JP2008196476A - Compact type air pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact type air pump having a small volume and being designed to be conveniently portable, in particular, for forcing gas into an air filled object such as a tire. <P>SOLUTION: The first end of a cylinder is provided with an inlet hole and the second end is closed. An air supply channel is provided in an air supply rod passing through its axial direction. A piston device has a piston provided at the second end of the air supply rod and a check valve device provided between the second end of the air supply rod and the piston. The piston and the second end of the air supply rod are inserted into the cylinder, and a center hole and a through-hole are provided in the piston. A head portion is provided at the first end of the air supply rod, and an air nozzle connector is provided on the head portion. When the cylinder is moved relative to the air supply rod in the direction of leaving the head portion, air flows from a vent hole of an upper cover into the cylinder and from the through-hole of the piston into the bottom end of the cylinder, while the air is prevented from flowing out of the center hole by the check valve device. When the cylinder is moved relative to the air supply rod in the direction of head portion, air at the bottom end of the cylinder flows from the center hole to the air supply channel of the air supply rod and then flows out of the head portion and the air nozzle connector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air pump for pumping gas to an air-filled article such as a tire, and more particularly to a compact air pump having a small volume and a design that is convenient to carry.

  In general, most air pumps include a cylinder, a head provided on the cylinder, and an air nozzle connector having one end connected to the head. After the air nozzle connector is connected to the nozzle of the air-filled article, the cylinder is operated to generate compressed gas, thereby forcing the gas through the head and air line into the air-filled article.

  For convenience of carrying, some air pumps are designed in a small volume form, for example, the well-known air pump shown in FIG. 7 includes a cylinder A, a handle B, a head C, an air nozzle D and a crank E provided on the head. Is included. When supplying air, the nozzle D is fitted to the charging nozzle 6 of the air-filled article, then the crank E is raised and the charging nozzle 6 is tightened by the engaging parts inside, and the user grips the handle B. By moving the cylinder A in the axial direction, the gas can be pumped to the charging nozzle 6 through the head C and the nozzle D.

  The disadvantages of the known air pump described above are as follows. During the air feeding process, gas leaks when the nozzle is attached to the tire filling nozzle and the crank is operated. And if the gas pressure in the cylinder is too high, it may fall off. In addition, when supplying air, you must hold the cylinder with one hand and the handle with the other hand, so the overall length cannot be reduced, the volume becomes excessive, and Inconvenient.

  For this reason, the main object of the present invention is that the volume of the known compact air pump is still excessively large and inconvenient to carry, and air leakage occurs when the crank is operated with the nozzle attached during the air supply process. This is to solve the drawback that the cylinder easily drops off when the pressure in the cylinder is excessive.

  The technical means of the present invention includes a cylinder, an air supply rod, a piston device, a head, and an air nozzle connector. An inlet hole is provided at the first end of the cylinder, and the second end is closed. The air supply rod is provided with an air supply channel penetrating the first end and the second end in the axial direction. The piston device includes a piston and a check valve device, the piston is provided at a second end of the air supply rod, and the check valve device is provided between the second end of the air supply rod and the piston. The piston and the second end of the air supply rod are inserted into the cylinder, and a central hole and a through hole are provided in the piston. The head is provided at the first end of the air supply rod, and the air nozzle connector is provided at the head. When the cylinder moves relative to the air supply rod in a direction away from the head, air enters the cylinder through the vent hole of the top lid, and enters the bottom end of the cylinder through the through hole of the piston, and check. The valve device prevents the air from flowing out from the center hole, and when the cylinder moves in the direction of the head relative to the air supply rod, the air at the bottom end of the cylinder passes from the center hole to the air supply rod. The air enters the air supply channel and flows out from the head and the air nozzle connector.

  The above-described technical means of the check valve device includes a check valve seat and a check valve, and the check valve seat has a stepped cylindrical body, one end of which is the second end of the air supply rod. Is inserted into the air channel, the other end is inserted into the piston, and the check valve is located in the check valve seat and is movable between the central hole of the piston and the through hole of the check valve seat. .

  In order to prevent the occurrence of noise or breakage due to collision during movement of the cylinder in the axial direction of the air rod, another technical means of the present invention is that a buffer packing is installed on the air rod inside and outside the cylinder. The buffer packing approaches the head and piston of the air pump, respectively, and the forward travel of the cylinder reaches a limit, preventing the piston from directly colliding with the top cover of the cylinder, and the head and the top cover colliding during the recovery stroke. Can be prevented.

  A feature of the present invention is that a cylinder of an air pump is directly used as a handle, a piston device and an air supply rod are combined in the cylinder, and the piston device includes a check valve seat and a check valve for preventing backflow of the piston and gas. As a result, when not in use, the entire air supply rod can be retracted into the cylinder, whereby the volume of the air pump can be reduced to a minimum level, making it more convenient to carry or store.

  Another feature of the present invention is that the air nozzle connector is connected to the charging nozzle of the air-filled article by a screwing method, which not only facilitates the connection but also makes it more reliable than known techniques, even at high pressures. Make it difficult to drop off. The screw type air nozzle has a small volume and is easier to operate.

  1 and 2 show the appearance of the compact air pump of the present invention. It includes a cylinder 1, an air supply rod 2 inserted into the cylinder 1, a head 4 provided on the air supply rod, and an air nozzle connector 5 provided on the head 4. The air supply rod 2 is movable in the axial direction with respect to the cylinder 1, whereby gas is pumped through the head 4 and the air nozzle connector 5.

  3 and 4 show a preferred embodiment of the combination and structure of the main components of the present invention. For example, it includes a cylinder 1, an air feed rod 2, a piston device 3, a head 4 and an air nozzle connector 5. Among them, the cylinder 1 is a hollow tubular body, and female screws are provided at both ends thereof, of which the upper lid 11 is screwed at the upper end, the bottom lid 12 is screwed at the lower end, and the plurality of vent holes 111 are formed in the upper lid 11. The bottom lid 12 closes the lower end of the cylinder 1.

  The air feeding rod 2 is hollow and has a tubular body whose outer diameter is smaller than the inner diameter of the cylinder 1, and a first male screw 23 and a second male screw 24 are provided at the first end and the second end, respectively. Two hollow spaces constitute an air supply channel 21 penetrating the first end and the second end.

  The above-described piston device 3 includes a piston 31 and a check valve device. An annular groove 310 is provided on the outer periphery of the piston 31, a center hole 311 is provided in the center of the piston 31, and the upper end of the piston 31 is screwed into the second male screw 24 at the second end of the air feed rod 2. A plurality of through holes 312 penetrating the annular groove 310 are provided on the lower surface of the piston 31, and a piston ring 32 is further installed in the annular groove 310.

  The check valve device includes a check valve seat 33 and a check valve 34, and the check valve seat 33 has a stepped shape and is formed into a cylindrical body having a central hole 331 in the middle. Is a soft piece and is placed on a relatively large inner diameter portion of the check valve seat 33 and is movable between the center hole 311 of the piston 31 and the center hole 331 of the check valve seat 33. After the second end of the air supply rod 2 is first passed through the second buffer packing 35, one end of the check valve seat 33 having a relatively small outer diameter is inserted inside the second end of the air supply rod 2, After the check valve 34 is inserted into the relatively large outer diameter end of the check valve seat 33, the check valve seat 33 is further placed in the upper end of the piston 31, and the upper end of the piston 31 and the air supply rod 2. The second male screw 24 is screwed.

  The head 4 described above has air channels penetrating on both sides. A first screw hole 41 and a second screw hole 42 are formed at both ends of the air channel. After the first end of the air supply rod 2 is passed through the first buffer packing 22, the first male screw 23 is screwed into the first screw hole 41 of the head 4, whereby the air channel and the air channel are fed. The air supply channel 21 of the air rod 2 communicates.

  The air nozzle connector 5 of the present invention is a kind of screw-type rotary head, one end of which is screwed into the second screw hole 42 of the head 4 and the other end can be screwed into the charging nozzle 6 of the air-filled article. Yes (see FIG. 6).

  4 and 5 show the operation and gas flow path when air is supplied by the air pump of the present invention. When the user grips the cylinder 1 by hand and moves it in the axial direction with respect to the air feed rod 2 in the direction of the head 4, the check valve 34 is subjected to atmospheric pressure action and the upper end of the check valve seat 33. However, since there are a plurality of side holes at the lower end of the central hole of the check valve seat 33, it is not closed by the check valve 34. Therefore, during this stroke, the air at the bottom end inside the cylinder 1 is centered on the piston 31. It flows into the air supply channel 21 of the air supply rod 2 through the hole and the central hole of the check valve seat 33, and flows out through the head 4 and the air nozzle connector 5 to fill the air-filled article with air (see FIG. 4). When the cylinder 1 moves in the axial direction with respect to the air feed rod 2 in the direction away from the head 4, the air enters the cylinder 1 through the air inlet 111 of the upper lid 11, and passes through the through hole 312 of the piston 31. 1 Enter the bottom end (FIG. 5) and wait for the gas to be pumped during the next charging stroke.

  Since the upper lid 11 may collide with the head 4 to generate noise or be damaged during the above-described charging process, the present invention is configured so that the first buffer packing 22 is a buffer element between the head 4 and the upper lid 11. This prevents the above-mentioned problem. Further, during the recovery stroke, the upper lid 11 may also collide with the piston 31 to generate noise or be damaged. Therefore, the present invention uses the second buffer packing 35 as a buffer element between the piston 31 and the upper lid 11, This prevents the problem.

It is a three-dimensional view of the embodiment of the appearance of the present invention. FIG. 3 is a three-dimensional view of an embodiment in which the cylinder of the present invention is in a stretched state with respect to the air supply rod. It is a three-dimensional exploded view showing a combination relationship of main parts of the present invention. FIG. 3 is a cross-sectional view of an embodiment showing the structure of the present invention and pumping air when a cylinder is operated. FIG. 3 is a cross-sectional view of an embodiment in which air is sucked into a cylinder when the cylinder of the present invention is operated. It is the Example solid view of the connection of the air pump of this invention, and the charging nozzle of an air filling article. It is a three-dimensional view of an example of a known compact type air pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 11 Top cover 111 Air inlet 12 Bottom cover 2 Air supply rod 21 Air supply channel 22 1st buffer packing 23 1st male screw 24 2nd male screw 3 Piston apparatus 31 Piston 310 Annular groove 311 Center hole 312 Through-hole 32 Piston ring 33 Check valve seat 331 Central hole 34 Check valve 35 Second buffer packing 4 Head 41 First screw hole 42 Second screw hole 5 Air nozzle connector 6 Charge nozzle

Claims (3)

In compact air pumps,
The cylinder, wherein an upper lid and a lower lid are respectively installed at the first and second ends opposed to each other, the lower lid closes the second end of the cylinder, and an air inlet is provided in the upper lid. When,
An air supply rod provided with an air supply channel penetrating the first end and the second end in the axial direction; and
A piston device including a piston and a check valve device, wherein a piston ring is provided on an outer periphery of the piston, the piston is provided at a second end of the air supply rod, and the check valve device is provided with the check valve device; A second end of the air rod and the piston, and the piston and the second end of the air supply rod are inserted into the cylinder, and the piston has a central hole and at least a lower side of the piston. The piston device provided with one through hole;
A head comprising a gas channel penetrating both sides, the head being provided at a first end of the air rod, the gas channel being in communication with the air channel of the air rod; The head,
An air nozzle connector that is provided at the head and communicates with the gas channel;
When the above-mentioned cylinder moves relative to the air supply rod in a direction away from the head, air enters the cylinder through the inlet hole of the upper lid, and passes through the through-hole of the piston. When the cylinder moves toward the head toward the head, the air at the bottom end of the cylinder passes through the center hole and the check valve described above, and A compact air pump characterized in that it enters an air supply channel and further flows out through the head and the air nozzle connector.   2. The compact air pump according to claim 1, wherein the check valve device includes a check valve seat and a check valve, the check valve seat is a stepped cylinder, and one end of the check valve device is formed on the air supply rod. The second end is inserted into the air supply channel, the other end is inserted into the piston, and the above-mentioned check valve is located in the check valve seat so that the center hole of the piston and the center hole of the check valve seat A compact air pump characterized in that it can be moved between.   The compact type air pump according to claim 1 or 2, wherein a first buffer packing is provided at a boundary between the outer periphery of the first end of the air supply rod and the head, and the outer periphery of the second end of the air supply rod and the outer periphery of the air supply rod. A compact air pump, wherein a second buffer packing is provided at a boundary portion of the piston.

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