JPH0512590Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a blowpipe that is applied to gas cutting blowpipe, gas welding blowpipe, heating blowpipe, etc., and in particular has a fuel gas passage and an oxygen passage in the handle part. Regarding blowpipe.

``Prior Art'' Conventionally, various regulating valves 4, 5, and 6 have been provided for supplying oxygen and fuel gas to the head 3 through an oxygen pipe 1 and a preheating pipe 2, as shown in FIG. 1, for example. A so-called gas cutting blowpipe with a grip part is well known, in which a fuel gas passage 10 and an oxygen passage 11 are provided to communicate between the gas adjustment part 7 and the attachment ports 8 and 9, and a grip part is formed around the fuel gas passage 10 and the oxygen passage 11. In addition, 12 in the figure is the preheating tube 2.
This is a mixing tube that mixes the fuel gas and preheated oxygen introduced into the tank.

In this type of gas cutting blowpipe, first, the fuel gas valve 4 provided in the gas adjustment section 7 is opened to ignite, and then the preheating oxygen valve 5 is opened and its opening degree is adjusted to form a predetermined preheating flame. The preheating flame is applied to the workpiece to heat it, and then the cutting oxygen valve 6 is opened to blow out cutting oxygen, and the iron oxide on the workpiece is blown away by the cutting oxygen flow, thereby performing the prescribed cutting. After the cutting process of the workpiece is completed, the various valves are closed in the reverse order of the cutting oxygen valve 6, the preheating oxygen valve 5, and the fuel gas valve 4, and this is repeated every time the cutting operation is restarted. .

``Problem that the invention seeks to solve'' However, opening and adjusting the opening of the various valves at different times every time the cutting process of the workpiece is restarted or finished will only complicate the cutting process. However, it requires considerable skill to accurately adjust the opening in order to form a good preheating flame.

For this reason, it is also possible to install a lock or other on-off valve at each of the hose attachment ports 8 and 9 on the inlet side of the grip, but if such a configuration is adopted, it is possible to operate the grip at both ends of the grip, and with one hand. The valve must be operated with the other hand while holding the valve, making work even more complicated.

In order to eliminate this drawback, on-off valves are provided in the fuel gas passage 10 and oxygen passage 11 located upstream of the gas adjustment section 7, and the on-off valves are opened and closed by a lever member or the like provided in the handle. A technique for configuring the lever to be controllable is conceivable, but in order to enable one-handed operation, the lever member must be built so as to be rotatable in the direction of the gripping hand, which is cumbersome.

Similarly, in order to enable one-handed operation, the operating part of the lever member, etc. must be exposed to the outside, and for this purpose, it must be assembled in a split-shaped grip part that covers almost the front of the main body. However, incorporating a spring member, a lever member having a support shaft, a reset pin, etc. into the split-shaped grip portion also makes the assembly work extremely complicated.

In view of the shortcomings of the prior art, the present invention provides a grip part that facilitates assembly work and allows one-handed operation to open and close the fuel gas passages and oxygen passages communicating with the various regulating valves at different times. The purpose is to provide a blowpipe with a blowpipe.

"Means for Solving the Problems" In view of the drawbacks of the prior art, the present invention provides hose attachment ports 8 and 9 disposed above and below, and a pair of on-off valves 40 connected to the hose attachment ports.
40', the fuel gas and oxygen supplied from the respective mounting ports 8, 9 are connected to the respective regulating valves 4, 6.
The main body A is integrally molded with a pair of passages 10, 11 leading to the gas, and a gas regulating section 7 equipped with at least the regulating valves 4, 6. The pair of passages 1 are located on both sides of the wall 14.
0 and 11 are juxtaposed, and the pair of passages 10 and 11
The opening space 17 is formed at the center of the main body A on the front side of the vertical wall 14, which is sandwiched between The valve heads 45 of the on-off valves 40, 40', which are configured to be openable, protrude from the vertical wall 14 toward the opening space 17; A lever member 20 is pivotally supported at a predetermined position so as to be able to push the pair of valve heads 45 through the lever member 20, and a reset pin 30 is disposed so as to be able to engage with a recess 21 provided at a predetermined location of the lever member 20. The swinging operation of the lever member 20 opens each on-off valve 4 via the link member 50 and the valve head 45.
0 and 40' are opened, the reset pin 30 engages with the recess 21 of the lever member 20 in the open position, and the reset pin 30 is pushed out of the recess 21 of the lever member 20 by pressing the reset pin 30.
Preferably, the operating portions of the lever member 20 and the reset pin 30 cover at least a portion of the main body A and constitute a grip member B.
We propose a blowpipe whose essential component is that it is directly exposed to the outside without being hidden by the outside.

"Function" According to this technical means, the direction in which the lever member 20 is swung and the direction in which the on-off valves 40, 40' are arranged in parallel are both located on a vertical plane, which will be explained in detail in the examples below. The on-off valves 40, 40'
It is possible to easily control opening and closing with a time difference of .

Furthermore, when the lever member 20 and the reset pin 30 are assembled into a two-split grip member, for example,
Since it is configured so that it can be installed in the main body in which the passages and the like are integrally molded, especially in the opening space sandwiched between the passages 10 and 11, for example, the passages 10,
It is also easy to pivotally support the lever member 20 using both sides extending downward from the lever member 11, and to clamp the reset pin 30 with an elastic force applied thereto, thereby facilitating the assembly work. I can figure it out.

Furthermore, since the operating parts of the lever member 20 and the reset pin 30 are directly attached to the main body A, it is possible to assemble the grip member B, which covers the handle and constitutes the grip, to the main body side independently of these members. This not only expands the versatility of the design, but also allows the main body to function as part of the grip, which leads to a reduction in the number of parts.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are as follows, unless otherwise specified.
This is not intended to limit the scope of this invention, but is merely an illustrative example.

1 to 6 show a blowpipe according to an embodiment of the present invention, and in particular, the structure of the main body portion, which is the gist of the present invention, will be explained in detail.

The main body A has hose attachment ports 8, 9 for attaching a fuel gas pipe and an oxygen gas pipe, and the various regulating valves 4, 5,
6, and a fuel gas passage 10 and an oxygen passage 11 that communicate with each other.These are integrally formed by forging casting or other means, and predetermined parts are cut or screwed. It will be given.
The upper half of the main body A is covered with a grip member B having a substantially semicircular cross section, so that the main body A smoothly functions as a grip. Further, a preheating tube 2 is extended on the forward side of the gas adjustment section 7 via an oxygen tube 1 and a mixing tube 12, and a head 3 for attaching a nozzle is provided at the gathering position of the preheating tube 2.

The hose attachment ports 8 and 9 are formed vertically in parallel, and a coupling 13 is screwed onto the tip thereof.
Opening/closing valves 40, 40' are installed on the back side thereof, and the vertical wall 14 is the part facing the opening space on the front side. The on-off valves 40 and 40' include a valve body 43 that closes a valve seat 42 by a spring 41, and a valve body 43 that is connected to the valve body 43 and has its tip connected to a vertical wall 14 through a guide hole 44.
A tip portion 52 of a link member 50 that projects upward and will be described later.
a, 52b, and by pressing the valve head 45, the space between the valve body 43 and the valve seat 42 is opened against the force of the spring 41, and a guide hole 44 is bored on the side. Hose attachment port 8,
9 and each passage 10, 11 will communicate with each other.

The fuel gas passage 10 and the oxygen passage 11 are arranged parallel to each other in a straight line from approximately the center of the vertical wall of the hose attachment ports 8 and 9 to the gas adjustment part 7, and both passages 10 are located on the side of the vertical wall 14. , 11, a pair of rectangular banks 15, 16 are suspended below the passages 10, 11 and both banks 15, 16, and a rectangular opening space 1 opens vertically in an area sandwiched between the passages 10, 11 and both banks 15, 16.
7, and a link member 5 is placed in the opening space 17.
Lever member 20 and reset pin 30 that pivotally supported 0
Install.

The lever member 20 has a substantially parallelogram shape, and is rotatably supported by a shaft 27 at a position below the banks 15 and 16 on the side adjacent to the vertical wall 14, and has a substantially figure-eight shape extending vertically above the lever member 27. The link member 50 is pivotally supported 22 so as to be swingable.

The link member 50 is pivotally supported by the lever member 20.
The top portion 51 is bifurcated vertically, and its tip portions 52a, 52b are connected to the respective open/close valves 40, 4.
0' to the protruding position of the valve head 45,
An on-off valve 40 located at each tip 52a, 52b of the link member 50 branched from the pivot point 22,
The stroke amounts L1 and L2 up to the 40' pressing position are set to be different, and the fuel gas on-off valve 40 with the smaller stroke amount L1 is formed so that it can be opened by pressure first.

On the other hand, the front end surface side of the lever member 20 has a gently curved shape, and a semicircular engagement recess 21 is provided on one side of the lever member 20, and a reset pin 3 described later is formed.
It is configured to be able to engage with the engagement step portions 33 and 34 of 0.

As shown in FIG. 3, the reset pin 30 includes a bush 36 having a guide hole 36a and a coil spring 3.
7, and a reset pin main body 31, the bushing 36 is fitted onto one bank 16 of the main body A facing the front end surface side of the lever member 20, and the bush 36 is fitted onto the other bank 15 via a coil spring 37. The reset pin main body 31 that fits into the guide hole 36a is loosely fitted into the guide hole 36a.

The reset pin main body 31 has step-like cylindrical portions 33 and 34 formed in the opening space 17 facing the engagement recess 21 and consisting of a small-diameter circumferential surface and a large-diameter circumferential surface that are formed concentrically with the shaft diameter. In particular, the small-diameter circumferential surface of the first engagement step 33 is formed into a reversely inclined surface shape so that the engagement recess 21 can be reliably captured.

Next, the operation of this embodiment will be mainly explained.

First, move the reset pin 30 to the position shown in FIG.
is the position shown in FIG. 3A], by gripping the lever member 20 provided in the grip portion toward the grip hand and rotating the lever member 20, one end portion 52a of the branched link member 50 is rotated. Fuel gas passage 10
When the on-off valve 40 is pressed and the valve 40 is opened, the reset pin 3 is released based on the biased elastic force.
The first engagement step 33 of 0 engages with the engagement recess 21 on the lever member 20 side [see FIGS. 2b and 3b],
At this point, combustion gas is supplied into the gas passage 10 and passes through the gas regulating valve 4 and the preheating pipe 2 to the crater 3.
Fuel gas is injected and ignited.

After the ignition is completed, by gripping the lever member 20 provided in the grip again toward the grip and rotating it further, the other tip 52b of the branched link member 50 opens the opening/closing valve 40' of the oxygen passage 11. When the valve 40' is opened, the second engagement step 34 of the reset pin 30 engages with the engagement recess 21 on the lever member 20 side based on the biased elastic force. 2c, 3c] At this point, oxygen gas is supplied into the passage 11, and the preheated oxygen is injected together with the fuel gas from the crater 3 via the preheating oxygen regulating valve 5 and the preheating pipe 2. At this time, since the opening degrees of the preheating oxygen regulating valve 5 and the fuel gas regulating valve 4 have already been adjusted, a predetermined preheating flame is automatically formed.

Thereafter, the predetermined cutting is performed by opening the cutting oxygen valve 6 and blowing out cutting oxygen.

After the cutting process is completed, after closing the cutting oxygen valve 6, by pressing the reset pin 30 at the position shown in FIG. 3c against the elastic force,
First, the engagement between the second engagement step 34 and the engagement recess 21 is released, and at the same time, the first engagement step 33 and the engagement recess 21 are engaged, whereby the lever member 20 is moved by elastic force. Return to the position shown in Figure 3b, and oxygen passage 1
The first on-off valve 40' is closed.

By further pressing the reset pin 30, the engagement between the first engagement step 33 and the engagement recess 21 is further released, and the lever member 20 is returned to its original position as shown in FIG. 3a by elastic force. It returns and the on-off valve 40 of the fuel gas passage 10 is closed.

Therefore, according to this embodiment, since the lever member 20 can be rotated and the reset pin 30 can be pressed by operating the grip portion only with the grip hand, the grip portion is connected to the various adjustment valves 4, 5, and 6. A fuel gas passage 10 and an oxygen passage 11 can be opened and closed with a one-handed operation and with a time lag, thereby making it possible to easily and reliably perform cutting work without complicating operability.

Next, in order to clarify the operation of this embodiment, the following three points will be explained in detail.

First, the stroke amount is adjusted by operating the lever member 20.
In relation to L1 and L2, the fuel gas on-off valve 4
The reason why 0 is opened and closed by pressing first will be explained in detail.

For example, as shown in FIG. 7, if we consider actual values for explanation purposes, as shown in (A), by raising the lever member 20, a load is applied to the fulcrum 22 of the link member 50 (Fig. (moves upward and to the right), thereby causing the link member 50 tips 52a and 52b to
A load is applied to the valve head 45 and the opening/closing valves 40 and 40' are sequentially opened.

Next, enter the real values shown in FIG. 7B and consider: If the force at the fulcrum 22 of the link member 50 is F, then
Due to the component force of the vector, F = F ₁ + F ₂ , and component force F ₁ = [Sinβ/Sin{180°−(α+β)}]・F = [Sin57°/Sin{180°−(45°+57°) }] ・F=0.857F Also, component force F ₂ = [Sinα/Sin{180°−(α+β)}]・F=[Sin45°/Sin{180°−(45°+57°)}] ・F= 0.723F Therefore, F ₁ (fuel gas side) > F ₂ (oxygen side).

Next, the pressing force of the tip portions 52a and 52b of the link member 50 that presses the valve head 45 from the component forces of F ₁ and F ₂
Calculating F3 and F4, component force F3=F ₁ ×Sinα1 =0.857F×Sin45°=0.606F component force F4=F ₁ ×Sinβ1 =0.723F×Sin33°=0.394F Therefore, F3 (fuel gas side)> It becomes F4 (oxygen side).

Further, as shown in FIG. 4, the valve head 45 always presses the tip portions 52a and 52b of the link member 50 due to the biasing force of the spring 41.

Therefore, when the lever member 20 is gripped and a load F begins to be applied to the fulcrum 22, a larger load is applied to the fuel gas side than the oxygen side due to the relationship F3>F4, and the valve head 45a on the fuel gas side is When the button is pressed, the on-off valve 40 begins to open.

When the lever member 20 is further pushed up, the valve head 45a
While moving backward, the tip 52a of the link member 50 hits the main body. (See FIG. 2b) Then, the contact portion 52a acts as a fulcrum and pushes the oxygen side valve head 45b, so that the oxygen is fully opened in the shape of the letter C in FIG.

Next, we will discuss the mechanism when the engagement recess of the reset pin 30 and the lever member 20 are displaced from the engagement steps 33 and 34, especially when the lever member rotates.
We will explain in detail why the values change like b and c.

First, in the state shown in FIGS. 2a and 3a, the lever member 20 is in a free state, and the lever member 20 is pressed against the engaging step portion 33 of the reset pin 31 by the spring 37.

From this state, if you push up the lever member 20 in the direction of the arrow shown in FIG.
The lever member 20 rotates about the axis of the fulcrum 27 because it is pressed by the spring 37.

Then, when the lever member 20 rotates by a certain angle α as shown in FIG. , as shown in FIG. 3b, the engagement step 33 (φd2) enters and comes into contact with the engagement step 34.

Furthermore, when the lever member 20 is pushed up and rotated by a certain angle β as shown in FIG. 2b, the lever member 20
The tip 21a of the reset pin 31 is removed from the stepped part with the reset pin 34, and the reset pin 31 becomes free again, and as shown in FIG. .

Finally, the mechanism by which the reset pin 21 is pressed after the cutting process is completed and returns to its original state as shown in FIGS. 3a and 2a will be explained.

In the working state, that is, the state shown in FIG. 3 and FIG. 2C, the link member 50 as shown in FIG.
is always pressed by the spring 41 on the oxygen side and the fuel gas side, and a force that tends to push down the lever member 20 downward about the fulcrum 27 is always acting on the link member 50.

However, in this state, the tip portion 21a of the lever member 20 is hooked on the second engaging step portion 34 of the reset pin 31, and the lever member 20 does not go down.

When the reset pin 31 is successively pressed in this state, the reset pin 31 shifts from the state shown in FIG. 2b to the state shown in FIG.

At this time, the tip of the lever member 20 is not caught on the reset pin 21 and the spring 41 is
The minimum diameter of the reset pin is determined so that the lever member 20 falls to the lowest position in FIG. 2a with a force of .

"Effects of the Invention" As described above, according to the present invention, the lever member including the link member for controlling the opening and closing of the on-off valve and the reset pin are directly attached to the integrally molded main body. It can be assembled to the main body side independently of the grip member that makes up the grip, making it easy to assemble, and by rotating the lever member, the fuel gas passage communicating with the various regulating valves and the oxygen The passage can be opened and closed with one hand and at different times, making it possible to perform cutting operations without having to adjust the openings of the various regulating valves, making the process efficient and smooth without requiring any skill. Can perform cutting work.

[Brief explanation of the drawing]

1 to 6 show a blowpipe according to an embodiment of the present invention, in which FIG. 1 is an overall front view, and FIGS. 2 and 3 are action views showing operating conditions of a lever member and a reset pin. Figure 4 is an enlarged front view of the main body with a cutout.
FIG. 5 is a sectional view taken along line Y-Y', and FIG. 6 is an enlarged cutaway plan view of the main body portion. FIGS. 7A and 7B are explanatory diagrams for explaining the actions of the lever member and the link member. A...Main body, B...Grip member, 4, 5, 6...
Various adjustment valves, 7... Gas adjustment section, 8, 9... Hose attachment port, 10, 11... Passage, 17... Opening space, 40, 40'... Opening/closing valve, 20... Lever member, 30... ...Reset pin.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Fuel gas and oxygen supplied from the respective mounting ports through hose mounting ports arranged above and below and a pair of on-off valves connected to the hose mounting ports. It has a main body integrally molded with a pair of passages leading to each regulating valve and a gas regulating section equipped with at least each of the regulating valves, and on both sides of the vertical wall on which the pair of opening/closing valves are provided. A pair of passages are arranged side by side, and an opening space is formed at the center of the main body on the front side of the vertical wall, sandwiched between the pair of passages, and an elastic force is applied in the valve closing direction, and the valve head is pushed against the elastic force. The valve head of each on-off valve, which is configured to be openable by pressing, protrudes from the vertical wall toward the opening space 17, and the pair of valves are inserted into the opening space via a link member. A lever member whose head is pivotally supported at a predetermined position so as to be operable by pressing, and a reset pin disposed so as to be able to engage with a recess provided at a predetermined location of the lever member are provided, and the link member is moved by the swinging operation of the lever member. and the opening/closing valves are opened through the valve heads, and in the open position, a reset pin engages with the recess of the lever member, and by pressing the reset pin, the engagement of the reset pin can be released from the recess of the lever member. A blowpipe characterized by its structure. 2. The lever member and the reset pin operating section are
2. The blowpipe with a grip portion according to claim 1, wherein at least a portion of the main body is covered with the grip member and is directly exposed to the outside without being hidden by a grip member constituting the grip portion.