JP3136457U - Provided with a dust collection function, a vertical saw with high vertical accuracy, hard to damage the finishing material, and excellent holdability. - Google Patents

Abstract

The present invention provides a circular saw equipped with a self-dust collecting function that does not require a dust collector, a circular saw that does not easily damage the finishing material, and a saw that can be handled safely even by a left-handed person.
Air for cooling motors is sent to a saw blade housing 10 and discharged from an exhaust port 1 at the rear of the housing. Sawdust passes through a dedicated space to the exhaust outlet 1 at the rear of the housing due to the centrifugal force of the saw blade, and is passed through a dust collection filter that is attracted by the cooling air and connected to the exhaust outlet 1 along the way. Efficient collection of sawdust by obtaining pressure (dynamic pressure + static pressure). The 45-degree tilt function, which is less frequently used, is removed, and vertical accuracy is improved and building material pressers are provided. A movable sub-handle is provided to make it possible to work in a comfortable posture according to the left-handed person and the work situation.
[Selection] Figure 2

Description

  This invention is equipped with a dust collection function on a conventional circular saw that had to be equipped with an external dust collector. It is related to the circular saw that is difficult to damage the finishing material and can be handled safely even by left-handed people.

  Sawdust generated when cutting building materials scatters to the surroundings, causing the working environment to deteriorate, and cleaning work after the completion of the work is also difficult. Conventionally, it is necessary to attach a dust collector and connect it with a hose, and work efficiency is poor.

  Vertical accuracy has been sacrificed because of the 45-degree tilt function that is less frequently used. Further, since it is necessary to widen the opening width 18 of the base, there is a concern that the finishing material is turned over.

  There are few left-handed products. Depending on the direction of cutting, it must be an unreasonable posture.

  We devise a circular saw that can collect single saws without using a dust collector, a circular saw that does not easily damage the finishing material, and a circular saw that can be handled safely even by left-handed people.

  An exhaust port 1 is provided behind the saw blade housing 10, and a commercially available vacuum cleaner dust pack 33 is connected to the exhaust port 1 via a dedicated rubber adapter 27. (Refer FIG. 13) The sawdust generated by the cutting of the building material is efficiently collected by the rotation of the blower 14 and the saw blade. When a more reliable dust collection capability is required, a dust collector can be connected to the exhaust port 1 as usual.

  The 45-degree tilt function that is not frequently used is removed to improve vertical accuracy. Furthermore, when the building material pressing portion 18 of the base is extended to the edge of the saw blade and the building material is cut, the finished surface is prevented from being turned over.

  A mast 19 for a sub handle is provided on the base surface, and a movable sub handle 8 which can be turned in three directions (90 degrees, 0 degrees, -90 degrees) is attached.

  Since the stagnation part of the air is reduced inside the saw blade housing 10, saw dust does not collect inside compared to the conventional product. No need for finishing. It is safe because you do not have to work in an unreasonable posture.

  A circular saw to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a plan view to which the present invention is applied. The movable sub handle 8 can be parallel to the motor to wind the power cord. Since the cord reel guide 7 is provided, the cord does not have to be separated. When the movable sub handle 8 is twisted to the left, the connecting portion with the mast is loosened, and the direction of the sub handle can be freely changed. The sub handle connecting portion of the mast 19 has dents at three positions of 90 degrees, 0 degrees, and -90 degrees. When the sub handle is twisted to the right, the tip of the screw enters the dent and can be fixed securely.

  FIG. 7 is a cross-sectional view when cutting a building material. The safety cover 21 is in the saw blade housing 10. Sawdust passes between the saw blade housing 10 and the safety cover 21, and the guide vane 25 extending from the lower portion of the exhaust port 1 discharges the sawdust to the exhaust port 1 side. Radial slits 31 inserted into the disk surface of the saw blade generate a centrifugal force in the surrounding air, and the surrounding air with the centrifugal force flows through the linear slit 24 of the safety cover 21 and flows into the exhaust port 1.

  FIG. 8 is a cross-sectional view of the state where the safety cover 21 is lowered and the saw blade is stopped. The air sent from the blower 14 incorporated in the circular saw body is taken into the saw blade housing 10 from the air passage 9 and exhausted to the exhaust port 1.

Top view looking down from the top Top view cut horizontally at the center Base plan Right side view Left side view The state of cutting the plate with ears using the plate as a ruler as seen from the rear Sectional view when cutting Sectional view with safety cover down Figure of the dedicated adapter when using the vacuum cleaner garbage pack Check valve shape of the adapter Figure of 45 degree bend for exhaust Figure of saw blade with radial slits Vacuum cleaner trash pack and dedicated adapter connected

Explanation of symbols

1 Exhaust port (dust collector connection)
2 Cutting depth scale and height holding slider 3 Lock lever for height holding slider 4 Parallel ruler set screw 5 Power cord 6 Power cord wound state 7 Power cord reel guide / intake funnel 8 Movable sub handle 9 Cooling Air exhaust port 10 Saw blade housing 11 Power supply base chamber 12 Cooling intake port 13 Bearing 14 Blower 15 Deceleration mechanism, brake 16 Cut-off side position 30 mm
17 Uncut side position 100mm
18 Construction material presser (prevents turning)
19 Movable Sub Handle Mast 20 Parallel Ruler 21 Safety Cover with Ventilation Slit 22 Ruler Substrate Plate 23 Saw Waste Passing Space 24 Exhaust Slit 25 Exhaust Guide Vane 26 Round Saw Connection Port 27 Dust Pack Adapter for Vacuum Cleaner (Rubber)
28 Dust pack mount fixing groove 29 Same as above Check valve 30 45 degree bend for exhaust (made of rubber)
31 Radial slit 32 Garbage pack fixing mount 33 Garbage pack for vacuum cleaner

  The present invention relates to a circular saw excellent in a clean working environment, machining accuracy and holdability.

  Disposal of dust such as sawdust is a problem in the cutting work with a circular saw. Since dust spreads over a wide area by the rotational force of a saw blade that rotates at a high speed, the working environment has been significantly deteriorated. Most circular saws currently in use have a 45 degree tilt mechanism.

  Round saws equipped with dust collectors have poor collection efficiency and are not very popular due to their high price.

  The circular saw that attaches the dust collector has a trapping effect, but it is not used very much because it is cumbersome to set up and is not easy to operate.

  The 45 degree tilt mechanism is convenient but not used very often. On the other hand, accuracy such as vertical is sacrificed, and a model equipped with a precise adjustment mechanism for adjusting it is expensive.

  Most circular saws have a 45-degree tilting mechanism, and the opening 18 of the base is wide, and the probability that the surface portion will be turned up during cutting is high.

  There are few portable circular saws with sub-handles, and depending on the direction and place of cutting, the posture becomes unsafe and very dangerous.

  When cutting a straight line using a plywood or the like having a thickness of less than 20 mm as a ruler, the motor part comes into contact with the plywood or the like serving as a ruler and cannot cut deeply.

  The flow of air generated by the inertial force and centrifugal force due to the high-speed rotation of the saw blade, and the air flow generated by the blower 14 for cooling the motor efficiently flow into the exhaust port 1 at the rear of the saw blade casing 10 and are connected. The pack 33 collects dust such as sawdust.

  The safety cover 21 with the ventilation slit and the radial slit 31 of the saw blade change the centrifugal force that has caused the leakage into a powerful centrifugal force necessary for collecting dust.

  The 45-degree tilt function that is not frequently used is removed to improve vertical accuracy.

  The cut surface pressing portion 18 of the base is extended to the edge of the saw blade to prevent the surface from being turned over when cutting.

  A mast 19 for a sub handle is provided on the base surface, and a movable sub handle 8 whose direction can be changed in three directions is attached to improve holdability.

  Make the motor part float 20mm or more from the base surface.

  The air flow due to the inertial force and centrifugal force due to the high-speed rotation of the saw blade and the air flow of the blower 14 for cooling the motor are concentrated at the exhaust port 1 so that sufficient dust collection is possible without connecting to an external dust collector. An effect can be obtained. Of course, it is also possible to connect a dust collector and use it as a dust collection circular saw.

  Ease of use is improved by removing the infrequently used mechanism and strengthening the parts that are always used.

  It is safe because you do not have to work in an unreasonable posture.

  By making the motor part 20 mm or more above the base surface, deep cutting using a plywood or the like as a ruler becomes possible.

  A circular saw to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a plan view of a circular saw to which the present invention is applied. The movable sub handle 8 can be parallel to the motor to wind the power cord, and the cord reel guide 7 eliminates the need for the cord to be separated. When the movable sub handle 8 is twisted to the left, the connecting portion with the mast is loosened, and the direction of the sub handle can be freely changed. The sub handle connecting portion of the mast 19 has dents at three positions of 90 degrees, 0 degrees, and -90 degrees. When the sub handle is twisted to the right, the tip of the screw enters the dent and can be fixed securely.

  FIG. 2 is a horizontal sectional view of a circular saw to which the present invention is applied. When the blower 14 attached to the shaft of the motor rotates, air is taken in from the cooling inlet 12 and dust such as saw dust is pushed out from the outlet 1 arranged behind the saw blade housing 10.

  FIG. 3 is a plan view of the base of the circular saw. The width of the base is 100 mm and 30 mm based on the surface of the saw blade on the motor side, and the positioning of the ruler when cutting a straight line is simplified. Further, by removing the 45-degree tilt mechanism, the cut surface pressing portion 18 can be extended to the edge of the saw blade, and the cut surface can be prevented from being turned up.

  FIG. 6 is a cross-sectional view seen from the back, in which a scene where a counter with ears is being cut is imaged. An 18 mm plate is used as a ruler.

  FIG. 7 is a cross-sectional view when cutting, and shows a state in which the safety cover 21 is in the saw blade housing 10. Sawdust passes between the saw blade housing 10 and the safety cover 21, and the guide vane 25 extending from the lower portion of the exhaust port 1 discharges the sawdust to the exhaust port 1 side. Radial slits 31 inserted into the disk surface of the saw blade increase the contact area with the air to generate a strong centrifugal force, and the surrounding air with the centrifugal force forms a linear slit 24 of the safety cover 21 together with sawdust. Through the exhaust port 1.

  FIG. 8 is a cross-sectional view of the state where the safety cover 21 is lowered and the saw blade is stopped. The air sent from the blower 14 incorporated in the circular saw body flows into the saw blade housing 10 from the air passage 9 and is exhausted from the exhaust port 1.

Plan view of the circular saw looking down from the top A plan view of a circular saw cut horizontally at the center. Round saw base plan view Round saw right side view Round saw left side view The state of cutting the plate with ears using the plate as a ruler as seen from the rear Cross-sectional view of the circular saw when cutting Cross section of the circular saw with the safety cover down Figure of the dedicated adapter when using the vacuum cleaner garbage pack Check valve shape of the adapter Figure of 45 degree bend for exhaust Figure of saw blade with radial slits Vacuum cleaner trash pack and dedicated adapter connected

Explanation of symbols

1 Exhaust port (dust collector connection)
2 Cutting depth scale and height holding slider 3 Lock lever for height holding slider 4 Parallel ruler set screw 5 Power cord 6 Power cord wound state 7 Power cord reel guide / intake funnel 8 Movable sub handle 9 Cooling Air exhaust port 10 Saw blade housing 11 Power supply base chamber 12 Cooling intake port 13 Bearing 14 Blower 15 Deceleration mechanism, brake 16 Cut-off side position 30 mm
17 Uncut side position 100mm
18 Construction material presser (prevents turning)
19 Movable Sub Handle Mast 20 Parallel Ruler 21 Safety Cover with Ventilation Slit 22 Ruler Substrate Plate 23 Saw Waste Passing Space 24 Exhaust Slit 25 Exhaust Guide Vane 26 Round Saw Connection Port 27 Dust Pack Adapter for Vacuum Cleaner (Rubber)
28 Dust pack mount fixing groove 29 Same as above Check valve 30 45 degree bend for exhaust (made of rubber)
31 Radial slit 32 Garbage pack fixing mount 33 Garbage pack for vacuum cleaner

Claims (7)

  Cooling air is taken in from the air inlet 12 along the funnel-shaped cord reel guide 7 by the blower 14. The air after cooling the motors is sent from the air passage 9 to the saw blade housing 10 to generate a total pressure (dynamic pressure + static pressure) necessary for collecting saw dust.   A radial slit 31 is provided on the saw blade to increase the contact area between the saw blade and air. Increases frictional resistance with the air and imparts centrifugal force to the air to increase the efficiency of sawdust collection.   A horizontal line-shaped ventilation slit 24 is provided in the safety cover 21, and the air generated in the second aspect is exhausted to the exhaust port 1.   The cord reel guide 7 at the air inlet 12 is formed into a funnel shape, the movable sub handle 8 is bent to the left, and the power cord is wound up.   A movable sub handle 8 is provided with a mast 19 on the base. The direction of the movable sub handle 8 can be changed according to the direction of cutting and the difference of the dominant arm.   The building material holding part 18 of the base is extended to the edge of the saw blade to prevent the building material from being turned up. Further, the width of the base is divided into 100 mm and 30 mm, the side 17 leaving the 100 mm side, and the 30 mm side is the cut-off side 16. The building material pressing part on the cut-off side is slightly opened so that the cut part of the saw blade can be seen.   When cutting the building material, it is raised by about 20 mm so that the motor portion does not contact the plate material 22 used as a ruler. (See FIG. 6) The lower portion of the cord reel guide 7 is cut.

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