JPS5841470Y2 - tire gauge - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a tire gauge that makes it possible to measure the air intake and exhaust air in the tire tube and the pressure in the tire tube.In particular, it improves the accuracy of the measurement of air intake, exhaust air, and pressure in the tire tube. It was designed so that

Conventionally, as a tire gauge for measuring air supply, exhaust, and pressure of a tire tube, for example, the Utility Model Publication No. 50-33188
The device shown in the following issue has been proposed and put into practical use.

However, such tire gauges are easily damaged because the taper part of the valve body guide rod and the through-hole seat of the operating rod are in direct contact when supplying air to the tire tube. If the cylindricity of the seat and the central axes of the two do not match, a gap will be created on the seat surface, causing air leakage to the operating rod side, making it impossible to supply air accurately, and also causing a problem with the tightness between the operating rod and O-ring. Due to this, the operating rod returns slowly, making it difficult to set the tire tube pressure and making it impossible to accurately measure the tire tube air pressure.

This invention was made to solve the above-mentioned conventional drawbacks, and specific embodiments thereof will be described below with reference to the drawings.

In FIG. 1, the tire gauge main body 1 has a pistol shape, and has a grip part A and an air passage part B connected to the upper part of the grip part A. and air switching valve mechanism 2 that controls each pressure measurement operation.
In addition, a pressure gauge 3 that displays the pressure of the tire tube is attached to the air passage part B, and the tip of the air passage part B is connected to the air opening of the tire tube via a ventilation pipe 4. A matching air injection nozzle 5 is attached, and the ventilation pipe 4 can be attached or detached by a one-touch cover 30.

The air switching valve mechanism 2 has a grip portion A as shown in FIG.
The air switching valve mechanism 2 is fitted into the center of the hole 6, and the air switching valve mechanism 2 is fitted into the center of the hole 6, and the air switching valve mechanism 2 is inserted into the hole 6 into two left and right chambers 6a, The valve guide bushing 7 has valve seats 8 and 9 formed at both opening edges of the valve guide bushing 7, and a backing 10 is provided in the one chamber 6a. A first valve body 11 is provided which abuts the valve seat 8 of the valve guide plusure through the valve body, and the guide rod 12 having the air circulation groove 12a of this valve body 11 can be slid into the guide hole 7a of the valve guide plusure. and insert this valve body 11 into the chamber 6.
The valve seat 8 is pressed against the valve seat 8 by a spring 14 interposed between a sealing cap 13 screwed onto the open end of the valve a.

Further, one end of an air passage 15 formed along the length direction in the grip part A is communicated with the chamber 6a, and the other end is connected to a compressor (not shown) provided on the lower end surface of the grip part A. The air supply port 16 is connected to the air supply port 16.

Inside the other chamber 6b is a shaft portion 18 for opening the first valve body, which is fitted into the guide hole 7a of the valve guide Plusure.
A second valve body 18 having a protruding portion 18a is disposed in alignment with the axis of the first valve body 11, and the shaft portion 18a is provided with a shaft portion 18a that communicates the guide hole 7a of the valve guide Plusure with the chamber 6b. A ventilation hole 19 is formed, and the tip of the shaft portion 18 a that contacts the guide rod 12 of the first valve body 11 is reduced in diameter, and this shaft portion 18 a The second valve body 18 is made to return quickly by not coming into sliding contact with the O-ring 17 provided in the guide hole 7a except when it is inserted into the guide hole 7a of the valve guide bushing 7 until it is operated. Furthermore, a backing 20 is attached to the side end surface of the second valve body 18 facing the valve seat 9 of the valve guide Plusure, which maintains airtightness when the valve body 18 comes into contact with the valve seat 9. On the end surface of the body 18 opposite to the shaft portion 18a, there is a valve operating rod 21 having a plurality of air circulation grooves 21a formed on the outer peripheral surface.
This valve operating rod 21 is made to protrude outward through a sealing cap 22 screwed onto the open end of the chamber 6b, and one end is connected to the air circulation part B of the tire gauge main body 1 at this protruding tip. A rotatably mounted operating lever 23 is brought into contact.

Further, a valve seat 24 provided inside the sealing cap 22
The valve body 1 is connected to the valve body 1 through the backing 25 attached to the valve body 18.
8, and a compression spring 26 interposed between the valve body 18 and the guide plusure causes the valve body 18 to engage with the valve body 18.
is pressed against the valve seat 24 at all times, so that a vent hole 19 provided in the shaft portion 18a of the valve body 18 opens into the chamber 6b.

Reference numeral 27 denotes an air passage formed in the air passage section B. One end of this air passage 27 is communicated with the ventilation pipe 4, and the other end is passed through a guide hole 7b formed in the guide plusure. 7a.

Further, 28 is an air passage formed in the air passage portion B, and one end of this air passage 28 is communicated with the pressure gauge 3, and the other end is communicated with the chamber 6b.

Next, the operation of the tire gauge of this invention constructed as described above will be explained.

When injecting compressed air into the tire tube, first pull the operating lever 23 as much as possible in the direction of the arrow X in FIG. Then, the backing 20 is moved toward the guide plusure and pressed against the valve seat 9 of the guide plusure, thereby sealing the opening of the bushing 7 on the chamber 6b side.

At the same time, the tip of the shaft portion 18a entering the guide hole 7a of the guide Plusure comes into contact with the guide rod 12 and the first
The valve body 11 is moved against the spring 14 in the direction of the arrow in FIG.
is exposed in the chamber 6a.

Therefore, the compressed air supplied from the compressor to the chamber 6a through the air supply port 16 and the air passage 15 is
The air is injected into the tire tube along the route of the air circulation groove 12a, the guide hole 7a, the ventilation hole 7b, the air passage 27, the ventilation pipe 4, and the air injection nozzle 5.

When a predetermined amount of air has been supplied to the tire tube through the above operation, when the force in the direction of the arrow X on the operating lever 23 is released, the second valve body 18 is returned to its original position by the spring 26 and is pressed against the valve seat 24. At the same time, the first valve body 11 is also pressed against the bush 7 by the spring 14.
The valve seat 8 is pressed against the valve seat 8 to seal it.

At this time, compressed air pressure from the compressor also acts on the first valve body 11 to further completely seal the valve seat 8 with the backing 10.

Furthermore, when the second valve body 18 is returned by the spring 26, while the large diameter portion of the shaft portion 18H is in sliding contact with the O-ring 17, the return of the valve body 18 is braked by the frictional resistance between the two. However, when the large diameter portion disengages from the O-ring 17, the valve body 18 is instantly returned without being subjected to the braking force by the O-ring 17, and the operating rod 2
The amount of air in the tire tube that is unnecessarily discharged into the atmosphere from the air circulation groove 21a of No. 1 can be reduced.

At the stage where the first and second valve bodies have been returned to the state shown in FIG.
The compressed air of the tire tube flows back into the chamber 6b through the vent hole 19 of the tire tube, and at the same time flows into the pressure gauge 3 through the air passage 28, so that the pressure gauge 3 displays the air pressure of the tire tube.

Here, if the air pressure in the tire tube is insufficient, the operation lever 23 may be operated as much as possible in the direction of the arrow in FIG. 1 in the same manner as described above.

Further, when the air pressure in the tire tube is excessive, the operating lever 23 rotates slightly in the first arrow X direction to move the second valve body 18 in the arrow X direction, and the operating rod 21 The formed air circulation groove 21a is made to protrude into the chamber 6b to communicate the chamber 6b with the atmosphere (at this time, the shaft portion 18a is
(does not engage ring 17).

Therefore, the compressed air in the tire tube is released into the atmosphere through the chamber 6b.

If the force applied to the operating lever 23 is released at any point in time during this evacuation, the valve body 18 will instantly return to its original position as shown in FIG. The compressed air in the tire tube is applied to the pressure gauge 3, and the air pressure is measured and displayed again.

As described above, according to the tire gauge of this invention, the guide hole 7a of the valve guide plusure divides the inside of the hole 6 into two left and right chambers.
At the stage when the shaft portion 18a of the second valve body inserted into the second valve body comes into contact with the guide rod 12 of the first valve body and the ventilation hole 19 is closed, the O-ring 17 provided in the guide hole 7a slides. When the first valve body 11 is opened by the shaft portion 18a, the second valve body 18 is brought into pressure contact with the valve seat 9 provided on the chamber 6b side of the guide bushing 7 via the backing 20. Therefore, when air is being supplied to the tire tube, the compressed air in the chamber 6a does not leak to the chamber 6b, making stable air supply possible, and the compressed air is inserted into the guide hole 7a of the guide plusure. The fitting end of the shaft portion 18a of the second valve body 18 is connected to the guide hole 7.
The valve body 1 is configured so that it does not come into contact with the O-ring 17 in the chamber 6b at all from the time when the tire tube communicates with the chamber 6b.
8 is returned to its original position, the shaft part 1 is held by the O-ring 17.
8a, there is no braking force on the valve body 18a.
is instantly returned to its original position, which dramatically reduces unnecessary exhaust from the tire tube due to the delay in the return of the valve body 18, which simplifies tire tube exhaust adjustment, and improves tire tube air pressure. It also has the effect of allowing accurate measurements.

[Brief explanation of the drawing]

Figure 1 is a side view of the tire gauge according to this invention, Figure 2 is a side view of the tire gauge according to this invention.
The figure is an enlarged sectional view of the air switching valve mechanism in this invention. 1... Tire gauge body, 2... Air switching valve mechanism, 3... Pressure gauge, 4... Ventilation pipe, 6... Hole, 6 a, 6 b...
...Chamber, 7...Valve guide bushing, 7a...
...Guide hole, 8.9...Valve seat, 10...
...Backing, 11...First valve body, 12
...Guide rod, 12a... Distribution groove,
14...Spring, 15...Air passage, 17...O, ring, -18...
Second valve body, 18a...Shaft portion, 19...
...Vent hole, 20...Backing, 21...
... Valve operating rod, 21a... Distribution groove, 23
......Operation lever, 24...Valve seat, 25
...Backing, 26...Spring, 27.28...Air passage, A...Gripping part, B...Air passage part .

Claims (1)

[Scope of utility model registration request] The inside of the hole 6 formed in the grip part A of the tire gauge main body 1 is divided into two chambers 6a and 6b by a valve guide plusure which has valve seats 8 and 9 on the opening edges of both ends fitted into the hole 6, and one of the two chambers 6a and 6b. A first valve body 11 that is constantly pressed by a spring 14 is provided on one valve seat 8 of the valve guide plusure in the chamber 6a communicating with the compressor, and a flow passage protruding from the first valve body 11 is provided. Guide rod 12 with groove 12 a
is slidably fitted into the guide hole 7a of the valve guide bushing 7, so that compressed air from the compressor can be supplied to the tire tube through the first valve body 11 and the valve guide bush 7, and the pressure can be reduced. In the other chamber 6b communicating with the valve guide bushing 7, a spring 2 is attached to a compressed air exhaust side valve seat 24 installed on the opposite side of the valve guide bushing 7.
A second valve body 18 is provided which is constantly pressed by the valve 6, and the first valve body 11 is fitted into the guide hole 7a of the valve guide bushing 7 on one end surface of the second valve body 18. A shaft portion 18a having a ventilation hole 19 connected to the other chamber 6b to be opened is provided in a protruding manner, and the diameter of the end portion of the shaft portion 18a on the side that comes into contact with the guide rod 12 is reduced in diameter. Until the valve body 11 is operated to open, the second valve body is prevented from coming into sliding contact with the O-ring provided in the guide hole 7a except when it enters the guide hole 7a of the valve guide Plusure, and one end surface of the second valve body is provided with a backing 20 that seals the other valve seat 9 of the valve guide bushing when the first valve body 11 is opened, and further has a backing 20 on the other end surface of the second valve body for discharging the compressed air. An operating rod 21 is provided that protrudes outward through the side valve seat 24, and by operating the operating lever 23, which is attached to the tire gauge body, the air supply, exhaust, and air pressure of the tire tube can be measured step by step. A tire gauge characterized by the following: