JPH06297232A - Portable cutter - Google Patents

Abstract

PURPOSE:To eliminate the possibility that the next cutting work becomes impossible because a cutting edge bites into a screw bolt by arranging an engaging part in a swinging member so as to rotate the swinging member in the direction for a movable cutting edge to separate from a fixed cutting edge according to rotation of a cam. CONSTITUTION:A screw part of a continuous thread stud 33 is screw-fitted to a screw part formed in a fixed cutting edge 15, and a motor is rotated in this condition, and a cam 19 is rotated in the clockwise direction, and a swinging member 23 is rotated in the clockwise direction, and the continuous thread stud 33 is cut by a shearing action of the cutting edges 15 and 21. The motor 3 continues to rotate even after it is cut, and a pin 18 of the cam 19 engages with the first arm part 25 of a return plate 27, and rotates the swinging member inversely forcibly. As a result, the movable cutting edge 21 is separated from the fixed cutting edge 15, and the movable cutting edge 21 is opened by energizing force of a spring 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable cutting machine for cutting all-screw bolts, reinforcing bars, round bars, etc. at a building construction site.
It is an improvement of No. 26551. Hereinafter, the portable cutting machine of the present invention will be described as a bolt cutting machine that cuts a full-screw bolt whose shaft portion is entirely a screw.

[0002]

2. Description of the Related Art In the above-mentioned application, a motor driven by a storage battery rotates a rocking member via a plurality of reduction gears and a cam having a cam surface, and a movable member mounted on an end portion of the rocking member. We proposed a bolt cutting machine that cuts full-threaded bolts by the shearing action of a cutting blade and a fixed cutting blade. The swing member is constantly urged by a spring so that the swing member rotates in a direction in which the movable cutting blade moves away from the fixed cutting blade.

[0003]

It has been found that the above bolt cutting machine has the following problems. That is, after the completion of cutting, the threaded portions of the both cutting blades stick to the threaded portion of the full threaded bolt due to frictional force, and the urging force of the spring rotates the swing member to move the movable cutting edge from the full threaded bolt. It cannot be separated, and the next cutting work cannot be done. Also, if the capacity of the storage battery becomes low and the rotation of the rocking member stops during cutting, the cutting work may not be continued unless the storage battery is replaced, and the bolt cutting machine should be removed from all screw bolts that are about to be cut. There is also a risk that it will not be possible. An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a portable cutting machine in which the movable cutting blade is separated from the fixed cutting blade by a simple operation, thereby improving operability and reliability. That is.

[0004]

In order to achieve the above object, the present invention provides an engaging portion on the cam and at least two engaging portions for engaging the engaging portion on the swing member. ,
With the cooperation of these two engaging portions, the movable cutting blade rotates the swinging member as the cam rotates in the direction in which the movable cutting blade moves away from the fixed cutting blade.

[0005]

In the bolt cutting machine configured as described above, when the screw bolt and cutting blade bite after cutting the screw bolt and when the capacity of the storage battery decreases and the rotation of the swing member stops during cutting. Even if the cam is rotated normally or reversely, the cam engaging portion and the rocking member engaging portion are engaged with each other, and the rocking member is rotated in the direction in which the movable cutting blade moves away from the fixed cutting blade. As a result, the movable cutting blade is separated from the screw bolt, and the next cutting can be easily performed.

[0006]

1 to 10 showing an embodiment of the present invention.
Will be described with reference to. The housing 1 has an accommodating portion for accommodating a reduction gear, which will be described later, for decelerating the rotation of the motor 3, and a concave portion where the motor 3 is placed behind the accommodating portion. It is composed of a handle 13 and the like which has an opening for use and which houses the switch 9 and the like, forming a split housing.

The rotation of the motor 3 is a pinion shaft 2 connected to the motor rotation shaft, a planetary gear 5 that decelerates the rotation of the pinion shaft 2 and transmits it to the second pinion shaft 6, and a gear that meshes with the second pinion shaft 6. 7, a cam 19 via a gear 8 mounted on the shaft of the gear 7 and a gear 17 meshing with the gear 8
Be transmitted to. The shafts of the pinion shaft 2, the second pinion shaft 6 and the gears 7, 8 are the housing 1 and the gear cover 2 described later.
It is supported by bearings 4 mounted on 9. The gears 7 and 8 are provided vertically above the shaft center of the motor rotation shaft, and the cam 19 is positioned so that the shaft center thereof substantially coincides with the shaft center of the motor rotation shaft. The front end cam surface of the cam 19 is formed into a substantially fan shape, and the pin 18 constituting the engaging member of the present invention is provided on the front end cam surface end surface. A roller 20 that contacts the outer periphery of the front end cam surface of the cam 19.
Is rotatably supported on the lower end of the swing member 23. The swinging member 23 is rotatably attached to a fixing member 28 through a bolt 32 at a substantially central portion. The movable cutting blade 21 is attached to the swinging member 23 almost at the upper end through a screw 22. The fixed member 28 is fixed to a gear cover 29, and a fixed cutting blade 15 facing the movable cutting blade 21 is attached to the upper end of the fixed member 28 via a screw 16. The cam 19, the swinging member 23 and the like are housed in a gear cover 29 and a cover 31. A screw 2 is provided on the front surface of the swing member 23.
The return plate 27 is mounted via the connector 4, and the return plate 27 is rotatably supported by the bolt 32. Further, an opening is provided around the pin 18 of the cam 19 of the return plate 27, and the first arm portion 25 which constitutes the engaging portion of the present invention which engages with the pin 18 is provided on the right side and the lower side of the opening in FIG. The second arm portion 26 is provided. A spring 30 is provided between the upper part of the rocking member 23 and the gear cover 29. The spring 30 makes the rocking member 23 always move in the counterclockwise direction in FIG. 2, that is, in the direction in which the movable cutting blade 21 separates from the fixed cutting blade 15. It is biased to rotate.

In order to disconnect the all-screw bolt 33, the motor 3 is rotated and the cam 19 is rotated through the reduction gears 2, 5, 7, 8 and 17, and the swing member is urged by the spring 30. 2 is rotated counterclockwise in FIG. 2 to open the movable cutting blade 21. After the movable cutting blade 21 is opened, the rotation of the motor 3 is temporarily stopped (FIG. 2), and the screw portion of the fixed cutting blade 15 is screwed into the screw portion of the full screw bolt 33. By rotating 3 again, the cam 19 is rotated clockwise and the rocking member 23 is rotated clockwise, and the full screw bolt 33 is cut by the shearing action of the cutting blades 15 and 21 (FIGS. 3 and 4). ). The motor 3 continues to rotate even after cutting, and the pin 18 of the cam 19 engages with the first arm portion 25 of the return plate 27 to forcibly reverse the swing member 23 (FIG. 5). As a result, the movable cutting blade 21 separates from the fixed cutting blade 15, and the movable cutting blade 21 is opened by the urging force of the spring 30 (FIG. 2). One cycle is completed by stopping the rotation of the motor 3 after the movable cutting blade 21 is opened. By repeating the above, the full screw bolts 33 can be sequentially cut.

When the capacity of the storage battery 12 is reduced during cutting and the swinging member 23 does not move with the movable cutting blade 21 biting into the full screw bolt 33 (FIG. 6), the switch 9 is operated to the reverse rotation side. The motor 3 is rotated by the remaining capacity of the storage battery 12 to rotate the cam 19 counterclockwise, and the pin 18 of the cam 19 and the second arm portion 26 of the return plate 27 are rotated.
Are engaged (FIG. 7) and the stopped swinging member 23 is reversed to move the movable cutting blade 21 away from the fixed cutting blade 15, that is, the full screw bolt 33. That is, the movable cutting blade 21 can be separated from the full-screw bolt 33 by a simple operation of reversing the motor 3.

FIGS. 9 and 10 show the periphery of the switch 9. FIG. 9 shows a state in which the switch 9 is operated in the reverse rotation direction against the spring 41 by the forward / reverse switching lever 40, and FIG. The state in which the reverse switching lever 40 is returned to the forward rotation side by the spring 41 is shown. When the trigger lever 42 shown in FIG. 1 is operated while the forward / reverse switching lever 40 is pushed to the reverse rotation side as shown in FIG. 9, the motor 3 rotates in the reverse rotation direction. Motor 3
When the movable cutting blade 21 is separated from the fixed cutting blade 15 by the reverse rotation of 1 and the normal / reverse switching lever 40 is released in this state, the normal / reverse switching lever 40 returns to the normal rotation side by the spring 41. Therefore, unless the forward / reverse switching lever 40 is operated, the motor 3
Always rotates in the normal direction, so that there is no risk of problems such as locking of the motor 3 due to reverse rotation of the swinging member 23, and accidents such as damage to the body of the portable cutting machine are prevented. be able to. Further, since the switch 9 is always on the forward rotation side and never on the reverse rotation side, the operation of the switch 9 is facilitated and the operability is improved.

[0011]

As described above, according to the present invention, after the end of cutting, the swinging member is reversed to move the movable cutting blade away from the screw bolt, so that the cutting blade bites the screw bolt and the next cutting is performed. There is no fear of losing work. Further, even when the capacity of the storage battery is reduced and the battery is stopped during cutting, the movable cutting blade can be separated from the screw bolt by a simple operation of reversing the motor, and there is no fear of reducing the cutting efficiency. And so on.

[Brief description of drawings]

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

FIG. 2 is a side view showing a state in which a cover is removed in FIG.

FIG. 3 is a side view of an essential part showing the start of cutting.

FIG. 4 is a side view of an essential part showing the end of cutting.

FIG. 5 is a side view of an essential part showing a state in which the swing member starts to rotate in the reverse direction after cutting is completed.

FIG. 6 is a side view of an essential part showing a state in which the swing member is stopped in the middle of cutting and the swing member is started to rotate in the reverse direction.

FIG. 7 is a side view of an essential part showing a state in which the swing member has started reverse rotation in FIG. 6;

FIG. 8 is a side view of an essential part showing a state in which the swing member is reversed in FIG.

9 is a side view showing the vicinity of the switch of FIG. 1 and showing a state in which the switch is operated to the reverse rotation side.

FIG. 10 is a side view showing the periphery of the switch of FIG. 1 and showing a state where the switch is operated in the forward rotation side.

[Explanation of symbols]

3 is a motor, 9 is a switch, 12 is a storage battery, 15 is a fixed cutting blade, 18 is a pin, 19 is a cam, 21 is a movable cutting blade,
23 is a rocking member, 27 is a return plate, and 25, 26.
Is an arm of the return plate 27, 28 is a fixing member, 29
Is a gear cover, 30 is a spring, and 33 is a full screw bolt.

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[Procedure amendment]

[Submission date] April 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable cutting machine for cutting materials such as full-screw bolts, reinforcing bars and round bars at a building construction site. This is an improved version of Japanese Patent Application No. 5-26551. Hereinafter, the portable cutting machine of the present invention will be described as a bolt cutting machine that cuts a full-screw bolt whose shaft portion is entirely a screw.

Claims (3)

[Claims] 1. A motor, a plurality of reduction gears for reducing the rotation of the motor, a cam rotated through the reduction gears and having a fan-shaped cam surface, and a swing oscillated by the cams. A member, a movable cutting blade attached to the end of the swinging member, a fixed cutting blade that is attached to a fixed member facing the movable cutting blade, and cuts a screw bolt by a shearing action with the movable cutting blade. A portable cutting machine having: a cam, which engages with an engaging portion provided on the cam, and rotates the swinging member in a direction in which the movable cutting blade separates from the fixed cutting blade in accordance with rotation of the cam. A portable cutting machine characterized in that at least two engaging portions are provided on a swing member. 2. The portable cutting machine according to claim 1, wherein the motor is a reversible motor, and the reversible motor is rotated in reverse to separate the movable cutting blade from the fixed cutting blade. 3. A switch for controlling the operation and stop of the reversible motor is a switch capable of forward / reverse switching, and a spring for constantly biasing a forward / reverse switching lever of the switch to a forward rotation side is provided. The portable cutting machine according to claim 2.