JP2007276038A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive power tool with the ease of operation for either of usual tightening work or hand tightening. <P>SOLUTION: A handle (12) has a knob-shaped portion constituted of the vicinity of a battery receiving portion (34) and a battery case (18). This power tool is structured so that when the handle portion (12) is grasped by one hand from the battery receiving portion (34) and the first finger, the second finger and the third finger of the hand is placed on an inclined surface (22) connecting the knob-shaped portion (21) with a portion nearer to the body (11) of the handle (12), the knob-shaped portion (21) is sandwiched between the first to the third fingers and the hand. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in operability of an electric power tool, and more particularly to an electric power tool provided with a handle capable of adjusting an angle between a pen shape and an L shape.

  In general, an electric power tool that performs a tightening operation such as an electric screwdriver or an electric wrench has a function of locking the rotation of the anti-tip tool holding portion, so that fine adjustment by hand tightening is possible. In particular, an electric power tool that extends in a pen shape from the body part and accommodates a battery in the handle part has the same hand as a hand-held tool by gripping the handle part from the side opposite to the tool holding part. Can be tightened.

Japanese Patent Laid-Open No. 05-301174

  In the conventional power tool, the force with which the hand rotates the power tool during the hand tightening operation greatly depends on the friction force acting between the hand and the handle portion. For this reason, there is a problem that the hand and the handle portion become slippery when the finger is tired after working for a long time.

  In addition, some electric tools have a soft friction layer with a soft layer such as elastomer on the handle to increase the coefficient of friction. However, when the handle is almost cylindrical, There is a problem that the hook is bad and it is difficult to put effort into it.

  There is also a power tool equipped with a handle that can adjust the angle between a pen shape and an L shape, and a soft layer such as an elastomer is arranged on the handle portion, but the handle portion is used when tightening downward in the form of an L shape handle. There is a problem that the hand holding the handle is easily displaced upward.

  In addition, there is a method in which a soft layer such as an elastomer is disposed on the battery case to increase the frictional force of the handle portion, but there is a problem that the cost increases.

  An object of the present invention is to solve the above problems and to provide an inexpensive electric tool having good operability in both normal tightening work and manual tightening work.

  A transmission mechanism unit having a tip tool holding unit, a motor for rotationally driving the transmission mechanism unit, a switch for controlling the motor, and a fuselage which is an outer frame for housing the transmission mechanism unit, the motor, and the switch A handle portion movably joined to an end portion of the body portion on the side opposite to the end tool holding portion, a battery receiving portion provided on an end portion of the handle portion on the side opposite to the body portion, and a battery receiving portion A battery that is detachably disposed, wherein the handle portion is aligned with the body portion from one end of the body portion on the side opposite to the tip of the body portion, and is pen-shaped when the angle is the smallest. In the electric tool that extends so as to form an L shape when the angle is the largest, the vicinity of the battery receiving portion of the handle portion is formed in a knob shape together with the case of the battery, Handle part Adjust the pen-handle form gripped from the battery receiving portion, good consuming finger when performing hand tightening work, easily focused, not offset with respect to the handle portion. Further, even when the handle portion is adjusted to an L-shaped handle and is gripped downward, the step of the knob-shaped forming portion serves as a stopper, so that the hand is not displaced upward. Therefore, both the pen-shaped handle and the L-shaped handle are hard to get tired of the finger, and even if the finger is tired and the force is reduced after working for a long time, the hand does not move with respect to the handle portion.

  Various shapes of the knob-shaped forming portion are conceivable. For example, the maximum outer diameter is about 45 mm, the handle portion is about 30 mm in the longitudinal direction, and the step difference between the handle portion and the body portion is about 4 mm. And it forms so that it may become a slope. In this way, the hook of the finger is improved, and the knob-shaped forming part is sandwiched between the finger along the slope and the palm applied to the battery case part, so that it is easy to apply force.

  Moreover, since the friction coefficient of the knob-shaped forming portion is increased by disposing the soft layer almost all around the knob-shaped forming portion, a large frictional force can be obtained. Therefore, the anti-slip effect is increased when the hand tightening operation is performed in the form of a pen-shaped handle.

  Also, by providing a margin of about 1 mm between the battery receiving portion side end and the soft layer, it is possible to suppress the occurrence of burrs at the end of the soft layer compared to the case where no margin is provided, and the number of deburring steps Is unnecessary, leading to cost reduction.

  According to the first aspect of the present invention, when the hand tightening operation is performed in the form of a pen-shaped handle, the finger is held with respect to the handle portion only by grasping the knob-shaped forming portion of the handle portion from the battery receiving portion side with a light force. It will not slip. In addition, even when the downward tightening operation is performed in the form of an L-shaped handle, the hand does not slip upward from the handle portion. Therefore, both the pen-shaped handle and the L-shaped handle are difficult to get tired of the finger, and even if the finger is tired and the gripping force on the handle is reduced after a long period of work, the hand does not move relative to the handle. Therefore, an electric tool with good operability can be provided.

  According to the configuration of the second aspect, since the friction coefficient of the knob-shaped forming portion is increased, a large frictional force can be obtained, and the anti-slip effect is increased when the hand tightening operation is performed in the form of a pen-shaped handle. . Further, by providing the soft layer up to the vicinity of the end surface of the battery receiving portion of the handle portion, the anti-slip effect of the handle portion can be enhanced without providing a soft layer on the surface of the battery case. Therefore, an inexpensive electric tool with good operability can be provided.

  According to the structure of Claim 3, the generation | occurrence | production of the burr | flash of a soft layer edge part can be suppressed, the deburring man-hour becomes unnecessary, and it leads to a cost reduction. Therefore, an inexpensive electric tool can be provided.

  A cordless driver 1 according to an embodiment of the present invention will be described with reference to FIGS.

  The internal structure of the cordless driver 1 will be described with reference to FIGS.

  The cordless driver 1 includes a gear portion 8 having a socket 9 that is a tip tool holding portion, a motor 6 that rotationally drives the gear portion 8, a switch 13 that controls the motor 6, a gear portion 8, the motor 6, and a gear. The housing 2 that is an outer frame that accommodates the portion 8 and the switch 13, the clutch 7 that adjusts the torque of the motor 6 transmitted via the gear portion 8, the clutch 7 is accommodated, and the torque can be adjusted in multiple stages. The clutch dial 5 and the handle 3 that at least partially accommodates the battery case 18 and extends parallel or at an angle to the body portion 11 are provided. The housing 2 forms a body portion 11 that houses the motor 6, the gear portion 8, and the switch 15. The handle 3 forms a handle portion 12 that at least partially accommodates the battery case 18.

  The handle portion 12 is provided so as to form a pen shape or an L shape together with the body portion 11 by rotating with respect to the pivot 26 of the flange screw 27 disposed at the joint portion with the body portion 11. Such a handle is called a pen-shaped handle and an L-shaped handle, respectively. The handle portion 12 is fixed by fitting a steel ball 28 disposed on the handle portion 12 side into a hole of a click plate 29 disposed on the body portion 11 side. When a certain force or more is applied in the rotation direction of the handle portion 12, the steel ball 28 is displaced from the hole of the click plate 29, and the handle portion 12 is rotated. When the handle portion 12 rotates by a certain angle, the steel ball 28 is fitted into another hole of the click plate 29, and the handle portion 12 is fixed.

  The motor 6 is provided in parallel with the socket 9, and the torque of the motor 6 is transmitted to the socket 9 through the gear portion 8 that is a transmission mechanism portion and the clutch 7. When the upper part of the switch 13 is pushed when viewed from the front, the power of the battery 19 is supplied to the motor 6 and the socket 9 starts to rotate clockwise as viewed from the motor 6 side. Further, when the lower part of the switch 13 is pressed when viewed from the front, electric power is supplied to the motor 6 and the socket 9 starts to rotate counterclockwise when viewed from the motor 6 side. The switch 13 is provided with an on-lock knob 14 for holding the switch 13 in a pressed state. When the switch 13 is pressed and then the on-lock knob 14 is slid in the direction of the switch 13, the switch 13 is turned on. Locked in state. The on-lock knob 14 is used for omitting the operation of the switch 13 in the operation of continuously tightening the screws.

  The gear unit 8 is provided with a speed change switch 15 that adjusts the rotational speed. By sliding the speed change switch 15 back and forth, the speed of the gear portion 8 can be adjusted in two stages.

  The outer frame of the cordless driver 1 will be described with reference to FIGS. 1 to 3 and FIGS. 5 to 7.

  The housing 2 includes a housing 2a and a housing 2b which are divided into left and right, and are combined with each other by a plurality of screws (not shown). As described above, the housing 2 forms the body portion 11 that houses the motor 6, the gear portion 8, and the switch 13. The handle 3 includes a handle 3a and a handle 3b which are divided into left and right, and are combined by a plurality of screws (not shown). As described above, the handle 3 forms the handle portion 12 that houses the battery case 18, and the handle portion 12 extends from one end of the body portion 11 on the side opposite to the socket 9, and forms a pen shape or an L shape with the body portion 11. It is provided as follows. The switch 15 is provided in the body portion 11, and in the vicinity of the joint portion with the handle portion 12 so that the first finger (thumb) can press the switch 13 when grasped in the form of an L-shaped handle as shown in FIG. Arranged. Further, as shown in FIG. 9, the first finger (thumb) is arranged so that the switch 13 can be pressed when the body portion is gripped in order to perform a more precise tightening operation.

  The improvement of operability by the knob-shaped forming portion 21 will be described.

  The handle portion 12 extends in the direction of the body portion 11 from the battery receiving portion side, has at least a maximum outer diameter of about 45 mm, about 30 mm in the longitudinal direction of the handle portion, and a step L with respect to the portion of the handle portion 12 near the body portion 11. A knob-shaped forming portion 21 having a length of about 4 mm is provided.

  The maximum outer diameter portion of the knob-shaped forming portion 21 has a step L of about 4 mm with respect to the portion near the body portion 11 of the substantially cylindrical handle portion 12 and is connected by an inclined surface of about 25 °. As shown in FIG. 10, when the handle 33 of the conventional power tool 32 is gripped by the first finger, the second finger, and the third finger from the battery receiving side, the force applied to the fingertip is directed in the direction of the center line of the handle 33. The force applied to the palm contacting the battery case is parallel to the center line of the handle 33 and downward in FIG. In this state, if the first finger, the second finger and the third finger are not gripped with strong force, the first finger, the second finger and the third finger are likely to slip and come off from the handle 33. If there is a step of about 4 mm between the maximum outer diameter portion of the knob-shaped forming portion 21 and the portion of the handle portion 12 near the body portion 11 as in the present invention, and connected by a slope 22 of about 25 °, the first finger In addition, the fingertips of the second finger and the third finger come into contact with the inclined surface 22, and it becomes easy to apply a force to the first finger, the second finger, and the third finger in a direction parallel to the center line of the handle portion 11. Further, the palm is in strong contact with the palm in contact with the battery case 18 so as to sandwich the knob-shaped portion 21. In this state, the first finger, the second finger, and the third finger are hooked so as to stick to the slope, and do not slip even if not much force is applied to the first finger, the second finger, and the third finger. However, if the step L is smaller than 4 mm, the first finger, the second finger, and the third finger are not easily caught on the inclined surface 22.

  In addition, even when the downward tightening operation is performed in the form of an L-shaped handle, the slope 22 serves as a stopper, so that the hand is not displaced above the handle portion. Therefore, the finger is hard to get tired, and even if the finger is tired and the force is reduced by working for a long time, the finger is not displaced with respect to the handle part.

  The improvement of operability by the soft layer 24 will be described.

  The handle 3 includes a hard layer 25 made of nylon resin or the like, and a soft layer 24 made of soft elastomer or the like provided on the surface of the hard layer 25. The soft layer 24 is provided so as to protrude from the surface of the hard layer 20 and is formed so as to cover a range of approximately 50% or more of the entire handle 3. The soft layer 24 is provided at a portion that grips the handle portion 12 when working mainly as a slip stopper. A soft layer 24 is also formed on the surface of the knob-shaped forming portion 21, and when the handle portion 12 is gripped from the battery receiving side, the first and second fingers and the second finger applied to the inclined surface 22 of the knob-shaped forming portion 21. The three fingers are difficult to slip. Further, as shown in FIGS. 1 to 4, a margin of about 1 mm in width is provided between the battery receiving portion side end portion of the handle portion 12 and the soft layer 24. Thereby, it becomes difficult to generate | occur | produce a burr | flash at the edge part of the soft layer 24 at the time of shaping | molding. Therefore, the deburring man-hour is not required, and the cost can be reduced. Therefore, inexpensive products can be supplied.

  The operation of the cordless driver 1 will be described with reference to FIGS.

  The switch 13 is kept pressed. When the on-lock button 14 is pressed to lock the switch 13 in the on state, the first finger can be released from the switch 13 and various gripping methods can be performed. As shown in FIG. 6, when the knob-shaped forming portion 21 is gripped by the first finger, the second finger, and the third finger, the first finger, the second finger, and the third finger are caught on the inclined surface 22, and further, the knob-shaped forming portion 21. Can be sandwiched between the palm and the touch, as if the slope 22 sticks to the finger. Also, the finger is less likely to slip due to the frictional force with the soft layer 24. Thereby, the gripping force can be small.

  As shown in FIG. 8, when the cordless driver 1 is tightened with the screw 31 to the building material 30 from the vertical direction in the L-shaped handle form, the handle portion 12 is inclined with respect to the body portion 11, so Easily slips above 8. However, according to the present embodiment, since the slope 22 is a stopper as described above, the hand is difficult to slip. Further, as described above, since the step L between the handle portion 12 and the knob-shaped forming portion 21 is formed to be at least partly 4 mm or more, the upward slipping of the hand is surely prevented by the slope 22. The Further, as described above, since the soft layer 24 is formed over the entire surface of the knob-shaped forming portion 21, the hand does not hurt. Moreover, a large frictional force can be obtained, and the effect of preventing slipping can be further increased.

  The present invention is not limited to the cordless driver 1 and can be applied to various electric tools including a pen-shaped handle and an L-shaped handle.

The front view of the pen-shaped handle form of the cordless driver according to the embodiment of the present invention The top view of the pen-shaped handle form of the cordless driver concerning this embodiment of the invention The front view of the L-shaped handle form of the cordless driver concerning an embodiment of the invention Cross-sectional view of the overall structure of a cordless driver according to an embodiment of the present invention Sectional drawing in the AA line of FIG. The top view of the pen-shaped handle form which shows the state which hold | gripped the knob-shaped formation part of the cordless driver concerning embodiment of this invention Sectional drawing in the BB line of FIG. The front view of the L-shaped handle form which shows the state which hold | gripped the handle | steering-wheel part of the cordless driver concerning embodiment of this invention The front view of the pen-shaped handle form which shows the state which hold | gripped the trunk | drum part of the cordless driver concerning embodiment of this invention Reference drawing showing the state where the handle part of a conventional power tool is gripped from the anti-tip tool holding part side

Explanation of symbols

1 is a cordless driver, 2, 2a and 2b are housings, 3 and 3a and 3b are handles, 4 is a cover, 5 is a clutch dial, 6 is a motor, 7 is a clutch, 8 is a gear section, 9 is a socket,
10 is a driver bit, 11 is a body part, 12 is a handle part, 13 is a switch, 14 is an on-lock knob, 15 is a shift switch, 16 is an LED light, 17 is a light switch, 18 is a battery case, 19 is a battery, 20 is Contact, 21 is a knob-shaped forming part, 22 is a slope, 23 is a margin, 24 is a soft layer, 25 is a hard layer, 26 is a pivot, 27 is a flange screw, 28 is a steel ball, 29 is a click plate, 30 is a mating material , 31 is a screw, 32 is a power tool, 33 is a handle, 34 is a battery receiver

Claims (3)

A transmission mechanism portion having a tip tool holding portion;
A motor that rotationally drives the transmission mechanism,
A switch for controlling the motor;
A body part that is an outer frame that houses the transmission mechanism part, the motor, and the switch;
A handle portion movably joined to an end of the body portion on the side opposite to the tool holding portion;
A battery receiving portion provided at an end of the handle portion on the side opposite to the body portion;
A battery detachably disposed on the battery receiving portion;
An electric tool comprising
The handle portion is formed in a pen shape when the angle is the smallest, and an L shape when the angle is the largest, together with the body portion from one end of the body portion on the side opposite to the tool holding portion. In power tools that can adjust the angle,
The power tool according to claim 1, wherein the handle portion is formed in a knob shape in the vicinity of the battery receiving portion together with the case of the battery. The portable tool according to claim 1, wherein a soft layer is formed on substantially the entire circumference of the knob-shaped forming portion of the handle portion. The portable tool according to claim 2, wherein the handle part is provided with a margin between the battery receiving part side end part and the soft layer.

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