JP3450130B2 - Pipe cutter capable of cutting water - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutter capable of cutting water not only for cutting the pipe, but also for cutting the pipe halfway to keep the pipe in a water cut state.

[0002]

2. Description of the Related Art Heretofore, as this type of pipe cutter capable of water cutoff, those disclosed in Japanese Utility Model Publication No. 2-14739 and Japanese Patent Publication No. 7-121311 are known. This pipe cutter is shaped like a slightly larger plier, and by repeatedly opening and closing the pair of lever handles, the chopping feed unit is operated to gradually bring the pipe receiving portion and the cutting blade closer to each other. It has become.

Therefore, if the pipe P is sandwiched between the pipe receiving portion R and the cutting blade C as shown in FIG. 6, the pipe P can be cut by the mutual approach thereof.
Also, stop cutting of the cutting blade C in the middle of the pipe diameter,
When the cutting blade C is pierced into the inner surface of the pipe P, the side surface of the cutting blade C closes the inside of the pipe P, so that the water cut state can be maintained.

When this pipe cutter is used, for example, as shown in FIG.
Even if there is a water leakage accident in one of the plurality of branch pipe portions 52 that are branched and connected from the water supply pipe 50 at the portion X that is closer to the water main pipe 51 than the water stopcock 50, one water pipe main pipe 51
Since the corresponding branch pipe portion 52 can be repaired without stopping the plug itself, the convenience that the water blocking does not affect the other branch pipe portions 52 is obtained.

[0005]

In the conventional pipe cutter, the cutting blade C is used to bring the pipe P into a water-free state.
In the case of stopping in the middle of the pipe diameter, the position where the cutting blade C is stopped, that is, the timing at which the operation of the lever handle is stopped is determined by the operator roughly.
For this reason, there are cases in which the water leakage cannot be completely stopped even after the water is cut off, or the pipe P is cut off with excessive force.

The present invention has been made in view of the above circumstances, and can reliably and easily stop the cutting blade halfway when making a pipe in a water-stop state, and also reliably prevent water leakage under a water-stop state. An object of the present invention is to provide a pipe cutter capable of water cutoff operation.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is, in the present invention, the slip mechanism is provided for the sizing feed means for moving the cutting blade. This slip mechanism allows the cutting blade to bite into the pipe when the feed amount of the cutting blade reaches the point where one pipe wall of the pipe is left, that is, the cutting edge of the cutting blade pierces the inner surface of the pipe. This is to prevent the cutting blade from moving even if the lever handles are repeatedly opened and closed in the event of a failure. Therefore, you will not cut the pipe too quickly.

Therefore, since it is sufficient to continue the opening / closing operation of the lever handle until the cutting blade does not move in this way, the operator does not need to use any nerve to operate the lever handle. Also, in other words, when the cutting blade does not move even when the lever handle is opened and closed, the cutting blade has reached the necessary and sufficient predetermined feed amount at that time. There
Water leakage from this part can be completely stopped.

The knurling means generally has a structure having a knurled tooth body and a stepping tooth which engages with the knurled tooth body. In this case, the slip mechanism has a structure that includes a stopper piece that interferes with the mutual proximity of the knurled tooth body and the stepping tooth, and an operation knob that can switch the stopper piece between the operating position and the non-operating position. do it. The stopper piece is
For example, it can be formed by an eccentric cam or the like. In addition, the operation knob is on the side of the swing base of the lever handle,
It may be provided in a protruding shape.

In this structure, when the lever handle is opened and closed, the stopper piece prevents the knurled tooth body and the stepping tooth from engaging with each other due to the driving force transmitted to the knurled feeding means by the operation. Then, it is set in the idling state. This prevents the driving force from being transmitted to the cutting blade. As is clear from this, even if the cutting blade is stuck, the lever handle can still be opened and closed. Therefore, unlike when adopting a structure that stops the cutting blade, for example, the operation of the lever handle does not suddenly become impossible and the hand does not hurt. There is no risk of structural wear, deformation, or damage.

As a structure for solving the problem to be solved in the conventional pipe cutter, it is possible to adopt a structure in which the cutting blade is stopped. In such a pipe cutter, either lever handle,
It is preferable to provide a holding tool for holding the closed state with the other lever handle. This holding tool is convenient for preventing the lever handles from opening and closing each other when the pipe cutter is not in use, and for making a compact storage state.

Further, if a tightening operation portion capable of further tightening the closed state of both lever handles is provided for this squeezing tool, when the pipe is cut off by operating the slip mechanism. This state can be maintained by hand. In particular, by providing this tightening operation part, it is possible to kill the play that occurs in the closed state of the lever handles and to prevent rattling of them, so that the water-off state can be maintained reliably and firmly, and the water leakage prevention effect is also reliable. Become.

Such a tightening operation portion can be formed by a cam whose contact degree can be changed with respect to the back side of the lever handle on the side opposite to the side where the hugging tool is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a pipe cutter 1 according to the present invention. This pipe cutter 1
Is a pair of lever handles 3 and 4 that can be opened and closed with the connecting shaft 2 as a fulcrum, and a pipe receiving portion 5 that extends beyond the connecting shaft 2 with respect to one lever handle 3 and extends to the opposite side. Of the same lever handle 3, a cutting blade 9 swingably held by a pivot 8 so as to move toward and away from the pipe receiving portion 5, and a tail portion of the cutting blade 9 and the other lever handle 4. Interval feeding means 10 composed of
And a holding tool 11 provided on the protruding end side of one of the lever handles 4.

A lever handle 3 having a pipe receiving portion 5
Has a shape extending in a “V” shape from a portion holding the connecting shaft 2, and the pivot 8 is positioned at the bent portion. The central portion in the thickness direction of the portion holding the connecting shaft 2 and the pivot shaft 8 is a slit-shaped space, and the swinging of the cutting blade 9 and the like can be accommodated in this space. . The handle portion itself has a U-shaped cross section.

The space in the central portion in the width direction provided in the lever handle 3 extends to the pipe receiving portion 5, so that interference between the cutting edge of the cutting blade 9 and the pipe receiving portion 5 is prevented. It The upper surface of the pipe receiving portion 5 is formed as a concave surface so as to stably support a plurality of types of pipes P having different sizes. The other lever handle 4
Has a shape that extends straight from the portion that holds the connecting shaft 2, and has a U-shaped cross section.

The lever handles 3 and 4 as described above are urged by the winding spring 13 fitted to the connecting shaft 2 in a direction in which they repel each other (opening direction). The cutting blade 9 has a curved shape such that the cutting edge shape thereof projects so as to correspond to the upper surface of the pipe receiving portion 5. As a result, when the cutting blade 9 bites into the pipe P, the length of the blade tip piercing the inner surface of the pipe is made as long as possible. Further, the cross-sectional shape of the cutting blade 9 has a certain thickness except for the cutting edge, as shown in FIG. 6, in order to easily obtain the water cutoff action when the cutting blade 9 bites into the pipe P.

The chopping feed means 10 has a chopping tooth body 16 that is swingably held by a straight lever handle 4 via a pivot 15, and a stepping tooth 17 formed on the tail of the cutting blade 9. And a link 18 connecting the cut tooth body 16 and the cutting tooth 9. Further, a slip mechanism 20 is provided in the crush feed means 10. Chopped tooth 16
Has a plurality of knurled teeth 16 that are aligned in a serrated pattern and protrude.
a. The step teeth 17 can be engaged with each of the step teeth 16a.
The knurled tooth body 16 is formed by the winding spring 2 fitted on the pivot 15.
1 urges the lever handle 4 in the rising direction.

Therefore, when the lever handles 3 and 4 are operated in the opening direction, the knurled tooth 16 rises and the cutting blade 9
Of the lever handle 3, 4
Is operated in the closing direction, the knurled tooth body 16 and the stepping tooth 1
The stepping teeth 17 are pushed out while the engagement state with 7 is maintained, and the drive transmission occurs in which the cutting blade 9 is sent toward the pipe receiving portion 5 by one pitch.

Therefore, if the opening / closing operation of the lever handles 3 and 4 is repeated, the stepping teeth 17 are sequentially fed from the toothed teeth 16a on the root side of the toothed teeth 16 toward the toothed teeth 16a on the tip side, and as a result, cutting The blade 9 enables the operation of cutting the pipe P or cutting off the water. As shown in FIG. 4, the slip mechanism 20 includes a stopper piece 23 circumscribing the outer peripheral portion of the notched tooth body 16 near the pivot 15 and the stopper piece 23.
The operation knob 25 provided on the rotating shaft 24 of the.

The stopper piece 23 is formed in a short cylindrical shape that is eccentrically provided on the rotary shaft 24. Further, the operation knob 25 is rotatable integrally with the rotary shaft 24, and is provided so as to project on the side surface of the swing base of the lever handle 4 having a straight shape. In addition, this lever handle 4
A knob guide 26 for limiting the operation amount of the operation knob 25 is provided on the projection.

That is, the slip mechanism 20 uses the principle of the eccentric cam, and the operation knob 25 is about 1 /
By making about 4 rotations, the stopper piece 23 is cut and the tooth body 1
Make it stick out toward 6 or pull it in the opposite direction. Therefore, when the stopper piece 23 is in a protruding state (see FIG. 1), the range in which the toothed body 16 swings in the rising direction is narrowed. Therefore, with respect to the stepped tooth body 16, when the stepped tooth 17 is progressively advanced in the engaged state from the root side stepped tooth 16a toward the tip side stepped tooth 16a, the stepped tooth 17 is most It is not possible to reach the cut tooth 16a at the tip position.

As a result, the movement of the cutting blade 9 toward the pipe receiving portion 5 is also stopped. This state is the working position of the stopper piece 23, that is, the position at which the water cutoff operation is caused. At this time, the operation knob 25 is in the state of the oblique posture shown in FIG. On the other hand, when the stopper piece 23 is retracted (see FIG. 2), the range in which the knurled tooth body 16 swings in the rising direction is widened, and the knurled tooth body 16 and the stepping tooth 17 can be engaged with each other. The range will be allowed as much as possible. That is, the stepping teeth 17 are the toothed teeth 16
To reach the cut tooth 16a at the most tip position.

As a result, the cutting blade 9 can continue to move until it reaches the pipe receiving portion 5, and the pipe P can be cut. This state is the non-acting position of the stopper piece 23. At this time, the operation knob 25 is in the horizontal posture shown in FIG. In the case of the present embodiment, when the operation knob 25 is set at an intermediate position between the postures of FIG. 4 and the posture of FIG. 3, the rising angle of the notched tooth body 16 is regulated to halfway. , Lever handle 3,
When 4 is operated in the closing direction, the engagement timing with the step tooth 17 is delayed. Therefore, the step teeth 17
In this configuration, the knurled teeth 16a are engaged with the knurled tooth body 16 by skipping every two teeth, and as a result, an action as a fast-forward mechanism can be obtained.

As shown in FIG. 5, the holding tool 11 is formed of a wire material in a rectangular frame shape, and the protruding end portion of the lever handle 3 on the other side can be fitted into the frame. . A fastening operation unit 29 is provided on the holding tool 11. The tightening operation part 29 uses the principle of an eccentric cam, and has a short columnar cam piece 30.
And an operation lever portion 31 protruding outward in the radial direction.

Therefore, as shown in FIG. 1, with the holding tool 11 fitted in the lever handle 3 on the other side, the lever lever 3 is turned over by reversing the operation lever portion 31.
The contact degree of the cam piece 30 with respect to the back side of the is increased. As a result, when the lever handles 3 and 4 are closed, and particularly when the stopper piece 23 is set to the water-cutting operation position, the association that occurs between the lever handles 3 and 4 is killed, and there is no rattling. it can.

As described above, in the pipe cutter 1 according to the present invention, after the operation knob 25 is switched between the water cut operation position and the cutting position, the pipe P is sandwiched between the pipe receiving portion 5 and the cutting blade 9. The lever handles 3 and 4 may be repeatedly opened and closed. By the way, the present invention is not limited to the above embodiment.

For example, the knurled tooth body 16 is illustrated as a linear plate piece, but it may be curved in an arc shape. Also,
The stopper piece 23 of the slip mechanism 20 is not limited to the position shown in the drawing, and may be any position as long as it can regulate the swing range of the notched tooth body 16. Therefore, for example, an elongated hole or the like may be formed in the cut tooth body 16, and a stopper piece formed in an eccentric cam shape may be provided in the elongated hole.

Without employing such a slip mechanism 20,
The cutting blade 9 may be provided with a stopper that can stop the movement of the cutting blade 9 at a predetermined feed amount (water cut operation position). In this case, the stopper may have a structure in which the action / non-action is switched by attaching / detaching a pin, or a position changing structure by rotation like the stopper piece 23 described above.

Since the knurled tooth body 16 and the stepping tooth 17 are relative in the knives feeding means 10, the knurled tooth body 16 is provided on the tail side of the cutting blade 9 and the lever handle 4 is provided.
The step teeth 17 may be provided on the side. Cutting blade 9
It is also possible to form the blade edge in a straight line.
The tightening operation part 29 provided on the squeezing tool 11 may be configured to press the back part of the lever handle 3 toward the lever handle 3 side by a screw feeding mechanism.

Further, contrary to the case of the above-mentioned embodiment, the holding tool 11 can be provided on the lever handle 3. The pipe P can be used not only for a resin pipe but also for a metal pipe.

[0032]

As apparent from the above description, in the pipe cutter according to the present invention, which is capable of water cutoff operation, when the lever handles of both of them are opened and closed, the cutting blade can be stopped halfway reliably and easily. Therefore, it is possible to surely and easily make the pipe in a water-free state. In addition, along with this, it becomes possible to reliably prevent water leakage even in a water-stopped state.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a pipe cutter according to the present invention in a water cut operation state.

FIG. 2 is a side sectional view showing the pipe cutter according to the present invention in an unoperated state.

FIG. 3 is a perspective view of a pipe cutter according to the present invention.

FIG. 4 is a perspective view showing a slip mechanism provided for the sizing feed means.

FIG. 5 is a perspective view showing a tightening operation section provided for the squeezing tool.

FIG. 6 is a diagram for explaining the principle of making it possible to switch between cutting the pipe and cutting water.

FIG. 7 is a diagram explaining a water leakage accident site where this type of pipe cutter is required.

[Explanation of symbols]

1 pipe cutter 3 lever handle 4 lever handle 9 cutting blades 10 increment feeding means 11 Hugs 16 chopped tooth 17 stepping teeth 20 Slip mechanism 23 Stopper piece 25 Operation knob 29 Tightening operation section P pipe

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Claims (5)

(57) [Claims] 1. A cutting blade (9) capable of holding the inside of the pipe (P) in a water-free state by repeatedly opening and closing a pair of lever handles (3, 4) by a chopping feed means (10). In a pipe cutter capable of sequentially feeding water to a portion (5), the feed amount after the cutting blade (9) is bitten into the pipe (P) in the chopping feed means (10) is the pipe (P). 2. A pipe cutter capable of water cutoff operation, comprising a slip mechanism (20) capable of idling the drive transmission to the cutting blade (9) when reaching a place where one of the pipe walls is left. 2. A stepping tooth (1) in which the step feed means (10) engages the step tooth body (16) and the step tooth body (16).
7) and the slip mechanism (20)
Is a stopper piece (23) that interferes with the mutual proximity of the notched tooth body (16) and the stepping tooth (17), and the stopper piece (23).
The pipe cutter according to claim 1, further comprising: an operation knob (25) capable of switching between a working position and a non-working position. 3. A squeezing tool for holding a closed state of the lever handle (4) with the other lever handle (3) when the cutting blade (9) is sent to the water cut action position. 11) is provided, and the hug (1
The water shutoff operation according to claim 1 or 2, characterized in that 1) is provided with a tightening operation part (29) capable of further tightening the closed state of both lever handles (3, 4). Possible pipe cutter. 4. The cam in which the tightening operation part (29) has a variable contact degree with respect to the back side of the lever handle (3) on the side opposite to where the hugging device (11) is provided. The water-operable pipe cutter according to claim 3, wherein the pipe cutter is formed by: 5. A cutting blade (9) capable of holding the inside of the pipe (P) in a water-off state by repeatedly opening and closing a pair of lever handles (3, 4) by means of a chopping-feed means (10). In a pipe cutter capable of cutting water to a part (5) in sequence, the cutting blade (9) can be stopped when it is bitten into a pipe (P) until a piece of its pipe wall is left. A pipe cutter that can be operated without water.