JP6502756B2 - Impact tool - Google Patents

Description

  The present invention relates to an impact tool that performs an impact operation on a workpiece.

  Japanese Patent Laid-Open No. 2006-175588 has a striking mechanism having a striking mechanism for moving a tip tool in the striking axis direction, a transmission housing for holding the striking mechanism, and a housing provided with a handle portion gripped by a user. A tool is disclosed. In the impact tool, the transmission housing and the housing are moved relative to each other in the striking axis direction by connecting the transmission housing and the housing by two elastic members, thereby suppressing the vibration associated with the driving of the striking mechanism.

JP, 2006-175588, A

  Since the vibration associated with the drive of the striking mechanism is largely generated along the striking axis, the above-described mechanism for moving the transmission housing and the housing relative to each other in the striking axis direction has a certain effect in vibration suppression. On the other hand, in the impact tool, since the vibration which can not be suppressed by the mechanism remains, further improvement has been desired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a more rational configuration for achieving vibration isolation in an actual batting operation.

In order to achieve the above-mentioned subject, according to a desirable mode of an impact tool concerning the present invention, a tip tool is driven linearly and it relates to an impact tool which performs an impact operation to a work material. A specific example of the striking tool is an electric hammer that moves a tip tool in a straight line and breaks a workpiece such as concrete.
The striking tool is driven by a drive motor having a main body portion, a tip tool mounting portion extended in a predetermined long axis direction, an output axis intersecting the long axis direction, and an output of the drive motor and is long axis direction And a handle portion held by the user, and a battery mounting portion for mounting a battery for supplying a current to the drive motor. The output axis is defined by the extension direction of the shaft of the drive motor. Specific examples of the striking element include a piston that is linearly reciprocated by a drive motor, a striker, and an air chamber formed between the piston and the striker. In this case, air in the air chamber is compressed when the piston moves toward the end tool. As the compressed air expands, the striker is moved and collides with the tip tool, whereby the tip tool is moved in the longitudinal direction. When the piston is moved to the side opposite to the tip tool, the air in the air chamber is expanded, and the contraction of the expanded air causes the striker to move to the side opposite to the tip tool. Therefore, the tip tool is moved linearly as the piston reciprocates. In the impact tool according to the present invention, a configuration in which an intermediate element is provided between the striker and the tip tool can be appropriately adopted. When the striking element has the above-described configuration, the direction in which the piston is reciprocated defines the striking axis. The striking axis is configured parallel to the long axis direction. In this case, it is sufficient for the striking shaft to pass any region on the piston. In addition, when the end tool is mounted on the end tool mounting portion, an impact axis passing through the center of the end tool is particularly referred to as a center impact axis.

Further, in the striking tool according to the aspect, the main body portion has a first main body element, a second main body element, and a biasing member that biases the first main body element and the second main body element.
The biasing member may be constituted by a spring element, for example a coil spring. When a coil spring is used as the biasing member, the coil spring includes the first body element and the second body element by fixing one end of the coil spring to the first body element and fixing the other end to the second body element. It becomes possible to energize the
Preferably, the biasing member biases the first body element and the second body element away from each other. This makes it possible to effectively prevent a collision between the first main body element and the second main body element when the first main body element and the second main body element move in the direction in which the first main body element and the second main body element approach each other. It is possible to suppress the occurrence of a scratch or the like of the main body.

Also, the body portion has a first area closer to the striking element and a second area farther from the striking element than the first area. The striking element and "adjacent" and "separating" are, for example, the respective linear distances when any two points on the main body in the longitudinal direction of the longitudinal direction are respectively connected with predetermined points in the striking element. It is possible to specify. That is, in the cross direction, an area having a point at which the distance to the predetermined point of the striking element is short is taken as a first area, and an area having a point at which the distance to the predetermined point of the striking element is long is taken as the second area. Can.
The first main body element is provided with a drive motor and a striking element, and the second main body element is provided with a handle portion and a battery mounting portion.

The striking tool according to the present embodiment further includes a vibration isolation mechanism that suppresses the vibration associated with the drive of the striking element. In the vibration isolation mechanism, the first body element and the second body element are separated and the first body element and the second body element are in proximity to each other via the biasing member due to the vibration associated with the driving of the striking element. Between the first and second body elements relative to each other.
A description will be given of the separated state and the close state of the first body element and the second body element. First, a predetermined point of the first body element and a predetermined point of the second body element in the long axis direction are defined. A distance connecting a predetermined point of the first main body element and a predetermined point of the second main body element is defined as a first position prescribed distance. Next, in a state in which the first body element and the second body element are moved relative to each other, the distance between the predetermined point of the first body element and the predetermined point of the second body element is a second position. It shall be the specified distance. Then, it is assumed that the first position prescribed distance is longer than the second position prescribed distance. In this case, the positional relationship between the first main body element and the second main body element forming the first prescribed distance is in a “separated state”. And the positional relationship of the 1st main body element and the 2nd main body element which form the 2nd prescribed distance turns into a "close state."

In the striking tool according to the present embodiment, the first region is longer than the second region in the distance in the major axis direction when the first body element and the second body element are moved from a separated state to a close state. Construct a long distance travel area that travels a long distance.
According to the striking tool of the present embodiment, with such a configuration, the first region strongly affected by the vibration from the striking element is moved by a relatively long distance compared to the second region. By setting the movement area, it is possible to achieve effective vibration isolation. In addition, the second region is relatively short with respect to the first region in the distance in the major axis direction when the first body element and the second body element are moved from being separated to being close to each other Can be said to constitute a short distance movement area to move. That is, by providing the anti-vibration mechanism with both the long distance movement region and the short distance movement region, it becomes possible to effectively suppress the vibration generated with the driving of the striking element.

Moreover, in the striking tool according to the present embodiment, the first body element has a first covered area covered by the second body element and an exposed area not covered by the second body element . That is, the first main body area and the second main body area have stacked areas which are areas overlapping with each other. In the laminated area, the coated side constitutes an exposed area, and the coated side constitutes a coated area. It should be noted that the exposed area can constitute the shell of the striking tool, and in this sense it is also possible not to cover other body elements.
In such a configuration, the drive motor is provided in the first covering area. That is, the drive motor is protected by the second body region inside the striking tool.

In addition, as another form of the striking tool according to the present invention, it has a gravity center position in a state where the battery is attached to the battery attachment portion, and the first main body element and the second main body element rotate relatively around the rotation axis. It can be configured to move.
In this configuration, the pivot axis can be provided closer to the center of gravity than the striking axis. The state in which the rotation axis is closer to the center of gravity than the striking axis means, for example, an imaginary line passing through the center of gravity and orthogonal to the striking axis, and a predetermined intersection of the imaginary line and the striking axis. When prescribed, it indicates that the distance from the pivot axis to the center of gravity is shorter than the distance from the pivot axis to the aforementioned intersection point. Such a configuration makes it possible to expand the moving distance between the first body element and the second body element in the long distance moving area (first area).
In addition, a part of the vibration associated with the driving of the striking element may change to the vibration in the rotational direction about the center of gravity of the striking tool. In such a case, according to the configuration, it is possible to effectively suppress the vibration in the turning direction of the striking tool.

Moreover, a drive motor can be arrange | positioned at a motor holding part as another form of the impact tool which concerns on this invention. In this case, the first body element can be integrated with the motor holder. When the first main body element and the motor holding portion are integrated, the first main body element is moved relative to the second main body element by fixing the motor holding portion to the first main body element by a fixing member or the like. In addition, the motor holder also moves relative to the second body element with the first body element.
In such a configuration, when providing the drive motor to the first main body element, it is possible to provide a configuration that is easy to assemble.

  Moreover, the shaft member for defining a rotational axis can be formed in a motor holding part as another form of the impact tool which concerns on this invention. In this case, since the rotation axis can be configured by fixing the motor holding portion having the shaft member to the first main body element, it is possible to achieve further improvement in manufacturing efficiency.

In addition, as another form of the striking tool according to the present invention, the second body element can have a second covering area covered by the first body element. In this case, the edge region on the tip tool holder side of the second body element can be used as the second covering region.
In the striking operation, debris of the workpiece generated during the machining operation with the tip tool scatters from the tip tool toward the handle portion. In such a situation, when the area on the tip tool holding portion side in the second main body element is set as the second covering area, it is possible to effectively prevent the inflow of the dust into the second main body element. In this sense, it can be said that the second covering area and the area of the first body element covering the second covering area constitute a dustproof mechanism.

Further, as another mode of the striking tool according to the present invention, the direction in which the biasing member biases the first main body element and the second main body element can be overlapped with the striking axis. According to the configuration, the biasing member is more susceptible to vibration in the striking axis direction with the drive of the striking element, thereby promoting relative movement between the first main body element and the second main body element more efficiently. It becomes possible.
In addition, when the biasing direction of a biasing member overlaps with a striking axis, the case where a biasing member is arrange | positioned coaxially with a center striking axis typically is mentioned. Even when the biasing member is not disposed coaxially with the central striking axis, it is sufficient if a portion of the biasing member is disposed on the striking axis.
In the arrangement form of the biasing member, the major axis of the biasing member is parallel to the striking axis, the major axis of the biasing member intersects the striking axis, and the major axis is overlapped with the striking axis. The biasing member may be arranged to be curved.

Moreover, the control part which controls the movement of the approach direction in a 1st main body element and a 2nd main body element can be comprised as another form of the impact tool which concerns on this invention. The restricting portion is configured inside the main body portion. In this case, it is possible to prevent the collision between the outer shell (the above-described exposed area) in the first body element and the second body element.
In this sense, the restricting portion can be said to constitute a collision prevention mechanism for preventing a collision between the exposed regions of the first main body element and the second main body element.

  In addition, as another form of the striking tool according to the present invention, the restricting portion can also serve as a guide portion for guiding the relative movement of the first main body element and the second main body element. The guide portion may be configured to contact a predetermined region of the first main body element and the second main body element, and slide the first main body element and the second main body element. Since the restricting portion doubles as the guide portion, it is possible to simplify the structure mechanically and to facilitate the assembly of the first main body element and the second main body element.

Further, as another embodiment of the striking tool according to the present invention, the drive motor can have an air inlet provided at one end and an air outlet provided at the other end. Furthermore, the main body portion can have an air circulation suppression mechanism. The air circulation suppression mechanism can be configured to be provided inside the main body between the intake port and the exhaust port and to suppress the circulation of air between the intake port and the exhaust port.
Note that a fan may be provided on the shaft of the drive motor in order to facilitate taking in air from the intake port and discharging it to the exhaust port. Furthermore, in the second main body element covering the drive motor, it is possible to provide the main body intake port in a region closer to the intake port than the exhaust port and provide the main body exhaust port in a region closer to the exhaust port than the intake port. is there.
In the present invention, the drive motor is configured to be moved relative to the second body element together with the first body element. Thus, a space for allowing relative rotation between the drive motor and the second body element is formed between the drive motor and the second body element covering the drive motor. The space can be referred to as a rotation permitted space. The air taken in from the intake port via the main body intake port is warmed by the heat in the drive motor and discharged from the exhaust port. However, depending on the configuration of the pivotable space, the air discharged from the exhaust port may rise in the pivotable space without being discharged from the main body exhaust port, and may be sucked again from the intake port. According to the striking tool according to this aspect, by having the air circulation suppressing mechanism, it is possible to suppress the phenomenon (the air circulation phenomenon in the rotation allowing space) in which the air discharged from the exhaust port is again sucked from the intake port. It is possible to promote the cooling of the drive motor.

  In addition, as another form of the striking tool according to the present invention, the air circulation suppressing mechanism can be configured by a wall-like member. In this case, the wall-like member blocks the movement of the air discharged from the exhaust port to the intake port. That is, the air discharged from the exhaust port is discharged from the main body exhaust port without returning to the intake port again. The wall-like member is configured to extend from the second main body element covering the drive motor, and to extend from the motor holding portion. In this case, the wall-like member can be integrally extended from a predetermined area of the second main body element or the motor holding portion. The wall-like member may be configured to attach a member independent of the second main body element or the motor holding portion to a predetermined area of the second main body element or the motor holding portion.

  Furthermore, the pivot axis can be positioned on the extension surface of the wall-like member. The wall member has surfaces facing each other and an intermediate portion located between the two surfaces. In this sense, the extending surface of the wall-like member is parallel to the extending direction of the wall-like member and also means either of the both surfaces or the middle portion of the wall-like member, assuming that the wall-like member is extended. It is defined as a passing plane. By positioning the extension surface of the wall-like member on the pivoting axis which is the pivoting center of the first main body element and the second main body element, narrowing the pivotable space located at the tip of the wall-like member It becomes possible. Therefore, it is possible to efficiently block the air traveling from the exhaust port to the intake port.

The wall-shaped member does not have to surround the entire area around the drive motor. For example, the respective regions of the second body element and the drive motor located on the rotation axis do not need to provide a rotation allowance space associated with the rotation of the first body element and the second body element. Therefore, in the said area | region, since it is possible to set it as the structure which arrange | positions a 2nd main body element and a drive motor in proximity, it is not necessary to provide a wall-like member in the said area | region. In the case of the said structure, it can be said that an air circulation suppression mechanism is comprised by each area | region in a 2nd main body element and drive motor which are located on a rotation axis.
In the configuration, the wall-like member can be provided in a region orthogonal to the rotation axis and the output axis of the drive motor and overlapping the rotation axis.

  In another aspect of the striking tool according to the present invention, the first body element and the second body element have overlapping regions overlapping each other. More specifically, the overlap area is formed by the first exposed area and the second covered area or the first covered area and the second exposed area. That is, the above-described stacked region constitutes an overlap region.

  The overlap region has a flexible member disposed on either the first body element or the second body element. The flexible member is disposed on the first body element or the second body element to constitute part or all of the covered area or exposed area. More specifically, the flexible member is disposed in any of the first covered area, the first exposed area, the second covered area, and the second exposed area. The flexible member can be composed of an elastomeric material.

  The overlap region is formed on the other of the first body element and the other of the second body element, and the flexible member is in sliding contact when the first body element and the second body element relatively reciprocate. And a sliding region. That is, the slid area is disposed in any of the first covering area, the first exposing area, the second covering area, and the second exposing area, in which the flexible member is not disposed. That is, the sliding region is configured in the flexible member non-arrangement region.

  According to the striking tool in this aspect, the flexible member is disposed on one of the first body element and the second body element in the overlap region, and the sliding region is formed on the other. By this, the gap formed between the first body element and the second body element in the overlap region is closed by the flexible member. Therefore, the flexible member can suppress the intrusion of dust generated during the operation into the main body. In this sense, it can be said that the flexible member and the sliding area constitute a dustproof mechanism.

  Moreover, as another form of the striking tool which concerns on this invention, a flexible member can comprise either one of a 1st coating | coated area | region and a 2nd coating | coated area | region. In this case, either the first covering area or the second covering area can be constituted by only the flexible member. Also, the first covering area or the second covering area can be configured by the flexible member and the first body element or the second body element.

  Moreover, as another form of the striking tool which concerns on this invention, a flexible member can be comprised in a 2nd main body element.

Further, as another aspect of the striking tool according to the present invention, in the case of assembling the first main body element and the second main body element, the flexible member can be a first main body element or a second The main body element can be configured to be elastically deformable. In this case, the first body element can have a tubular area with an opening, and the second body element can have an insertion area which is inserted into the tubular body from the opening during assembly. In the configuration, the area of the second body element inserted into the first body element forms a second covering area and the opening of the first body element covering the second covering area when the assembly is completed. The peripheral area constitutes a first exposed area. In the cylindrical region, the striking element is accommodated.
According to the striking tool according to this aspect, when the second main body element is inserted into the first main body element, the flexible member is deformed, so that the assembling operation can be easily performed.

  Furthermore, the second body element can be a two-part structure having one second body element and the other second body element. In the configuration, first, the first body element and one second body element are assembled, and then the other second body element is assembled to the first body element and one second body element. Under the present circumstances, when a flexible member is arrange | positioned, for example in the insertion area | region in the other 2nd main body element, when inserting the insertion area of the other 2nd main body element into the opening of the 1st main body element, the said opening peripheral area The flexible member abuts and is deformed. Therefore, when the other second main body element is assembled to the first main body element, the assembling operation can be facilitated. In addition. If the flexible member of the other second body element is inserted into the tubular portion in a deformed state and the other second body element is advanced relative to the first body element, the other second body element Is advanced to the first body element side while being guided by the deformed flexible member. Thus, the other second body element can be smoothly assembled to the first body element. In this sense, the flexible member can be said to constitute a guide portion when assembling the first body element and the second body element 1.

As another form of the striking tool according to the present invention, the flexible member can be integrally molded with either the first body element or the second body element in the overlap region.
According to the impact tool according to this aspect, it is possible to easily configure the flexible member.
An elastomeric non-slip portion may be provided on the handle portion of the second body element. In such a case, the non-slip portion and the flexible member can be configured to be continuous, and the second main body element, the non-slip portion and the flexible member can be integrally molded. In this configuration, it is possible to easily form the second body element, the flexible member, and the non-slip portion.

  According to the present invention, a more rational configuration for achieving vibration isolation in actual striking work has been provided.

It is an explanatory view showing an outline of an impact tool concerning a 1st embodiment of the present invention. It is sectional drawing which shows the drive mechanism of the front-end tool in the impact tool which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the anti-vibration mechanism in the said impact tool. It is the II sectional view taken on the line in FIG. It is the II-II sectional view taken on the line in FIG. It is the III-III sectional view taken on the line in FIG. It is an explanatory view showing operation of the impact tool concerned. It is the IV-IV sectional view taken on the line in FIG. It is explanatory drawing which shows the external appearance of the impact tool which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the drive motor in the said impact tool. It is explanatory drawing which shows the air circulation suppression mechanism in the said striking tool. It is explanatory drawing which shows the external appearance of the impact tool which concerns on 4th Embodiment of this invention. It is the VV sectional view taken on the line in FIG. It is explanatory drawing which shows the attachment state of the said striking tool. It is explanatory drawing which shows the overlap area | region of the impact tool which concerns on 5th Embodiment of this invention. It is explanatory drawing which shows the external appearance of the impact tool which concerns on 6th Embodiment of this invention.

  The impact tool according to the first to sixth embodiments will be described based on FIGS. 1 to 16. 1 is the first embodiment, FIGS. 2 to 8 are the second embodiment, FIGS. 9 to 11 are the third embodiment, FIGS. 12 to 14 are the fourth embodiment, and FIG. 15 is the fifth embodiment. FIG. 16 shows a sixth embodiment, respectively. In the description of the first to sixth embodiments, the same names and reference numerals may be used for parts and mechanisms having the same or similar functions, and the descriptions thereof may be omitted.

First Embodiment of the Present Invention
A first embodiment according to the present invention will be described based on FIG. In the first embodiment, general configurations related to the configurations of the second to sixth embodiments described later will be described in detail.

The striking tool 100 has a tip tool mounting portion 159 for mounting the tip tool 119, and a battery mounting portion 160 for mounting the battery 161, drives the tip tool 119 linearly, and performs a striking operation on the workpiece Carry out. The tip tool mounting portion 159 is configured to make the tip tool 119 detachable. The longitudinal direction of the tip tool mounting portion 159 defines the longitudinal direction of the striking tool 100. The long axis direction is parallel to the tip tool drive axis line on which the tip tool is driven. In addition, the battery mounting unit 160 is configured to make the battery 161 removable.
For convenience of explanation, in the long axis direction, the tip end side of the tip tool mounting portion 159 is defined as the front side, and the side opposite to the front side is defined as the rear side. Further, in the cross direction in the long axis direction, the side where the tip tool mounting portion 159 is disposed is defined as the upper side, and the side where the battery mounting portion 160 is disposed is defined as the lower side. If the definition regarding this direction is applied to FIG. 1, the right side, the left side, the upper side, and the lower side in FIG. 1 correspond to the front side, the rear side, the upper side, and the lower side in the impact tool 100, respectively.

  The striking tool 100 has a main body portion 101, a tip tool mounting portion 159, an output axis line 111a intersecting with the long axis direction, and is driven by an output of the drive motor 110 and a drive motor 110 driven by current from the battery 161. And the handle portion 109 held by the user, and the battery mounting portion 160. The output axis 111 a is defined by the extension direction of the shaft 111 of the drive motor 110. Further, the gravity center position 100 c of the striking tool 100 in a state in which the battery 161 is attached to the battery attachment portion 160 is designed to be on the drive motor 110. The handle portion 109 is provided with a trigger 109 a operated by the user in order to adjust the amount of current of the battery 161 supplied to the drive motor 110.

  The main body portion 101 mainly includes a first main body element 101 a and a second main body element 101 b. The first body element 101a is provided with a drive motor 110 and a striking element 140, and the second body element 101b is provided with a handle portion 109 and a battery mounting portion 160. The drive motor 110 is surrounded by a motor holding portion 110a, and the motor holding portion 110a is disposed in the first main body element. By such a configuration, the first main body element 101a and the drive motor 110 are integrated.

  In the first body element 101a and the second body element 101b, an exposed area exposed to the outside of the striking tool 100 is set. Furthermore, the first body element 101a and the second body element 101b have stacked areas overlapping each other. In the laminated area, the coated side constitutes an exposed area, and the coated side constitutes a coated area. In the stacking area, the area of the first body element 101a covered by the second body element 101b constitutes a first covering area 101a1. Also, the area of the second body element 101b covered by the first body element 101a constitutes a second covered area 101b1. The area of the first main body element 101a not covered by the second main body element 101b constitutes the first exposed area 101a2, and the area of the second main body element 101b not covered by the first main body element 101a constitutes the second exposed area 101b2. Do.

The drive motor 110 is disposed in the first covered area 101a1. That is, the drive motor 110 is covered by the second exposure area 101b2.
In addition, the second main body element 101b has a tip opening area 101ba that is an area including an opening provided on the tip side. The area of the second main body element 101b in which the tip opening area 101ba is not configured is taken as a main area 101bb. The rear end edge 101 aa of the first body element 101 covers the distal end edge of the distal end opening area 101 ba. That is, the end edge area | region by the side of the front-end tool holding part 159 in the 2nd main body element 101b is made into 2nd coating area | region 101 b1. With such a configuration, it is possible to prevent the dust scattered from the tip tool 119 toward the handle portion 109 in the striking work from flowing into the second main body element 101b2. In this sense, it can be said that the area including the rear side edge 101 aa of the first main body element 101 a and the second covered area 101 b 1 covered by the area constitute the dustproof mechanism 430. Further, as the dustproof mechanism 430, the tip end region of the second main body element 101b can be said to constitute an insertion region to be inserted into the first main body element 101a.
A stepped portion 101 bc is formed at the boundary between the tip end opening region 101 ba and the main region 101 bb.

The striking tool 100 has a vibration isolation mechanism 180 that suppresses the vibration associated with the driving of the striking element 140. The vibration isolation mechanism 180 is configured such that the first main body element 101a and the second main body element 101b are separated from each other and the first main body element and the second main body element are close to each other due to the vibration accompanying driving of the striking element 140. The first and second body elements are relatively reciprocally moved between them.
A specific example of the striking element 140 includes a piston that is linearly reciprocated by the drive motor 110, a striker, and an air chamber formed between the piston and the striker. In this case, when the piston moves toward the end tool, the air in the air chamber is compressed. As the compressed air expands, the striker is moved and collides with the tip tool, whereby the tip tool is moved. When the piston is moved to the side opposite to the tip tool, the air in the air chamber is expanded, and the contraction of the expanded air causes the striker to move to the side opposite to the tip tool. With such reciprocating movement of the piston, the tip tool is moved linearly along the tip tool drive axis. In addition, it is also possible to have an intermediate between the striker and the tip tool 119. The drive of the striking element 140 configured in this manner causes vibration in the long axis direction. The direction in which the piston reciprocates defines the striking axis. The striking shaft is sufficient if it passes through any area on the piston. When the tip tool 119 is attached to the tip tool attachment portion 159, a striking axis passing through the center of the tip tool 119 is particularly referred to as a center striking axis 140a.

  The main body portion 101 has a first area 100 a closer to the striking element 140 and a second area 100 b spaced apart from the striking element 140 than the first area 100 a. The striking element 140 and “adjacent” and “separating” are, for example, respective two points on the main body portion 101 in the longitudinal direction of the longitudinal direction, which are respectively connected to predetermined points on the striking element 140. It is possible to define by a linear distance. That is, an area having a point where the distance to a predetermined point of the striking element 140 is short in the cross direction is taken as a first area 100a, and an area having a point where the distance to the predetermined point of the striking element 140 is a second area It can be 100b.

  The first region 100a moves a longer distance than the second region 100b in the distance in the major axis direction when the first main element 101a and the second main element 101b are moved from being separated to being close to each other. Constitute a long distance moving area 200. With such a configuration, it is possible to achieve effective vibration isolation by setting the first area 100a strongly affected by the vibration from the striking element 140 as the long distance movement area 200. Further, the second region 100b is shorter than the first region 100a in the distance in the major axis direction when the first main element 101a and the second main element 101b are moved from being separated to being close to each other. It can be said that the moving short distance moving area 210 is configured. That is, by providing both the long distance movement region 200 and the short distance movement region 210 of the vibration isolation mechanism 180, it is possible to effectively suppress the vibration having a complicated directionality.

  Here, the first main body element 101a and the second main body element 101b will be described with respect to "a separated state" and "a close state". First, a predetermined point of the first main body element 101a and a predetermined point of the second main body element 101b in the long axis direction are defined. A distance between a predetermined point of the first main body element 101a and a predetermined point of the second main body element 101b is taken as a first position prescribed distance. Next, in a state in which the first main body element 101a and the second main body element 101b are moved relative to each other, a distance connecting a predetermined point of the first main body element 101a described above and a predetermined point of the second main body element 101b. As the second position prescribed distance. Then, it is assumed that the first position prescribed distance is longer than the second position prescribed distance. In this case, the positional relationship between the first main body element 101a and the second main body element 101b that form the first prescribed distance is "spaced apart". And the positional relationship of the 1st main body element 101a and the 2nd main body element 101b which form the 2nd prescribed distance will be in the "approximated state".

The first body element 101 a and the second body element 101 b are connected by the biasing member 181. The biasing member 181 biases the first main body element 101a and the second main body element 101b, whereby the first main body element 101a and the second main body element 101b are relatively reciprocated.
The biasing member 181 is formed of a member having spring elasticity. As a specific example of the biasing member 181, a coil spring can be mentioned. When a coil spring is used as the biasing member 181, the coil spring is fixed to the first body element by fixing one end of the coil spring to the first body element 101a and fixing the other end to the second body element 101b. It becomes possible to bias 101a and the 2nd main body element 101b. The biasing member 181 preferably biases the first main body element 101a and the second main body element 101b in a direction to separate them. As a result, when the first main body element 101a and the second main body element 101b move in the approaching direction, the outer shell of the first main body element 101a and the second main body element 101b are prevented from colliding with each other.

When the direction in which the biasing member 181 biases the first main body element 101a and the second main body element 101b is superimposed on the striking shaft, it is possible to effectively suppress the vibration caused by the driving of the striking mechanism 140. That is, according to such a configuration, the biasing member 181 is more likely to receive the vibration in the striking axis direction with the driving of the striking element 140, so the relative efficiency between the first main body element 101a and the second main body element 101b is more efficient. It is possible to urge The fact that the biasing direction of the biasing member 181 overlaps the striking axis typically includes the case where the biasing member 181 is disposed coaxially with the central striking axis 140a. Note that, as shown in FIG. 1, even if the biasing member 181 is not arranged coaxially with the central striking axis 140a, if a part of the biasing member 181 is disposed on the striking shaft, a predetermined one may be provided. Play an effect.
In the arrangement form of the biasing member 181, the major axis of the biasing member 181 is parallel to the striking axis, the major axis of the biasing member 181 intersects the striking axis, and the striking axis The biasing member 181 can be curved and disposed to overlap.

In the long distance movement region 200 and the short distance movement region 210, for example, the biasing member 181 is provided in each of the first region 100a and the second region 100b, and the biasing force of the biasing member 181 in the first region 100a is It can be configured by setting weaker than the biasing force of the biasing member 181 of the two regions 100b.
Further, the long distance movement area 200 and the short distance movement area 210 can be configured such that the first main body element 101 a and the second main body element 101 b relatively pivot around the pivot axis 182. In this case, the pivot axis 182 is provided closer to the second area 100b than the first area 100a. Furthermore, the rotation axis 182 can be provided closer to the barycentric position 100c of the striking tool 100 in the state where the battery 161 is attached to the battery attachment unit 160 than the striking axis. The state where the rotation axis 182 is closer to the center of gravity position 100c than the striking axis means, for example, an intersection of an imaginary line passing through the center of gravity 100c and orthogonal to the striking axis, and the imaginary line and the striking axis. Is defined, the distance from the pivot axis 182 to the center of gravity position 100c is shorter than the distance from the pivot axis 182 to the aforementioned intersection point.

The anti-vibration mechanism 180 constitutes a restricting portion 190 which restricts the movement in the separation direction and the movement in the proximity direction in the first main body element 101a and the second main body element 101b. By restricting the movement in the separation direction, the restricting portion 190 can prevent the first main body element 101a and the second main body element 101b from being separated. In addition, by restricting the movement in the approaching direction, the restricting portion 190 can prevent the rear end edge 101 aa of the first main body element 101 a from colliding with the step portion 101 bc of the second main body element 101 b. That is, the restriction portion 190 can suppress the generation of a scratch of the main body portion 101 caused by the collision of the first main body element 101a and the second main body element 101b. In this sense, the restricting portion 190 can constitute a collision prevention mechanism for preventing a collision between the first exposure region 101a2 and the second exposure region 101b2.
The restricting portion 190 is preferably disposed above the striking axis. With this configuration, setting of the movement distance in the separation direction between the first main body element 101a and the second main body element 101b in the long distance area 200 is facilitated.

  According to the above-described configuration, the first body element 101a and the second body element 101b relatively reciprocate due to the vibration accompanying the driving of the striking element 140, thereby suppressing the vibration transmitted to the user's hand. The relative reciprocating movement between the first main body element 101 a and the second main body element 101 b means a group having the striking element 140 and the drive motor 110, and a group having the handle portion 109 and the battery mounting portion 160. It can be paraphrased that is relatively reciprocally moving.

  In order to cool the drive motor 110, the drive motor 110 can be provided with a motor inlet 303 and a motor outlet 304. At this time, the main body intake port 301 and the main body exhaust port 302 are provided in the main body portion 101. The main body intake port 301 is provided in the area of the second covering area 101 b 1 closer to the motor intake port 303 than the motor exhaust port 304. Further, the main body exhaust port 302 is provided in the area of the second covering area 101 b 1 closer to the motor exhaust port 304 than the motor intake port 303.

  In the striking tool 100 according to the present invention, the first main body element 101a and the second main body element 101b are relatively moved while forming the long distance movement area 200 and the short distance movement area 210. . Therefore, particularly in the peripheral region of the drive motor 110, a rotation allowing space 320 is formed as a space for allowing relative movement of the drive motor 110 in the second main body element 101b. Depending on the configuration of the rotation allowing space 320, the air exhausted from the motor exhaust port 304 may not return to the motor intake port 303 without being discharged from the main body exhaust port 302 (recirculation). is there. When such an air circulation phenomenon occurs, it is difficult to achieve efficient cooling of the drive motor 110. In the present invention, the air circulation suppression mechanism 300 can be configured between the motor inlet 303 and the motor outlet 303 in order to prevent such a situation.

  As a specific example of the air circulation suppressing mechanism 300, a wall-shaped member 310 extending in a predetermined direction can be disposed inside the main body portion 101. The wall-like member 310 can be provided on either the first body element 101a or the second body element 101b. In FIG. 1, the example which provides a flange in a part of motor case 110a (1st main body element 101a), and comprises the wall-like member 310 is shown. A predetermined air gap is formed as the rotation allowing space 320 between the tip end of the wall member 310 and the inner region of the second main body element 101b. This makes it possible to prevent the tip of the wall member 310 from colliding with the inner wall of the second exposed area 101b2 due to relative movement of the first main body element 101a and the second main body element 101b. . In this sense, the air gap between the wall-like member 310 and the second body element 101b can be referred to as a collision avoidance air gap. When the wall-like member 310 is provided in the second main body element, the collision avoidance gap is formed between the tip of the wall-like member 310 and the first covering region 101a1 (motor case 110a).

With such a configuration, even if the air discharged from the motor exhaust port 304 tries to move to the motor intake port 303, the movement of the air is blocked by the wall-shaped member 310. Therefore, the air from the motor exhaust port 304 is discharged from the main body exhaust port 302 to the outside of the main body 101. That is, circulation of air from the motor exhaust port 304 to the motor intake port 303 is suppressed by the wall-like member 310.
In addition, although the wall-like member 310 is shown single structure in FIG. 1, it is also possible to provide several wall-like members 310. FIG.

Second Embodiment of the Present Invention
Hereinafter, a second embodiment of the present invention will be described based on FIGS. The second embodiment has a configuration in which the first main body element 101a and the second main body element 101b relatively rotate as compared with the first embodiment.
A second embodiment of the present invention will be described using a battery-type hammer drill 100 as an example of a striking tool. FIG. 2 is a cross-sectional view for describing a mechanism related to the striking operation and the rotational operation of the hammer drill 100. As shown in FIG. As shown in FIG. 2, the hammer drill 100 is a hand-held striking tool having a hand grip 109 gripped by the user, and the hammer bit 119 is driven in the long axis direction of the hammer bit 119 to make a workpiece On the other hand, it is configured to perform a striking operation for performing a striking operation such as a frying operation, and a rotational operation for rotating a hammer bit 119 around a long axis direction to perform a drilling operation on a workpiece. The longitudinal direction in which the hammer drill 100 drives the hammer bit 100 defines the longitudinal direction of the hammer drill 100. The long axis direction coincides with the long axis direction of the hammer bit 119 when the hammer bit 119 is attached to the hammer drill 100. A trigger 109 a operated by the user is disposed on the front side of the hand grip 109. The hammer drill 100 is an example of the "impact tool" according to the present invention, the hammer bit 119 is an example of the "tip tool" according to the present invention, and the hand grip 109 is an example of the "handle portion" according to the present invention. .

(Configuration of main unit)
As shown in FIG. 2, the hammer drill 100 mainly includes a main body portion 101 that forms an outer shell of the hammer drill 100 as a whole. A hammer bit 119 is detachably attached to the end region of the main body portion 101 via a cylindrical tool holder 159. The hammer bit 119 is inserted into the bit insertion hole 159a of the tool holder 159 so that relative reciprocating movement in the long axis direction is possible, and relative rotation in the circumferential direction is restricted. It is held. The tool holder 159 is an example of the “tip tool mounting portion” according to the present invention.

As shown in FIG. 2, the main body portion 101 is configured of a first main body element 101 a and a second main body element 101 b. The first main body element 101 a is an example of the “first main body element” according to the present invention, and the second main body element 101 b is an example of the “second main body element” according to the present invention.
The first main body element 101 a includes a motor housing 103 accommodating the electric motor 110, a gear housing 105 accommodating the motion conversion mechanism 120, the striking element 140 and the rotational power transmission mechanism 150, and both the motor housing 103 and the gear housing 105. It is mainly configured of an inner housing 104 to be fixed. The electric motor 110 is accommodated in the motor case 110 a and fixed to the motor housing 103. The motor housing 104 and the inner housing 104 are fixed by a fixing member 104 b such as a screw. Thereby, the electric motor 110 and the first main body element 101a are integrated. The motor case 110a is composed of an upper member and a lower member. After the electric motor 110 is surrounded by the upper and lower members, the upper and lower members are fixed by fixing means 110 b such as screws. The electric motor 110 is an example of the "drive motor" according to the present invention, and the motor case 110a is an example of the "motor holding portion" according to the present invention. Also, the tool holder 159 is attached to the first body element 101a.
The second main body element 101 b mainly includes a hand grip 109 and a battery mounting portion 160 for mounting a battery 161 for supplying an electric current to the electric motor 110. The battery mounting portion 160 is provided with a groove portion extending in the long axis direction and a terminal for electrically coupling with a terminal of the battery 161. The battery 161 is provided with a guide rail for engaging with the groove of the battery mounting portion 160 and a battery side terminal connected to the terminal of the battery mounting portion 160. The battery 161 is an example of the "battery" according to the present invention, and the battery mounting portion 160 is an example of the "battery mounting portion" according to the present invention.

  In the second embodiment, the tip end side of the tool holder 159 is defined as the front side in the long axis direction as in the first embodiment described in FIG. Define as the side. Further, in the cross direction in the long axis direction, the side on which the tool holder 159 is disposed is defined as the upper side, and the side on which the battery mounting portion 160 is disposed is defined as the lower side. If the definition regarding this direction is applied to Fig. 2, Fig. 3 and Fig. 7, the right side, left side, upper side and lower side in Fig. 2, 3 and 7 correspond to front side, rear side, upper side and lower side in hammer drill 100 respectively. Do. 4 shows a cross-sectional view taken along the line I-I in FIG. 3. The left side and the right side in FIG. 4 correspond to the left side and the right side in the hammer drill 100, respectively. In this sense, FIGS. 2, 3 and 7 can be said to show a right side cross-sectional view of the hammer drill 100.

As shown in FIG. 2, in the first main body element 101a, the gear housing 105 is disposed forward, the inner housing 104 is disposed rearward, and the motor housing 103 is disposed downwardly with respect to the longitudinal direction of the hammer bit 119. With such a configuration, the electric motor 110 is disposed in the first covered area 101a1. In the electric motor 110, the output axis line 111 a of the shaft 111 of the electric motor 110 intersects with the long axis direction of the hammer drill 100. The first exposed area 101a2 is an example of the "exposed area" according to the present invention, the first covered area 101a1 is an example of the "first covered area" according to the present invention, and the output axis 111a is the present invention. It is an example of “output axis”.
The second body element 101b is configured such that a hand grip 109 is disposed at the rear. A tip opening area 101ba is formed on the front side of the second main body element 101b, and a stepped portion 101bc is formed at the boundary between the tip opening area 101ba and the main area 101bb. The front area of the tip opening area 101ba is a second covering area 101b1. The second covered area 101 b 1 is an example of the “second covered area” according to the present invention. The hand grip 109 is formed in the main area 101bb in the second exposure area 101b2.
The second main body element 101b is configured by joining left and right halves divided into two along the major axis direction of the hammer bit 119 with each other by a fixing member 101c such as a screw.

(Configuration related to striking work and rotation work)
As shown in FIG. 2, the rotational output of the electric motor 110 is appropriately converted into a linear motion by the motion conversion mechanism 120 and transmitted to the striking element 140, and the major axis direction of the hammer bit 119 via the striking element 140. An impact force is generated (in the left and right direction in FIG. 1). The striking element 140 is an example of the "striking element" according to the present invention. Further, the rotational output of the electric motor 110 is appropriately decelerated by the rotational power transmission mechanism 150 and transmitted to the hammer bit 119, and the hammer bit 119 is rotationally operated in the circumferential direction. The electric motor 110 is energized and driven by a switch operated by pulling a trigger 109 a disposed on the hand grip 109.

  As shown in FIG. 2, the motion conversion mechanism 120 is disposed above the shaft 111 of the electric motor 110 and converts the rotational output of the shaft 111 into linear motion in the front-rear direction of the hammer drill 100. The motion conversion mechanism 120 includes an intermediate shaft 121 rotationally driven by a bevel gear 122 engaged with and engaged with the pinion gear 111b of the shaft 111, a rotating body 123 attached to the intermediate shaft 121, and an intermediate shaft 121 (rotating body 123). A rocking member 125 which is rocked in the front-rear direction of the hammer drill 100 with rotation, and a cylindrical piston 127 as a driving body which reciprocates in the front-rear direction of the hammer drill 100 with the rocking operation of the rocking member 125; A cylinder 129 accommodating the piston 127 is mainly configured. The cylinder 129 is disposed behind the tool holder 159 and is integrated with the tool holder 159. The swinging member 125 is attached to the rotating body 123 via a bearing 125a.

  As shown in FIG. 2, the striking element 140 is disposed above the motion conversion mechanism 120 and behind the tool holder 159, and the rotation of the electric motor 110 is converted by the motion conversion mechanism 120. This is a mechanism for transmitting a linear motion in the front-rear direction to the hammer bit 119 as a striking force. The striking element 140 is mainly composed of a striker 143 as an striker slidably disposed in the cylindrical piston 127, and an impact bolt 145 disposed as a meson on which the striker 143 collides and disposed in front of the striker 143. It is done. The space of the piston 127 at the rear of the striker 143 forms an air chamber 127a for transmitting the sliding motion of the piston 127 to the striker 143 via pressure fluctuation of air.

  As shown in FIG. 2, the rotational power transmission mechanism 150 is disposed on the front side of the motion conversion mechanism 120, and transmits the rotational output of the electric motor 110 transmitted from the intermediate shaft 121 of the motion conversion mechanism 120 to the tool holder 159. Mechanism. The rotational power transmission mechanism 150 is engaged with and engaged with the first gear 151, which rotates with the intermediate shaft 121, and the first gear 151, and a plurality of second gears 153, etc. attached to the tool holder 159 (cylinder 129). It is mainly composed of a gear reduction mechanism consisting of gears.

FIG. 3 is a cross-sectional view for explaining the anti-vibration mechanism 180 described later, and FIG. Specifically, FIG. 4 is a view of the handgrip 109 side in the I-I line cross section of FIG. 3. For the sake of convenience, the cross section of the piston 127 is shown in FIG. 4 in order to clarify the relationship between the parts.
As shown in FIG. 4, the switching mechanism 170 which switches the drive mode of the hammer drill 100 is comprised by the 1st main body element 101a. The switching mechanism 170 has an operation dial 171 operated by the user, and the switching operation of the operation dial 171 causes a hammer mode in which the hammer bit 119 performs a striking operation and a drill mode in which the hammer bit 119 performs a rotation operation. The hammer drill mode in which the hammer bit 119 performs both the linear operation and the rotational operation is appropriately selected. The description of the configuration of the switching mechanism 170 and the operations of the motion conversion mechanism 120 and the rotational power transmission mechanism 150 accompanying the switching of the switching mechanism 170 will be omitted for convenience.

(Configuration of vibration isolation mechanism)
The vibration isolation mechanism 180 will be described based on FIGS. 3 and 5 to 8. As shown in FIG. 3, the anti-vibration mechanism 180 includes an urging member 181 for urging the first main body element 101 a and the second main body element 101 b in a direction separating the first main body element 101 a and the second main body element 101 b. Of the first main body element 101a and the second main body element 101b, and restricting movement of the first main body element 101a and the second main body element 101b. The vibration isolation mechanism 180 is an example of the “vibration isolation mechanism” according to the present invention, the biasing member 181 is an example of the “biasing member” according to the present invention, and the rotation axis 182 is the “rotation” according to the present invention The regulating unit 190 is an example of the “regulating section” according to the present invention.

  As shown in FIG. 3, the biasing member 181 is constituted by a coil spring. One end of the biasing member 181 is fixed to the first main body element 101a, and the other end is fixed to the second main body element 101b. Specifically, one end side of the biasing member 181 is fixed to the biasing member support portion 104a provided in the area of the inner housing 104 located at the rear of the gear housing 105, and the other end side is fixed to the second main body element 101b. It is fixed to the attached support plate 101b3. At this time, the central axis of the biasing member 181 is coaxial with the central striking axis 140a.

As shown in FIG. 3, the rotary shaft 182 is provided closer to the center of gravity position 100 c of the hammer drill 100 than the central striking axis 140 a. The center-of-gravity position 100 c is in a state where the battery 161 is attached to the battery attachment unit 160. The center of gravity position 100c is an example of the "center of gravity position" according to the present invention.
The detailed configuration of the pivot axis 182 will be described based on FIG. FIG. 5 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 5, the pivot axis 182 extends in the left-right direction which is a direction orthogonal to the long axis direction of the hammer drill 100. The pivot axis 182 projects to the outside of the motor case 110a and has a recess. The first axis support 182a has a recess. The second axis support 182b protrudes to the inside of the second main body element 101b and has a recess. It is comprised by the shaft member 182c fitted by both the recessed part of 182a, and the recessed part of the 2nd axial support part 182b. That is, the rotation axis 182 is a straight line passing through the long axis direction of the shaft member 182c. The end of the projecting portion of the first shaft support portion 182a is in contact with the end of the projecting portion of the second shaft support portion 182b. Since the first shaft support portion 182a is provided on the motor case 110a, the shaft member 182c can be formed on the motor case 110a. The shaft member 182c is an example of the "shaft member" according to the present invention.

  The restricting portion 190 shown in FIG. 3 restricts the movement in the proximity direction and the movement in the separation direction in the first body element 101a and the second body element 101b. The restricting portion 190 is formed on the upper side of the center striking axis 140a. That is, the restricting portion 190 is disposed at a position separated from the rotation axis 182. With this configuration, it is possible to increase the length of the restricting portion 190 in the long axis direction. Therefore, the relative movement distance in the 1st main body element 101a and the 2nd main body element 101b is securable, without rigidifying structural accuracy of regulation part 190 itself.

  A specific configuration of the restricting unit 190 will be described based on FIG. 6 is a cross-sectional view taken along the line III-III in FIG. The restricting portion 190 is formed in a predetermined region of the first main body element 101a and the second main body element 101b overlapping each other. The first main body element 101 a side is a first restriction area 191, and the second main body element 101 b is a second restriction area 192. In the second embodiment, the first restriction area 191 is formed outside the first covering area 101a1, and the second restriction area 192 is formed inside the second exposure area 101b2.

As shown in FIG. 6, the first restriction area 191 is formed in a first main body element 101a (first covered area 101a1) extending in the long axis direction in the second main body element 101b, and a front side wall 191a, It has a rear side wall portion 191c, and an extending portion 191b provided between the front side wall portion 191a and the rear side wall portion 191c and extending in the long axis direction. The front side wall portion 191 a, the extension portion 191 b, and the rear side wall portion 191 c are formed in the outward direction of the hammer drill 100.
The second restriction area 192 is formed in the second exposure area 101b2 covering the first restriction area 191, and is formed between the front rib 192a, the rear rib 192c, and the front rib 192a and the rear rib 192c. And an intermediate rib 192b. The front rib 192 a, the middle rib 192 b, and the rear rib 192 c are formed in the inward direction of the hammer drill 100.
The tip of the front rib 192a and the tip of the rear rib 192c are configured to abut on the extension 191b. With such a configuration, as described later, the front rib 192a, the rear rib 192c, and the extension portion 191b guide the sliding guide portion 193 that guides the relative movement between the first main body element 101a and the second main body element 101b. Configure. The sliding guide portion 193 is an example of the “guide portion” according to the present invention. The intermediate rib 192 b has a function of securing the strength of the second restriction area 192. That is, it can be said that the second restriction area 192 has a strength holding element.

(About the operation of hammer drill)
Next, the operation of the hammer drill 100 according to the second embodiment will be described based on FIGS. 3 and 6 to 8. FIGS. 3 and 6 show a state in which the first main body element 101 a and the second main body element 101 b are biased by the biasing member 181 and pivoted in the direction away from each other about the pivot axis 182. FIG. 7 shows a state in which the first main body element 101 a and the second main body element 101 b are pivoted in the approaching direction about the pivot axis 182 against the biasing force of the biasing member 181. 8 is a cross-sectional view taken along line IV-IV shown in FIG.
The vibration isolation mechanism 180 vibrates with the driving of the striking element 140 in the hammer mode or the hammer drill mode to cause the first main body element 101a and the second main body element 101b to be in the state shown in FIG. 3 and the state shown in FIG. It rotates relatively around the rotation axis 182.

The hammer drill 100 has a first area 100a closer to the striking element 140 and a second area 100b spaced farther from the striking element 140 than the first area 100a. The first area 100 a is an example of the “first area” according to the present invention, and the second area 100 b is an example of the “second area” according to the present invention. When the first main body element 101a and the second main body element 101b relatively rotate around the rotation axis 182, the distance in the major axis direction in which the first main body element 101 and the second main body element 101 move is The first area 100a is longer than the second area 100b. That is, the first area 100 a constitutes a long distance movement area 200, and the second area 100 b constitutes a short distance movement area 210. The long distance moving area 200 is an example of the "long distance moving area" according to the present invention.
The hammer drill 100 is configured such that the first region 100 a close to the striking element 140 is a long distance movement distance 200. This makes it possible to more effectively suppress the vibration associated with the driving of the striking element 140. In particular, since the central axis of the biasing member 180 coincides with the central striking axis 140a, the biasing member 180 can efficiently receive the vibration of the striking element 140.

Incidentally, in the restriction mechanism 190, when the first main body element 101a and the second main body element 101b move in the direction of separating from each other, as shown in FIG. 6, the rear side rib 192c is formed on the rear side wall 191c. Abut. Thereby, the movement of the first main body element 101a and the second main body element 101b in the direction in which they are further separated can be restricted.
Further, when the first main body element 101a and the second main body element 101b move in the direction in which they approach each other, as shown in FIG. 8, the front side rib 192a abuts on the front side wall 191a. Thereby, movement of the first main body element 101a and the second main body element 101b in the direction in which they are further approached can be restricted. In particular, it is possible to prevent contact between the rear end edge 101 aa of the first main body element 101 a shown in FIG. 2 and the step portion 101 bc of the second main body element 101 b.

Further, in the restricting portion 190, the sliding guide portion 193 is configured by bringing the extension portion 191b into contact with the front rib 192a and the rear rib 192c. In the case where the first main body element 101a and the second main body element 101b are rotated about the rotation axis 182 by the sliding guide portion 193, the first main body element 101a and the first main element 101a with respect to the left and right direction It becomes possible to prevent relative movement with the two main body elements 101b.
That is, the restricting portion 190 can be configured to restrict the movement distance of the first main body element 101a and the second main body element 101b in the rotation direction and the movement distance of the rotation axis 182 in the extension direction. It is.

Further, in the region where the front rib 192a and the rear rib 192c move relative to the extending portion 191b, the extending portion 191b is smoothed so as not to impede the movement of the front rib 192a and the rear rib 192c. . In this sense, it can be said that the extension portion 191b has a smooth region, and the front rib 192a and the rear rib 192c are configured to be slidable with respect to the smooth region. The smooth region means that there is no obstacle that inhibits the sliding between the front rib 192a and the rear rib 192c, and in this sense, the smooth region is referred to as an obstacle non-formation region. it can.
Based on the above operation, the hammer drill 100 can effectively suppress the vibration associated with the driving of the striking element 140.

Third Embodiment of the Present Invention
Hereinafter, a third embodiment of the present invention will be described based on FIG. 9 to FIG.
The hammer drill 100 which concerns on 3rd Embodiment has the air circulation suppression mechanism 300 compared with the hammer drill 100 which concerns on 2nd Embodiment. The air circulation suppressing mechanism 300 is an example of the "air circulation suppressing mechanism" according to the present invention.

  As shown in FIG. 9, the second main body element 101 b of the hammer drill 100 according to the third embodiment includes a main body intake port 301 for taking in external air, and a main body exhaust port 302 for discharging air inside the main body portion 101. And. A drive motor 110 is disposed in the first covered area 101 a 1 between the main body intake port 301 and the main body exhaust port 302 inside the main body portion 101. As a result, since the air taken in from the main body intake port 301 passes through the drive motor 110 while being discharged to the main body exhaust port 302, the drive motor 110 can be cooled.

As shown in FIG. 10, a motor intake port 303 is provided on the top surface of the drive motor 110. A motor case intake port 306 is provided in a region of the motor case 110 a corresponding to the motor intake port 303. Further, inside the drive motor 110, a fan 305 attached to the shaft 111 and rotationally driven by the shaft 111 is provided. A motor exhaust port 304 is provided in an outer region of the drive motor 110 corresponding to the fan 305, and a motor case exhaust port 307 is provided in a region of the motor case 110 a corresponding to the motor exhaust port 304. The motor inlet 303 is an example of the "inlet" according to the present invention, and the motor outlet 304 is an example of the "outlet" according to the present invention.
As a result, the air taken in from the main body intake port 301 passes through the motor case intake port 306 and the motor intake port 303 by the rotation of the fan 305 and is sucked into the drive motor 110. The air in the drive motor 110 passes through the motor exhaust port 304 and the motor case exhaust port 307 by the rotation of the fan 305, and is discharged to the main body exhaust port 302. As described above, by passing the air through the drive motor 110, it is possible to enhance the cooling effect of the drive motor 110.

  Furthermore, as shown in FIG. 11, in the hammer drill 100 according to the third embodiment, a wall-shaped member 310 is provided as the air circulation suppressing mechanism 300. This wall-like member 310 is an example of the "wall-like member" according to the present invention. The wall-like member 310 is formed of a rib that protrudes inward from the inner wall of the second exposed area 101 b 2 covering the drive motor 110. The wall member 310 surrounds the drive motor 110, and a predetermined gap is formed between the tip (inner peripheral edge) of the wall member 310 and the drive motor 110 as the collision avoidance gap described with reference to FIG. . Even when the first main body element 101a and the second main body element 101b move relative to each other, the wall-shaped member 310 and the drive motor 110 do not collide with each other due to the air gap.

As shown in FIG. 11, the wall-like member 310 is configured of a first wall-like member 311 and a second wall-like member 312. The extension surface 311a of the first wall member 311 is placed on the motor intake port 303 (motor case intake port 306) in a state where the first main body element 101a and the second main body element 101b are separated. Further, on the extension surface 312a of the second wall member 312, a pivot axis 182 is positioned. Here, the extension surface of the wall-like member 310 will be described. The wall-like member 310 has surfaces facing each other and an intermediate portion located between the two surfaces. The extension surface of the wall member 310 is parallel to the extension direction of the wall member 310 when assuming that the wall member 310 is extended, and either of the both surfaces or the middle portion of the wall member 310 It is defined as a passing plane.
Further, the output axis line 111a of the drive motor 110 and the extension surface 312a of the second wall member 312 in a state in which the first main body element 101a and the second main body element 101b are not rotated are orthogonal to each other. That is, the extension surface 312 a of the second wall member 312 is located at the rotation axis 182 and orthogonal to the output axis 111 a of the drive motor 110.
As another configuration, the output of the drive motor 110 when the first main body element 101a and the second main body element 101b are closest to each other while the first main body element 101a and the second main body element 101b are rotating. The axis 111 a may be orthogonal to the extension surface 312 a of the second wall member 312.

In the hammer drill 100 according to the third embodiment, the second wall member 312 is not configured in the region located on the pivot axis 182. That is, since it is not necessary to provide the rotation allowing space 320 in the region located on the rotation axis 182, the second main body element 101b and the drive motor 110 are disposed adjacent to each other. In this sense, it can be said that the respective regions of the second main body element 101b and the drive motor 110 located on the rotation axis 182 constitute the air circulation suppression mechanism 300.
That is, the second wall member 312 is provided centering on a region orthogonal to both the pivot axis 182 and the output axis 111 a of the drive motor 110 and overlapping with the pivot axis 182. More specifically, the second wall member 312 extends from a region adjacent to the rear side of one second shaft support portion 182b (see FIG. 5) to a region adjacent to the rear side of the other second shaft support portion 182b. It is comprised by the part provided and the part provided over the area | region adjacent to the front side of the other 2nd axial support part 182b from the area | region adjacent to the front side of one 2nd axial support part 182b. With this configuration, it is possible to simultaneously achieve the different functions of downsizing of the second body element 101b covering the drive motor 110 and cooling of the drive motor 110.
The first wall member 311 is configured to surround the drive motor 110. A predetermined air gap (collision avoidance air gap) is provided between the first wall member 311 and the drive motor 110.

With such a configuration, in the hammer drill 100 according to the third embodiment, as in the hammer drill 100 according to the first embodiment and the second embodiment, the first main body element 101a and the second main body element 101b are pivot axes 182 Relative to each other. Thereby, the vibration transmitted to the user's hand can be suppressed.
Further, the air discharged from the motor exhaust port 304 is efficiently discharged from the main body exhaust port 302 in order to block the flow of air which the wall-like member 310 tries to move from the motor exhaust port 304 to the motor intake port 303. Thus, in the hammer drill 100 according to the third embodiment, the drive motor 110 can be cooled.

Fourth Embodiment of the Present Invention
Hereinafter, a fourth embodiment of the present invention will be described based on FIGS. 12 to 14.
FIG. 12 is a view showing the appearance of the hammer drill 100 of the fourth embodiment. As described above, the first main body element 101a and the second main body element 101b form a stacked region overlapping each other, and in the stacked region, the covering side constitutes the exposed region (first exposed region 101a2, second exposed region 101b2) The side to be covered constitutes a covered area (a first covered area 101a1, a second covered area 101b1). In this sense, the stacked region can be said to constitute an overlap region 400 in which the exposed region and the covering region overlap (overlap). The hammer drill 100 of the fourth embodiment differs from the configuration of the hammer drill 100 of the third embodiment in the configuration of the overlap region 400. The overlap area 400 is an example of the "overlap area" according to the present invention.

FIG. 13 is a view for explaining the overlap region 400, and shows a part of a cross section taken along the line V-V in FIG. The second body element 101 b has a flexible member 411. The flexible member 411 covers the first exposed area 101a2 to form a second covered area 101b1. The flexible member 411 is an example of the "flexible member" according to the present invention. The flexible member 411 is made of an elastomer and is integrally molded with the second main body element 101b.
More specifically, the second main body element 101b has a flexible member disposition area 410 including a front side projecting portion 410a and a rear side projecting portion 410b in the front end area. The flexible member 411 includes a convex portion 411a disposed between the front side projecting portion 410a and the rear side projecting portion 410b, a concave portion 411b in which the front side projecting portion 410a is disposed, and a front side from the concave portion 411b. And a protrusion 411d provided at the tip of the extension 411c and configured to contact the side surface of the first exposed area ba2.

The vibration isolation mechanism 180 reciprocates the first main body element 101a and the second main body element 101b relative to each other in accordance with the drive operation of the hammer drill 100. In this state, the protrusion 411d of the flexible member 411 Is in sliding contact with the side surface of the first exposed area 101a2. That is, the mechanism side surface of the first exposed area 101a2 constitutes a slidable area 420. The sliding region 420 is an example of the “sliding region” according to the present invention.
The flexible member 411 and the sliding region 420 constitute the dustproof mechanism 430 by closing the gap formed between the first exposure region 101a2 and the second covering region 101b1. The dustproof mechanism 430 can suppress dust generated by the processing operation of the hammer drill 100 from entering between the first exposed area 101a2 and the second covered area 101b1. Therefore, in the hammer drill 100 according to the fourth embodiment, it is possible to reduce the failure due to the dust entering the main body portion 101 and further to prolong the life of the hammer drill 100.

Further, the flexible member 411 can facilitate the assembly of the first main body element 101a and the second main body element 101b.
As shown in FIG. 14, the second main body element 101 b has a bifurcated structure including a right side second main body element 101 bd and a left side second main body element 101 be. In addition, the first main body element 101a has a tubular portion 101ac provided with an opening 101ab. The striking element 140, the rotational power transmission mechanism 150, and the like are disposed in the cylindrical portion 101ac.
When assembling the first main body element 101a and the second main body element 101b having the configuration, as shown in FIG. 14, first, the first main body element 101a and the left second main body element 101be in a state where the mechanism is assembled are assembled. . At this time, the flexible member 411 of the left second main body element 101be is inserted into the tubular portion 101ac through the opening 101ab of the first main body element 101a. Thereby, the flexible member 411 of the left side second main body element 101be constitutes the second covered area 101b1. In this sense, the flexible member 411 can be said to constitute an insertion area 101bf at the time of assembly. Further, after the first main body element 101a and the left second main body element 101be are assembled, a predetermined mechanism is further arranged to the first main body element 101a and the left second main body element 101be.

Then, the right side second main body element 101bd is assembled to the first main body element 101a and the left side second main body element 101be. First, the flexible member 411 (insertion area 101bf) of the right side second main body element 101bd is inserted into the cylindrical portion 101ac through the opening 101ab of the first main body element 101a. At this time, the flexible member 411 can abut on the opening edge (rear end edge 101 aa) of the opening 101 ab and can be deformed. Thus, the flexible member 411 can be inserted into the cylindrical portion 101ac. Under the present circumstances, while inserting the front-end | tip part of the flexible member 411 in the cylindrical part 101ac, it can be made to advance further in the cylindrical part 101ac, curving the flexible member 411, but in the said state, Since the flexible member 411 serves as a guide function when inserting the right side second main body element 101bd into the first main body element 101a, the assembling work can be easily performed.
As described above, the hammer drill 100 of the fourth embodiment has a dustproof function by the flexible member 411 and an assembling easy function in addition to the function exhibited by the hammer drill 100 of the third embodiment.

Fifth Embodiment of the Present Invention
Hereinafter, a fifth embodiment of the present invention will be described based on FIG.
FIG. 15 is an explanatory view showing the overlap region 400 of the hammer drill 100 of the fifth embodiment. As shown in FIG. 15, in the hammer drill 100 of the fifth embodiment, a flexible member 411 is provided on the first main body element 101a. That is, the flexible member disposition area 410 having the front side projecting portion 410a and the rear side projecting portion 410b is configured in the first main body element 101a. In addition, on the outer side (the side opposite to the side on which the mechanism is disposed) of the second covering area 101b1 in the second main body element 101b, there is a sliding area 420 where the projection 411d of the flexible member 411 slides. Configured
With this configuration, the hammer drill 100 of the fifth embodiment also has the dustproof function by the flexible member 411 and the function of easy assembly as in the hammer drill 100 of the fourth embodiment.

Sixth Embodiment of the Present Invention
Hereinafter, a sixth embodiment of the present invention will be described based on FIG.
FIG. 16 is an explanatory view showing the appearance of the hammer drill 100 of the sixth embodiment. The hammer drill 100 of the sixth embodiment is obtained by further adding a device for the flexible member 411 to the hammer drill 100 of the fourth embodiment.
The hammer drill 100 shown in FIG. 16 is provided with a bumper 101d on the second main body element 101b. The user may place the hammer drill 100 on a desk or a floor, but the second main body element 101b may be damaged due to the material and the shape of the placement place. In the hammer drill 100 of the sixth embodiment, since the bumper 101d is formed on the exterior of the second main body element 101, it is possible to suppress the occurrence of a scratch when the hammer drill 101 is placed on the placement place.
The bumper 101d is formed of an elastomer. In the hammer drill 100 of the sixth embodiment, the bumper 101d and the flexible member 411 are formed continuously. Therefore, the second main body element 101b, the flexible member 411 and the bumper 101d can be efficiently integrally molded.

  With this configuration, the hammer drill 100 of the sixth embodiment also has the dustproof function by the flexible member 411 and the function of easy assembly as in the hammer drill 100 of the fourth embodiment. Furthermore, since the bumper 101d is formed, it is possible to suppress the occurrence of a scratch in the second main body element 101b. Further, since the bumper 101d, the flexible member 411, and the second main body element 101b can be integrally molded, an increase in manufacturing cost can be suppressed.

Although the hammer drill 100 according to the present embodiment has been described in the case of the hammer drill, it may be applied to a hammer which causes the hammer bit 119 to perform only a striking operation in the long axis direction, or a reciprocating linear motion of the blade The present invention may be applied to cutting work tools such as reciprocating saws and jig saws that perform cutting work of workpieces.
In addition, although the bumper 101d is described as the configuration of the elastomer disposed in the main body portion 101, the configuration of the elastomer is not limited to this, and for example, non-slip formed on the hand grip 109 may be mentioned. The configuration using the elastomer can be integrally molded with the flexible member 411 with respect to the main body. In this case, in the case where the configuration by the elastomer and the configuration by the flexible member 411 are made to be continuous, it is possible to perform the integral molding more efficiently, so it is possible to suppress the improvement of the manufacturing cost. It becomes.

In view of the meaning of the above invention, the hammer drill concerning the present invention can constitute the following modes. Each aspect is used not only alone or in combination with each other, but also in combination with the invention described in the claims.
(Aspect 1)
In the distance in the major axis direction when the first body element and the second body element are moved from being separated to being close to each other, the second region has a distance shorter than that of the first region. Construct a moving short-distance movement area.
(Aspect 2)
In the cross direction of the long axis direction of the striking tool, the side where the tip tool mounting portion is disposed is defined as the upper side, and the side where the battery mounting portion is disposed is defined as the lower side. The portion is disposed above the striking axis.
(Aspect 3)
A gap is formed between the tip of the wall-like member and the inner wall of the main body.
(Aspect 4)
The flexible member and the slid area constitute a dustproof mechanism that suppresses the ingress of dust from the overlap area.
(Aspect 5)
The flexible member constitutes a guide portion when the second body element is inserted into the first body element.

(Correspondence between each component of the embodiment and the component of the present invention)
The relationship between each component in the present embodiment and the invention specific matter of the component in the present invention is as follows. Of course, each component in the present embodiment is only one example of implementation configuration relating to the specific item of the present invention, and each component of the present invention is not limited to this.
The hammer drill 100 is an example of the “impact tool” according to the present invention. The hammer bit 119 is an example of the “tip tool” according to the present invention. The hand grip 109 is an example of the "handle portion" according to the present invention. The tool holder 159 is an example of the “tip tool mounting portion” according to the present invention. The first body element 101a is an example of the "first body element" according to the present invention. The second body element 101 b is an example of the “second body element” according to the present invention. The electric motor 110 is an example of the “drive motor” according to the present invention. The motor case 110a is an example of the "motor holding portion" according to the present invention. The battery 161 is an example of the "battery" according to the present invention. The battery mounting unit 160 is an example of the “battery mounting unit” according to the present invention. The first exposed area 101a2 is an example of the "exposed area" according to the present invention. The first covered area 101a1 is an example of the "first covered area" according to the present invention. The output axis 111a is an example of the "output axis" according to the present invention. The second covered area 101 b 1 is an example of the “second covered area” according to the present invention. The striking element 140 is an example of the "striking element" according to the present invention. The vibration isolation mechanism 180 is an example of the “vibration isolation mechanism” according to the present invention. The biasing member 181 is an example of the "biasing member" according to the present invention. The pivot axis 182 is an example of the “pivot axis” according to the present invention. The regulating unit 190 is an example of the “regulating unit” according to the present invention. The center of gravity position 100c is an example of the "center of gravity position" according to the present invention. The shaft member 182c is an example of the "shaft member" according to the present invention. The sliding guide portion 193 is an example of the “guide portion” according to the present invention. The first area 100a is an example of the "first area" according to the present invention. The second area 100 b is an example of the “second area” according to the present invention. The long distance moving area 200 is an example of the "long distance moving area" according to the present invention. The air circulation suppression mechanism 300 is an example of the “air circulation suppression mechanism” according to the present invention. The motor intake 303 is an example of the "intake" according to the present invention. The motor exhaust port 304 is an example of the “exhaust port” according to the present invention. The wall-like member 310 is an example of the “wall-like member” according to the present invention. The overlap area 400 is an example of the "overlap area" according to the present invention. The flexible member 411 is an example of the “flexible member” according to the present invention. The sliding region 420 is an example of the “sliding region” according to the present invention.

100 hammer drill (impact tool)
100a first region 100b second region 100c center of gravity position 101 main body (tool main body)
101a 1st main body element 101a1 1st covering field 101a2 1st exposure field (exposure field)
101aa Rear edge 101ab Opening 101ac Tubular part 101b Second body element 101b1 Second covering area 101b2 Second exposure area 101b3 Support plate 101ba Tip opening area 101bb Main area 101bc Stepped part 101bd Right second main body element 101be Left second main body Element 101bf Insertion area 101c Fixing member 101d Bumper 103 Motor housing 104 Inner housing 104a Biasing member support portion 104b Fixing member 105 Gear housing 109 Hand grip (handle portion)
109a trigger 109b switch 110 electric motor (drive motor)
110a Motor case (motor holding part)
110b Fixing member 111 Shaft 111a Output axis line 111b Pinion gear 119 Hammer bit (tip tool)
120 motion conversion mechanism 121 intermediate shaft 122 bevel gear 123 rotating body 125 rocking member 125 a bearing 127 piston 127 a air chamber 129 cylinder 140 striking element (impact mechanism)
140a central striking axis line 143 striker 145 impact bolt 150 rotational power transmission mechanism 151 first gear 153 second gear 159 tool holder (tip tool mounting portion)
159a bit insertion hole 160 battery mounting portion 161 battery pack (battery)
170 switching mechanism 171 operation dial 180 anti-vibration mechanism 181 biasing member 182 pivoting axis 182a first shaft support portion 182b second shaft support portion 182c shaft member 190 restricting portion 191 first restricting region 191a front side wall portion 191b extension portion 191c rear side wall Part 192 second restriction area 192a front side rib 192b middle rib 192c rear side rib 193 sliding guide part (guide part)
200 long distance moving area 210 short distance moving area 300 air circulation suppressing mechanism 301 main body intake port 302 main body exhaust port 303 motor intake port (intake port)
304 Motor exhaust port (exhaust port)
305 fan 306 motor case intake port 307 motor case exhaust port 310 wall shaped member 311 first wall shaped member 311a extending surface 312 second wall shaped member 312a extending surface 320 rotation permitting space 400 overlapping area 410 flexible member arranging area 410a front side projecting portion 410b rear side projecting portion 411 flexible member 411a convex portion 411b concave portion 411c extending portion 411d projecting portion 420 sliding region 430 dustproof mechanism

Claims (15)

An impact tool which linearly drives a tip tool and performs an impact operation on a workpiece,
Body part,
A distal end tool mounting portion extending in a predetermined longitudinal direction;
A drive motor having an output axis intersecting the long axis direction;
A striking element driven by the output of the drive motor and having a striking axis parallel to the long axis direction;
A handle that is gripped by the user,
A battery mounting unit for mounting a battery for supplying current to the drive motor;
The body portion includes a first body element, a second body element, a biasing member for biasing the first body element and the second body element, a first region adjacent to the striking element, and And a second area spaced from the striking element more than one area;
The first body element is provided with the drive motor and the striking element;
The second body element is provided with the handle portion and the battery mounting portion.
The impact tool further includes an anti-vibration mechanism that suppresses vibration associated with driving of the impact element.
The anti-vibration mechanism separates the first main body element and the second main body element from the first main body element and the second main body element via the biasing member due to the vibration associated with the driving of the striking element, the first main body element and the second Relatively reciprocating movement of the first body element and the second body element between a state in which the body element is in close proximity to the body element;
In the distance in the major axis direction when the first body element and the second body element are moved from being separated to being close to each other, the first region is longer than the second region. Configure a long distance travel area to travel ,
The first body element comprises a first covered area covered by the second body element and an exposed area not covered by the second body element
The impact tool according to claim 1, wherein the drive motor is provided in the first covering area . A striking tool according to claim 1, wherein
The battery mounting portion has a center-of-gravity position in a state where the battery is mounted;
The first body element and the second body element are configured to be relatively pivoted about a pivot axis,
The striking tool according to claim 1, wherein the pivot axis is closer to the center of gravity than the striking axis. An impact tool according to claim 1 or 2 , wherein
The drive motor is disposed in a motor holding unit.
The impact tool according to claim 1, wherein the first body element is integrated with the motor holder. A striking tool according to claim 3 , wherein
A shaft tool for defining the rotation axis is formed in the motor holding portion. It is an impact tool described in any one of Claims 1-4 , Comprising :
Impact tool according to claim 1, characterized in that the second body element has a second covering area which is covered by the first body element. It is an impact tool described in any one of Claims 1-5 , Comprising :
An impacting tool characterized in that a direction in which the biasing member biases the first body element and the second body element overlaps the striking axis. The impact tool according to any one of claims 1 to 6 , wherein
A striking tool characterized in that a restricting portion which restricts the movement of the first body element and the second body element in the proximity direction is formed inside the body portion. A striking tool according to claim 7 , wherein
The impact tool, wherein the restricting portion doubles as a guide portion for guiding relative movement of the first main body element and the second main body element. The impact tool according to any one of claims 2 to 8 , wherein
The drive motor has an air inlet provided at one end and an air outlet provided at the other end.
The main body portion has an air circulation suppression mechanism,
The air circulation suppressing mechanism is provided inside the main body between the intake port and the exhaust port and configured to suppress air from circulating between the intake port and the exhaust port. A striking tool characterized by having 10. A striking tool according to claim 9 , wherein
The air circulation suppressing mechanism is constituted by a wall-like member,
The striking tool according to claim 1, wherein the pivot axis is located on an extension surface of the wall-like member. A striking tool according to claim 5 , wherein
The first body element and the second body element have overlapping regions overlapping each other,
The overlap area is
A flexible member disposed on either one of the first body element and the second body element;
An object which is formed on the other of the first body element and the second body element and on which the flexible member slides when the first body element and the second body element relatively reciprocate. An impact tool characterized by having a sliding area. A striking tool according to claim 11 , wherein
The impact tool, wherein the flexible member constitutes any one of the first covering area and the second covering area. A striking tool according to claim 11 or 12 , wherein
The impact tool according to claim 1, wherein the flexible member is configured to the second body element. An impacting tool according to any one of claims 11 to 13 , characterized in that
When assembling the first body element and the second body element, the flexible member is configured to be elastically deformable by the first body element or the second body element in which the sliding region is formed. A striking tool characterized by being An impact tool according to any one of claims 11 to 14 , wherein
The impact tool according to claim 1, wherein the flexible member is integrally molded with any one of the first body element and the second body element in the overlap region.

Images