JP5541444B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool such as a cordless hammer drill that uses a battery as a power source, and more particularly to a power tool that can securely hold a detachable battery without rattling on the power tool body.

  In power tools such as hammer drills, cordless type power tools using a battery as a power source are widely used. As an example of such a cordless type hammer drill, the electric tool of Patent Document 1 is known. In the electric tool of Patent Literature 1, a battery that is detachably provided includes a pair of rail portions that extend in parallel to the upper surface portion of the battery, a connection terminal, and a lock mechanism. This battery is attached by the rail portion engaging with a pair of slide rails provided in the battery holding portion of the electric tool body. When the battery is attached, the battery is held by the lock mechanism so that the battery does not fall out of the battery holding unit. Moreover, the connection terminal of a battery contacts the connection terminal provided in the electric tool main body, and electric power is supplied from the battery to the electric tool main body.

JP 2003-220579 A

  In the electric tool as shown in Patent Document 1, the pair of slide rails provided in the battery holding part of the electric tool main body and the rail part formed in the battery are either for the purpose of facilitating the sliding of the battery. In general, the upper and lower thickness dimensions and the left and right width dimensions are formed to be slightly smaller, and a slight gap is provided. This is because if there is no gap, the battery cannot be slid onto the battery holding portion. However, due to the presence of this gap, there may occur a phenomenon in which the battery vibrates asynchronously with respect to the power tool body during work of the power tool. In particular, in an impact tool such as a hammer drill, the vibration generated in the tool body during work tends to be large, and therefore, the battery tends to generate more vibration with respect to the tool body. It is desired to reduce the occurrence of such asynchronous vibration as much as possible, and the applicants have made various improvements in order to reduce the asynchronous vibration.

  The present invention has been made in view of the above background, and an object thereof is to provide an electric tool that can stably hold a detachable battery on the electric tool body without rattling.

  Another object of the present invention is to provide a power tool capable of suppressing relative vibration of a battery with respect to the power tool body.

  Still another object of the present invention is to provide an electric tool that can reduce the intrusion of dust into the connection terminal portion by mounting the electric tool body and the battery without any gap.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, a motor, a power transmission mechanism that transmits the rotational force of the motor to drive the tip tool, a housing that houses the motor and the power transmission mechanism, and a motor that is detachably attached to the housing In the electric tool having a battery for supplying electric power to the housing, the housing has a cylindrical body portion that houses the motor and the power transmission mechanism, a handle portion that extends substantially vertically from the body portion, and a battery holder that holds the battery. The battery holding portion is provided with a lock mechanism for fixing the battery, and the housing is provided with a holding band for holding the battery so as not to vibrate with respect to the housing. The holding band is made of a stretchable material and is disposed along the outer peripheral surface of the battery. The holding band has a fixed end on one end side fixed to the housing, and a free end on the other end side is detachably attached to a locking portion formed on the housing.

  According to another aspect of the present invention, the lock mechanism includes a guide rail and a latch mechanism that slidably hold the battery, and the holding band is disposed across a plurality of surfaces of the battery. For example, when the battery is mounted while sliding from the front to the rear of the electric tool, the front and bottom surfaces may be held by the holding band. The holding band is made of rubber, and a wide portion that is widened in an intermediate region from the fixed end to the free end is formed. It is preferable to form a cut-through portion in the wide portion.

  According to still another feature of the present invention, a through hole is provided in the vicinity of the free end of the holding band, a locking hook is provided in the housing, and the holding hole is extended by locking the through hole to the locking hook while holding the holding band. The battery is pressed against the housing by the elasticity of the band. A depression for guiding the free end of the holding band is formed in the vicinity of the locking hook of the housing. The fixed end is fixed above the battery of the battery holding unit. Further, it is preferable that the housing has an abutting surface that is formed on a surface different from the surface on which the rail portion is formed and one side of the battery faces, and a damper member that abuts a part of the battery is provided on the abutting surface.

  According to still another aspect of the present invention, the motor, a power transmission mechanism that transmits the rotational force of the motor to drive the tip tool, a housing that houses the motor and the power transmission mechanism, and a detachable attachment to the housing. In an electric tool having a battery for supplying electric power to a motor, the housing is provided with a rail portion that slidably holds the battery in a pair with the rail of the battery, and is provided on the opposite side of the surface of the battery to which the rail is attached. A holding band that presses at least two surfaces of the surface (for example, the bottom surface) and a surface (for example, the front surface) different from the opposite surface is provided.

According to the present invention, since the lock mechanism for fixing the battery to the battery holding portion of the electric tool is formed and the holding band for holding the battery so as not to vibrate with respect to the housing is provided in the housing, the electric tool main body Asynchronous vibration of the battery can be suppressed. In addition, since the battery always vibrates at the same cycle as the electric power tool body, it is possible to suppress battery contact failure due to asynchronous vibration. In addition, because the holding band is made of a stretchable material and is placed along the outer peripheral surface of the battery, it is possible to prevent rattling during battery installation by simply adding an inexpensive holding band. Asynchronous vibrations of the battery can be suppressed.

According to the present invention, since the holding band has the fixed end fixed to the housing and the free end is detachably attached to the engaging portion formed on the housing, the battery can be easily fixed using the holding band. it can. In addition, since one end of the holding band is fixed to the housing, it is possible to prevent the holding band from being lost when the locking state to the locking portion is released.

According to the present invention, the lock mechanism is configured to include a rail portion and a latch mechanism for slidably holding the battery, and the holding band is arranged over a plurality of surfaces of the battery. Thus, it is possible to apply a pressing force to at least a plurality of directions, to prevent rattling when the battery is attached, and to suppress asynchronous vibration of the battery with respect to the electric tool body.

According to the present invention, the holding band is made of rubber, and the holding band can be realized with a material rich in stretchability and excellent in vibration damping characteristics. Moreover, since the wide part which a width | variety spreads in the intermediate area | region from a fixed end to a free end is formed, a battery can be stably hold | maintained in a wide area | region. Furthermore, since the cut-through portion is formed in the wide portion of the holding band, an increase in the weight of the holding band can be prevented, and appropriate stretchability can be ensured even if the width is wide.

According to the present invention, the through-hole is provided near the free end of the holding band, the locking hook is provided in the housing, and the through-hole is locked to the locking hook while extending the holding band. A retaining band can be secured to the housing. In addition, since the recess is formed in the vicinity of the locking hook of the housing, the free end of the holding band does not come into contact with the housing and bends. Therefore, the holding band is locked to the locking hook in a natural state and is stable. In this state, the free end of the holding band can be fixed to the housing. Furthermore, since the fixed end is fixed above the battery of the battery holding portion, it is possible to prevent the holding band from drooping greatly downward from the electric tool even if the locking state on the free end side is released.

According to the present invention, the housing is provided with the abutting surface that faces one side of the battery, and the damper member that abuts a part of the battery is provided on the abutting surface, so that the relative vibration of the battery with respect to the electric tool body is suppressed. be able to. Furthermore, when the battery is removed from the electric tool body, the damper member is pressed in the direction of removing the battery, so that the battery can be slid and removed with a small force, and the operability can be improved.

According to the present invention, the housing is provided with the rail portion for slidably holding the battery, and at least two surfaces of the battery, the surface opposite to the surface on which the rail is attached and the surface different from the surface on the opposite side, are provided. As a result, it is possible to suppress the battery's asynchronous vibration with respect to the power tool body, and the battery always vibrates at the same cycle as the power tool body. Can be suppressed.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a side view of the hammer drill which concerns on the Example of this invention. It is a figure for demonstrating the housing shape of the hammer drill 1 of FIG. It is a front view of the hammer drill which concerns on the Example of this invention. It is a bottom view of the hammer drill which concerns on the Example of this invention. It is a perspective view which shows the hammer drill which concerns on the Example of this invention. It is a figure for demonstrating the procedure which removes the battery 31 from the hammer drill 1 of FIG. FIG. 3 is a view for explaining a procedure for attaching a battery 31 to the hammer drill 1 of FIG. 1 and removing a battery band 41; It is a fragmentary perspective view which shows the structure of the battery holding | maintenance part of the hammer drill 1 of FIG. It is a perspective view which shows the external appearance of the battery 31 of FIG. It is a top view of the battery band 41 single-piece | unit of FIG. It is a side view of the battery band 41 single-piece | unit of FIG. It is a bottom view of the battery band 41 single-piece | unit of FIG. It is a perspective view which shows the structure of the fixed end side of the battery band 41 of FIG. It is a side view which shows the state which mounted | wore the battery 51 of a different size to the hammer drill 1 which concerns on the Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In this specification, description will be made assuming that the front, rear, left, right, and up and down directions are directions shown in the drawing.

  FIG. 1 is a side view of a hammer drill according to an embodiment of the present invention. The hammer drill 1 includes a power transmission mechanism (not shown) that uses a motor (not shown) as a drive source and transmits a rotational force or a striking force to a tip tool (not shown) by the rotation of the motor. As the specific internal configuration, various known configurations can be used, and the motor and the power transmission mechanism are accommodated in the housing. The housing of the hammer drill 1 is composed of two parts, a rear housing 2 and a front housing 3. The rear housing 2 has a split structure that is divided into left and right parts on a vertical plane that passes through the axial direction (front-rear direction) of the hammer drill 1, and the divided rear housing 2 is fixed by a plurality of screws 19. The front housing 3 is formed in a cylindrical integrated structure continuous in the circumferential direction, and is fixed to the front side of the rear housing 2 with a plurality of screws 20.

  A handle portion 2b for an operator to hold by a hand is formed so as to extend from the motor housing portion 2a of the rear housing 2 in a substantially perpendicular direction. A trigger switch 6 is provided inside the handle portion 2b and directly below the motor housing portion 2a so as to protrude forward from the handle portion 2b. A slide type forward / reverse switch 9 for setting the rotation of the motor is provided above the trigger switch 6. On the front side of the handle portion 2b of the rear housing 2, a battery holding portion 2c for holding the battery 31 to be mounted is formed.

  Although not shown, a power transmission mechanism such as a striking mechanism unit or a rotation transmission mechanism unit is accommodated in the front housing 3. In addition, since the concrete structure of the hammering mechanism part and rotation transmission mechanism part in a hammer drill should just use a well-known structure, description here is abbreviate | omitted. A tip tool mounting portion 7 is formed on the front side of the front housing 3, and a side handle 8 is provided in the vicinity thereof. An arbitrary tool such as a drill bit, an anchor setter, or a driver bit can be mounted on the tip tool mounting portion 7 in accordance with the usage of work.

  A battery 31 is detachably attached to the battery holding portion 2c. The electric power of the battery 31 is supplied to the motor via the trigger switch 6 and a control circuit board (not shown). A plurality of secondary batteries are included inside the casing of the battery 31, and for example, a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, or the like can be used as these secondary batteries. The battery 31 has a plurality of voltages such as 14.4 V, 24 V, and 36 V, for example, and there are batteries having the same voltage but different capacities. The hammer drill 1 in the present embodiment is capable of mounting a plurality of types of batteries 31 such as a 24V2.0Ah nickel-metal hydride battery and a 25.2V3.0Ah lithium ion battery, and is a battery of the same voltage and having a capacity. Can be mounted (usually the outer dimensions, especially the height of the battery are different).

  As a characteristic configuration of the hammer drill 1 according to the present embodiment, a battery band 41 is provided in order to stably hold the battery 31 attached to the battery holding portion 2c. The battery band 41 is a band for holding a battery made of a material having a high elasticity such as rubber, and is one end side at a position indicated by an arrow 16 (that is, above the battery 31). The (upper end) is fixed to a part of the rear housing 2, and the other end (lower end) is locked to a locking hook 5 formed on a part of the rear housing 2.

  FIG. 2 is a view for explaining the housing shape of the hammer drill 1 of FIG. It is arbitrary how the housing of the hammer drill 1 is manufactured, but in this embodiment, the housing is constituted by a rear housing 2 and a cylindrical front housing 3 connected to the front thereof. Both of these are preferably made of synthetic resin such as reinforced plastic for weight reduction, but the front housing 3 may be made of a metal material such as an aluminum alloy, or both may be made of a metal alloy. . The entire housing configured in this manner is functionally composed of three parts: a body part, a handle part 2b, and a battery holding part 2c.

  The body portion shown in FIG. 2 is composed of a motor housing portion 2a of the front housing 3 and the rear housing 2, and is preferably formed in a cylindrical shape in order to accommodate a cylindrical motor or the like. The handle portion 2b is a portion that is held by an operator during work, and extends downward from the body portion. An auxiliary line 14 indicates the axis passing through the rotation axis of the motor in the body portion, and the extending direction of the auxiliary line 14 is the axial direction. Further, the auxiliary line 15 indicates the center line of the handle portion 2b, and the auxiliary lines 14 and 15 have an angle of about 90 degrees (actually about 90 to 120 degrees).

  The battery holding portion 2c is located in front of the handle portion 2b and below the front housing 3. In the hammer drill 1 of this embodiment, the battery holding portion 2c is formed integrally with the rear housing 2, and the battery holding portion The part 2c has a shape in which the lower part of the handle part 2b and the battery holding part 2c are connected by the connecting part 2d. The structure of the battery holding portion 2c is configured to correspond to the shape of the battery to be mounted.

  FIG. 3 is a front view of the hammer drill 1 according to the embodiment of the present invention. As can be understood from the drawing, the front housing 3 is fixed to the rear housing 2 by four screws 20. Further, a side handle 8 is provided on the front side of the front housing 3 (note that a grip grip of the side handle 8 is omitted). A depth gauge 17 is provided near the attachment portion of the side handle 8. The depth gauge 17 is used to adjust the drilling depth. When the tip tool drills a hole with a desired depth, the depth gauge 17 is fixed so that it abuts the work material. Can open.

  From the vicinity of the arrow 16 of the battery holding part 2c, the battery band 41 is arranged to extend downward. The battery band 41 is configured such that the upper end is fixed to the rear housing 2 and extends downward from the upper end with a certain width. The upper end portion may be fixed so as to be sandwiched between the divided portions of the rear housing 2 or may be fixed by other known methods. The battery band 41 is preferably configured to be replaceable. For this replacement, the plurality of screws 19 of the rear housing 2 may be loosened and replaced, or a fixing structure that can be easily detached without loosening the screws 19. It is also good. A recessed portion 43 a is formed slightly below the upper end of the battery band 41. The recess 43 a is provided mainly for the reason of design of the battery band 41. Below the concave portion 43a of the battery band 41, it branches to the left and right at the position indicated by the arrow 43b to form two bands, and extends downward while widening the interval.

  FIG. 4 is a bottom view of the hammer drill 1 according to the embodiment of the present invention. The battery band 41 branches left and right at the position of the arrow 43b (see FIG. 3) and extends to a distance of a width W3. Here, since the width of the bottom surface of the battery 31 is W, the width W3 has a width of about 70%, so that the battery 31 can be stably held by the two bands. Further, the battery band 41 is formed with a connecting portion 43d for connecting two bands branched to the left and right after extending to the distance of the width W3. As described above, since the connecting portion 43d that connects the bands separated by left and right is provided, the distance between the separated bands can be kept constant. Further, the opposite side (free end side) of the connecting portion 43 becomes the cut-out portion 43e again and branches left and right at the point of the arrow 43f, and the two bands are joined again. A through hole 44 for engaging with the locking hook 5 is formed at the joined portion, and then connected to the free end 42. The handle portion 2b of the rear housing 2 is formed in a left-right divided type, and a locking hook 5 is formed from both divided housings. A recess 18 for accommodating a free end 42 which is the tip of the battery band 41 is formed on the handle 2b of the rear housing 2 on the rear side of the hook 5 for locking.

  FIG. 5 is a perspective view showing a hammer drill 1 according to an embodiment of the present invention. FIG. 6 shows a state in which the grip grip of the side handle 8 is attached. A change lever 26 is provided on the side of the front housing 3. The change lever 26 is a changeover switch for setting the operation mode of the hammer drill 1, and can be switched to one of three modes of “blow”, “rotation + blow”, and “rotation” by turning the change lever 26. it can. As can be understood from FIG. 1 to FIG. 5, it will be understood that the other configuration of the hammer drill 1 is not changed by newly attaching the battery band 41. In order to implement the present invention in the conventional hammer drill 1, it is possible to fix the battery band 41 at a part of the rear housing 2 (in the vicinity of the arrow 16), and the hook portion 5 and the recess portion 18 ( Both are formed as shown in FIG.

  FIG. 6 is a view for explaining the procedure for removing the battery 31 from the hammer drill 1. To remove the battery 31 from the battery holding portion 2c, the engagement state of the battery band 41 with the locking hook 5 is released, and the free end 42 of the battery band 41 is moved in the direction of the circle 1 arrow. Next, when the latches 32 on both the left and right sides of the battery 31 are pushed together, the latching claw 33 is pulled into the inside to release the locked state, and the battery 31 is moved along the rail means in the direction indicated by the circle 2 arrow, that is, Pull it forward. When the rail 31 of the battery 31 is pulled out forward and the guide by the guide rail on the main body side is released, the removal of the battery 31 is completed. Since the latch 32 and the latching claw 33 are composed of the same parts, the latching claw 33 moves in synchronization with the inside when the right and left latches 32 of the battery 31 are pushed in.

  When the battery 31 is attached to the hammer drill 1, it may be attached in the reverse order of FIG. FIG. 7 is a view for explaining a procedure for attaching the battery 31 to the hammer drill 1 and removing the battery band 41. When the rail portion of the battery 31 is attached to the guide rail of the rear housing 2, the latching claw 33 engages with a notch portion of the guide rail described later, whereby the battery 31 is locked to the battery holding portion 2c. In this state, the battery 31 can be sufficiently held. In this embodiment, the battery band 41 is further disposed so as to cover the front surface 37d and the bottom surface 37c of the battery 31, and the free end 42 of the battery band 41 is manually held. The through hole 44 is engaged with the locking hook 5 while the battery band 41 is extended by being pulled.

  Here, in a state where the through hole 44 is engaged with the locking hook 5, the dimensions of the battery band 41 are set so that the battery band 41 is slightly extended from a steady state where no tensile force is applied. . With this setting, the elastic force of the battery band 41 causes a force to press the battery 31 backward as indicated by an arrow 38a and a force to press the battery 31 upward as indicated by an arrow 38b. As a result, the battery 31 can be firmly attached to the main body of the hammer drill 1, and even if the hammer drill 1 vibrates during work, the battery 31 also vibrates in synchronization with the main body side, so the relative positional relationship between the hammer drill 1 and the battery 31. The phenomenon that the connection terminal on the main body side vibrates following the vibration of the battery 31 can be prevented. Further, since the battery 31 is firmly held while being pressed in the directions of the arrows 38a and 38b using the elastic force of the battery band 41, the gap between the main body of the hammer drill 1 and the battery 31 can be eliminated, and dust is connected to the connection terminal portion. It is possible to greatly reduce intrusion.

  FIG. 8 is a partial perspective view showing the structure of the battery holding portion 2c of the hammer drill 1 of FIG. The rear housing 2 is formed with a battery mounting surface 24 and an abutting surface 21 formed perpendicular to the battery mounting surface 24. Two guide rails 12 formed at parallel intervals are formed on the battery mounting surface 24 to guide the slide insertion of the battery 31. The guide rail 12 is engaged with a rail 34 described later formed on the battery 31. One notch 13 is formed on the front side of each guide rail. The notch 13 is engaged with a locking claw 33 formed on the battery 31, and realizes a lock function that prevents the battery 31 from being detached from the guide rail 12. A terminal block substrate 10 is provided in the vicinity of the center of the battery mounting surface 24, and metal terminals 11 a and 11 b that are fitted to terminals to be described later of the battery 31 are formed on the terminal block substrate 10. For example, the terminal 11a is a plus terminal and the terminal 11b is a minus terminal. The battery mounting surface 24 is provided with a rib 25 for limiting the type of battery to be mounted. This restricts the type of battery (particularly voltage difference) that can be mounted depending on the presence or absence of the rib 25 or its position, and only a battery having a notch at a position corresponding to the rib 25 is mounted on the battery holding portion 2c. can do.

  Slide insertion to the front of the battery 31 is limited by a stopper portion (described later) formed on the battery 31 coming into contact with the abutting portion 23. At this time, the rear surface 37 b (see FIG. 6) of the battery 31 does not contact the abutting surface 21. Therefore, in this embodiment, an elastic body 22 made of rubber or the like is attached to the abutting surface 21. The elastic body 22 serves as a damper member, and suppresses relative vibration of the battery 31 with respect to the main body of the hammer drill 1. In this embodiment, the elastic body 22 is provided on the rear housing 2 side, but may be provided on the rear surface 37b side of the battery 31.

  Next, the shape of the battery 31 will be described with reference to FIG. FIG. 9 is a perspective view showing an appearance of the battery 31 of FIG. The battery 31 is configured by a vertically divided housing that is an upper housing and a lower housing, and includes a plurality of cylindrical secondary batteries inside. A plurality of female terminals are provided as the terminals 35 on the upper surface 37 a of the battery 31. Further, two rails 34 that engage with the guide rails 12 (see FIG. 8) of the battery holding portion 2 c are formed on the side of the upper surface 37 a of the battery 31. A locking claw 33 is provided below the front side of the rail 34, and the locking claw 33 can protrude from the rail 34 in the vertical direction, and engages with the notch 13 provided in the hammer drill 1 in the protruding state. . The latching claw 33 and the latch 32 are connected inside, and the latching claw 33 is pulled inward in the vertical direction from the rail 34 by pushing the latch 32. A stopper 36 for restricting movement of the battery 31 in the mounting direction is formed behind the upper surface 37a so as to abut against the abutting portion 23 (see FIG. 8) of the battery holding portion 2c.

  What is characteristic of this embodiment is that the surface forming the outer periphery of the battery 31 in the extending direction of the rail 34, that is, all four surfaces of the upper surface 37a → the rear surface 37b → the bottom surface 37c → the front surface 37d It is to be held by the battery band 41. The upper surface 37a of the battery 31 is held by the battery mounting surface 24 (see FIG. 8) of the battery holding portion 2c through the guide rail 12, and the rear surface 37b is held by the abutting surface 21 (see FIG. 8) through the elastic body 22. The bottom surface 37 c and the front surface 37 d of the battery 31 are held by the battery band 41. As described above, in this embodiment, since the battery 31 is held on all the surfaces forming the outer periphery in the rail extending direction, the battery 31 can be fixed to the hammer drill 1 very stably.

  Although not shown in FIG. 9, a vent hole connected to the inside of the battery 31 may be provided at an arbitrary position, for example, the rear surface 37b. This ventilation port is used as an air path for cooling the inside by a fan when the battery 31 is connected to a charger (not shown). When the battery 31 is mounted on the battery holding portion 2c, the elastic body 22 (see FIG. 8) may be configured to cover the ventilation port so as to block dust from entering the inside.

  Next, a specific shape of the battery band 41 will be described with reference to FIGS. 10 is a top view of the battery band 41 alone, FIG. 11 is a side view of the battery band 41 alone, FIG. 12 is a bottom view of the battery band 41 alone, and FIG. 13 is a fixed end side of the battery band 41. It is a perspective view which shows the structure. The battery band 41 is made of rubber having a thickness d of about 5 mm, for example, and a blade portion 46 and a pressing portion 45 are formed on the fixed end side fixed to the battery holding portion 2c. The blade portion 46 has a cylindrical shape extending in a direction perpendicular to the longitudinal direction of the battery band 41, and protrudes by a predetermined length on both sides in the vertical direction with respect to the width W <b> 1 of the battery band 4. By forming a cylindrical hole portion for accommodating the protruding blade portion 46 in the vicinity of the arrow 16 (see FIG. 5) of the rear housing 2, and inserting the hole portion 46 so as to fit the blade portion 46. The battery band 41 is held so as not to fall out of the rear housing 2. The pressing portion 45 formed on the side portion of the blade portion 46 serves as a stopper that suppresses movement in one direction when the battery band 41 swings around the blade portion 46, and also buffers movement in that direction. To play a role.

  A thin portion 47 is formed in the vicinity of the blade portion 46 so that the battery band 41 can easily hold the folded state when the battery 31 is held. On the other hand, the damper portion 48 serves as a stopper that suppresses the movement in the opposite direction when the battery band 41 swings around the blade portion 46, and the damper portion 48 contacts one end of the thin portion 47. Here, since the holding portion 45, the blade portion 46, and the damper portion 48 are accommodated inside the rear housing 2, these are normally invisible from the outside of the hammer drill 1.

  The free end 42 of the battery band 41 is formed in a cylindrical shape having a circular cross section when viewed from the side. The shape of the free end 42 is arbitrary, and it is not necessarily required to be a cylindrical shape. The free end 42 may be configured to have a certain step so that an operator can easily pinch and pull it. Further, since the free end 42 is accommodated in the recess 18 of the rear housing 2 at an angle, the free end 42 may be configured to fit in the recess 18 and to have a size and shape that can easily be touched by an operator's finger when removed. . In this embodiment, the width W2 on the free end side is wider than that on the fixed end side W1. This is so that the battery band 41 stably contacts the lower surface of the rear housing 2 when the through hole 44 is locked to the locking hook 5.

  A portion between the free end 42 and the fixed end side of the battery band 41 is formed with a wide portion that is widened to about a width W3, and two hollow portions 43c and 43e are formed in the wide portion. Further, a connecting portion 43d is formed between the two cut-out portions 43c and 43e. The portions around the cut-out portions 43c and 43e of the battery band 41 and the connecting portion 43d serve as a ground contact surface with the floor when the hammer drill 1 is placed on the floor in the direction of FIG. 5, and the battery band 41 places the hammer drill 1 on the floor. It plays the role of shock absorbing material. Therefore, the hammer drill 1 can be stably held by increasing the area formed by the cut-through portions 43c and 43e to some extent. As described above, since the battery band 41 is made of rubber having a thickness of about 5 mm, it has a sufficient buffering effect and can greatly reduce the impact transmitted to the hammer drill 1 when placed on the floor.

  As described above, according to the present embodiment, since the housing is provided with the holding band that holds the battery so as not to vibrate with respect to the housing, the battery can be prevented from being vibrated asynchronously with respect to the electric tool body. Oscillates at the same cycle as the electric power tool body, so that it is possible to suppress battery contact failure caused by asynchronous vibration. In addition, the holding band is made of a stretchable material and is arranged along the outer peripheral surface of the battery, so it is possible to prevent rattling during battery installation simply by adding a holding band that can be prepared at low cost. The tool life can be extended.

  In addition, since the battery band 41 of the present embodiment is made of rubber and has elasticity, it can be used even when batteries having different sizes are mounted. FIG. 14 shows a state in which a battery 51 having a larger vertical size than the battery 31 is attached. As shown in FIG. 14, when the battery 51 having a large vertical size is attached, the downward protrusion amount H is larger than the lower surface of the rear housing 2. However, since the battery band 41 is made of rubber and easily extends, it can be attached without any problem. In addition, since the recess 18 is formed on the free end side of the battery band 41, the battery band 41 is bent even when the battery band 41 is locked to the locking hook 5 with a large angle. Can be stably held without any problems.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiment, the example of the hammer drill has been described as an example of the power tool. However, the power tool is not limited to the hammer drill, and may be any other power tool as long as the power tool uses a detachable battery. Further, the shape, material, and fixing method of the battery band are not limited to the structure of the above-described embodiment, and any shape can be used. For example, even if the battery band as a whole does not have elasticity, it may be constituted by an arbitrary band, belt, or the like as long as a member such as a spring is provided. Furthermore, the upper end of the battery band may be detachable, and the battery band may be configured to be replaceable depending on the battery to be attached.

DESCRIPTION OF SYMBOLS 1 Hammer drill 2 Rear housing 2a Motor accommodating part 2b Handle part 2c Battery holding part 2d Connection part 3 Front housing 3 Rear housing 3b Handle part 3c Battery holding part 5 Locking hook 6 Trigger switch 7 Tip tool mounting part 8 Side handle 9 Positive Reverse switch 10 Terminal block board 11 Terminal 12 Guide rail 13 Notch 14 Auxiliary line 15 Auxiliary line 16 Arrow 17 Depth gauge 18 Recessed part 19 Screw 20 Screw 21 Abutting surface 22 Elastic body 23 Abutting part 24 Battery mounting surface 25 Rib 26 Change Lever 31 Battery 32 Latch 33 Locking claw 34 Rail 35 Terminal 36 Stopper portion 37a Upper surface 37b Rear surface 37c Bottom surface 37d Front surface 37e Right surface 37f Left surface 38 Notch 41 Battery band 42 Free end 43 Connecting portion 43a Recessed portion 43d connecting portion 43e cut through portion 44 through hole 45 holding portion 46 blade portion 47 thin portion 48 damper portion 51 battery

Claims (11)

A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing has a cylindrical body portion that houses the motor and the power transmission mechanism, a handle portion that extends substantially perpendicularly from the body portion, and a battery holding portion that holds the battery,
The battery holding portion is provided with a lock mechanism for fixing the battery,
The lock mechanism includes a rail portion and a latch mechanism that slidably holds the battery,
The battery is held so as not to vibrate with respect to the housing, and a rubber holding band disposed over a plurality of surfaces of the battery is fixed to the housing ,
The electric power tool according to claim 1, wherein the holding band is formed with a wide portion that is widened in an intermediate region from a fixed end to a free end . The power tool according to claim 1 , wherein a hollow portion is formed in the wide portion of the holding band. A through hole is provided near the free end of the holding band, a locking hook is provided on the housing,
The electric tool according to claim 2 , wherein the battery is pressed against the housing by elasticity of the holding band by locking the through hole with the locking hook while extending the holding band. A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing has a cylindrical body portion that houses the motor and the power transmission mechanism, a handle portion that extends substantially perpendicularly from the body portion, and a battery holding portion that holds the battery,
The battery holding portion is provided with a lock mechanism for fixing the battery,
A holding band for holding the battery so as not to vibrate with respect to the housing is provided on the housing ,
A through hole is provided near the free end of the holding band, a locking hook is provided on the housing,
Forming a recess in the vicinity of the locking hook of the housing;
An electric tool characterized in that the battery is pressed against the housing by elasticity of the holding band by locking the through hole with the locking hook while extending the holding band . A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing has a cylindrical body portion that houses the motor and the power transmission mechanism, a handle portion that extends substantially perpendicularly from the body portion, and a battery holding portion that holds the battery,
The battery holding portion is provided with a lock mechanism for fixing the battery,
A holding band that holds the battery against vibration with respect to the housing is fixed to the housing ,
A through hole is provided near the free end of the holding band, a locking hook is provided on the housing,
The battery is pressed against the housing by the elasticity of the holding band by locking the through hole to the locking hook while extending the holding band,
The electric tool according to claim 1, wherein a fixed end of the holding band is fixed above the battery of the battery holding portion . A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing has a cylindrical body portion that houses the motor and the power transmission mechanism, a handle portion that extends substantially perpendicularly from the body portion, and a battery holding portion that holds the battery,
The battery holding portion is provided with a lock mechanism for fixing the battery,
The lock mechanism includes a rail portion and a latch mechanism that slidably holds the battery,
The battery is held so as not to vibrate with respect to the housing, and a holding band is provided on the housing, which is arranged across a plurality of surfaces of the battery ,
The housing is formed on a surface different from the surface on which the rail portion is formed, and has a contact surface on which one side surface of the battery faces,
An electric tool comprising a damper member that abuts a part of the battery on the abutting surface . A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing is provided with a rail portion that slidably holds the battery in pairs with the battery rail,
A holding band that presses at least two surfaces of a surface of the battery opposite to the surface on which the rail is attached and a surface different from the surface on the opposite side ;
The power tool is characterized in that the holding band is made of rubber, and a wide portion is formed in a middle area extending from a fixed end to a free end to the housing . The electric tool according to claim 7, wherein a hollow portion is formed in the wide portion of the holding band. A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing is provided with a rail portion that slidably holds the battery in pairs with the battery rail,
A holding band that presses at least two surfaces of a surface of the battery opposite to the surface on which the rail is attached and a surface different from the surface on the opposite side;
A through hole is provided near the free end of the holding band, a locking hook is provided on the housing,
Forming a recess in the vicinity of the locking hook of the housing;
An electric tool characterized in that the battery is pressed against the housing by elasticity of the holding band by locking the through hole with the locking hook while extending the holding band . A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing is provided with a rail portion that slidably holds the battery in pairs with the battery rail,
A holding band that presses at least two surfaces of a surface of the battery opposite to the surface on which the rail is attached and a surface different from the surface on the opposite side;
A through hole is provided near the free end of the holding band, a locking hook is provided on the housing,
The battery is pressed against the housing by the elasticity of the holding band by locking the through hole to the locking hook while extending the holding band,
The electric tool characterized in that a fixed end of the holding band to the housing is fixed above the battery . A motor,
A power transmission mechanism for transmitting the rotational force of the motor to drive the tip tool;
A housing for housing the motor and the power transmission mechanism;
In the electric tool having a battery that is detachably attached to the housing and supplies power to the motor,
The housing is provided with a rail portion that slidably holds the battery in pairs with the battery rail,
A holding band that presses at least two surfaces of a surface of the battery opposite to the surface on which the rail is attached and a surface different from the surface on the opposite side;
The housing has an abutting surface that is formed on a surface different from the surface on which the rail portion is formed and that one side of the battery faces,
An electric tool comprising a damper member that abuts a part of the battery on the abutting surface .

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