference numeral 80 denotes a cylindrical suction chamber formed in the upper portion of the cylinder 5 or 60 in the above embodiment, and a cylindrical member 81 is fitted and fixed in the chamber 80. A small diameter portion 82 having a diameter smaller than the inner diameter of the chamber 80 is formed in the member 81, and a gap D ₅ is formed between the outer peripheral surface of the small diameter portion 82 and the inner surface of the suction chamber 80.

A circumferential groove 83 is formed in the small diameter portion 82, and an O ring 84 for opening and closing is provided in the groove 83. The O-ring 84 is formed so that its outer peripheral surface contacts the inner surface of the suction chamber 80 and is vertically movable.

Further, on the lower surface of the groove 83, a protruding portion 85 that is raised in a part in the circumferential direction is formed. With such a structure, when the air in the cylinder upper chamber 17 or 65 of the cylinders 5, 60 is compressed, the O-ring 84 moves upward and presses against the upper surface of the groove 83 and the inner surface of the suction chamber 80. The compressed air in the upper chamber 17 or 65 does not escape to the air suction port 22 or 64.

When the inside pressure of the cylinder upper chamber 17 or 65 becomes negative, the O-ring 84 moves downward and hits the projection 85 formed in the groove 83, so that the air intake port 22 or 64 shows the dotted arrow in FIG. of as, through the groove 83 → protrusion 85 → gap D _5, it flows into the upper chamber 17 or 65 cylinders, forms the same operation as the U-packing 18,63 in the first and second embodiments.

FIG. 16 shows an example in which the structures of the U-pack 66 and the air intake 67 at the bottom of the cylinder 60 in the second embodiment shown in FIG. 8 are different from each other. I.e., the lower internal diameter of the cylinder 60 in the slightly larger diameter than the outer diameter of the rod 50, the gap D ₆ formed between them, with a U-packing 90 to open and close the the clearance D ₆ in Cylinders 60 side Is.

With such a structure, when the air in the cylinder lower chamber 68 is compressed, the U packing 90 closes the gap D _6, and when the cylinder lower chamber 68 becomes a negative pressure, the U packing 90 opens and the outside air is released. To flow into the lower chamber 68 through the gap D _{6 as} indicated by the dotted line arrow, and the same operation as the U packing 66 and the air suction port 67 in the second embodiment is performed.

[0052]

EFFECTS OF THE INVENTION As described above, according to the present invention, compressed air can be supplied during forward and backward movements, and in particular, when the piston body is molded from a synthetic resin material, its groove is formed. And the communication passage can be formed at the same time, and the O-ring and the U packing can be simply fitted after the molding, so that the piston portion can be formed more easily than the conventional one, and the number of parts can be increased. Also less. Further, since the valve portion is an O-ring or a U-packing, its opening / closing operation is reliable and reliability is improved.

Further, generally, when pushing down the handle of the air pump, a large pushing force can be exerted because the operator's weight is put on the handle and pushed down by utilizing the weight. Conversely, when pulling up the handle, The pulling force is smaller than when pushing down. Therefore, in the present invention, the volume of the cylinder upper chamber side is increased, a rod is inserted into the cylinder lower chamber side to reduce the volume of the lower chamber, and the air in the cylinder upper chamber is compressed when the handle is pushed down. The pressure receiving area for increasing the pressure is small, and the pressure receiving area for compressing the air in the cylinder lower chamber is small when the handle is pulled up. Therefore, high pressure can be easily generated by applying weight when pushing down the handle that requires large operating force, and high pressure can be easily generated with light force when pulling up which is a small operating force. It is valid.

Further, in the prior art described in the above publication, the intake air is sucked in through the long air intake passage both in the forward and backward movements, but in the present invention, the cylinder is lifted. Air can be sucked into the cylinder upper chamber at this time by providing a suction port at a distance close to the cylinder upper chamber. Therefore, in the above-mentioned conventional method, the air suction resistance is large in both reciprocating motions, but according to the present invention, the air suction resistance at the time of pulling up can be reduced to facilitate the operation.

Further, according to the inventions of claims 2 and 3, the piston portion is extremely simplified as compared with the conventional one and the invention of claim 1, and manufacturing and assembling are easy. Can be formed at low cost.

[Brief description of drawings]

FIG. 1 is a side view of an entire pump with a partial incision according to a first embodiment of the present invention.

FIG. 2 is a side cross-sectional view of the same main portion, showing a state in which a cylinder is moved upward.

FIG. 3 is an enlarged side sectional view of the piston portion.

4 is a sectional view taken along the line AA in FIG.

FIG. 5 is a sectional view taken along line BB in FIG. 3;

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a side sectional view showing a state where the cylinder is moved downward.

FIG. 8 is a side sectional view showing a second embodiment of the present invention, showing the cylinder when it is moving downward.

9 is a right side view of the piston portion of FIG.

10 is a sectional view taken along line DD in FIG.

11 is a cross-sectional view taken along the line EE in FIG.

FIG. 12 is a side sectional view showing the state of upward movement of the cylinder in the second embodiment.

FIG. 13 is a side sectional view showing a third embodiment of the present invention.

FIG. 14 is a side sectional view showing another embodiment of the check valve on the cylinder upper chamber side.

15 is a cross-sectional view taken along line FF in FIG.

FIG. 16 is a side cross-sectional view showing another embodiment of the check valve on the cylinder lower chamber side.

[Explanation of symbols]

2 ... Base 3 ... Rod 4 ... Piston part 5 ... Cylinder 6 ... Handle 10 ...
Air discharge path 11 ... Inner tube 12 ... Air suction path 13 ...
Outer tube 17 ... Cylinder upper chamber 18 ... Check valve 23 ...
Piston body 26 ... Recessed grooves 27, 29, 30, 33 ...
Passage 28,35 ... O-ring 31,34 ... O-ring 4
2 ... Cylinder lower chamber D ₁ ... Void

Claims (3)

[Scope of utility model registration request] 1. A base (2) having an air discharge passage (14).
A rod (3) consisting of inner and outer double pipes (11) and (13) standing upright, a piston part (4) fixed to the upper end of the rod (3), and the piston part (4) being inserted to move up and down. A cylinder (5) that moves to the bottom, a handle (6) provided at the upper end of the cylinder (5), a cylinder upper chamber (17) and a cylinder lower chamber (42) defined by the piston portion (4). , The air discharge passage (1) inside the inner pipe (11) of the rod (3)
0) and its lower end is the air discharge passage (14) of the base (2)
And the outer pipe (13) and the inner pipe (11) are communicated with the outside through an air suction passage (12) between the outer pipe (13) and the inner pipe (11). 5) The diameter is made slightly smaller than the inner diameter of 5) to form a void (D ₁ ) between them, and O-rings (28) (35) for sealing are provided on the upper and lower portions of the outer circumference of the piston body (23) to provide the above-mentioned structure. Sealing the void (D ₁ ), piston body (23)
In the outer circumference between the O-rings (28) and (35), a concave groove (26) is formed over the entire circumference, and a third passage (30) opening to the upper part of the concave groove (26) and the concave groove (26). Forming a fourth passage (32) opening at the bottom of 26),
Further, a second passage (29) penetrating the piston body (23) in the transverse direction is formed between the passages (30) and (32), and the piston body (23) further has the third passage (3).
0) and the cylinder upper chamber (17) to communicate with each other, the first passage (2
7) and one end of which communicates with the fourth passage (32) and the other end of which is located below the sealing lower O-ring (35) and has a gap (D) between the piston body (23) and the cylinder (5). ₁ )
A fifth passage (33) communicating with the above, and an upper portion of the air suction passage (12) in the rod (3) communicates with the fifth passage (33) via a check valve (41). , The third channel (30) in the concave groove (26).
And O-rings (31) (34) for opening and closing, which are respectively located at the openings of the fourth passage (32) and are made of elastic members, are fitted, and the O-rings (31) and (34) are recessed from the third passage (30) and the fourth passage (32). Groove (2
6) The air flow in the direction is allowed and the air flow in the opposite direction is blocked, and the upper portion of the cylinder upper chamber (17) is connected to the check valve (18).
An air pump characterized by communicating with the outside through a. 2. A base (5) having an air discharge passage (70).
1) A rod (50) made up of a single tube, a piston body (52) fixed to the upper end of the rod (50), and a cylinder (60) that moves up and down by inserting the piston body (52).
And a handle (6) provided at the upper end of the cylinder (60)
And a cylinder upper chamber (65) and a cylinder lower chamber (68) defined by the piston body (52), and the outer diameter of the piston body (52) is slightly smaller than the inner diameter of the cylinder (60). Voids (D ₂ ) (D ₃ ) (D ₄ ) are formed between them, and an upper groove (53) is formed in the upper part of the outer circumference of the piston body (52) and a lower groove (54) is formed in the lower part of the piston body (52) over the entire circumference. O-rings (61) and (62), which are formed over the upper and lower portions, and which are made of elastic members, are provided in the upper and lower grooves (53) and (54), respectively, and their outer circumferences contact the inner surface of the cylinder (60), Is separated from the groove bottoms of both grooves (53) and (54) and is vertically movable. Further, the piston body (52) is provided with the groove (5) of the upper and lower parts.
3) Forming a communication passage (55) located in the middle of (54) and opening to the outer peripheral surface of the piston, and further forming the groove (5) in the upper and lower parts.
3) A communication hole (56) communicating with the communication passage (55) on the surface of the (54) on the side where the communication passage (55) is located.
(57) is formed, and the upper portion of the air discharge passage (58) of the rod (50) communicates with the communication passage (55), and the lower portion of the air discharge passage (7) of the base (51).
0), and further, the cylinder upper chamber (65) is communicated with the outside through the check valve (63), and the cylinder lower chamber (68) is connected.
Is communicated to the outside through a check valve (66). 3. A base (5) having an air discharge passage (70).
1) A rod (50) made up of a single tube, a piston body (52) fixed to the upper end of the rod (50), and a cylinder (60) that moves up and down by inserting the piston body (52).
And a handle (6) provided at the upper end of the cylinder (60)
And a cylinder upper chamber (65) and a cylinder lower chamber (68) defined by the piston body (52), and the outer diameter of the piston body (52) is slightly smaller than the inner diameter of the cylinder (60). Voids (D ₂ ) (D ₃ ) (D ₄ ) are formed between them, and an upper groove (53) is formed in the upper part of the outer circumference of the piston body (52) and a lower groove (54) is formed in the lower part of the piston body (52) over the entire circumference. The piston body (52) is further formed with a communication passage (55) located in the middle of the upper and lower grooves (53) (54) and opening to the piston outer peripheral surface. (5
3) is provided with a U packing (61a) that allows air to flow from the cylinder upper chamber (65) to the communication passage (55) and shuts off air in the opposite direction, and the lower groove (54) has a cylinder lower chamber (61a). 68) is provided with a U packing (62a) that allows air to flow from the communication passage (55) to the communication passage (55) in the opposite direction, and further, the upper portion of the air discharge passage (58) in the rod (50) is connected to the communication passage (55). It communicates with the passage (55), the lower part communicates with the air discharge passage (70) in the base (51), and
An air pump characterized in that the cylinder upper chamber (65) communicates with the outside through a check valve (63) and the cylinder lower chamber (68) communicates with the outside through a check valve (66).