JPH028654Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a cutting tool for lightweight channel steel, and is suitable for use when installing recessed lighting equipment, etc. in so-called double ceiling construction. It is used to cut the lightweight channel steel called "noen material" used to stretch and support ceiling panels, etc., and is small and lightweight, making it easy to carry and use even in narrow ceiling spaces. This invention relates to a cutting tool for lightweight channel steel.

[Technical background of the invention and its problems] Conventionally, in ceiling construction, ceiling boards are pasted by horizontally framing lightweight channel-shaped steel field materials, and various electrical components and parts are installed in ceiling pockets. We are also installing air conditioning components and disaster prevention components. At that time, lightweight channel steel is delivered to the site as a standard size and is used as edge material or support beam material by cutting it into predetermined dimensions, and the cutting is done using a hacksaw etc. is being carried out. However, since the lightweight channel steel itself has a wall thickness of about 0.5 mm, cutting it is troublesome and time-consuming, and the cut does not look good, and the sharp edges that remain at the cut end can pose various obstacles to the work. Ta.
Not only that, but performing this type of work in a narrow, high ceiling forced workers into uncomfortable postures, which was dangerous.

For this reason, in order to eliminate these drawbacks, for example, Japanese Utility Model Application Publications No. 54-7484 and No. 54-36193 have been proposed.
No. 54-141582, No. 55-41260, No. 55-60920, No. 55-156821,
Cutting tools have been proposed in Japanese Patent No. 55-160729 and further in Japanese No. 58-97817. However, with all of these, when cutting, cutting chips remain in the bifurcated die, making the next operation troublesome, and with long-term use, the gap between the dies becomes wider and the cutting performance deteriorates. Additionally, lightweight channel steel is typically
Since there is a U-shaped lip along the edge of the opening, when cutting this, it is necessary to open the cutting tool wide, and since it is impossible to grasp it with the fingers of one hand, Unable to obtain cutting power,
Workability was sometimes lacking, and the cut edges were sometimes wrinkled, causing damage to the fingers and other parts of the work.

[Purpose of the invention] Therefore, this invention was devised in view of the existing points mentioned above, and it is a method for crushing the U-shaped lip along the lightweight channel steel that is the object to be cut. By being able to do this, it is possible to quickly and reliably cut without having to make a large opening in the tool itself, and the die spacing does not become distorted even after many years of use, maintaining good cutting performance and making it easy to handle. The purpose is to provide cutting tools.

[Summary of the invention] Therefore, in this invention, a first handle is provided with a cutting blade connected to the front part, and a second handle is provided with a die consisting of a pair of left and right receiving blades facing each other in the front part. The first
A cutting tool for lightweight channel steel that cuts the object by swinging the cutting blade into and out of the die by swinging the handle, is horizontally fixed between the receiving blades at the tip of the die. The fixing pin is located inside the biting tip of the cutting blade tip, and the second
The crushing piece pivotally supported on the handle is moved forward and backward through the guide means by the rocking operation of the second handle, across the presser die part protruding outward from the front of the first handle. However, by doing so, we succeeded in achieving the above objective.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings.

The reference numeral 10 shown in the figure is a first handle, which has a grip portion at the rear, a cutting blade 11 whose side surface is approximately doglegged, and which is connected to the front portion.
0 is a second handle, which has a grip portion at the rear;
A die 21 consisting of a pair of left and right receiving blades 22 facing each other is connected to the front part. The first handle 10 and the second handle 20 are pivotally connected to each other so that the first handle 10 and the second handle 20 can swing freely. The lightweight channel steel S, which is the object to be cut and which is sandwiched between the cutting blade 11 and the die 21, is cut by cutting it by the width of the cutting blade 11 or the gap width of the die 21.

In the illustration, the first handle 10 main body is formed by bending a suitably thick sheet material into a substantially groove-shaped cross section, the rear part of the cutting blade 11 is sandwiched between the front end of the bifurcated part, and the rivet 15 is secured. By doing this, it is fixedly connected. On the other hand, the main body of the second handle 20 is formed by bending a suitably thick sheet material into a generally groove-shaped cross section, and is fixedly connected by sandwiching a die 21 inside the front end of the bifurcated part and fixing it with a rivet 26. (See Figure 2). And the swinging shaft mounting of both 10 and 20 is
This is done by making the first handle 10 and the second handle 20 approach each other by crossing them in an X-shape using a shaft pin 16 that is inserted so as to match the front position of the cutting blade 11 and the center position of the die 21. When the cutting blade 11, especially the beak-shaped biting tip 12 extending at its tip, hits the receiving blade 2 near the tip of the die 21,
The two are designed to immerse into each other's space.

In addition, the reference numeral 17 is a return spring made of wire, which is wound around a horizontally suspended pin at approximately the center inside the second handle 20, and both ends are connected to the first
The insides of the handle 10 and the second handle 20 are held in a tensioned manner, and both are elastically biased to expand at all times.

A fixing pin 23 is horizontally fixed between the receiving blades 22 at the tip of the die 21, and the fixing pin 23 itself enters the presser die part 13 by swinging the first handle 10. When the biting tip 12 of the cutting blade 11 is retracted, it is positioned inside it. That is, the presser die part 13
When the cutting blade 11 is retracted into the interior, the tip of the cutting tip 12 cuts into the lightweight channel steel S, and as it is retracted, the rear part of the cutting tip 12 cuts into the lightweight channel steel S. Cutting is performed while moving backwards in order to reach the edge, and a fixing pin 23 prevents cutting waste from entering the die 21 after cutting.

Reference numeral 24 denotes a collar rotatably fitted onto the fixing pin 23, which prevents the receiving blades 22 in the die 21 from approaching or blocking each other, and keeps the distance between the receiving blades 22 constant at all times.

Moreover, the first handle 10 and the second handle 20
A crushing mechanism is attached which crushes a part of the lightweight channel steel S by the swinging operation of the crushing piece 25 which is pivotally supported on the second handle 20. The presser die portion 13 protruding from the presser die portion 13 is moved forward and backward via the guide means 30 by the swinging operation of the second handle 20.

The presser die portion 13 shown in the figure is formed by protruding the rear end portion of the cutting blade 11 to the outside of the first handle 10 body, and also includes a crushing piece 25.
The rear end is pivotally supported at approximately the center of the second handle 20, and the front end is made to protrude and retract from a presser window 14 cut out in the front part of the main body of the first handle 10 to advance and retreat from the presser die part 13. It is. At that time, the pressing surfaces of the crushing piece 25 facing the pressing die part 13 should be parallel to each other, and after advancing,
The crushing piece 25 is pivotally supported at a predetermined position of the second handle 20 at a position corresponding to the thickness of the portion of the lightweight channel steel S to be crushed after crushing. The operation of the crushing piece 25 and the presser die part 13 can be carried out, for example, by positioning and setting the presser die part 13 inside the lip L of the lightweight channel steel S, and then pressing the first handle 1
0, the crushing piece 25 is caused by the swinging of the second handle 20.
is caused to come out from the presser window 14, and the lip L is crushed together with the presser die portion 13.

The guide means 30 for this purpose is formed by slidingly fitting a guide pin 32 fixed to the first handle 10 into a long guide hole 31 formed in the crushing piece 25, and the first handle 10 and the second handle The guide elongated hole 31 of the crushing piece 25 is formed so that the front part of the crushing piece 25 moves toward the presser die part 13 by swinging with the crushing piece 20.
5 is provided in an inclined shape behind the first handle 10 or the second handle 20, and the end on the pressing surface of the crushing piece 25 is located in the front of the first handle 10 or the second handle 20. and
Due to the swinging operation of the first handle 10 and the second handle 20, the crushing piece 25 itself swings about its pivot position as the inner edge of the guide slot 31 comes into sliding contact with the guide pin 32, and The presser surface, which is the section, moves forward facing the presser die section 13.

Note that connecting the crushing piece 25 pivotally supported on the second handle 20 to the guide pin 32 fixed to the first handle 10 via the guide slot 31 in this way means that the first handle 10 and the second handle 20 is made to correspond to the opening length of the guide elongated hole 31. Therefore, for example, even though the first handle 10 and the second handle 20 are mutually expanded by the return spring 17, the gap between them is stopped at a position where they can be grasped by the operator's fingers. It is preferable to set the front end position of the guide slot 31 in advance. By doing so, the first handle 1 is expanded by the expanding action of the return spring 17.
0. The second handle 20 can be prevented from expanding more than necessary, and can be kept expanded to the extent that it can be grasped with fingers.

Next, to explain the use of this, as shown in FIG. The lip L of the steel S is crushed (see right side in Fig. 1), and then the lightweight channel steel S is sequentially cut from its opening direction (first
After that, as shown in FIG. 7, it is bent and erected at the cut point, and various members such as a predetermined lighting fixture R are installed.

In addition, when cutting the lightweight channel steel S, if it is a narrow piece called a so-called single bar, if it is a wide piece called a so-called double bar, depending on the order of one side wall, the other side wall, and the bottom wall. ,
It is sufficient to cut one side wall, the other side wall, one half of the deep wall, and the other half of the deep wall in this order.

[Effect of the invention] Therefore, by the swinging operation by gripping both the first handle 10 and the second handle 20, the crushing piece 25 advances toward the presser die portion 13, and a crushing action is exerted during that time. By doing this, for example, the lip L of the lightweight channel steel S in which a gap is formed can be crushed, and the gap between the cutting blade 11 at the front end of the first handle 10 and the second handle 20 and the die 21 can be crushed. By exerting the cutting action, it is possible to easily cut lightweight channel steel S, and since the entire structure is small and lightweight, it is easy to carry and can be used easily even in narrow ceiling spaces. be.

In particular, the crushing piece 25 pivotally supported on the second handle 20
is moved forward and backward toward the presser die part 13 protruding outward from the front part of the first handle 10 via the guide means 30 by the rocking operation of the second handle 20. For example, the third As shown in the figure, when the presser die part 13 is set inside the crack of the lightweight channel steel S, and then the second handle 20 is closed and swung,
As shown in FIG. 4, the crushing piece 25 moves forward and can crush the lip L portion together with the presser die portion 13. For this reason, in the past, if there was a gap in the cutting area, it was impossible to set the cutting tool itself when cutting unless the cutting tool itself was opened wide, and the cut edge may become distorted when cutting. By crushing this, which can become unsightly and dangerous, there is no need to open the cutting tool wide, and by using it as a preliminary work for cutting, it can be held with one hand. the first handle in the range 10;
The second handle 20 can be expanded quickly,
This ensures reliable cutting work.

In addition, since the fixing pin 23 horizontally fixed between the receiving blades 22 at the tip of the die 21 is positioned inside the biting tip 12 at the tip of the cutting blade 11, as shown in FIG. After the desired cutting portion of the lightweight channel steel S is sandwiched between the die 21 and the die 21 and cut, as shown in FIG. Therefore, no cutting debris remains in the die 21, and the next operation can be carried out smoothly.

As explained above, according to this invention, the U-shaped lip along the lightweight channel steel to be cut can be crushed quickly and reliably without the need to open the tool itself wide. We aim to cut the
In addition, the die spacing does not become distorted even after long-term use.
In addition to being able to maintain good cutting performance, it has extremely useful effects in practice, such as being easy to handle.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view of the lip in use, Figure 2 is a sectional view, Figure 3 is a sectional view of the main part showing the set state when crushing the lip, Figure 4 is a sectional view of the main part after crushing the lip, and Figure 5 is a sectional view of the main part showing the set state when crushing the lip. The figure is a sectional view of the main part showing the set state when cutting, Figure 6 is a sectional view of the main part after cutting, and Figure 7 is the ceiling surface when cutting lightweight channel steel and placing lighting equipment etc. FIG. C...Ceiling, L...Lip, R...Lighting equipment,
S... Light channel steel, 10... First handle, 11
... Cutting blade, 12 ... Biting tip, 13 ... Holder die part, 14 ... Holder window, 15 ... Rivet, 16
...Axis pin, 17...Return spring, 20...
Second handle, 21...Die, 22...Blade, 2
3...Fixing pin, 24...Collar, 25...Crushing piece, 26...Rivet, 30...Guiding means, 31
... Guide slot, 32 ... Guide pin.

Claims (1)

[Claims for Utility Model Registration] 1. A first handle having a cutting blade connected to the front part;
A die consisting of a pair of left and right receiving blades facing each other is pivotably connected to a second handle connected to the front part, and the cutting blade is inserted into the die by swinging the first handle. In a cutting tool for lightweight channel steel that cuts the workpiece by swinging in and out, a fixing pin fixed horizontally between the receiving blades at the tip of the die is positioned inside the biting tip of the tip of the cutting blade. In addition, the crushing piece pivotally supported on the second handle is moved forward and backward through the guide means by the swinging operation of the second handle, by the pressing die part protruding outward from the front of the first handle. A cutting tool for lightweight channel steel. 2. The guide means is a long guide hole bored in the crushing piece,
A cutting tool for lightweight channel steel according to claim 1, which comprises a guide pin fixed to the first handle and slidably fitted thereto.