JPH09215875A - Pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely cut a cutting part of pipe at a correct position, with favorable appearance, and perpendiculary to a pipe axis to the last by operating both lever handles repeatedly to be opened/closed to feed receiving teeth in a follower tooth body by a drive member for engaging an inverse rotation prohibiting member with the receiving teeth by interlock. SOLUTION: A pipe P is held on a pipe holding part 5 and a pipe holder 15, and lever handles 2, 3 are operated in closing directions to each other. A feed pawl 44 of a drive member 30 is engaged with a first tooth of receiving teeth 40 in a follower tooth body 27. Simultaneously, a stopper pawl 46 of an inverse rotation prohibiting member 28 is engaged with the receiving teeth 40 more on the upper and lower side, in a drawing, than that by several stages. The follower tooth body 27 is thus fed for one pitch. For next opening operation of the lever handles 2, 3, inverse return of the follower tooth body 27 is prohibited by the stopper pawl 46, and its position is kept. By next closing operation, it is fed for one pitch again. A cutter blade 7 correctly cuts the pipe P by this repetition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutter that can be used for cutting resin pipes and the like.

[0002]

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

[0003]

When the cutting amount of the cutter blade increases in the process of cutting the pipe, the cut surface of the pipe comes into strong pressure contact with both side surfaces of the cutter blade (commonly known 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 at the blade tip. Will work. Then, such an action reaches a peak at a predetermined time when the uncut portion of the pipe is reduced.

For this reason, when both lever handles are operated once in the closing direction in order to operate the pitch feed means by one pitch, and then both lever handles are operated in the opening direction, the opening operation is accompanied. In some cases, the cutter blade and the slicing means are pushed back to form a blank feed shape, and the cutter blade returns to the state before once. That is, no matter how many times the lever handles are opened and closed, the cutter blade only repeats advancing and retreating, and the pipe cannot be cut to the end.

On the other hand, in the conventional pipe cutter, since the pipe receiving portion is formed only with the 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,
The pipes are relatively easily displaced, shaken, tilted, etc., and this may cause displacement of the cut, rattling, diagonal cutting, etc.

The present invention has been made in view of the above circumstances, and ensures that the cutting of the pipe can be reliably performed to the end, and that the cut end of the pipe is positionally accurate, clean, and relative to the pipe axis. The purpose of the present invention is to provide a manual pipe cutter that can be obtained in an orthogonal form.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is, in the present invention according to claim 1, a pair of lever handles, a pipe receiving portion extended to one of the lever handles, and a cutter blade connected to the other via a notch feed means are provided.
In a pipe cutter in which a pair of lever handles are repeatedly opened and closed to chop and feed the cutter blades toward the pipe receiving portion so as to reach each other's bite state, the chopping feed means is a cutter blade. A driven toothed body having a plurality of tooth receiving teeth integrally provided in
A driving piece engageable with a tooth receiving portion of the driven tooth and an engaging operation of the driving piece which is engageable with the driven tooth at a position before the driving piece engages the driven tooth. The driven tooth body is driven by the driven tooth due to the engagement between the drive piece and the tooth after the reverse tooth block is engaged with the last tooth. It is characterized in that an auxiliary tooth is provided which engages with the reverse rotation preventing piece in order to assist the removal.

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

However, since the reverse rotation preventing piece is positioned so as to be engaged with the driven tooth at a stage before the driving piece, the reverse rotation preventing piece is driven even after the last rotation receiving tooth is engaged with the driven tooth body. This means that the tooth still has teeth to be engaged. Even in such a state, when the lever handles are closed next time, the reverse rotation preventing piece comes to engage with the auxiliary tooth receiving provided on the driven tooth body, so that the driving piece is finally engaged with the last tooth receiving. The feed of the driven tooth body is surely assisted until it comes into agreement.

In the driven tooth body, between the last tooth receiving member and the auxiliary tooth receiving member, even if both lever handles are opened and operated while the driving piece is engaged with the last tooth receiving member, the driving piece receives the auxiliary tooth receiving member. It is preferable to have a structure in which a tooth jumping portion that does not reach the position is provided (Claim 2). With this configuration, even if the lever handle is opened after the drive piece is engaged with the last tooth receiving tooth, the drive piece only idles along the tooth jump portion. The body is never sent unnecessarily. This limits the biting state between the pipe receiving portion and the cutter blade within a predetermined range, which is useful in preventing the problem that the cutter blade penetrates through the pipe receiving portion.

The reverse rotation preventing piece has a stopper claw engageable with the tooth receiving member of the driven tooth and an engaging member for the last tooth receiving member when the stopper claw moves from the last tooth receiving portion to the tooth jumping portion. The auxiliary claw which can be combined can be provided (Claim 3). With this configuration, even when the required length of the tooth jump portion provided between the last tooth and the auxiliary tooth in the driven tooth body is secured to the required amount, the engagement of the reversal prevention piece with respect to the auxiliary tooth is This is to ensure that the match can be performed. That is, since the reverse rotation preventing piece engages the stopper pawl with respect to the tooth reception and the auxiliary pawl with respect to the auxiliary tooth reception, respectively, the space between the stopper pawl and the auxiliary pawl is widened. As a result, the tooth jump portion can be made longer.

The pipe holder may be provided with a pipe holder for holding the pipe at a predetermined angle with respect to the cutter blade (claim 4). The structure of this pipe holder has a pair of clamps capable of contacting the outer peripheral surface of the pipe, one clamp being fixed to the pipe receiving portion, and the other clamp being the fixed side clamp. It may be swingable in the direction of approaching or separating from the body and may be biased in the direction of approaching by a spring (claim 5).

With such a structure, the pipe can be held in a stable and immovable state with respect to the pipe receiving portion, so that even if the cutting load of the cutter blade acts on the pipe, the pipe is displaced or shaken. , Tilting etc. does not occur. Moreover, the distance between the two holding bodies when holding the pipe can be freely changed by the spring,
Not only is there an advantage that versatility can be imparted to various pipes having different diameters, but also the advantage that the pipe can be attached to and detached from the pipe receiving portion with one touch.

The pipe holder is preferably provided only on one side of the pipe receiving portion (claim 6). This makes it possible to prevent a problem in which the pipe holder interferes with the wall surface even when it is desired to cut the pipe protruding from the wall surface at the 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 an embodiment of a pipe cutter 1 according to the present invention. As is clear from these figures, the pipe cutter 1 includes a pair of lever handles 2 and 3 which are swingable in the opening and closing directions, and a pipe receiving portion integrally extended to one lever handle 2. 5 and the other lever handle 3
And a cutter blade 7 connected via the slicing means 6.

The lever handle 2 on the side integrated with the pipe receiving portion 5 is formed with a slit 2a at the central portion in the thickness direction thereof, into which the cutter blade 7 is inserted. It is swingably held by a first pivot 10 that traverses. Further, a slit 5a that allows the cutter blade 7 to bite is also formed in the central portion of the pipe receiving portion 5 in the thickness direction (see FIG. 3 for both).

The pipe receiving portion 5 is formed with a concave curve so that it can contact the outer peripheral surface of the pipe P at two or more places, and a hinge piece portion 12 is projectingly provided on the rear side thereof. The other lever handle 3 is connected to the hinge piece 12 by the second pivot 13. A pipe holder 15 is provided on one side surface of the pipe receiving portion 5. This pipe holder 15
Are the plate-like portions 17a and 18 bent in a "U" shape, respectively.
It has a pair of holding bodies 17 and 18 provided with a.

In one holding body 17, a base plate portion 17b holding a plate-shaped portion 17a can be screwed to the pipe receiving portion 5 by two bolts 21 and 22. That is, this is the fixed side. Further, the other holding body 18 is the plate-shaped portion 1
A base plate portion 18b for holding 8a is superposed on the base plate portion 17b of the fixed side holding body 17, and one bolt 22 is used for the pivot axis, and the other bolt 21 is used for the pivot guide along the arcuate elongated hole 23. Is attached to the pipe receiving portion 5.

Therefore, the holding bodies 17 and 18 can be swung in the approaching and separating directions (see FIG. 4). Further, the swing shaft center bolt 2 is attached to the sandwiching body 18 on the swingable side.
2, the spring 25 is hooked on the plate-shaped portion 18a and the swing guide bolt 21 in a state where both leg ends are locked. Therefore, the holding bodies 17 and 18 are urged toward each other, and the pipe P can be stably held in the pipe receiving portion 5 at the time of cutting, and the pipe P after cutting can be retained. It is also possible to hold the cut pieces without dropping them. Also, the holding force for immobilizing the pipe P can be maintained to some extent firmly,
Further, it is possible to provide general versatility for pipes P having different diameters.

The pipe P may be attached / detached after the gripping body 18 on the swingable side is manually rocked in the opening direction, but in addition to this, between the two gripping bodies 17 and 18 facing each other. On the other hand, it is possible to just push the pipe P along the radial direction or pull it out. The above-mentioned step feed means 6
Is swingable by a driven tooth 27 integrally provided on the base side of the cutter blade 7 as shown in FIGS. 5 to 8 and a second pivot 13 which is an interconnecting portion of the lever handles 2 and 3. And the lever handle 3
On the other hand, it has a driving piece 30 which is swingably held by a third pivot 29, and a link means 32 which connects 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 the spring 35 fitted to the second pivot 13.
The drive piece 30 is also urged from the lever handle 3 toward the driven tooth 27 by the spring 36 fitted to 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 27.

When the cutter blade 7 is brought closer to the pipe receiving portion 5 from the state shown in FIG. 5, the driven tooth 27 is moved to the first pivot 1
Although it will move from the bottom to the top with 0 as the center, the reverse rotation prevention piece 28 moves the drive piece 30 with respect to the driven tooth 27.
The position is such that the contact is made at a stage before the contact position. In order to prevent the reverse rotation preventing piece 28 from lying sideways to the driven tooth 27 side when the lever handles 2 and 3 are fully expanded in the mutual opening direction, On the opposite side of the pivot 13, a swing limiting piece 37 that can come into contact with the lever handle 3 is projected.

As shown in FIG. 9, the driving piece 30 is bent in a U-shaped cross section, and the driving piece 30 is formed on the upper surface of the driving piece 30 as the cutter blade 7 approaches the pipe receiving portion 5. A notch 38 is formed to avoid interference between 30 and the link means 32. Also, the lever handle 2, 3
In order to prevent the drive piece 30 from lying sideways toward the driven tooth 27 side by the spring 36 when the drive wheels 30 are fully opened in the opening direction, the protrusion 3 with which the lower end portion of the drive wheel 30 abuts.
A is formed on the lever handle 3.

The driven tooth 27 has a toothed tooth 40 in a sawtooth shape.
Is provided in a line and a plurality of teeth 4
From the row end of 0 to the position via the tooth jump portion 41 of a predetermined length,
Only two auxiliary teeth 42 are provided. In contrast,
The drive piece 30 is provided with a feed pawl 44 that is sequentially engageable with each tooth 40 of the driven tooth 27.

Further, the reverse rotation preventing piece 28 is provided with an auxiliary pawl 45 which can be engaged with the last tooth 40 of the driven tooth 27,
Stopper pawls 46 that can be sequentially engaged with the tooth receiving teeth 40 and the auxiliary tooth receiving teeth 42 are provided so as to have a step shape with respect to each other. In addition, the auxiliary claw 45 is the last tooth 4
Not only 0 but also each tooth 40 and auxiliary tooth 42 may be engageable.

Next, a situation where the pipe P is cut by using the pipe cutter 1 will be described. As shown in FIG. 5, after holding the pipe P with respect to the pipe holding portion 5 and the pipe holder 15, when the lever handles 2 and 3 are operated in the closing direction of each other, the first tooth receiving 40 of the driven tooth 27 is moved. The feed claw 44 of the driving piece 30 is engaged with the tooth, and the reverse rotation preventing piece 2 is attached to the tooth receiving 40 at a stage (lower side in FIG. 5) a few steps before that.
The stopper claw 46 of No. 8 is engaged, and in this state, the driving piece 30 feeds the driven tooth 27 by one pitch.

By this feeding, the stopper claw 46 of the reverse rotation prevention piece 28 and the tooth 40 of the driven tooth 27 are disengaged once,
Immediately, the stopper claw 46 comes into engagement with the next tooth 40. When the lever handles 2 and 3 are opened while the stopper claw 46 is engaged with the tooth receiving member 40, the stopper claw 46 prevents the driven tooth 27 from returning, and only the feed claw 44 of the driving piece 30 is moved to the next position. The driven tooth 27 is fed by one pitch by engaging with the tooth receiving member 40 and closing again. In this way, by repeatedly opening and closing the lever handles 2 and 3, the above-described operation is repeated, and therefore the driven tooth 27 is gradually fed.

As shown in FIG. 10, when the reverse rotation preventing piece 28 reaches the last tooth 40 and the lever handles 2 and 3 are closed, the reverse rotation is accompanied by the feed of the driven tooth 27 as shown in FIG. The stopper claw 46 of the blocking piece 28 is the driven tooth 27.
The state corresponding to the tooth jumping portion 41 becomes, and the engagement with the receiving tooth 40 becomes impossible. However, at this time, the auxiliary claw 45 of the reverse rotation blocking piece 28 instead engages with the last tooth 40 of the driven tooth 27. Therefore, the backward movement of the driven tooth 27 is still prevented. Therefore, in this state, even if the push-back action due to the cutting resistance of the pipe P occurs on the cutter blade 7, the cutter blade 7 is reliably fed.

When the closing operation of the lever handles 2 and 3 is further continued, as shown in FIG. 12, the stopper claw 46 of the reverse rotation preventing piece 28 passes through the tooth jumping portion 41 and, in turn, the driven tooth 27.
The auxiliary tooth receiving portion 42 of FIG. In this way, the cutter blade 7 approaches the pipe receiving portion 5 while cutting the pipe P, and reaches the bite state as shown in FIG.
The cutting of the pipe P is completed when the feed claw 44 of the driving piece 30 is engaged with the last tooth 40 of the driven tooth 27.

In the state shown in FIG. 6, the cutting edge of the cutter blade 7 is completely accommodated in the pipe receiving portion 5, so that this state should be maintained when the pipe cutter 1 is not used. For this purpose, both handles may be closed by a stopper 50 provided near the ends of the lever handles 2 and 3. Even if the lever handles 2 and 3 are opened from the state of FIG. 6, the feed claw 44 of the drive piece 30 moves from the last tooth 40 of the driven tooth 27 along the tooth jump 41 as shown in FIG. It only moves idly and does not reach the auxiliary tooth receiving 42. Therefore, the problem that the cutting edge of the cutter blade 7 penetrates the pipe receiving portion 5 does not occur.

In order to continuously cut the pipe P, the lever handles 2 and 3 are suddenly expanded beyond the normal opening operation range as shown in FIG. Thereby, the link means 32
The cutter blade 7 is separated from the pipe receiving portion 5 via
Further, the driven tooth 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 bodies 17 and 18 are attached to the pipe receiving portion 5 by a screwing structure, and the screwing portion is operated every time the pipe P is attached or detached to adjust the opening degree. May be. Further, the pipe holder 15 may be provided on both side surface portions of the pipe receiving portion 5.

[0033]

As is apparent from the above description, claim 1
In the present invention described, by repeatedly opening and closing the pair of lever handles, the cutter blade is scribe-feeded to the pipe receiving portion by the scribe-feeding means so that the cutter blades come close to each other, and the pipes reach each other's bite state. In the cutter, in the above-mentioned step feed means, even after the reverse rotation inhibiting piece is engaged with the last tooth receiving portion of the driven tooth body, the reciprocating tooth is rotated to assist the feeding of the driven tooth body by the engagement of the driving piece and the tooth receiving portion Since the driven tooth body is provided with the auxiliary tooth which can be engaged with the blocking piece, the feeding of the driven tooth body is surely assisted to the end. Therefore, even if the pushing back action due to the cutting resistance of the pipe is generated on the cutter blade, the feeding 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 jump portion is provided between the last tooth and the auxiliary tooth (Claim 2), both lever handles after the drive piece is engaged with the last tooth. Even if the drive tooth is opened, the drive piece will not engage with the auxiliary tooth reception, so that the driven tooth body will not be fed more than necessary. That is, the biting state between the pipe receiving portion and the cutter blade is limited to a predetermined range, which is useful in preventing the problem that the cutter blade penetrates from the pipe receiving portion.

If the stopper claw and the auxiliary claw are provided for the reverse rotation preventing piece (claim 3), it is possible to secure the necessary length of the tooth jumping portion provided on the driven tooth body. . That is, it enhances the structural feasibility. If the pipe holder is provided with a pair of holders that are urged in the direction of mutual proximity by a spring (claims 4 and 5), the pipe can be held in a stable and immovable state. Therefore, it is possible to perform reliable cutting without misalignment, blurring, tilting, or the like. Therefore, the cut end of the cut pipe can be obtained in a positionally accurate, clean, and orthogonal form to the pipe axis. Further, the versatility of various pipes having different diameters can be expanded, and the pipes can be attached and detached with one touch.

If the pipe holder is provided only on one side of the pipe receiving portion (claim 6), interference with the periphery of the pipe can be prevented, and the work can be facilitated.

[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 lever holder on a side integrated with a pipe receiving portion in a state in which a pipe holder is disassembled.

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 sectional side view showing a next operation step of FIG. 12;

FIG. 7 is a side sectional view showing the next operating step of FIG. 6;

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

9 is an enlarged cross-sectional view taken along the line AA of FIG.

10 is an enlarged view of an essential part showing the next operation step of FIG. 5;

11 is an enlarged view of an essential part showing a next operation step of FIG.

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

[Explanation of Codes] 1 Pipe Cutter 2 Lever Handle 3 Lever Handle 5 Pipe Receiving Part 6 Slit Feeding Means 7 Cutter Blade 15 Pipe Holder 17 Clamping Body 18 Clamping Body 25 Spring 27 Driven Tooth Body 28 Reverse Rotation Blocking Piece 30 Driving Piece 40 Tooth Bearing 41 tooth jump part 42 auxiliary tooth 45 auxiliary claw 46 stopper claw P pipe

Claims (6)

[Claims] 1. A pair of lever handles (2, 3), a pipe receiving part (5) extending to one of the lever handles (2, 3), and a knurling means (6) on the other side. With the cutter blade (7) connected, the cutter blade (7) is sent to the pipe receiving portion (5) by repeatedly opening and closing the pair of lever handles (2, 3) to bring it closer to the pipe receiving portion (5), In the pipe cutter adapted to reach each other's bite state, the notch feed means (6) has a driven tooth body (2) having a plurality of receiving teeth (40) integrally provided on the cutter blade (7).
7), a driving piece (30) engageable with the tooth receiving (40) of the driven tooth body (27), and the driving piece (30) includes the driven tooth body (2).
7) has a reverse rotation preventing piece (28) which is engageable with the driven tooth (27) at a position before engaging with the drive piece (30) and follows the engaging operation of the driving piece (30) in timing. The driven tooth body (27) is driven by the engagement between the drive piece (30) and the tooth (40) even after the reverse rotation preventing piece (28) is engaged with the last tooth (40). Pipe cutter, characterized in that it is provided with auxiliary toothing (42) which engages the reverse blocking piece (28) to assist in the feeding of the body (27). 2. A driven piece (30) is engaged with the last tooth (40) between the last tooth (40) and the auxiliary 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 tooth receiving (42) even if the lever handle (2, 3) is opened and operated in the state of being. Item 1. The pipe cutter according to item 1. 3. The stopper claw (4) engageable with the tooth receiving (40) of the driven tooth (27) on the reverse rotation preventing piece (28).
6) and an auxiliary claw (45) that can be engaged again with the last tooth (40) when the stopper claw (46) moves from the last tooth (40) to the tooth jump (41). ) And are provided, The pipe cutter of Claim 2 characterized by the above-mentioned. 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 any one of claims 1 to 3. 5. The pipe holder (15) comprises a pair of holding bodies (17, 1) capable of contacting the outer peripheral surface of the pipe (P).
8), one holding body (17) is fixed to the pipe receiving portion (5), and the other holding body (18) is in the direction of approaching and separating from the fixed side holding body (17). The pipe cutter according to claim 4, wherein the pipe cutter is swingable and is biased in a proximity direction by a spring (25). 6. The pipe cutter according to claim 4, wherein the pipe holder (15) is provided only on one side of the pipe receiving portion (5).