JP5039574B2 - Electric tool with battery - Google Patents

Description

  The present invention relates to a battery-equipped electric tool including a battery that supplies power to a motor.

  Conventionally, as this type of electric tool with a battery, an electric polisher having a battery built in a position below a rear portion of a case of a main body is known, as described in Patent Document 1 below. The electric polisher incorporates a motor in the front part of the main body, an output shaft is provided below the motor shaft, and a brush is attached to the output shaft. Then, the gripping portion provided at the upper rear position of the main body portion is gripped and used by pressing the brush against a car or the like.

Japanese Utility Model Publication No. 55-16836 JP 47-40398 A Japanese Utility Model Publication No. 56-132055

  However, in the conventional electric tool with a battery, since the grip portion is provided rearwardly with respect to the output shaft, even if the grip portion is gripped and the brush is pressed against the car, It is difficult to press the brush uniformly back and forth because it is difficult to stabilize back and forth. In addition, the heavy battery is located rearward from the output shaft, and the entire power tool tends to tilt backward during the operation, making stable operation difficult.

  In addition, there is an electric power tool described in Patent Documents 2 and 3 as a type that does not include a battery. Since the output shaft is located rearward with respect to the motor shaft, the entire electric tool tends to tilt forward due to the weight of the motor located at the front, and the tool is brought into contact with the polishing surface evenly in the front-rear direction. Is difficult.

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an electric tool with a battery excellent in workability capable of stably and uniformly pressing a tool against a work target.

The present invention has been made to solve the above-described problems, and an electric tool with a battery according to the present invention includes a motor storage unit that stores a motor , a battery mounting unit that mounts a battery that supplies power to the motor , and a gripping unit. A main body portion having the motor housing portion is disposed on the front side of the gripping portion, the battery mounting portion is disposed on the rear side of the gripping portion, and the motor housing portion, the battery mounting portion, and the gripping portion are The base is configured to have a base part that is a connecting part that connects the lower part of the motor housing part and the lower part of the battery mounting part in the front-rear direction, and is driven by the motor below the base part. that the tool is arranged, and an output shaft for driving the tool by the output of the motor, a reduction mechanism is provided for reducing the output of said motor, said output shaft, said motor Osamu Arranged Moreover below the grip portion located between the parts and the battery mounting section, said speed reduction mechanism portion is disposed inside the base portion, the center of gravity of the power tool is kicked with the position under the grip portion Features.

  In the electric tool with a battery having such a configuration, since the motor is located on the front side and the battery is located on the rear side with respect to the output shaft, the weight balance between the front and rear is excellent, and the entire electric tool is stabilized. In particular, by arranging the battery behind the gripping part, it is possible to increase the size of the battery without increasing the size of the gripping part, and the gripping part can be formed to be easily gripped. It will be possible to work on time. Since the grip portion is positioned between the front and back of the motor and the battery, the grip portion can be gripped and work can be performed stably. In addition, since the output shaft is located below the grip portion, the tool in a stable state can be pressed uniformly against the work object and can be easily operated.

  In particular, the gripping part is formed in a cylindrical shape that is narrower than the motor storage part, in which the power line from the battery to the motor is stored, and behind the gripping part is a battery mounting part that is wider than the gripping part. It is preferable that a battery is detachably mounted on the battery mounting portion. By making the gripping part narrower than the motor storage part, it is easy to grip the gripping part, but you can use a relatively large motor, and by making the gripping part cylindrical, you can grip only the left and right side surfaces The tool can be stabilized by gripping firmly as compared with the type of gripping part. By storing the power line inside the cylindrical gripping part, the inside of the gripping part can also be used effectively, and the motor and the battery can be electrically connected by the shortest path. In addition, by adopting a configuration in which a battery mounting part wider than the gripping part is provided behind the gripping part so that the battery can be attached and detached, a large battery can be mounted while maintaining ease of gripping, and battery replacement is also possible. Since it becomes easy, the workable time can be greatly extended by a plurality of batteries.

  In addition, it is preferable that an operation portion of a switch for controlling power supply to the motor is provided in the grip portion, and the operation portion is located above the output shaft. When the switch operating part is provided in the gripping part, the operation of the operating part itself can be easily performed while gripping the gripping part, and even if the switch is operated during the operation, the electric tool is less likely to shake. Therefore, it is also possible to prevent problems from occurring due to the switch operation. In addition, since the operation unit is located above the output shaft, the output shaft is less likely to be shaken along with the switch operation, and the failure occurrence rate of work associated with the switch operation is suppressed.

Further, it is preferable that the upper portion of the top and the battery mounting section of the motor housing portion is coupled to the front and rear by the gripping portion. Since the motor storage portion, the grip portion, and the battery mounting portion are configured in a gate shape, the heavy motor and battery can be firmly pressed downward from above when the grip portion is gripped. And since the lower part of the battery mounting part is connected to the lower part of the motor storage part by the connection part, the downward force acting on the motor storage part and the battery mounting part from the grip part is transmitted to the connection part and finally output Will be transmitted to the shaft. Therefore, the force for gripping the gripping portion is accurately transmitted to the output shaft located below the gripping portion, and the work can be performed easily and stably.

  As described above, the gripping portion is provided between the front and back of the motor and the battery, and the output shaft is positioned below the gripping portion. Can be uniformly transmitted from the output shaft to the tool, and the tool can be easily and evenly pressed against the work object. Further, by providing the battery behind the gripping portion, the battery can be enlarged without increasing the size of the gripping portion, and a long-time operation is possible.

Hereinafter, an embodiment of an electric tool with a battery according to the present invention will be described with reference to the drawings.
1 to 4 show a sander with a battery as an embodiment of an electric tool with a battery. The sander includes a main body portion 1 having a motor storage portion 11 for storing the motor 3, and a tool 2 provided below the main body portion 1 and driven by the motor 3.

  As shown in FIG. 1, the main body 1 includes a base 10 that is located above the tool 2, a motor storage 11 that protrudes upward from the front of the base 10, and an upper portion of the motor storage 11. It has a grip portion 12 extending rearward in a horizontal state and a battery mounting portion 13 provided at the rear of the grip portion 12. The upper portion of the base portion 10 has a lower portion of the motor storage portion 11 and a battery mounting portion 13. It becomes the connection part which connects the lower part of this to back and forth. And the dust collector 5 is attached to the rear-end part of the base part 10 so that it may extend back, and the battery 4 is detachably attached to the battery attachment part 13 with the front-rear direction as the attachment / detachment direction from the rear side. The main body 1 is formed in a hollow shape by a housing that constitutes the outer surface thereof, and the housing has a left-right halved structure with a central portion in the left-right direction as a dividing line, and is made of, for example, a resin molded product.

  As shown in FIG. 2, the motor 3 housed in the motor housing 11 is arranged such that the motor shaft 31 (rotary shaft) faces in the vertical direction, the tip of the motor shaft 31 faces down, and the motor terminal 32 faces up. Has been. Further, since the motor 3 has a cylindrical shape as a whole, the motor housing portion 11 has a substantially circular shape in cross-sectional view corresponding to the shape of the motor 3 as shown in FIG. Although not shown in detail, the motor 3 includes a fan that rotates together with the rotor inside a cylindrical case, and the case has a total of four windows 33 spaced circumferentially at positions outside the fan. Is formed. Then, as the fan rotates, air inside the case is discharged from the window 33, and at the same time, air flows into the case from both end openings, that is, the upper end opening and the lower end opening, and the inside of the case is cooled by this air flow. It has a structure. Accordingly, the housing in the motor housing 11 has an upper intake hole 41 for taking air from the outside into the upper end opening of the motor 3 case, and a lower intake hole for taking air from the outside into the lower end opening of the motor 3 case. 42 and an exhaust hole 43 for discharging the air discharged from the case window 33 to the outside.

  Further, as shown in FIG. 3, the grip portion 12 is formed narrower than the motor storage portion 11 and is continuous from the motor storage portion 11 with a smooth curved surface. Moreover, the holding part 12 is cylindrical and extends in the front-rear direction. As shown in FIG. 2, a power line 20 that electrically connects the battery 4 and the motor terminal 32 of the motor 3 is provided inside the grip portion 12. In addition, a switch 21 for ON / OFF control of power supply to the motor 3 is provided in the middle of the electrical path from the battery 4 to the motor terminal 32 of the motor 3. Located in the gripping part 12, the operation part 23 of the switch 21 is provided in front of the lower surface of the gripping part 12. The operation part 23 of the switch 21 is configured to tilt up and down with the front end as a fulcrum. When the operation part 23 of the switch 21 is pushed upward against the force of the spring 24 biased downward, the switch 21 is When the motor 3 is activated and the force to push the operation portion 23 of the switch 21 is released, the operation portion 23 of the switch 21 returns to the original lower position by the urging force of the spring 24 and the switch 21 is turned off and the motor is turned off. 3 stops. As shown in FIGS. 1, 3, and 4, an anti-slip layer 25 is coated on the surface of the housing at the upper portion of the grip portion 12 and the rear portion of the motor storage portion 11. The anti-slip layer 25 covers the upper half region of the grip portion 12 over substantially the entire length, and gradually increases the covering area downward toward the front side, while the motor storage portion 11 covers the upper portion on the rear side. The rear left and right sides are also covered so as to cover and hang downward from there. This is because the operating unit 23 of the switch 21 is pushed with the index finger and the gripping unit 12 is gripped with all five fingers from above, and the operating unit 23 of the switch 21 is pressed with the ring finger and the thumb. It is also assumed to be used in such a manner that the rear side of the motor storage unit 11 is held between the left and right with the index finger.

  Further, as shown in FIG. 3, the battery mounting portion 13 is wider than the grip portion 12, and a large battery 4 having substantially the same width can be mounted on the rear surface 13a. The battery 4 is wider than the motor housing 11. The battery mounting portion 13 is positioned at the center in the left-right direction (width direction) of the electric tool together with the motor storage portion 11 and the grip portion 12, and has a center layout structure including the battery 4 mounted on the rear surface thereof. Yes. As shown in FIG. 4, the battery 4 includes a substantially rectangular parallelepiped main portion 4 a that is wide and vertically long, and a protruding portion 4 b that protrudes forward from the center in the left-right direction at the upper front of the main portion 4 a. 2, the front surface of the main portion 4a is mounted on the rear surface 13a of the battery mounting portion 13 and the protruding portion 4b is inserted into the rear region of the gripping portion 12, and the front end portion of the protruding portion 4b is mounted. Battery terminal 4 c is electrically connected to power line 20. As shown in FIG. 4, the rear surface 13 a of the battery mounting portion 13 constitutes a part of the rear end portion of the main body portion 1, and the rear end portion of the main body portion 1 is rearward from the rear end portion of the tool 2. It is located slightly forward of the rear end of the tool 2 so as not to protrude. Accordingly, as shown in FIGS. 1 and 2, when the battery 4 is mounted, only the main part 4 a of the battery 4 protrudes rearward from the main body 1, and most of the main part 4 a is rearward of the tool 2. Will be located. The main portion 4a of the battery 4 protruding rearward from the main body 1 has a front-rear dimension smaller than a left-right dimension and a vertical dimension.

  On the other hand, as shown in FIG. 2, the base portion 10 has a speed reduction mechanism portion 51 that reduces the output of the motor 3, and an output shaft that is connected to the motor shaft 31 via the speed reduction mechanism portion 51 and drives the tool 2. 52 is built-in. The output shaft 52 is positioned behind the motor shaft 31 by a gear train constituting the speed reduction mechanism 51, and is parallel to the motor shaft 31 and extends in the vertical direction. That is, the output shaft 52 is positioned between the motor 3 and the battery 4 in the front-rear direction, and therefore is positioned below the grip portion 12. Specifically, the output shaft 52 is directly below the operation portion 23 of the switch 21 in the grip portion 12. Is located. And the output shaft 52 is located in the approximate center part of each of the front-back direction of the tool 2, and the left-right direction. The output shaft 52 is supported by the main body 1, specifically the housing, via bearings 53 and 54 at two locations, an upper end portion and a substantially central portion, and an eccentric shaft 56 is attached to the lower end portion of the output shaft 52. The eccentric shaft 56 is supported by the tool 2 via a bearing 55. Therefore, when the motor 3 rotates the output shaft 52 via the motor shaft 31 and the speed reduction mechanism portion 51, the tool 2 swings periodically back and forth and right and left. Around the output shaft 52, flexible columns 57 made of rubber or the like for connecting the base portion 10 and the tool 2 up and down are provided at a plurality of locations (for example, four locations). The base portion 10 is provided with a skirt portion 10a having a lower opening that is provided along the peripheral edge portion of the rectangular tool 2 in plan view. A dust collecting fan 58 is attached to the output shaft 52. The dust is sucked into the skirt portion 10a through a dust collecting hole (not shown) penetrating up and down and is collected in the dust collector 5 at the rear. The dust collecting fan 58 and the eccentric shaft 56 are integrally formed.

  The tool 2 includes a base plate 60 having a boss portion 60 a having a bearing 55 for supporting the eccentric shaft 56 on the upper surface, and a polishing pad 61 attached to the lower surface of the base plate 60. Abrasive material such as sandpaper is replaceably attached by various holding mechanisms, and its lower surface is used as a polished surface.

  The sander configured as described above grips the grip portion 12 while pressing the operation portion 23 of the switch 21 with the battery 4 mounted, but the motor 3 is positioned on the front side and the battery 4 is positioned on the rear side. Since the grip portion 12 and the output shaft 52 are positioned between the two, the weight balance between the front and rear is excellent, and when the grip portion 12 is gripped, the sander is stabilized back and forth. Since the center of gravity of the sander is located below the gripping portion 12 and the output shaft 52 is located below the gripping portion 12, the force pushing the gripping portion 12 downward is easily transmitted to the entire tool 2, and the work target An object can be uniformly polished. Moreover, since the grip portion 12 is narrower than the motor storage portion 11, it is easy to grip the grip portion 12. Particularly, since the grip portion 12 is cylindrical, the entire circumference of the grip portion 12 is firmly gripped from above. Can do.

  Further, since the upper part of the motor storage part 11 and the upper part of the battery mounting part 13 are connected back and forth by the grip part 12, the motor storage part 11, the grip part 12 and the battery mounting part 13 are configured in a portal shape. When holding 12, the heavy motor 3 and the battery 4 can be firmly pressed from above. That is, the motor 3 does not protrude upward from the gripping part 12, or the battery 4 does not protrude upward from the gripping part 12. Since it is located below, it is possible to work by pressing the motor 3 and the battery 4 from above.

  Furthermore, since the battery mounting portion 13 is not a free end, the lower portion of the battery mounting portion 13 and the lower portion of the motor storage portion 11 are connected back and forth by the base portion 10, so that the rigidity of the main body portion 1 is increased. In addition to being extremely high, the downward pressing force applied to the grip portion 12 is reliably transmitted to the output shaft 52, and the polishing operation can be performed easily and stably.

  In addition, since the operation unit 23 of the switch 21 is provided in the grip unit 12, the operation of the operation unit 23 can be easily performed while gripping the grip unit 12. In particular, since the output shaft 52 is positioned below the operation unit 23 of the switch 21, the sander is stabilized and uniform when performing the polishing operation by grasping the grip unit 12 so as to push the operation unit 23 of the switch 21. Can be polished. Further, even if the switch operation is performed during the work, the shake of the sander and the shake of the output shaft 52 are reduced, and the problem of the polishing work due to the shake is less likely to occur.

  On the other hand, the battery 4 is not built in the main body unit 1 but is disposed in a state of being exposed behind the gripping part 12, so that the battery 4 can be enlarged without increasing the size of the gripping part 12, It is possible to achieve both easy gripping and long-time work with the large battery 4.

  Furthermore, since the grip portion 12 is cylindrical and the power line 20 that connects the motor terminal 32 and the battery terminal 4c is wired therein, the inside of the grip portion 12 can be used effectively, The motor 3 and the battery 4 can be connected at a short distance. In particular, since the grip portion 12 is configured to connect the upper portion of the motor storage portion 11 and the upper portion of the battery mounting portion 13, the motor terminal 32 positioned at the upper portion of the motor storage portion 11 and the upper portion of the battery mounting portion 13. The battery terminal 4c can be connected substantially horizontally, and the wiring can be shortened. Since the protruding portion 4b of the battery 4 is inserted into the grip portion 12 from behind, the wiring between the battery 4 and the motor 3 is further shortened.

  In the present embodiment, a part of the battery 4 is inserted into the grip part 12, but may be configured to be attached and detached without being inserted into the grip part 12, and the design of the shape of the battery 4 can be changed as appropriate. It is.

  Further, as described above, a structure in which the battery mounting portion 13 is connected to the base portion 10 is preferable. However, the battery mounting portion 13 may be separated from the base portion 10 to have a free end configuration.

  In addition, although demonstrated using the sander as an example, it is applicable to various electric tools, such as the tool 2 being a rotating brush.

The front view which shows the electric tool with a battery which concerns on one Embodiment of this invention. The longitudinal cross-sectional view in the dividing line of the housing of the electric tool. The top view of the electric tool. The front view of the state which removed the battery of the electric tool.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main-body part, 2 ... Tool, 3 ... Motor, 4 ... Battery, 4a ... Main part, 4b ... Projection part, 4c ... Battery terminal, 5 ... Dust collector, 10 ... Base part (connection part), 10a ... Skirt 11, motor housing section, 12, gripping section, 13, battery mounting section, 13 a, rear surface, 20, power line, 21, switch, 22, switch body, 23, operation section, 24, spring, 25, anti-slip layer 31 ... Motor shaft, 32 ... Motor terminal, 33 ... Window, 41 ... Upper intake hole, 42 ... Lower intake hole, 43 ... Exhaust hole, 51 ... Deceleration mechanism, 52 ... Output shaft, 53,54 ... Main body side , 55 ... Tool side bearing, 56 ... Eccentric shaft, 57 ... Post, 58 ... Dust collecting fan, 60 ... Base plate, 60a ... Boss part, 61 ... Polishing pad

Claims (4)

A motor storage unit for storing the motor , a battery mounting unit for mounting a battery for supplying power to the motor , and a main body unit having a gripping unit are provided.
The motor storage portion is disposed on the front side of the gripping portion, the battery mounting portion is disposed on the rear side of the gripping portion, and the motor storage portion, the battery mounting portion, and the gripping portion are configured in a gate shape,
The upper part includes a base part that serves as a connecting part that connects the lower part of the motor storage part and the lower part of the battery mounting part in the front-rear direction,
A tool driven by the motor is disposed below the base portion ,
An output shaft that drives the tool by the output of the motor, and a speed reduction mechanism that decelerates the output of the motor;
The output shaft is disposed between the motor storage unit and the battery mounting unit and below the grip unit, and the speed reduction mechanism unit is disposed inside the base unit,
Battery with electric tool, wherein a center of gravity of the power tool is kicked with located below the grip portion.   The gripping part is formed in a cylindrical shape that is narrower than the motor storage part, and the power line from the battery to the motor is stored inside the gripping part, and a battery mounting part wider than the gripping part is provided behind the gripping part. The battery-equipped electric tool according to claim 1, wherein a battery is detachably attached to the battery attachment portion.   The electric tool with a battery according to claim 2, wherein an operation portion of a switch for controlling power supply to the motor is provided in the grip portion, and the operation portion is located above the output shaft. The electric tool with a battery according to claim 2 or 3, wherein an upper part of the motor housing part and an upper part of the battery mounting part are connected to each other by a grip part.

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