JP2008229740A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool capable of improving freedom in layout of a substrate by preventing foreign matter such as sand and dust from entering into a part where the substrate is placed, even if the substrate is placed between a battery and a lever. <P>SOLUTION: An angle screwdriver (power tool) 1 includes the battery 2 mounted at an end of a housing 6, a motor 3 driven by the battery 2 as a power source, a lever switch 22 for turning ON/OFF the power to the motor 3 from the battery 2 by a turning operation of the lever 23, a power transmission mechanism for transmitting motive energy of the motor 3 to a tip tool 5, and the substrate 26 for displaying at least a residual amount of the battery 2 on a control panel 27. The substrate 26 is placed between the battery 2 and the lever 23, and, in addition, a rib 6E for isolating the substrate 26 from the lever 23 is formed on the housing 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric tool including a lever switch that turns on / off power supply from a battery to a motor by a lever turning operation.

  A rotary impact tool as one form of an electric tool is a tool that generates rotational impact force using a motor as a drive source to rotate a tip tool, and intermittently applies impact force to this to perform operations such as screw tightening. However, it is widely used at present because of its features such as small recoil and high tightening ability. This rotary impact tool includes an angle driver that has been devised to solve problems such as being unable to perform screw tightening work with a normal tool because it is a narrow place.

  The angle driver employs a structure in which a bevel gear is arranged between the motor and the hammer or between the hammer and the tip tool to change the direction of torque transmission by 90 °. If you want to increase the tightening torque, A bevel gear is disposed between the hammer and the hammer, and when it is desired to reduce the center height, the bevel gear is disposed between the hammer and the tip tool.

  As an advantage of this type of angle driver, the center height can be reduced so that the screw can be tightened to a place where a normal driver cannot work, and the front and rear ends of the screwdriver can be gripped. Another example is the use of a lever switch so that work can be performed.

By adopting the above lever switch, for example, when tightening screws, it is possible to work by grasping the front of the housing, so that the screw camout can be reduced, and the hand can be used in high places or narrow places such as the ceiling. When a screw tightening operation or the like is performed on a portion where it is difficult to reach, there is an advantage that the operation can be performed by gripping the rear of the housing. Patent Documents 1 and 2 disclose power tools that employ lever switches.
Japanese Utility Model Publication No. 7-033579 Japanese Utility Model Publication No. 7-033580

  However, in the conventional electric tool provided with a lever switch, since the lever is separated from the housing outside the range of the operating point from the lever fulcrum, the portion through which the lever movable part of the housing penetrates is adopted. A gap is inevitably generated, and sand or dust can easily enter the housing through the gap, and a board with electronic components cannot be mounted between the battery and the lever. There was a problem that the degree was limited.

  The present invention has been made in view of the above problems, and the purpose of the present invention is to prevent foreign matter such as sand and dust from entering the portion where the substrate is disposed even if the substrate is disposed between the battery and the lever. An object of the present invention is to provide a power tool that can increase the degree of freedom in the layout of a substrate by preventing the problem.

  In order to achieve the above object, the invention according to claim 1 is directed to a battery mounted on an end of a housing, a motor driven by using the battery as a power source, and a rotation operation of a lever from the battery to the motor. In a power tool comprising a lever switch for turning on / off power feeding, a power transmission mechanism for transmitting the power of the motor to a tip tool, and a board connected to the battery, the board is placed between the battery and the lever. The rib is formed in the housing while being arranged and separating the substrate and the lever.

  According to a second aspect of the present invention, in the first aspect of the present invention, a bag-like lever accommodating portion is formed in the housing, and a part of the lever on the pivot fulcrum side is accommodated in the lever accommodating portion. And

  According to a third aspect of the present invention, in the second aspect of the present invention, a discharge port is formed in the bottom wall of the lever housing portion.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the operation panel is arranged on a surface of the housing facing the lever of the battery mounting portion.

  According to the first aspect of the present invention, the substrate is disposed between the battery and the lever, and the rib for separating the substrate and the lever is formed in the housing, so that sand, dust, etc. on the portion where the substrate is disposed Intrusion of foreign objects is reliably prevented by the ribs. For this reason, it becomes possible to arrange | position a board | substrate between a battery and a lever, and the freedom degree on the layout of this board | substrate is raised.

  According to the second aspect of the present invention, since the bag-shaped lever storage portion is formed in the housing, and a part of the lever on the pivoting fulcrum side is stored in the lever storage portion, foreign matter enters the movable portion of the lever. This is prevented by the lever storage portion, and the entry of foreign matter into the portion where the substrate is disposed can be prevented more reliably.

  According to the third aspect of the present invention, even if a foreign object enters the lever housing portion, the foreign material is discharged to the outside from the discharge port formed in the bottom wall of the lever housing portion. There is no accumulation, and there is no problem that the operability of the lever is damaged by foreign matter.

  According to the fourth aspect of the present invention, since the operation panel is disposed on the surface of the housing facing the lever of the battery mounting portion, that is, on the place where the operator's hand may not touch during the operation, the operation panel is provided on the operation panel. Occurrence of a malfunction such as malfunction of the electric tool due to the operator's hand touching the operation button or the like by mistake is prevented.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a side sectional view of an angle driver according to Embodiment 1 of the present invention, FIG. 2 is a bottom view of the angle driver, and FIG. 3 is a partial perspective view of an operation panel portion of the angle driver.

  The angle driver 1 according to the present embodiment is a cordless hand-held type that uses a battery 2 as a power source and a motor 3 as a drive source, and drives the rotary impact mechanism by the motor 3 to rotate and strike the anvil 4. When applied, the rotary impact force is intermittently transmitted to the tip tool (bit) 5 to perform operations such as screw tightening.

  Specifically, as shown in FIG. 1, the slide type battery 2 is mounted on one end of an elongated housing 6 of the angle driver 1, and the motor 3 is built in a substantially central portion in the longitudinal direction of the housing 6. A rotary impact mechanism is housed in front of the motor 3 (the upper side in FIG. 1 is the front). The housing 6 includes a motor housing 6A and a hammer case 6B that are connected to each other.

  In the rotary impact mechanism, the rotation of the output shaft (motor shaft) of the motor 3 is decelerated via the planetary gear mechanism 7 and transmitted to the spindle 8, and the spindle 8 is driven to rotate at a predetermined speed. Here, the spindle 8 and the hammer 9 are connected by a cam mechanism. The cam mechanism is formed on a V-shaped spindle cam groove 8 a formed on the outer peripheral surface of the spindle 8 and an inner peripheral surface of the hammer 9. The V-shaped hammer cam groove 9a and the ball 10 that engages with the cam grooves 8a and 9a.

  Further, the hammer 9 is always urged by the spring 11 in the distal direction (upward in FIG. 1), and at a position separated from the end face of the anvil 4 by the engagement between the ball 10 and the cam grooves 8a and 9a when stationary. Thus, a minute gap is formed between the two. And although not shown in figure, the convex part which selectively engages is formed in two places on the rotation plane which the hammer 9 and the anvil 4 mutually oppose, respectively. The anvil 4 is rotatably supported by the metal bearing 12 at its outer periphery.

  One end (rear end) of an intermediate shaft 14 rotatably supported by two bearings 13 is spline-fitted to the shaft central portion of the anvil 4, and the other end (front end) of the intermediate shaft 14 is fitted to the other end (front end). A bevel gear 15 is integrally formed.

  The front end of the housing 6 is bent at a right angle downward, and the output shaft 16 is disposed at a right angle (perpendicular) to the intermediate shaft 14 at that portion. The output shaft 16 is rotatably supported at two axial points by bearings 17 and 18, and a bevel gear 19 is integrally formed at an intermediate portion thereof, and the bevel gear 19 is integrated with the bevel gear 15 of the intermediate shaft 14. Is engaged. The tip tool 5 is detachably attached to the output shaft 16.

  Further, an LED cover 20 is formed at the lower front end of the housing 6 (hammer case 6B), and an LED light 21 for illumination is accommodated in the LED cover 20. The LED light 21 irradiates the tip tool 5 with LED light from a circular hole 20a formed in the LED cover 20, particularly in a dark place.

  On the other hand, a lever switch 22 for turning on / off the power supply from the battery 2 to the motor 3 is accommodated behind the motor 3 in the housing 6, and an actuator 22 a of the lever switch 22 is provided on the housing 6. It penetrates the bottom and protrudes downward. When the operating element 22 a is pushed by the lever 23, the lever switch 22 is turned on and power is supplied from the battery 2 to the motor 3. The lever 23 is disposed below the housing 6, and one end of the lever 23 is formed by the roll pin 24. 6 is pivotally mounted so as to be pivotable up and down.

  By the way, in the present embodiment, a bag-like lever storage portion 6C that opens toward the front is integrally formed at the lower portion of the rear end of the housing 6 where the lever 23 is provided. A part (second half part) of the lever 23 is accommodated inside. Here, when the angle driver 1 is not operated, the lever 23 is pushed by the actuator 22a of the lever switch 22 and is urged in the clockwise direction in FIG. 1 about the roll pin 24, as shown by a solid line in FIG. It is stationary in an open state (OFF state) in contact with the bottom surface of the lever storage portion 6C. A discharge port 6a that is long in the width direction is formed in the innermost portion of the bottom wall of the cover storage portion 6C near the roll pin 24 (see FIG. 2). The size of the discharge port 6a is the finger of the operator's hand. It is set to a size that does not enter.

  Further, in the present embodiment, a substrate 26 is connected in series between the battery 2 and the lever 23, next to the battery terminal 25 inside the battery mounting portion 6 </ b> D formed integrally with the rear end portion of the housing 6. Is arranged. As shown in FIG. 3, an operation panel 27 is provided on the surface of the housing 6 facing the lever 23 of the battery mounting portion 6 </ b> D. The amount is displayed and the LED light 21 is instructed to be turned on / off.

  Thus, in the present embodiment, the substrate 26 is arranged in series between the battery 2 and the lever 23 as described above. However, as shown in FIG. Are integrally formed.

  In order to perform the screw tightening operation using the angle driver 1 configured as described above, the housing 6 is gripped and the lever 23 is pulled. Then, the lever 23 rotates about the roll pin 24 to the position of the broken line in FIG. 1 to press the actuator 22a of the lever switch 22, so that the lever switch 22 is turned on and power is supplied from the battery 2 to the motor 3. 3 is activated.

  When the motor 3 is started as described above, the rotation of its output shaft (motor shaft) is decelerated by the planetary gear mechanism 7 and transmitted to the spindle 8 as described above, and the spindle 8 is driven to rotate at a predetermined speed. Is done. When the spindle is driven eight times in this way, the rotation is transmitted to the hammer 9 via the cam mechanism, and the protrusion of the hammer 9 is engaged with the protrusion of the anvil 4 before the hammer 9 is rotated halfway. The anvil 4 is rotated together. When the relative reaction occurs between the hammer 9 and the spindle 8 by the engagement reaction force at that time, the hammer 9 moves along the spindle cam groove 8a of the cam mechanism. Starts to move back to the motor 3 side while compressing.

  When the protrusion of the hammer 9 moves over the protrusion of the anvil 4 due to the backward movement of the hammer 9 and the engagement of both protrusions is released, the hammer 9 receives the spring 11 in addition to the rotational force of the spindle 8. While being accelerated rapidly in the rotational direction and forward by the action of the elastic energy accumulated in the cam and the cam mechanism, it moves forward by the urging force of the spring 11, and the convex portion re-engages with the convex portion of the anvil 4. Start to rotate together. At this time, a strong rotational impact force is applied to the anvil 4, and this rotational impact force is transmitted to the tip tool 5 through the intermediate shaft 14 and the output shaft 16, and the rotational impact force from the tip tool 5 to a screw (not shown). Is transmitted. Since the rotation of the intermediate shaft 14 is converted by 90 ° by the bevel gears 15 and 19 and transmitted to the output shaft 16, the output shaft 16 and the tip tool 5 mounted on the output shaft 16 are rotationally driven while maintaining a substantially vertical state. The

  Thus, the same operation as described above is repeated, and the rotational impact force is intermittently and repeatedly transmitted from the tip tool 5 to the screw, and the screw is screwed into the wood to be fastened.

  As described above, in the present embodiment, since the substrate 26 is disposed between the battery 2 and the lever 23 and the rib 6E that separates the substrate 26 and the lever 23 is formed in the housing 6, the portion where the substrate 26 is disposed. Intrusion of foreign matter such as sand and dust into the wall is reliably prevented by the rib 6E. For this reason, it becomes possible to arrange | position the board | substrate 26 in series between the battery 2 and the lever 23, and the freedom degree on the layout of this board | substrate 26 is raised.

  In the present embodiment, the housing 6 is formed with a bag-like lever storage portion 6C, and a part (second half portion) of the lever 23 on the roll pin 24 side is stored in the lever storage portion 6C. Intrusion of foreign matter into the portion is prevented by the lever storage portion 6C, and entry of foreign matter into the portion where the substrate 26 is disposed is more reliably prevented. In the present embodiment, even if a foreign object enters the lever storage portion 6C, the foreign material is discharged to the outside from the discharge port 6a formed in the bottom wall of the lever storage portion 6C. Foreign matter does not accumulate inside, and the malfunction that the operability of the lever 23 is harmed by the foreign matter does not occur.

  Furthermore, in the present embodiment, the operation panel 27 is disposed on the surface of the housing 6 that faces the lever 23 of the battery mounting portion 6D, that is, on the place where the operator's hand may not touch during the operation. Occurrence of problems such as malfunction of the angle driver 1 due to an operator's hand accidentally touching an operation button such as an ON / OFF button of the LED light 21 provided in the LED light 21 is prevented.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is a side sectional view of an angle driver according to Embodiment 2 of the present invention. In FIG. 4, the same elements as those shown in FIG. 1 are denoted by the same reference numerals. Description of is omitted.

  The angle driver 1 ′ according to the present embodiment uses a plug-in type as the battery 2, and is characterized in that the substrate 26 is disposed below the battery terminal 25, and the other configuration is the above-described embodiment. 1 is the same as that of the angle driver 1 according to FIG.

  Therefore, in the present embodiment, the same effect as in the first embodiment can be obtained, and even if the substrate 26 is disposed between the battery 2 and the lever 23, sand, dust, etc. on the portion where the substrate 26 is disposed. The degree of freedom in the layout of the substrate 26 can be increased by preventing the entry of foreign matter.

  Although the present invention has been described with respect to an embodiment in which the present invention is applied particularly to an angle driver, the present invention is naturally applicable to any other electric tool provided with a lever switch.

It is a sectional side view of the angle driver which concerns on Embodiment 1 of this invention. It is a bottom view of the angle driver which concerns on Embodiment 1 of this invention. It is a fragmentary perspective view which shows the operation panel part of the angle driver which concerns on Embodiment 1 of this invention. It is a sectional side view of the angle driver which concerns on Embodiment 2 of this invention.

Explanation of symbols

1,1 'Angle driver (power tool)
2 battery 3 motor 4 anvil 5 tip tool 6 housing 6A motor housing 6B hammer case 6C housing lever housing 6D housing battery mounting portion 6E housing rib 6a discharge port 7 planetary gear mechanism 8 spindle 8a spindle cam groove 9 hammer 9a hammer cam Groove 10 Ball 11 Spring 12 Metal bearing 13 Bearing 14 Intermediate shaft 15 Bevel gear 16 Output shaft 17, 18 Bearing 19 Bevel gear 20 LED cover 20a LED cover circular hole 21 LED light 22 Lever switch 22a Lever switch operator 23 Lever 24 Roll pin 25 Battery terminal 26 Substrate 27 Operation panel

Claims (4)

A battery mounted on the end of the housing, a motor driven by using the battery as a power source, a lever switch for turning on / off power supply from the battery to the motor by a lever turning operation, and power of the motor In a power tool comprising a power transmission mechanism for transmitting to a tip tool and a substrate connected to the battery,
An electric power tool characterized in that the substrate is disposed between the battery and the lever, and a rib is formed in the housing for separating the substrate and the lever.   2. The electric tool according to claim 1, wherein a bag-like lever storage portion is formed in the housing, and a part of the lever on the rotation fulcrum side is stored in the lever storage portion.   The power tool according to claim 2, wherein a discharge port is formed in a bottom wall of the lever housing portion.   The electric tool according to claim 1, wherein the operation panel is disposed on a surface of the battery mounting portion of the housing facing the lever.

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