JP2898916B2 - Pipe cutter - 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 which can be used for cutting a resin pipe or the like.

[0002]

2. Description of the Related Art Conventionally, as a tool for manually cutting resin pipes used for gas pipes, water supply and sewage pipes, etc., a pipe cutter having a shape like an enlarged pliers is known. This pipe cutter has a pair of lever handles that can swing freely in the opening and closing directions of each other,
It has a pipe receiving portion integrally extended to one lever handle and a cutter blade connected to the other lever handle via a notch feeding means (ratchet mechanism). By opening and closing, the cutter blade gradually approaches the pipe receiving part,
Eventually, the cutter blade reaches a state where it bites into the pipe receiving portion, and the pipe held by the pipe receiving portion can be cut.

[0003]

As the bite of the cutter blade increases in the process of cutting the pipe, the cut surface of the pipe comes into pressure contact with both side surfaces of the cutter blade (commonly referred to as "pipe"). Bites the cutter blade. " Therefore, the cutting resistance suddenly increases, but this cutting resistance is a force that pushes the cutter blade back to the outside of the pipe because the cutter blade has an inclined shape (wedge shape) that becomes thinner as the blade tip. Will work. Such an action reaches a peak at a predetermined time when the uncut portion of the pipe is reduced.

In view of the above, both lever handles are operated once in the closing direction in order to operate the notch feed means by one pitch, and when both lever handles are subsequently operated in the opening direction, the opening operation is accompanied by this opening operation. As a result, the cutter blade and the notching means are pushed back to form an idle feed, and the cutter blade may return to the state immediately before. That is, no matter how many times the lever handles are opened and closed, the cutter blade only repeats forward and backward, and cannot cut the pipe to the end.

On the other hand, in the conventional pipe cutter, the pipe receiving portion is merely formed with a concave curve so that it can contact the outer peripheral surface of the pipe at two or more places. When a cutting load is applied to the pipe,
It is relatively easy for the pipe to be displaced, blurred, tilted, and the like, which may cause positional displacement, rattling, diagonal cutting, and the like of the cut end.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and makes it possible to surely cut a pipe to the end. In addition, the cut end of the pipe is positionally accurate, clean, and positioned with respect to the pipe shaft. It is an object of the present invention to provide a manual pipe cutter which can be obtained in an orthogonal manner.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the present invention according to claim 1, a pair of lever handles, a pipe receiving portion extending to one of the lever handles, and a cutter blade connected to the other via a notch feed means,
In a pipe cutter in which a pair of lever handles are repeatedly opened and closed so as to cut and feed a cutter blade toward a pipe receiving portion so as to reach a biting state, the cutter feeding means includes a cutter blade. A driven tooth body having a plurality of receiving teeth integrally provided on the
A driving piece that can be engaged with the receiving teeth of the driven tooth body, and an engagement operation of the driving piece that can be engaged with the driven tooth body at a position before the driving piece is engaged with the driven tooth body. The driven tooth is fed to the driven tooth body by the engagement between the driving piece and the receiving tooth even after the reverse blocking piece is engaged with the last receiving tooth. An auxiliary receiving tooth is provided to engage with the reverse rotation preventing piece to assist the rotation.

That is, when both lever handles are repeatedly opened and closed, the driven piece feeds the driven tooth while engaging with each receiving tooth of the driven tooth one by one with each closing operation, while the reverse rotation is performed. The blocking piece also engages with the receiving teeth of the driven tooth body following the driving piece. Therefore, even when both lever handles are opened, the driven tooth body is reliably pitch-fed without being blocked by the reverse rotation preventing piece and returning.

However, since the reverse rotation preventing piece is positioned so as to be engaged with the driven tooth body at a stage before the driving piece, even after the reverse rotation preventing piece has been engaged with the last receiving tooth, the driving prevention piece is not driven. For the piece, the receiving teeth to be engaged still remain. Even in such a state, when the both lever handles are closed next, the reverse rotation preventing piece comes into engagement with the auxiliary receiving teeth provided on the driven tooth body, so that the driving piece eventually engages with the last receiving tooth. Until they come together, the feed of the driven tooth body is surely assisted.

[0010] In the driven tooth body, between the last receiving tooth and the auxiliary receiving tooth, the driving piece is supported by the auxiliary receiving tooth even if both lever handles are opened while the driving piece is engaged with the last receiving tooth. It is preferable to provide a configuration in which a tooth skipping portion that does not reach the surface is provided (claim 2). With this configuration, even if the lever handle is opened after the driving piece is engaged with the last receiving tooth, the driving piece only enters the idle feed state along the tooth jump portion. No body is sent more than necessary. This limits the bite state between the pipe receiving portion and the cutter blade to a predetermined range, which is useful in preventing a problem that the cutter blade penetrates from the pipe receiving portion.

The reverse rotation preventing piece has a stopper claw which can be engaged with the receiving tooth of the driven tooth body, and engages again with the last receiving tooth when the stopper claw shifts from the last receiving tooth to the tooth skipping portion. It is possible to adopt a configuration provided with an auxiliary claw that can be combined (claim 3). With this configuration, even when the required length of the tooth skipping portion provided between the last receiving tooth and the auxiliary receiving tooth in the driven tooth body is ensured, the engagement of the reverse rotation preventing piece with respect to the auxiliary receiving tooth is ensured. This is to ensure that the combination can be performed. That is, since the reverse rotation preventing piece engages the stopper claw with the receiving teeth and the auxiliary claw with the auxiliary receiving teeth, the space between these stopper claws and the auxiliary claw is widened. As a result, the tooth jump portion can be lengthened.

The pipe receiving portion may be provided with a pipe holder for holding the pipe at a predetermined angle with respect to the cutter blade. As a configuration of this pipe holder, the pipe holder has a pair of holding members that can be brought into contact with the outer peripheral surface of the pipe, one holding member is fixed to the pipe receiving portion, and the other holding member is the fixed side holding member. What is necessary is just to be able to swing in the direction of approaching / separating from the body and to be biased in the approaching direction by a spring (claim 5).

With this configuration, the pipe can be held in a stable and immovable state with respect to the pipe receiving portion. Therefore, even if a cutting load is applied to the pipe by the cutter blade, the pipe is displaced or shaken. , Inclination, etc. do not occur. Moreover, the distance between the two holding bodies when holding the pipe can be freely changed by a spring,
In addition to the advantage that general-purpose properties can be given to various pipes having different diameters, the advantage that the pipe can be attached to and detached from the pipe receiving portion with a single touch can be obtained.

Preferably, the pipe holder is provided only on one side of the pipe receiving portion. This makes it possible to prevent the pipe holder from interfering with the wall surface, for example, even when it is desired to cut the pipe protruding from the wall surface at the very edge of the wall surface.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a side view and a plan view showing one embodiment of a pipe cutter 1 according to the present invention. As is apparent from these figures, the pipe cutter 1 has a pair of lever handles 2 and 3 which are swingable in the opening and closing directions of each other, and a pipe receiving portion integrally extended with one of the lever handles 2. 5 and the other lever handle 3
And a cutter blade 7 connected via a notch feeding means 6 to the cutter blade 7.

The lever handle 2 on the side integrated with the pipe receiving portion 5 is formed with a slit 2a for inserting a cutter blade 7 at the center in the thickness direction, and the cutter blade 7 passes through the slit 2a. It is slidably held by a first pivot 10 that crosses. Further, a slit 5a that allows the cutter blade 7 to bite is also formed in the center of the pipe receiving portion 5 in the thickness direction (in both cases, see FIG. 3).

The pipe receiving portion 5 is formed to have a concave curve so as to be able to come into contact with the outer peripheral surface of the pipe P at two or more places, and has a hinge piece 12 protruding from its rear side. The other lever handle 3 is connected to the hinge piece 12 by a second pivot 13. A pipe holder 15 is provided on one side surface of the pipe receiving section 5. This pipe holder 15
Are plate-like portions 17a and 18 respectively bent in the shape of "ku".
a has a pair of holding bodies 17 and 18 provided with a.

In one of the holding members 17, a board portion 17b holding a plate-like portion 17a can be screwed to the pipe receiving portion 5 by two bolts 21 and 22. That is, this is the fixed side. In addition, the other holding body 18 is
A board portion 18b holding the base 8a is overlapped on the board portion 17b of the fixed-side holding body 17, and one of the bolts 22 is used for the swing axis and the other bolt 21 is used for a swing guide along the arc-shaped long hole 23. , And can be attached to the pipe receiving portion 5.

Therefore, the holding members 17 and 18 can swing in the direction of approaching / separating from each other (see FIG. 4). And, on the swingable side of the holding body 18, the swing shaft center bolt 2 is provided.
A spring 25 is hung on both the plate-like portion 18a and the swing guide bolt 21 with both leg ends locked. Therefore, the holding members 17 and 18 are urged in the mutually approaching direction, so that the pipe P can be stably held in the pipe receiving portion 5 at the time of cutting, and the pipe P after cutting is cut. The cut pieces can be held without falling. Further, the holding force for immobilizing the pipe P can be maintained to a certain extent,
Further, it can be used for pipes P having different diameters.

The pipe P may be attached or detached after the swingable holding member 18 has been swung in the opening direction by hand. In addition, the pipe P may be attached and detached between the opposing holding members 17 and 18. On the other hand, it is also possible to simply push or pull the pipe P along its radial direction. The above-mentioned notch feeding means 6
Is swingable by a driven tooth body 27 integrally provided on the base side of the cutter blade 7 and a second pivot 13 which is an interconnecting part of the lever handles 2 and 3 as shown in FIGS. Rotation prevention piece 28 held by the lever handle 3
And a driving piece 30 held swingably by a third pivot 29, and link means 32 connecting between the third pivot 29 and the cutter blade 7.

The reverse rotation preventing piece 28 is moved from the lever handle 3 to the driven tooth 27 by a spring 35 fitted on the second pivot 13.
The driving piece 30 is also urged from the lever handle 3 to the driven tooth body 27 by a spring 36 fitted on the third pivot 29. Therefore, when the lever handles 2 and 3 are within the predetermined opening angle range, both the reverse rotation preventing piece 28 and the driving piece 30 come into contact with the outer peripheral portion of the driven tooth body 27.

When the cutter blade 7 is moved closer to the pipe receiving portion 5 from the state shown in FIG.
However, the reverse rotation preventing piece 28 is driven by the driving piece 30 with respect to the driven tooth body 27.
Are positioned so that they come into contact at a stage prior to the contact position. In order to prevent the reverse rotation preventing piece 28 from falling down to the driven tooth body 27 side when the lever handles 2 and 3 are fully opened in the opening direction, the second rotation preventing piece 28 is provided with a second On the opposite side via the pivot 13, a swing limiting piece 37 that can abut on the lever handle 3 is provided in a protruding manner.

As shown in FIG. 9, the driving piece 30 is bent in a U-shaped cross section. A notch 38 is formed to avoid interference between 30 and link means 32. Also, lever handles 2,3
In order to prevent the driving piece 30 from falling down to the driven tooth body 27 side by the spring 36 when the driving pieces 30 are fully spread in the opening direction of each other, the projecting portion 3 with which the lower end of the driving wheel 30 abuts.
a is formed on the lever handle 3.

The driven tooth body 27 has a serrated receiving tooth 40.
Are provided in a line, and the receiving teeth 4
From the end of the 0 row to a position via the tooth jump portion 41 of a predetermined length,
Only two auxiliary receiving teeth 42 are provided. In contrast,
The driving piece 30 is provided with a feed claw 44 that can be sequentially engaged with each of the receiving teeth 40 of the driven tooth body 27.

An auxiliary claw 45 which can be engaged with the last receiving tooth 40 of the driven tooth body 27 is provided on the reverse rotation preventing piece 28,
A stopper claw 46 which can be sequentially engaged with each of the receiving teeth 40 and the auxiliary receiving teeth 42 is provided so as to be stepped with each other. In addition, the auxiliary pawl 45 is connected to the last receiving teeth 4.
Not only 0 but also each of the receiving teeth 40 and the auxiliary receiving teeth 42 may be engageable.

Next, a situation in which the pipe P is cut using the pipe cutter 1 will be described. After the pipe P is held by the pipe holder 5 and the pipe holder 15 as shown in FIG. 5, when the lever handles 2 and 3 are operated in the closing direction of each other, the first teeth 40 of the receiving teeth 40 of the driven tooth body 27 are moved. The feed pawl 44 of the drive piece 30 is engaged with the tooth, and the reverse rotation preventing piece 2 is fitted to the receiving tooth 40 at a stage earlier (lower side in FIG. 5).
In this state, the driving piece 30 feeds the driven tooth 27 one pitch.

By this feed, the stopper pawl 46 of the reverse rotation preventing piece 28 and the receiving tooth 40 of the driven tooth body 27 are once disengaged.
Immediately, the stopper pawl 46 is engaged with the next receiving tooth 40. When the lever handles 2 and 3 are opened while the stopper pawl 46 is engaged with the receiving teeth 40, the stopper pawl 46 prevents the driven tooth body 27 from returning backward, and only the feed pawl 44 of the driving piece 30 is moved to the next position. And the closing operation is performed again, whereby the driven tooth body 27 is fed by one pitch. By repeatedly opening and closing the lever handles 2 and 3 in this manner, the above operation is repeated, and the driven tooth body 27 is gradually fed.

When the lever handles 2 and 3 are closed after the reverse blocking piece 28 reaches the last receiving tooth 40 as shown in FIG. 10, the reverse rotation is caused by the feed of the driven tooth body 27 as shown in FIG. The stopper pawl 46 of the blocking piece 28 is
And the engagement with the receiving teeth 40 becomes impossible. However, at this time, the auxiliary pawl 45 of the reverse rotation preventing piece 28 is engaged with the last receiving tooth 40 of the driven tooth body 27 instead. Therefore, the backward movement of the driven tooth body 27 is still kept in the blocked state. Therefore, even in this state, even if a push-back action due to the cutting resistance of the pipe P occurs on the cutter blade 7, the feed of the cutter blade 7 is surely performed.

When the closing operation of the lever handles 2 and 3 is further continued, as shown in FIG. 12, the stopper pawl 46 of the reverse rotation preventing piece 28 passes through the tooth jump portion 41, and this time the driven tooth 27
Of the driven tooth 27, and the function of preventing the driven tooth body 27 from returning is continued. In this way, the cutter blade 7 approaches the pipe receiving portion 5 while cutting the pipe P, and reaches a biting state as shown in FIG.
The cutting of the pipe P is completed when the feed pawl 44 of the driving piece 30 engages with the last receiving tooth 40 of the driven tooth body 27.

In the state shown in FIG. 6, the cutting edge of the cutter blade 7 is completely housed in the pipe receiving portion 5, and this state is maintained when the pipe cutter 1 is not used. For this purpose, both handles may be closed by stoppers 50 provided near the ends of the lever handles 2 and 3. Even when the lever handles 2 and 3 are opened from the state shown in FIG. 6, the feed claw 44 of the driving piece 30 moves from the last receiving tooth 40 of the driven tooth body 27 to the tooth jumping part 41 as shown in FIG. It only moves idly and does not reach the auxiliary receiving teeth 42. Therefore, there is no problem that the cutting edge of the cutter blade 7 penetrates through the pipe receiving portion 5.

In order to continuously cut the pipe P, as shown in FIG. 8, the lever handles 2 and 3 are expanded beyond the normal opening operation range. Thereby, the link means 32
The cutter blade 7 is pulled away from the pipe receiving portion 5 through
Further, the driven tooth body 27 is returned to the initial state. By the way, the present invention is not limited to the above embodiment.

For example, in the pipe holder 15, the holding members 17, 18 are attached to the pipe receiving portion 5 by a screwing structure, and each time the pipe P is attached or detached, the screwing portion is operated to adjust the opening degree. You may. The pipe holders 15 may be provided on both side surfaces of the pipe receiving portion 5.

[0033]

As is apparent from the above description, claim 1
In the present invention described above, by repeatedly opening and closing the pair of lever handles, the cutter blade is notched and fed to the pipe receiving portion by the notch feeding means, and the pipes are brought close to each other so as to reach the biting state. In the cutter, the notch feed means includes a reverse rotation to assist the driven tooth body to be fed by the engagement between the driving piece and the receiving tooth even after the reverse rotation preventing piece is engaged with the last receiving tooth of the driven tooth body. Since the driven teeth are provided with the auxiliary receiving teeth that can be engaged with the blocking pieces, the feeding of the driven teeth is reliably supported to the end. Therefore, even if a push-back action due to the cutting resistance of the pipe occurs on the cutter blade, the feed of the cutter blade is reliably performed, and the pipe can be completely cut to the end.

In the driven tooth body, if a tooth skip portion is provided between the last receiving tooth and the auxiliary receiving tooth (Claim 2), both lever handles after the driving piece is engaged with the last receiving tooth. Even if the opening operation is performed, the driven piece does not engage with the auxiliary receiving teeth, so that the driven tooth body is not sent more than necessary. That is, the bite state between the pipe receiving portion and the cutter blade is limited to a predetermined range, which is useful in preventing a problem that the cutter blade penetrates from the pipe receiving portion.

If the stopper pawl and the auxiliary pawl are provided for the reverse rotation preventing piece (claim 3), the required length of the tooth jump portion provided on the driven tooth body can be secured. . That is, the structural feasibility is improved. If a pipe holder having a pair of holding bodies urged in the mutually approaching direction by a spring is provided for the pipe receiving portion (claims 4 and 5), the pipe can be held in a stable immovable state. Therefore, reliable cutting without displacement, blurring, inclination, etc. can be performed. Therefore, the cut end of the cut pipe can be obtained in a positionally accurate, clean, and perpendicular to the pipe axis. In addition, the versatility of various pipes having different diameters can be expanded, and the pipe can be attached and detached with a single touch.

If the pipe holder is provided only on one side of the pipe receiving portion (claim 6), it is possible to prevent interference with the surroundings of the pipe and to facilitate the work.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a pipe cutter according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view showing a state in which a pipe holder is disassembled with respect to a lever handle integrated with a pipe receiving portion.

FIG. 4 is a diagram illustrating a holding state of a pipe with respect to a pipe holder.

FIG. 5 is a side sectional view corresponding to FIG.

FIG. 6 is a side sectional view showing the next operation stage of FIG. 12;

FIG. 7 is a side sectional view showing the next operation stage of FIG. 6;

FIG. 8 is a side sectional view showing the next operation stage of FIG. 7;

FIG. 9 is an enlarged sectional view taken along line AA of FIG. 7;

FIG. 10 is an enlarged view of a main part showing a next operation stage of FIG. 5;

FIG. 11 is an enlarged view of a main part showing a next operation stage of FIG. 10;

FIG. 12 is an enlarged view of a main part showing a next operation stage of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe cutter 2 Lever handle 3 Lever handle 5 Pipe receiving part 6 Notch feeding means 7 Cutter blade 15 Pipe holder 17 Nipping body 18 Nipping body 25 Spring 27 Follower tooth body 28 Reverse rotation prevention piece 30 Drive piece 40 Receiving tooth 41 Tooth jump part 42 Auxiliary receiving teeth 45 Auxiliary claws 46 Stopper claws P Pipe

Claims (6)

(57) [Claims] 1. A pair of lever handles (2, 3), a pipe receiving portion (5) extending to one of the lever handles (2, 3), and a notch feed means (6) to the other. A cutter blade (7) connected thereto, and by repeatedly opening and closing the pair of lever handles (2, 3), the cutter blade (7) is notched and fed to the pipe receiving portion (5) to be close to the pipe receiving portion (5); In the pipe cutter adapted to reach the biting state of each other, the notch feeding means (6) includes a driven tooth body (2) having a plurality of receiving teeth (40) integrally provided on a cutter blade (7).
7), a driving piece (30) engageable with the receiving teeth (40) of the driven tooth body (27), and the driving piece (30) is provided with the driven tooth body (2).
7) a reverse rotation preventing piece (28) that can be engaged with the driven tooth body (27) at a position before engaging with the driven tooth (27) and that follows the engaging operation of the driving piece (30) in a timely manner. Even after the reverse rotation preventing piece (28) is engaged with the last receiving tooth (40), the driven tooth (27) is driven by the engagement of the driving piece (30) and the receiving tooth (40). A pipe cutter, characterized in that it is provided with an auxiliary receiving tooth (42) which engages with a reversing blocking piece (28) to assist in feeding the body (27). 2. A driving piece (30) is engaged with the last receiving tooth (40) between the last receiving tooth (40) and the auxiliary receiving tooth (42) in the driven tooth body (27). The tooth jumping portion (41) is provided such that the driving piece (30) does not reach the auxiliary receiving teeth (42) even when the lever handles (2, 3) are opened and operated in the depressed state. Item 4. The pipe cutter according to Item 1. 3. A stopper pawl (4) engageable with the receiving teeth (40) of the driven tooth body (27) is provided on the reverse rotation preventing piece (28).
6) and the auxiliary pawl (45) which can be engaged with the last receiving tooth (40) again when the stopper pawl (46) shifts from the last receiving tooth (40) to the tooth skipping portion (41). 3. The pipe cutter according to claim 2, further comprising: 4. The pipe receiving part (5) is provided with a pipe holder (15) for holding the pipe (P) at a predetermined angle with respect to the cutter blade (7). The pipe cutter according to claim 1. 5. The pipe holder (15) includes a pair of holding members (17, 1) that can contact an outer peripheral surface of the pipe (P).
8), and one holding body (17) is fixed to the pipe receiving portion (5), and the other holding body (18) moves in the direction of approaching / separating from the fixed-side holding body (17). 5. The pipe cutter according to claim 4, wherein the pipe cutter is swingable and is urged in the approaching direction by a spring. 6. The pipe cutter according to claim 4, wherein the pipe holder is provided only on one side of the pipe receiving portion.