JPS5920876Y2 - Cut opening mechanism in pipe cutter - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cutting port opening mechanism for a pipe cutter that can easily perform continuous cutting of small diameter pipes such as hard vinyl chloride pipes with one hand operation. The details are as follows.

A cutting blade plate facing the pipe receiving recess 1 is rotatably pivoted to the right shoulder part 2 of a handle main body a having a pipe receiving recess 1 at its tip by a pivot shaft 3.

A ratchet plate 5 having ratchet teeth 4 formed on its periphery is protruded from the inner lower part of the cutting blade plate.

Although the drawing shows a case in which the cutting blade plate and the ratchet plate 5 are connected by two screws 6, these two plates may be formed integrally.

An operating lever 8 equipped with a ratchet pawl 7 that engages with the ratchet teeth 4 is opposed to the handle body a, and its tip is pivoted to the left shoulder 9 of the handle body a by a shaft 10. Ratchet mechanism 1 by vibrating
The cutting blade plate is formed so as to rotate via 1.

In the ratchet pawl 7 shown in the drawing, the distal end of a ratchet pawl plate 12, which has the ratchet pawl 7 formed at its tip, is pivotably vibrated between the upper parts of the operating lever 8 located slightly below the shaft 10 by means of a mounting shaft 13. In the case where each end of the torsion spring 14 wound around the mounting shaft 13 is brought into contact with the ratchet pawl plate 12 and the operating lever 8, the ratchet pawl 7 is always engaged with the ratchet teeth 4. It shows.

A female screw hole 16 is formed in the pivot portion 15 of the cutting blade plate of the right shoulder portion 2 of the main body a with handle.

The drawing shows that a large diameter hole 17 is formed in the right shoulder part 2 of the handle body a without directly forming the female threaded hole 16, and a female threaded cylinder 18 having the female threaded hole 16 is inserted into this large diameter hole 17. At least fixing screw 1
9 shows the case where it is fixed to the handle body a.

The male screw tube 20 is screwed into this female screw hole 16.
Bring the tip of the 0 into contact with the side surface of the cutting blade plate.

The drawing shows a case where the ratchet plate 5 is brought into contact with the side surface of the ratchet plate 5 fixed to the cutting blade plate.

The distal end of the release lever 21 is fixed to the circumferential surface of the distal end of the male threaded cylinder 20 in a supported state.

In the drawing, a notch recess 22 is formed at the tip of the male screw tube 20,
A fitting hole 23 that exactly fits into the remaining tip of the male threaded tube 20 is bored at the tip of the release lever 21, and the male screw tube 2
Although the case where the release lever 21 is provided in a supported state is shown in FIG.

In the drawing, a pressing spring 24 is provided between the release lever 21 and the handle body a, which rotates the male screw tube 20 penetrated by the pivot shaft 3 and presses it against the cutting blade plate.

The pressing spring 24 is shown in the case where a tension coil spring is stretched between the distal end of the release lever 21 and the lower end of the handle 25, but the pressing spring 24 may be provided in other ways as well.

A finger hook protrusion 26 provided at the tip of an arm 27 pivoted to a handle 25 of the handle body a is provided to protrude from the side surface of the handle body a at a position near the end of the release lever 21.

A protrusion 29 that is pushed by a finger hook protrusion 26 is provided at the distal end of the release lever 21.

A protruding piece 30 facing the release lever 21 is provided to protrude from the ratchet pawl 7.

The drawings show a case in which a protruding piece 30 is connected and protruded from the tip of the ratchet pawl plate 12.

An opening spring 31 is provided between the cutting blade plate and the handle body a for rotating and pulling out the cutting blade plate from the pipe receiving recess 1.

In the drawing, a hooking device 32 is installed slightly above the shaft rod 10 of the left shoulder portion 9 of the handle body a, and a hooking protrusion 33 is formed at a position slightly above the ratchet teeth 4 of the ratchet plate 5. Although a case is shown in which both ends of the open spring 31 are stretched over the hook protrusion 33, a structure having the same effect as this may be adopted.

In the figure, reference numeral 34 is a stopper piece 35 which has three receiving sides for supporting the end edge of the ratchet plate 5 and is located slightly below the right shoulder 2 of the handle body a so that it can be rotated. Adjust the opening angle of the cutting blade plate to 3 to match the diameter of the pipe to be cut.
A cutting opening amount adjustment mechanism that can be adjusted in steps, 37 is a blade receiving groove, 3
8 is a nut screwed onto a male threaded portion 39 formed at the tip of the pivot shaft 3, 40 is a seat plate that is engaged with the side end of the female threaded cylinder 20, and 41 is a floating gap.

A cutting tool called a pipe cutter is used to cut pipes made of synthetic resins such as hard vinyl chloride, which are often used as various piping materials.

The structure of this type of pipe cutter is that an operating lever is pivoted to a handle body that has a pipe receiving recess at the tip, and by vibrating this operating lever, it is attached to the handle main body in a state facing the pipe receiving recess. The cutting blade plate is rotated via a ratchet mechanism to cut the pipe, but even after the pipe cutting is finished, the cutting blade remains wedged in the pipe receiving recess and remains closed. Before you start cutting the pipe, be sure to grasp the operating lever and the handle of the handle body with your right and left hands, and the cutting opening cannot be opened unless it is expanded, so you must cut the pipe continuously. It became extremely troublesome and its efficiency decreased.

The present invention solves these drawbacks, and the operation of the above-mentioned structure will now be described with reference to the drawings.

The position of the cutting blade plate indicated by the solid line in Fig. 2 indicates the state where pipe cutting has been completed.
When the finger grip protrusion 26 is pressed with the abdomen of the thumb of the hand holding the arm 27, the arm 27 vibrates around the shaft 28, and the protrusion 2
9 to vibrate the release lever 21 against the pressing spring 24, and at the same time, the ratchet pawl plate 12 is torsionally vibrated against the spring 14 through the protrusion 30 provided opposite the projection 29. urge

These two operations are performed at the same time, and the vibration of the first release lever 21 causes the male screw tube 20, which is supported at the tip of the first release lever 21, to rotate, and the male screw tube 20 is removed from the side of the ratchet plate 5. 20, the lateral pressure applied to the ratchet plate 5 from the handle body a by the pivot shaft 3 is released, and the opening spring 31 provided between the ratchet plate 5 and the handle body a is released. As a result, the ratchet plate 5 attempts to rotate, but since the engagement between the ratchet pawl 7 and the ratchet teeth 4 has not yet been released, the rotation does not occur.

However, at the same time as this action, a second vibrating action of the ratchet pawl 7 is performed, so that the ratchet pawl 7 is disengaged from the ratchet teeth 4, so that the force of the opening spring 31 causes the ratchet plate 5 to be removed from the cutting blade plate. Rotates around pivot shoe 3,
The cutting blade plate is pulled out from the pipe receiving recess 31 as shown by the imaginary line in FIG. 2, and the cutting opening is opened.

To cut a pipe with this cutter, insert the pipe between the pipe receiving recess 1 of the open cutting port and the cutting blade plate, hold the handle 25, and place your finger on the operating lever 8 to grip it.
Since the ratchet pawl 7 presses the ratchet plate 5 and advances the cutting blade plate, if this operation is repeated, the cutting blade plate will gradually cut into the pipe and the pipe will be cut.

When cutting is completed, as described above, press the finger hook projection 26 with your thumb to widen the cutting blade plate, and you are ready to cut the pipe again.

As described above, the present invention is convenient because the cutting opening of the pipe cutter is opened wide by simply pressing the finger hook protrusion 26 while holding it with the thumb, and continuous cutting of pipes can be efficiently performed with one hand. It provides pipe cutters.

[Brief explanation of drawings]

Figure 1 is a front view, Figure 2 is a partially cutaway front view, and Figure 3 is a front view.
The figure is a side sectional view thereof. 1...Pipe receiving recess, 2...Right shoulder part,
3... Pivot shaft, 4... Ratchet teeth,
5... Ratchet plate, 7... Ratchet pawl, 8... Operation lever, 9... Left shoulder, 11... Ratchet mechanism, 15...
・Pivot part, 16...Female screw hole, 20...
・Male screw tube, 21...Release lever, 25...
...Handle, 26...Finger hook protrusion, 27...
・Arm, 29... protrusion, 30... protrusion,
31... Opening spring, a... Main body with handle,
b... Cutting blade plate.

Claims (1)

[Scope of utility model registration request] A cutting blade plate facing the pipe receiving recess is rotatably attached to the right shoulder of the handle body having a pipe receiving recess at the tip by a pivot shaft, and ratchet teeth are provided on the periphery of the inner lower part of the cutting blade plate. The formed ratchet plate is provided protrudingly, and an operating lever equipped with a ratchet pawl that engages with the ratchet teeth is opposed to the handle body, and its tip is pivoted to the left shoulder of the handle body, and the operation lever is vibrated. In a pipe cutter that rotates the cutting blade plate via a ratchet mechanism by tightening the handle, a female threaded hole is formed in the pivot point of the cutting blade plate on the right shoulder of the handle body, and a male threaded tube is inserted into this female threaded hole. Screw it in so that the tip of the male screw tube comes into contact with the side of the cutting blade plate, and fix the tip of the release lever to the circumferential surface of the tip of this male screw tube in a non-rotating state, and pivot it to the handle of the handle body. A finger hook protrusion provided at the tip of the released arm is provided so as to protrude from the side of the handle body at a position near the end of the release lever, and a protrusion that is pushed by the finger hook protrusion is provided at the end of the release lever. A pipe cutter characterized in that a protruding piece facing the ratchet pawl is provided protruding from the ratchet pawl, and an opening spring is provided between the cutting blade plate and the handle body to rotate and pull out the cutting blade plate from the pipe receiving recess. Cut opening mechanism.