JP2011115919A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively protect an operation panel 23 from external force, by restraining the whole height low, while securing the grip length in a sufficient degree for gripping. <P>SOLUTION: This power tool is provided with a battery charger installing part 2a for detachably installing a battery charger 4 for supplying electric power to an electric motor 5 in a lower part of a grip 2, by arranging the grip 2 in a lower part of a tool body provided with the electric motor 5 and an operation mechanism driven by the electric motor 5. A front part of the battery charger installing part 2a is arranged so as to overhang to the front of the grip 2, and a recessed part 18 recessed downward is formed in the vicinity of a base part with the grip 2 on an upper surface of this overhang part 15, and the operation panel 23 is arranged on a bottom surface of this recessed part 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric tool having a rechargeable battery mounted on a lower part of a grip.

  In general, an electric power tool such as an impact driver is provided with a rechargeable battery, and a motor and a rotary impact mechanism are operated by electric power supplied from the rechargeable battery to tighten a screw.

  Recently, however, the number of switch buttons has been increasing in the tool body, such as turning on / off the motor, adjusting the rotational force, and adjusting the illumination light for the work spot. For example, a light on / off switch, a rechargeable battery level display switch, a rechargeable battery level display panel, and a striking force switching display unit. The operation panel provided with these switch buttons is usually disposed on the upper surface of the rechargeable battery mounting portion provided so as to protrude forward from the grip base at the lower part of the tool body (see Patent Documents 1 and 2). Since a motor and a rotary striking mechanism are provided inside the tool body, there is no extra space and it is difficult to provide the grip in terms of operability and handling. On the other hand, even if a light is provided on the upper surface of the rechargeable battery mounting portion, there is still a space, which is most suitable for providing an operation panel.

JP 2005-144564 A JP 2008-279564 A

  However, when the operation panel is arranged on the upper surface of the rechargeable battery mounting portion, the little finger of the hand easily comes into contact with the switch button when the grip is gripped. For this reason, the grip length must be increased. However, when the grip is lengthened, there is a problem that the overall height of the tool becomes large and the tool must be enlarged.

  Further, in the configuration in which the operation panel is simply arranged on the upper surface of the rechargeable battery mounting portion, external force is likely to act, and the operation panel may be damaged due to unexpected causes and may break down.

  The present invention solves the above-described problems, and provides an electric tool capable of suppressing the overall height to a low level while ensuring a sufficient grip length for gripping and effectively protecting an operation panel from an external force. Is the subject.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a grip at a lower portion of a tool body provided with an electric motor and an operation mechanism driven by the electric motor, and the electric power is supplied to the electric motor at a lower portion of the grip. In a power tool provided with a rechargeable battery mounting portion for detachably mounting a rechargeable battery for supplying a battery, a front portion of the rechargeable battery mounting portion is provided so as to protrude to the front of the grip. In the vicinity of the base portion with the grip, a recessed portion recessed downward is formed, and an operation panel is provided on the bottom surface of the recessed portion.

  The invention according to claim 2 is characterized in that, in claim 1, the rear portion of the recessed portion is formed so as to be continuous with the front surface portion of the base portion of the grip.

  According to a third aspect of the present invention, in the first or second aspect, the concave portion is formed at a portion where a little finger of a user's hand that holds the grip hits.

  According to the first aspect of the present invention, the front part of the rechargeable battery mounting part is provided so as to project forward from the grip, and a recess recessed downward is formed on the upper surface of the projecting part in the vicinity of the base part with the grip. Since the operation panel is provided on the bottom surface of the recessed part, the overall height is secured while the grip length is secured to a sufficient level even when the operation panel is provided on the rechargeable battery mounting part. In addition to being able to keep it low, it is difficult to reach the bottom of the recessed part even if an unexpected external force such as dropping the power tool or hitting another member is applied during operation, thus effectively protecting the operation panel can do.

  According to the invention of claim 2, since the rear part of the recessed part is formed so as to be continuous with the front part of the base part of the grip, there is no sense of incongruity even if the little finger of the user's hand hits it. Not damaged.

  According to the invention of claim 3, since the recessed portion is formed at a portion where the little finger of the user's hand holding the grip touches, it is possible to prevent the little finger from contacting the rechargeable battery mounting portion. it can. Therefore, even when the operation panel is provided in the rechargeable battery mounting portion, the work can be smoothly performed.

The perspective view which showed a part of impact driver which is embodiment of this invention in the cross section Side view of the above impact driver showing the gripped state in a simplified manner Enlarged sectional view of the rechargeable battery mounting part Perspective view of rechargeable battery mounting part

An embodiment of the present invention will be described for an impact driver. FIG. 1 is a perspective view showing a part of an impact driver in cross section. In FIG. 1, reference numeral 1 denotes a driver main body (tool main body). A grip 2 is formed in the lower portion of the driver main body 1, and a trigger 3 is disposed on the grip 2. A rechargeable battery mounting portion 2a is formed in the lower portion of the grip 2, and a rechargeable battery pack 4 is detachably provided on the rechargeable battery mounting portion 2a.

  The driver main body 1 is formed in a cylindrical shape and includes a front motor portion 1a and a rear power transmission portion 1b.

  The motor unit 1a is provided with an electric motor (DC brushless motor) 5 that supplies a rotational force as a power source of the power transmission unit 1b.

  Inside the power transmission unit 1b, a planetary gear mechanism 7, a spindle 8, a striking mechanism 9, and an anvil 10 are provided in series on the same axis as the rotating shaft 6 of the electric motor 5 from the rear side. A driver bit (not shown) can be attached to the tip of the anvil 10. As a result, the rotation of the electric motor 5 is decelerated and rotated by the planetary gear mechanism 7 and transmitted to the spindle 8, and the rotation of the spindle 8 is constituted by the hammer 11, the compression spring 12, etc., and generates a striking force. It is converted into a rotational striking force, and this rotational striking force is transmitted to the anvil 10 that is rotatably supported by the housing. The structure of such a power transmission part 1b is well-known.

  Next, the grip 2 has a shape in which the circumference of the lower part is made smaller than the circumference of the upper part and is easily gripped by a human hand. A thumb (not shown) is applied to the front side of FIG. A grip length is secured such that the index finger 13a is applied to the trigger 3 and the middle finger 13b, ring finger 13c, and little finger 13d are applied to the grip 2.

  The front portion of the rechargeable battery mounting portion 2 a is provided so as to project forward from the grip 2. As shown in FIGS. 2 and 3, a storage portion 17 for an LED (light emitting diode) light 16 is provided at the center of the front portion of the protruding portion 15. The light storage portion 17 is formed so as to protrude from the surface of the overhang portion 15, the front end opening portion thereof is directed obliquely upward, and the LED light 16 is provided so as to irradiate the vicinity of the tip of the driver bit.

  A recessed portion 18 is formed between the rear side of the light storage portion 17 and the front portion of the grip 2 at a portion where the little finger 13d of the user's hand holding the grip 2 hits. That is, the recessed portion 18 falls downward from the upper surface of the overhanging portion 15, the front wall 20 of the recessed portion 18 is continuous with the rear portion of the light storage portion 17, and the rear wall 21 of the recessed portion 18 is the front lower portion 2 b of the base of the grip 2. It is formed to be continuous. However, the left and right side portions 22 are continuously formed so as to be slightly higher than the upper surface of the overhanging portion 15. When the user grasps the grip 2, the index finger 13 a is applied to the portion of the trigger 3 except for the thumb, and the middle finger 13 b, ring finger 13 c, and little finger 13 d are applied to the grip 2 body. Since the concave portion 18 is formed in the portion where the concave portion 18 hits, and both the left and right sides of the concave portion 18 are substantially flush with the upper surface of the overhanging portion 15, the little finger 13d does not touch or does not touch the little finger 13d. Therefore, the operability is not impaired.

  An operation panel 23 is provided at the bottom of the recessed portion 18. The operation panel 23 is provided with a light on / off switch 24, a rechargeable battery level display unit 25, a retightening display unit 26, a striking force switching display unit 27, a striking force switching switch 28, and the like.

  Thus, since the recessed part 18 is formed in the site | part with which the little finger 13d of the user's hand holding the said grip 2 hits, it can prevent that the little finger 13d contacts the overhang | projection part 15 directly. Even in a state where the operation panel 23 is provided in the rechargeable battery mounting portion 2a, the operation can be smoothly performed. Further, since the operation panel 23 is provided at the bottom of the recessed portion 18, even if an unexpected external force such as dropping an impact driver or hitting another member is applied during the operation, the operation panel 23 is placed on the bottom of the recessed portion 18. Therefore, the operation panel 23 can be effectively protected. Moreover, since the rear part of the recessed part 18 is formed so that it may continue to the front part of the base part of the said grip 2, even if the little finger 13d of a user's hand hits, there is no sense of incongruity and operativity is not impaired.

  As described above, when the LED light 16 and the operation panel 23 are provided on the upper portion of the rechargeable battery mounting portion 2a, the thickness of the LED light 16 and the operation panel 23 is increased on the rechargeable battery mounting portion 2a, and the grip 2 is gripped. In addition, since it is necessary to prevent the user's little finger 13d from touching the operation panel 23, it is necessary to lengthen the grip 2. However, by forming the recessed portion 18 at the portion where the little finger 13d on the upper surface of the rechargeable battery mounting portion 2a contacts, it is possible to prevent the little finger 13d from contacting the rechargeable battery mounting portion 2a. Therefore, even when the operation panel 23 is provided in the rechargeable battery mounting portion 2a, the operability is not deteriorated while the grip length is secured to a level sufficient for grasping, and the overall height can be kept low. Can be effectively protected from external forces.

  In addition, the said recessed part is not limited to an impact driver. It can be applied to other power tools having a grip and a rechargeable battery.

1 Driver body (tool body)
2 Grip 2a Rechargeable battery mounting part 3 Trigger 4 Rechargeable battery pack (rechargeable battery)
5 Electric motor 13d Little finger 15 Overhang portion 18 Recessed portion

Claims (3)

A rechargeable battery in which a grip 2 is provided at the lower part of a tool body provided with an electric motor and an operating mechanism driven by the electric motor, and a rechargeable battery for detachably attaching power to the electric motor is provided at the lower part of the grip 2 In the electric tool provided with the mounting portion 2a,
A front portion of the rechargeable battery mounting portion 2a is provided so as to project forward of the grip 2, and a recessed portion 18 recessed downward is formed on the upper surface of the projecting portion 15 in the vicinity of the base with the grip 2. An electric tool characterized in that an operation panel 23 is provided on the bottom surface of the recessed portion 18.   The power tool according to claim 1, wherein a rear portion of the recessed portion is formed so as to be continuous with a front surface portion of a base portion of the grip.   The electric tool according to claim 1 or 2, wherein the concave portion (18) is formed at a portion where a little finger (13d) of a user's hand that holds the grip (2) hits.

Images