JP2019203567A - Motion conversion adapter and power tool with motion conversion adapter - Google Patents

Abstract

To provide a motion conversion adapter capable of suppressing generation of vibration and heat other than a targetted reciprocal linear motion.SOLUTION: A first clutch is connected to a first shaft and rotated in a circumferential direction, comprises a first protrusion which protrudes toward an axial front side, and includes a first pin hole. A second clutch comprises a second protrusion which protrudes toward an axial rear side, and reciprocates in an axial direction. The second protrusion is brought alternately into a state in contact with the first protrusion and a state not in contact with the first protrusion in a case where the first clutch is rotated in the circumferential direction. A first spring pushes a reciprocal linear motion body toward the axial rear side. A clutch pin is accommodated over the first pin hole and the second pin hole. A second spring pushes the clutch pin toward the axial front side. A sphere is held between the clutch pin and the reciprocal linear motion body in the axial direction and brought into line contact or point contact with the clutch pin and the reciprocal linear motion body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motion conversion adapter that converts rotational motion generated by a power tool into reciprocating linear motion, and a power tool with a motion conversion adapter that includes the motion conversion adapter.

  The electric drill driver includes a drill chuck. The electric impact driver includes a sleeve. The drill chuck and the sleeve rotate in the circumferential direction. Various tip tools such as a drill bid, a driver bid, a polishing bid, and a stirring bid can be attached to and detached from the drill chuck and the sleeve. Thereby, the electric drill driver and the electric impact driver can be used for various applications.

  There has been proposed a motion conversion adapter that converts a rotary motion generated by an electric drill driver or an electric impact driver into a reciprocating linear motion to expand the application of the electric tool. The motion conversion adapter described in Patent Document 1 is an example.

  In the motion conversion adapter described in Patent Document 1, the input shaft is attached to the driver chuck portion of the impact driver. The rotational motion of the input shaft is converted into a withdrawal motion by a motion conversion mechanism. The output shaft has a chuck portion. A tip tool is attached to the chuck portion (paragraph 0013). The tip tool is a scraper or the like (paragraph 0021).

Utility Model Registration No. 3117785

  In the conventional motion conversion adapter represented by the motion conversion adapter described in Patent Document 1, vibration and heat other than the intended reciprocating linear motion are likely to occur. For this reason, it becomes difficult for an operator to perform work with the motion conversion adapter, and problems such as the attached tip tool hitting an unintended tool are likely to occur.

  The present invention has been made in view of this problem. The problem to be solved by the present invention is to provide a motion conversion adapter that can suppress generation of vibration and heat other than the intended reciprocating linear motion.

  The present invention relates to a motion conversion adapter and a power tool with a motion conversion adapter. The motion conversion adapter includes a case, a rotary motion body, a reciprocating linear motion body, and a mounting portion. The rotary motion body includes a first shaft and a first clutch. The reciprocating linear moving body includes a second clutch and a second shaft.

  The first clutch and the second clutch are accommodated in the holes of the case.

  A 1st axis | shaft is mounted | worn with the mounting part with which an electric tool is equipped and rotates in the circumferential direction, and rotates in the circumferential direction.

  The first clutch is connected to the first shaft and rotates in the circumferential direction. The first clutch has a first facing surface facing toward the front side in the axial direction, and includes a first projecting portion projecting toward the front side in the axial direction on the first facing surface. The first clutch has a first pin hole.

  The second clutch has a second facing surface facing the first facing surface facing the rear side in the axial direction, and a second projecting portion projecting toward the rear side in the axial direction is used as the second facing surface. Prepare. When the first clutch rotates in the circumferential direction, the second protrusions alternate between being in contact with the first protrusion and not being in contact with the first protrusion. The second clutch reciprocates in the axial direction. The second clutch has a second pin hole.

  The second shaft is connected to the second clutch and reciprocates in the axial direction.

  The mounting portion is connected to the second shaft and reciprocates in the axial direction. A tip tool is mounted on the mounting portion.

  The motion conversion adapter further includes a first spring, a clutch pin, a second spring, and a sphere.

  The first spring is accommodated in the hole and pushes the second clutch toward the rear side in the axial direction.

  The clutch pin is accommodated across the first pin hole and the second pin hole.

  The second spring is housed in the first pin hole and pushes the clutch pin toward the front side in the axial direction.

  The spherical body is accommodated in the second pin hole, is sandwiched between the clutch pin and the reciprocating linear motion body from the axial direction, and makes line contact or point contact with the clutch pin and the reciprocating linear motion body.

  In the present invention, the clutch pin is accommodated across the first pin hole of the first clutch and the second pin hole of the second clutch. For this reason, the clutch pin restricts the second clutch from moving in the radial direction with respect to the first clutch.

  The sphere is sandwiched between the clutch pin and the reciprocating linear motion body from the axial direction, and makes a line contact or a point contact with the clutch pin and the reciprocating linear motion body. For this reason, the sphere can efficiently transmit the axial movement from one of the clutch pin and the reciprocating linear moving body to the other of the clutch pin and the reciprocating linear moving body, but efficiently performs the radial and circumferential movements. I can't tell you.

  By these, in this invention, it can suppress that vibration other than the target reciprocating linear motion and heat | fever generate | occur | produce.

  The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a side view which illustrates typically a power tool with a tip tool provided with a motion conversion adapter of a 1st embodiment. It is a side view which illustrates typically the scraper with which the motion conversion adapter of a 1st embodiment is equipped. It is a side view which illustrates typically the motion conversion adapter of a 1st embodiment. It is a side view which illustrates typically the motion conversion adapter of a 1st embodiment. It is a side view which illustrates typically the motion conversion adapter of a 1st embodiment. It is an expansion perspective view which illustrates typically the 1st clutch and 2nd clutch with which the motion conversion adapter of a 1st embodiment is equipped. It is an expanded sectional view showing typically the case with which the motion conversion adapter of a 1st embodiment is equipped, and the 2nd axis. It is an expanded sectional view showing typically a clutch pin, a steel ball, and a 2nd axis with which a motion conversion adapter of a 1st embodiment is equipped. It is a side view which illustrates typically the electric tool with a tip tool provided with the motion conversion adapter of the 1st modification of a 1st embodiment. It is a side view which illustrates typically a power tool with a tip tool provided with a motion conversion adapter of the 2nd modification of a 1st embodiment.

1 Usage Method of Motion Conversion Adapter FIG. 1 is a side view schematically illustrating an electric tool with a tip tool including the motion conversion adapter of the first embodiment.

  A power tool 100 with a tip tool illustrated in FIG. 1 includes an electric impact driver 110, a motion conversion adapter 111, and a universal scraper 112a. The electric impact driver 110 and the motion conversion adapter 111 constitute an electric tool 115 with a motion conversion adapter.

  The motion conversion adapter 111 is attached to the electric impact driver 110. A universal scraper 112 a is attached to the motion conversion adapter 111.

  The electric impact driver 110 includes a sleeve 120.

  The motion conversion adapter 111 includes a case 130, a first shaft 131, a second shaft 132, and a chuck 133.

  Hereinafter, a direction in which the central axis C of the first shaft 131 and the second shaft 132 extends is referred to as an axial direction D1, and the position of the axial direction D1 and the distance from the central axis C are maintained around the central axis C. The direction to go around is called the circumferential direction D2, and the direction away from or approaching the central axis C while maintaining the positions of the axial direction D1 and the circumferential direction D2 is called the radial direction D3. In addition, the electric impact driver 110 side in the axial direction D1 is referred to as the axial direction D1 rear side, and the universal scraper 112a side in the axial direction D1 is referred to as the axial direction D1 front side.

  The first shaft 131 is attached to the sleeve 120. A universal scraper 112 a is attached to the chuck 133.

  The electric impact driver 110 may be replaced with another type of electric power tool. For example, the electric impact driver 110 may be replaced with an electric drill driver. When the electric impact driver 110 is replaced with another type of electric power tool, the sleeve 120 may be replaced with another type of mounting portion. For example, when the electric impact driver 110 is replaced with an electric drill driver, the sleeve 120 is replaced with a drill chuck.

  The chuck 133 may be replaced with another type of mounting portion. For example, the chuck 133 may be replaced with a sleeve.

  The universal scraper 112a may be replaced with other types of tip tools. For example, the universal scraper 112a may be replaced with other types of scrapers, rock drill bids, hitting bids, and the like.

  The motion conversion adapter 111 does not exhibit the motion conversion function when the universal scraper 112a is not pressed against the object, and push-to-function that exhibits the motion conversion function when the universal scraper 112a is pressed against the object. It is a trigger type motion conversion adapter. The motion conversion adapter 111 also exhibits a motion conversion function even when the case 130 is pulled to the rear side in the axial direction D1.

  When the motion conversion adapter 111 does not exhibit the motion conversion function, when the sleeve 120 rotates in the circumferential direction D2, the first shaft 131 rotates integrally with the sleeve 120 in the circumferential direction D2. The motion is not transmitted from the first shaft 131 to the second shaft 132. For this reason, the second shaft 132 does not reciprocate in the axial direction D1. Further, the chuck 133 and the universal scraper 112a do not reciprocate in the axial direction D1.

  When the motion conversion adapter 111 exhibits a motion conversion function, when the sleeve 120 rotates in the circumferential direction D2, the first shaft 131 rotates in the circumferential direction D2 integrally with the sleeve 120, and the first shaft 131 rotates. Motion is transmitted from the shaft 131 to the second shaft 132. When the motion is transmitted, the rotational motion of the first shaft 131 is converted into the reciprocating linear motion of the second shaft 132. For this reason, the second shaft 132 repeatedly reciprocates in the axial direction D1. The chuck 133 reciprocates in the axial direction D1 integrally with the second shaft 132. The universal scraper 112a reciprocates in the axial direction D1 integrally with the chuck 133. The universal scraper 112a repeatedly applies an impact to the vicinity of the interface between the main body constituting the pressed object and the deposit constituting the object, and peels the deposit from the main body.

2 Example of Scraper FIG. 2 is a side view schematically illustrating a scraper attached to the motion conversion adapter of the first embodiment. FIG. 2 (a) illustrates a universal scraper. FIG. 2 (b) illustrates a narrow-width scraper. FIG. 2 (c) illustrates a wide type scraper.

  A universal scraper 112a illustrated in FIG. 2A, a narrow scraper 112b illustrated in FIG. 2B, a wide scraper 112c illustrated in FIG. 2C, and the like are mounted on the chuck 133. can do. Blades are formed at the tips of the universal scraper 112a and the wide scraper 112c.

3. Structure and Operation of Motion Conversion Adapter Each of FIGS. 3, 4 and 5 is a side view schematically illustrating the motion conversion adapter of the first embodiment. In each figure, a case, a first clutch, a second clutch, a bearing, a lock screw, and a retaining ring provided in the motion conversion adapter of the first embodiment are shown in cross section. FIG. 3 illustrates a state in which the motion conversion adapter does not exhibit the motion conversion function. FIG. 4 illustrates a state in which the motion conversion adapter exhibits a motion conversion function and the chuck is on the front side in the axial direction. FIG. 5 illustrates a state in which the motion conversion adapter exhibits a motion conversion function and the chuck is on the rear side in the axial direction.

  As shown in FIGS. 3, 4 and 5, the motion conversion adapter 111 includes the case 130 and the chuck 133 described above, and includes a rotary motion body 140, a reciprocating linear motion body 141, a first spring 142, and a clutch pin. 143, a second spring 144, a steel ball 145, a bearing 146, a lock screw 147, and a retaining ring 148. The motion conversion adapter 111 may include elements other than these elements. Some parts other than these elements may be omitted.

  When the motion conversion adapter 111 does not exhibit the motion conversion function, the reciprocating linear motion body 141 does not perform the reciprocating linear motion when the rotational motion body 140 performs the rotational motion, as illustrated in FIG. The front end of the chuck 133 is at a position P1 in the axial direction D1. When the motion conversion adapter 111 exhibits the motion conversion function, the reciprocating linear motion body 141 performs the reciprocating linear motion when the rotational motion body 140 performs the rotational motion, as illustrated in FIGS. 4 and 5. The tip of the chuck 133 reciprocates between the position P2 in the axial direction D1 and the position P3 in the axial direction D1. Hereinafter, the structure of the motion conversion adapter 111 that enables such an operation will be described.

  The case 130 has a bottomed cylindrical shape and includes a cylindrical portion 150 and a bottom portion 151. The case 130 may include elements other than these elements. The cylindrical portion 150 has an annular cross-sectional shape in a cross section perpendicular to the axial direction D1, extends in the axial direction D1, and includes a rear end portion 160 and a front end portion 161. The rear end portion 160 is on the rear side in the axial direction D1. The front end 161 is on the front side in the axial direction D1. The bottom portion 151 is connected to the front end portion 161. The case 130 has a hole 170. The hole 170 has a circular cross-sectional shape in a cross section perpendicular to the axial direction D1, and extends in the axial direction D1.

  The rotational motion body 140 is a structure that performs rotational motion, includes the first shaft 131 described above, and includes a first clutch 180. The rotary motion body 140 may include elements other than these elements.

  The first shaft 131 has a rod-like shape, extends in the axial direction D1, and includes a rear end portion 190 and a front end portion 191. The rear end 190 is on the rear side in the axial direction D1, is outside the case 130, and is attached to the sleeve 120. Accordingly, the first shaft 131 is attached to the sleeve 120 and rotates integrally with the sleeve 120 in the circumferential direction D2. The front end 191 is accommodated in the hole 170.

  FIG. 6 is an enlarged perspective view schematically illustrating a first clutch and a second clutch provided in the motion conversion adapter of the first embodiment.

  As shown in FIGS. 3, 4, 5, and 6, the first clutch 180 has a bottomed cylindrical shape, and includes a cylindrical portion 200 and a bottom portion 201. The cylindrical portion 200 has an annular shape in a cross section perpendicular to the axial direction D1, extends in the axial direction D1, and includes a rear end portion 210 and a front end portion 211. The rear end portion 210 is on the rear side in the axial direction D1. The front end 211 is on the front side in the axial direction D1. The bottom part 201 is connected to the rear end part 210.

  The first clutch 180 is accommodated in the hole 170. The cylindrical portion 200 has a cross-sectional shape that matches the cross-sectional shape of the hole 170 in a cross section perpendicular to the axial direction D1. Thereby, the first clutch 180 can slide in the circumferential direction D2. The bottom 201 is connected to the front end 191 of the first shaft 131. As a result, the first clutch 180 is connected to the first shaft 131. Accordingly, the first clutch 180 rotates integrally with the first shaft 131 in the circumferential direction D2.

  The first clutch 180 has a first facing surface 220. The first facing surface 220 is at the front end portion 211 of the cylindrical portion 200 and faces the front side in the axial direction D1. The first clutch 180 includes a first protrusion 230 on the first facing surface 220. The first projecting portions 230 project toward the front side in the axial direction D1, are distributed in the circumferential direction D2, and are separated from the central axis C. Since the first protrusion 230 is separated from the central axis C, the first protrusion 230 moves in the circumferential direction D2 when the first clutch 180 rotates in the circumferential direction D2. The three first protrusions 230 may be replaced with two or less or four or more first protrusions.

  The first clutch 180 has a first pin hole 240. The first pin hole 240 has a circular cross-sectional shape in a cross section perpendicular to the axial direction D1, and extends in the axial direction D1.

  The reciprocating linear motion body 141 is a structure that performs a reciprocating linear motion, includes the second shaft 132 described above, and includes the second clutch 250.

  The second clutch 250 has a cylindrical shape, has an annular cross-sectional shape in a cross section perpendicular to the axial direction D1, extends in the axial direction D1, and has a rear end portion 260 and a front end portion 261. The rear end portion 260 is on the rear side in the axial direction D1. The front end 261 is on the front side in the axial direction D1.

  The second clutch 250 is accommodated in the hole 170. Second clutch 250 has a cross-sectional shape that matches the cross-sectional shape of hole 170. The hole 170 has a section having a constant cross-sectional shape regardless of the position in the axial direction D1. Thereby, the second clutch 250 can slide in the axial direction D1 in the section.

  The second clutch 250 has a second facing surface 270. The second facing surface 270 faces the rear side in the axial direction D1 and faces the first facing surface 220. The second clutch 250 includes a second protrusion 280 on the second facing surface 270. The second protrusions 280 protrude toward the rear side in the axial direction D1, are distributed in the circumferential direction D2, and are separated from the central axis C. The three second protrusions 280 may be replaced with two or less or four or more second protrusions.

  When the motion conversion adapter 111 does not exhibit the motion conversion function, the second facing surface 270 is separated from the first facing surface 220 as illustrated in FIG. When the motion conversion adapter 111 exhibits a motion conversion function, the second facing surface 270 is in contact with the first facing surface 220 as illustrated in FIGS. 4 and 5.

  The 2nd protrusion part 280 is arrange | positioned in the position of radial direction D3 similar to the position of radial direction D3 in which the 1st protrusion part 230 is arrange | positioned. For this reason, when the motion conversion adapter 111 exhibits the motion conversion function, the second protrusion 280 is configured such that the first clutch 180 rotates in the circumferential direction D2 and the first protrusion 230 in the circumferential direction D2. When moved, the state alternately contacts the first protrusion 230 illustrated in FIG. 4 and does not contact the first protrusion 230 illustrated in FIG. 5. In a state where the second protrusion 280 is in contact with the first protrusion 230, as shown in FIG. 4, the second protrusion 280 is arranged at a position on the front side in the axial direction D1. In a state where the second protrusion 280 does not contact the first protrusion 230, as shown in FIG. 5, the second protrusion 280 is disposed at a position on the rear side in the axial direction D1. Accordingly, the second clutch 250 reciprocates in the axial direction D1 between the position on the front side in the axial direction D1 and the position on the rear side in the axial direction D1.

  The 1st protrusion part 230 has a taper-shaped shape which becomes thin as it goes to the axial direction D1 front side. Moreover, the 2nd protrusion part 280 has a taper-shaped shape which becomes thin as it goes to the axial direction D1 rear side. Thereby, when the 2nd protrusion part 280 contacts the 1st protrusion part 230, the 2nd protrusion part 280 can move easily from the position of the axial direction D1 rear side to the position of the axial direction D1 front side. it can.

  An angle θ1 (see FIG. 6) formed by the circumferential side surface 290 of the first protrusion 230 and a cross section perpendicular to the axial direction D1 is 60 ° when viewed from the outer side in the circumferential direction D2. An angle θ2 (see FIG. 6) formed by the circumferential side surface 300 of the second protrusion 280 and a cross section perpendicular to the axial direction D1 is also about 60 °. When θ1 and θ2 are set to a large angle of about 60 °, a strong reciprocating linear motion is generated. However, in this case, vibrations other than the intended reciprocating linear motion are somewhat likely to occur.

  The second clutch 250 has a second pin hole 310. The second pin hole 310 has a circular cross section in a cross section perpendicular to the axial direction D1, and extends in the axial direction D1.

  As shown in FIGS. 3, 4 and 5, the second shaft 132 has a rod-like shape, and has a hexagonal cross-sectional shape in a cross section perpendicular to the axial direction D1, and the axial direction D1. And has a rear end portion 320 and a front end portion 321. The rear end portion 320 is on the rear side in the axial direction D1, is in the hole 170, and is connected to the front end portion 261 of the second clutch 250. As a result, the second shaft 132 is connected to the second clutch 250 and reciprocates in the axial direction D1 integrally with the second clutch 250. The front end 321 is on the front side in the axial direction D1 and is outside the case 130.

  FIG. 7 is an enlarged cross-sectional view schematically illustrating a case and a second shaft provided in the motion conversion adapter of the first embodiment. FIG. 7 illustrates a cross section perpendicular to the axial direction.

  The bottom portion 151 has a through hole 330 as illustrated in FIGS. 3, 4, 5, and 7. The through hole 330 penetrates the bottom portion 151 in the thickness direction, that is, the axial direction D1. The second shaft 132 passes through the through hole 330. The through-hole 330 has a hexagonal cross-sectional shape in a cross section perpendicular to the axial direction D1. The second shaft 132 has a cross-sectional shape that matches the cross-sectional shape of the through hole 330 in a cross section perpendicular to the axial direction D1. For this reason, the second shaft 132 can move in the axial direction D1, but cannot rotate in the circumferential direction D2. In addition, the second clutch 250 to which the second shaft 132 is coupled can also move in the axial direction D1, but cannot rotate in the circumferential direction D2. Therefore, the reciprocating linear moving body 141 can also move in the axial direction D1, but cannot rotate in the circumferential direction D2. In this way, the structure that regulates the rotation of the reciprocating linear motion body 141 in the circumferential direction D2 is provided in the motion conversion adapter 111, whereby the second clutch 250 follows the first clutch 180 and rotates in the circumferential direction D2. It is suppressed. The structure for restricting the rotation of the reciprocating linear motion body 141 in the circumferential direction D2 may be changed. For example, the hexagonal cross-sectional shape may be changed to another cross-sectional shape. Specifically, the hexagonal cross-sectional shape may be changed to a non-circular cross-sectional shape such as a triangular cross-sectional shape or a square cross-sectional shape.

  The chuck 133 is connected to the front end 321 of the second shaft 132 as illustrated in FIGS. 3, 4, and 5. Thus, the chuck 133 is connected to the second shaft 132 and reciprocates in the axial direction D1 integrally with the second shaft 132.

  The first spring 142 is accommodated in the hole 170 in a state of being contracted from the natural length, and is sandwiched between the second clutch 250 and the bottom 151 from the axial direction D1. For this reason, the first spring 142 pushes the second clutch 250 toward the rear side in the axial direction D1. The force with which the first spring 142 pushes the second clutch 250 is the first when the second protrusion 280 contacts the first protrusion 230 and does not contact the first protrusion 230. This is a force for returning the second clutch 250 from the position on the front side in the axial direction D1 to the position on the rear side in the axial direction D1.

  The clutch pin 143 has a rod-like shape, has a circular cross-sectional shape in a cross section perpendicular to the axial direction D1, extends in the axial direction D1, and extends to the first pin hole 240 and the second pin hole 310. Contained across. The clutch pin 143 has a cross-sectional shape that matches the cross-sectional shapes of the first pin hole 240 and the second pin hole 310 in a cross section perpendicular to the axial direction D1. Moreover, the 1st pin hole 240 and the 2nd pin hole 310 have the area which has a fixed cross-sectional shape irrespective of the position of the axial direction D1. For this reason, the clutch pin 143 slides in the axial direction D1 in the section.

  The second spring 144 is accommodated in the first pin hole 240 in a state of being contracted from the natural length, and is sandwiched between the bottom 201 and the clutch pin 143 from the axial direction D1. For this reason, the second spring 144 pushes the clutch pin 143 toward the front side in the axial direction D1, and pushes the reciprocating linear motion body 141 toward the front side in the axial direction D1 via the clutch pin 143 and the steel ball 145. As a result, when the tip tool mounted on the chuck 133 is not pressed against the object, the second clutch 250 is released from the first clutch 180 as shown in FIG. However, it will be in the state which does not demonstrate a motion conversion function.

  The steel ball 145 is accommodated in the second pin hole 310 and is sandwiched between the clutch pin 143 and the second shaft 132 from the axial direction D1. Thus, the steel ball 145 is sandwiched between the clutch pin 143 and the reciprocating linear motion body 141 from the axial direction D1. The second clutch 250 may include a bottom portion connected to the front end of the cylindrical portion, and the steel ball 145 may be sandwiched between the clutch pin 143 and the bottom portion from the axial direction D1.

  FIG. 8 is an enlarged cross-sectional view schematically illustrating a clutch pin, a steel ball, and a second shaft provided in the motion conversion adapter of the first embodiment. FIG. 8 illustrates a cross section including the central axis.

  As illustrated in FIG. 8, the clutch pin 143 has a front end 340. The front end 340 is on the front side in the axial direction D1 and faces the front side in the axial direction D1. The clutch pin 143 has a hole 350 at the front end 340. The hole 350 has a conical shape. The second shaft 132 has a rear end 360. The second shaft 132 has a hole 370 at the rear end 360. The hole 370 has a conical shape. The steel ball 145 is fitted in the hole 350 and the hole 370. Therefore, the steel ball 145 is in linear contact with the clutch pin 143 so as to form a contact line 380 having a circumferential shape, and is a reciprocating linear motion body so as to form a contact line 390 having a circumferential shape. 141 makes line contact. The conical shape may be changed to another shape. When the conical shape is changed to another shape, the contact line 380 and the contact line 390 having a circumferential shape may be changed to a contact line having another shape. The steel ball 145 may make point contact with the clutch pin 143 and the reciprocating linear motion body 141.

  The steel ball 145 that is a sphere made of steel may be replaced with a sphere made of a material other than steel.

  As shown in FIGS. 3, 4, and 5, the bearing 146 is accommodated in the hole 170 and supports the first shaft 131 so that the first shaft 131 can rotate in the circumferential direction D <b> 2. . The lock screw 147 fixes the bearing 146 to the case 130. The retaining ring 148 prevents the lock screw 147 from loosening to the rear side in the axial direction D1.

  In the motion conversion adapter 111, when the tip tool mounted on the chuck 133 is not pressed against the object, the reciprocating linear motion body 141 is moved in the axial direction D1 by the second spring 144 via the clutch pin 143 and the steel ball 145. The second facing surface 270 is pushed away from the first facing surface 220 by being pushed toward the front side. For this reason, even when the sleeve 120 and the rotary motion body 140 rotate in the circumferential direction D2, no motion is transmitted from the rotary motion body 140 to the reciprocating linear motion body 141. Therefore, the motion conversion adapter 111 does not exhibit the motion conversion function.

  On the other hand, when the tip tool mounted on the chuck 133 is pressed against the object, the reciprocating linear motion body 141 resists the force by which the second spring 144 presses the clutch pin 143 by the chuck 133 in the axial direction. D2 is pushed toward the rear side, and the second facing surface 270 comes into contact with the first facing surface 220. For this reason, when the sleeve 120 and the rotary motion body 140 rotate in the circumferential direction D2, the motion is transmitted from the rotary motion body 140 to the reciprocating linear motion body 141. Therefore, the motion conversion adapter 111 exhibits a motion conversion function. The same applies when the case 130 is pulled rearward in the axial direction D1.

  When the motion conversion adapter 111 exhibits a motion conversion function, when the sleeve 120 rotates in the circumferential direction D <b> 2, the first shaft 131 and the first clutch 180 integrally move with the sleeve 120 to the central axis C. It rotates in the circumferential direction D2 as the center, and the first protrusion 230 moves in the circumferential direction D2. As a result, the second protrusion 280 alternates between a state in which the second protrusion 280 is in contact with the first protrusion 230 and a state in which the second protrusion 280 is not in contact with the first protrusion 230, and the position on the front side in the axial direction D1 and the position on the rear side in the axial direction D1. Return to and from the location. Further, the second clutch 250 reciprocates in the axial direction D1, and the second shaft 132 and the chuck 133 reciprocate integrally with the second clutch 250 in the axial direction D1.

  In the motion conversion adapter 111, the clutch pin 143 is accommodated across the first pin hole 240 and the second pin hole 310. For this reason, the clutch pin 143 restricts the second clutch 250 from moving in the radial direction D3 with respect to the first clutch 180.

  Further, in the motion conversion adapter 111, the steel ball 145 is sandwiched between the clutch pin 143 and the reciprocating linear motion body 141 from the axial direction D1, and is in line contact or point contact with the clutch pin 143 and the reciprocating linear motion body 141. The movement in the axial direction D1 can be efficiently transmitted from one of the pin 143 and the reciprocating linear motion body 141 to the other of the clutch pin 143 and the reciprocating linear motion body 141, but the movement in the circumferential direction D2 and the radial direction D3 is efficient. I can't tell you.

  Thus, in the motion conversion adapter 111, generation of vibration and heat other than the intended reciprocating linear motion can be suppressed.

4 Addition of Handle FIG. 9 is a side view schematically illustrating an electric tool with a tip tool including a motion conversion adapter according to a first modification of the first embodiment. FIG. 10 is a side view schematically illustrating a power tool with a tip tool including a motion conversion adapter according to a second modification of the first embodiment.

  In the first modification of the first embodiment, the motion conversion adapter 111 includes a handle 400 that is coupled to the case 130 and extends outward in the radial direction D3 in addition to the above-described elements. In the second modification of the first embodiment, the motion conversion adapter 111 includes a handle 410 coupled to the chuck 133 and extending outward in the radial direction D3 in addition to the above-described elements. Accordingly, it is easy to suppress the case 130 from rotating following the rotary motion body 140, and it is easy to suppress vibrations other than the intended reciprocating linear motion. The handles 400 and 410 are particularly useful when the angles θ1 and θ2 are large.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Electric tool with tip tool 110 Electric impact driver 111 Motion conversion adapter 112a Universal scraper 120 Sleeve 130 Case 131 First shaft 132 Second shaft 133 Chuck 140 Rotating moving body 141 Reciprocating linear moving body 142 First spring 143 Clutch Pin 144 Second spring 145 Steel ball 180 First clutch 250 Second clutch 400 Handle 410 Handle

Claims (3)

A case with a hole;
A first shaft and a first clutch, wherein the first shaft is mounted on a mounting portion that is provided in the electric tool and rotates in the circumferential direction, and rotates in the circumferential direction; A first projecting portion that is connected to the first shaft, rotates in the circumferential direction, has a first facing surface facing the front side in the axial direction, and projects toward the front side in the axial direction. A rotating body having a first pin hole,
A second clutch and a second shaft, the second clutch being housed in the hole and having a second facing surface facing the first facing surface facing the rear side in the axial direction; A second protrusion that protrudes toward the rear side of the direction and alternates between a state in contact with the first protrusion and a state not in contact with the first protrusion when the first clutch rotates in the circumferential direction. On the second facing surface, reciprocating in the axial direction, having a second pin hole, the second shaft being connected to the second clutch and reciprocating in the axial direction. Body,
A mounting portion connected to the second shaft, reciprocating in the axial direction, and mounted with a tip tool;
A first spring housed in the hole and pushing the second clutch toward the rear side in the axial direction;
A clutch pin accommodated across the first pin hole and the second pin hole;
A second spring housed in the first pin hole and pushing the clutch pin toward the front side in the axial direction;
A sphere received in the second pin hole, sandwiched between the clutch pin and the reciprocating linear motion body in an axial direction, and in line contact or point contact with the clutch pin and the reciprocating linear motion body;
Motion conversion adapter with. The motion conversion adapter according to claim 1, further comprising a handle coupled to the case or a mounting portion to which the tip tool is mounted and extending radially outward. The motion conversion adapter according to claim 1 or 2,
The power tool;
Electric tool with motion conversion adapter.

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