JPH11336997A - Drain cock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the unexpected opening of a valve and ensure the sound action of a brake device and the like by elastically pushing/pressing an operating ring to an upper rotational position abutted to a drain cock main body. SOLUTION: In the case that water collected in the inside of an air tank 12 is removed, an operating ring 44 located in an upper rotational position or a suspending position is pulled in a transverse direction by fingers or an operating tool. Hereby, a valve member 32 is inclined, and together with a part of compressed air in the inside of the air tank 12, water collected in the bottom part of the tank 12 is removed from a drain delivering path 40 to the outside. At this time, the energization force of a coil spring 48 pushing/pressing the operating ring 44 to the upper rotational position is enough weak, therefore an occupant on a vehicle can easily perform draining work. Even though a foreign matter such as mud and snow is jumped up, the operating ring 44 is retained in the upper position by the coil spring 48, therefore the foreign matter is generally stuck to the outer part of the operating ring 44 and the like. Therefore, when the vehicle is suddenly started or suddenly braked, inertia force to incline a valve member may not be applied to a valve shaft 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain cock device suitable for an air tank for storing compressed air mounted on a vehicle such as a truck.

[0002]

2. Description of the Related Art When moisture is supplied together with compressed air to a brake device of a vehicle using compressed air as a working medium, rust is likely to be generated in the air piping and various parts of a compressed air responsive device of the brake device, and it is also difficult to cool down. Since there is a possibility that the operation of the brake device may become uncertain due to freezing, it is necessary to appropriately discharge the water accumulated in the tank from the bottom of the air tank for storing the compressed air.

[0003] The structure of a conventional drain cock provided for discharging water collected at the bottom of the air tank will be described with reference to Figs. First, in the front view of FIG. 3, reference numeral 10 denotes a bottom wall of the air tank 12 showing only a part thereof, 14 denotes a weld nut provided in a water collecting recess of the bottom wall 10, and 16 denotes a drain cock body. is there.

The drain cock main body 16 has a male screw portion 18 screwed to the weld nut 14 at its upper end.
And a main body 24 having a nut portion 20 formed on the outer periphery and a valve chamber 22 formed therein. The valve chamber 22 is provided through an inlet passage 18 ′ coaxially provided in the male screw portion 18. To communicate with the inside of the air tank 12. The nut portion 20 is formed by connecting the male screw portion 18 to the weld nut 1.
4 is provided to apply a wrench or another tool when screwed into the screw 4.

As shown in the enlarged sectional view of FIG. 4, an annular rubber sheet 26 is held at the bottom of the valve chamber 22 by a retainer ring 28 and a caulking portion 30. Is configured such that a large-diameter disk portion 34 of the valve member 32 is pressed by a valve spring 36 to form an airtight joint. An annular drain discharge path 40 is formed between the valve shaft 38 extending below the valve member 32 and the center hole of the rubber sheet 26. A small hole 42 is formed in the lower end portion of the valve shaft 38 in the diameter direction, and an operation ring 44 is inserted through the small hole 42 and suspended.

In the above conventional drain cock device,
Normally, the urging force of the valve spring 36 causes the valve member 32
The disk portion 34 abuts against the rubber sheet 26 and the compressed air pressure in the air tank 12 also acts in the valve closing direction, so that the disk portion 34 comes into close contact with the rubber sheet 26 to form an airtight joint, and the drain discharge path is formed. Reference numeral 40 is closed so that the compressed air in the air tank 12 does not leak outside.

Next, when the water in the air tank 12 is to be removed, the operation ring 44 is pulled in the lateral direction with respect to the axis of the valve member 32 to incline the valve member 32, and a part of the disk portion 34 is removed. Since a gap is formed between the rubber sheet 26 and the compressed air in the air tank 12, the water collected at the tank bottom is ejected to the outside from the drain discharge path 40 and is eliminated.

However, the vehicle travels on muddy ground,
Alternatively, when the vehicle runs on a snowy road in cold weather, as shown in FIG. 5, a large amount of real material 46 such as mud or ice and snow adheres to the periphery of the operation ring 44 and the weight increases, so that the vehicle suddenly starts or brakes suddenly. At times, the valve member 32 tilts due to inertia, the drain discharge passage 40 opens, the compressed air in the air tank 12 is discharged to the outside, the compressed air pressure in the tank decreases, and the operation of the brake device is uncertain. There was a fear.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is directed to an operation ring mounted on a valve shaft of a valve member of a drain cock device provided at the bottom of an air tank for storing compressed air. In the event of sudden start or sudden braking, the valve member tilts due to the inertia of the adhered material and unexpectedly opens the valve. It is an object of the present invention to provide an extremely simple and inexpensive drain cock device capable of reliably preventing the pressure of compressed air from being reduced and causing the operation of the brake device to be uncertain.

[0010]

In order to achieve the above object, the present invention provides a drain cock body mounted on the bottom of an air tank and having a drain discharge passage therein, and the drain cock body supported by the drain cock body. A valve member for opening and closing the discharge passage, an operation ring pivotally supported by a valve shaft protruding outside the drain cock body of the valve member, and the operation ring fitted externally to a lower end of the valve shaft and connecting the drain cock body And a drain cock device provided with a spring member that elastically presses the upper rotation position in contact with the drain cock.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be specifically described below with reference to a front view of FIG. 1 and a side view of FIG. (Note that the same reference numerals are used for members and portions that are substantially the same as or correspond to the conventional drain cock device described with reference to FIGS. 3 to 5.)
The male screw 18 is screwed into a weld nut 14 fixed to the bottom wall 10 of the second tank 2 to form a drain cock main body 16 mounted on the bottom of the air tank 12, a valve member 32 housed in the drain cock main body 16, and the like. Is substantially the same as the conventional drain cock device.

In the present invention, a coil spring 48 (spring member) is externally fitted to the lower end of a valve shaft 38 projecting downward from the drain cock body 16 of the valve member 32. While being in contact with the operation ring 44 inserted through the small hole 42 of the valve shaft 38,
The lower end is contracted and abutted on a split pin 50 acting as a spring retainer.

Accordingly, the operation ring 44 is always elastically urged upward by the compression reaction force of the coil spring 48, and the upper end of the operation ring 44 is placed on the outer peripheral surface of the drain cock body 16 as shown in the figure. It is elastically locked at a contact position, that is, any one of a right upper pivot position shown by a solid line in FIG. 2 and a left upper pivot position shown by a two-dot chain line.

When the water accumulated in the air tank 12 is to be removed, an arbitrary portion on the circumference of the operation ring 44 at the above-described upper rotation position or the rest position, usually, the left or right circumference portion in FIG. When the vehicle occupant puts his / her finger or hooks an appropriate hook-shaped operating tool and pulls the operating ring 44 in the lateral direction, the valve member 32 is tilted, and the air tank is moved in the same manner as in the conventional drain cock device. The water collected at the bottom of the tank together with a part of the compressed air inside 12 is discharged to the outside from the drain discharge passage 40. At this time, since the urging force of the coil spring 48 pressing the operation ring 44 to the upper rotation position is sufficiently small, the required operation force for pulling the operation ring 44 in the lateral direction is small, and the vehicle occupant needs The above-mentioned drainage operation can be easily performed.

Next, when the vehicle travels on muddy ground or on a snowy road, foreign substances such as mud and snow are splashed up and adhere to the drain cock device. 48, the drain cock body 16 and the valve shaft 3
8 and the operation ring 44 and the like, and a large inertial force that tilts the valve member 82 does not act on the valve shaft 38 when the vehicle suddenly starts or suddenly brakes. Of the air tank 12 based on the tilt of the valve member 32
There is no problem that the compressed air inside is discharged. Needless to say, the same effect can be obtained even if the coil spring in the above-described embodiment is appropriately changed to a disc spring, a leaf spring, or the like.

According to the above configuration, as described above, an extremely simple structure in which a small, lightweight and inexpensive coil spring 48 is contracted at the lower end portion of the valve shaft 36 of the valve member 32 in the conventional drain cock device is used. It is possible to prevent accidental discharge of compressed air from the air tank 12, and therefore, there is an advantage that sound operation of a brake device and other vehicle-mounted air pressure responsive devices using compressed air as a working medium can be ensured.

[0017]

As described above, the drain cock device according to the present invention is mounted on the bottom of an air tank and has a drain discharge passage therein, and the drain cock body supported by the drain cock body. A valve member for opening and closing the discharge passage, an operation ring pivotally supported by a valve shaft protruding outside the drain cock body of the valve member, and the operation ring fitted externally to a lower end of the valve shaft and connecting the drain cock body It is equipped with a spring member that elastically presses to the upper rotation position where it comes into contact with the cylinder. The structure is extremely simple and inexpensive, and prevents accidental opening due to adhesion of mud, ice and snow, etc. There is an advantage that sound operation of a brake device or the like using air as a working medium can be ensured.

[Brief description of the drawings]

FIG. 1 is a front view of a drain cock device showing a preferred embodiment of the present invention.

FIG. 2 is a side view of the drain cock device shown in FIG.

FIG. 3 is a front view showing a conventional drain cock device.

FIG. 4 is an enlarged partial sectional view showing an internal structure of the drain cock device shown in FIG. 3;

5 shows mud in the drain cock device shown in FIG. 3,
It is the front view which showed the adhesion state of foreign substances, such as ice and snow.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Bottom wall of air tank, 12 ... Air tank, 16 ... Drain cock main body, 18 ... Male screw part, 22 ... Valve chamber, 26
... Rubber seat, 32 ... Valve member, 34 ... Disc part, 36 ...
Valve spring, 38: valve shaft, 40: drain discharge path, 4
2 ... small hole, 44 ... operation ring, 46 ... foreign matter, 48 ... coil spring, 50 ... split pin (spring retainer).

Claims (1)

[Claims] 1. A drain cock body mounted on a bottom of an air tank and having a drain discharge passage therein, a valve member supported by the drain cock body to open and close the drain discharge passage, and the drain cock of the valve member An operating ring pivotally supported by a valve shaft protruding out of the main body, and a spring member which is fitted to a lower end of the valve shaft and elastically presses the operating ring to an upper rotation position in contact with the drain cock main body. A drain cock device comprising: