JPH07276298A - Punching pliers for gas recovery and exchange type gas extracting needle to be used for the same - Google Patents

Abstract

PURPOSE:To provide a pair of gas recovery punching pliers and an exchange type gas extracting needle in which even if a needle is broken, it can be exchanged for a different new needle by adopting a gas extracting needle that can be exchanged. CONSTITUTION:The tip column portion of a lower jaw member 3 possesses a needle hitting relief hole 3c and a piping receiving portion 3d of a circular arclike groove. The tip column portion of an upper jaw member 1 possesses a penetrating oblong hole 1a and a stepped oblong hole 1b. On the lower side of the upper jaw member 1, a needle fitting portion 12 is fixed through a tightening bolt 9 and with a biting washer 11 interposed. A needle head 12 possesses a screw hole 12a into which the screw portion 9a of the tightening bolt 9 is screwed; a needle fitting screw hole 12d that is piercingly provided in this axial direction and communicates with an inner space S; and an exchange type gas extracting needle 20 screwed into this. A needle position regulating mechanism is made up of the oblong held 1a and the bolt 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforation plier for recovering gas such as CFC gas and an exchange type gas extraction needle used for the same.

[0002]

2. Description of the Related Art Recently, the chlorine content of Freon gas destroys the ozone layer in the stratosphere to enlarge the ozone hole and increase the intensity of terrestrial ultraviolet rays, which may increase the incidence of skin cancer, etc. A problem has been raised. There is an urgent need to prohibit the manufacture and sale of CFCs and develop refrigerants that can replace CFCs. However, the amount of CFCs currently in use is enormous, so this handling cannot be neglected. For example, instead of scrapping a refrigerating cycle device such as a discarded refrigerator or air conditioner as it is, it is necessary to completely withdraw and recover the existing CFC gas used for it. It can be seen that local governments that are serious about environmental protection have already collected CFCs from waste refrigerators.

Generally, a tool called a gas recovery drilling plier is used to recover the CFC gas filled in the heat exchange system of a refrigerator or the like. This gas recovery hole punching plier has an upper jaw member and a lower jaw member, and a pinching plier mechanism that can be held with one hand, and a locking mechanism that maintains or releases the pinched state between the upper jaw member and the lower jaw member. And the lower jaw member is formed with a pipe receiving portion for receiving an arc surface of a Freon gas pipe (diameter of several mm), and the upper jaw member has a gas extracting needle to be communicated with the recovery pipe. Is stuck.

In CFC gas recovery, a gas suction recovery machine is connected to the gas extraction needle side of the gas recovery drilling pliers via a recovery piping, and then a gas recovery drilling plier is connected to the high pressure side piping of a heat exchange system such as a refrigerator. When the gripping lever is gripped while the pipe receiving portion of the lower jaw member is in contact with the gripping lever, the oblique tip of the gas extraction needle pierces the side surface of the high pressure side pipe and is pierced. As a result, the high-pressure side pipe communicates with the gas suction / collection device through the gas extraction needle and the collection pipe, so that the collection device side can draw and collect the fluorocarbon gas from the heat exchange system. To check the completion of extraction, tighten the valve (strip valve) on the recovery machine side to temporarily shut off the communication between the recovery piping and the gas suction recovery machine, and then use a compound gauge installed in the middle of the recovery piping to apply negative pressure. I hope

[0005]

However, the above gas recovery hole forming pliers have the following problems.

That is, if the frequency of use increases or if the gas extraction needle and the pipe are inaccurately contacted, the tip of the gas extraction needle may be damaged. Since the gas extraction needle is fixed to the upper jaw member of the gas recovery drilling plier, the entire needle head (needle mounting part) must be replaced with a new one even if only part of the needle is damaged, which reduces tool costs. Due to the increase, the cost of recovering CFC gas has been increased.

Therefore, in view of the above problems, an object of the present invention is to use a replaceable gas extraction needle so that even if the needle is damaged, it can be replaced with another new needle and a gas recovery hole plier. It is to realize an exchange-type gas extraction needle.

[0008]

In order to solve the above-mentioned problems, the present invention provides a sandwiching plier mechanism having a first jaw member and a second jaw member, a first jaw member and a second jaw. A lock mechanism for maintaining or releasing the sandwiched state with the member, a pipe receiving portion formed on the second jaw member, and a gas extraction needle which is fixed to the first jaw member side and should be communicated with the recovery pipe. In the gas recovery hole punching plier, the gas extraction needle is screwed to the needle mounting portion.

Here, in the gas recovery drilling plier having the exchangeable needle having the above-mentioned structure, the needle mounting portion has a needle position adjusting mechanism capable of displacement positioning with respect to the first jaw member. It is desirable to consist of The needle position adjusting mechanism may have a long hole penetrating the first jaw member and a fastening bolt screwed into the needle mounting portion through the long hole. . In such a case, it is preferable that a catch washer is interposed between the first jaw member and the needle mounting portion and a fastening bolt is screwed therein.

As the exchangeable gas extraction needle used in the above-mentioned gas recovery drilling pliers, a wrench-fitting collar portion provided in the middle of the needle tube and an outer peripheral surface of the needle tube from the collar portion to the base side. And a piercing part formed from the flange part to the tip part of the needle tube. Here, it is possible to adopt a configuration in which the collar portion is composed of arc portions that face each other and straight portions that face each other.

[0011]

As described above, in the gas recovery hole punching pliers configured such that the gas extraction needle is screwed to the needle mounting portion, if the gas removal needle is damaged, the damaged gas removal needle can be easily removed from the needle mounting portion. It can be loosened and removed, and a new gas extraction needle can be screwed on for easy installation. Therefore, since it is not necessary to replace the entire needle mounting portion, the tool cost is very low, the gas recovery cost can be reduced, and the requirement for CFC gas recovery becomes easy.

By the way, the replacement of the gas extraction needle has been achieved by screwing, but since the threading of the needle or the needle mounting portion is slightly different depending on the product, a new needle is rotated and screwed. In this case, the tip of the beveled tip surface of the needle insertion portion is slightly rotated and displaced from the position of the needle tip before replacement due to the variation (variation) of the thread cutting end. If the tip of the beveled tip surface does not hit the centerline (belly line) of the generatrix of the peripheral surface of the pipe to be inserted, the tip will slip on the arc surface, causing needle damage and penetrating the insertion hole at an irregular position. Will happen. However, in the present invention, since the needle position adjusting mechanism is provided, it is possible to shift the needle tip in advance to an appropriate portion of the pipe and align it, without the above-mentioned inconvenience, and it is possible to substantially use the replaceable needle. became. Although various types of needle position adjusting mechanisms can be adopted, in the present invention, in order to simplify the configuration and reduce the number of parts, for example, an elongated hole penetrating the first jaw member,
A fastening bolt that is screwed into the needle mounting portion through the elongated hole. When a biting washer is interposed between the first jaw member and the needle mounting portion,
The anchor effect of the bite washer prevents the needle mount from unintentionally rotating relative to the first jaw member due to screwing of the fastening bolt.

The exchange-type gas extraction needle used in such a gas recovery drilling plier may be one having a male thread portion on the outer peripheral surface of the needle tube on the base side, but since the needle has a small diameter, it is left as it is. With the shape, it is not easy to handle such as screwing. Therefore, the exchange-type gas extraction needle of the present invention has a wrench-fitting collar portion formed in the middle of the needle tube. By fitting this wrench into the wrench fitting part of the dedicated wrench and turning it, it becomes easy to attach and detach the needle. As the shape of the flange portion, it is very simple to have a structure including arc portions facing each other and linear portions facing each other, and it is possible to form the flange portions by cutting the facing portions of the circular collar portion. , Easy to manufacture.

[0014]

Embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 (a) is a side view showing a perforation pliers for recovering fluorocarbon gas according to an embodiment of the present invention, FIG. 1 (b).
FIG. 1 is a side view showing a state in which the CFC gas recovery drilling plier is applied to the pipe, and FIG. 1C is a side view showing a condition in which the CFC gas recovery drilling plier is drilled in the pipe. FIG. 2 is an exploded perspective view showing a main part of the drilling plier for recovering fluorocarbon gas. FIG. 3 is an explanatory view for explaining an operation of aligning with a needle position adjusting mechanism in the freon gas recovery drilling plier.

The basic structure of the piercing pliers 10 for collecting fluorocarbon gas of the present embodiment is such that a grip portion 2 having an upper jaw member 1 on the tip side and a lower jaw member 3 rotatable with respect to a pivot 2a of the grip portion 2. And a tension coil spring 4 stretched between a spring hooking hole 3a at the base of the lower jaw member 3 and a cut-and-raised piece 2b of the grip portion 2, and a grip that is rotatable with respect to a pivot 3b at the base of the lower jaw member 3. The gripping lever 5, the one end of which is pivotable to the pivot shaft 5a at the base end of the gripping lever 5, and the other end of which is abutted against the tip end 7a of the sandwiching adjusting screw 7 and which is pivotable about the abutment link 6; Lever 5
And a lock release lever 8 having a lever action portion 8a that is rotatable on the tip end side pivot shaft 5b and presses the protruding piece 6a of the link 6 by lever action. The grip portion 2, the lower jaw member 3, the grip lever 5, and the abutment link 6 constitute a sandwiching plier mechanism which is a lever mechanism of a four-bar linkage. When the pivots 3b and 5a and the tip 7a of the sandwiching adjusting screw 7 are aligned with each other in a straight line, the dead point of the link mechanism (toggle mechanism) is generated, so that a boosting force is generated as a sandwiching force between the upper jaw member 1 and the lower jaw member 3. , The lower jaw member 3 remains locked. To release the locked state, the lock release lever 8 is moved in the direction of the broken line arrow in FIG. 1A, the lever action portion 8a jumps up, and the abutment link 6 is rotated counterclockwise, so that the link mechanism has a dead point. And the initial state (state of FIG. 1A) is restored by the biasing force of the tension coil spring 4.

As shown in FIG. 2, the tip cylindrical portion of the lower jaw member 3 of this embodiment has a needle contact relief hole 3c and a pipe receiving portion 3 having an arcuate groove formed so as to pass over the hole.
have d. Further, the tip cylindrical portion of the upper jaw member 1 of this example has a through hole 1a and a stepped hole 1b. The elongated hole 1a is a hole through which the threaded portion 9a of the fastening bolt 9 is inserted, and the stepped elongated hole 1b is a hole that hides the head portion 9b of the tightening bolt 9. Below the tip cylindrical portion of the upper jaw member 1,
A needle head (needle mounting portion) 12 is fixed via fastening bolts 9 with a serrated washer 11 sandwiched between the front and back surfaces. This needle head 12
Is a screw hole 1 into which the screw portion 9a of the tightening bolt 9 is screwed.
2a and the extraction hole 1 communicating with the inner space S that remains unclosed even when the screw portion 9a is screwed into the screw hole 12a.
2b, a threaded portion 12c for connecting a pipe to the extraction machine 12b on the recovery machine side, a need mounting screw hole 12d bored in the axial direction of the screw hole 12a and communicating with the inner space S, and this need mounting screw hole It has an exchange type gas extraction needle 20 screwed into 12d and a packing 21 fitted in a cylindrical hole 12e at the lower end in a tight fit.

The replaceable gas extraction needle 20 has a wrench-fitting collar 23 provided in the middle of the needle tube 22.
And a male threaded portion 24 formed on the outer peripheral surface of the needle tube 22 from the collar portion 23 to the base side, and a stab portion 25 formed from the collar portion 23 of the needle tube 22 to the tip portion. The piercing part 25 has a beveled point 25a. And, the collar portion 23 of the present example is a circular arc portion 23 facing each other.
a, 23a and linear portions 23b, 23b facing each other.

In the pliers 10 of this embodiment, a relay U-shaped pipe 30 is connected to the threaded portion 12c of the needle head 12.

When the pliers 10 having such a structure are used, a fluorocarbon gas recovering device (not shown) is connected to the relay U-shaped pipe 30 through a recovering pipe, and then, as shown in FIG.
As shown in (b), the pipe receiving portion 3d of the lower jaw member 3
The high-pressure side pipe 40 filled with CFC gas is applied to. When the grasping lever 5 is grasped in the direction of the arrow in FIG. 1 (b), the needle head 12 of the upper jaw member 3 is relatively closed and the tip of the needle 20 pierces the peripheral surface of the high-pressure side pipe 40 to form a hole. open. Therefore, the high pressure side pipe 40
Communicates with a Freon gas recovery machine (not shown) through the needle 20, the inner space S, and the extraction hole 12b. This makes it possible to remove the CFC gas. After recovery, move the lock release lever 8 in the direction of the arrow in FIG.
It is possible to easily return to the initial state of (a).

Here, when the gas removal needle 20 is damaged, if the packing 21 is removed, the flange portion 23 of the damaged gas extraction needle 20 is exposed. Therefore, when the flange portion 23 is turned with a dedicated wrench, the needle is removed. 20 can be removed without translation. Further, when a new gas extraction needle 20 is screwed, it can be easily attached to the needle head 12. Therefore, since it is not necessary to replace the entire needle head, the tool cost is very low and the gas recovery cost can be reduced. Needle 20
At the time of mounting, since the collar portion 23 itself acts as a stopper that prevents excessive screwing, it is possible to eliminate crushing of the needle 20 at the time of mounting.

By the way, the replacement of the gas extraction needle 20 has been accomplished by screwing, but the threading of the needle or needle head is slightly different for each product, so a new needle is rotated and screwed. case, as shown in FIG. 3, the position of the draft distribution threaded end tip P of the needle of Hasujo tip surface 25a is displaced to rotate more or less than the position of the needle tip P ₀ before replacement (angle theta) .
If the tip P of the slanted tip surface does not hit the center line (belly line) 1 of the generatrix of the peripheral surface of the pipe 40 to be inserted, the tip will slide on the arc surface,
The needle may be damaged or the puncture hole may be penetrated at an irregular position. However, since the bolt 9 and the long hole 1a that form the needle position adjusting mechanism are provided, the needle tip P is previously set on the abdominal line 1 of the pipe by Δ.
It can be fixed after being displaced by L and adjusted to P ₀ . As described above, the provision of the needle position adjusting mechanism substantially enables the use of the exchangeable needle.

The needle position adjusting mechanism using the bolt 9 and the elongated hole 1a of this example has the advantages that the structure is simple and the number of parts is small. Since the bite washer 11 is used, the needle head 12 does not inadvertently rotate due to the fastening bolt 9 being screwed in, which is suitable as a simple detent.

Such a hole recovery plier for gas recovery 1
The replaceable degassing needle 20 used in No. 0 has a wrench-fitting collar 23 formed in the middle of the needle tube.

The needle 20 can be easily attached and detached by fitting and turning the flange portion into the fitting portion (female type) of the dedicated wrench. It should be noted that the shape as in this example is easy to manufacture because it can be formed by cutting away the opposing portions of the circular collar portion.

The pliers 10 are not limited to drilling holes for collecting fluorocarbon gas, but can be used generally for drilling holes for collecting the gas filled in the piping.

[0027]

As described above, the gas recovery hole pliers according to the present invention is characterized in that the gas extraction needle is screwed to the needle mounting portion. Therefore, the following effects are obtained.

If the gas extraction needle is damaged,
You can easily loosen and remove a damaged gas extraction needle from the needle mount, and you can easily install a new gas extraction needle by tightening the screw. Therefore, since it is not necessary to replace the entire needle mounting portion, the cost of the tool is very low, the cost of gas recovery can be reduced, and the requirement for the recovery of CFC gas can be promoted.

In the case where the needle position adjusting mechanism is provided, when a new needle is rotated and screwed, the tip of the beveled tip surface of the needle insertion part is replaced by the threaded end before the replacement. Even if the needle tip is rotated to a position slightly displaced from the needle tip, the needle tip can be adjusted in advance to an appropriate portion of the pipe. For this reason, the needle is less likely to be damaged, and the replaceable needle can be used substantially.

In the case where the needle position adjusting mechanism has a long hole penetrating the first jaw member and a fastening bolt screwed into the needle mounting portion through the long hole, the structure is simple. And the number of parts can be reduced.

When the bite washer is interposed between the first jaw member and the needle attachment part, the needle attachment part is inadvertently moved by screwing the fastening bolt due to the anchor effect of the bite washer. It does not rotate with respect to one jaw member.

As a replaceable gas extraction needle used in the above-mentioned gas recovery hole punching pliers, if a flange portion having a wrench fitting shape is formed in the middle of the needle tube, this flange portion is used as a special wrench. The needle can be easily attached and detached by fitting and turning around the fitting part.
Further, when the needle is attached, the collar portion itself acts as a stopper for preventing excessive screwing, so that crushing of the needle during attachment can be eliminated.

As for the shape of the flange portion, it is very simple to have a structure composed of arc portions facing each other and straight portions facing each other. Since it can be formed, it is easy to manufacture.

[Brief description of drawings]

FIG. 1 (a) is a side view showing a fluorocarbon gas recovery drilling plier according to an embodiment of the present invention, (b) is a side view showing the same fluorocarbon gas recovery drilling plier applied to a pipe, and (c). [Fig. 3] is a side view showing a state in which a pipe is perforated by the same freon gas recovery perforation pliers.

FIG. 2 is an exploded perspective view showing a main part of the freon gas recovery hole forming plier.

FIG. 3 is an explanatory view illustrating an operation of aligning with a needle position adjusting mechanism in the freon gas recovery drilling pliers.

[Explanation of symbols]

 10 ... Fluorocarbon gas recovery hole pliers 1 ... Upper jaw member 1a ... Oblong hole 1b ... Stepped oblong hole 2 ... Gripping portions 2a, 3b, 5a, 5b ... Axis 2b ... Cut and raised piece 3 ... Lower upper jaw member 3a ... Spring hook Hole 3c ... Escape hole per needle 3d ... Piping receiving part 4 ... Tension coil spring 5 ... Grip lever 6 ... Abutting link 6a ... Pushing piece 7 ... Clamping adjustment screw 7a ... Tip 8 ... Lock release lever 8a ... Lever action part 9 … Tightening bolt 9a… Screw part 9b… Head part 11… Bit washer 12… Needle head (needle mounting part) 12a… Screw hole 12b… Extraction hole 12c… Screw part 12d… Needle mounting screw hole 12e… Cylindrical hole 20… Replacement needle 21 ... Packing 22 ... Needle tube 23 ... Collar part 23a ... Arc part 23b ... Straight part 24 ... Male screw part 25 ... Stab See section 25a ... slope-shaped tip 30 ... relay for U-shaped pipe S ... inner space. P ... point.

Claims (6)

[Claims] 1. A sandwiching plier mechanism having a first jaw member and a second jaw member, a locking mechanism for maintaining or releasing the sandwiched state between the first jaw member and the second jaw member, and a second In a gas recovery drilling plier including a pipe receiving portion formed on the jaw member and a gas extraction needle that is fixed to the first jaw member side and should be communicated with the recovery pipe, the gas extraction needle is attached to the needle. A hole recovery plier for collecting gas, which is formed by being screwed to a portion. 2. The gas recovery hole pliers according to claim 1, further comprising a needle position adjusting mechanism capable of displacing and positioning the needle mounting portion with respect to the first jaw member. Drill pliers for gas recovery. 3. The gas recovery hole punching pliers according to claim 2, wherein the needle position adjusting mechanism includes an elongated hole penetrating the first jaw member and a screw threaded on the needle mounting portion through the elongated hole. A perforation plier for gas recovery, comprising a fastening bolt to be inserted. 4. The gas recovery hole punching plier according to claim 3, wherein a biting washer is interposed between the first jaw member and the needle mounting portion, and the fastening bolt is screwed into the hole. Gas recovery hole punching pliers. 5. A wrench-fitting-shaped collar portion provided in the middle of the needle tube, a male screw portion formed on the outer peripheral surface of the needle tube from the collar portion to the base side, and the collar portion of the needle tube. And a piercing part formed on the distal end of the exchangeable gas extraction needle. 6. The exchange-type gas extraction needle according to claim 5, wherein the collar portion is composed of arcuate portions facing each other and straight portions facing each other.