JP3036674U - cutter - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To reduce the cutting depth of a workpiece and the limitation of the size of the workpiece. A motor (3) connected to a rear end of a housing (1),
An intermediate shaft 14 bearing in the housing 1 and rotating in synchronization with the motor 3, a bearing orthogonal to the intermediate shaft 14 at the tip of the housing 1, and rotating in conjunction with this,
Output shaft 1 with a cutter disk 4 detachably attached to the tip
5, a fixed cover 5 on the side of the front end portion of the housing 1 that is fixed around the output shaft 15, covers the rear side of the cutter disk 4, and is rotatably arranged around the output shaft 14. A movable cover 6 that is guided to move toward the inside of the fixed cover 5 on the leading side in the rotation direction of the cutter 4,
An output shaft 16 for a fan which is axially received at an intermediate position of the intermediate shaft 14 and projects through the rear portion of the fixed cover 5.
And a dust collecting fan 23 connected to the protruding end of the output shaft 16,
A fan casing (7) fixed to the rear side surface of the fixed cover (5) and covering the periphery of the fan (23) is provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cutter for cutting concrete, stones, bricks, metal and other pipes, and more particularly to a handy type cutter with enhanced safety functions.

[0002]

[Prior art]

 As a cutter for cutting concrete, stone materials, bricks, metal and other pipes, it is known to apply a circular saw-shaped cutter disk to the material for cutting, and it is a stationary type used in factories etc. And there is a portable handy type cutter. The present invention relates to an improvement of a handy type cutter.

In this type of cutter, a cover is provided around the cutter disk to ensure safety. However, handy type cutters are highly dangerous due to their portability and require more careful handling.

In other words, in the stationary type, since the cutter performs the cutting operation by fixing the workpiece to the cutting position and pushing down the handle in a lever type, the operation is stable, but the handy type cutter uses the cutter. Since the whole work is held in hand and the cutter disk is pressed against the object to be cut, there is no operation reference point and the operation is unstable, which increases the risk.

In order to avoid such a danger, it is preferable to increase the circumference of the cover and reduce the exposed portion of the cutter for improving safety. However, in this case, the following problem is caused. was there.

[0006]

That is, when the circumference of the cover is large, the exposed circumference of the cutter disc is reduced by the surrounding circumference, and the cutting depth of the work to be cut and the The size of the work piece will be limited.

[0007] For example, when used for cutting concrete or stone, there is no problem due to the dust that is discharged because the stationary type has a dedicated discharge device, but in the case of a handy type, there is no problem due to dust. There was a health hazard to workers and there was a problem with dust disposal.

The present invention solves the above problems and provides a cutter capable of relaxing the restrictions on the cutting depth and the size of the object to be cut while ensuring safety. Is intended.

A second object of the present invention is to prevent the influence of discharged cutting chips on the operator, which is a problem of the handy type cutter.

A third object of the present invention is to make it possible to obtain sufficient operational stability even though it is a handy type.

A fourth object of the present invention is to provide a cutter that is small and lightweight, has a compact mechanism, and is highly portable.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, a device according to claim 1 of the present invention is a drive motor connected to a rear end of a housing, and an intermediate shaft which is supported by a bearing in the housing and rotates in association with the drive motor. An output shaft for a cutter, which is supported on the front end side of the housing at right angles to the intermediate shaft, rotates in conjunction with the intermediate shaft, and has a cutter disk detachably attached to the front end, and the front end of the housing. A safety fixed cover that is fixedly placed around the cutter output shaft on the side surface of the part and covers the periphery of the rear side of the cutter disk, and can rotate coaxially with the cutter output shaft around this. And a movable cover that is guided to the inside of the fixed cover on the advance side in the rotation direction of the cutter, and an intermediate position of the intermediate shaft. A fan output shaft that is supported by a bearing orthogonal to this and projects through an intermediate position of the housing and the rear portion of the fixed cover, and a dust collection fan that is coupled to the protruding end of the fan output shaft. The fan cover is fixed to a rear side surface of the fixed cover to cover the periphery of the fan, one end of the fixed cover is connected to the inside of the fixed cover, and a fan casing having a discharge pipe protruding from the rear portion is provided. The "drive motor" referred to in the present invention includes an electric motor, a pneumatic motor, or a prime mover driven by fuel. According to the first aspect of the present invention, when the cutting depth of the cutter disc is shallow, the movable cover cooperates with the fixed cover to largely surround the periphery of the cutter disc, and the movable depth increases as the cutting depth of the cutter disc increases. The cover retracts and is stored inside the fixed cover, expanding the cutting range of the cutter disc. According to a second aspect of the present invention, the movable cover according to the first aspect is constantly urged by the spring means from the opening of the fixed cover toward the protruding side, and the protruding position is regulated by the guide stopper. It is characterized by According to the second aspect of the invention, the movable cover can be automatically moved back and forth according to the cutting depth of the cutter disk with a simple structure. According to a third aspect of the invention, the shape of the tip portion of the movable cover in the invention according to the first or second aspect of the present invention is such that the tip end shape with respect to the advance direction in the rotation direction with respect to the axis connecting the shaft center and the tip portion of the cutter output shaft. It is characterized in that it is formed in a curved arc shape. The movable cover retracts because the open end of the cover touches the edge of the object to be cut and receives a downward force of the cutter disk. In the device according to the third aspect, the curved surface of the tip portion makes smooth contact with the edge, and the cover margin can be slightly increased by the curved portion. The invention according to claim 4 is the invention according to claim 1, characterized in that an installation leg portion that also serves as a fulcrum portion for cutting is provided on the lower side of the fixed cover. In the device according to the fourth aspect, the fulcrum position can be secured during the cutting work, and the operation can be more stabilized. A fifth aspect of the present invention is characterized in that, in the first or second aspect of the invention, a handle is provided on an upper side of the fixed cover. In addition to the fulcrum position, the action point can be arranged at a safe position. According to a sixth aspect of the present invention, in the device according to any one of the first, fourth and fifth aspects, the drive motor is housed in a motor housing, and a handle is provided on an upper portion of the motor housing. Is equipped with a trigger button that serves as a drive motor switch. In the invention according to claim 6, the fulcrum of claim 4 and the handle which is the point of action in claim 5 constitute the other supporting the cutter with both hands, and the motor drive adjustment can be performed by the trigger button. According to a seventh aspect of the present invention, in the first aspect, the intermediate shaft and each output shaft are connected to each other through a bevel gear. In the device according to the seventh aspect, it is possible to obtain a reliable power transmission system with a simplified housing shape, a small size and a light weight. The invention according to claim 8 is characterized in that, in the invention according to claim 1, the pipe of the fan casing can be connected to the dust collecting bag through a removable hose. In the invention according to claim 8, since dust such as cutting dust is sucked into the dust bag from the inside of the cover through the fan, there is no health damage to the worker and the surroundings due to the cutting dust, Post-processing of cutting powder will also be performed automatically.

[0013]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of an electric cutter according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In FIG. 1, the electric cutter is fixed to a main housing 1, an electric motor 3 fixedly arranged at a rear end of the housing 1 and housed in a motor housing 2, and a side surface of the housing 1. A fixed cover 5 for safety that surrounds the rear part of the cutter disk 4, a movable cover 6 for safety that is arranged on the lower end side of the fixed cover 5, that is, on the advance side of the cutter disk 4 in the rotation direction, The fan casing 7 fixed to the rear side surface of the cover 5, the installation leg 8 provided in the lower portion of the fixed cover 5, the first grip 9 also fixed in the upper portion, and the upper portion of the motor housing 2 are provided. The second handle 10 and the second handle 10 are provided.

In the housing 1, an intermediate shaft 14 is supported in parallel with a pinion 11 integral with a motor shaft projecting to the rear side via a rear gear 12, and a head portion 1 a of the intermediate shaft 14 at the tip end side of the intermediate shaft 14. It is located at an intermediate position between the output shaft 15 for the cutter, which is orthogonally supported by the bearing, and protrudes from the front end side surface of the housing 1, and the intermediate shaft 14, and one end thereof is orthogonal to the intermediate shaft 14 on the side surface of the housing 1. An output shaft 16 for a fan, which is supported by a bearing and which has the other end protruding through the rear portion of the fixed cover 5 and is supported in the center of the inside of the fan casing, is arranged.

The intermediate shaft 14 and the output shaft 15 are connected to each other via bevel gears 17 and 18, and similarly, the intermediate shaft 14 and the output shaft 16 are also connected to bevel gears 19 and 20. The rotation is transmitted to the respective output shafts 15 and 16 at a rotation speed corresponding to each gear ratio.

That is, since the output shaft 15 is for cutting, it has a high torque and low rotation gear ratio, and since the output shaft 16 is for fan rotation, it has a low torque and high rotation gear ratio. It is set.

At the tip of the output shaft 15, the cutter disk 4 is sandwiched by a pair of attachment fittings 21, and the fitting bolts 22 screwed into the screw holes provided at the tip of the output shaft 15 tighten the space between the fittings 21. The disk 4 is detachably fixed to the output shaft 15, and the rotation of the disk 4 rotates the cutter disk 4 in the clockwise direction indicated by the arrow in FIG.

An axial fan 23 is attached to the tip of the output shaft 16, and the rotation of the fan 23 causes an air intake opening 5a opened on the rear side surface of the fixed cover 5 as shown by an arrow in FIG. The air is sucked and blown toward the exhaust pipe 24 side protruding to the rear part of the fan casing 7.

The lower sides of the fixed cover 5 and the movable cover 6 are formed into a gentle curved surface R shape that curves toward the advancing side of the cutter 4 in the rotation direction, thereby smoothing the contact with the workpiece. With the curved shape, the outermost end of the tip is located slightly on the outer peripheral side of the cutter 4 to slightly expand the cover range. The mounting relationship between the fixed cover 5 and the movable cover 6 is shown in detail in FIGS. 1 and 2 and FIG. 3 in addition to this. In the figure, the fixed cover 5 is fitted into a boss portion 25 protruding from the head portion 1a of the housing 1, and is fixed by a fixing screw or the like.

An arm 26 is integrated at the tip of the movable cover 6, and the movable cover 6 can be rotated around the output shaft 14 by rotatably fitting the arm 26 to the boss portion 25.

A hook 27 is provided at the tip of the arm 26, and a tension spring 29 is interposed between the hook 27 and a pin 28 provided on the inner surface of the fixed cover 6 so that the movable cover 6 is always projected from the fixed cover 5. It is biased to the side.

On the other hand, an arc-shaped guide groove 30 is cut in the arm 26, and a stopper pin 31 protruding from the inner surface of the fixed cover 6 is engaged with the guide groove 30 to regulate the maximum protruding position of the movable cover 6. doing.

The installation leg portion 8 and the first handle 9 are bent pipe products, and can be fixed to the mounting projections 32 integrally projecting on both sides of the fixed cover 5 with bolts or the like. I am sorry. The outer periphery of the installation leg 8 is covered with a cover 33 made of an elastic material such as plastic to provide cushioning to the contact side when it serves as a fulcrum during installation or work.

The second handle 10 is made of a plastic molded product or the like, and has a front end connected to an upper end of the motor housing 2 and a rear end connected to a rear portion of the motor housing 2. A connection cord 35 for the motor 3 is led out from the rear end of the handle 10, and a trigger button 36 serving as a motor switch is arranged on the rear side.

Further, a bellows type hose 37 is detachably fitted to the rear portion of the fan casing 7. The other end of the hose 37 is connected to a dust collecting bag 38 described later.

Therefore, when cutting an object to be cut with the electric cutter having the above-described configuration, as shown in FIG. 4A, first, the hose 37 and the dust collecting bag 38 are connected to the device, and one hand is used. Then, the first grip 9 is held and the second grip 10 is held with one hand, and the leg 8 is installed on the ground plane in the vicinity of the work W to be used.

Then, while operating the trigger button 36, both hands are operated in order to cut the workpiece W, and the apparatus is advanced while moving forward. At this time, the device tilts forward with the legs 8 as fulcrums.

When the cutting depth of the workpiece W becomes deeper, as shown in (b), the leading edge of the movable cover 6 hits the workpiece W, and the forward inclination is further deepened from this state to further increase the movable cover 6 Can move backward to widen the cutting range of the cutter disk 4.

When the electric cutter is separated from the workpiece W after finishing the work, the elasticity of the spring 29 causes the movable cover 6 to return to the maximum protruding position, so that the cover range can be expanded again, and the cutter disk 4 can be continuously extended. It is possible to prevent unexpected accidents caused by.

Further, the dust generated by cutting is collected in the dust bag 38 by the drive of the fan 23 and is not scattered to the outside, which is beneficial to the health of the worker and may also accumulate around the cut edge. Since there is no cut, it is easy to check the cut end.

[0033]

[Effect of the invention]

 As is apparent from the above description, the present invention has the following effects. When the cutting depth of the cutter disc is shallow, the movable cover cooperates with the fixed cover to largely surround the periphery of the cutter disc, and as the cutting depth of the cutter disc increases, the movable cover retracts and the fixed cover moves. Since it is housed inside and the cutting range of the cutter disk can be expanded, safety is greatly improved without affecting the cutting range. It is possible to prevent the discharged cutting waste from affecting the worker. Since the fulcrum part and the force point part are determined for each, it is possible to obtain sufficient operational stability even though it is a handy type and to improve the safety. Since the motor power is distributed between the cutter rotation and the fan drive by the gear mechanism, it is compact and lightweight, and the mechanism is compact and highly portable.

[Brief description of the drawings]

FIG. 1 is a side view of an electric cutter according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded view of the vicinity of a fixed cover.

4 (a) and 4 (b) are explanatory views showing a usage state of the working electric cutter.

[Explanation of symbols]

 1 Main Housing 2 Motor Housing 3 Electric Motor 4 Cutter Disc 5 Fixed Cover 6 Movable Cover 7 Fan Casing 8 Installation Leg 9 First Handle 10 Second Handle 14 Intermediate Shaft 15 Cutter Output Shaft 16 Fan Output Shaft 17, 18, 19, 20 Bevel gear 23 Axial fan 29 Extension spring 30 Guide groove 31 Stopper pin 36 Trigger button

Claims (8)

[Utility model registration claims] 1. A drive motor connected to a rear end of a housing, an intermediate shaft bearing-supported in the housing, and rotating in association with the drive motor, and a drive shaft orthogonal to the intermediate shaft at a front end side of the housing. It is supported by a bearing and rotates in conjunction with the intermediate shaft, and the cutter output shaft has a cutter disk detachably attached to the tip, and is fixedly arranged around the cutter output shaft on the side of the tip of the housing. A fixed cover for safety that covers the periphery of the rear side of the cutter disk, and a fixed cover that is rotatably arranged coaxially with the output shaft for the cutter around the output shaft for the cutter and on the advance side in the rotation direction of the cutter. One movable cover which is guided to move toward the inside of the cover, and bearing-supported at an intermediate position of the intermediate shaft orthogonally thereto,
An output shaft for the fan that penetrates through the intermediate position of the housing and the rear portion of the fixed cover, a dust collecting fan that is connected to the protruding end of the output shaft for the fan, and is fixed to the rear side surface of the fixed cover. To cover the periphery of the fan and communicate one end with the inside of the fixed cover,
A cutter having a fan casing having a discharge pipe protruding at a rear portion thereof. 2. The movable cover is constantly urged toward the projecting side from the opening of the fixed cover by spring means, and its projecting position is regulated by a guide stopper. Cutter. 3. The shape of the tip of the movable cover is formed in an arc shape that curves toward the advance side in the rotational direction with respect to the axis connecting the axial center of the cutter output shaft and the tip. The cutter according to claim 1, which is characterized in that. 4. The cutter according to claim 1, wherein an installation leg portion which also serves as a fulcrum portion for cutting is provided on the lower side of the fixed cover. 5. The cutter according to claim 1, wherein a handle is provided on an upper side of the fixed cover. 6. The drive motor is housed in a motor housing, and a handle is provided on an upper portion of the motor housing, and a trigger button serving as a switch of the drive motor is disposed on the handle. The cutter according to any one of Items 1, 4 and 5. 7. The cutter according to claim 1, wherein the intermediate shaft and each output shaft are connected to each other via a bevel gear. 8. The cutter according to claim 1, wherein the pipe of the fan casing can be connected to the dust collecting bag via a removable hose.