JPS5927255Y2 - Scissors for cutting synthetic resin pipes - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to scissors for cutting synthetic resin pipes such as hard vinyl chloride resin pipes, soft vinyl chloride resin pipes, and other synthetic resin pipes.

Conventionally, synthetic resin pipes have been cut with a saw, but the cutting process is time-consuming and requires a constant flow of chamfering of the cut end after cutting, resulting in poor workability.

Therefore, the present applicant has developed a pair of scissors for cutting resin pipes as described in Japanese Utility Model Publication No. 5427655 and Japanese Utility Model Publication No. 54-27656. The tip of the lower handle is pivotally supported on the lower jaw, and a cutout is provided at the front end of the upper handle across the tip of the lower jaw. A cutting blade is interposed between the cutting blade and the lower handle, and an interlocking mechanism 4 of the cutting blade is interposed between the cutting blade and the lower handle. This type of plastic pipe cutting machine was originally developed, but when using this type of plastic pipe cutting scissors to cut rigid pipes such as hard PVC pipes, the pressure applied by the cutting blade is applied to the entire pipe. Because of the distortion of the casing, the larger the diameter, the more likely the tube would crack and break.

When cutting soft materials such as polyethylene resin pipes and soft vinyl pipes, the cutting blade cannot cut into the pipe because the pipe deforms and escapes during cutting, and in some cases, the cutting blade may deform the pipe. There is a drawback that the cutting blade may be cracked or chipped due to being strained.

The present invention has been perfected as a shears for cutting synthetic resin pipes without the above-mentioned drawbacks.Hereinafter, the present invention will be explained in detail with reference to 4 illustrated embodiments.1 is an upward arcuate pipe holding part. It is an upper handle connected to the tip of the lower jaw 34, which has two handles, and a cutting blade 5 is attached to the front part of the upper handle 1 by @4.
The central part of the handle 1 is pivotally supported via an interlocking mechanism 4 to be described later.
, 7, and the tip of the lower handle 7 is pivotally supported on the lower jaw 3 by @6.

As shown in FIG. 2, a cutout 8 extending over the tip of the lower jaw 3 is provided at the front end of the upper handle 1, and the cutting blade 5 is interposed within the cutout 8.

The rear end of the cutting blade 5 has a locking pawl 9 which engages with a ratchet 11 which is pivoted on the lower handle 7 by @10, and which ratchet 11 is supported by a spring 12 provided at @10.
The ratchet 11 and the locking pawl 9 are constantly pressed against the locking pawl 9 by zero force, and the both handles 1 are pressed together with the connecting rod 17, which will be described later.
The lower handle I and the cutting blade 5 are constructed by an interlocking mechanism for pivoting the cutting blade to pivot the cutting blade 4 in stages when the scissors are moved.
is interposed between.

E. On the upper handle 1, an arcuate pipe holding part 13 having a diameter equal to the diameter of the synthetic resin pipe to be cut, and one end of a restraining holding member 14, which is shaped downward, is pivotally supported by @4.

As shown in FIG. 2, the restraint holding member 14 consists of two flat plates on the left and right sides, and their tips are joined together by a pin 15.

On the other hand, the restraining and holding member 14.1 is attached to the thick tip of the lower jaw 3.
A locking part 16'' that engages and releases the pin 15 gold provided at the tip of 4.
is provided.

Further, a connecting rod 17 is pivotally supported on the ratchet 11 by a pin 18, and the other end of the connecting rod 17 is slidably attached to a through hole 19 formed diagonally in the cutting blade 5 by a pin 20. There is.

With this arrangement, first open the upper and lower handles 1 and 7 as shown in FIG. Since the handles 1 and 7 are provided, the handles 1 and 7 can be opened easily.

When the 5 handles 1.7 are opened, the distance between the shaft 4 of the upper handle 1 and @10 of the lower handle 7 increases, so the ratchet 11, the cutting blade 5, and the connecting rod 17 are The pin 20 at the tip of the connecting rod 1T of the interlocking mechanism slides in the through hole 19 to take the position shown in FIG. 1, and the cutting blade 5 opens to the maximum extent with respect to the lower jaw 3.

Next, the synthetic resin pipe 22 to be cut was opened upward centering around the restraint holding member 14kmM4 and placed on the upward tube holding part 2 of the lower jaw 3, and then the restraint holding member was closed with 14k gold and its tip was joined with gold. The pin 15 is locked and fixed to a locking part 16 provided at the tip of the lower jaw 3.

As a result, the synthetic resin tube 22 is fixed all around by the upward tube holding section 2 of the lower jaw 3 and the downward tube holding section 13 of the restraint holding member 14.

Next, when both handles are closed 1°74, the distance between @4 and @10 becomes smaller, so the pin 20 of the connecting rod 17 is inserted into the through hole 1.
9 slides upward on the inner ring, and at the same time the ratchet 11 tilts counterclockwise so that its lowermost notch engages the locking pawl 9 of the cutting blade 5.
This leads to an engagement with

As the handle 1.7 further closes, the ratchet 11 pushes up the locking pawl 9, causing the cutting blade 5 to pivot little by little counterclockwise around the alignment center, and the cutting edge cuts into the synthetic resin pipe 22. Money starts.

As is clear from FIG. 3, this cutting blade 5 passes through the metal between the two restraining and holding members 14 and cuts into the synthetic resin pipe 22. As mentioned above, the entire circumference of the synthetic resin pipe 22 is a pipe. Because it is fixedly restrained by the holding parts 2 and 13,
Even when cutting gold metal, there is no room for deformation of the tube 4, and the surface of the tube does not escape from the cutting edge, so the cut can be made reliably.

Next, when the handles 1 and 7 are opened, only the 1-inch ratchet 11 that holds the cutting blade 5 in its position 4 is pulled down by the frictional force, and the locking pawl 9 at the rear end of the cutting blade 5 is moved one step above the ratchet 11. engages with the notch.

Then, when the handles 1 and 1 are closed again, the ratchet 11 immediately pushes up the locking pawl 9, so the cutting blade 5 moves deeper into the pipe 2.
In this way, as the handle 1.7 is opened and closed, the engagement position between the locking pawl 9 and the ratchet 11 naturally moves to the upper side of the ratchet 11, and the cutting blade 5 gradually moves downward and deeper. As the cutting continues, the cutting edge finally sinks into the tube holding portion 2 of the lower jaw 3 and the synthetic resin tube 22 is completely severed, as shown in FIG.

In this cutting process, @4, which is the pivot point of the cutting blade 5,
Since the distance between this and the locking pawl 9, which is the point of effort, is always constant, the cut is made with a constant cutting force from beginning to end, and the synthetic resin tube 22 is restrained by the brass tube holders 2 and 13 all around it. There is no excessive distortion in the synthetic resin tube 22 throughout the entire cutting process, and there is no fear of cracking 4 even when cutting a large diameter hard blue metal.

1. What is shown in FIG. 4 is another embodiment of the present invention, which is devised so that one synthetic resin pipe cutting scissor can cut 4 synthetic resin pipes of various diameters.

The upward tube holding portion 2 formed on the lower jaw 3 is formed into an arc shape with a circular arc having five different radii of curvature, and the downward tube holding portion 13 of the restraint holding member 14 also has five corresponding radii of curvature. It has an impressive arc-shaped shape.

Furthermore, five notches 23 are formed on the outer surface of the distal end of the restraint holding member 14, and a pin 24□ is formed on the distal end of the lower jaw 3.
A locking portion slidably mounted within the elongated hole 25 is provided.

Therefore, if the pin 24 metal is engaged with the appropriate notch 23 according to the pipe diameter and the tip metal of the restraint holding member 14 is locked, the synthetic resin pipe will be shaped into a circular arc according to the pipe diameter of the pipe holding parts 2 and 13 above and below it. The outer periphery is held in place, and as in the case of the previous embodiment, the synthetic resin pipe is cut smoothly with little room for deformation.

As is clear from the description of the above embodiments, the present invention has a downwardly arcuate tube holding portion 4 with a restraining and holding member metal biased, so that the tube is not deformed or distorted by the pressure applied by the cutting blade, and is soft. Even when cutting soft metal such as vinyl pipe, the surface of the synthetic resin pipe does not escape from the cutting edge and the cut is made reliably. Completely prevents cracking or chipping.

In addition, when cutting a hard synthetic resin such as a hard PVC pipe, the entire circumference of the synthetic resin pipe is restrained, so the pressure applied by the cutting blade can cause distortion in the entire synthetic resin pipe. There is no need for chamfers, and the synthetic resin pipes do not crack even with large pipe diameters, and the cutting work is easy and the cuts are beautiful, with no need for chamfers. The practical value of scissors for cutting plastic pipes is extremely high even if the disadvantages of scissors for cutting plastic pipes are eliminated.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the first embodiment of the present invention.
FIG. 2 is a partially cutaway plan view, FIG. 3 is a partially cutaway front view showing the metal fitting in the same state, and FIG. 4 is a partially cutaway front view of a second embodiment of the present invention. 1... Upper handle, 2... Tube holding part,
3... Lower jaw, 4... Axis, 5...
- Cutting blade, 7... Lower handle, 9...
Locking pawl, 11...Ratchet, 13...
・Pipe holding part, 14...Restriction holding member, 15...
····pin. 16...Locking portion, 17...Connection rod.

Claims (1)

[Scope of utility model registration request] The tip 4 of the lower handle is pivoted to the lower jaw of the upper handle connected to the tip of the lower jaw metal that tilts the upper arc-shaped tube holding part, and the tip 1 of the lower handle is extended to the tip of the lower jaw at the front part of the upper handle. A cutting blade pivotally supported by the upper handle is interposed in the split portion provided in the above-mentioned manner, and a ratchet, a locking pawl engaged with the ratchet, and a connecting rod are disposed between the cutting blade and the lower handle. In this synthetic resin pipe cutting machine having an interlocking mechanism 4 interposed for pivoting the cutting blade, the upper handle has metal ends on left and right restraining members 14, 14 each having an arc-shaped pipe holding part 13 facing downward. 4
Synthetic resin pipe cutting scissors characterized in that a locking part 164 is provided at the tip of the lower jaw 3 to engage and disengage the pin 15 which is metal-bonded at the tip of the restraining and holding member 14.14.