JP2014000617A - Water injection type power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water injection type power tool preventing water from being sucked from an air window and preventing burning of a motor.SOLUTION: A water injection type power tool includes a fan F which projects a spindle disposed in parallel with an output shaft of a motor M and rotationally transmitted from the output shaft from housings 2 and 3 housing the motor M and is mounted on the output shaft to cool the motor M, and a disk-shaped tool 24 mounted in the spindle to perform polishing of a material to be polished. The water injection type power tool is a water injection sander 1 capable of injecting water to the disk-shaped tool 24 by forming an air window introducing cooling air by the fan F into the housings 2 and 3 on rear surfaces of the housings 2 and 3. A cover member 30 is mounted in each of the housings 2 and 3 to cover the air window from the outside with a gap and cover an outer peripheral surface with a gap by being formed to go around the outside of an outer peripheral surface of each housing 2 and 3 from the outside.

Description

  In this invention, a spindle that is arranged in parallel with the output shaft of the motor and that is rotated and transmitted from the output shaft is protruded from the housing that houses the motor, and is attached to the spindle so that the workpiece can be polished. The present invention relates to a water-filling type electric tool that includes a disk-shaped tool that is capable of pouring water into the disk-shaped tool.

  For example, in Patent Document 1, a spindle that is arranged in parallel with an output shaft of a motor and is rotated and transmitted from the output shaft is protruded from a housing that houses a motor, and polishing work can be performed on an object to be polished on this spindle. A water injection type electric tool is disclosed in which a disk-like tool is attached and a water injection path is formed in the spindle to inject water into the polishing portion of the material to be polished. In this water injection type electric tool, a fan for cooling the motor is attached to the output shaft, accommodated in the housing, and air for cooling by the fan is formed on the rear surface of the housing and communicated with the inside and the outside of the housing. The motor is cooled by being introduced into the housing.

No. 5-11960

  In general, an operator may temporarily place the water-injecting power tool on the upper surface of the material to be polished while supporting it on the rear surface of the housing during the polishing of the material to be polished. At this time, since the water poured from the water-filled power tool during the polishing process remains on the upper surface of the material to be polished, the fan is used to cool the motor together with the cooling air from the wind window provided on the rear surface. There was a disadvantage that water remaining on the upper surface of the abrasive was sucked into the housing.

  Also, during the polishing process, the operator presses the rear surface of the housing with his hand to press the disc-shaped tool against the material to be polished. There is a possibility that it cannot be introduced into the housing from the wind window. As a result, there was a concern that the motor would burn out.

  The present invention has been proposed in view of such a situation, and an object thereof is to provide a water injection type electric tool that prevents water from being sucked from a wind window and prevents burning of a motor.

  The water injection type electric tool according to the invention of claim 1 is attached to the output shaft by projecting a spindle which is arranged in parallel with the output shaft of the motor and is transmitted to rotate from the output shaft, from a housing housing the motor. A fan that cools the motor, and a disk-shaped tool that is attached to the spindle and enables polishing of the material to be polished, and cooling air from the fan is provided in the rear surface of the housing. A water injection type electric tool that forms an air window to be introduced into the disk-shaped tool and can inject water into the disk-shaped tool, and covers the air window from the outside with a gap in the housing. A cover member that is formed so as to wrap around outside and covers the outer peripheral surface with a gap is mounted.

  The invention of claim 2 is characterized in that, in claim 1, the cover member is detachable from the housing.

  According to a third aspect of the present invention, in the second aspect of the present invention, the cover member includes locking means that can be locked to the outer peripheral surface of the housing.

  According to a fourth aspect of the present invention, in the second or third aspect, an elastic body is interposed between the inner surface of the cover member and the rear surface of the housing.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a rib that contacts the outer peripheral surface of the housing is formed on the inner surface of the cover member.

According to the water injection type electric tool according to the first aspect of the invention, the cover member covers the wind window from the outside, thereby preventing water from being sucked into the housing from the wind window. In addition, since a gap can be secured between the inner surface of the cover member and the wind window or between the inner surface and the outer peripheral surface of the housing, the cooling air for the motor is guided from the outside of the cover member to the wind window through this gap. be able to. Therefore, even when the cover member is attached to the housing, the motor cooling air can be introduced into the housing, so that the motor can be prevented from being burned out.
According to the second aspect of the present invention, if the cover member is damaged, the damaged cover member can be easily removed from the housing and replaced with a new cover member.
According to the invention of claim 3, the cover member can be easily mounted on the housing only by being locked to the outer peripheral surface of the housing by the locking means.
According to the fourth aspect of the present invention, the elastic member interposed between the inner surface of the cover member and the rear surface of the housing can prevent the cover member from rattling with respect to the housing.
According to invention of Claim 5, a cover member can be hold | maintained on the outer peripheral surface of a housing via a rib. Furthermore, since a gap is secured between a portion of the inner surface of the cover member other than the rib forming portion and the outer peripheral surface of the housing, a ventilation path from the outside of the cover member to the wind window can be secured by this gap.

1 is an overall perspective view of a water injection sander according to an embodiment of the present invention. It is the rear surface side perspective view of the water injection sander which removed the cover member from the motor housing. It is a disassembled perspective view of the motor housing and the cover member. It is a disassembled perspective view of the motor housing and the cover member when the water injection sander is viewed from the front. It is a front view of the cover member. It is an AA arrow directional view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the water injection sander 1 is made of resin and has a cylindrical motor housing 2 along the front-rear direction (the left-right direction in FIG. 1), and a gear housing 3 made of metal and connected to the front of the motor housing 2. And a resin loop handle 4 formed below the motor housing 2 and the gear housing 3. This water injection sander 1 is an example of the water injection type electric tool of the present invention.
The loop handle 4 includes a handle rear half 6 that protrudes downward from the lower rear part of the motor housing 2, and an L-shaped handle front half 8 that extends from the lower part of the handle rear half 6 to the front part of the gear housing 3. And have.
The loop handle 4 is looped from the lower side of the motor housing 2 and the lower side of the gear housing 3 with the handle rear half 6 as the rear, the front side of the handle front half 8 as the front, and the lower side as the lower side. It protrudes.

  A motor M is accommodated in the motor housing 2 shown in FIG. 1, and the tip of the output shaft of the motor M projects into the gear housing 3. The motor M is driven by the power supply from the power cord 10, and the switch 11 is exposed at the handle rear half 6. A spindle (not shown) is mounted in the gear housing 3 sideways via a bearing (not shown). The spindle is arranged in parallel with the output shaft of the motor M, and the rotation of the output shaft is transmitted to the spindle by meshing the output shaft. The front end of the spindle protrudes from the front end of the gear housing 3 to the front of the gear housing 3. A disc-shaped polishing tool 24 is attached to the front end of the spindle so as to be orthogonal to the spindle. The polishing tool 24 is an example of the disk-shaped tool of the present invention.

  On the other hand, a water injection path is formed in the spindle in the axial direction of the spindle. A water injection pin 25 (see FIG. 1) is fixed to the water injection channel coaxially with the water injection channel. A water injection nozzle hole 26 is opened in the pin 25, and the water injection nozzle hole 26 communicates with the water injection path. In addition, a water distribution pipe for supplying water to the water injection channel is disposed inside the front handle half 8. A valve for adjusting the flow rate is provided on the lower side of the water distribution pipe, and a hose connection portion 27 (see FIG. 1) for passing water is connected to the lower side of the valve. As shown in FIG. 1, the connection portion 27 is exposed from the lower side of the corner portion of the handle front half portion 8.

  A protective cover 28 (see FIG. 1) is molded from an elastic body (synthetic rubber) and attached to the handle front half 8 and the gear housing 3. The protective cover 28 is formed in a dish shape with an opening on the front side, and covers the rear half (the lower side in FIG. 1) of the polishing tool 24 from the rear side in a non-contact manner.

  As shown in FIG. 2, air windows 15, 15... For introducing cooling air for the motor M into the motor housing 2 are formed on the rear surface (right side in FIG. 2) of the motor housing 2. As shown in FIGS. 2 to 4, brush holder portions 17 are provided on both the left and right sides of the motor M 2 at the rear portion in the motor housing 2 (the right side in FIGS. 2 to 4). Each brush holder portion 17 has a cylindrical shape extending in a direction orthogonal to the output shaft of the motor M, and holds a brush that is in sliding contact with the commutator of the motor M. The outer periphery of the tip of each brush holder portion 17 is formed integrally with the left and right side surfaces of the rear portion of the motor housing 3 and is exposed to the outside of the motor housing 2 from the both side surfaces. On the other hand, on the left and right side surfaces of the motor housing 2 at the front portion of the motor housing 2 (left side in FIGS. 1 to 4), the cooling air exhaust ports 16 are formed. Each exhaust port 16 is located outside the fan F that cools the motor M attached to the output shaft of the motor M in the motor housing 2.

  As shown in FIGS. 1, 3, and 4, a resin cover member 30 is detachably attached to the rear portion of the motor housing 2. The cover member 30 has a cylindrical main body 31 having a diameter larger than that of the motor housing 2 and opened on the front side (motor housing 2 side), and arms extending from the left and right side surfaces of the main body 31 to the motor housing 2 side. Parts 32 and 32. As shown in FIGS. 3 to 5, four ribs 35 are formed on the inner surface of the main body 31 at equal intervals in the circumferential direction of the main body 31. Each rib 35 is continuous with the front opening of the main body 31 and extends from the inner peripheral surface of the main body 31 to the inner surface of the rear surface of the main body 31 (the right side in FIGS. 3 and 4), and the inner peripheral surface and the rear surface. To the inside of the main body 31. Each rib 35 can be brought into contact with the outer peripheral surface and the rear surface of the motor housing 2 as described later.

  In addition, as shown in FIGS. 3 to 6, on the inner surface side of the rear surface of the main body portion 31, a cylindrical protrusion extending to the front side of the main body portion 31 between the ribs 35, 35 in the circumferential direction of the main body portion 31. Four 36 are formed. As shown in FIG. 6, each projection 36 is provided with a cylindrical hole 37. As shown in FIGS. 3 to 5, rubber pins 38 are inserted into the respective cylindrical holes 37 so as to protrude from the cylindrical holes 37. Each rubber pin 38 is interposed between the inner surface of the cover member 30 (the inner surface of the rear surface of the main body 31) and the rear surface of the motor housing 2 when the cover member 30 is attached to the motor housing 2 as will be described later.

  Further, as shown in FIGS. 3 to 6, locking claws 39 project from the extended end portions of the respective arm portions 32 toward the inside of the arm portions 32. As shown in FIGS. 1 and 4, the locking claws 39, 39 are used for locking to the outer periphery of the tip of the brush holder portion 17, 17 exposed from the left and right side surfaces of the motor housing 2. Each locking claw 39 is an example of the locking means of the present invention.

  The cover member 30 can be attached to and detached from the rear portion of the motor housing 2 in the following manner. An operator inserts the motor housing 2 into the main body 31 from the front opening by bringing the front opening of the main body 31 of the cover member 30 close to the rear surface of the motor housing 2. Thereafter, each rubber pin 38 (see FIG. 4) is brought into contact with the rear surface of the motor housing 2, and each of the ribs 35 (see FIGS. 4 and 5) is placed in front of the rear surface and the rear surface. It is made to contact | abut to the outer peripheral surface of each. By elastically deforming each arm portion 32 in this state, the locking claws 39, 39 are locked to the outer circumferences of the tips of the brush holder portions 17, 17 as shown in FIG. Thus, the cover member 30 is held on the outer peripheral surface and the rear surface of the motor housing 2 via the ribs 35 with the rubber pins 38 interposed between the inner surface of the rear surface of the main body 31 and the rear surface of the motor housing 2. The Since the cover member 30 is supported on the rear surface of the motor housing 2 by the rubber pins 38, the cover member 30 is prevented from rattling with respect to the motor housing 2. In this way, the cover member 30 is attached to the rear portion of the motor housing 2. Each rubber pin 38 is an example of the elastic body of the present invention.

  Since the main body 31 is cylindrical with a larger diameter than the motor housing 2 and opened at the front side, when the cover member 30 is mounted on the rear part of the motor housing 2, each rib 35 and each rubber pin 38 on the inner surface of the main body 31. In the part other than the part (formation part) formed, the windshields 15, 15,... (See FIG. 2) are covered from the outside in a non-contact manner by the main body part 31 and the outer peripheral surface of the motor housing 2 is contact-free. Can be covered. At this time, the main body 31 wraps around the outside of the outer peripheral surface of the motor housing 2 from the outside of the wind windows 15, 15. In this way, in a portion other than the forming portion, a gap is secured between the inner surface of the main body 31 and the outer peripheral surface of the motor housing 2, and the inner surface of the main body 31 and the rear surface of the motor housing 3 A gap is secured between the two. With these gaps, it is possible to secure a ventilation path from the outside of the main body 31 to the wind windows 15, 15... Through the front opening of the main body 31.

  Further, when removing the cover member 30 from the rear portion of the motor housing 2, the arm portions 32 are elastically deformed to release the engagement of the engagement claws 39, 39 with respect to the outer circumferences of the brush holder portions 17, 17, It is only necessary to separate the cover member 30 from the rear part of the motor housing 2. Therefore, the cover member 30 can be easily attached to and detached from the motor housing 2.

  In such a water injection sander 1, when the power cord 10 is connected to the power source and the switch 11 of the loop handle 4 is turned on, the spindle rotates as the motor M is driven, so that the polishing tool 24 attached to the spindle rotates. Rotate. In addition, when the fan F rotates as the motor M is driven, the cooling air of the motor M is supplied from the outside of the main body 31 of the cover member 30 to the inner surface of the main body 31 and the outer peripheral surface and rear surface of the motor housing 2. Are circulated through a gap (ventilation path) between them and guided to the wind windows 15, 15. The cooling air sucked into the motor housing 2 from the air windows 15, 15... Is discharged from the exhaust ports 16, 16. The worker holds the spindle in a state orthogonal to the horizontal surface of the material to be polished, and moves the polishing tool 24 while pressing the rear surface of the main body portion 31 with the hand while touching the horizontal surface, thereby polishing the horizontal surface. Apply. During the polishing process, water supplied from a hose connected to the connection part 27 (see FIG. 1) is poured into the polishing tool 24 and the polishing process part. In this embodiment, even if the main body 31 is pressed by the operator's hand during the polishing process, there is a gap between the inner surface of the main body 31 and the wind windows 15, 15.・ Will not be blocked.

  Further, during polishing, an operator may temporarily place the water injection sander 1 on the horizontal plane by supporting the rear surface side of the motor housing 2 on the horizontal plane of the material to be polished where water remains. Even in this case, the water injection sander 1 is supported on the horizontal plane by a cover member 30 that covers the wind windows 15, 15... From the outside with a gap, so that water remaining on the horizontal plane is blown by the fan F suction air. It is blocked from heading to 15,15. Therefore, water can be prevented from being sucked into the motor housing 2 from the wind windows 15, 15. In addition, in this embodiment, when the water injection sander 1 is temporarily placed on the horizontal surface of the material to be polished, the inlet of the ventilation path (the front opening of the main body 31) can be separated upward from the horizontal surface. Also from such a thing, it can suppress that the water on the said horizontal surface enters into a ventilation path.

  In addition, since the cover member 30 can be attached to and detached from the motor housing 2, if the cover member 30 is damaged due to damage or the like, the damaged cover member 30 is removed from the motor housing 2 and a new cover member is removed. 30 can be easily replaced.

<Effect of this embodiment>
In this embodiment, for example, even when the water injection sander 1 is temporarily placed on the horizontal surface of the material to be polished during the polishing process, the cover member 30 (main body portion 31) covers the wind windows 15, 15,. The water poured on the horizontal plane by the sander 1 can be prevented from being sucked into the motor housing 2 from the wind windows 15, 15. In addition, a gap can be secured between the inner surface of the cover member 30 and the wind windows 15, 15... And between the inner surface and the outer peripheral surface of the motor housing 2. For this reason, the cooling air for the motor M can be guided from the outside of the cover member 30 to the wind windows 15, 15. Therefore, even when the cover member 30 is attached to the motor housing 2, the cooling air can be introduced into the motor housing 2, so that the motor M can be prevented from being burned out.

  If the cover member 30 is damaged, the damaged cover member 30 can be easily removed from the motor housing 2 and replaced with a new cover member 30.

  Furthermore, the cover member 30 can be simply attached to the motor housing 2 simply by locking the locking claws 39 of the cover member 30 to the outer periphery of the tip of the brush holder portion 17 exposed from the left and right side surfaces of the motor housing 2. Can be attached to.

  In addition, the cover member 30 is supported on the rear surface of the motor housing 2 by rubber pins 38 interposed between the inner surface of the rear surface of the main body 31 and the rear surface of the motor housing 2. Thereby, it is possible to prevent the cover member 30 from rattling with respect to the motor housing 2.

  In addition, the cover member 30 can be held on the outer peripheral surface of the motor housing 2 via the four ribs 35. In addition, a gap can be secured between a portion of the inner surface of the cover member 30 (main body portion 31) other than the portion where the ribs 35 are formed and the outer peripheral surface of the motor housing 2. For this reason, the ventilation path from the exterior of the main-body part 31 to the wind window 15, 15, ... can be ensured by the said clearance gap.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. For example, in the embodiment described above, the cover member 30 can be attached to and detached from the motor housing 2, but unlike this, the cover member may be formed integrally with the motor housing. Further, in the above-described embodiment, in order to attach the cover member 30 to the motor housing 2, the locking claws 39, 39 of the cover member 30 are locked to the outer periphery of the tip of the brush holder portion 17, 17 in the motor housing 2. However, it is not limited to this. For example, the cover member may be mounted on the motor housing by a locking claw provided on both the left and right side surfaces of the motor housing and a locking groove provided on the cover member and into which the locking claw fits. Furthermore, unlike the embodiment described above, the motor housing 2 and the gear housing 3 may be formed of a single housing.

  Moreover, although the example which applies this invention to AC drive type water injection sander was shown in embodiment mentioned above, not only this but this invention is AC drive type or charge type provided with the rechargeable water injection sander or the water injection mechanism. You may apply to water-injection type electric tools, such as a type polisher.

  1 .... Water injection sander, 2 .... Motor housing, 3 .... Gear housing, 15 .... Wind window, 24 .... Polishing tool, 30..Cover member, 35..Rib, 38..Rubber pin, 39..Locking Claw, F ... Fan, M ... Motor.

Claims (5)

A fan that is arranged in parallel to the output shaft of the motor and that is rotated and transmitted from the output shaft is projected from a housing that houses the motor, and a fan that is attached to the output shaft and cools the motor; A disk-shaped tool that is attached and enables a polishing process to be performed on the material to be polished, and a wind window for introducing cooling air from the fan into the housing is formed on the rear surface of the housing. A water injection type electric tool that can inject water into
The housing is provided with a cover member that covers the air window from the outside with a gap and is formed so as to wrap around from the outside to the outside of the outer peripheral surface of the housing and covers the outer peripheral surface with a gap. Water injection type electric tool.   The water injection type electric tool according to claim 1, wherein the cover member is detachable from the housing.   The water injection type electric tool according to claim 2, wherein the cover member includes locking means that can be locked to the outer peripheral surface of the housing.   The water injection type electric tool according to claim 2 or 3, wherein an elastic body is interposed between an inner surface of the cover member and the rear surface of the housing.   The water injection type electric tool according to any one of claims 1 to 4, wherein a rib to be brought into contact with the outer peripheral surface of the housing is formed on an inner surface of the cover member.

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