JPS582943Y2 - Gas cutting blowpipe cutting oxygen valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting oxygen valve for a gas cutting blowpipe.

Conventionally, there are two types of cutting oxygen valves for gas cutting blowpipe: the so-called valve type, which is opened and closed by turning the handle, and the lever set, which opens and closes the valve body with a lever. Although it has the advantage of gradually releasing cutting oxygen and allowing cutting to start smoothly, it generally requires the handle to be operated with the thumb, index finger, and middle finger, so one hand is used to cut the blowpipe. Since one hand is normally held away from the blowpipe when operating the handle, the blowpipe cannot be held reliably stationary and is likely to shake.

Particularly when cutting a thick plate, it is difficult to start cutting unless the tip is securely held at the cutting starting point, which requires considerable skill.

Furthermore, since cutting must be started using both the left and right hands, it is inconvenient that even when cutting a thin plate, it is not possible to start cutting with one hand.

The lever force of the latter allows you to start cutting by pushing the lever while holding the cutter pipe, so when cutting a thin plate with a pressure that does not cause a large reaction due to the release of cutting oxygen, it is possible to cut a thin plate without causing the blowpipe to precipitate. You can start cutting smoothly and can even cut with one hand.

However, in cases where high oxygen pressure is required, such as when cutting thick plates, the movement stroke of the fingertip of the lever to the depressing position is generally small, and it is not possible to adjust the speed of depressing the lever in the middle of the stroke. Since the sealing surface of the valve body is generally flat, the cutting oxygen is rapidly released, and the instantaneous reaction from this release causes the head of the blowpipe with the blowpipe attached to fly upwards, and if the blowpipe is not held too tightly, the blowpipe will explode. This results in the position being shifted from the cutting starting point, and the slag generated during residual heat is blown away, making it impossible to start cutting.

The present invention eliminates the drawbacks of the conventional cutting oxygen valve for blowpipe, and can be opened and closed without removing one hand.Moreover, the present invention can be used when the cutting oxygen pressure is high, such as when cutting thick materials, and there is a sudden reaction due to the release of cutting oxygen. It is an object of the present invention to provide a cutting oxygen valve for a blowpipe for gas cutting, which allows good workability at the start of cutting by slowly opening the valve and allowing oxygen to flow gradually.

Embodiments of the present invention will be described below based on the drawings.

Although FIG. 1 shows an embodiment of the disconnection oxygen valve of the present invention, a conventional example will first be described using this diagram.

In the figure, 1.2 is a hose joint for introducing oxygen and combustible gas, respectively.

The combustible gas is introduced through the hose joint 2, and the hose joint base 3
is led to a combustible gas conduit (not shown) disposed inside the tunnel 12 through a valve (not shown) attached to the
Next, a conduit 1 consisting of three pipes for cutting oxygen, heating oxygen, and combustible gas is passed through the hole drilled in the distribution fitting 17.
The combustible gas is guided through the combustible gas conduit No. 8 to the torch head for attaching the nozzle.

On the other hand, oxygen introduced from the oxygen hose joint 1 is divided into one for heating and one for cutting.

Heating oxygen, like combustible gas, is led to a conduit (not shown) installed in the tunnel 12 through a pulp (not shown) provided in the hose joint stand 3, and then to a hole in the distribution joint fitting 17. through which it is directed via a heated oxygen conduit in conduit 18 to the torch head for mounting on the burner.

(None of these parts are directly related to the present invention, so they are not shown for the sake of simplification.

) The cutting oxygen flows downstream through the valve body 3 and into the chamber 20.
, through a passage 21 into a conduit disposed in the bore pipe 12 and through a hole in the distribution fitting 11 to a cutting oxygen conduit in conduit 18 and finally to the torch head.

A padding material made of rubber or the like is inserted into the valve body 3' to maintain airtightness between the valve body 3' and the valve seat 6, and is constantly pressed against the valve seat 6 by a spring 4 and a stopper 5.

Reference numeral 9 denotes a lever, which is rotated about the bottle 10 as a fulcrum to push up the valve body 3' via the valve push rod T and open the valve.

The valve push rod T is kept airtight by a t op ring 8 or the like.

The above is the basic structure around the valve of a so-called lever set blowpipe, and the lever 9 is the one located below the bore pipe 12 as shown in the figure, the one located above the pipe 12, and the other lever 9 (distributor). The valve body 3' is built into the fitting 17, and the lever 9
There are four types in total, one where the hole is above or below the tunnel 12.

In the present invention, a sliding guide fitting 16 is provided on the outer periphery of the tunnel 12, and a cam 13 and triggers 14, 15 are attached to this guide fitting 16.

The arm end 11 of the lever 9 is brought into contact with the cam surface 13' of the cam 13.

When you slowly pull the trigger 14 or 15 toward you (to the right in the figure) with the finger of the hand that is currently gripping the tube 12, the cam 13 will move using the groove 12' provided in the tube 12 as a guide. It is pulled to the front.

The inclination of the cam surface 13' allows movement of the fingertip.

This is determined by taking into account the largest possible pulling allowance and the lift required to fully open the cutting oxygen valve body 3', that is, the maximum required movement distance of the arm end 11 of the lever 9.

As a result, the movement distance of the tip of lever 9 is 14.15
It is possible to expand the bowing speed of triggers 14 and 15 with your fingertips, so trigger 1
If 4.15 is pulled slowly, the disconnection oxygen valve body 3' will be slowly opened.

Further, the cam surface 13' is not limited to a flat surface with a slope, but can also be a curved surface in which the movement distance of one end of the lever is small at the beginning of pulling the trigger 14, 15, and gradually increases. It is also possible to select a shape that allows the valve body 3' to be fully opened and self-retained.

In the figure, for example, this is the cam surface 13' parallel to the shaft of the pipe.

According to tests conducted by the present inventors, when the arm end 11 of the lever 9 is at the position of the cam surface 13', the spring 4 has a return action on the lever 9, so that all you have to do is release the triggers 14 and 15. The arm end 11 of the lever 9 automatically slides on the cam surface 13' and returns to the original device, closing the valve body 3'.
It is also possible to install a spring between the distributing joint fitting 17 and the distributing joint fitting 17 for automatic return.

To release the fully open self-holding of the cutting oxygen valve body 3' when the arm end 11 is in contact with the cam surface 13', the east trigger 14,
15 should be pushed back.

In addition, in order to give a needle effect to the open state of the cutting oxygen valve body 3', the end of the valve body 3' may be tapered at an acute angle (as shown in Figure 2a), or If the end of the push rod 7 is formed into an umbrella-like shape that gradually expands, combined with the effect of the cam 13, the effect of slowly opening the valve can be further enhanced.

The guide fitting 16 can be disposed on the inner periphery of the tunnel 12, or can be of any shape other than a pipe as long as it allows the cam 13 to slide along the longitudinal direction of the tunnel 12. It doesn't matter if it's a structure or trigger 1
Only one of 4.15 may be used.

FIG. 3 shows another embodiment in which the same effect as described above is achieved by displacing the cam surface 13' in the axial direction of the tunnel 12 while rotating it.

In this embodiment, when the distribution fitting 17 or the nodule 19, which is screwed into the screw provided on the outer periphery of the bore pipe 12, is rotated with the fingers of the hand holding the bore pipe 12, the cam surface 13' is moved toward the front (in the figure). right) and push down the arm end 11 of the lever 9,
If the valve body 3' is opened and rotated in the opposite direction, the valve body 3' will be closed.

If the pitch dimension of the thread of the handle 19 and the shape and dimensions of the cam surface 13' are selected appropriately, the cutting oxygen valve element can be opened slowly with just the movement of the fingertip, giving exactly the same effect as the valve type. I can do it.

In another embodiment of the present invention, the arm end 11 of the lever 9 may be pushed down by displacing the handle cam surface 13' provided on the outer periphery of the pipe in the circumferential direction.

FIG. 4 shows an example of such a cam.

With conventional lever-type on/off valves, the lever was pressed directly by hand and the valve was opened and closed with a small stroke, making it difficult to slowly open the valve.However, with this invention, the lever does not need to be pressed directly by hand, and the valve opens and closes with a small stroke. The cam is displaced by a long stroke movement, rather than the suppression of back and forth or left and right rotation of the fingers, and the displacement of the cam presses the lever, so the time required to open the valve can be extended, allowing the valve to open slowly. It becomes possible to do so.

As explained above in detail, when the cutting oxygen valve according to the present invention is used in a cutting blowpipe, the blowpipe is cut by operating the trigger or nozzle with the fingers of the hand while gripping the blowpipe. Since the oxygen valve body can be opened slowly and the cutting oxygen can be released gradually, one-handed cutting operation is possible when using a crater with a small cutting capacity, i.e. low oxygen pressure and less recoil due to gas pressure when releasing. This is extremely convenient when only one hand is available, such as when cutting at high places with poor footing.

In addition, when using a tinder that has a large capacity, i.e., cuts thick materials at high pressure, the slag generated by residual heat at the starting point of cutting is not blown away, and the blowpipe can be operated with both hands firmly in place. There is no possibility of shifting the crater position from the cutting starting point due to pressure reaction.
Since cuts can be made smoothly, the effect on workability and cutting results is tremendous.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the disconnection oxygen valve of the present invention, Fig. 2 is an explanatory diagram showing an example of the structure of the disconnection oxygen valve body and valve pusher rod according to the present invention, and Fig. FIG. 4 is a diagram illustrating a modification of the cam according to another embodiment of the present invention. 1, 2...Hose joint, 3...Hose joint stand, 4...Spring, 5...Stopcock, 6...Co-product , 7... Valve pusher rod, 8...
...Piece O" ring, 9...Lever 10...
...Pin, 11...Lever arm end, 12.
...Drill pipe, 13...Cam, 13'...
...Cam surface i, 14. 15...Trigger, 16...Guide fitting,
17... Distribution joint all black 18... Conduit,
19...Nuttle, 3'...Disconnected oxygen valve body, 3...Filling.

Claims (1)

[Scope of utility model registration request] A cutting oxygen valve for a gas cutting blowpipe, which includes a valve body pressed against a valve seat, a valve push rod that pushes up this valve body, a lever that engages with this valve push rod at one end and is pivoted at an intermediate point, and this lever. A cutting oxygen valve for a gas cutting blowpipe, characterized in that it includes a cam that abuts the other end and displaces the lever around the pivot point by displacement thereof, and a 9-karat gold metal that is installed on the outer periphery of the pipe and displaces the cam.