JP2008173747A - Cutoff device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutoff device minimizing resistance to a blade of a circular saw, having the circular saw available for a long time, and preventing damage of the blade of the circular saw. <P>SOLUTION: The circular saw 13 draws a circular arc moving locus and abuts on a square pipe W from obliquely above the square pipe to start cutting of the square pipe W. Since the circular saw 13 abuts from a square part Wa, the number of blades of the circular saw 13 simultaneously slid on the square pipe W is extremely few. Resistance to the blade of the circular saw M is then minimized, and also generation of frictional heat is suppressed. The blade is hardly worn in a short period of time, therefore, and deterioration of the blade by the frictional heat is also suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cutting device, and more particularly, to a cutting device that is supported by a swinging portion in which a circular saw swings and moves close to and away from a member to be cut.

In this type of cutting device, a circular saw that is driven to rotate is supported by a swinging portion, and a handle is attached to the swinging portion. Then, after placing the member to be cut on the base and clamping with a vise, grasping the handle and pushing down, swinging the swinging portion downward, pressing the circular saw against the member to be cut, Is disconnected.
In the conventional cutting device, the rocking center of the rocking part is close to the upper surface of the base, and the rotation center of the circular saw is located above the rocking center. For this reason, as shown in FIG. 7, the circular saw M comes into contact with the square pipe W as a member to be cut almost directly above.

Thus, in the conventional cutting apparatus, since the circular saw M abuts from almost directly above the member to be cut W, the range of contact of the blades of the circular saw M is large, and a large number of blades are in sliding contact with the member to be cut almost simultaneously. become. For this reason, the resistance applied to the blade of the circular saw M is large, and the blade is worn out in a short time or deteriorated due to frictional heat, and there is a problem that the circular saw does not last long. In addition, if the resistance applied to the blade of the circular saw M is large, the blade is damaged, and there is a risk that the broken piece may hit the operator.
The present invention has been made by paying attention to the above-mentioned conventional problems, and can reduce the resistance applied to the blade of the circular saw as much as possible, and can prevent the circular saw from lasting and being damaged. The object is to provide a cutting device.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The invention of claim 1 is directed to a base on which a member to be cut is placed, a shaft rotatably supported on the base, and a rotational drive. In a cutting apparatus having a circular saw, a support part protruding from the base and a support part swingably supported by the support part and moving toward and away from a member to be cut mounted on the base The circular saw is rotatably supported by the swinging portion. When the swinging portion is moved in a direction close to the member to be cut, the circular saw is circular with respect to the member to be cut. The cutting device is characterized by drawing an arcuate movement trajectory and abutting obliquely from above.

  According to a second aspect of the present invention, in the cutting apparatus according to the first aspect, the swing center of the swing portion is located on the front side of the member to be cut mounted on the base, and the rotation center of the circular saw is mounted on the base. It is a cutting device characterized by being located on the rear side of the placed member to be cut.

  A third aspect of the present invention is the cutting apparatus according to the first or second aspect, further comprising a pair of steadying members arranged with a slight gap with respect to both side surfaces of the circular saw. It is.

  According to a fourth aspect of the present invention, in the cutting apparatus according to the third aspect, the swinging portion is provided with a safety cover that covers a part of the circular saw, and a steadying member is attached to the safety cover. Cutting device.

According to the cutting device of the present invention, the resistance applied to the blade of the circular saw can be reduced as much as possible, the circular saw can last longer, and the replacement time of the circular saw can be extended, which is economical.
In addition, it is possible to prevent the circular saw blade from being damaged during cutting, and to improve the safety of the operator.

A cutting device 1 according to an embodiment of the present invention will be described with reference to the drawings.
In the following description, the left side in FIGS.
Reference numeral 3 denotes a base, and the base 3 is provided with a vise 5 for clamping a square pipe W which is a member to be cut. Further, a support portion 7 protruding upward is fixed on the base 3, and a base end portion of the support portion 7 is located in front of the vice 5. The support portion 7 extends obliquely rearward from the midway portion, and the tip portion thereof reaches above the vice 5.

  A swinging portion 9 is swingably supported by a shaft 11 at the distal end portion of the support portion 7, and the swinging portion 9 is formed integrally with the base portion 9 a and the base portion 9 a and extends downward. It is comprised by the installation part 9b. A handle 12 is attached to the base 9a, and the handle 12 protrudes rearward of the base 9a. Further, on the upper surface of the base portion 9a, there is provided a motor 15 for rotationally driving a circular saw 13, which will be described later, and a power transmission mechanism 18 comprising a pulley, a belt and the like.

A circular saw 13 is rotatably supported by a shaft 17 at the lower end portion of the extending portion 9b, and the driving force of the motor 15 is transmitted to the circular saw 13 by the power transmission mechanism 18, and the circular saw 13 is rotationally driven. It is like that. The circular saw 13 is a so-called tip saw having a carbide blade.
The shaft center of the shaft 11 that pivotally supports the rocking portion 9, that is, the rocking center 11 a of the rocking portion 9 is located on the front side of the square pipe W that is placed on the base and held by the vice 5. Further, the shaft center of the shaft 17 supporting the circular saw 13, that is, the rotation center 17 a of the circular saw 13 is located on the rear side of the square pipe W placed on the base and held by the vice 5.

A safety cover 19 is attached to the extended portion 9b, and the safety cover 19 covers almost the upper half of the circular saw 13. A pair of steadying members 21 are attached to the safety cover 19. The steady member 21 is made of a polytetrafluoroethylene-based synthetic resin having a small friction coefficient. A hole is formed in the center of the steadying member 21.
The support mechanisms 23 and 25 that support the steadying member 21 will be described. Since the support mechanisms 23 and 25 are symmetrical, only the left support mechanism 23 will be described in FIGS. 4 and 5, and the right support mechanism 25 will be denoted by the same reference numerals as those of the support mechanism 23, and the description thereof will be omitted. .

  Reference numeral 27 denotes a pipe. The pipe 27 is inserted and fixed in a hole formed in the side plate 19 a of the safety cover 19. A male screw member 31 is inserted through the pipe 27, and one end portion of the male screw member 31 protrudes to the inside of the side plate 19a, and the other end portion protrudes to the outside. An anti-sway member 21 is fitted to one end of the male screw member 31, and a nut 29 is screwed to one end of the male screw member 31, and the nut 29 is in contact with the anti-sway member 21. A coil spring 32 is fitted between the nut 29 of the male screw member 31 and the pipe 27. Two nuts 33 and 35 are screwed to the other end of the male screw member 31.

Next, the operation | work which cut | disconnects the square pipe W with this cutting device 1 is demonstrated.
First, the square pipe W is placed on the base 3 and fixed by the vise 5. And the motor 15 is operated and the circular saw 13 is rotationally driven. Next, the handle 12 is grasped and pushed down from the state shown in FIG. 1, and the swinging portion 9 is swung together with the circular saw 13 to the state shown in FIG. Thereby, the square pipe W is cut by the circular saw 13.

  As described above, the swing center 11a of the swing portion 9 is located on the front side of the square pipe W placed on the base, and the rotation center 17a of the circular saw 13 is located behind the square pipe W placed on the base. Since the circular saw 13 is located on the side, the circular saw 13 comes into contact with the square pipe W obliquely from above and draws an arcuate movement trajectory R, and the cutting of the square pipe W is started. Thus, since the circular saw 13 abuts from the corner portion Wa, the number of blades of the circular saw 13 that comes into sliding contact with the square pipe W almost simultaneously is extremely small. For this reason, resistance applied to the blade of the circular saw M is small, and generation of frictional heat is also suppressed. Therefore, the blade is not easily worn in a short time, the deterioration of the blade due to frictional heat is suppressed, and the circular saw can be made long lasting. That is, a larger number of square pipes W can be cut with a single circular saw than before. Further, since the resistance applied to the circular saw 13 can be suppressed, the blade can be prevented from being damaged, and the danger that the fragments hit the operator can be avoided, thereby making it possible to improve the safety of the operator. It becomes.

In the cutting device 1, the circular saw 13 draws an arcuate movement trajectory R and comes into contact with the square pipe W obliquely from above, so that the swing center 11a of the swing portion 9 is higher than the conventional cutting device. Will be placed. For this reason, there is a possibility that the circular saw 13 vibrates and shakes. However, since the steady member 21 is provided, when the circular saw 13 tries to vibrate, the side surface of the circular saw 13 is steady. The sliding of the member 21 can be prevented. Therefore, accurate cutting is always possible, and it is possible to prevent the cut surface from being rough.
In order to adjust the gap between the steady rest member 21 and the side surface of the circular saw 13, the nut 29 is turned to guide the steady rest member 21 to the male screw member 31, so that Operate in the direction of separation.

The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
For example, the circular saw used may be other than a tip saw. Of course, the member to be cut may be a round pipe, an angle, a plate or the like in addition to the square pipe.

  The cutting device of the present invention can be used for cutting work of an ironworker, and can be widely used in factories such as ironworks, construction sites, and the like.

It is a side view in the state where the rocking | fluctuation part of the cutting device which concerns on embodiment of this invention exists in a raise position. It is a side view in the state where the rocking | fluctuation part of the cutting device of FIG. It is a front view of the state which has the rocking | swiveling part of the cutting device of FIG. FIG. 2 is an enlarged perspective view of the vicinity of a steady member of the cutting device of FIG. 1. It is a partial front view of the vicinity of the steadying member of the cutting device of FIG. It is a figure which shows a mode that the circular saw of the cutting device of FIG. 1 contact | abuts from the corner | angular part of a square pipe. It is a figure which shows a mode that the circular saw of the conventional cutting device contact | abuts from the corner | angular part of a square pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 3 Base 5 Vise 7 Support part 9 Oscillating part 9a Base part 9b Extension part 12 Handle 13 Circular saw 15 Motor 18 Power transmission mechanism 11 Axis 11a Oscillating center 17 of oscillating part 17 Axis 17a Rotating center 19 of circular saw Safety cover 19a Side plate 21 Anti-sway member 23, 25 Support mechanism 27 Pipe 29 Nut 31 Male thread member 32 Coil spring 33, 35 Nut M Circular saw W Square pipe Wa Corner part R Arc-shaped movement locus

Claims (4)

  In a cutting apparatus having a base on which a member to be cut is placed, and a circular saw that is rotatably supported on the base and is driven to rotate, a support portion that protrudes from the base; A swinging portion that is pivotally supported by the supporting portion and is movable in a direction approaching and separating from a member to be cut mounted on the base, and the circular saw is rotatably supported by the swinging portion. The cutting device is characterized in that when the swinging portion is moved in a direction close to the member to be cut, the circular saw comes into contact with the member to be cut from an obliquely upward direction while drawing an arcuate movement locus.   2. The cutting apparatus according to claim 1, wherein the swinging center of the swinging portion is located on the front side of the member to be cut placed on the base, and the rotation center of the circular saw is on the member to be cut placed on the base. A cutting device located on the rear side.   The cutting device according to claim 1 or 2, further comprising a pair of steadying members arranged with a slight gap with respect to both side surfaces of the circular saw.   4. The cutting apparatus according to claim 3, wherein a safety cover that covers a part of the circular saw is provided on the swinging portion, and a steadying member is attached to the safety cover.

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