JP3117785U - Motion conversion adapter to be mounted on electric tools - Google Patents

Abstract

An object of the present invention is to provide a motion conversion adapter that is mounted on an output part that is driven to rotate in an electric power tool, particularly an impact driver, and converts a rotational force into an impact force to enable use of a tip tool for various purposes.
An output part 3 is attached to an electric power tool 2 that rotates. The casing 4 has an input shaft 5 attached to one end of the casing 4 and the other end of the casing 4 is attached to the other end of the casing 4. A motion converting mechanism that has a chuck portion 7 for mounting the tip tool 25 on the arranged output shaft 6, and converts the rotational motion of the input shaft 5 into a withdrawal (linear) motion between the input shaft 5 and the output shaft 6. Was provided.
[Selection] Figure 1

Description

  The present invention relates to a motion conversion adapter to be mounted on a power tool, and relates to a technology that enables the use of a tip tool for various purposes by converting a rotational force to an impact force by mounting it on an output part that is driven to rotate such as an electric screwdriver. Is.

  Conventionally, cordless power tools powered by rechargeable batteries have been widely used for home use, and are used for operations such as drilling holes and tightening screws and bolts as power tools such as portable power drills and power drivers. ing. These electric tools have functions such as adjustment of rotational speed and rotational torque, and switching of the rotational direction, and the tip tool can be exchanged according to the application.

  As an example of these electric tools, Patent Document 1 describes an impact wrench and an impact driver that perform a tightening operation by applying a striking impact by a rotationally driven hammer to an output shaft.

The structure is such that the rotational force of the motor is decelerated by the speed reduction unit and transmitted to the drive shaft, and a hammer arranged on the outer periphery of the drive shaft is rotated via a cam provided on the drive shaft, and is connected to the tip tool. With the load applied to the output shaft, the hammer, which is guided by the cam and rotates relative to it, retreats against the spring, and the hammer's striking part impactably engages the anvil portion of the output shaft by the restoring force of the spring. A rotational force is applied to the output shaft.
JP-A-7-96474

  By the way, such an electric tool has an internal structure in which the movement direction of the output shaft is limited to the rotation direction or the withdrawal / retraction direction (striking, vibration), and the tip tool attached to the output shaft is of limited use. Become. For example, since the output shaft rotates in an electric drill or an electric screwdriver, the tip tool to be mounted is limited to a drill for drilling use or a screwdriver for screw or bolt tightening. In addition, since the output shaft of the electric hammer drill moves back and forth (straight), the tip tool to be mounted is limited to a hammer for impact use or a bit for rock drilling.

  However, there are various types of work on site, and there are various types of tip tools used for each application. For this reason, carrying an electric tool for each application is a burden on the operator, and one electric tool that can handle more applications is required.

  The present invention solves the above-mentioned problems, and attaches to an output part that is rotationally driven in an electric power tool, particularly an impact driver to convert the rotational force into an impact force, thereby enabling the use of a tip tool for various purposes. An object is to provide a motion conversion adapter.

  In order to solve the above problems, the motion conversion adapter attached to the electric tool of the present invention is attached to the electric tool whose output part rotates, and is input to the output part of the electric tool at one end of the casing. Has a shaft, and has a chuck part for mounting the tip tool on the output shaft arranged at the other end of the casing, and converts the rotational motion of the input shaft between the input shaft and the output shaft into a retractable (linear) motion A motion conversion mechanism is provided.

  In the above configuration, in use, for example, a scraper used for applications such as peeling and cutting is mounted on the chuck portion. In the state where the casing is gripped, the input shaft rotates as the output part of the power tool rotates, and the input shaft's rotational motion is converted into a withdrawal (linear) motion by the motion conversion mechanism, and the output shaft moves in the axial direction. To leave. The scraper of the chuck part and the tip tool moves out and pulls out as the output shaft moves out and performs operations such as peeling and cutting.

  According to the present invention as described above, by attaching a motion conversion adapter in a drill for drilling as a tip tool, an electric drill, an electric screwdriver, an impact screwdriver or the like that exclusively installs a screw or bolt tightening screwdriver, By converting the rotary motion of the output part into a retractable (linear) motion, it is possible to use hammers for striking applications, bits for rock drilling, and scrapers for peeling, cutting, etc. as tip tools. The application of the tool can be expanded.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4, the motion conversion adapter 1 is used for an impact driver 2 that is an electric tool, for example, and is attached to a driver chuck portion 3 that forms an output portion of the impact driver 2.

  The motion conversion adapter 1 has an input shaft 5 attached to the driver chuck portion 3 of the impact driver 2 at one end of the casing 4, and a chuck portion for attaching a tip tool to the output shaft 6 disposed at the other end of the casing 4. 7.

  Between the input shaft 5 and the output shaft 6, there is provided a motion conversion mechanism for converting the rotational motion of the input shaft 5 into a withdrawal (linear) motion. The motion conversion mechanism includes a drive-side clutch 8 that rotates integrally with the input shaft 5, a driven-side clutch 9 that moves together with the output shaft 6 in the axial direction, a cam portion 10 provided in the drive-side clutch 8, A follower portion 11 provided in the driven clutch 9 and a spring 12 that presses the driven clutch 9 toward the driving clutch 8 are provided.

  The cam portion 10 is externally fitted to the follower portion 11, and the follower portion 11 is pressed by pressing the sliding surface outside the follower portion 11 around the axis of the input shaft 5 with the cam surface inside the cam portion 10. The driven clutch 9 moves in a direction away from the driving clutch 8 against the pressing force of the spring 12.

  As the cam portion 10 rotates integrally with the drive side clutch 8, the cam portion 10 and the follower portion 11 are repeatedly engaged and disengaged, and when engaged, the follower portion 11 and the driven side clutch 9 become integral with the spring 12. It moves in a direction away from the driving side clutch 8 against the pressing force, and the follower part 11 moves in a direction approaching the driving side clutch 8 together with the driven side clutch 9 by the restoring force of the spring 12 when released. Then, the rotational motion of the drive side clutch 8 is converted into the withdrawal (linear) motion of the driven side clutch 9.

  The output shaft 6 has a polygonal cross section, here a hexagonal shape, the insertion hole 13 of the casing 4 through which the output shaft 6 is inserted has a shape corresponding to the polygonal shape of the output shaft 6, and the output shaft 6 is in the insertion hole 13. The casing 4 is engaged with the casing 4 around the shaft center, and is held so as to be movable in and out of the shaft center. With this structure, the casing 4 takes a reaction force against the rotational force transmitted from the drive side clutch 8 to the driven side clutch 9.

  The input shaft 5 is rotatably held in the casing 4 via a bearing 14 made of a bearing. The bearing 14 is fixed in the axial direction by a bearing lock screw 15, and the bearing lock screw 15 is axially centered by a single ring 16. Stops in the direction.

  In the vicinity of the cam portion 10 and the follower portion 11, annular grooves 17 and 18 are formed on the outer peripheral surfaces of the driving side clutch 8 and the driven side clutch 9, and O-rings 19 and 20 are attached to the annular grooves 17 and 18. Yes. Further, a grease injection port 21 is formed in the casing 4 at a position corresponding to both the O-rings 19 and 20, and grease is filled from the grease injection port 21 to the fitting portion of the cam portion 10 and the follower portion 11. ing.

  The chuck portion 7 includes a pair of chuck claws 22 that hold the tip tool, a receiving portion 23 that holds the chuck claws 22 and is fixed to the output shaft 6, and is externally fitted to the chuck claws 22 and screwed to the receiving portion 23. The head clamping portion 24 is provided, and both the chuck claws 22 are pressed against each other by the tapered surface of the inner periphery of the head clamping portion 24 to grip the tip tool.

  In this embodiment, the tip tool is a scraper 25. As shown in FIG. 2, the scraper 25 includes a universal blade 25a, a narrow die 25b, a wide die (with blade) 25c, and the like. The tip tool is not limited to the scraper 25, and a bit corresponding to a use such as crushing or cutting can also be applied.

  Hereinafter, the operation of the above configuration will be described. When using the motion conversion adapter 1, the input shaft 5 of the motion conversion adapter 1 is mounted on the driver chuck portion 3 of the impact driver 2, and the scraper 25 is mounted on the chuck portion 7 of the motion conversion adapter 1. In the present embodiment, as shown in FIG. 3, a universal blade 25a is attached.

  In a state where the casing 4 is gripped, the scraper 25 is pressed against the object, and the impact driver 2 is driven. As the driver chuck portion 3 of the impact driver 2 rotates, the input shaft 5 rotates.

  The rotational motion of the input shaft 5 is converted into a withdrawal (linear) motion by the motion conversion mechanism. In the motion conversion mechanism, as the drive side clutch 8 rotates together with the input shaft 5 and the cam portion 10 rotates integrally with the drive side clutch 8, the cam portion 10 and the follower portion 11 are repeatedly engaged and disengaged. When engaged, the follower portion 11 moves together with the driven-side clutch 9 in a direction away from the drive-side clutch 8 against the pressing force of the spring 12, and when disengaged, the follower portion 11 is moved by the restoring force of the spring 12. 9 is moved in the direction of approaching the drive side clutch 8. That is, as the cam portion 10 and the follower portion 11 are engaged / disengaged, the driven clutch 9 is withdrawn and withdrawn, and the output shaft 6 is withdrawn in the axial direction.

The chuck portion 7 and the scraper 25 of the tip tool are withdrawn and withdrawn from the output shaft 6 to perform operations such as peeling and cutting.
Therefore, the rotary motion of the drive side clutch 8 is converted into the retreat (linear) motion of the driven side clutch 9, so that a hammer or rock drilling as a tip tool can be used as a tip tool in an electric drill, an electric driver, an impact driver or the like. Bits for applications and scrapers for applications such as peeling and cutting can be used, and applications of power tools can be expanded.

The schematic diagram which shows the use condition of the motion conversion adapter in embodiment of this invention (A), (b), (c) is a top view which shows the various scrapers in the embodiment Enlarged view of the motion conversion adapter in the same embodiment Sectional view of the motion conversion adapter in the same embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motion conversion adapter 2 Impact driver 3 Driver chuck part 4 Casing 5 Input shaft 6 Output shaft 7 Chuck part 8 Drive side clutch 9 Driven side clutch 10 Cam part 11 Follower part 12 Spring 13 Insertion hole 14 Bearing 15 Bearing lock screw 16 Ring 17, 18 Annular groove 19, 20 O-ring 21 Grease inlet 22 Chuck claw 23 Receiving part 24 Head clamping part 25 Scraper 25a Universal blade 25b Narrow type 25c Wide type (with blade)

Claims (1)

The output part is attached to a power tool that rotates, and has an input shaft attached to the output part of the power tool at one end of the casing, and the tip tool is attached to the output shaft arranged at the other end of the casing. A motion conversion adapter to be mounted on an electric tool, characterized in that a motion conversion mechanism that converts the rotational motion of the input shaft into a retractable (linear) motion is provided between the input shaft and the output shaft.

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