JPH0716055Y2 - Air pump - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pump, and more particularly to an air pump constructed so that a pressure gauge showing an air pressure to be infused can be selectively attached at a position easy to see.

[0002]

2. Description of the Related Art An air pump used for injecting or replenishing air into a pneumatic tire of a bicycle or the like has a cylinder cylinder and an internal cylinder slidable vertically. A piston body that is inserted and has a handle portion at the upper end is provided, and the compressed air generated by the downward movement of the piston body can be sent to an air injection target through a hose.

A storage chamber is formed between the compressed air outlet of the cylinder cylinder and the hose to reduce the pushing down force of the piston body, and at the same time, air having a leveled pressure is continuously supplied to the hose. Some are configured to be sent to. Further, there is also a structure in which a pressure gauge for indicating the pressure in the storage chamber is provided so that the current air pressure inside the air injection target can be known.

By the way, the conventional air pump with a pressure gauge as described above employs a specific structure for mounting the pressure gauge in the storage chamber. For example, a user who purchases an air pump without a pressure gauge. However, it is not possible to easily add the above-mentioned pressure gauge later, and even the manufacturer has no peripheral configuration of the part to which the pressure gauge is attached between the air pump with pressure gauge and the air pump without pressure gauge. Since they are different, it is not possible to separately create a type with a pressure gauge and a type without a pressure gauge while adopting common members.In the end, no matter which type of air pump is manufactured, the cost will increase. I couldn't avoid it.

Further, in the air pump with the pressure gauge, since the storage chamber is generally connected to the lower end of the cylinder cylinder,
In many cases, the above pressure gauge is mounted near the lower end of the cylinder cylinder, and even though it is possible to know the pressure of the air injection target, it is said that the pressure gauge is provided at a position that is easy for the user during air injection work to see. I couldn't say it.

The present invention was devised under the circumstances described above, and uses all the members other than the pressure gauge as common parts, while using the air type with and without the pressure gauge. The pump can be configured and yet
It is an object of the present invention to provide a new air pump configured to mount a pressure gauge at a position that is easy for the user to see.

[0007]

In order to solve the above problems, the present invention takes the following technical means. That is, the air pump according to claim 1 of the present application is a cylinder in which a piston rod having a handle portion at the upper end is vertically reciprocally slidably inserted, and a check valve mechanism that allows only air discharge to the outside is provided at the lower end. A cylinder, a bottomed cylindrical outer body that is externally inserted into the lower end of the cylinder cylinder and forms an accumulator chamber in cooperation with the outer surface of the cylinder cylinder, and air connected to an appropriate portion of the outer cylinder. A delivery hose is provided, and a female screw portion is formed on the inner circumference of the upper end portion of the outer jacket, while a large diameter portion and a male screw portion formed in a predetermined range below the large diameter portion are formed on the outer circumference of the cylinder cylinder. At the same time, the male screw portion is provided with an air passage formed by partially removing the screw thread so that air can flow in a predetermined range from the lower end of the screwed portion in the screwed state with the female screw portion. , Screw the female screw part to the male screw part By, it is characterized by being configured so as to connect the said cylinder tube and the mantle body.

The air pump according to claim 2 of the present application has, in addition to the structure of the air pump according to claim 1, a ring-shaped mounting portion having an inner diameter corresponding to the mountain diameter of the male screw portion, The pressure gauge further comprises a main body for displaying the air pressure introduced from the opening provided in the inner circumference of the mounting portion, and the pressure gauge has the ring-shaped mounting portion externally fitted to the male screw portion of the cylinder cylinder. In addition, it is attached to the cylinder cylinder by being hermetically sandwiched between the upper diameter of the outer shell screwed to the male screw portion and the large diameter portion.

[0009]

[Operation and effect of the invention] By reciprocating the piston rod up and down, the compressed air sent into the storage chamber through the check valve mechanism is leveled to a predetermined pressure without flowing backward to the cylinder cylinder. In this state, it is sent toward the air injecting target through the delivery hose, like the air pump with the storage chamber.

In the present invention, the storage chamber is formed in a special manner so that the pressure gauge can be selectively attached to the air pump body while keeping the same structure as the air pump body. is doing.

That is, according to the present invention, the outer jacket body having a bottomed cylindrical shape is fitted onto the outer circumference of the cylinder tube so as to accommodate a fixed length of the lower end portion of the cylinder tube. The outer peripheral surface of the lower end portion of the cylinder tube forms an annular pressure storage chamber. And
The connecting structure of the outer jacket to the cylinder cylinder is performed by providing a female screw portion on the inner circumference of the tip portion of the outer jacket and screwing the female screw portion to a male screw portion provided on an appropriate portion of the outer peripheral portion of the cylinder cylinder. A large-diameter portion is formed adjacent to the upper end of the male screw portion of the cylinder cylinder. Therefore, the outer sleeve is screwed onto the male screw portion until the upper end hits the large-diameter portion. The outer body and the cylinder tube are connected to each other with the chamber kept airtight to the outside.

Further, in the present invention, an air passage is formed in the male screw portion in a region within a predetermined range from the lower end portion of the region where the male screw portion is formed so that air can flow even when screwed with the female screw portion. There is. More specifically, by removing the threads on the male screw portion, air can be circulated in a certain range in the vertical direction of the male screw portion. However, since this air passage removes only a part of the thread of the male screw portion, the presence of this air circulation passage is not adversely affected in the screwing state of the male screw portion and the female screw portion. Irrespective of, the screw connection between the outer body and the cylinder can be achieved. As described above, the case where the both are screwed and connected until the upper end of the outer shell abuts on the large diameter portion provided on the cylinder cylinder is the case where an air pump of the type described later without a pressure gauge is configured.

On the other hand, in the present invention, by constructing the pressure gauge as follows, it is possible to construct the air pump with the pressure gauge while using the construction of the air pump main body as it is. That is, the pressure gauge according to the present invention has a ring-shaped mounting portion having an inner diameter corresponding to the thread diameter of the male screw portion, and the air pressure introduced from the opening provided in the inner periphery of the mounting portion is displayed on the main body display portion. It is configured to display. The axial length of the ring-shaped mounting portion is set to be shorter than the axial length of the male screw portion provided on the cylinder cylinder and the female screw portion on the outer shell side that is screwed into the male screw portion. Therefore, in a state where the ring-shaped mounting portion of the pressure gauge is externally fitted to the male thread portion of the cylinder cylinder, the female thread portion of the outer jacket is screwed into the male thread portion to connect the outer body and the cylinder cylinder. It is possible to plan. At this time, the ring-shaped mounting portion of the pressure gauge is fitted onto the male screw portion while its upper and lower end surfaces are clamped between the large diameter portion on the cylinder cylinder side and the upper end portion of the outer jacket. Becomes

At this time, as described above, the male screw portion is formed with the air passage which allows the air to flow in the predetermined range from the lower end portion of the male screw portion forming portion. Even if there is a threaded connection with the part,
The pressure storage chamber communicates with the air passage formed by removing the screw thread. Since the inner peripheral surface of the ring-shaped mounting portion of the pressure gauge is a cylindrical inner surface having no threads formed therein, the air passage has a ring shape through the root of the thread of the male thread portion. It will communicate with the opening provided on the inner circumference of the mounting portion.

That is, the storage chamber has an air passage provided by removing the threads as described above, a root of the male thread portion of the fitting portion of the ring-shaped mounting portion, or an opening of the inner circumference of the ring-shaped mounting portion. Via the pressure gauge body. In the air injection state, the internal space of the air injection target communicates with the storage chamber via the hose, so the pressure gauge described above substantially indicates the internal pressure of the air injection target. . As described above, when the pressure gauge of the present invention is attached, the vertical length of the air pump body is increased by the axial length of the ring-shaped attachment portion of the pressure gauge, and any other changes are made. Does not occur.

As described above, according to the air pump of the present invention, it is possible to appropriately mount a pressure gauge for displaying the internal pressure of the air injecting target, while making all the constitutions of the air pump main body completely common. This means that the manufacturer can supply both an air pump without a pressure gauge and an air pump with a pressure gauge without incurring soaring costs. It means that after purchasing the air pump of the present invention, it can be easily changed to an air pump with a pressure gauge if desired.

Further, according to the present invention, since the pressure gauge is mounted between the tip of the outer casing and the inner diameter portion provided on the outer peripheral portion of the cylinder, the pressure gauge is mounted above and below the pressure gauge. The height position is located above the lower end of the air pump main body by the axial length of the outer jacket, and is mounted at a position that is very easy for the user to see.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to the drawings. Air pump 1 of the present invention
As shown in FIGS. 1 and 2, the piston body 3 is vertically reciprocally slidably inserted into a bottomed cylindrical cylinder 2 having a constant inner diameter and a predetermined length. A bottomed cylindrical outer jacket body 4 is externally inserted into the lower portion of the cylinder cylinder 2 to form an annular storage chamber 5 between the lower portion of the cylinder cylinder 2 and the inner wall of the outer jacket body 4, and An air delivery hose 6 is connected to the chamber 5 and is generally configured.

The piston body 3 is constituted by connecting a handle member 8 having a substantially T-shape in a front view to the upper end of a hollow piston rod 7 sliding inside the cylinder tube 2. In the present embodiment, the shaft portion 8a of the handle member 8 is provided with a bottomed storage space 10 having an open upper portion partitioned by a partition wall 9 as shown in detail in FIG. It is designed so that small items such as various attachments that can be appropriately detached and used can be collectively stored without fear of loss. This storage space 1
The upper opening of 0 can be opened and closed as appropriate by the lid 11.

Further, on the side surface of the shaft portion 8a of the handle member 8, a pair of clamp pieces 12, 12 capable of holding the tip portion of the hose are integrally formed. Further, a through hole 13 is formed on the surface of the shaft portion 8a located between the clamp pieces 12, 12 so that air is communicated between the storage space 10 and the outside. Further, a plurality of air holes 14 ... Are also formed in the partition wall 9 forming the bottom of the storage space 10. By the air holes 14 and the through holes 13,
The inner space of the hollow piston rod 7 is substantially electrically connected to the outside.

At the lower end of the piston rod 7, when the piston rod 7 moves downward and the volume of the air pressure chamber 15 is reduced, the compressed air of the air pressure chamber 15 enters the hollow portion of the piston rod 7. On the contrary, when the piston rod 7 moves upward and the volume of the pneumatic chamber 15 expands without backflowing, the air in the hollow portion of the piston rod 7 is forced to flow in the pneumatic chamber 1 described above.
A valve mechanism 16 is introduced to allow the quick upward movement of the piston rod 7 introduced into the valve mechanism 5.

The valve mechanism 16 is, in this embodiment,
It is configured as follows. As shown in detail in FIG. 4, an O-ring 17 is formed on the outer periphery of the lower end portion of the piston rod 7.
A first annular groove 18 in which is housed with play, and a second annular groove 20 sandwiching an annular ridge 19 on the annular groove 18.
Is formed. The bottom wall of the second annular groove 20 and the internal space of the piston rod 7 are communicated with each other by a vent hole 21, and the outer diameter of the annular ridge 19 is slightly larger than the inner diameter of the cylinder tube 2. It is made small, and between the inner peripheral surface of the cylinder cylinder 2 and the outer peripheral surface of the annular protrusion 19,
A gap is formed through which air can flow. Further, in the flange 22 adjacent to the lower side of the first annular groove 18,
As shown in FIG. 8, a slit 23 that is deeper than the depth of the first annular groove 18 is formed, whereby the pneumatic chamber 15 and the O-ring 17 are loosely mounted. It communicates with the annular groove 18.

When the piston rod 7 moves downward to compress the air pressure chamber 15, the O-ring 17 is brought into close contact with the upper wall 18a of the first annular groove 18, whereby the cylinder cylinder 2
The gap between the inner peripheral surface of the and the outer peripheral surface of the annular projection 19 is sealed. Therefore, the air in the pneumatic chamber 15 does not flow back into the space outside the piston rod 7. On the other hand, when the piston rod 7 moves upward and the volume of the air pressure chamber 15 increases, the pressure in the air pressure chamber 15 becomes a negative pressure,
As a result, the O-ring 17 is attached to the lower wall 18 of the annular groove 18.
As shown in b, the gap between the inner peripheral surface of the cylinder tube 2 and the outer peripheral surface of the annular projection 19 is opened at this time. Therefore, the pneumatic chamber 15 and the piston rod 7
The internal space of the slit 23, the first annular groove 18,
It is made to flow through the gap between the inner peripheral surface of the cylinder tube 2 and the outer peripheral surface of the annular protrusion 19, the second annular groove 20, and the ventilation hole 21. As a result, as the volume of the pneumatic chamber 15 increases due to the upward movement of the piston rod 7, the air in the internal space of the piston rod 7 passes through the above-mentioned path and the pneumatic chamber 1
It is introduced into the piston 5 to help the piston rod 7 move upward quickly. Since the air in the piston rod 7 is supplied to the air pressure chamber 15 as described above, external air is supplied to the piston through the air hole 14 in the partition wall 9 and the through hole 13 provided in the shaft portion 8a of the handle member 8. It is replenished in the rod.

Then, when the pressure in the air pressure chamber 15 exceeds a predetermined value, the air in the air pressure chamber 15 is sent to the pressure storage chamber 5 in the bottom wall portion of the cylinder cylinder 2, and vice versa. A check valve mechanism 24 is provided to prevent the internal air from flowing back to the pneumatic chamber 15 in the cylinder cylinder. This check valve mechanism 2
No. 4, which has a generally known configuration, may be adopted, and a detailed description thereof will be omitted.

The outer jacket 4 which is externally fitted to the cylinder cylinder 2 from below in order to form the storage chamber 5 in cooperation with the outer peripheral surface of the lower part of the cylinder cylinder 2 has a bottomed cylinder shape as a whole. However, in the present embodiment, for convenience of molding,
It is configured by closing the lower end opening of the upper and lower open inverted tubular outer body body 4a with a separately formed bottom lid 4b.

The connection between the outer jacket 4 and the cylinder tube 2 is achieved as follows. First, on the cylinder cylinder 2 side, a large diameter portion 25 and a male screw portion 26 formed within a predetermined length below the large diameter portion 25 are formed. As shown in FIGS. 5 and 9, the male screw portion 26 has a range of a predetermined length in the vertical direction from the lower end portion.
An air passage 28 formed by partially cutting off the screw thread is provided so that air can flow in a screwed state with the female screw portion 27 on the outer jacket body 4 side described later. In this embodiment, the air passage 28 is formed by forming a flat surface on the outer peripheral portion of the male screw, which is cut to a depth slightly deeper than the depth of the thread.

On the other hand, a female screw portion 27 that can be screwed into the male screw portion 26 is formed on the inner peripheral surface of the upper end portion of the outer jacket 4. The female screw portion 27 is inserted into the male screw portion 26 so that a ring-shaped mounting portion 32 of a pressure gauge 31 described later is sandwiched between the upper end of the outer jacket 4 and the large diameter portion 25, or as shown in FIG. The upper end of the outer jacket body 4 is screwed into the large diameter portion 25 so as to directly contact the large diameter portion 25, whereby the cylinder tube 2 and the outer jacket body 4 are fixedly connected. In addition,
In the illustrated example, the upper end portion of the outer jacket 4 and the large diameter portion 2 are
By interposing the O-ring 29 at the contact portion with 5, the airtightness at the screwed connection portion of both is highly secured.

Reference numeral 29 in FIGS.
Shows a foldable and rotatable pedal provided at the lower end of the outer cover 4. An air delivery hose 6 that communicates with the storage chamber 5 is connected to the side surface of the lower end portion of the outer jacket 4. As shown in FIG. 10, a base 30 is attached to the tip of the hose 6 so that attachments ((a) to (e) in FIG. 12) according to the object of air injection can be easily attached and detached. .

In the present invention, the pressure gauge 31 having the following structure can be selectively installed as appropriate without changing the air pump body having the above structure. As shown in FIGS. 4 and 5, the pressure gauge 31 includes a ring-shaped mounting portion 32 having a cylindrical inner surface having an inner diameter corresponding to the crest diameter of the male screw portion 26 formed on the cylinder barrel 2, and this mounting portion. 32 is provided integrally with the main body 33, and the pressure introduced from the opening 34 formed in the inner peripheral surface of the mounting portion 32 is measured and displayed on the display provided on the upper surface of the main body 33. Has become. In addition, the mounting portion 32
The vertical width of is set shorter than the axial length of the male screw portion 26.

As shown in FIG. 5, the pressure gauge 31 has a ring-shaped mounting portion 3 on the outer periphery of the male screw portion 26.
In the state in which 2 is fitted, the male screw portion 26 and the female screw portion 27 of the outer jacket body 4 are screwed together to be attached. That is, in the mounted state, the ring-shaped mounting portion 32 is externally fitted to the male screw portion 26, and at the same time, is clamped between the upper end of the outer jacket body 4 and the large diameter portion 25 on the cylinder barrel 2 side by the screw tightening force. It will be good to be done. Even in this case, if the O-ring 17 is provided at the contact portion between the ring-shaped mounting portion 32 and the large-diameter portion 25, the pressure tightness of the storage chamber 5 or its pressure measuring system with respect to the outside. Is secured, which is convenient.

In the storage chamber 5, the air passage 28 formed by removing a part of the thread of the male screw portion 26 as described above, or the screw of the male screw portion in the range where the ring-shaped mounting portion 32 is externally fitted. It will communicate with the opening 34 provided in the inner peripheral surface of the mounting portion 32 through the valley portion of the. Therefore, the pressure of the storage chamber 5 acts on the pressure gauge main body 33 from the opening 34, and as a result, the pressure gauge 31 displays the internal air pressure of the storage chamber 5. As described above, the ring-shaped mounting portion 3 can be clearly seen by comparing FIGS. 5 and 11 with and without the pressure gauge 31.
Only the overall height corresponding to the vertical width of 2 is changed, and the constituent members of the main body portion of the air pump 1 do not require any change.

In the above structure, the piston body 3 is reciprocally moved up and down to send the compressed air generated by the pneumatic chamber 15 into the storage chamber 5, and the pressure increase in the storage chamber 5 causes the hose 6 to pass through. The compressed air can be sent to the air injection target. The inside of the air injection target and the above-mentioned storage chamber 5
Since they are communicated with each other via the hose 6, the pressure gauge 31 displays the internal pressure of the air-injected object, which gradually rises by sending compressed air, moment by moment.

Further, in the present invention, by utilizing the special connection structure between the outer casing 4 and the cylinder tube 2, a pressure gauge is provided at a portion corresponding to the upper end height of the cylinder tube 2 having a predetermined height in the vertical direction. Since the pressure gauge 31 is provided, the pressure gauge 31 is located at a relatively close position for an operator who uses the air pump 1, and it is easier to confirm the pressure display.

Of course, the scope of the present invention is not limited to the above embodiments. The specific shape of each component can be appropriately changed within the spirit of the present invention. In particular, the air passage 28 to be provided in the male screw portion 26 is achieved by providing a flat surface on the outer peripheral portion of the male screw portion in the embodiment, but it may be formed by positively forming a longitudinal groove. Good.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of an air pump of the present invention.

FIG. 2 is a partially cutaway vertical sectional view of the embodiment shown in FIG.

FIG. 3 is an enlarged vertical sectional view of a handle portion.

FIG. 4 is a vertical cross-sectional view showing details of a connecting structure between a cylinder and an outer jacket.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a view taken in the direction of the arrow VI in FIG. 2, and is a view showing a part in a cutaway section.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along the line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is an enlarged cross-sectional view showing details of a connecting structure between a hose tip and a base.

FIG. 11 is a view corresponding to FIG. 5 when a pressure gauge is not attached.

FIG. 12 is an external view showing an example of an attachment that is easily attached to and detached from a mouthpiece at the tip of a hose.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air pump 2 Cylinder cylinder 3 Piston body 4 Outer shell body 5 Storage chamber 6 Air delivery hose 24 Check valve mechanism 25 Large diameter portion 26 Male screw portion 27 Female screw portion 28 Air passage 31 Pressure gauge 32 Ring-shaped mounting portion 34 Opening

Claims (2)

[Scope of utility model registration request] 1. A cylinder cylinder in which a piston rod having a handle portion at its upper end is slidably inserted in a vertically reciprocating manner, and a check valve mechanism is provided at its lower end to permit only air discharge to the outside, and a lower end portion of this cylinder cylinder. A bottomed cylindrical outer jacket body that is externally inserted into the outer cylinder body to form a storage chamber in cooperation with the outer surface of the cylinder cylinder; and an air delivery hose connected to an appropriate portion of the outer jacket body. While forming a female screw portion on the inner circumference of the upper end of the cylinder cylinder, a large diameter portion and a male screw portion formed in a predetermined range below the large diameter portion are provided on the outer circumference of the cylinder cylinder, and the male screw portion is An air passage formed by partially removing threads so that air can flow in a predetermined range from the lower end of the threaded portion in a threaded state with the female threaded portion is provided, and the female threaded portion is formed on the male threaded portion. By screwing it together, Characterized by being configured to connect the overcoat member, the air pump. 2. A pressure gauge further comprising a ring-shaped mounting portion having an inner diameter corresponding to the crest diameter of the male screw portion, and a main body portion for displaying air pressure introduced from an opening provided in an inner circumference of the mounting portion. This pressure gauge has the ring-shaped mounting portion fitted onto the male screw portion of the cylinder cylinder, and has an airtightness between the upper end of the outer shell screwed to the male screw portion and the large diameter portion. The air pump according to claim 1, which is attached to the cylinder cylinder by being sandwiched.