JP5294726B2 - Hand-held work tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology contributing to compacting of a vibration-proof handle in a hand-held working tool. <P>SOLUTION: The hand-held working tool has a working tool body 103 in which an end tool 119 can be attached to the end area, and a handle 109 disposed on the rear side of the opposite side to the end tool 119 in the working tool body 103 and gripped by a worker. The handle 109 is connected to the working tool body 103 through elastic bodies 181, 183, and is set relatively slidable with respect to the working tool body 103 in the longitudinal direction of the end tool 119. An extending region 105b receiving the sliding movement of the handle 109 by extending itself toward the lower region of the handle 109 is formed on the working tool body 103. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an anti-vibration handle for a hand-held work tool that drives a tip tool at a constant cycle, such as a hammer or a hammer drill.

  Japanese Patent Laying-Open No. 2005-219195 (Patent Document 1) discloses a configuration of a hand-held electric hammer having a vibration-proof handle. In this electric hammer, a configuration is disclosed in which a vibration isolating handle gripped by an operator at the time of hammering is attached to the hammer main body via a vibration absorbing elastic body. More specifically, the anti-vibration handle is relative to the rear part of the hammer body in the major axis direction (front-rear direction) of the hammer bit with the pivot shaft as a fulcrum on one end (lower end) side of the grip part. It is attached so as to be rotatable, and is connected to the other end (upper end) via an elastic body.

In the case of the above-described rotational vibration-proof handle supported so as to be relatively pivotable via the pivot shaft, the elastic body is deformed in an arc shape with the pivot shaft as the center. Therefore, if the deformation direction of the elastic body is made closer to the long axis direction of the hammer bit to obtain the desired vibration isolation effect, the arrangement interval between the rotating shaft and the elastic body will be widened. The size will increase in the vertical direction. For this reason, the swing type vibration isolating handle is difficult to apply to a relatively small work tool, and there is still room for improvement in this respect.
JP 2005-219195 A

  This invention is made | formed in view of this point, and it aims at providing the technique which contributes to size reduction of a vibration-proof handle in a hand-held work tool.

  In order to achieve the above object, a preferred embodiment of a hand-held work tool according to the present invention is a hand-held work tool that drives a tip tool linearly in the long axis direction, thereby causing the tip tool to perform a predetermined machining operation. The work tool main body in which the front tool can be attached to the front end region, and a handle gripped by the operator disposed on the rear end side opposite to the front tool in the work tool main body. The “hand-held work tool” in the present invention typically corresponds to a hammer that performs a hammering operation on a workpiece by striking a tip tool in the long axis direction, but is not limited to a hammer. Cutting tools such as reciprocating saws and jigsaws that cut workpieces by reciprocating linear movement of the blades, in addition to hammer drills that perform hammer drilling operations on workpieces by striking and rotating the tip tool. Etc. are widely included.

  According to the preferable form of the hand-held work tool according to the present invention, the handle is connected to the work tool main body via an elastic body and slides relative to the work tool main body in the longitudinal direction of the tip tool. It is supposed to be free. The work tool main body has an extended region that extends to a lower region of the handle and receives a sliding motion of the handle. The “elastic body” in the present invention typically corresponds to a spring or rubber. In addition, as an aspect in which the extension region receives the sliding movement of the handle, for example, an aspect in which the planes are relatively slid in a state where the planes are in contact with each other, a groove in the long axis direction of the tip tool, and a protrusion engaged with the groove And a slide structure including a hole in the long axis direction of the tip tool and a rod-like member fitted to the hole.

  In the present invention, the handle is elastically connected to the working tool main body so as to be slidable relative to the long axis direction of the tip tool. Therefore, since the elastic body can linearly deform in the major axis direction of the tip tool and absorb the vibration, the vibration absorption efficiency by the elastic body can be improved. Further, since the handle is linearly moved relative to the work tool main body, unlike the conventional rotary handle, the vertical length is not restricted and the size can be reduced. In the present invention, the work tool main body is provided with an extension region extending to the lower region of the handle, and the handle is slid by the extension region. Thereby, the form which supports a handle stably can be constructed.

Further, according to the present invention, the handle has a grip portion extending in the vertical direction intersecting the long axis direction of the tip tool, and the same direction as the long axis direction of the tip tool from each of the extending direction end portions of the grip portion. Are formed in a closed-loop frame structure by one upper and lower arm portions extending in parallel to each other and an intersecting portion joining the extended end portions of the upper and lower arm portions to each other. According to the present invention, by adopting such a closed loop frame structure, it is possible to increase the rigidity of the handle, which is effective in preventing damage during dropping.
Further, according to the present invention, the upper surface of the extension region of the work tool main body has an opening, and the opening extends in the long axis direction of the tip tool and extends downward in the long axis direction. In this configuration, the arm part is slidably abutted relative to the arm part, and the lower arm part can be moved in the major axis direction.

  According to the further form of the hand-held work tool according to the present invention, a slide surface that slides slidably with respect to the work tool body is set in a side surface region of the handle that is parallel to the longitudinal direction of the tip tool. Has been. In the present invention, the “side surface region of the handle” corresponds to the side surface region of the arm portion or the side surface region of the intersecting portion. According to the present invention, by providing the side surface region of the handle with the slide surface that slides with the work tool main body, it is possible to reduce rattling in the direction intersecting the slide surface, that is, in the left-right direction. Thereby, the relative movement of the handle with respect to the work tool main body is stabilized, and a sufficient vibration-proofing effect can be obtained even if the spring constant of the elastic body is lowered.

  According to the further form of the hand-held work tool which concerns on this invention, a slide surface is the up-down direction which cross | intersects the 1st slide area | region extended in the major axis direction of a front-end | tip tool, and the extension direction of the said 1st slide area | region. A second slide region extending to the surface. Note that the first slide region is set on the side surface of the arm portion, and the second slide region is set on the side surface of the intersecting portion. According to the present invention, it is possible to form a wide slide surface by providing the handle with the first slide region in the major axis direction of the tip tool and the second slide region in the vertical direction intersecting the major axis direction of the tip tool. Thus, the shakiness of the handle with respect to the work tool body can be further reduced.

  According to the further form of the hand-held work tool which concerns on this invention, it has an electric motor which drives a tip tool, and a battery pack used as a power supply of the said electric motor. And the extension area | region extended to the downward area | region of a handle | steering-wheel comprises the battery pack attaching part to which a battery pack is attached detachably. Thus, according to the present invention, in the rechargeable hand-held work tool that uses the battery pack as a power source for the electric motor, the extension area from the work tool main body is used as the sliding guide area of the handle and the mounting base of the battery. It can be used together and is reasonable.

  According to the further form of the hand-held work tool according to the present invention, the work tool main body and the handle allow the relative sliding movement in the major axis direction of the tip tool at the upper end and the lower end of the handle, and It is connected via a guide part that restricts relative movement in a direction other than the major axis direction. According to the present invention, it is possible to suppress backlash in the vertical direction as well as in the left-right direction of the handle and further reduce backlash.

  According to the further form of the hand-held work tool which concerns on this invention, a guide part is comprised by the recessed part extended in the major axis direction of a front-end tool, and the protrusion part engaged with the said recessed groove so that relative movement is possible. In addition, the protrusion is formed of a metal pin, and the groove is formed of a material different from that of the metal pin. As a matter of course, one of the concave groove and the protrusion is set on the work tool main body side, and the other is set on the handle side. Further, at least the material on the side where the groove is set is preferably made of synthetic resin or aluminum alloy from the viewpoint of weight reduction. According to the present invention, the slidability can be improved by relating the protrusions and the groove portions that relatively slide to each other by using different materials.

  According to the present invention, in a hand-held work tool, a technique that contributes to a compact vibration-proof handle is provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The embodiment of the present invention will be described using a rechargeable hammer drill as an example of a hand-held work tool. FIG. 1 is an external view showing the overall configuration of a hammer drill 101 according to the present embodiment, and FIG. 2 is a side view showing the internal structure of the hammer drill 101 by broken lines and a partial cross section. As shown in FIG. 1, the hammer drill 101 generally includes a main body 103 that forms an outline of the hammer drill 101, and a hammer bit that is detachably attached to a tip region of the main body 103 via a tool holder 137. 119, a hand grip 109 gripped by a user connected to the opposite side of the hammer bit 119 of the main body 103 and a battery pack 107 mounted on the lower side of the main body 103 are mainly configured. The main body 103 corresponds to the “work tool main body” in the present invention, the hammer bit 119 corresponds to the “tip tool” in the present invention, and the hand grip 109 corresponds to the “handle” in the present invention. The hammer bit 119 is held by the tool holder 137 so that the hammer bit 119 can be reciprocated relatively in the major axis direction, and the relative rotation in the circumferential direction is restricted. For convenience of explanation, the hammer bit 119 side is referred to as the front, and the hand grip 109 side is referred to as the rear.

  As shown in FIG. 2, the main body 103 is mainly configured by a housing 105 that houses an electric motor 111, a motion conversion mechanism 113, a striking element 115, and a power transmission mechanism 117. The rotational output of the electric 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 hammer bit 119 is driven through the striking element 115 in the major axis direction (left-right direction in FIG. 2). Generates an impact force on. The rotational output of the electric 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 electric motor 111 is energized and driven by pulling a trigger 109a disposed on the handgrip 109, thereby causing the electric switch 109b to be turned on.

  The electric motor 111 is disposed in a lower region in the housing 105 such that the rotation axis thereof intersects with the long axis direction of the hammer bit 119 and extends in an inclined manner in the vertical direction. The motion conversion mechanism 113 includes a drive gear 121 that is rotationally driven by the electric motor 111, a driven gear 123 that meshes and engages with the drive gear 121 and is rotationally driven in a vertical plane, and the intermediate shaft 125 together with the driven gear 123. The rotating body 127 rotating through the rotating body 127, the swinging ring 129 as a swinging member swinging in the longitudinal direction of the hammer bit 119 by the rotation of the rotating body 127, and the reciprocating movement linearly by the swinging of the swinging ring 129. The main component is a cylindrical piston 141 as a driving element. The oscillating mechanism is configured by the rotator 127 and the oscillating ring 129 supported by the rotator 127 via a bearing so as to be relatively rotatable.

  The cylindrical piston 141 is formed in a cylindrical shape with one end (rear end) closed. The cylindrical piston 141 is slidably disposed in a cylindrical tool holder 137 disposed coaxially with the cylindrical piston 141, and the swinging motion of the swinging ring 129 (the long axis of the hammer bit 119). Driven by the directional component) and performs a linear motion along the tool holder 137.

  The striking element 115 is slidably disposed on the striker 143 as a striking element slidably disposed in the cylindrical hole of the cylindrical piston 141 and the tool holder 137, and the operation energy of the striker 143 is transferred to the hammer bit 119. The main body is an impact bolt 145 as a meson that transmits to the main body. The striker 143 is driven (fired) through pressure fluctuation (air spring) in the air chamber of the cylindrical piston 141 accompanying the sliding movement of the cylindrical piston 141, and is slidably disposed in the tool holder 137. The impact bolt 145 collides (hits) and the impact force is transmitted to the hammer bit 119 via the impact bolt 145. A bit striking mechanism is constituted by the cylindrical piston 141, the striker 143, and the impact bolt 145.

  The power transmission mechanism 117 is engaged with and engaged with the first transmission gear 131 that is rotationally driven in the vertical plane from the electric motor 111 via the intermediate shaft 125, and the outside of the tool holder 137. The second transmission gear 133 is coaxially arranged on the main body. The rotational driving force of the second transmission gear 133 is transmitted to the tool holder 137 and further transmitted to the hammer bit 119 held by the tool holder 137.

In the hammer drill 101 configured as described above, when the electric motor 111 is energized and driven, the hammer bit 119 receives a striking force in the major axis direction from the motion conversion mechanism 113 via the striking element 115. The rotational force in the circumferential direction is applied via the power transmission mechanism 117. Thus, the hammer bit 119 performs a hammering operation in the major axis direction and a drilling operation in the circumferential direction to perform a drilling operation on the workpiece (concrete).
The hammer drill 101 applies a hammering operation for processing a workpiece by applying only a striking force in the major axis direction to the hammer bit 119, and a striking force in the major axis direction and a rotational force in the circumferential direction. In addition, it is configured so that it can be switched between a hammer drill operation for performing a work operation of the workpiece as appropriate, but since this is not directly related to the present invention, the description thereof is omitted.

  Next, the vibration isolating structure of the handgrip 109 will be described mainly with reference to FIGS. 3 and 4 are views showing the vibration isolating structure of the hand grip 109, FIG. 5 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 6 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 5 and 6, the hollow housing 105 constituting the main body 103 is constituted by left and right half housing constituent members 105 </ b> L and 105 </ b> R vertically divided in the major axis direction of the hammer bit 119. . 3 and 4 show a state in which the left half housing component 105L is removed when the hammer drill 101 is viewed from the front. In one of the left and right half housing components 105L and 105R, for example, the left half housing component 105L, as shown in FIG. 5, a direction perpendicular to the mating surface in the peripheral region on the mating surface side (inner surface side) A plurality of cylindrical dowels 151 projecting in the same manner are provided, and the right half-housing housing member 105R is provided with a plurality of dowel holes 153 corresponding to the dowels 151. Then, the left and right half housing constituent members 105 </ b> R and 105 </ b> L are joined to each other by a screw 155 with the dowel 151 inserted in the dowel hole 153.

  As shown in FIGS. 3 and 4, the hand grip 109 includes a grip portion 161 extending in the vertical direction (vertical direction) intersecting the major axis direction of the hammer bit 119, and an end portion in the extending direction of the grip portion 161. The upper and lower arm portions 162 and 163 extending in the left-right direction (horizontal direction) intersecting with the extending direction and the grip portion 161 extend substantially in parallel, and the extended end portions of the upper and lower arm portions 162 and 163 Are formed as a closed-loop integrated frame structure by stays 164 connecting the two. Thereby, the rigidity of the hand grip 109 is enhanced. Therefore, it is effective in preventing damage to the hand grip 109 when the hammer drill 101 falls. The stay 164 corresponds to the “intersection” in the present invention.

  Further, as shown in FIGS. 5 and 6, the hand grip 109 is composed of left and right half-handed grip components 109 </ b> L and 109 </ b> R vertically divided in the longitudinal direction of the hammer bit 119, as in the case of the housing 105. ing. One of the left and right half-handgrip components 109L, 109R, for example, the left half-handgrip component 109L, has a cylindrical dowel 167 perpendicular to the mating surface in the peripheral area on the mating surface side (inner surface side). A plurality of dowel holes 168 corresponding to the dowels 167 are provided in the right half-handed handgrip component 109R correspondingly. Then, with the dowel 167 fitted into the dowel hole 168, the left and right half hand grip constituting members 109L and 109R are joined to each other by a screw 169.

  As shown in FIG. 1, the rear region of the housing 105 includes an upper extension portion 105 a extending toward the upper arm portion 162 of the handgrip 109 and a lower extension portion extending toward the lower arm portion 163. 105b and an intermediate portion 105c located in the middle thereof are formed in a substantially U shape in a side view. Openings are formed in the lower surface and the rear end surface of the upper extension portion 105a, the upper surface of the lower extension portion 105b, and the rear surface of the intermediate portion 105c, and the upper and lower arm portions 162, 163 of the handgrip 109 are formed through the openings. The stay 164 is inserted into the hollows of the upper extension part 105a, the lower extension part 105b, and the intermediate part 105c, and is movable in the major axis direction of the hammer bit 119. The downward extending portion 105b corresponds to the “extending region” in the present invention. The battery pack 107 is detachably mounted on the lower surface side of the downwardly extending portion 105b of the housing 105. That is, the downward extending portion 105 b is configured to also serve as a mounting base for the battery pack 107.

  Thus, the handgrip 109 is arranged in the major axis direction (front-rear direction) of the hammer bit 119 in a state where parts other than the grip part 161 are sandwiched (wrapped) from the left and right outer sides by the substantially U-shaped rear region of the housing 105. While being supported so as to be relatively movable, the front end side thereof is connected to the housing 105 via upper and lower coil springs 181 and 183. 3 and 4, the upper coil spring 181 is elastically interposed between the front end surface of the upper arm portion 152 and the rear wall surface of the inner housing 185 disposed in the housing 105, and The lower coil spring 183 is elastically interposed between the lower front surface of the stay 164 and the rear wall surface of the inner housing 185.

  On the left and right side surfaces of the upper and lower arm portions 162 and 163 and the left and right side surfaces of the stay 164 in the hand grip 109, smooth surfaces 162a, 163a, and 164a parallel to the major axis direction of the hammer bit 119 are partially or entirely disposed. Is formed. The smooth surfaces 162a, 163a of the upper and lower arm portions 162, 163 extend in the major axis direction (front-rear direction) of the hammer bit 119, and the smooth surface 164a of the stay 164 intersects with the major axis direction of the hammer bit 119. Extended in the direction. And the opening edge (wall surface) 165 of the opening formed in the upward extension part 105a of the housing 105, the downward extension part 105b, and the intermediate part 105c with respect to these smooth surfaces 162a, 163a, 164a (refer FIG. 5). Are in contact with each other relatively slidably.

  That is, the opening edge 165 constitutes a sliding guide surface that is in sliding contact with the smooth surfaces 162a, 163a, and 164a by surface contact. The abutting structure between the smooth surfaces 163a and 164a of the lower arm portion 163 and the stay 164 and the opening edges of the downward extending portion 105b and the intermediate portion 105c is omitted for convenience, but FIG. It is comprised similarly to the contact structure of the smooth surface 162a of the upper arm part 162 shown to the opening edge 165 of the upward extension part 105a. As a result, the handgrip 109 is prevented from rattling in the horizontal direction (left-right direction) intersecting the long axis direction of the hammer bit 119 with respect to the housing 105, and as a result, relative to the long axis direction of the hammer bit 119. The sliding operation is stabilized. The smooth surfaces 162a, 163a, 164a correspond to the “slide surface” in the present invention, and the smooth surfaces 162a, 163a of the upper extension portion 105a and the lower extension portion 105b correspond to the “first slide region” in the present invention. The smooth surface 164a of the stay 164 corresponds to the “second slide region” in the present invention.

  Further, slide guide portions are provided between the arm portion 162 on the hand grip 109 and the upper extension portion 105a of the housing 105, between the lower arm portion 163 and the lower extension portion 105b, and between the stay 164 and the intermediate portion 105c, respectively. 171, 173, and 175 are set. The upper and lower slide guide portions 171 and 173 correspond to “guide portions” in the present invention. As shown in FIGS. 3 to 5, the upper slide guide portion 171 is formed on the elongated hole 171 a formed in the approximate center in the extending direction of the upper arm portion 162 and on the upper extending portion 105 a side. The projection 171b is slidably inserted into the long hole 171a. The projecting portion 171b is configured to be used as the cylindrical dowel 151 formed on the left half housing component member 105L. In the present embodiment, the two dowels 151 are also used as the projecting portion 171b. The hammer bits 119 are arranged side by side in the longitudinal direction. The long hole 171a penetrates in the left-right direction (see FIG. 5) and extends a predetermined length in the major axis direction of the hammer bit 119 (see FIGS. 3 and 4).

  On the other hand, as shown in FIGS. 3, 4 and 6, the lower slide guide portion 173 is a protrusion 2 attached to the rear end side of the lower arm portion 162 (the connecting portion with the grip portion 161). The metal pin 173b is formed on the upper inner surface of the rear end side of the downwardly extending portion 105b (the inner surfaces of the left and right half housing constituent members 105L and 105R), and the end of the metal pin 173b is slidably inserted. And a concave groove 173a (indicated by a two-dot chain line in FIGS. 3 and 4). The two metal pins 173b penetrate the lower arm portion 163 in the left-right direction, and are juxtaposed at predetermined intervals in the major axis direction (front-rear) of the hammer bit 119. Is inserted into the concave groove 173a. The concave groove 173a extends in the major axis direction of the hammer bit 119 by a predetermined length. Note that the half housing constituent members 105L and 105R in which the concave grooves 173a are formed are made of a material different from the metal pins 173b, for example, a lightweight material such as synthetic resin or aluminum. For this reason, slidability can be improved by setting it as the sliding structure by heterogeneous materials.

  Further, as shown in FIGS. 3 and 4, the intermediate slide guide portion 175 is formed on a side surface on the lower front side of the stay 164, and is a concave groove 175 a that extends a predetermined length in the major axis direction of the hammer bit 119. And a circular protrusion 175b (see a two-dot chain line in the drawing) that protrudes inwardly on the inner surface of the intermediate portion 105c of the housing 105 and is slidably fitted in the concave groove 175a.

  As described above, the handgrip 109 is moved relative to the housing 105 in the vertical direction intersecting the longitudinal direction of the hammer bit 119 by the slide guide portions 171, 173, and 175 set at three positions, the upper and lower sides and the middle. In addition to being regulated, the vertical shaking is suppressed.

  The hammer drill 101 according to the present embodiment is configured as described above. FIG. 3 shows an initial state (a state in which the hand grip 109 is attached to the housing 105). In this state, the hand grip 109 is urged rearward in a direction away from the housing 105 by the elastic force of the coil springs 181 and 183. In addition, at least the protrusion 171b of the upper slide guide portion 171 is in contact with the front end of the long hole 171a. FIG. 4 shows a state (maximum movement state) in which the hand grip 109 is most moved from the initial state to the housing 105 side (forward) and the protrusion 171b is in contact with the rear end of the long hole 171a. A maximum relative movement amount of the hand grip 109 is indicated by a symbol L.

  The processing operation by the hammer drill 101 is performed while the operator holds the grip portion 161 of the hand grip 109 and applies a forward pressing force to the hammer drill 101. That is, the protrusions 171b, the metal pins 173b, and the circular protrusions 175b of the upper and lower and middle slide guide portions 171, 173, and 175 are provided between the rear end and the front end of the long hole 171a and the concave grooves 173a and 175a, respectively. The machining operation is performed in the state where it is placed. In this state, the hand grip 109 is allowed to move relative to the housing 105 in the long axis direction (front-rear direction) of the hammer bit 119. For this reason, at the time of the machining operation, transmission of vibration generated in the housing 105 from the housing 105 to the hand grip 109 can be reduced by the coil springs 181 and 183.

  In the present embodiment, as described above, the hand grip 109 is elastically connected to the housing 105 via the upper and lower coil springs 181 and 183, and is attached so as to be relatively movable in the major axis direction of the hammer bit 119. Therefore, since the coil springs 181 and 183 absorb vibration by linear deformation in the long axis direction, the vibration absorption efficiency by the coil springs 181 and 183 can be improved.

  In the case of a conventional rotary handgrip in which one end side in the extending direction (vertical direction) of the grip portion is connected to the hammer body portion via a coil spring, and the other end side is rotatably supported with a rotation shaft as a fulcrum. If the deformation direction of the coil spring is brought close to the long axis direction of the hammer bit to obtain the desired vibration isolation effect, the arrangement interval between the rotating shaft and the coil spring increases, resulting in a large vertical dimension of the hand grip. turn into. However, as in the present embodiment, when the handgrip 109 is configured to vibrate by linearly moving in the long axis direction of the hammer bit 119, there is a restriction on the setting of the vertical length. Therefore, the hand grip 109 can be made compact.

  In addition, according to the present embodiment, the lower extension 105b can be stably slidably supported by the lower extension 105b provided in the housing 105, and the lower extension 105b of the battery pack 107 can be supported. Because of the configuration that also serves as the mounting base, a rational support form can be constructed.

  Further, according to the present embodiment, the upper and lower extending portions 105a and 105b extending rearward at the rear portion of the housing 105 and the intermediate portion 105c between the extending portions 105a and 105b are substantially reduced in side view. A shape area is set, and the upper and lower arm portions 162 and 163 and the stay 164 of the handgrip 109 are inserted (inserted) into the substantially U-shaped area. As a result, wide smooth surfaces 162a, 163a, 164a can be formed on the left and right side surfaces of the arm portions 162, 163 and the stay 164, and rattling of the handgrip 109 in the left-right direction can be suppressed. Further, the vertical shaking of the hand grip 109 can be suppressed by the upper and lower and middle slide guide portions 171, 173, and 175.

  As described above, according to the present embodiment, the handgrip 109 has a sufficient reduction in the spring constants of the coil springs 181 and 183 by suppressing the rattling of the hammer bit 119 in a direction other than the major axis direction. It is possible to provide a handgrip 109 having a vibration-proof structure that can provide a vibration-proof effect and has a good feeling of use.

The present embodiment has been described in the case of a hammer drill as an example of a hand-held work tool. However, the present embodiment may be applied to a hammer that causes the hammer bit 119 to perform only a striking operation in the long axis direction, or a blade. The present invention may be applied to a cutting work tool such as a reciprocating saw or a jigsaw that performs a reciprocating linear motion to cut a workpiece.
In the present embodiment, the rechargeable work tool including the battery pack 107 as a power source for the electric motor 111 has been described. However, the present invention may be applied to a work tool that drives the electric motor 111 with an AC power source.

It is an external view which shows the whole structure of the rechargeable hammer drill which concerns on embodiment of this invention. It is a side view which shows the internal structure of a rechargeable hammer drill with a broken line and a partial cross section. It is a figure which shows the vibration isolating structure of a hand grip, and has shown the initial state (attachment state) by which the hand grip was moved most back. It is a figure which shows the vibration isolating structure of a hand grip, and shows the maximum movement state by which the hand grip was moved to the foremost (housing side). FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3.

101 Hammer drill (hand-held work tool)
103 Main body (work tool main body)
105 Housing 105a Upper extension part 105b Lower extension part (extension area)
105c Intermediate part 105L Left half housing component 105R Right half housing component 107 Battery pack 109 Hand grip (handle)
109a Trigger 109b Electric switch 109L Left half-hand grip component 109R Right half-hand grip component 111 Electric motor 113 Motion conversion mechanism 115 Stroke element 117 Power transmission mechanism 119 Hammer bit (tip tool)
121 Drive gear 123 Driven gear 125 Intermediate shaft 127 Rotating body 129 Oscillating ring 131 First transmission gear 133 Second transmission gear 137 Tool holder 141 Cylindrical piston 143 Impact bolt 151 Dowel 153 Dowel hole 155 Screw 161 Grip portion 162 Above Arm portion 162a Smooth surface 163 Lower arm portion 163a Smooth surface 164 Stay (intersection)
164a Smooth surface (slide surface)
165 Opening edge 167 Dowel 168 Dowel hole 169 Screw 171 Upper slide guide portion (guide portion)
171a Long hole 171b Projection 173 Lower slide guide part (guide part)
173a Concave groove 173b Metal pin 175 Intermediate slide guide portion 175a Concave groove 175b Coil spring (elastic body) on circular protrusion 181
183 Lower coil spring (elastic body)
185 inner housing

Claims (6)

It is a hand-held work tool that drives the tip tool linearly in the long axis direction, thereby causing the tip tool to perform a predetermined machining operation,
A work tool body in which the tip tool can be attached to the tip region;
A handle gripped by an operator disposed on the rear side opposite to the tip tool in the work tool body,
The handle is connected to the work tool main body via an elastic body, and is relatively slidable in the major axis direction of the tip tool with respect to the work tool main body.
The work tool body has an extended region that extends to a lower region of the handle and receives a sliding motion of the handle,
The handle includes a grip portion extending in a vertical direction intersecting a major axis direction of the tip tool, and a vertical portion extending in the same direction as the major axis direction of the tip tool from each of the extension direction end portions of the grip portion. Each one arm part and a crossing part joining the extended end parts of the upper and lower arm parts to each other are formed into a closed loop frame structure,
The upper surface of the extension region of the work tool body has an opening, and the opening extends in the long axis direction of the tip tool and is relative to the lower arm portion extending in the long axis direction. A hand-held work tool characterized by having a configuration in which the lower arm portion is slidably abutted and the lower arm portion can be moved in the major axis direction . The hand-held work tool according to claim 1,
A hand-held work tool characterized in that a slide surface that slides slidably with respect to the work tool main body is set in a side surface region of the handle that is parallel to a major axis direction of the tip tool. The hand-held work tool according to claim 2,
The slide surface includes a first slide area extending in a major axis direction of the tip tool and a second slide area extending in a vertical direction intersecting with an extension direction of the first slide area. A hand-held work tool. The hand-held work tool according to any one of claims 1 to 3,
An electric motor for driving the tip tool, and a battery pack used as a power source of the electric motor,
The extension region extending to a lower region of the handle constitutes a battery pack attachment portion to which the battery pack is detachably attached. The hand-held work tool according to any one of claims 1 to 4,
The work tool main body and the handle allow relative sliding movement in the major axis direction of the tip tool and restrict relative movement in directions other than the major axis direction at the upper end and lower end of the handle. A hand-held work tool characterized by being connected via a guide portion. The hand-held work tool according to claim 5,
The guide portion is constituted by a concave groove extending in the major axis direction of the tip tool and a protrusion that is movably engaged with the concave groove, and the protrusion is constituted by a metal pin. Features a hand-held work tool.

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