JP2002337021A - Cutter for lightweight channel steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter facilitating the cutting of a lightweight channel steel by a small force. SOLUTION: This cutter for the lightweight channel steel is provided with a receiver tooth 2 having a pair of channel cutting blades 3 opposed to each other at a prescribed interval apart from each other and a pushing tooth 5 having an angle cutting blade 6 fitted in the channel cutting blades in such a state as freely appearing therefrom/disappearing therein. The receiver tooth 2 and the pushing tooth 5 are rotationally connected together in respective one end part sides, the crown part 6a of the angle cutting blade 6 of the pushing tooth 5 is positioned in the central part of the groove width of the respective channel cutting blades 3, a first lever 10 is integrally connected to the receiver tooth 2, a second lever 11 is rotationally connected to the base end of the first lever 10, and a feed mechanism 13 rotationally moves the pushing tooth 5 in the direction of the receiver tooth 2 when the second lever 11 moves rotationally in the direction of the first lever 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight channel steel cutter used as, for example, a ridge for supporting a ceiling plate of a building or a ridge for receiving the ridge.

[0002]

2. Description of the Related Art As a conventional technique, one end of a pair of levers is connected to each other by a rotatable pin so as to cross each other, and a receiving tooth and a pushing tooth are attached to one end of each lever so as to face each other. Forming, on the receiving tooth, a female cutting edge with a straight cutting edge facing in parallel, and forming, on the pushing tooth, a straight male cutting edge fitted to the female cutting blade so as to be able to protrude and retract, There has been a cutter that cuts a lightweight channel steel with both cutting edges by rotating the receiving teeth and the pushing teeth in the approaching direction through the, and fitting the male cutting edge to the female cutting edge. .

[0003]

In the above-mentioned conventional cutter, since the female cutting edge and the male cutting edge are both straight, when cutting a lightweight channel steel, the female cutting edge and the male cutting edge are required. However, it is necessary to sequentially change the direction of the cutter so as to cut along the predetermined cutting side of the lightweight channel steel, and the operation becomes troublesome. In addition, a space is required around the cut portion of the lightweight channel steel so that the cutter can be turned. Without this space, the lightweight channel steel cannot be cut. As a countermeasure, there is a means of cutting the lightweight channel steel with a disc grinder, but this generates sparks at the time of cutting, lowering safety and generating loud noises, which hinders night work etc. Was to come. An object of the present invention is to provide a new lightweight channel steel cutter which solves the above-mentioned problems.

[0004]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 has a receiving tooth having a pair of groove-shaped cutting blades facing each other while maintaining a predetermined gap, and a push tooth having a mountain-shaped cutting blade fitted so as to protrude and retract from the groove-shaped cutting blade. The receiving tooth and the pushing tooth are connected rotatably at one end side, respectively, and the top of the mountain-shaped cutting blade of the pushing tooth is located at the center of the groove width of each of the groove-shaped cutting blades. A first lever is integrally connected to the receiving tooth, a second lever is rotatably connected to a base of the first lever, and a second lever is provided between the second lever and the pushing tooth. A feed mechanism is provided for rotating the push teeth in the tooth direction when rotating in the lever direction. According to a second aspect of the present invention, the angle of intersection of the angled cutting blade is about 90 degrees.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a side view showing a cut state of a lightweight channel steel.

In FIGS. 1 and 2, reference numeral 1 denotes a lightweight channel steel cutter, 2 denotes a receiving tooth thereof, and 5 denotes a pressing tooth thereof. The receiving tooth 2 has two groove-shaped plates 2a, 2a facing each other, spacers 2b, 2b interposed at left and right ends thereof and integrally connected by small screws, and a predetermined intermediate portion at the left and right intermediate portions. A gap (a) is generated. Also, each plate 2a, 2a
2 is polished so as to form an outer downward slope as shown in FIG. 2 to form a pair of groove-shaped cutting blades 3 and 3 facing each other while maintaining a predetermined gap (A). In addition, this groove-shaped cutting edge 3,
The section 3 may be a rectangular section instead of an outward slope.

As shown in FIG. 3, the groove widths and depths of the grooved cutting edges 3 and 3 are set so that the light-weight grooved steel W to be cut can be fitted closely. As shown in FIG. 2, the gap (a) between the cutting edges 3 and 3 is a gap into which the pushing teeth 5 are slidably fitted.

A push tooth 5 is rotatably connected to the upper right end of the receiving tooth 2 via a fulcrum pin 8 composed of a bolt and a nut. The pushing teeth 5 are formed by one plate,
A downwardly angled cutting blade 6 is integrally formed on the left part. The thickness of the angled cutting edge 6 is such that it fits closely into the gap (a), and the top 6a of the angled cutting edge 6 is the groove-shaped cutting edge 3, 3 described above.
At the center of the groove width (left and right). The cross angle α of the angled cutting edge 6 is about 90 degrees.

A first lever 10 is integrally connected to the receiving teeth 2 described above, and a lever pin 12 is connected to a base of the first lever 10.
The second lever (lever) 11 is rotatably connected via
When the second lever 11 rotates in the direction of the first lever 10 between the second lever 11 and the pushing tooth 5, a feed mechanism 13 that rotates the pushing tooth 5 in the direction of the receiving tooth 2 (the direction of arrow C). Is provided.

The feed mechanism 13 is, as shown in FIG.
An arc piece 5a centered on the fulcrum pin 8 is formed on the right side of the push tooth 5, and a saw-toothed engaging tooth 14 is formed on the outer periphery of the arc piece 5a. On the other hand, a feed pawl 15 which can be disengaged from the engaging tooth 5b via a pawl pin 16 is provided at the base of the second lever 11.
Are rotatably connected, and the feed claw 15 is
7 urges the pawl pin 16 to rotate in the counterclockwise direction in FIG.

As a result, when the second lever 11 is rotated in the direction of the first lever 10 (in the direction of arrow A), the feed pawl 15 is engaged with the engaging tooth 14 and the pushing tooth 5 is moved to the fulcrum pin 8.
1 is rotated leftward in the direction of arrow C in FIG.
When the second lever 11 is rotated in the direction opposite to the arrow A, the feed claw 15 is disengaged from the engagement tooth 14 and the feed claw 15 moves to the left (downstream) in FIG. Side) and the feed claw 15 is engaged with the engagement teeth 14 on the downstream side.

By repeating the operation of the second lever 11, as shown by the imaginary line in FIG. 3, the angled cutting edge 6 of the push tooth 5 gradually fits deeper into the grooved cutting edge 3 from the top 6a. , Lightweight channel steel W fitted to receiving teeth 2 (channel cutting blades 3)
From the bottom center toward both sides. In FIGS. 1 and 2, reference numeral 18 denotes a pulling lever for returning the pressing tooth 5, the front end of which is rotatably locked to the pressing tooth 5, and the rear end of which is formed on the rotation end side of the feed pawl 15. 1
5a is engaged via a longitudinal hole (not shown) in the front-rear direction.

The pulling lever 18 and the pulling claw 15a operate as follows. That is, the push tooth 5
In the rotation range of the second lever 11 required to feed the second lever 11, that is, in the normal rotation range, the pulling claw 15a plays back and forth in the elongated hole at the rear end of the pull lever 18, and the second lever 11 When the rotary lever 11 is rotated in the direction indicated by the arrow (a) larger than the normal rotation range, the pulling claw 15a is engaged with the rear end of the pulling lever 18, and the pulling lever 18 is moved backward ( 1 (rightward in FIG. 1), the push tooth 5 is rotated in the direction opposite to the arrow (c) about the fulcrum pin 8, and the angled cutting edge 6 is retracted (separated) from the grooved cutting edge 3.

[0014]

As described above, according to the first aspect of the present invention, the cutting edge of the receiving tooth is a groove-shaped cutting edge, and the cutting edge of the push tooth fitted to the groove-shaped cutting edge so as to be able to protrude and retract is angle-shaped. Since the top of the angled cutting edge is located at the center of the groove width of each of the grooved cutting blades, the light-weight grooved steel to be cut is fitted to the grooved cutting edge. When the angled cutting edge is sent toward the grooved cutting edge in this state, first, the top of the angled cutting edge tears the center of the bottom of the lightweight channel steel, and then advances to both sides from the center of the bottom to cut this portion. It will be cut sequentially. For this reason, the lightweight channel steel can be cut with little force without changing the direction of the cutter. The invention according to claim 2 is
Since the cross angle of the angled cutting edge is set to about 90 degrees, the load at the time of tearing the center of the bottom of the lightweight channel steel and the cutting load thereafter can be reduced, and the feed amount of the push teeth can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view showing a cut state of the lightweight channel steel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter 2 Receiving tooth 2a Plate 2b Spacer 3 Groove-shaped cutting edge (A) Gap 5 Pushing tooth 5a Arc piece 6 Angled cutting edge 6a Top α crossing angle 8 Support pin 10 First lever 11 Second lever 12 Lever pin 13 Feed mechanism 14 Engaging tooth 15 Feeding pawl 16 Pawl pin 17 Spring 18 Pull lever W Lightweight channel steel

Claims (2)

[Claims] 1. A receiving tooth (2) having a pair of groove-shaped cutting blades (3) facing each other while maintaining a predetermined gap (a), and fitted to the groove-shaped cutting blade (3) so as to be able to protrude and retract. A push tooth (5) having an angled cutting edge (6) is provided, and the receiving tooth (2) and the push tooth (5) are rotatably connected at one end side, respectively. The top (6a) of the angled cutting edge (6) is located at the center of the groove width of each of the grooved cutting edges (3), and the first lever (10) is integrally connected to the receiving teeth (2); A second lever (11) is rotatably connected to a base of the first lever (10), and a second lever (11) is provided between the second lever (11) and the pushing tooth (5). 1st lever (1
A lightweight channel steel cutter comprising a feed mechanism (13) for receiving said push tooth (5) and rotating in the direction of the tooth (2) when rotating in the direction (0). 2. The cross angle (α) of the angled cutting edge (6) is about 90.
2. The lightweight channel steel cutter according to claim 1, wherein the cutter has a degree.