JPH1090100A - Pneumatic pressure gauge for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pneumatic pressure gauge for a tire by means of which the pneumatic pressure of the tire can be measured easily even for an unskilled person without causing any leak of air. SOLUTION: A guide hole 12G for guiding and receiving the connector of a tire valve is made in a body 12. A push rod 15G pushing the valve spindle of a tire is normally retracted by means of a spring 16 and a packing member 28 is provided with a through hole 28A for projecting the push rod 15G when an upper cover 14 is shifted to the base part of the guide hole 12G.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure gauge which is mounted on a tire valve and measures tire pressure.

[0002]

2. Description of the Related Art As a conventional tire pressure measuring instrument, for example, at the time of measurement, when the measuring instrument is pressed against a valve of a tire, a projection at the center of the measuring instrument presses a spindle of the valve, and the internal air pressure is measured. There is something that is designed to lead to a measurement meter. In this air pressure measuring instrument, in order to prevent air from leaking, it is necessary to completely seal the tire air pressure by contacting the air and the sealing gasket of the air pressure measuring instrument with the base of the valve stem.

[0003] A conventional tire pressure gauge can measure from 0 atm.

[0004]

However, in such a conventional tire pressure measuring instrument, since a projection for opening a valve on the tire side is fixedly protruded, the tire pressure is measured at the stage of starting the measurement. The valve on the side of the valve opens, and there is a problem that air leaks before the stem cap portion of the valve and the sealing gasket of the measuring meter completely seal the air pressure.

[0005] For this reason, in measurement, it is necessary to quickly press against an accurate positional relationship. However, the air pressure is not measured very often, and is about every two months or three months, so that it is difficult to master. Generally, a valve of a tire stops at an indefinite angle of 360 ° at a position where the tire stops rotating, and protrudes from the tire at an inclined angle.

[0006] On the other hand, in the case of an air pressure meter, a part to be applied to a tire base is generally set at a certain angle with respect to a shaft portion for displaying pressure, so that an amateur presses the air pressure once so that air pressure does not leak. It is difficult. For this reason, the pressing angle is adjusted with the air leaking, but if the interval is long, the air pressure that has been bent may decrease.

[0007] The present invention has been made in view of such a conventional problem, and if the measuring instrument is simply applied to the base when measuring the tire air pressure, the central projection is retracted by the force of the return spring. Therefore, no air leakage occurs. In this state, the parallelism between the base and the measuring meter is given, then the pressing force is applied, and at the same time the force is applied to the packing and the air is sealed, so that the air pressure of the valve measuring meter can be almost prevented. The purpose is to provide a total.

Further, the conventional tire pressure gauge is made so as to be able to measure from 0 atm, so that it has a long overall length. For this reason, it was inconvenient to carry around constantly. Generally, if it is limited to a normal passenger car, its air pressure is in a range of 1.6 to ² kg / cm ² .
Display of 6 or less is unnecessary, and there is a problem that the portion for displaying the pressure of this portion is unnecessarily long. If the scales are equally spaced, a scale of 0 to 1.6 will be twice as large as 0.8 of a scale of 1.6 to 2.4, and if this part is eliminated, it will be 1/3 when looking at the scale part alone Will be.

[0009]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a tire pressure measuring instrument which is detachably mounted on a base of a tire valve and measures the air pressure in the tire. A body detachably attached to the base, a lower cover fixed to the body, an upper cover movably provided on the inner periphery of the lower cover, and an initial load between the upper cover and the body. A cylinder member integrally provided with a spring and a push rod that moves in the axial direction integrally with the upper cover to press the spindle shaft of the tire valve to open the tire valve and introduce air pressure, and housed in the cylinder member The piston member is moved by the air pressure introduced from the cylinder member, and the piston member is urged by providing an initial load and displaced by the magnitude of the air pressure. It has a changeable spring and a display unit provided on the outer periphery of the cylinder member to indicate the amount of movement of the piston member. A guide hole is formed in the body to guide and house the base of the tire valve. A packing member having a through hole from which the push rod projects when the cover is moved is provided.

[0010] In addition, an ear portion projecting in a direction perpendicular to the axis is provided at a front end portion of the body, and a mounting hole is formed in the ear portion.
According to the tire air pressure meter of the present invention having such a configuration, the tire base is housed in the guide hole of the body at the time of measurement, and the packing attached to the base end of the guide hole and the tire base are parallel. After adjusting the positional relationship so that it is in close contact, when the upper cover is moved with pressing force, the push rod protrudes from the hole provided in the center of the packing and presses the spindle of the tire valve to release the tire air pressure into the cylinder. Since the guide is applied, a force is simultaneously applied to the packing and the air is sealed, so that almost no air leakage occurs.

This is because, before the upper cover is strongly pressed, the push rod at the center portion has a predetermined size to the head of the spindle of the valve of the tire by a spring installed with an initial load between the upper cover and the body. Then, when the upper cover was pressed to measure the tire pressure, the packing was pressed against the tire base with the pressing force from the state where the packing and the tire base were in contact, and the air was sealed. Since the push rod protrudes through the through hole of the packing and moves to open the valve, even a layman can measure the tire air pressure without air leakage.

Further, since a spring force is set with an initial load on a piston which is moved by air pressure, the piston does not move until a pressure commensurate with the initial load. If the measurement is limited to the air pressure measurement for passenger cars as described above, the practical pressure is 1.6 to 2.4 kg / cm ² , and the initial load applied to the piston is 1.4 kg / c with a margin.
It is set so as to move from m ² 0~1.4kg / cm ²
Since there is no need for the scale dimension up to the above, the overall length can be shortened.

With such a structure, the pneumatic pressure meter of the present invention can be made small and lightweight, and an ear is provided at the tip of the body so as to protrude in a direction perpendicular to the main body. By forming the mounting hole, it can be always carried as a part of the key ring.

[0014]

FIG. 1 is a front view of a tire pressure meter according to an embodiment of the present invention, and FIG. 2 is a plan view. 1 and 2, reference numeral 10 denotes a tire pressure meter. The tire pressure meter 10 is fixed to a body 12 removably inserted into a tire base and has a lower cover 11 having a serration 11B on its outer periphery, and a lower cover 11. The upper cover 14 is mounted so as to be able to be pushed in the axial direction.

The upper cover 14 is made of a transparent plastic material, and a scale display portion 15F stored in the inside and displayed on a cylinder member which will be described later will be visible from the outside. The scale display section 15F has a slit 15L formed in the axial direction when viewed from the plan view of FIG.
The end of the pressure indicating portion 23C provided on the built-in piston, which will be described later, is located in the slit 15L.

An ear 12H is formed integrally with the body 12 in a direction perpendicular to the axis, and a mounting hole 12I is formed in the ear 12H.
Are formed. The tire pressure meter 10 is small and lightweight as a whole, and has an ear portion 12H so that it can be always carried as a part of a key ring. FIG. 3 and FIG.
This is a measurement state by air pressure introduction by pushing in. FIG. 4 is a plan view of FIG.

Referring to FIG. 3 and FIG.
When the air pressure is introduced from the tire into the tire air pressure meter 10 by pushing, the built-in piston makes a stroke according to the air pressure, and as shown in FIG. To display the value of the introduced air pressure. In this case, the pressure indicating section 23C has moved to the maximum pressure position. In the this embodiment, the scale display part 15F and obtained scale ^{1.4kg / cm 2 ~2.6kg / cm 2} , it is possible to measure the tire pressure in this range.

FIG. 5 is an axial cross-sectional view of the tire pressure meter shown in FIG. 1. The upper half shows a state when the upper cover 14 is not pressed in without measurement, and the lower half shows a tire air pressure. The state when the tire pressure is measured with the upper cover 14 pushed in is shown. In FIG. 5, reference numeral 12 denotes a body, and a guide hole 12G is formed in the body 12, and a tire base is removably inserted into the guide hole 12G. The guide hole 12G has a function of guiding to the valve base, and has no screw portion for fixing to the valve base.

A guide hole 12G that can be removably inserted into the valve base is formed instead of the screw portion. Guide hole 1
A packing 28 made of a flexible material such as rubber is adhered to the bottom of the 2G, and the packing 28 has a through hole 28A.
Are formed. The body 12 has a through hole 12F communicating with the through hole 28A of the packing 28. When the measurement of the tire air pressure is to be started by inserting the valve base into the guide hole 12G, the push rod 15G integrally formed at the tip of the cylinder member 15 has the through hole 1G.
5F and 28A, but when a pressing force is applied to measure, the push rod 15G
F, 28A is protruded and the spindle of the tire valve is pushed to open the valve.

At this time, a pressing force is applied to the valve base and the packing 28 from the contact state, and at the same time, a force is also applied to the packing 28 to seal the air and almost prevent the air from leaking. An ear 12H is integrally formed at the tip of the body 12 so as to protrude in a direction perpendicular to the axis.
2I are formed. The tire pressure meter 10 is small and lightweight as a whole, and can be always carried as a part of a key holder by attaching the ear 12H.

A cylindrical seal cylinder portion 12C is formed following the through hole 12F of the body 12, and a retainer groove 12B for receiving the spring 16 is formed on the outer peripheral end surface thereof. A fitting groove 12D for fitting and fixing the lower cover 11 and a guide rib 12A guided by a guide groove 11D formed inside the lower cover 11 are formed on the outer peripheral portion of the body 12. Body 1
2, a lower cover 11 is attached and fixed from the right side.

The lower cover 11 is a cylindrical member opened on both sides, and has a fitting projection 11A formed on the left inner end fixed to the body 12 side. A guide groove 11D that fits into the guide rib 12A of the body 12 is formed. For the lower cover 11 fitted and fixed to the body 12, the upper cover 14
Are movably incorporated in the direction of the body 12. The upper cover 14 is formed of a transparent plastic material so that the internal structure can be seen from the outside.

A cylinder member 15 is housed in the upper cover 14 movably incorporated on the body 12 side with respect to the lower cover 11 with a disk 27 housed at the right end. Are integrally slidably mounted in the axial direction, and are pressed against the right side of the upper cover 14 by being pressed by the mounting of the holding spring 16 against the retainer groove 12B of the body 12.

A push rod 15G is formed at the tip of the cylinder member 15 on the body 12 side, and a seal piston 15C is formed following the push rod 15G.
A groove 15I for mounting the O-ring 17 is formed around the seal piston 15C. Seal piston 1
Following 5C, a cylindrical cylinder chamber 15D is formed,
A slide ring 15H is formed on the outer peripheral portion of the cylinder chamber 15D so as to be in contact with the upper cover 14 located outside. At a plurality of locations on the outer periphery of the slide ring 15H, ventilation grooves 15M are formed in the axial direction.

The guide portion 15 is provided at the rear of the cylinder chamber 15D.
E is integrally formed, and slits are formed at two positions facing the guide portion 15E in the radial direction. Cylinder member 1
The push rod 15G formed at the tip of the fifth 5 is provided with a vent hole 15J and protrudes from the seal piston 15C, so that the tire air pressure can be introduced into the internal cylinder chamber 15D by the vent hole 15J.

A scale display section 15F is formed along a slit formed in a rear guide section 15E following the cylinder chamber 15D. The cylinder member 15 slid into the upper cover 14 receives a holding spring 16 incorporated between the upper cover 14 and the body 12 with a spring receiver 15 </ b> A. 27B.

The push rod 1 of the cylinder member 15
Groove 15I of seal piston 15C formed outside 5G
, An O-ring 17 is mounted. When the cylinder member 15 pushes the upper cover 14 to the left, the cylinder member 15 moves against the holding spring 16, and the push rod 15G
Is pushed through the through hole 12F of the body 12 and the through hole 28A of the packing 28.

Before the upper cover 14 is pressed, the push rod 1 is pushed by the holding spring 16 provided with an initial load between the upper cover 14 and the body 12.
5G is a predetermined distance A from the head of the spindle of the tire valve, here to the surface of the packing 28. At the same time, the seal piston 15C is fitted into the seal cylinder portion 12C of the body 12 with a seal by the O-ring 17,
A sealed space for introducing air pressure of the tire from the through hole 12F of the body 12 to the cylinder chamber 15D is formed.

A piston 23 is slidably mounted in a cylinder chamber 15D of the cylinder member 15 by mounting an O-ring 24. A return spring 26 is incorporated between the piston 23 and the disk 27 located behind. The disc 27 is formed integrally with a guide portion 27A into which the right side of the return spring 26 is fitted.
6 is suppressed. At the right end of the piston 23, a pressure indicator 23 flared in the radial direction is provided.
C is formed integrally.

The pressure indicating section 23C is a cylinder member 1
The pressure indication value is shown in two slits on the rear side of 5 and shown on the scale display section 15F as shown in FIG.
The pressure indicating section 23C is desirably colored red or yellow for easy viewing from the outside. A sleeve 22 is incorporated on the left air introduction side of the piston 23 housed in the cylinder member 15. The sleeve 22 has a vent hole 22E.
The two portions 22B extend from the sleeve main body 22A provided with a contact portion 22C at the tip of the two portions 22B.

The sleeve 22 is formed by fitting the two parts 22B into the ventilation holes 15J of the cylinder member 15.
It is incorporated in the part of the push rod 15G. The sleeve 22 moves together with the cylinder member 15 when the upper cover 14 is pushed to the left, and before the stopper surface 15B of the cylinder member 15 comes into contact with the end surface of the seal cylinder portion 12C of the body 12 and stops, the end surface of the body 12 is stopped. The contact portion 22C of the sleeve 22 comes into contact with 12E, and slightly moves the piston 23 rightward.

The movement of the piston 23 due to the contact with the end surface 12E of the sleeve 22 causes the piston 2 to move.
3 can be released from the state in which the O-ring attached to the cylinder member 15 is in close contact with the peripheral surface of the cylinder chamber 12D of the cylinder member 15 without using for a long period of time. Make sure that the movement of.

In order to move the piston 23 by contact with the end surface 12E of the sleeve 22, the stopper surface 15B of the cylinder member 15 and the seal cylinder portion 12 of the body 12 are moved.
The distance (b) from the contact portion 22C of the sleeve 22 to the end surface 12E on the body 12 side with respect to the distance (a) from the end face of C.
Is shortened by the amount of forced movement of the piston 23.

In the initial state where the tire air pressure is not introduced, the return spring 2 on the right side of the piston 23
6 is communicated with the cover chamber of the lower cover 11 by the slit of the cylinder member 15 and the ventilation groove 15M on the outer periphery. The cover room of the lower cover 11
The ventilation groove 14F of the upper cover 14 and the ventilation groove 11F provided in the right opening of the lower cover 11 communicate with the outside.

As a result, the outside and the chamber 20 incorporating the return pulling 26 on the right side of the cylinder 23 communicate with each other and are opened to the atmosphere, and the piston 23 strokes rightward due to the introduction of tire pressure to the left side of the piston 23. At that time,
The stroke position is determined only by the force of the return spring 26. The disk 27 housed on the inner end surface in the upper cover 14 is the most visible portion when the tire air pressure meter 10 is mounted on the tire base of the tire.
Therefore, the surface of the disk 27 can be used as a member for displaying various information.

Specifically, a sheet member such as paper or plastic on which photographs and characters are printed on the surface located on the front side of the disk 27 can be stored. Disk 27
A cylinder receiver 27B, a retainer groove 27C of the return spring 26, and a guide portion 27A of the return spring 26 are formed from the outer periphery on the end face opposite to the front side on which a sheet member such as a photograph or printed paper is placed.

In addition, a ventilation hole 27D communicating with both sides is formed at the center of the guide portion 27A. This vent 2
By providing the 7D, when the disc 27 is inserted into the upper cover 14, the air on the closed side is exhausted from the ventilation hole 27D,
The disk 27 can be inserted smoothly. Of course, a cutout communicating in the axial direction may be formed in the outer peripheral portion instead of the ventilation hole 27D.

Further, when a photograph or a printed sheet member is put on the surface side of the disk 27, a convex lens is formed on the cap-shaped end of the upper cover 14 made of a transparent material so that the portion can be enlarged and displayed. May be integrally formed so that photographs, characters, and the like sandwiched on the surface side of the disk 27 can be displayed in an enlarged manner. FIG. 6 is a side view of FIG.

In FIG. 6, reference numeral 12 denotes a body, and a cylindrical lower cover 11 is fixed to the outer periphery of the body 12. A guide hole 12G is formed in the body 12, and a tire cap is inserted into the guide hole 12G. Guide hole 12
Since the thread portion is not formed in G, this tire air pressure meter 10 is not screwed and fixed to the tire base, but is removably inserted into the tire base. The guide hole 12G has a packing 2 formed of a flexible material such as rubber.
8 are adhered, and the packing 28 is formed with a through hole 28A.

When the upper cover 14 is to be pushed in,
The push rod 15G integrally formed at the tip of the cylinder member 15 does not protrude toward the tire base from the through hole 12F formed in the body 12 and the through hole 28A formed in the packing 28. The push rod 15G protrudes from the through holes 15F and 28A and pushes the spindle of the tire valve to open the valve. In this case, the packing 2
The force is also applied to 8 and the air is sealed, so that there is almost no air leakage.

An ear 12H is formed integrally with the tip of the body 12 in a direction perpendicular to the axis.
Is formed with a mounting hole 12I. By providing the ears 12H, the user can always carry it as a part of the key ring. Next, in FIG.
The operation of measuring the tire pressure by pushing the upper cover 14 to the left will be described.

As shown in the upper half of FIG.
When the tire 4 is not pressed to the left, the tire cap is inserted into the guide hole 12G of the body 12. The tire pressure gauge 10 is in a state of being inserted into the tire base, the outer peripheral portion of the tire base is in contact with the packing 28 provided in the guide hole 12G, and the push rod 15G is connected to the through hole 15.
F, not inserted into 25A.

In this state, when the upper cover 14 is pushed in with a finger, the internal cylinder member 15 moves at the same time as the upper cover 14 moves to the left. Cylinder member 15
Is moved, first, the sleeve 22 incorporated in the tip
Abutment portion 22C of end surface 1 of through hole 12F on body 12 side
Contact 2E. For this reason, the movement of the sleeve 22 stops, and when the sleeve 22 is further pushed, the piston 23 moves through the sleeve 22.
Is stopped, the cylinder member 15 moves to the left.
At this time, even if the O-ring 24 is stuck to the inner peripheral surface of the cylinder chamber 15D, the O-ring 24 is detached by the relative movement of the piston 23 and the cylinder member 15, thereby facilitating the movement of the piston 23 by introducing air pressure thereafter.

When the cylinder member 15 is further moved leftward by the upper cover 14, the stopper surface 15B of the cylinder member 15 comes into contact with the end surface of the seal cylinder portion 12C on the body 12 side. In this state, the push rod 15G provided at the tip of the cylinder member 15 is
2F and the through-hole 28A of the packing 28 protrudes to the position indicated by the lower half, and the seal piston 15C on the tip end side of the cylinder member 15 is inserted into the seal ring portion 12C on the body 12 side, and the O-ring 17 Body 1
The space from the second through hole 12F to the cylinder chamber on the left side of the piston 23 is sealed.

When the push rod 15G protrudes through the through hole 12F of the body 12 and the through hole 28A of the packing 28, the spindle protrudes at this position in an assembled state with respect to the tire mouthpiece. When released, the tire pressure is introduced into the tire pressure meter 10 through the through hole 12F.

In this case, since the tire base and the packing 28 are in contact with each other, a pressing force is applied to the packing 28 to seal the air, so that there is almost no air leakage. As a result, the tire pressure is received by the left chamber 18 of the piston 23 and moves to the right against the return spring 26 by the air pressure introduced by the piston 23. The piston 23 stops at a position where the force of the tire pressure in the left chamber 18 and the force of the right return spring 26 are balanced.

When the piston 23 is in a stopped state, a pressure indicating portion 23C formed in an ear shape at the right end of the piston 23 is formed.
However, as shown in FIG. 4, a scale display portion 15F in the slit 15L is provided.
At an appropriate position, and the pressure value of the introduced tire pressure is displayed. For this reason, when checking tire pressure,
The state of the tire pressure can be immediately known only by looking at the display of the tire pressure meter 10. When the measurement of the tire air pressure is completed and the upper cover 14 is released, the holding member 16 returns the cylinder member 15 and the upper cover 14 to the initial state.

At this time, the tire pressure introduced into the left chamber 18 of the piston 23 is
E, through the vent hole 15J of the cylinder member 15, enters the cover chamber of the lower cover 11, further passes through the vent groove 14F of the upper cover 14, and the vent groove 11F of the lower cover, and is opened to the atmosphere. As is clear from FIG. 5, the upper cover 14 and the cylinder member 15 serving as the display side moving in the axial direction can be rotated to arbitrary positions around the axis with respect to the body 12 and the lower cover 11 serving as the fixed side. it can.

For this reason, as shown in FIGS. 2 and 4 with the tire air pressure meter 10 attached to the tire base,
The upper cover 14 can be rotated so that the pressure indicating section 23C comes to a position that is easy to see. In the present embodiment, the guide hole 1 of the body 12 is measured when the tire pressure is measured.
Since the packing 28 provided on the 2G and the tire base come into contact with each other to apply a pressing force to the packing 28 and seal the air, the push rod 15G of the cylinder member 15 opens the valve. Can be measured.

Since the tire pressure meter 10 is small and lightweight as a whole, it can be always carried as a part of a key holder by attaching the ear 28 to the body 12. The bar-type air pressure gauges already on the market and the fixed-type central projection of the pressing port of the dial-type air pressure gauge against the tire valve are retracted with a spring when not normally used, and are pushed out from the rear during measurement. The fact that air leakage can be prevented at the time of measurement can be easily applied as an application of the present invention.

[0051]

As described above, according to the present invention, the push rod for pushing the spindle of the tire valve can be brought into contact with the base in a state where the push rod is retracted by the spring. Since air is sealed by applying force, tire pressure can be measured with almost no air leakage. Further, since the piston is provided with the initial set pressure, the piston can be miniaturized and can always be carried as a part of the key ring.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view showing a measurement state.

FIG. 4 is a plan view of FIG. 3;

5 is an axial sectional view of FIG. 3;

FIG. 6 is a side view of FIG.

[Explanation of symbols]

 10: Tire air pressure meter 11: Lower cover 11A: Fitting protrusion 11B: Serration 11D: Guide groove 11F: Vent groove 12: Body 12A: Guide rib 12B: Retainer groove 12C: Seal cylinder part 12D: Fitting groove 12E: End face 12F : Through hole 12G: Guide hole 12H: Ear portion 12I: Mounting hole 14: Upper cover 14F: Vent groove 15: Cylinder member 15A: Spring receiver 15B: Stopper surface 15C: Seal piston 15D: Cylinder chamber 15E: Guide portion 15F: Scale Display part 15G: Push rod 15H: Slide ring 15I: Groove 15J: Vent hole 15K: Slit 15M: Vent groove 16: Holding spring 17, 24: O-ring 18, 20: Chamber 22: Sleeve 22A: Sleeve body 22B: One part 22C: contact part 22 : Vent 23: piston (piston member) 23C: pressure indicator section 26: return spring 27: Disk 27A: guide portion 27B: Cylinder received 27C: retainer groove 27D: vent hole 28: Packing 28A: through-hole

Claims (2)

[Claims] 1. A tire pressure measuring instrument for detachably mounted on a base of a tire valve to measure air pressure in a tire, wherein the body is detachably mounted on the base of the tire valve, and is fixed to the body. A lower cover, an upper cover movably provided on the inner periphery of the lower cover, a spring installed with an initial load between the upper cover and the body, and an axial movement integrally with the upper cover. A cylinder member integrally provided with a push rod for pressing the spindle shaft of the tire valve to open the tire valve to introduce air pressure by doing, and the air pressure housed in the cylinder member and introduced from the cylinder member A moving piston member, a spring that biases the piston member with an initial load applied thereto and changes its displacement depending on the magnitude of air pressure; A display portion provided on an outer periphery of the cylinder member to display a movement amount of the piston member; a guide hole formed in the body to guide and house a base of the tire valve; A tire pressure measuring meter, wherein a packing member having a through hole through which the push rod projects when the upper cover is moved is provided. 2. The tire air pressure meter according to claim 1, wherein an ear portion protruding in a direction perpendicular to an axis is provided at a tip portion of the body, and a mounting hole is formed in the ear portion. Tire pressure meter.