RU11149U1 - PNEUMATIC TIRE VALVE EXTENSION (OPTIONS) - Google Patents

Description

Pneumatic tire veitile extension (options)

The use relates to transport equipment, namely to extension valves for pneumatic tires, designed to improve the convenience of servicing tires of vehicles with dual wheels. At the same time, great difficulties arise with measuring the pressure and inflating the tires of the inner wheels due to the inconvenient and remote location of their valve from the operator.

Known recommendations for using for these purposes are valve extensions screwed onto the tire valves of the inner wheels (see the book Automotive Tractors. Handbook, under the general editorship of IV Balabin. M., Mechanical Engineering, 1985, p. 143, Fig. 3.17). However, when applying them, there are problems associated with the need to provide the ability to measure air pressure in the tire, for which it is necessary to press the head of the spool rod so that air from the tire cavity can enter the measuring device (manometer).

A known valve extension of a pneumatic tire valve containing a tubular body, and a pusher located inside it for interaction with a tire spool (US Pat. Germany No. 803804, class 63 e 31/01, 1951). The specified device when screwing it on the valve of the inner wheel pushes with its pusher on the spool rod and leaves it in a constantly open position, thus depressurizing the tire cavity. In order to prevent air from escaping from the tire, a second spool is provided at the second end of the known extension, which seals the extension cavity, which is constantly connected to the tire cavity.

The disadvantages of the known device are its structural complexity (requires two spools on one tire) and unreliability in

IPC: B 60 S 29/06

work, because depressurization most often occurs between the two spools mentioned.

As a prototype of the extension options, an extension of a pneumatic tire valve is adopted, comprising a tubular body made with at least one stepwise narrowing of the inner hole from the end facing the valve, to the outlet, and a pusher located inside the housing for interacting with the tire spool, having a limiter of its axial mixing, interacting, and the aforementioned narrowing (see certificate of the Russian Federation for utility model No. 8309, class B 60 C of 29/06, 1998).

The disadvantages of the known extension cord are the low reliability of the axial mixing limiter; the pusher inside the case due to the possibility of crushing the surfaces of the limiter and its embedment in the case, as well as the inconvenience of using it, especially in winter. The latter is due to the fact that in winter, after inflation of the tire or measurement of air pressure in it, sticking or freezing of the spool rod of the tire often occurs, due to which the spool valve remains in the open position, and the spool valve does not have enough force to overcome this freezing and close the spool valve. As a result, air is drained from the tire, and to eliminate it, you have to unscrew the extension cord and, using any means at hand, try to return the spool rod to its original position, which is extremely inconvenient due to the difficult access to the tire valve of the inner wheels.

The main problem to be solved is the creation of a reliable, technologically advanced and easy-to-use design of a valve extension devoid of these drawbacks.

made with at least one step-wise narrowing of the inner hole from the end facing the valve, to the outlet, and a pusher located inside the housing for interacting with the tire spool, having an axial displacement limiter interacting with said narrowing, the axial displacement limiter is provided with two diametrically opposed rectangular slots, the outer diameter of which exceeds the diameter of the outlet of the housing. This design allows for the simplest technological implementation plan to ensure reliable operation of the axial displacement of the pusher, eliminating the possibility of pinching it in the housing.

It is most advisable if the mentioned slots are made in the area of the pusher having a triangular cross section, the described diameter of which coincides with the outer diameter of the slots. This achieves the most simple from the point of view of manufacturing technology and structurally the most rigid and reliable performance of the pusher rod.

Preferably, the pusher portion located inside the outlet of the housing has a triangular cross section with cut corners, the described diameter of which is smaller than the diameter of the outlet of the housing, and the faces are a continuation of the faces of the pusher in the portion of its axial displacement limiter. This increases the manufacturability of the pusher and the extension cord assembly.

According to another embodiment, for a valve extension of a pneumatic tire containing a tubular body having an end face facing the valve and a pusher located inside the housing for interacting with the tire spool, the body is provided with a lateral protrusion ending in a head protruding beyond the end face of the valve.

Due to the presence of the said protrusion, the conditions for using the extension cord in operation are improved, since sticking of the tire spool can be eliminated by simply pressing the head of the spool rod with the protrusion of the extension cord screwed from the valve.

The predominantly mentioned head is made in the form of a hemisphere, which facilitates the use of the extension cord and protects the spool shaft from breaking if the pressure is applied too hard.

Sush; the essence of the proposed technical solution is illustrated by drawings, which depict:

in FIG. 1 - general view; sectional view of an extension extending onto a tire valve;

in FIG. 2 - extension pusher;

in FIG. 3 is a cross section AA of the pusher of FIG. 2;

in FIG. 4 is a transverse section BB of the pusher of FIG. 2;

in FIG. 5 is a sectional view of a portion of an extension portion screwed onto a valve;

in FIG. 6 is a view B of the extension end of FIG. 5.

Extension with tubular body 1 thread 2 screwed onto the valve

3 pneumatic tires. Case 1 is made with stepped narrowings

4 and 5 of the inner hole. The sleeve 6 is pressed into the housing 1 in the place of the first restriction 4, the axial mixing stop 7; the pusher 8 is located in the gap between the constrictions 4 and 5, and the spring 9 is installed between the sleeve 6 and the stop 7. The end of the pusher 10 protrudes from the outlet 11 outward beyond the end 12 of the housing 1 and is used to press it when measuring the air pressure in the tire (when bleeding or inflating the tire) while the pusher 8 presses the head 13 of the shaft of the valve 14 and communicating the inner cavity of the tire with the extension cavity. The housing 1, the sleeve 6 and the pusher 8 can be made of a polymeric material, such as polypropylene. To increase rigidity and give the pusher 8

of the most technologically advanced form, the limiter 7 is equipped with two diametrically opposite opposite rectangular slots 15 and 16, the outer diameter D of which exceeds the diameter of the outlet opening 11 of the housing. The slots 15 and 16 are made in the area of the pusher 8, having a triangular cross section, the described diameter of which coincides with the outer diameter D of the splines (Fig. 3). The pusher section 8 located inside the outlet AND of the housing has a triangular cross section with cut corners (see Fig. 4), the described diameter d of which is smaller than the diameter of the outlet of the housing, and the faces 17, 18 and 19 are a continuation of the faces of the pusher 8 in the section limiter 7.

According to another embodiment, the housing 1 is provided with a lateral protrusion 20, ending; having a head 21, protruding; to it beyond the end facing the valve 3 of the end 22 (Figs. 5 and 6). It is most advisable if the head 21 is made in the form of a hemisphere.

The extension cord is assembled in the following sequence: in the tubular body 1 from the side of the internal thread 2, the pusher 8 is inserted until the stop of its limiter 7 with slots 15 and 16 into the restriction 5. The spring 9 and the sleeve 6 are put on the pusher, which are pressed into the restriction 4 until they stop The extension cord is assembled and ready to go.

The device operates as follows: after screwing the housing 1 by thread 2 onto the valve 3 of the pneumatic tire until the valve stops in the polymer sleeve 6, the pusher 8 does not touch the head 13 of the spool rod 14, because this is prevented by the spring 9, which pushes the pusher 8 until the stopper 7 rests with its slots 15 and 16 to narrow 5. However, when the extension cord is screwed onto the tire cavity depressurization valve, it does not occur, and even damage to the extension cord by foreign objects caught between the twin wheels cannot lead to air outlet from the tire and loss of its performance. To measure air pressure or inflate tires

the tip of the pressure gauge or pumping device presses the end face 10 of the pusher 8, which reports the movement of the head 13 of the spool rod 14, causing the valve to open. Slots 15 and 16 prevent the inertial pulling of the pusher 8 into the constriction 5 of the inner hole of the extension tubular body 1 under the action of the total force of the spool spring, pusher spring 9 and the air leaving the tire when removing the pressing force from the end face 10 of the pusher, and thus increase the reliability of operation extender, ensuring the exclusion of sticking of the pusher 8 in the hole of the housing 1 and the constant ease of its movement.

In winter, due to the freezing of the condensate of moisture always present in the pumped air, sticking or freezing of the spool pin 14 of the valve 3 of the pneumatic tire is possible, due to which air continues to escape from the tire even after depressing the pressing force from the end face 10 of the pusher. In this case, it is enough to simply unscrew the extension casing and use the protrusion 20 with the spherical head 21, as a rule, blindly poke it in the valve 3. The spherical shape of the head 21, providing self-alignment, will bring the head 21 into contact with the head 13 of the spool rod 14 and destroying the formed ice crust will cause closing the spool. After that, the extension cord is screwed onto valve 3 again, and the device is ready for further operation.

The proposed device, eliminating the possibility of sticking during operation of the extension and spool elements, provides increased reliability and ease of use and is technologically advanced in manufacturing.

Claims (5)

1. An extension of a pneumatic tire valve comprising a tubular body made with at least one stepwise narrowing of the inner hole from the end facing the valve and an outlet, and a pusher located inside the housing for interacting with the tire spool having an axial movement limiter interacting with said narrowing, characterized in that the axial displacement of the pusher is provided with two diametrically oppositely located rectangular slots, the outer the diameter of which exceeds the diameter of the outlet of the housing.  2. The extension cord according to claim 1, characterized in that the said slots are made in the area of the pusher having a triangular cross section, the described diameter of which coincides with the outer diameter of the splines.  3. The extension cord according to claim 2, characterized in that the portion of the pusher located inside the outlet of the housing has a triangular cross section with cut corners, the described diameter of which is smaller than the diameter of the outlet of the housing, and the faces are an extension of the faces of the pusher in the area of the limiter of its axial movement .  4. An extension of a pneumatic tire valve comprising a tubular housing having an end face facing the valve and a pusher located inside the housing for interacting with the tire spool, characterized in that the housing is provided with a lateral protrusion ending with a head protruding beyond the end face of the valve. 5. The extension cord according to claim 4, characterized in that the said head is made in the form of a hemisphere.