JP2820357B2 - 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 manually operated pipe cutter for cutting a pipe made of synthetic resin such as vinyl chloride resin.

[0002]

2. Description of the Related Art A hook-shaped blade receiver is coupled to the tip of an upper handle, and a gear plate is coupled to a rear end of a blade plate provided to be openable and closable with the blade receiver. A plurality of ratchet teeth are provided at equal intervals on an arcuate edge formed on the outer periphery, and a spring for deflecting a lower handle, the tip of which is rotatably connected to the blade receiver, to an open position, is provided on the lower handle. Pipe cutters with ratchet pawls that can engage teeth are known in the art.

[0003] In the above-mentioned pipe cutter, a ratchet pawl is engaged with ratchet teeth by repeating the operation of grasping the upper handle and the lower handle, thereby closing the blade plate in a stepwise manner. The pipes supported by are cut off.

After the pipe is cut, the upper handle and the lower handle, which are opened at a predetermined angle, are relatively opened to return the blade plate to the open position.

[0005]

In the above-mentioned pipe cutter, the mechanism for returning the blade plate to the open position connects the lower handle and the gear plate by a two-foldable link that can be folded in half, and the lower handle is connected to the upper handle. 2 by opening
Since the blade plate is returned to the open position via the contact link, the opening angle of the upper and lower handles when the blade plate is opened is extremely large, and when trying to cut the next pipe, the upper and lower There is a problem that it is difficult to hold the handle with one hand.

An object of the present invention is to solve the above-mentioned conventional problems and to reduce the opening angles of the upper and lower handles in the gap where the blade plate is returned to the open position.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a blade plate attached to a tip end of an upper handle is used as a blade receiver by repeating an operation of gripping an upper handle and a lower handle. In a pipe cutter which is closed stepwise, one end of an arm is rotatably connected to an upper handle, and the middle of the arm and a lower handle are connected by a two-way link, and the other end of the arm is connected. Is provided with an engaging element, and has a configuration in which a concave arc shape is formed on one side of the outer periphery of the gear plate connected to the rear end of the blade plate so that the engaging element is engaged.

[0008]

According to the present invention having the above-described structure,
When the lower handle is opened with respect to the upper handle while the blade plate is closed, the arm is pulled through the two tangent links, and the engaging element provided at the other end of the arm presses the arc of the gear plate. Therefore, the blade plate rotates, and the blade plate can be returned to the open position.

[0009]

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

As shown in FIGS. 1 and 2, a hook-shaped blade receiver 2 is coupled to the tip of the upper handle 1, and a groove 3 is provided from the back surface of the blade receiver 2 to the rear end of the upper handle 1. Have been. An insertion groove 4 having a width smaller than that of the groove 3 is formed from the tip of the blade receiver 2 to the tip of the upper handle 1.

Lower handle 5 opposed to upper handle 1
Has a protruding piece 6 at the tip, and the protruding piece 6 is inserted into the groove 3 on the back surface of the blade receiver 2 and is rotatably connected to the blade receiver 2 via a pin 7. A groove 8 is provided on a surface of the lower handle 5 facing the upper handle 1.

A spring 9 is attached to the pin 7, and the lower handle 5 is pressed by the spring 9 in a direction away from the upper handle 1.

A blade plate 10 is inserted into an insertion groove 4 provided at the distal end of the upper handle 1. The blade plate 10 is supported rotatably about a pin 11 attached to the distal end of the upper handle 1, and can be opened and closed with respect to the blade receiver 2.

A gear plate 1 is provided at the rear end of the blade plate 10.
2 are coupled, and a pin 11
Is formed at the center. Arcuate edge 13
Are provided with a plurality of ratchet teeth 14 at equal intervals. A concave arcuate surface 15 is formed on one side of the outer periphery of the gear plate 12. Further, the gear plate 12
Is provided with a stop pin 16, which can be engaged with the bottom surface 3 a of the groove 3 of the blade receiver 2, and the engagement of the stop pin 16 with the bottom surface 3 a further causes the blade plate 10 in an open state to be further opened. Opening is prevented.

A ratchet pawl 17 is incorporated in the groove 8 at the distal end of the lower handle 5, and the ratchet pawl 1
7 is rotatably supported by the lower handle 5 via a pin 18.

The ratchet pawl 17 has a projecting piece 19 at the rear end, and the spring 20 supported by the pin 18 comes into contact with a stopper pin 21 provided at the tip of the lower handle 5. The ratchet pawl 17 is deflected in the direction.

An arm 22 is incorporated in the groove 3 at the distal end of the upper handle 1, and one end of the arm 22 is rotatably connected to the upper handle 1 via a pin 23.

One end of a tangent link 24 is connected to the middle of the arm 22 via a pin 25.
Is connected to the distal end of the lower handle 5 via a pin 26.

Here, the two-contact link 24 is formed by connecting the ends of two links 24a and 24b so as to be freely bent by a pin 26. One end of one link 24b is provided with an opening stopper pin 27. An inclined edge 28 is provided at an end of the other link 24a to hold the two-contact link 24 in a substantially linearly expanded state by engagement with the opening stopper pin 27.
Is provided.

The other end of the arm 22 is provided with an engaging element 2 engageable with the arcuate surface 15 of the gear plate 12.
9 are attached.

Now, as shown in FIG. 3, when the pipe A is placed on the blade receiver 2 and the upper handle 1 and the lower handle 5 are gripped, the ratchet pawl 17 is brought into contact with the ratchet teeth 14 of the gear plate 12.
, The gear plate 12 rotates about the pin 11, and the blade plate 10 swings toward the blade receiver 2.

At this time, the tangent link 24 pushes up the arm 22, and when the arm 22 contacts the inner surface of the upper handle 1, the tangent link 24 bends from the center,
The arm 22 is pulled down. For this reason, the engagement element 29 at the other end of the arm 22 separates from the arcuate surface 15 of the gear plate 12 and then approaches and contacts the arcuate surface 15, so that the rotation of the gear plate 12 is not prevented.

When the grip between the upper handle 1 and the lower handle 5 is released, the lower handle 5 rotates in a direction away from the upper handle 1 by the elasticity of the spring 9. At this time, 2
Since the tangent link 24 is pulled, the tangent link 24 is developed linearly, and the ratchet pawl 17 is
Move away from 4.

By repeating the operation of grasping the upper handle 1 and the lower handle 5, the blade plate 10 is closed stepwise toward the blade receiver 2, and the pipe A supported by the blade receiver 2 is cut as shown in FIG. And finally cut the pipe A.

FIG. 2 shows a state at the time of cutting the pipe.
Numeral 0 enters the insertion groove 4 of the blade receiver 2 and is in a fully-closed state. The engaging element 29 at the other end of the arm 22 is engaged with the arcuate surface 15 so that the arm 22 is pushed up. .

In the above-described cutting state, the elasticity of the spring 9 for deflecting the lower handle 5 to the open position causes
The engaging element 29 presses the arcuate surface 15, but the pressing alone does not return the blade plate 10 to the open position.

To return the blade plate 10 to the open position, the lower handle 5 is opened with respect to the upper handle 1 from the state shown in FIG. With the release, the tangent link 24 becomes the arm 22
The arm 22 pivots about the pin 23 toward the lower handle 5, and the engaging element 29 presses the arcuate surface 15 of the gear plate 12.

For this reason, the gear plate 12 rotates about the pin 11, and when the stop pin 16 of the gear plate 12 comes into contact with the bottom surface 3 a of the groove 3 of the blade receiver 2, the gear plate 12 is rotated.
Cannot be rotated, and as shown in FIG.
0 is open, and the upper and lower handles 1, 5 are also open.

As described above, the engagement plate 29 provided at the other end of the arm 22 presses the arcuate surface 15 of the gear plate 12 to open the blade plate 10, so that the gear plate 12 and the lower handle are opened. The opening angle of the upper and lower handles 1 and 5 is smaller than that of the conventional pipe cutter in which the upper and lower handles 1 and 5 are directly connected by the two-link 24. You can hold.

As shown in the drawing, when pin insertion grooves 4a through which the stopping pins 16 can be inserted are provided on both sides of the insertion groove 4 of the blade receiver 2, the pins 11 supporting the blade plate 10 are pulled out, and the blade plate 1 is pulled out.
The blade plate 10 can be removed by pulling the blade plate 10 toward the front side of the upper handle 1 by aligning the stop pin 16 with the pin insertion groove 4a by moving the blade plate 0, and thus the blade plate 10 can be easily replaced.

[0031]

As described above, in the pipe cutter according to the present invention, one end of the arm is connected to the upper handle, the middle of the arm and the lower handle are connected by the two-link, and the lower handle with respect to the upper handle is connected. When the handle is opened, the arm is pulled down via the tangent link, and the engaging member provided at the other end of the arm presses the arcuate surface of the gear plate to return the blade plate to the open position. The opening angle of the upper and lower handles when the plate is fully closed is small, so that when cutting the next pipe, the upper and lower handles can be gripped with one hand, and the pipe cutting operation can be performed efficiently.

[Brief description of the drawings]

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

FIG. 2 is a partially cutaway front view of the above.

FIG. 3 is a partially cutaway front view showing a state at the start of pipe cutting.

FIG. 4 is a partially cutaway front view showing a pipe being cut;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper handle 2 Blade holder 5 Lower handle 10 Blade plate 12 Gear plate 13 Arc-shaped edge 14 Ratchet tooth 15 Arc-shaped surface 17 Ratchet claw 22 Arm 24 2 tangential link 29 Engagement element

Claims (1)

(57) [Claims] 1. A hook-shaped blade receiver is coupled to the tip of an upper handle, and a gear plate is coupled to a rear end of a blade plate provided to be openable and closable with the blade receiver. A plurality of ratchet teeth are provided at equal intervals on the arcuate edge, and a lower handle whose tip is rotatably connected to the blade receiver is provided with a ratchet claw that can be engaged with the ratchet teeth. In a pipe cutter in which the ratchet claw is engaged with the ratchet teeth by repeating the operation of grasping to close the blade plate stepwise, and the blade plate is returned to the open position by the relative opening of the upper handle and the lower handle, A mechanism for returning the blade plate to the open position, the arm including an arm having one end rotatably connected to the upper handle, and a two-contact link connecting a middle of the arm and a distal end of the lower handle; Attach the engaging element to the other end of the A pipe cutter characterized in that a concave arcuate surface is formed on one side of the outer periphery of the gear plate with which the engaging element engages.