JP5053791B2 - Impact tool - Google Patents

Description

  The present invention relates to an illumination technique that is suitably used for hammering work in a work place such as a dark place or at night in a hammering tool that performs a straight hammer work on a workpiece.

  For example, Japanese Patent Application Laid-Open No. 2003-117854 (Patent Document 1) discloses a technique that includes a lighting tool so that hammering work can be performed in a dark place without any trouble. The impact tool described in the publication extends in a direction intersecting with the long axis direction of the tool body at the rear end of the tool body with the hammer bit attached to the tip (front end) region, that is, on the opposite side of the hammer bit. In the hammer having a configuration in which the handgrip is provided, the end of the handgrip is provided with an illuminating tool that irradiates the tip region (processing work site) of the hammer bit.

However, in the case of a configuration in which a lighting device is arranged on the handgrip, there is a possibility that light may be blocked by a finger depending on how the operator grips the handgrip, and there is still room for improvement in this respect.
JP 2003-117854 A

  An object of the present invention is to provide a technique that is effective in reliably irradiating an area around the tip of a tool bit in an impact tool.

  In order to achieve the above object, a preferred form of the impact tool according to the present invention is an impact tool for performing a predetermined processing operation on a workpiece by an impact operation in the long axis direction of a tool bit, a tool main body, a grip portion, A motor and a drive mechanism; The tool body has a first housing and a second housing. The grip portion is connected to the tool body. The drive mechanism drives the tool bit linearly by converting the rotational output of the motor into a linear motion and operating linearly in a direction crossing the rotational axis direction of the motor. The first housing accommodates the motor and extends in the rotation axis direction of the motor. The second housing accommodates the drive mechanism and extends in the long axis direction of the tool bit so that the tool bit can be attached to the tip region. The first housing and the second housing are connected to each other in an intersecting manner, thereby forming a tool body. The “predetermined hammering work” in the present invention includes not only a hammering work in which the tool bit performs only a linear striking operation, but also a hammer drilling work in which a linear striking operation and a circumferential rotation operation are performed. .

According to the preferable form of the impact tool which concerns on this invention, it further has an illuminating device. The lighting device includes a light emitting unit that illuminates a peripheral region of the tool bit including the tip of the tool bit, and an electric wire that supplies current to the light emitting unit. The light emitting portion is disposed in a concave accommodating portion formed at the end of the first housing, and is accommodated by a brush holder unit that is assembled to the first housing from a direction intersecting the long axis direction of the tool bit. It is set as the structure pressed down and fixed to the wall surface . In this way, by arranging the light emitting portion of the lighting device in the end region of the first housing, the light emitting portion is irradiated with light emitted from the light emitting portion, the region around the tip of the tool bit, that is, the work material by the tool bit. It arrange | positions in the irradiation possible area | region which can illuminate the process work site | part. The “light emitting unit” in the present invention is typically constituted by a light source and a case in which the light source is mounted and accommodated. And as a "light source", an LED light, an incandescent bulb, a fluorescent lamp, etc. can be applied suitably.
According to the present invention, the light emitting portion of the lighting device is installed in the end region of the first housing, so that the light of the light emitting portion can be lighted by the operator's fingers during a hammering operation or a hammer drilling operation at night or in a dark place. The area around the tip of the tool bit can be reliably illuminated by the light emitting part without being blocked, and the work can be performed in a bright state. Thereby, a striking tool effective in improving the workability of the processing work in a dark place or the like is provided. In addition, since a functional component called a brush holder unit is used as a pressing tool for the light emitting unit, the number of parts is reduced and the structure is simplified or the cost is reduced compared to a configuration in which a dedicated pressing tool is set separately. It becomes effective.

According to a further embodiment of the impact tool of the present invention, the brush holder unit is configured to have at least elastically deformable base portion. The brush holder unit is configured such that, in the state where it is assembled to the first housing, the light emitting portion is pressed in a resilient manner from the assembling direction by the base portion, thereby restricting the movement of the light emitting portion. The “elastically deformable base portion” in the present invention suitably includes a mode in which the material constituting the base portion itself has elasticity and a mode in which it is configured to exhibit elasticity in terms of shape or structure. To do.
According to this invention, it is set as the structure which controls the motion of the said light emission part by pressing down a light emission part using the elasticity of the base part in a brush holder unit. This prevents deflection of light by the backlash of easily emitting portion occur during operation, the tip peripheral region of the tool bit Ru can be irradiated stably.

Moreover, according to the further form of the impact tool which concerns on this invention, the accommodation path | route which accommodates an electric wire was comprised by the brush holder unit assembled | attached to the 1st housing and the said 1st housing.
In the impact tool having a configuration in which the first housing and the second housing constituting the tool body are connected to each other in a crossing manner on the opposite side of the tip region to which the tool bit is mounted, the first housing for housing the motor is provided. An intake window that draws in outside air for cooling may be set in the end region (brush holder unit arrangement side). For this reason, when working with a striking tool on a concrete wall or floor, dust generated by the work can be sucked into the housing together with the outside air from the intake window, and the electric wire of the lighting device can be damaged by the dust. There is sex. However, according to the present invention, since the electric wire of the lighting device can be accommodated in the accommodating path constituted by the first housing and the brush holder unit, the brush holder unit prevents direct interference of dust with the electric wire, Durability can be improved.

  According to the present invention, in the impact tool, a technique effective for reliably irradiating the peripheral region of the tip end of the tool bit is provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. This embodiment will be described using an electric hammer drill as an example of an impact tool. FIG. 1 is a side view showing a part of the overall configuration of the electric hammer drill according to the present embodiment. FIG. 2 is an enlarged view of a portion A in FIG. 3 and 4 are views of the motor housing with the housing cover removed as seen from below (the lower side of FIG. 1), FIG. 3 shows the brush holder unit before mounting, and FIG. 4 shows the brush holder. It shows after unit installation.

  As shown in FIG. 1, the hammer drill 101 according to the present embodiment generally includes a main body 103 that forms an outline of the hammer drill 101, and a tool holder (on the left side in the drawing) of the main body 103. For the sake of convenience, a hammer bit 119 that is detachably mounted via a hand grip 109 and a hand grip 109 gripped by a user connected to the opposite side of the hammer bit 119 of the main body portion 103 are mainly configured. The main body 103 corresponds to the “tool main body” in the present invention, the hammer bit 119 corresponds to the “tool bit” in the present invention, and the hand grip 109 corresponds to the “grip portion” in the present invention. The hammer bit 119 is held by a tool holder in a state where relative reciprocation in the long axis direction is possible and relative rotation in the circumferential direction is restricted. For convenience of explanation, the hammer bit 119 side is referred to as the front, the hand grip 109 side is referred to as the rear, and the vertical direction intersecting the major axis direction of the hammer bit 119 is referred to as the vertical direction.

The main body 103 includes a motor housing 105 that houses the drive motor 111, and a gear housing 107 that houses the motion conversion mechanism 113, the striking element 115, and the power transmission mechanism 117. The drive motor 111 corresponds to the “motor” in the present invention. The motor housing 105 corresponds to the “first housing” in the present invention, and the gear housing 107 corresponds to the “second housing” in the present invention. The drive motor 111 is arranged such that the rotation axis is in the vertical direction (vertical direction in FIG. 1) substantially orthogonal to the long axis direction of the main body 103 (that is, the long axis direction of the hammer bit 119).
As described above, in the so-called L-shaped hammer drill 101 in which the rotation axis of the drive motor 111 is orthogonal to the major axis direction of the hammer bit 119, the motor housing 105 that houses the drive motor 111 is in the direction of the rotation axis of the motor 111. That is, it extends in a direction intersecting with the extending direction of the gear housing 107 extending in the major axis direction of the hammer bit 119. The motor housing 105 and the gear housing 107 are connected so as to be substantially L-shaped on the opposite side of the hammer bit 119. This L-type connection corresponds to “connected in a crossing manner” in the present invention.

  The drive motor 111 includes a rotating shaft 131, an armature 133 that rotates integrally with the rotating shaft 131, a stator 135 that is fixed to the motor housing 105, a commutator 137 that is provided on one end side (lower end side) of the rotating shaft 131, The brush holder unit 161 arranged outside the commutator 137 is mainly configured. One end side (lower end side) of the rotating shaft 131 is rotatably supported on the motor housing 105 via a bearing 121, and the other end side (power transmission mechanism 117 side) is rotatably supported via a bearing 123. The rotating shaft 131, the armature 133, and the commutator 137 constitute a rotor. The drive motor 111 is energized and driven through the controller 171 by a pulling operation of a trigger 109 a disposed on the hand grip 109.

  A housing cover 147 is detachably attached to a lower end portion of the motor housing 105, that is, an end portion extending from a connecting portion with the gear housing 107. The housing cover 147 has a cooling ventilation window (not shown for convenience). Although not shown for convenience, a cooling fan that rotates integrally with the rotating shaft 131 is provided on the other end side of the rotating shaft 131, and the housing cover is covered by the rotating cooling fan when the drive motor 111 is energized. The outside air is introduced into the motor housing 105 from the ventilation window 147 and is discharged radially, thereby cooling the commutator 137, the brush holder unit 161, the armature 133, and their peripheral portions. .

  The rotational output of the drive motor 111 is appropriately converted into a linear motion by the motion conversion mechanism 113 and then transmitted to the striking element 115, and the major axis direction of the hammer bit 119 (the left-right direction in FIG. 1) via the striking element 115. Generates an impact force on. The rotation output of the drive motor 111 is appropriately decelerated by the power transmission mechanism 117 and then transmitted to the hammer bit 119, and the hammer bit 119 is rotated in the circumferential direction. The motion conversion mechanism 113 and the striking element 115 correspond to the “drive mechanism” in the present invention.

  The motion conversion mechanism 113 is mainly composed of a crank mechanism. The crank mechanism is configured so that a piston 129 serving as a driving element constituting the final movable member of the crank mechanism linearly moves in the long axis direction of the hammer bit by being rotationally driven by the drive motor 111. On the other hand, the power transmission mechanism 117 is mainly configured by a gear reduction mechanism including a plurality of gears, and transmits the rotational force of the drive motor 111 to the tool holder. As a result, the tool holder is rotated in the vertical plane, and the hammer bit 119 held by the tool holder is rotated accordingly.

  The striking element 115 includes a striker 143 as a striking element slidably disposed on a bore inner wall of a cylinder (not shown for convenience) together with a piston 129, and an impact as an intermediate element slidably disposed in a tool holder. The main component is a bolt 145. The striker 143 is driven via an air spring in a cylinder air chamber as the piston 129 slides, collides with (impacts) the impact bolt 145, and transmits the impact force to the hammer bit 119 via the impact bolt 145. To do.

In the hammer drill 101 configured as described above, when the drive motor 111 is energized and driven, the hammer bit 119 is moved from the motion conversion mechanism 113 configured by the crank mechanism to the major axis direction via the striking element 115. A striking force is applied, and a rotational force in the circumferential direction is applied via a power transmission mechanism 117 constituted by a gear reduction mechanism. As a result, the hammer bit 119 performs a hammer operation in the major axis direction and a drill operation in the circumferential direction, and performs a chipping operation and a drilling operation on the workpiece (concrete).
The hammer drill 101 applies so-called hammering work in which only the striking force in the long axis direction is applied to the hammer bit 119 to perform work on the workpiece, and the striking force in the long axis direction and the rotational force in the circumferential direction. In addition, the so-called hammer drilling operation is carried out by appropriately switching the processing work of the workpiece, but this is not directly related to the present invention, so the description thereof will be given. Omitted.

  The hammer drill 101 according to the present embodiment illuminates the machining work site of the workpiece to be machined by the hammer bit 119 so that the machining work can be performed in a bright environment at night or in a dark place. The lighting fixture 151 is provided. The lighting tool 151 corresponds to the “lighting device” in the present invention. As shown in FIGS. 2 to 4, the lighting device 151 includes a light case 153 and a single or a plurality of LED (light emitting diode) lights as light sources accommodated in the light case 153 (illustration is omitted for convenience). The LED lead 155 for supplying current to the LED light is mainly configured. The light case 153 and the LED light correspond to the “light emitting portion” in the present invention, and the LED lead wire 155 corresponds to the “electric wire” in the present invention. The light case 153 has a lens member made of a translucent material at least in a front region where the light of the LED light is irradiated, and the light of the LED light is irradiated through the lens member. The

  The illuminator 151 is mounted on the motor housing 105, and is set so as to irradiate the area around the tip of the hammer bit 119 including the tip (front end) of the hammer bit 119, that is, the cutting work site of the workpiece, with LED light. Is done. In the present embodiment, the illuminating device 151 is arranged in a front region on the lower end side which is an end portion in the extending direction of the motor housing 105 and is fixed by the brush holder unit 161. The front area on the lower end side corresponds to the “lower end area facing the articulated area” in the present invention.

  Hereinafter, the fixing structure of the illumination tool 151 by the brush holder unit 161 will be described. On the lower end portion side of the motor housing 105, a unit housing portion 127 for placing the brush holder unit 161 and a light housing portion 125 for placing the lighting device 151 are formed. A bearing housing portion 105a for housing the bearing 121 is provided in a projecting shape downwardly at a substantially central portion of the lower end portion that is the extending side end portion of the motor housing 105, and the bearing housing portion 105a is disposed at a predetermined interval. A substantially cylindrical upright wall 105b is formed at a predetermined height so as to surround and the bearing housing portion 105a and the upright wall 105b are integrally connected by a radial wall. A substantially ring-shaped space region surrounded by the bearing housing portion 105a, the standing wall 105b, and the radial wall is a unit housing portion 127.

  On the other hand, the light accommodating portion 125 is formed by providing a recess with a predetermined depth facing obliquely upward corresponding to the outline shape of the light case 153 in the front portion in the circumferential direction of the standing wall 105b. In addition, the light accommodating part 125 has the irradiation hole 125a opened toward the front outer side. The illuminator 151 is disposed so as to be fitted into the light accommodating portion 125 from below the motor housing 105. At this time, as shown in FIG. 3, the LED lead wire 155 of the illuminator 151 is wired over a substantially half-circumferential region along the inner wall surface of the standing wall 105b of the motor housing 105, and a notch 105c formed in the standing wall 105b. Through the motor housing 105. The lead end of the LED lead wire 155, that is, the terminal 155a is connected to the controller 171.

  The brush holder unit 161 includes a base part 163 having a substantially rectangular through-hole through which the commutator 137 and the bearing accommodating part 105a can penetrate in the center part, a brush accommodating part 165 that accommodates and holds a carbon brush (not shown for convenience), The connection terminal 167 for the stator 135 and the connection portion 169 for the controller 171 are mainly configured. The base portion 163 includes a cylindrical portion 163a having a through hole and a substantially circular disc portion 163b formed on one end side in the axial direction of the cylindrical portion 163a, and is formed by a resin molded product having elasticity. ing. The carbon brush accommodated in the brush accommodating portion 165 is brought into contact with the commutator 137 of the drive motor 111 through an opening formed in the cylindrical portion 163a, and supplies a current. The controller 171 controls the driving / stopping of the driving motor 111 and the on / off of the lighting device 151.

The brush holder unit 161 formed as described above is assembled to the unit housing portion 127 of the motor housing 105 from the lower side of the motor housing 105 (opposite to the extending direction). This state is shown in FIG. The brush holder unit 161 is disposed so that the commutator 137 and the bearing housing portion 105a have through holes fitted in a loose fit, and the disc portion 163b covers the inner peripheral region of the standing wall 105b of the motor housing 105. By arranging in this way, the disc portion 163b of the base portion 163 covers (covers) the LED lead 155 arranged along the inner surface of the standing wall 105b from below, and the front portion of the disc portion 163b It abuts against the light case 155 of the illuminator 151 so as to overlap from below. As a result, the LED lead wire 155 is sandwiched between the motor housing 105 and the disk portion 163b of the brush holder unit 161, and this sandwiching configuration corresponds to the “configuration of the electric wire accommodation path” in the present invention.
The brush holder unit 161 arranged as described above is fixed to the motor housing 105 by set screws 162 at a plurality of locations. By tightening the set screw 162, the contact portion of the disc portion 163b with the light case 153 is elastically deformed, and the light case 153 is pressed against the wall surface of the light accommodating portion 125 in a resilient manner. Thus, the contact part of the disk part 163b with respect to the light case 153 functions as a pressing part that presses the lighting tool 151 in a bullet shape. Note that the brush holder unit 161 and the illumination tool 151 assembled to the lower end portion of the motor housing 105 are covered with a housing cover 147 attached to the lower end of the motor housing 105. This state is shown in FIGS.

  The hammer drill 101 according to the present embodiment is configured as described above. That is, in the hammer drill 101 having a configuration in which the drive motor 111 is arranged so that the rotation axis of the drive motor 111 intersects the long axis direction of the hammer bit 119, the lighting tool 151 is provided in the front region at the lower end of the motor housing 105. The machining work site including the tip of the hammer bit 119 is irradiated. As a result, the worker can easily perform the processing work by the hammer bit 119 at night or in a dark place. In this case, since the illuminating device 151 is disposed in the motor housing 105 at a front position away from the hand grip 109 gripped by the worker, the light of the LED light is not blocked by the finger of the worker. The work site can be reliably illuminated.

  In particular, according to the present embodiment, the brush holder unit 161 is disposed on the lower end side of the motor housing 105, and the lighting tool 151 is lighted by using the elastic deflection of the disk portion 163 b of the base portion 163 in the brush holder unit 161. It is configured to be fixed by pressing in a resilient manner on the wall surface of the accommodating portion 125, thereby restricting the movement of the lighting device 151. For this reason, rattling of the illuminator 151 due to vibration during processing operations is suppressed, and light shake is prevented, and wear due to rubbing due to rattling can be reduced. Further, since the brush holder unit 161 is used as a pressing tool for the lighting tool 151, it is not necessary to set a dedicated pressing tool separately. For this reason, the number of parts is reduced, which is effective in simplifying the structure or reducing the cost.

  In the present embodiment, the LED lead 155 of the illuminator 151 is sandwiched between the motor housing 105 and the brush holder unit 161, that is, the LED lead 155 is accommodated by the motor housing 105 and the brush holder unit 161. The accommodation route is configured. For this reason, during energization driving of the drive motor 111, dust sucked into the housing together with outside air through the ventilation window of the housing cover 147 of the motor housing 105 is prevented from directly interfering with the LED lead wire 155. Thereby, damage to the LED lead wire 155 can be prevented and durability can be improved. Further, the LED lead 155 is not exposed when the carbon brush is replaced. For this reason, workability can be improved without interfering with the brush replacement work.

  In the present embodiment, an electric hammer drill has been described as an example of an impact tool. However, the present invention is not limited to an electric hammer drill, and the drive motor 111 is arranged so as to intersect the major axis direction of the hammer bit 119. If present, the present invention may be applied to a hammer that performs a chiseling operation or the like on a workpiece by causing the hammer bit to perform only a striking operation in the long axis direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view partially including a cross section showing an overall configuration of an electric hammer drill according to an embodiment of the present invention. It is the A section enlarged view of FIG. It is the figure which looked at the motor housing from the lower part, and shows the brush holder unit before attachment. It is the figure which looked at the motor housing from the lower part, and shows the brush holder unit after attachment.

101 Hammer drill (blow tool)
103 Main body (tool body)
105 Motor housing (first housing)
105a Bearing housing portion 105b Standing wall 105c Notch 107 Gear housing (second housing)
109 Hand grip (grip part)
109a Trigger 111 Drive motor (motor)
113 Motion conversion mechanism 115 Impact element 117 Power transmission mechanism 119 Hammer bit (tool bit)
121 bearing 123 bearing 125 light accommodating portion 125a irradiation hole 127 unit accommodating portion 129 piston 131 rotating shaft 133 armature 135 stator 137 commutator 143 striker 145 impact bolt 147 housing cover 151 illuminating device (illuminating device)
153 Light case (light emitting part)
155 LED lead wire (electric wire)
155a terminal 161 brush holder unit 162 set screw 163 base part 163a cylindrical part 163b disk part 165 brush storage part 167 connection terminal 169 connection part 171 controller

Claims (3)

“It is a striking tool that performs a predetermined processing operation on a workpiece by a striking motion of the tool bit in the long axis direction,
A tool body having a first housing and a second housing;
A grip part gripped by an operator connected to the tool body;
A motor,
A drive mechanism for linearly driving the tool bit by converting the rotational output of the motor into a linear motion and operating linearly in a direction intersecting the rotational axis of the motor;
The first housing accommodates a motor and extends in the rotation axis direction of the motor,
The second housing accommodates the drive mechanism, extends in the longitudinal direction of the tool bit, and can be attached to the tool bit in a tip region.
The first housing and the second housing are connected to each other so as to intersect with each other, thereby forming the tool body,
A lighting device;
The lighting device includes a light emitting unit that illuminates a tip peripheral region of the tool bit including a tip of the tool bit, and an electric wire that supplies current to the light emitting unit.
The light emitting portion is disposed in a concave accommodating portion formed at an end portion of the first housing, and is a brush holder unit that is assembled to the first housing from a direction intersecting with a long axis direction of the tool bit. A hitting tool that is pressed against and fixed to the wall surface of the housing portion . The impact tool according to claim 1 ,
Before Symbol brush holder unit has at least elastically deformable base portion, in the state of being assembled to the first housing, the hold-down the light emitting portion to the elastic-like from the assembling direction by the base portion, thereby A striking tool characterized by restricting the movement of the light emitting portion. The impact tool according to claim 2,
An impact tool for accommodating the electric wire is constituted by the first housing and the brush holder unit assembled to the first housing.

Images