JP2020011335A - Electric power tool - Google Patents

Abstract

To improve safety at the time of attaching and detaching an electricity supply body.SOLUTION: The electric power tool comprises: a motor; a housing for housing the motor; a switch lever which slides with respect to the housing, is operated to actuate and stop the motor and slides between an ON position where the motor is actuated and an OFF position where the motor is stopped; an energizing member that energizes the switch lever to the OFF position side; and a releasing member. The housing has a main body engagement part for locking the switch lever at the ON position and a power source connection part which an electric power supply body for supplying electric power to the motor is attached to and detached from. The switch lever has a lever engagement part which engages with the main body engagement part, and the releasing member releases lock of the switching lever when the electric power supply body is detached from the electric power source connection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power tool, and more specifically, to a power tool to and from which a power supply for supplying power to a motor is attached and detached.

  A battery pack is attached to the rear end of the electric tool described in Patent Document 1 below. The power tool includes a main body case, a switch, a switch lever, a detection rod, a first spring, and a second spring. The switch lever slides forward and backward with respect to the main body case and tilts inward and outward of the main body case. When the switch lever is located on the front side, the switch is ON, and when the switch lever is located on the rear side, the switch is OFF. The front position of the switch lever is the ON position, and the rear position of the switch lever is the OFF position. The first spring biases the switch lever rearward. The detection rod slides back and forth with respect to the main body case. The second spring biases the detection rod rearward. When the battery pack is attached to the power tool, the detection rod slides forward by being pushed forward by the battery pack. When the battery pack is removed from the power tool, the detection rod slides rearward by the second spring. When the switch lever is slid to the ON position and tilted inward with the battery pack attached to the power tool, the switch lever is engaged with the front end of the detection rod. When the switch lever is engaged with the detection rod, the switch lever remains at the ON position even if the hand is released from the switch lever. Thus, the switch lever is locked at the ON position by the detection rod.

  In this power tool, since the switch lever is engaged with the detection rod, there is a possibility that the engagement between the detection rod and the switch lever is not released when the battery pack is removed.

Japanese Patent No. 3853590

  An object of the present invention is to improve safety when attaching and detaching a power supply.

  A power tool according to the present invention includes a motor, a housing that houses the motor, and an ON position that slides with respect to the housing and is operated to operate and stop the motor to operate the motor. A switch lever that slides between an OFF position to be stopped, a biasing member that biases the switch lever toward the OFF position, and a release member, wherein the housing locks the switch lever at the ON position. And a power connection for attaching and detaching a power supply for supplying electric power to the motor, wherein the switch lever engages with the body engagement portion. A release unit that releases the lock of the switch lever when the power supply unit is removed from the power supply connection unit.

  ADVANTAGE OF THE INVENTION According to the electric tool of this invention, the safety at the time of attachment / detachment of a power supply body can be improved.

FIG. 2 is a sectional view of the power tool according to the first embodiment of the present invention as viewed from the left side. The figure which looked at the same electric tool from the upper side. FIG. 4 is a diagram of a main part of the power tool as viewed from above, in a state where the power tool is partially cut away. FIG. 4 is a diagram of a main part of the power tool as viewed from above, showing a state where a switch lever is removed. Sectional drawing of the principal part of the AA line of FIG. Sectional drawing of the BB line of FIG. Sectional drawing of the CC line of FIG. Sectional drawing of the DD line of FIG. The figure which looked at the same electric tool from the back side. The figure which looked at the switch link of the same electric tool from the left side. The figure which looked at the same switch link from the upper part. The figure which looked at the release rod of the electric tool from the left side. The figure which looked at the same release rod from the upper side. The figure which looked at the principal part of the power cord connected to the same electric tool from the upper side. Sectional drawing which looked at the principal part of the same power cord from the upper side. The figure which looked at the same power cord from the end face. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. FIG. 9 is a cross-sectional view of a main part of the power tool according to the second embodiment of the present invention, showing a state where a battery pack is removed from the power tool. FIG. 4 is a cross-sectional view of a main part of the power tool, showing a state where a battery pack is attached to the power tool. The figure which looked at the electric tool in the third embodiment of the present invention from the upper part. Sectional drawing which looked at the electric power tool from the left side. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. The principal part sectional view of the electric tool in the fourth embodiment of the present invention. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the same electric tool. Sectional drawing of the principal part of the electric power tool in 5th Embodiment of this invention. Sectional drawing of the principal part of the same electric tool.

<First embodiment>
The power tool of the present embodiment is a portable power tool. Typically, a power tool is a multi-purpose tool that can easily replace a polishing tool (sander) for polishing an object, a grinding tool (grinder) for grinding an object, a cutting tool for cutting an object, and a tip tool. There are tools, cutting tools for cutting an object, and a stirrer for stirring an object. Examples of the polishing tool include a belt sander, a disk sander, and a polisher. As a grinding tool, for example, there is a disk grinder. Examples of the cutting tool include an electric plane, an electric trimmer, an electric chisel, and a router. Examples of the cutting tool include a reciprocating saw and a jigsaw. In addition, an impact driver, an impact wrench, a drill, or the like may be used.

  1 to 20 show the power tool of the present embodiment. 1 and 2, the direction indicated by arrow X1 is the left side, the direction indicated by arrow X2 is the right side, the direction indicated by arrow Y1 is the front side, the direction indicated by arrow Y2 is the rear side, and the direction indicated by arrow Z1 is the direction indicated by arrow Z1. The direction indicated by arrow Z2 is the lower side.

  The power tool according to the present embodiment is a belt sander. The user performs the polishing operation while holding the power tool by hand. The power tool includes a main body 10 and a power cord 12. 1 to 9 show the main body 10. FIGS. 14 to 16 show the power cord 12. The main body 10 has a shape that is long in the front-rear direction as a whole. The power cord 12 is attached to and detached from the rear end of the main body 10. The power cord 12 is a power supply for supplying power to the main body 10.

  The power cord 12 has a first end and a second end (not shown). The power cord 12 has a connector 14 at a first end and a plug (not shown) at a second end. The connector 14 is connected to the main body 10. The connector 14 is cylindrical. The connector 14 has a pair of female terminals 16. The connector 14 has an engaging projection 18 on the outer peripheral surface for retaining. The retaining projection 18 for retaining protrudes in the radial direction of the connector 14. A pair of engaging projections 18 for retaining are provided to face each other by 180 degrees. The plug is inserted into a power outlet (not shown).

<Housing 20>
The main body 10 includes a hollow housing 20. The housing 20 has a shape that is long in the front-rear direction. The housing 20 has a gear housing 22 and a grip 24. The gear housing 22 is a front part of the housing 20. The gear housing 22 is open to the left. The grip 24 is located on the rear side of the gear housing 22. The grip 24 occupies most of the housing 20. The grip 24 has a tubular shape extending in the front-rear direction. The user can perform the polishing operation while holding the holding portion 24.

  As shown in FIG. 1 and FIGS. 6 to 8, the grip 24 has a first storage chamber 26 and a second storage chamber 28. The second storage room 28 is located above the first storage room 26. The first storage chamber 26 occupies most of the internal space of the grip 24. The second storage room 28 is smaller than the first storage room 26. The first storage chamber 26 and the second storage chamber 28 both extend in the front-rear direction.

<Power supply connection part 30>
The housing 20 has a power connection 30 to which the connector 14 of the power cord 12 is detachably attached. The power supply connection part 30 is located at the rear end of the main body 10 and at the rear end of the housing 20. The power supply connection portion 30 is a concave portion having a circular cross section. The power supply connection portion 30 is open at the rear end surface of the housing 20 and extends forward. The connector 14 is inserted into the power connection unit 30 from the rear side to the front side. The power supply connection portion 30 has a shape corresponding to the connector 14, and specifically has a circular cross section.

  The main body 10 includes a terminal holder 32 at the innermost part of the power supply connection part 30 of the housing 20. The terminal holder 32 is rotatably supported by the housing 20. The terminal holder 32 can rotate around an axis along the front-rear direction with respect to the housing 20. A pair of male terminals 34 are attached to the terminal holder 32. The pair of male terminals 34 can rotate with respect to the housing 20 together with the terminal holder 32.

  The power supply connection portion 30 has an engagement groove 36 for preventing the power supply connection portion 30 from coming off. A pair of engagement grooves 36 for retaining are provided to face each other by 180 degrees. The engagement groove 36 for retaining extends in a range of approximately 90 degrees along the circumferential direction. The pair of retaining projections 18 of the connector 14 engage with the pair of retaining engagement grooves 36, respectively. When the connector 14 is inserted into the power supply connection portion 30, the female terminal 16 is connected to the male terminal 34, and the retaining projection 18 is engaged with the retaining groove 36. Combine. When the connector 14 is rotated by 90 degrees around the center line of the connector 14 in this state, the connector 14 rotates together with the male terminal 34 and the retaining projection 18 is engaged with the retaining groove 36. Slide. By rotating the connector 14 by 90 degrees in this manner, the connector 14 is prevented from being pulled out from the power supply connection portion 30 to the rear side. When the connector 14 is connected to the power supply connection section 30, power can be supplied to the main body 10 via the power cord 12.

<Locking groove 40 (main body engaging portion)>
As shown in FIGS. 1, 6, and 7, the housing 20 has a pair of left and right guide walls 38 on the upper surface. The guide wall 38 is located at the front end of the grip 24 of the housing 20. The guide wall 38 protrudes upward from the upper surface of the housing 20. The housing 20 has a locking engagement groove 40 as a main body engagement portion, a first through hole 42, and a second through hole 44 on the upper surface. The locking engagement groove 40, the first through hole 42, and the second through hole 44 are located between the left and right guide walls 38. The lock engagement groove 40 is open upward. The locking engagement groove 40 extends linearly along the left-right direction.

  The first through-hole 42 and the second through-hole 44 vertically pass through the upper surface of the housing 20. The first through-hole 42 and the second through-hole 44 vertically communicate the second storage chamber 28 and the outside of the housing 20. As shown in FIG. 4, the first through hole 42 has a long shape along the front-back direction. The engagement groove 40 for locking is divided into right and left by the first through hole 42. The locking engagement grooves 40 are located on the left and right sides of the intermediate portion of the first through hole 42 in the front-rear direction. The second through-hole 44 is located at a position rearward of the locking engagement groove 40 and the first through-hole 42.

<Belt 50>
The main body 10 includes a belt 50 for polishing an object to be polished. The belt 50 is endless. The belt 50 is located on the front side of the housing 20. The width direction of the belt 50 is the left-right direction. The circling direction of the belt 50 is the front-back direction.

<Drive unit>
The main body 10 includes a driving unit for driving the belt 50. The drive section includes a motor 52 as a drive source, and a transmission mechanism for transmitting rotation of the motor 52 to the belt 50. The motor 52 has a rotation axis extending in the front-rear direction. The motor 52 is accommodated in a front part of the grip part 24 of the housing 20. The motor 52 is housed in the first housing chamber 26 of the gripper 24.

  The transmission mechanism is located on the front side of the motor 52. The transmission mechanism is housed in the front part of the housing 20. The transmission mechanism includes first and second gears 54 and 56 and first and second pulleys 58 and 60. The first gear 54 is attached to the motor shaft 62. The first gear 54 is located at a boundary between the gear housing 22 and the grip 24 of the housing 20. The second gear 56 meshes with the first gear 54. The second gear 56 is housed in the gear housing 22 of the housing 20. Each of the first and second pulleys 58 and 60 has a rotation axis extending along the left-right direction. The first pulley 58 is located on the left side of the second gear 56.

  The first pulley 58 is located coaxially with the second gear 56 and rotates integrally with the second gear 56. The first and second gears 54 and 56 reduce the rotation of the motor 52 and transmit the rotation to the first pulley 58. The second pulley 60 is located at the front end of the main body 10. The second pulley 60 is located away from the first pulley 58 on the front side. The diameter of the second pulley 60 is smaller than the diameter of the first pulley 58. The belt 50 is looped between a first pulley 58 and a second pulley 60. The main body 10 has a belt holder 64. The belt holder 64 is attached to the gear housing 22 of the housing 20. The belt holder 64 extends forward from the gear housing 22 of the housing 20. A second pulley 60 is attached to the front end of the belt holder 64.

<Switch 70>
The main body 10 includes a switch 70 for operating and stopping the motor 52. The switch 70 is housed in the first housing chamber 26 of the housing 20. The switch 70 is located behind the motor 52. The switch 70 has a switching key 72 on the upper surface. The key 72 slides back and forth. When the key 72 is located at the rear position, the switch 70 is turned on and the motor 52 operates. When the key 72 is located at the front position, the switch 70 is turned off and the motor 52 stops. FIG. 1 shows a state in which the switch 70 is off.

<Switch lever 74>
The main body 10 has a switch lever 74. The user operates the switch lever 74 to switch the switch 70 on and off. The switch lever 74 has a shape that is long in the front-rear direction in plan view. The switch lever 74 is located above the upper surface of the housing 20. Specifically, the switch lever 74 is located on the upper surface of the front part of the grip part 24 of the housing 20. The switch lever 74 is located above the motor 52 and slightly ahead of the motor 52.

  The switch lever 74 slides back and forth while sliding on the upper surface of the housing 20. The switch lever 74 slides between an ON position for operating the motor 52 and an OFF position for stopping the motor 52. The ON position is a rear position, and the OFF position is a front position. When the user pulls the switch lever 74 rearward, the switch 70 turns ON. 1 to 3 show a state where the switch lever 74 is located at the OFF position.

  The switch lever 74 is located between the left and right guide walls 38. When the switch lever 74 slides back and forth, the left and right side surfaces of the switch lever 74 are guided by the left and right guide walls 38. Since the guide wall 38 protrudes upward from the upper surface of the housing 20, the guide wall 38 protects the switch lever 74.

  The switch lever 74 has a locking engagement plate 76 as a lever engagement portion. The engagement plate 76 extends in the left-right direction. The engagement plate 76 is formed integrally with the lower surface of the front part of the switch lever 74. The engagement plate 76 protrudes downward from the lower surface of the switch lever 74. The engagement plate 76 is engageable with the locking engagement groove 40 of the housing 20. When the engagement plate 76 engages with the locking engagement groove 40 of the housing 20, the switch lever 74 is locked at the ON position. The engagement plate 76 of the switch lever 74 and the lock engagement groove 40 of the housing 20 are a lock mechanism for locking the switch lever 74 at the ON position.

  The switch lever 74 tilts up and down in the ON position. In other words, the switch lever 74 is tilted around the left-right axis at the ON position. The switch lever 74 has a concave portion 78 for support at an intermediate portion of the lower surface in the front-rear direction. The supporting recess 78 is located on the front side of the locking engagement plate 76. The switch lever 74 tilts up and down with the support recess 78 as a fulcrum. The switch lever 74 is brought into a locked posture and an unlocked posture by tilting. The locking posture is a posture in which the engagement plate 76 of the switch lever 74 is engaged with the locking engagement groove 40 of the housing 20. The unlock position is a position in which the engagement plate 76 of the switch lever 74 is disengaged upward from the locking engagement groove 40 of the housing 20. The unlocking posture is a posture serving as a reference for the switch lever 74. The locked posture is a posture in which the front part of the switch lever 74 is located below and the rear part of the switch lever 74 is located above the unlocked posture. The lock posture is a posture leaning forward more than the unlock posture.

  In the locked position, the engagement plate 76 of the switch lever 74 is fitted into the locking engagement groove 40 of the housing 20, and the rear portion of the switch lever 74 is lifted upward from the upper surface of the housing 20. The user can automatically bring the switch lever 74 into the locked position by pulling the switch lever 74 from the OFF position to the ON position while pressing the front part of the switch lever 74 downward. The user can return the switch lever 74 from the locked position to the unlocked position by pushing the rear part of the switch lever 74 floating from the upper surface of the housing 20 downward.

<Switch link 80>
The main body 10 has a switch link 80. The switch link 80 has a rod shape that is long in the front-rear direction. The switch link 80 connects the switch lever 74 and the key 72 of the switch 70. The switch link 80 is a member for linking the switch lever 74 and the key 72 of the switch 70. FIGS. 10 and 11 show the switch link 80. The switch link 80 has a main portion 82 occupying most of the entire length. The main part 82 has a plate-like shape whose vertical direction is the thickness direction, and the width of the main part 82 is substantially constant.

  The switch link 80 has an upper section 84 on the front side of the main section 82. The upper section 84 is located at the front end of the switch link 80. The upper section 84 is located one step above the main section 82. The upper portion 84 has a portion bulging to the left from the main portion 82. Since the upper portion 84 has a bulging portion, the upper portion 84 is wider than the main portion 82 and is eccentric to the left. The switch link 80 has a supporting projection 86 on the upper surface of the upper section 84. The support protrusion 86 protrudes upward from the upper surface of the upper step 84. The supporting projection 86 is located on the left side of the upper step 84.

  The switch link 80 has a connecting projection 88 on the lower surface of the rear end of the main portion 82. The connecting projection 88 projects downward from the lower surface of the rear end of the main portion 82. An engagement recess 90 for connection is formed in the projection 88 for connection. The engagement recess 90 for connection is open to the lower side. The switch link 80 has a projection 92 for receiving a spring on the rear side of the main portion 82. The spring receiving protrusion 92 protrudes rearward from the rear end of the main portion 82. The projection 92 for receiving a spring has a columnar shape.

  The switch link 80 is housed in the second housing chamber 28 of the grip portion 24 of the housing 20. The switch link 80 slides substantially horizontally in the second accommodation room 28 along the front-rear direction. The switch link 80 is located in the right half of the second accommodation room 28. The switch link 80 is eccentric to the right with respect to the center line of the housing 20. The upper portion 84 of the switch link 80 is located below the switch lever 74. As shown in FIG. 7, the supporting projection 86 of the switch link 80 projects upward through the second through hole 44 on the upper surface of the housing 20. The support projection 86 is located above the center line of the housing 20. A supporting projection 86 supports the switch lever 74. The support projection 86 of the switch link 80 enters the support recess 78 of the switch lever 74 from below. The switch lever 74 tilts up and down with the supporting projection 86 as a fulcrum.

  The connecting projection 88 of the switch link 80 is located above the switch 70. The connecting projection 88 has entered the first storage chamber 26. A key 72 of the switch 70 is engaged with an engagement recess 90 for connection of the switch link 80. The key 72 of the switch 70 and the switch lever 74 are connected by a switch link 80. The key 72 of the switch 70, the switch lever 74, and the switch link 80 are integrally slid in the front-back direction. The main body 10 includes a first coil spring 94 for urging the switch link 80 forward. The first coil spring 94 is an urging member that urges the switch lever 74 to the OFF position. The first coil spring 94 is located on the rear side of the switch link 80. When the switch link 80 slides rearward, the first coil spring 94 compresses. A spring receiving projection 92 of the switch link 80 enters inside the first coil spring 94.

<Release link 100 (release member)>
The main body 10 includes a release link 100 as a release member. The release link 100 is a member for releasing the lock of the switch lever 74. The release link 100 has a rod shape that is long in the front-rear direction. The release link 100 extends from a position below the switch lever 74 to the power supply connection unit 30. FIGS. 12 and 13 show the release link 100. FIG. The release link 100 has a main portion 102 occupying most of the entire length. The main part 102 has a plate-like shape with the vertical direction as the thickness direction, and the width of the main part 102 is substantially constant. The release link 100 has a wide portion 104 on the front side of the main portion 102. The wide portion 104 bulges to the right with respect to the main portion 102.

  The release link 100 has a projection 106 for release on the upper surface of the wide portion 104. The release projection 106 is located on the right side of the wide portion 104. The release projection 106 has a substantially triangular shape when viewed from the side as shown in FIG. The release projection 106 has a first pushing part 108 and a second pushing part 110. The first pushing portion 108 is located on the rear side with respect to the top 112 of the release projection 106. The first pushing portion 108 is a rear surface of the releasing projection 106. The second pushing portion 110 is located on the front side with respect to the top 112 of the release projection 106. The second pushing portion 110 is a front surface of the release projection 106. The first pushing part 108 and the second pushing part 110 are adjacent to each other through the top 112 of the release projection 106.

  The first pushing portion 108 is an inclined surface inclined with respect to the front-back direction. More specifically, the first pushing portion 108 is an inclined surface that descends rearward from the top 112 of the release projection 106. The second pressing portion 110 is an inclined surface inclined with respect to the front-rear direction. The direction of inclination of the second pushing part 110 is opposite to the direction of inclination of the first pushing part 108. More specifically, the second pressing portion 110 is an inclined surface that is lowered from the top 112 of the release projection 106 toward the front. The first pushing portion 108 and the second pushing portion 110 have the same position in the left-right direction. The first pushing part 108 and the second pushing part 110 are located on the same line along the front-back direction. When the release link 100 slides rearward, the first pusher 108 pushes the engagement plate 76 of the switch lever 74 in the locked position rearward. When the release link 100 slides forward, the second pusher 110 pushes the engagement plate 76 of the switch lever 74 in the locked position forward. In the present embodiment, the engagement plate 76 of the switch lever 74 is a receiving portion pushed by the release link 100.

  The release link 100 has a projection 114 for receiving a spring at the rear of the lower surface of the main part 102. The projection 114 for receiving a spring extends toward the front side. The projection 114 for receiving a spring has a columnar shape. The release link 100 has a pressure receiving portion 116 at the rear end of the main portion 102. The pressure receiving portion 116 is plate-shaped. The pressure receiving portion 116 extends substantially vertically downward from the rear end of the main portion 102. The rear surface of the pressure receiving portion 116 is a plane orthogonal to the front-rear direction.

  The release link 100 is housed in the second housing chamber 28 of the grip portion 24 of the housing 20. The release link 100 slides substantially horizontally in the second accommodation room 28 in the front-rear direction. The release link 100 is located in the left half of the second storage room 28. The release link 100 is eccentric to the left with respect to the center line of the housing 20. As shown in FIG. 8, the release link 100 and the switch link 80 are arranged in parallel on the left and right. The release projection 106 of the release link 100 is located below the switch lever 74. The release protrusion 106 is located on the front side of the support protrusion 86 of the switch link 80. As shown in FIG. 6, the release projection 106 projects upward through the first through hole 42 on the upper surface of the housing 20.

  In a state where the connector 14 of the power cord 12 is not connected to the main body 10 as shown in FIG. 1, the second pushing portion 110 of the release projection 106 is slightly engaged with the locking engagement groove 40 of the housing 20. Is located on the rear side. The main body 10 includes a second coil spring 118 for urging the release link 100 rearward. The second coil spring 118 is an urging member that urges the release link 100 rearward. The second coil spring 118 is located on the front side of the spring receiving protrusion 114 of the release link 100. The spring receiving protrusion 114 of the release link 100 enters the inside of the second coil spring 118. When the release link 100 slides forward, the second coil spring 118 is compressed. The lower portion of the pressure receiving portion 116 of the release link 100 projects inside the power supply connection portion 30 of the housing 20 as shown in FIGS. 1 and 9. The pressure receiving portion 116 of the release link 100 is separated upward from the male terminal 34.

  Next, the operation of the power tool will be described. 17 to 20 show cross sections of main parts of the power tool. 17 to 20, illustration of the motor 52 and the like is omitted. FIG. 17 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 18 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is locked at the ON position. FIG. 19 shows a state in which the connector 14 is connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 20 shows a state where the connector 14 is connected to the main body 10 and a state where the switch lever 74 is locked at the ON position.

  The state of the power tool shown in FIG. 17 will be described in detail. When the switch lever 74 is at the OFF position, the switch lever 74 is in the unlocked posture. The engagement plate 76 of the switch lever 74 is disengaged from the locking engagement groove 40 of the housing 20 and is located forward of the locking engagement groove 40. The engagement plate 76 of the switch lever 74 and the rear end of the switch lever 74 are in contact with the upper surface of the housing 20. The switch link 80 is urged forward by a first coil spring 94. Since the upper portion 84 of the switch link 80 is in contact with the housing 20, the switch link 80 cannot move forward. The release link 100 is urged rearward by the second coil spring 118. Since the pressure receiving portion 116 of the release link 100 is in contact with the housing 20, the release link 100 cannot move rearward. The release projection 106 of the release link 100 is located on the rear side of the locking engagement groove 40 of the housing 20.

  Normally, the connector 14 of the power cord 12 is connected to the main body 10 shown in FIG. When the connector 14 is connected to the main body 10 in the state shown in FIG. 17, the main body 10 is in a state as shown in FIG. The switch lever 74 remains in the state shown in FIG. 17 and is located at the OFF position. When the connector 14 is inserted into the power supply connection part 30, the lower part of the pressure receiving part 116 is pushed forward by the end face of the connector 14. When the pressure receiving portion 116 is pushed forward by the connector 14, the release link 100 slides forward while compressing the second coil spring 118. The release protrusion 106 of the release link 100 passes through the position of the lock engagement groove 40 of the housing 20 and is located on the front side of the lock engagement groove 40.

  When performing the polishing operation, the user pulls the switch lever 74 forward from the state of FIG. 19 to position the switch lever 74 at the ON position and locks the switch lever 74 at the ON position. FIG. 20 shows a state in which the switch lever 74 is locked at the ON position. The switch lever 74 is in the locked position. The engagement plate 76 of the switch lever 74 is engaged with the locking engagement groove 40 of the housing 20, and the rear end of the switch lever 74 is lifted upward from the upper surface of the housing 20. As the switch lever 74 retreats, the switch link 80 slides rearward while compressing the first coil spring 94, and the switch is turned ON. The release projection 106 of the release link 100 is located on the front side of the engagement plate 76 of the switch lever 74.

  In the state shown in FIG. 20, if the user disconnects the connector 14 from the main body 10 while the switch lever 74 is locked in the ON position, the release link 100 releases the lock of the switch lever 74. When the connector 14 is pulled rearward from the main body 10, the release link 100 slides rearward by the second coil spring 118. The release link 100 slides rearward in conjunction with the backward movement of the connector 14. When the release link 100 is retracted, the first pushing portion 108 of the release projection 106 comes into contact with the engagement plate 76 of the switch lever 74 to push up the engagement plate 76. The engagement plate 76 is pushed upward by the first pushing portion 108 and is disengaged upward from the engagement groove 40 for locking. When the engagement plate 76 is disengaged from the locking engagement groove 40, the switch lever 74 and the switch link 80 slide forward by the first coil spring 94 and automatically return to the OFF position, and the switch 70 is automatically turned OFF. Become. The main body 10 returns to the state shown in FIG. By thus removing the connector 14 from the main body 10, the lock of the switch lever 74 is automatically released, and the switch lever 74 returns to the OFF position.

  On the other hand, if the user pulls the switch lever 74 rearward from the state of FIG. 17 and locks the switch lever 74 to the ON position, the main body 10 will be in the state shown in FIG. Since the connector 14 is not connected to the main body 10, the release link 100 is located on the rear side, and the release projection 106 is located on the rear side of the engagement plate 76. If the user connects the connector 14 to the main body 10 in the state shown in FIG. 18, the release link 100 is pushed by the connector 14 and moves forward. As the release link 100 moves forward, the second pushing portion 110 of the release projection 106 pushes up the engagement plate 76, and the lock of the switch lever 74 is automatically released.

  As described above, in the power tool according to the present embodiment, the engagement plate 76 of the switch lever 74 is engaged with the locking engagement groove 40 of the housing 20. Therefore, the locked state of the switch lever 74 is stabilized, and the switch lever 74 is stably locked at the ON position. When the connector 14 is pulled out of the main body 10 in a state where the switch lever 74 is locked at the ON position, the first pushing portion 108 of the release link 100 pushes up the engagement plate 76 of the switch lever 74 so that the switch lever 74 is released. unlock. Therefore, the safety of the power tool when attaching and detaching the connector 14 is improved. Further, when the connector 14 is connected to the main body 10 in a state where the switch lever 74 is locked at the ON position, the second push portion 110 of the release link 100 pushes up the engagement plate 76 of the switch lever 74 to push the switch lever 74. Unlock. Therefore, the safety of the power tool when attaching and detaching the connector 14 is improved.

  Since the first push portion 108 and the second push portion 110 abut against the engagement plate 76 of the switch lever 74 and directly push up the engagement plate 76, the engagement plate 76 can be easily removed from the locking engagement groove 40. Further, since the first pushing portion 108 and the second pushing portion 110 are adjacent to each other in the front and rear and are close to each other, the stroke of the release link 100 in the front and rear direction can be short. Since the release link 100 and the switch link 80 are arranged side by side, the sliding operation of the release link 100 hardly affects the switch link 80, and the sliding operation of the switch link 80 hardly affects the release link 100. Therefore, the release link 100 and the switch link 80 can slide smoothly. Since the sliding direction of the switch lever 74 and the sliding direction of the release link 100 are respectively the front-back direction and the same direction, the lock of the switch lever 74 can be easily released by the release link 100.

<Second embodiment>
Next, an electric tool according to a second embodiment of the present invention will be described. However, a detailed description of the same configuration as in the first embodiment will be omitted. The power supply of the power tool according to the second embodiment is a battery pack 120. A battery pack 120 is attached to the power supply connection portion 30 of the main body 10. A power tool according to the second embodiment is shown in FIGS. FIG. 21 shows a state in which the battery pack 120 has been removed from the power supply connection unit 30. The battery pack 120 is attached to the power supply connection unit 30 while sliding. The sliding direction of the battery pack 120 is a direction inclined in the up-down direction with respect to the front-back direction. However, the mounting direction of the battery pack 120 is arbitrary. When the battery pack 120 is attached to the power supply connection unit 30, the battery pack 120 gradually descends diagonally forward. When the battery pack 120 is detached from the power supply connection unit 30, the battery pack 120 gradually rises obliquely rearward.

  The pressure receiving portion 116 of the release link 100 projects rearward from the power supply connection portion 30. When the battery pack 120 is attached to the power connection unit 30, the pressure receiving portion 116 of the release link 100 is pushed forward by the battery pack 120, and the release link 100 slides forward. When the battery pack 120 is detached from the power supply connection section 30, the release link 100 slides rearward by the second coil spring 118 and returns to the original position.

<Third embodiment>
Next, a power tool according to a third embodiment of the present invention will be described. However, a detailed description of the same configuration as the above embodiment will be omitted. The power tool according to the third embodiment is a disk grinder. A power tool according to a third embodiment is shown in FIGS. As shown in FIGS. 23 and 24, the power tool includes a disk 130. The disk 130 has a vertical rotation axis. The transmission mechanism includes a first gear 54 and a second gear 56. The rotation of the motor 52 is transmitted to the disk 130 by the first gear 54 and the second gear 56.

  The ON and OFF positions of the switch 70 are opposite to those of the switch 70 of the above embodiment. When the key 72 is located at the rear position, the switch 70 is turned off, and when the key 72 is located at the front position, the switch 70 is turned on. The ON position of the switch lever 74 is the front position, and the OFF position of the switch lever 74 is the rear position. FIG. 24 shows a state where the switch 70 is off. The first coil spring 94 biases the switch link 80 rearward.

  The operation of the power tool according to the present embodiment will be described. FIGS. 25 to 28 show cross sections of main parts of the power tool. 25 to 28, illustration of the motor 52 and the like is omitted. FIG. 25 shows a state in which the connector 14 is not connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 26 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is locked at the ON position. FIG. 27 shows a state where the connector 14 is connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 28 shows a state where the connector 14 is connected to the main body 10 and a state where the switch lever 74 is locked at the ON position.

  When the switch lever 74 is in the OFF position as shown in FIG. 25, the supporting projection 86 of the switch link 80 is in contact with the rear end of the wall surface of the second through hole 44 of the housing 20. The rear end of the wall surface of the second through hole 44 of the housing 20 prevents the switch link 80 from moving rearward. The engagement plate 76 of the switch lever 74 is located behind the locking engagement groove 40 of the housing 20.

  When the connector 14 is connected to the main body 10 in the state shown in FIG. 25, the main body 10 is in a state as shown in FIG. The release link 100 is pushed by the connector 14 and moves forward. The release projection 106 of the release link 100 is located on the front side of the locking engagement groove 40. By pressing the switch lever 74 forward from the state of FIG. 27, the switch lever 74 can be locked at the ON position. FIG. 28 shows a state in which the switch lever 74 is locked at the ON position.

  In the state shown in FIG. 28, if the user disconnects the connector 14 from the main body 10 while the switch lever 74 is locked at the ON position, the release link 100 releases the lock of the switch lever 74. When the connector 14 is removed from the main body 10, the release link 100 slides rearward by the second coil spring 118. As the release link 100 retreats, the first pushing portion 108 of the release projection 106 pushes up the engagement plate 76 of the switch lever 74, and the engagement plate 76 is disengaged upward from the locking engagement groove 40. When the engagement plate 76 is disengaged from the locking engagement groove 40, the switch lever 74 and the switch link 80 are slid rearward by the first coil spring 94 and automatically returned to the OFF position, and the switch 70 is automatically turned off. Becomes The main body 10 returns to the state shown in FIG.

  On the other hand, if the user pushes the switch lever 74 to the front side to lock the switch lever 74 to the ON position from the state of FIG. 25, the main body 10 changes to the state shown in FIG. If the user connects the connector 14 to the main body 10 in the state shown in FIG. 26, the release link 100 is pushed by the connector 14 and moves forward. As the release link 100 moves forward, the second pushing portion 110 of the release projection 106 pushes up the engagement plate 76, and the lock of the switch lever 74 is automatically released.

<Fourth embodiment>
Next, a power tool according to a fourth embodiment of the present invention will be described. However, a detailed description of the same configuration as the above embodiment will be omitted. A power tool according to a fourth embodiment is shown in FIGS. 29 to 31, illustration of the motor 52 and the like is omitted. The power tool according to the present embodiment is different from the power tool according to the third embodiment in the shape of the protrusion 106 for releasing the release link 100. The release projection 106 of the release link 100 has a first push portion 108 and no second push portion 110. The front surface 140 of the release projection 106 is not an inclined surface but a vertical surface.

  FIG. 29 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 30 shows a state where the connector 14 is connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 31 shows a state where the connector 14 is connected to the main body 10 and a state where the switch lever 74 is locked at the ON position.

  The locking engagement groove 40 of the housing 20 is divided right and left by a first through hole 42. In a state where the connector 14 is not connected to the main body 10 as shown in FIG. 29, the release protrusion 106 of the release link 100 is located between the locking engagement grooves 40 divided into right and left. . The engagement plate 76 of the switch lever 74 cannot be engaged with the locking engagement groove 40 by the release projection 106 of the release link 100. When the connector 14 is connected to the main body 10 as shown in FIG. 30, the release link 100 is pushed forward by the connector 14, and the release projection 106 of the release link 100 is positioned forward of the engagement groove 40 for locking. I do. Therefore, as shown in FIG. 31, the engagement plate 76 of the switch lever 74 can be engaged with the engagement groove 40 for locking, and the switch lever 74 can be locked at the ON position.

  In the state shown in FIG. 31, if the user unplugs the connector 14 from the main body 10, the release link 100 retreats. The first push portion 108 of the release projection 106 pushes up the engagement plate 76 of the switch lever 74, and the engagement plate 76 is disengaged from the lock engagement groove 40. The switch lever 74 slides rearward and automatically returns to the OFF position.

<Fifth embodiment>
Next, a power tool according to a fifth embodiment of the present invention will be described. However, a detailed description of the same configuration as the above embodiment will be omitted. A power tool according to the fifth embodiment is shown in FIGS. 32 and 33, illustration of the motor 52 and the like is omitted. FIG. 32 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is in the OFF position. FIG. 33 shows a state where the connector 14 is not connected to the main body 10 and the switch lever 74 is locked at the ON position.

  When the connector 14 is not connected to the main body 10 as shown in FIG. 32, the release projection 106 of the release link 100 is located rearward of the locking engagement groove 40. Therefore, when the connector 14 is not connected to the main body 10 as shown in FIG. 33, the engagement plate 76 of the switch lever 74 can be engaged with the engagement groove 40 for locking, and the switch lever 74 is set to the ON position. Can be locked. In this state, the user cannot connect the connector 14 to the main body 10. Even if the connector 14 pushes the pressure receiving portion 116 of the release link 100 forward, the front surface 140 of the release projection 106 of the release link 100 comes into contact with the engagement plate 76 of the switch lever 74, and the release link 100 cannot move forward. . Therefore, the user cannot connect the connector 14 to the main body 10. When the user returns the switch lever 74 to the OFF position, the user can connect the connector 14 to the main body 10.

  In the above-described embodiment, the engagement plate 76 of the switch lever 74 is the receiving portion pressed by the release link 100. However, a portion other than the engagement plate 76 may be the receiving portion. The first pressing portion 108 and the second pressing portion 110 may press the same receiving portion, or may press different receiving portions. In the above embodiment, the first pusher 108 and the second pusher 110 are arranged in front and rear, but the first pusher 108 and the second pusher 110 may be displaced from each other in the left-right direction.

  In the above-described embodiment, the first pressing portion 108 and the second pressing portion 110 are each an inclined surface, but the receiving portion may be an inclined surface. The pushing part and the receiving part may each be an inclined surface.

  In the above embodiment, the housing 20 has the locking engagement groove 40 which is an engagement concave portion, and the switch lever 74 has the engagement plate 76 which is an engagement convex portion. The switch lever 74 may have a mating projection, and the switch lever 74 may have an engagement recess.

10 Body 10
12 Power cord (power supply)
DESCRIPTION OF SYMBOLS 14 Connector 16 Female side terminal 18 Engagement convex part for retaining 20 Housing 22 Gear accommodating part 24 Grip part 26 First accommodating chamber 28 Second accommodating chamber 30 Power supply connection part 32 Terminal holder 34 Male terminal 36 Disengagement prevention Engaging groove 38 guide wall 40 locking engaging groove 42 first through hole 44 second through hole 50 belt 52 motor 54 first gear 56 second gear 58 first pulley 60 second Pulley 62 Motor shaft 64 Belt holder 70 Switch 72 Key 74 Switch lever 76 Engagement plate (lever engagement part, receiving part)
78 Support recess 80 Switch link 82 Main part 84 Upper step 86 Support projection 88 Connection projection 90 Connection engagement recess 92 Spring receiving projection 94 First coil spring (biasing member)
100 Release link (release member)
102 Main part 104 Wide part 106 Projection for release (release part)
108 First pressing part 110 Second pressing part 112 Top part 114 Spring receiving part 116 Pressure receiving part 118 Second coil spring 120 Battery pack (power supply)
130 Disk 140 Front

Claims (5)

Motor and
A housing for housing the motor;
A switch lever that slides with respect to the housing, is operated to operate and stop the motor, and slides between an ON position for operating the motor and an OFF position for stopping the motor;
An urging member for urging the switch lever to the OFF position side;
A release member,
The housing has a main body engagement portion for locking the switch lever at an ON position, and a power supply connection portion to which a power supply for supplying power to the motor is attached and detached,
The switch lever has a lever engaging portion that engages with the main body engaging portion,
The power tool, wherein the release member releases the lock of the switch lever when the power supply is removed from the power supply connection portion. The release member slides with respect to the housing,
The release member slides in the first direction when the power supply is removed from the power supply connection portion,
The release member slides in a second direction opposite to the first direction when the power supply is attached to the power supply connection portion,
The release member has a pressing portion that presses the switch lever when the release member slides in the first direction, and the switch lever has a receiving portion that is pressed by the pressing portion of the release member,
At least one of the pressing portion and the receiving portion includes an inclined surface inclined with respect to a sliding direction of the release member,
The power tool according to claim 1, wherein the sliding of the release member in the first direction causes the pressing portion of the release member to push the receiving portion of the switch lever in the first direction to release the lock of the switch lever. . The switch lever is tilted with respect to the housing,
The switch lever, by tilting, a locked position in which the lever engaging portion is engaged with the main body engaging portion, and an unlocked position in which the lever engaging portion is disengaged from the main body engaging portion,
3. The slide lever according to claim 2, wherein, by the sliding of the release member in the first direction, the pressing portion of the release member pushes the receiving portion of the switch lever in the first direction, and the switch lever assumes the unlocked position. 4. Electric tool. The push portion is a first push portion, and the release member has a second push portion that pushes the receiving portion of the switch lever in the second direction when the release member slides in the second direction. ,
The first pressing portion includes an inclined surface that is inclined with respect to the sliding direction of the release member, and the second pressing portion includes a tilt direction of the first pressing portion with respect to the sliding direction of the release member. Including a slope inclined in the opposite direction,
The slide of the release member in the second direction causes the second pushing portion of the release member to push the receiving portion of the switch lever in the second direction, thereby bringing the switch lever into the unlock position. A power tool as described. The release member releases the lock of the switch lever when the power supply is removed from the power supply connection portion,
The power tool according to claim 1, wherein the release member releases the lock of the switch lever when the power supply is attached to the power supply connection portion.

Images