JP4004482B2 - Portable power tool and waterproof cover - Google Patents

Description

  The present invention relates to a portable electric tool and a waterproof cover.

  2. Description of the Related Art Conventionally, portable electric tools that can be hand-held are known so that various kinds of work such as polishing and grinding of a workpiece and cutting of a workpiece can be easily performed. (For example, refer to Patent Document 1).

In particular, a portable electric tool of a type in which a tool is driven by a battery is known that can be used even when power cannot be supplied from a generator or a commercial power source.
JP 2002-66897 A (FIG. 1 and the like)

  However, the portable electric tool as described above is not usually used in a special environment such as underwater. For example, when a barnacle attached to a hull is scraped off, a special waterproof tool is used. Worked or worked on the ground with the hull raised from the surface.

  Special waterproof tools are expensive, and even when the hull is lifted from the surface of the water and working on the ground, there is a problem that working efficiency is poor by raising the hull, and neither of them can reduce the cost.

  The present invention has been made in view of the above circumstances, and a portable electric tool that can be held and held by an operator can be used for underwater work, and has a special waterproof structure. As for portable power tools that do not have the above, it is an object to solve the problem of providing a portable power tool that can be used for underwater work easily and inexpensively.

A portable electric tool according to the present invention includes a hand-held housing, a battery disposed in the housing, a tool portion exposed to the outside from the housing, a driving portion for driving the tool portion by the battery, and A portable electric tool body having a switch for manual operation for switching the driving state of the tool part; and exposing the tool part to the outside through an opening; and the entire casing of the portable electric tool body A waterproof cover made of a soft resin that can be used in water, and gas discharge means for discharging gas from the inside to the outside of the waterproof cover through the opening of the waterproof cover. in the shaft portion provided on the tool unit, the has a detachable manually operated to housing tool collet for mounting with the distal end side of even the waterproof cover covering up part of the collet The opening portion of the waterproof cover is opened to a size that can be inserted to attach the shaft portion of the tool portion to the collet, and the waterproof cover can be attached to and detached from the collet. The switch can be operated by manual operation from the outside of the waterproof cover at a location corresponding to the position of the switch of the portable power tool body in the waterproof cover. It is characterized by being configured in a highly flexible region.

According to the portable electric tool of the present invention, the entire casing of the portable electric tool body is covered with the waterproof cover, and the tool is exposed to the outside so that the work can be performed. Since gas is discharged to the outside from the opening that exposes the tool in the cover, when subjected to work in water in that state, the gas is discharged continuously from the opening. Water can be prevented from entering the waterproof cover. Therefore, even if it is an inexpensive portable electric tool body that does not have a special waterproof structure, it is covered with a waterproof cover, and gas is discharged from the opening by the gas discharge means, so that the portable electric tool body is It can be used with sufficient waterproofing. Therefore, even if the work location is underwater, various operations can be performed using a general portable electric tool body that is not waterproof.
Moreover, the switch operation of the portable electric tool body can be performed manually through the highly flexible area of the waterproof cover with the waterproof cover covered, and the waterproof cover is highly flexible, that is, easily deformed. Therefore, it is possible to easily switch the portable power tool body even through the waterproof cover.

  The clearance between the opening of the waterproof cover and the tool portion is preferably as small as possible.

  The portable electric tool which concerns on this invention WHEREIN: You may make the said gas discharge means the structure which can introduce pressurized gas into the inside of the said waterproof cover from the outside in the location away from the said opening part of the said waterproof cover. In this case, for example, by configuring the pressurized gas to be supplied into the waterproof cover from the gas discharge means provided outside the waterproof cover, such as an air pump, the hand-held part of the portable power tool can be made compact, Since the gas discharge amount can be increased, the waterproof property can be enhanced.

  The waterproof cover used in the portable electric tool according to the present invention can be integrally connected through a waterproof structure connecting portion divided into a plurality of parts. With the structure of this waterproof cover, when covering the casing of the portable power tool main body, each of the divided parts is put on the casing individually in advance, and each is integrally connected with the connecting portion. The operation of covering the housing is simplified. Further, when the connecting portion is formed into a screw structure and the divided portions are screwed together, the connecting operation is further simplified, and a waterproof portion at the connecting portion is also obtained.

  According to the present invention, even an inexpensive portable electric tool body that does not have a special waterproof structure is covered with a waterproof cover, and gas is discharged from the opening by the gas discharging means, thereby The tool body can be used with sufficient waterproofing. Therefore, even if the work location is underwater, various operations can be performed using a general portable power tool body that is not waterproof, so various operations underwater can be easily performed, and work efficiency can be improved. And can be waterproofed at a low cost.

  Hereinafter, embodiments of the portable power tool according to the present invention will be described in detail with reference to FIGS. 1 to 6. 1 is an overall plan view showing an example of a portable power tool, FIG. 2 is a plan view of the portable power tool body of FIG. 1, and FIG. 3 is a side view of the portable power tool body of FIG. 4 is a sectional view of the portable power tool body of FIG. 1, FIG. 5 is a partially broken plan view of the waterproof cover of FIG. 1, and FIG. 6 is a plan view of the waterproof cover of FIG. It is a rear view.

  1 to 6, a portable electric tool 1 includes a portable electric tool main body 2 and a waterproof cover 3 made of a soft resin (for example, polyethylene or polypropylene) that covers the portable electric tool main body 2. And an air pump 5 as a gas discharge means for sending air into the waterproof cover 3 and discharging the air from the opening 4 of the waterproof cover 3.

  The portable power tool main body 2 includes a hard resin housing (housing) 6 having a space inside, a battery 7 housed in a rear portion of the space in the housing 6, and a front side of the battery 7. An electric motor 8 as a drive unit arranged, a collet 10 connected to the output shaft 9 of the electric motor 8 and exposed outward from the front end of the housing 6, and a detachable attachment to the collet 10 And a tool 11 (tool part) to be used.

  The battery 7 is a rechargeable secondary battery, and a socket (not shown) into which a charging plug jack for supplying charging power from a charger is inserted is provided in the housing 6, and charging is performed via the socket. Made. The battery 7 has a rectangular parallelepiped shape, and the rear shape of the housing 6 is formed in a rectangular parallelepiped shape in accordance with the outer shape of the battery 7. The front of the housing 6 of the housing 6 extends so as to form a cylindrical outer shape, and the electric motor 8 is disposed in an internal space in the cylindrical portion. Further, the front part of the housing 6 is extended in a conical shape with a conical shape from the place where the electric motor 8 is disposed, and a hole through which the output shaft 9 is passed is provided at the tip. A collet 10 is fixed at the tip of the output shaft 9.

  The battery 7 housing part in the housing 6 mainly corresponds to a part held by an operator, and a switch 12 capable of switching between three positions by a lateral slide is provided on the upper surface side of the part housing the electric motor 8. Yes. The switch 12 is in an off state in which the connection between the battery 7 and the electric motor 8 is cut off at the center position, and the rotation speed of the electric motor 8 is set to a medium speed at the right side position, and the electric motor at the left side position. Switching is performed for a motor drive circuit (not shown) provided therein so that the rotational speed of the motor 8 is higher than the medium speed. Therefore, the operator switches the position of the switch 12 by operating the thumb while holding the portable electric tool main body 2 with one hand, and rotates the tool 11 at a desired rotation speed selected between medium speed and high speed. It is used by driving.

  The tool 11 is, for example, a diamond file, a grinding tool, a brush, or the like, and includes a shaft portion 11 a for attachment to the collet 10. The shaft portion 11a is inserted into the collet 10, and the collet 10 is rotated to the fixed side to integrate the tool 11 and the output shaft 9.

  The portable electric tool body 2 is used without covering the waterproof cover 2 in a normal usage pattern on land that is not underwater.

  When the portable electric tool body 2 is used in water, the waterproof cover 3 is provided so as to cover the entire housing 6 as the portable electric tool 1 according to the present invention, and the waterproof cover 3 is pressurized. An air supply pipe 13 from the air pump 5 for supplying air is connected to the rear end of the waterproof cover 3 and used.

  The waterproof cover 3 is made of a soft synthetic resin and includes cover portions 3a, 3b, and 3c that are divided into front and rear parts as shown in FIGS. The front cover portion 3a has a cylindrical shape with an opening 4 for passing the tool 11 at the front end, and the central cover portion 3b has a stepped shape on the front side and the rear side in accordance with the shape of the housing 6. The cover portion 3c on the rear end side is formed in a cylindrical shape having a bottom portion. In order to connect each cover part 3a, 3b, 3c mutually, the thread part for connecting each other is provided in the edge part corresponding to each connection part. That is, a male screw portion is formed at the rear end portion of the cover portion 3a, and is configured to be screwed to the female screw portion at the front end portion of the cover portion 3b. A male screw portion is formed at the rear end portion of the cover portion 3b, and is structured to be screwed to the female screw portion at the front end portion of the cover portion 3c. In order to integrate the waterproof cover 3, the cover portion 3c is first put on the rear end portion of the housing 6, and the cover portion 3b is put on the center portion of the housing 6 from the front side of the housing 6, The cover portions 3b and 3c are screwed and fixed to each other by relative rotation, and then the cover portion 3a is put on the front side portion of the housing 6, and the cover portions 3a and 3b are screwed and fixed to each other by relative rotation. It will be. Since each of them is fixed by screwing, it is waterproof at the place where the connection is made. The waterproof cover 3 is preferably transparent or translucent.

  An air supply pipe 13 of the air pump 5 is connected to the through hole 13 opened in the bottom part of the cover part 3c, and air is supplied from the air supply pipe 14 into the prevention cover 3. The air supply pipe 14 is provided in a watertight state in the through hole 13 via a seal structure. In the case of this embodiment, the air supply pipe 13 is not integrally fixed to the cover portion 3c but can be attached and detached. However, as an invention of the present application, in the case of supplying gas from the outside into the waterproof cover, the air supply pipe and the waterproof cover may be integrally configured.

  The cover portion 3a covers the portion of the collet 10, and the tool 11 is connected to the collet 10 through the opening 4 that is opened to a size that allows insertion of the shaft portion 11a of the tool 11 attached to the collet 10. Plugged into. The gap between the opening 4 and the shaft 11a of the tool 11 is narrow, for example, about 0.5 mm. The rotation operation of the collet 10 for fixing the tool 11 inserted into the collet 10 is performed manually through the waterproof cover 3. Since the waterproof cover 3 is made of a soft resin, it is relatively easily deformed. When a user holds the waterproof cover 3 by hand to rotate the collet 10, the collet 10 touches the collet 10 through the waterproof cover 3, The state of the rotation operation can be known by a tactile sense through the waterproof cover 3. In addition, the portion 15 corresponding to the switch 12 in the central cover portion 3b is set in a region formed thinner than the other portions, and the thin operation allows the user to manually operate the switch 12. The tactile sensation is easily transmitted to the operator. Therefore, the location 15 corresponding to the switch 12 is highly flexible, so that even if the operator operates the switch 12 via the waterproof cover 3, the operability is good.

  When the portable power tool 1 having the above-described configuration is used in underwater work, the portable power tool body 2 is covered with the waterproof cover 3 and the air supply pipe 13 of the air pump 5 is attached to the waterproof cover 3. . Then, when the portable electric tool 1 is in the air, the air pump 5 is operated so that air is constantly supplied into the waterproof cover 3, and the work is performed underwater. In the case of the underwater work, for example, a work for removing and cleaning deposits on the shell surface of cultured shellfish such as oysters, the waterproof cover 3 with the operator taking out the upper body from the water surface and holding the air pump 5. The work is performed while the air pressurized by the pump 5 is fed into the inside. At that time, the air sent into the waterproof cover 3 is ejected to the outside through the opening 14 of the waterproof cover 3, thereby preventing water from entering the waterproof cover 3 from the opening 14. Therefore, the operation | work in water can be performed, without the portable electric tool main body 2 getting wet. When performing brushing for cleaning the deposits on the shells of cultured shellfish such as oysters, there is an advantage that the operation can be performed without taking out the cultured shellfish from the water.

  Although the above-described waterproof cover 3 has been shown to connect three divided ones, as shown in FIG. 7, the two waterproof cover members 3A and 3B are connected to each other to form one waterproof cover 3. Also good.

  In the above-described embodiment, the portable power tool main body 2 has been shown to be used with a tool 11 such as a grinding tool or a brush detachably attached. .

  FIG. 8 shows a hand-held portable electric tool body 2 provided with a saw 15 as a tool part so that a cutting operation can be performed. The portable electric tool main body 2 is interlocked with a battery 7 housed and arranged in the rear part of the housing 6, an electric motor 8 as a drive unit arranged on the front side of the battery 7, and an output shaft 9 of the electric motor 8. The tool mounting portion 19 is eccentrically shifted from the center of rotation of the reduction gear portion 16 that transmits rotational power at a reduced speed and the large-diameter gear 18 that is rotationally driven by the worm 17 of the reduction gear portion 16 and is pivotally supported at one end side. The saw 15 is pinned to the front end portion of the tool mounting portion 19.

  When the portable power tool main body 2 having the saw 15 is used in an underwater operation, a waterproof cover 3 (shown by an imaginary line in the figure) provided with a slit-like opening for inserting the saw 15 is covered with an air pump. Pressurized air can be sent from the gas discharge means such as 5 to the rear portion of the waterproof cover 3.

  Instead of the saw 15, as shown in FIGS. 9 and 10 (a) and 10 (b), a portable electric tool main body 2 provided with a clipper type mowing tool 20 as a tool portion may be used. In the cutting tool 20, the fixed blade 20 a is fixed to the housing 6, and the movable blade 20 b is attached to the tool attachment portion 19. The movable blade 20b is slidable in a fixed direction (front-rear direction) with the fixed blade 20a by a guide rail structure for preventing shaking.

  When the portable power tool main body 2 having the mowing tool 20 is used for underwater work, the waterproof cover 3 provided with a slit-like opening through which the mowing tool 20 is inserted is covered with a gas such as an air pump 5. Pressurized air can be sent from the discharge means to the rear of the waterproof cover 3.

  Moreover, it replaces with the said saw 15, and as shown in FIG. 11, it is good also as the portable electric tool main body 2 provided as a tool part as shown in FIG. The flange 21 fixes the fixed blade 21a to the housing 6 side, supports the movable blade 21b to be rotatable around the fulcrum P on the fixed blade 21a, and receives a pin receiver provided at the rear end of the movable blade 21b. A pin 23 provided at the front end portion of the tool mounting portion 19 is engaged with the notch portion 22 for use. With this configuration, when the tool mounting portion 19 provided eccentric to the large-diameter gear 18 is driven to swing as described above, the pin 23 moves the movable blade 21b around the fulcrum P via the notch portion 22. Will rock it.

  When the portable electric tool body 2 having the flange 21 is used in underwater work, the waterproof cover 3 provided with a slit-like opening through which the flange 21 is inserted is covered and waterproofed from a gas discharge means such as an air pump 5. Pressurized air can be sent to the rear part of the cover 3.

  It is not limited to the one that introduces pressurized gas from the outside into the waterproof cover as described above, and a small cylinder is provided in the portable electric tool body or the waterproof cover, and the gas from the cylinder is supplied to the waterproof cover. You may make it discharge from an opening part.

Overall plan view showing an example of a portable power tool FIG. 1 is a plan view of the portable power tool body of FIG. Side view of the portable power tool body of FIG. Sectional view of the portable power tool body of FIG. 1 is a partially broken plan view of the waterproof cover of FIG. Rear view of the waterproof cover in FIG. Plan view showing a modification of waterproof cover Sectional view of a portable power tool body with a saw as a tool A plan view showing a clipper-type mowing tool that can be provided as a tool in a portable electric tool body Side view (a) and front view (b) showing clipper-type cutting tool of FIG. A plan view (a) of the closed state of the heel that can be provided as a tool in the portable electric tool body, an enlarged plan view (b) of the base end portion of the heel, and a plane showing the open state (c) of the heel Figure

Explanation of symbols

2 Portable power tool body 3 Waterproof cover 4 Opening 5 Gas discharge means (air pump)
6 Case 7 Battery 8 Drive unit (electric motor)
11 Tool part

Claims (3)

A hand-held housing, a battery disposed in the housing, a tool portion exposed to the outside from the housing, a driving portion for driving the tool portion by the battery, and switching of a driving state of the tool portion A portable power tool body with a switch for manual operation to be performed;
A waterproof cover made of a soft resin that exposes the tool part to the outside through an opening, and covers the entire casing of the portable power tool body so that it can be used in water ;
Gas discharge means for discharging gas from the inside to the outside of the waterproof cover through the opening of the waterproof cover;
And having
The tool part is detachable by manual operation with respect to a tool mounting collet provided on the distal end side of the housing in a shaft part provided in the tool part ,
The waterproof cover is configured to cover up to the collet portion, and the opening of the waterproof cover is opened to a size that can be inserted to attach the shaft portion of the tool portion to the collet,
The tool part can be attached to and detached from the collet by manual operation via the waterproof cover,
The location corresponding to the position of the switch of the portable electric tool body in the waterproof cover is configured as a highly flexible region so that the switch can be operated by manual operation from the outside of the waterproof cover. A portable power tool characterized by that. The portable power tool according to claim 1, wherein
The portable electric tool characterized in that the gas discharge means is configured to be able to introduce pressurized gas into the waterproof cover from the outside through a location away from the opening in the waterproof cover. In the waterproof cover used for the portable electric tool according to claim 1 or 2,
The waterproof cover, which is divided into a plurality of parts, can be integrally connected through a waterproof connecting portion.

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