WO2018139372A1

WO2018139372A1 - Fastening tool

Info

Publication number: WO2018139372A1
Application number: PCT/JP2018/001657
Authority: WO
Inventors: 俊人藪名香; 洋規生田; 貴勇畔柳
Original assignee: 株式会社マキタ
Priority date: 2017-01-27
Filing date: 2018-01-19
Publication date: 2018-08-02
Also published as: JP2018118294A

Abstract

This fastening tool 1 is provided with a fastening mechanism, a motor 20, an intermediate shaft 25, an outer housing 11, and a handle 15. The motor 20 is disposed such that the rotation axis A2 thereof extends in a direction intersecting a front-rear direction. The intermediate shaft 25 is disposed in a path through which power is transmitted from the motor 20 to the fastening mechanism, and the intermediate shaft 25 extends in the direction of the rotation axis A2. The outer housing 11 includes a first portion 111 extending in the front-rear direction, and also includes a second portion 113 protruding from the first portion 111 in the direction of the rotation axis A2. The handle 15 protrudes behind the second portion 113 from the first portion 111 while facing the second portion 113. The handle 15 is provided with a grip section 153. The motor 20 is provided inside the second portion 113 and is disposed in a lower end first region 115 located farther away in the direction of the rotation axis A2 from the first portion 111 than a predetermined region corresponding to the lower end region of the grip section 153.

Description

Fastening tool

The present invention relates to a fastening tool for fastening a work material via a fastener.

A fastening tool for fastening a plurality of work materials via a fastener having a pin and a cylindrical body is known. In addition, as a fastener, a pin and a cylindrical body (also referred to as a collar) are formed separately from each other, a so-called multi-member swaged type fastener (multi-piece swage typeenerfastener), a pin and a cylindrical body ( A so-called blind rivet (or blind fastener) that is integrally formed with a rivet body or sleeve) is used. For example, Japanese Patent No. 5928803 discloses a fastening tool for blind rivets. This fastening tool is formed in a T-shape, and includes a housing extending in the front-rear direction and a handle extending downward from a central portion of the housing. A fastening mechanism including a nose, a motor unit, and a power transmission / control unit is housed in the housing.

The fastening tool is suitably used for a scene where the work material needs to be particularly firmly fastened, for example, in a manufacturing process of a transport device such as an aircraft or an automobile. The user operates the fastening tool in various directions while holding the grip portion. In the fastening tool disclosed in Patent Document 1, parts having relatively large weights such as a nose, a motor unit, and a power transmission / control unit are arranged in a concentrated manner in a housing connected above the handle. For this reason, it may be difficult for the user to operate the fastening tool depending on in which direction the fastening tool is directed.

In view of such a situation, the present invention aims to provide a technique that contributes to improving the operability of the fastening tool.

According to one aspect of the present invention, there is provided a fastening tool for fastening a work material via a fastener including a pin and a cylindrical body. The fastening tool includes a fastening mechanism, a motor, an intermediate shaft, a housing, and a handle.

The fastening mechanism is configured to move the fastener pin relative to the cylindrical body along a predetermined axis extending in the front-rear direction of the fastening tool. The motor is arranged so that the rotation axis extends in a direction intersecting the front-rear direction. The motor is configured to drive the fastening mechanism. The intermediate shaft is disposed in a power transmission path from the motor to the fastening mechanism. The intermediate shaft extends in the direction of the rotation axis, which is the direction in which the rotation axis extends. The housing includes at least a first portion and a second portion. The first portion extends in the front-rear direction and accommodates at least a part of the fastening mechanism. The second part protrudes from the first part in a predetermined direction of the rotation axis direction and accommodates the motor and the intermediate shaft.

The handle protrudes from the first portion on the rear side of the second portion so as to face the second portion. The handle includes a grip portion configured to be gripped by a user's finger. The grip portion includes a trigger. The trigger is arranged at the front portion of the first end region on the first part side of the grip portion so that a pressing operation with a finger is possible.

In the second portion, the motor is separated from the first portion in a predetermined region corresponding to the second end region on the opposite side of the first end region of the grip portion or in the direction of the rotation axis. Arranged in the area.

When the fastening tool is used while the user is gripping the grip part, it is said that it is easy to operate if the position of the center of gravity is in the vicinity of the finger (particularly the middle finger) gripping the grip part. In view of this point, in the fastening tool of this aspect, the second portion and the handle protrude in a predetermined direction from the first portion extending in the front-rear direction. The fastening mechanism is housed in the first part, while the motor is in the second part and corresponds to the second end region of the grip portion (that is, the end region on the side away from the first portion). It is accommodated in a region or a region further away from the first portion than this predetermined region. With this arrangement, the position of the center of gravity of the fastening tool is more distant from the first part in the predetermined direction (the second part and the second part) than when the relatively heavy motor and the fastening mechanism are arranged close to each other. It can be arranged on the protruding direction side of the handle. That is, the position of the center of gravity can be brought closer to the vicinity of the finger gripping the grip portion (specifically, the front side of the grip portion) in the direction of the rotation axis of the motor.

In addition, when the motor is housed in a predetermined region of the second portion arranged in front of the handle or a region farther from the first portion than the predetermined region as in this aspect, the center of gravity position of the fastening tool is It tends to be located more forward than. On the other hand, in the case where the handle is juxtaposed on the rear side of the second part, in order to allow the user to operate the trigger while holding the grip part, there is a certain amount between the grip part and the second part. Space is required. On the other hand, according to this aspect, about the part in which the intermediate shaft is accommodated among 2nd parts, the size of radial direction can be reduced compared with the part in which the motor is accommodated. Therefore, compared with the case where the motor is disposed close to the first portion, the handle can be disposed further forward, and thereby the position of the center of gravity is brought closer to the vicinity of the finger holding the grip portion in the front-rear direction. Therefore, it is possible to realize a fastening tool having excellent operability.

In addition, as a fastener which can be used in the fastening tool of this aspect, what is called a multiple member crimping type fastener (multi-piece swage type fastener) and a blind rivet (or blind fastener) are mentioned, for example.

In a multiple member crimping fastener, a pin and a cylindrical portion (also referred to as a collar) through which the pin is inserted are originally formed as separate bodies. The multi-member crimping fastener is a fastener of a type in which a work material is sandwiched between a pin head and a cylindrical portion crimped to a shaft portion of the pin. On the other hand, in a blind rivet, a pin and a cylindrical body (also referred to as a rivet body or a sleeve) are integrally formed. A flange is integrally formed at one end of the cylindrical portion. Typically, the shaft portion of the pin penetrates the cylindrical portion, protrudes long at one end side where the flange of the cylindrical portion is formed, and the head protrudes so as to be adjacent to the other end of the cylindrical portion. A blind rivet is a type of fastener that clamps a work material between a flange portion at one end of a cylindrical portion and the other end portion of the cylindrical portion that has been deformed so that its diameter is expanded by pulling the pin in the axial direction. is there.

In the case of blind rivets, the pin shaft part (also referred to as pin tail or mandrel) is finally torn off by the small diameter part for breaking by the fastening operation. On the other hand, there are two types of fasteners of the multiple member crimping type, a type in which the pin tail is torn off and a type in which the shaft portion is maintained as it is, similar to the blind rivet. In any type of fastener, the fastening of the work material by the fastener is performed by moving the pin relative to the cylindrical body by the fastening mechanism.

The fastening mechanism only needs to be configured so that the fastener pin can be moved relative to the cylindrical body along a predetermined axis (virtual line), and any known configuration can be adopted. The fastening mechanism typically includes an anvil that comes into contact with or engages with the cylindrical body, a pin gripping portion having a claw configured to be able to grip the pin, and a pin gripping portion in the front-rear direction (predetermined). It is only necessary to include a drive mechanism (for example, a ball screw mechanism) configured to be relatively moved in the axial direction).

The motor may be a direct current motor or an alternating current motor, and the presence or absence of a brush is not particularly limited. However, a brushless DC motor is preferably employed from the viewpoint of being small and providing a large output. The rotation axis of the motor refers to the rotation axis (imaginary line) of the output shaft that rotates together with the rotor of the motor.

The intermediate shaft is typically configured as a shaft in which no other power transmission member (gear or the like) is fixed to the outer peripheral portion (radially outer side). The intermediate shaft only needs to be configured to rotate with driving of the motor and transmit power to other mechanisms. The intermediate shaft may be disposed in the power transmission path from the motor to the fastening mechanism, and another mechanism may be interposed between the motor and the intermediate shaft and / or between the intermediate shaft and the fastening mechanism. . The intermediate shaft may be arranged coaxially with the rotation axis of the motor, or may be arranged parallel to the rotation axis of the motor.

The housing is a part also called a tool body. The housing may include a portion other than the first portion and the second portion. The housing may be a one-layered housing or a two-layered housing. The housing may be formed by connecting a plurality of portions.

The handle only needs to extend opposite the second portion on the rear side of the second portion. Typically, the handle protrudes from the first part in parallel with the second part. The handle preferably extends generally parallel to the second portion, but need not necessarily be parallel to the second portion. Further, in the extending direction of the handle, an area extending over the entire length of the handle may be configured as a grip part, or only a part of the area may be configured as a grip part. The trigger is typically configured as an operation member that turns on a switch that drives a motor by the pressing operation. In addition, the trigger is generally an operation member that is pressed (pulled) by the index finger among fingers that hold the grip portion. For this reason, in a grip part, it arrange | positions in the 1st edge part area | region by the side of a 1st part. In view of the operability of the fastening tool, the grip portion is preferably disposed adjacent to the first portion in the handle extending direction.

According to one aspect of the present invention, the fastening tool may further include a planetary speed reducer disposed between the motor and the intermediate shaft in the power transmission path. By arranging the planetary reduction gear having a relatively large reduction ratio between the motor and the intermediate shaft, the rotational speed of the intermediate shaft can be sufficiently reduced as compared with the rotational speed of the motor. Therefore, according to this aspect, the balance can be roughly set even if the intermediate shaft is relatively long. Therefore, compared with the case where no planetary reduction gear is provided, in the second portion, the region where the intermediate shaft extends, that is, the region where the radial size can be reduced can be made longer. The planetary reduction gear is typically configured mainly with a planetary gear mechanism including a sun gear, a planetary gear, and an internal gear. The planetary speed reducer may include only one planetary gear mechanism, or may include two or more planetary gear mechanisms.

According to one aspect of the present invention, the fastening tool may further include a transmission mechanism disposed between the intermediate shaft and the fastening mechanism in the power transmission path. The transmission mechanism may be configured as a bevel gear mechanism that is disposed coaxially with the intermediate shaft and includes a first bevel gear that is rotated by the intermediate shaft and a second bevel gear that meshes with the first bevel gear. According to this aspect, the direction of the power transmission path intersects the axial direction of the intermediate shaft (that is, the rotational axis direction of the motor) by the transmission mechanism including the bevel mechanism arranged between the intermediate shaft and the fastening mechanism. You can change the direction. In addition, since the planetary reduction gear is disposed upstream of the bevel gear mechanism in the power transmission path, the reduction ratio of the bevel gear mechanism can be suppressed, so that the bevel gear mechanism can be made compact.

According to one aspect of the present invention, the intermediate shaft may be coupled to the shaft portion of the first bevel gear via the sleeve. According to this aspect, centering can be facilitated even when a relatively long intermediate shaft is employed. In addition, as a connection mode of the intermediate shaft and the shaft portion via the sleeve, for example, a mode in which one end portion of the intermediate shaft and one end portion of the shaft portion are non-rotatably fitted to the sleeve can be employed. For example, one end portion of the sleeve and the intermediate shaft and one end portion of the shaft portion may be configured to have a polygonal cross section, or fitting by a spline may be employed.

According to one aspect of the present invention, the rotation shaft of the motor may extend obliquely rearward in a predetermined direction with respect to a predetermined axis extending in the front-rear direction. According to this aspect, the 2nd part which protrudes from a 1st part in the predetermined direction among the rotating shaft directions of a motor protrudes toward diagonally back from a 1st part. Since the motor is disposed in a predetermined region of the second part or a region farther from the first part than the predetermined region, the motor rotation axis may extend in a direction perpendicular to the predetermined axis or may be inclined forward. Compared with the case where it is doing, a motor can be arrange | positioned more back. Thereby, the gravity center of a fastening tool can be arranged more back, and it can be brought close to the vicinity of the finger which grasps a grip part.

According to an aspect of the present invention, the fastening tool further includes a battery mounting portion provided on the housing or the handle, and a battery mounted on the battery mounting portion, and the center of gravity of the battery is greater than the trigger in the front-rear direction. It may be located rearward. According to this aspect, the battery having a relatively large weight is attached to the battery attachment portion so that the center of gravity of the battery is located behind the trigger, so that the center of gravity of the fastening tool when the battery is attached is further rearward. And can be brought close to the vicinity of the finger holding the grip portion.

According to the aspect of the present invention, the center of gravity of the fastening tool when the battery is mounted is located on the opposite side of the first portion with respect to the trigger and in the vicinity of the trigger in the extending direction of the handle. Also good. In general, in a fastening tool in which a user operates a trigger with an index finger while holding the grip portion, the center of gravity of the fastening tool is located near the second joint of the middle finger from the viewpoint of operability. It is considered the best. According to this aspect, such an arrangement of the center of gravity can be realized.

According to one aspect of the present invention, the housing may include a third portion that extends rearward from an end region on the protruding side of the second portion. The battery mounting part may be provided in the third part.

According to one aspect of the present invention, the fastening tool may further include a controller housed in the third portion.

According to one aspect of the present invention, the third portion may be connected to the end of the handle on the protruding side.

It is sectional drawing for demonstrating an example of a fastener. It is a longitudinal cross-sectional view which shows the whole structure of a fastening tool. FIG. 3 is a partially enlarged view of a region including the first portion and the nose assembly of FIG. 2. It is a cross-sectional view for explaining the internal structure of the first portion and the nose assembly. FIG. 3 is a partial enlarged view of a region including a second portion of FIG. 2. It is explanatory drawing of the fastening process of a fastener. It is explanatory drawing of the fastening process of a fastener.

Hereinafter, embodiments will be described with reference to the drawings. In addition, in the following embodiment, the fastening tool 1 which can fasten the working material W using the fastener 8 is illustrated.

First, the fastener 8 that can be used with the fastening tool 1 will be described with reference to FIG. The fastener 8 is a well-known fastener called a multi-piece crimping type fastener (multi-piece swage type fastener), and includes a pin 80 and a collar 85 formed separately from each other. Details of the fastener 8 will be described below.

The fastener 8 shown in FIG. 1 is a so-called breaking type (tear-off type) fastener among the multiple member crimping type fasteners. The fastener 8 is mainly composed of a pin 80 and a collar 85.

The pin 80 includes a shaft portion 81 and a head 83 formed integrally with one end portion of the shaft portion 81. The head 83 is formed in a flat circular shape having a larger diameter than the shaft portion 81. The shaft portion 81 is formed in a rod shape and has a substantially uniform diameter over the entire length. However, a substantially central portion in the axial direction of the shaft portion 81 is formed to have a smaller diameter than other portions. This portion is referred to as a small-diameter portion 811 for breaking. The small-diameter portion 811 is a portion that is relatively weaker than the other portions, and is configured to break first when the pin 80 is pulled in the axial direction. More specifically, the strength of the small-diameter portion 811 is configured to be broken when a greater axial force, that is, a tensile force, than that required for crimping the collar 85 is reached.

In the shaft portion 81, a region opposite to the head 83 with respect to the small diameter portion 811 is a portion called a pin tail 812 that is finally separated from the pin 80. In the present embodiment, an annular pulling groove 813 is formed on the outer peripheral surface of the pin tail 812 so that a pin gripping portion 65 described later can securely grip and pull the pin 80. In the present embodiment, the tension groove 813 is formed over substantially the entire area of the pin tail 812.

On the other hand, a region between the small diameter portion 811 and the head 83 in the shaft portion 81 is a portion referred to as a base portion 816. A caulking groove 817 is formed on the outer peripheral surface of the base portion 816. Although the details will be described later, the caulking groove 817 is configured as a groove into which the collar 85 deformed in the fastening process can be closely attached. In the present embodiment, the caulking groove 817 is formed in an annular shape, and is provided over most of the region on the small diameter portion 811 side of the base portion 816. As described above, the minimum diameter of the portion in which the tension groove 813 and the caulking groove 817 are formed is smaller than the diameter of the small diameter portion 811 so that the shaft portion 81 is broken at the small diameter portion 811 with a predetermined tensile force. large.

The collar 85 is formed in a cylindrical shape having a hollow portion 86 (through hole). A flange 851 that is in contact with the work material W in the fastening process is formed at one end of the outer periphery of the collar 85. The outer peripheral portion other than the flange 851 constitutes an engaging portion 852 that engages with a tapered portion 622 (see FIG. 3) of the anvil 61 described later in the fastening operation. The engagement portion 852 is a crimping region that is deformed by a crimping force applied to the anvil 61 in the collar 85. The inner diameter of the collar 85 is set slightly larger than the diameter of the base portion 816 of the pin 80. The collar 85 is engaged with the pin 80 when the shaft portion 81 of the pin 80 is inserted into the hollow portion 86.

As shown in FIG. 1, when fastening two working materials W using the fastener 8, the user first sets the working material W so that the head 83 is in contact with one working material W. The shaft portion 81 of the pin 80 is inserted through the attachment hole W1 formed in the above. Thereafter, the user engages the collar 85 with the shaft portion 81 in a loose-fit manner from the other work material W side. At this time, the collar 85 is not in close contact with the caulking groove 817 of the shaft portion 81. Hereinafter, such a state is referred to as a temporarily fixed state. In a state where the collar 85 is temporarily fastened to the shaft portion 81, the user performs a work of fastening the work material W by crimping the collar 85 to the shaft portion 81 with the fastening tool 1.

In the fastening tool 1, in addition to the fastener 8 illustrated in FIG. 1, the axial length and diameter of the pin 80 (pin tail 812) and the collar 85, and the positions and shapes of the tension groove 813 and the caulking groove 817 are different. Several types of breakable fasteners can be used.

Hereinafter, the fastening tool 1 will be described. First, a schematic configuration of the fastening tool 1 will be briefly described with reference to FIG. As shown in FIG. 2, the outer shell of the fastening tool 1 is mainly formed by a nose assembly 6 held by an outer housing 11, a handle 15, and a nose holding portion 69.

The outer housing 11 includes a first portion 111, a second portion 113, and a third portion 118. The first portion 111 is a portion that extends along the predetermined axis A 1 and accommodates at least a part of the drive mechanism 4. The second portion 113 is a portion that protrudes from a first end portion of the first portion 111 in the direction of the axis A1 in a direction intersecting the direction of the axis A1, and accommodates the motor 20, the intermediate shaft 25, and the like. The third portion 118 is a portion that extends substantially opposite to the first portion 111 from an end portion on the protruding side of the second portion 113 (an end portion on the side opposite to the end portion connected to the first portion 111). In addition, the battery 19 includes a battery mounting portion 18 configured to be detachable.

The handle 15 protrudes from the other end of the first portion 111 in the axis A1 direction so as to face the second portion 113 and is connected to the third portion 118. The handle 15 has a grip portion 153 that is gripped by the user. The outer housing 11 (the first portion 111, the second portion 113, the third portion 118) and the handle 15 have an annular shape as a whole.

The nose assembly 6 is held via a nose holding portion 69 at one end of the first portion 111 (the end on the side to which the second portion 113 is connected) so as to extend in the direction of the axis A1. In addition, the collection container 7 which can accommodate the pin tail 812 (refer FIG. 1) isolate | separated in the fastening process is attached to the other end part of the 1st part 111 so that removal is possible.

In the following, with respect to the direction of the fastening tool 1, for convenience of explanation, the axis A1 direction is the front-rear direction of the fastening tool 1, the side on which the second portion 113 is disposed (the side on which the nose assembly 6 is disposed), and the handle. The side on which 15 is arranged is defined as the rear side. Further, the direction perpendicular to the axis A1 and corresponding to the extending direction of the second portion 113 is defined as the vertical direction, the side on which the first portion 111 is disposed is defined as the upper side, and the side on which the third portion 118 is disposed is defined as the lower side. To do.

Hereinafter, with reference to FIGS. 2 to 5, a detailed configuration of the internal structure of the fastening tool 1 will be described.

As shown in FIG. 2, the outer housing 11 mainly includes a drive mechanism 4 including a ball screw mechanism 40, a bevel gear mechanism 35, an intermediate shaft 25, a planetary speed reducer 30, a motor 20, and a controller 28. Contained. Of these, a part of the drive mechanism 4 and the bevel gear mechanism 35 are accommodated in the inner housing 12. The inner housing 12 is fixedly held by the outer housing 11. From this point of view, the outer housing 11 and the inner housing 12 can be regarded as the housing 10 integrally. In the present embodiment, the inner housing 12 is disposed so as to occupy the front portion of the first portion 111 and the upper end portion of the second portion 113 in the outer housing 11. In the present embodiment, the outer housing 11 is made of resin, while the inner housing 12 is made of metal.

Hereinafter, with reference to FIG. 3 and FIG. 4, the first portion 111 and the detailed configuration inside thereof will be described.

First, the drive mechanism 4 partially accommodated in the first portion 111 will be described. The drive mechanism 4 is mainly configured by a ball screw mechanism 40 accommodated in the first portion 111 and a connection mechanism 5 that is disposed in the nose holding portion 69 and connects the ball screw mechanism 40 and a pin gripping portion 65 described later. ing. Hereinafter, the ball screw mechanism 40 and its peripheral configuration, and the coupling mechanism 5 and its peripheral configuration will be described in order.

As shown in FIG. 3, the ball screw mechanism 40 is mainly composed of a nut 41 and a screw shaft 46. In the present embodiment, the ball screw mechanism 40 is configured to convert the rotational motion of the nut 41 into the linear motion of the screw shaft 46 so that the pin gripping portion 65 coupled via the coupling mechanism 5 can move linearly. Yes.

The nut 41 is supported by the inner housing 12 in a state where the nut 41 can be rotated around the axis A1 and the movement in the direction of the axis A1 is restricted. Specifically, the nut 41 formed in a cylindrical shape has a driven gear 411 provided integrally on the outer peripheral portion. The nut 41 is supported on the front side and the rear side of the driven gear 411 via a pair of

bearings

412 and 413 fitted on the nut 41 so as to be rotatable about the axis A1. The driven gear 411 meshes with a nut driving gear 38 described later. When the driven gear 411 receives the rotational output of the motor 20 from the nut driving gear 38, the nut 41 is rotated around the axis A1. A thrust bearing 415 is disposed between the front end of the nut 41 and the inner housing 12 to receive a load in the direction of the axis A1 that acts on the nut 41 when the collar 85 is crimped to the pin 80.

The screw shaft 46 is movable along the axis A1 and is held in a state where the rotation around the axis A1 is restricted. Specifically, as shown in FIGS. 3 and 4, the screw shaft 46 is configured as an elongated body, and is inserted through the nut 41 so as to extend along the axis A 1. Although it is a well-known configuration, detailed illustration is omitted, but in a spiral track defined by a screw groove formed on the inner peripheral surface of the nut 41 and a screw groove formed on the outer peripheral surface of the screw shaft 46. A large number of balls are arranged to be able to roll. The screw shaft 46 is engaged with the nut 41 via a ball.

As shown in FIG. 4, the central portion of the roller shaft 463 is fixed to the rear end portion of the screw shaft 46. The roller shaft 463 is disposed so as to protrude from the screw shaft 46 in the left-right direction perpendicular to the screw shaft 46. Rollers 464 are rotatably held at the left and right ends of the roller shaft 463, respectively. On the other hand, as shown in FIGS. 3 and 4, a pair of left and right guide plates 122 are connected and fixed to the rear end portion of the inner housing 12. The guide plate 122 is disposed so as to face in the left-right direction, and has a guide hole 123 having a long hole extending in the direction of the axis A1 (front-rear direction). The pair of left and right rollers 464 are held so as to roll along the pair of left and right guide holes 123 in the direction of the axis A1.

In the ball screw mechanism 40 configured as described above, when the nut 41 is rotated around the axis A1, the screw shaft 46 engaged with the nut 41 via the rolling ball is moved with respect to the nut 41 and the housing 10. It moves linearly in the direction of the axis A1. As the nut 41 rotates, rotational torque around the axis A1 may act on the screw shaft 46, but the roller 464 abuts on the guide hole 123, so that the screw shaft 46 caused by the rotational torque is applied. The rotation around the axis A1 is restricted.

Further, an extended shaft 47 is connected and fixed to the rear end portion of the screw shaft 46 (specifically, the rear side of the roller shaft 463). For this reason, when the screw shaft 46 moves in the front-rear direction along the axis A 1, the extended shaft 47 moves in the front-rear direction integrally with the screw shaft 46. The screw shaft 46 and the extending shaft 47 have through

holes

461 and 471 having substantially the same diameter extending in the major axis direction, and are connected coaxially so that the through

holes

461 and 471 communicate with each other. ing. Note that the diameters of the through

holes

461 and 471 are set to be slightly larger than the maximum diameter of the pin tail of the breakable fastener that can be used in the fastening tool 1.

On the axis A 1 at the rear end portion of the outer housing 11, an opening 140 that connects the inside and the outside of the outer housing 11 is formed. A cylindrical guide tube 141 is fitted in the opening 140. The guide tube 141 is configured to slide and guide the extending shaft 47 along the axis A1. For this reason, the diameter of the through hole 142 of the guide tube 141 (the inner diameter of the guide tube 141) is set to be approximately the same as the outer diameter of the extended shaft 47.

The rear end of the extended shaft 47 is disposed in the front end portion of the guide tube 141 when the screw shaft 46 is disposed at the foremost position (position shown in FIGS. 3 and 4) in the movable range. When the screw shaft 46 is moved rearward from the foremost position along with the rotation of the nut 41, the extended shaft 47 moves rearward while sliding in the through hole 142 of the guide tube 141. By disposing the guide tube 141 as described above, the pin tail 812 is prevented from entering the outer housing 11 when the extended shaft 47 is disposed at the foremost position while suppressing the total length of the extended shaft 47. be able to.

As shown in FIGS. 3 and 4, a container connecting portion 13 that is formed in a cylindrical shape and protrudes rearward is provided at the rear end portion of the outer housing 11. The collection container 7 of the pin tail 812 can be attached to and detached from the container connecting portion 13. As shown in FIG. 2, the collection container 7 includes a cylindrical tubular member 71 and a bottomed tubular lid member 75 that can be attached to and detached from the tubular member 71 by screwing. A female screw is formed on the inner peripheral portion of the opening side end of the cylindrical member 71. On the other hand, a male screw is formed on the outer peripheral portion of the container connecting portion 13. The user can attach the collection container 7 to the outer housing 11 by screwing the cylindrical member 71 into the container connecting portion 13.

As shown in FIG. 2, a container detection switch 70 is provided at the rear end portion of the outer housing 11 adjacent to the lower end portion of the container connecting portion 13. The container detection switch 70 is configured as a push-type switch. The container detection switch 70 includes a switch body disposed in the rear end portion of the outer housing 11 and a plunger that protrudes to the outside of the outer housing 11. When the collection container 7 is not attached to the container connecting portion 13, the container detection switch 70 is held in the initial state in which the plunger is extended and turned off, and the collection container 7 (the cylindrical member 71 or the lid member 75) is turned off. Is attached to the container connecting portion 13, the plunger is pressed by the front end of the collection container 7 and turned on.

Further, as shown in FIG. 3, a magnet holding arm 485 extending downward from the screw shaft 46 is fixed to the screw shaft 46 adjacent to the front side of the roller shaft 463. A magnet 486 is attached to the lower end of the magnet holding arm 485. Since the magnet 486 is integrated with the screw shaft 46, the magnet 486 moves with the movement of the screw shaft 46 in the direction of the axis A1 (front-rear direction).

On the other hand, the outer housing 11 is provided with a position detection mechanism 48 configured to detect the relative position of the screw shaft 46 with respect to the housing 10 in the direction of the axis A1 via the magnet 486. The position detection mechanism 48 includes an initial position sensor 481 and a rearmost position sensor 482. The initial position sensor 481 and the rearmost position sensor 482 are both electrically connected to the controller 28 (see FIG. 2) via wiring not shown, and the magnet 486 is disposed within a predetermined detection range. The predetermined signal is output to the controller 28. The initial position sensor 481 is attached to a position where the magnet 486 can be detected when the screw shaft 46 is disposed at the foremost position (also referred to as an initial position) in the movable range. The rearmost position sensor 482 is attached to a position where the magnet 486 can be detected when the screw shaft 46 is disposed at the rearmost position in the movable range.

Hereinafter, the connecting mechanism 5 will be described. As shown in FIGS. 3 and 4, the connecting mechanism 5 is a mechanism that connects the screw shaft 46 and the pin gripping portion 65 in the direction of the axis A1. As shown in FIG. 4, in this embodiment, the connection mechanism 5 includes a first connection portion 51, a second connection portion 52, and a third connection portion that are sequentially connected in the axis A 1 direction from the screw shaft 46 side (rear end side). A connecting part 53 and a fourth connecting part 54 are included. In addition, the description about the detailed connection aspect of the 1st connection part 51 to the 4th connection part 54 here is abbreviate | omitted.

The first connecting portion 51, the third connecting portion 53, and the fourth connecting portion 54 each have a through-hole that is substantially the same diameter as the through-hole 461 of the screw shaft 46 and extends in the direction of the axis A1. Therefore, the entire connecting mechanism 5 is formed with a passage that penetrates the first connecting portion 51, the second connecting portion 52, the third connecting portion 53, and the fourth connecting portion 54. Furthermore, when the through-hole 461 of the screw shaft 46, the through-hole 471 of the extended shaft 47, and the through-hole 142 of the guide tube 141 are combined, the coupling mechanism 5, the screw shaft 46, the extended shaft 47, and the guide tube 141 are combined. A passage extending along the axis A 1 to the opening 140 provided at the rear end portion of the outer housing 11 is formed. This passage constitutes a collection passage 700 through which the pin tail 812 separated from the pin 80 can pass in the fastening process of the breakable fastener 8.

Hereinafter, the nose holding unit 69 and its peripheral configuration will be described. As shown in FIGS. 3 and 4, the upper front end portion of the inner housing 12 is formed in a cylindrical shape, and a cylindrical guide sleeve 124 is screwed coaxially with the screw shaft 46 therein. The guide sleeve 124 is configured to guide the first connecting portion 51 and the second connecting portion 52 so as to be slidable in the direction of the axis A1. At the upper front end portion of the outer housing 11, an opening 145 centering on the axis A 1 is provided. The flange-shaped front end portion of the guide sleeve 124 protrudes from the opening 145 of the outer housing 11, and holds the cylindrical nose coupling portion 125 fixed to the housing 10. The nose coupling part 125 is arranged coaxially with the screw shaft 46, and a male screw is formed on the outer peripheral surface.

The nose holding part 69 is detachably connected to the nose connecting part 125. The nose holding portion 69 includes an inner sleeve 691 and an outer sleeve 695.

The inner sleeve 691 is formed as a cylindrical body, and is configured to hold the coupling mechanism 5 and a pin gripping portion 65 described later so as to be slidable in the direction of the axis A1. Specifically, the inner sleeve 691 has substantially the same inner diameter as the outer diameter of the second connecting portion 52 and the outer diameter of the anvil 61, and an anvil engagement projecting radially inward at the central portion in the direction of the axis A 1. A portion 692 is formed. The inner diameter of the portion where the anvil locking portion 692 is formed is substantially the same as the outer diameter of the pin gripping portion 65. A flange 693 is provided at the rear end of the inner sleeve 691. The flange 693 is formed to have a slightly smaller diameter than the outer diameter of the nose coupling portion 125.

The outer sleeve 695 is formed as a cylindrical body that is slightly larger than the inner sleeve 691, and is configured to be detachable from the nose coupling portion 125. Specifically, the outer sleeve 695 includes a small diameter portion 696 having an inner diameter that is substantially the same as the outer diameter of the inner sleeve 691 and a large diameter portion 698 having an inner diameter that is substantially the same as the outer diameter of the nose coupling portion 125. The small diameter portion 696 is formed to be longer than the portion excluding the flange 693 of the inner sleeve 691 in the axis A1 direction, and the front end portion 697 protrudes radially inward. On the inner peripheral surface of the large diameter portion 698, a female screw that can be screwed into the male screw of the nose connecting portion 125 is formed.
The outer sleeve 695 is fitted on the outer side of the inner sleeve 691 in a state where the rear end surface of the flange 693 is in contact with the nose connecting portion 125, and the large diameter portion 698 is screwed into the nose connecting portion 125. The holding portion 69 is connected and fixed to the housing 10. At this time, a gap is formed between the front end portion 697 of the outer sleeve 695 and the front end of the inner sleeve 691 in which a locking rib 625 (see FIG. 3) of the anvil 61 described later is disposed.

Hereinafter, the nose assembly 6 will be described. As shown in FIG. 3, the nose assembly 6 is mainly composed of an anvil 61 and a pin gripping portion 65.

The anvil 61 is configured as a cylindrical body having a bore 621 extending in the direction of the axis A1. The bore 621 includes a tapered portion 622 and a guide portion 623.

The tapered portion 622 constitutes a front end region of the bore 621 and is set slightly longer than the height of the engaging portion 852 (see FIG. 1) of the collar 85 in the direction of the axis A1 (front-rear direction). The tapered portion 622 gradually increases in diameter toward the opening end (front end) 620 of the bore 621. The diameter of the tapered portion 622 is set to be slightly larger than the outer diameter of the engaging portion 852 at the opening end 620, but smaller than the outer diameter of the engaging portion 852 behind the opening end 620. Accordingly, only when a strong axial force that promotes deformation of the engaging portion 852 is applied, the engaging portion 852 can enter the opening end 620 from the opening end 620 with deformation. The guide portion 623 constitutes a region on the rear side of the tapered portion 622 in the bore 621. The guide part 623 is larger than the diameter of the rear end of the taper part 622, and has a diameter substantially the same as the outer diameter of the pin gripping part 65 described later, so that the pin gripping part 65 can slide in the direction of the axis A1. Hold.

Further, a locking rib 625 protruding outward in the radial direction is provided on the rear end side slightly from the central portion of the outer peripheral portion of the anvil 61. When the locking rib 625 is locked between the outer sleeve 695 and the inner sleeve 691, the anvil 61 is held immovably in the direction of the axis A1 with respect to the housing 10 via the nose holding portion 69.

The pin gripping part 65 is disposed in the guide part 623 of the anvil 61 so as to be slidable coaxially. That is, the pin gripping portion 65 is held so as to be movable relative to the anvil 61 along the axis A1. In the present embodiment, the pin gripping portion 65 is a well-known configuration mainly composed of a plurality of claws (also referred to as jaws) capable of gripping a part of the pintail 812 (see FIG. 1) and its holding body. Is adopted. Although detailed illustration is omitted, the pin gripping portion 65 is configured such that the gripping force by the claw increases as it moves rearward from the initial position (frontmost position) along the axis A1. Such a configuration is realized, for example, by arranging a plurality of claws so as to be movable while being pressed against a conical track provided in the front end portion of the holding body. In the present embodiment, a plurality of protrusions that can be engaged with the pulling grooves 813 formed in the pin tail 812 are formed on the inner side of the claw.

In the drawing, a plurality of claws, a holding body, and other parts are shown in a simplified form as a single unit. However, the pin gripping portion 65 is a cylinder having a bore 661 extending in the direction of the axis A1 as a whole. It is formed as a body. The diameter of the bore 661 is set slightly larger than the diameter of the pin tail 812. The bore 661 defines an internal passage 662 through which the pin tail 812 is inserted and separated. Further, the rear end portion of the pin gripping portion 65 is configured to be able to be screwed into a male screw formed on the outer peripheral surface of the front end portion of the fourth connecting portion 54. As a result, the pin gripping portion 65 can be attached to and detached from the screw shaft 46 via the coupling mechanism 5.

When the pin gripping portion 65 is connected to the fourth connecting portion 54, the internal passage 662 of the pin gripping portion 65 communicates with the recovery passageway 700 penetrating the connecting mechanism 5 and the like. That is, a passage extending linearly along the axis A 1 is formed from the opening end 660 of the bore 661 into which the pin tail 812 is inserted to the opening 140 at the rear end portion of the outer housing 11.

Hereinafter, a method of attaching / detaching the nose assembly 6 to / from the housing 10 will be described.

When removing the nose assembly 6 attached to the housing 10 as shown in FIG. 3, the user rotates the outer sleeve 695 screwed into the nose coupling part 125 with respect to the nose coupling part 125, and Remove from connecting part 125. Thereby, the holding of the inner sleeve 691 and the locking with respect to the locking rib 625 are released. Therefore, the user pulls out the anvil 61 and the inner sleeve 691 forward from the pin gripping portion 65 and the connection mechanism 5, and further removes the pin gripping portion 65 screwed into the fourth connection portion 54. Can be rotated and removed. When attaching the nose assembly 6 to the housing 10, the user may perform the above steps in reverse. The anvil 61 and the inner sleeve 691 are positioned in the direction of the axis A1 by the rear end of the anvil 61 coming into contact with the anvil locking portion 692 of the inner sleeve 691. When the outer sleeve 695 is attached, the locking rib 625 comes into contact with the front end portion 697 of the outer sleeve 695.

Hereinafter, the second portion 113 and the detailed configuration inside the second portion 113 will be described. As shown in FIGS. 2 and 5, the second portion 113 includes a motor 20, a planetary speed reducer 30, an intermediate shaft 25, and a part of a bevel gear mechanism 35 (for details, a first gear member 36 described later). ) And is housed. The planetary speed reducer 30, the intermediate shaft 25, and the bevel gear mechanism 35 are arranged on a power transmission path from the motor 20 to the ball screw mechanism 40, and transmit power in order. Hereinafter, the motor 20, the planetary reduction gear 30, the intermediate shaft 25, and the bevel gear mechanism 35 will be described in order.

As shown in FIGS. 2 and 5, the motor 20 is accommodated in the lower end portion of the second portion 113. In the present embodiment, a small and high output brushless DC motor is employed as the motor 20. The motor 20 is arranged such that the rotation axis A2 of the motor shaft 21 that rotates together with the rotor extends obliquely up and down across the axis A1. More specifically, the rotation axis A2 is inclined backward with respect to the axis A1 as it goes downward. The motor shaft 21 is rotatably supported by a bearing 211 held at the lower end of the second portion 113 and a bearing 213 held at the lower end of the gear housing 34 described later. In the motor shaft 21, a fan 23 for cooling the motor 20 is fixed between the main body (stator and rotor) of the motor 20 and the upper bearing 213.

As shown in FIG. 5, the planetary speed reducer 30 is connected to the upper side of the motor 20 (downstream side in the power transmission path) in the direction of the rotation axis A2. The planetary speed reducer 30 is mainly composed of two sets of planetary gear mechanisms (a first planetary gear mechanism 31 and a second planetary gear mechanism 32) connected in the direction of the rotation axis A2 and a gear housing 34 for housing them. Yes. The gear housing 34 is made of resin and is held in a fixed manner by the second portion 113.

The first planetary gear mechanism 31 is configured with the motor shaft 21 rotating around the rotation axis A2 as an input shaft, and includes a sun gear 311, a plurality of planetary gears 315 supported by the carrier 313, and an internal gear 317. Including. The sun gear 311, the carrier 313, and the internal gear 317 are arranged coaxially with the motor shaft 21. The sun gear 311 is fixed to the upper end portion of the motor shaft 21 (the portion protruding above the bearing 213) and rotates integrally with the motor shaft 21. The plurality of planetary gears 315 mesh with the sun gear 311 and the internal gear 317. The internal gear 317 is fixed to the gear housing 34.

The second planetary gear mechanism 32 includes a sun gear 321, a plurality of planetary gears 325 supported by a carrier 323, and an internal gear 327. The sun gear 321, the carrier 323, and the internal gear 327 are arranged coaxially with the motor shaft 21. The sun gear 321 is fixed to the carrier 313 of the first planetary gear mechanism 31 and rotates integrally with the carrier 313. The plurality of planetary gears 325 mesh with the sun gear 321 and the internal gear 327. The internal gear 327 is fixed to the gear housing 34.

In the planetary reduction gear 30 configured as described above, the sun gear 311 of the first planetary gear mechanism 31 rotates integrally with the motor shaft 21 as the motor 20 is driven. The planetary gear 315 rotates around the rotation axis A2 in the same direction as the motor shaft 21 by revolving around the sun gear 311 while rotating. The same transmission is performed in the second planetary gear mechanism 32, and the carrier 323 rotates in the same direction as the motor shaft 21. In the present embodiment, the carrier 323 is configured as an output shaft of the planetary speed reducer 30. The carrier 323 is formed with a fitting hole 324 having a hexagonal cross section. The fitting hole 324 is configured such that a first end 254 of an intermediate shaft 25 described later can be fitted.

As shown in FIG. 5, the intermediate shaft 25 is configured as a linear member (shaft in which a power transmission member such as a gear is not fixed in the radial direction) extending linearly, and extends in the direction of the rotation axis A 2. Is arranged. In the present embodiment, the intermediate shaft 25 is disposed coaxially with the motor shaft 21 on the upper side of the planetary reduction gear 30 (downstream side in the power transmission path). Of the first end 254 and the second end 256 which are the two ends of the intermediate shaft 25, the first end 254 is formed in a hexagonal cross section corresponding to the fitting hole 324. The intermediate shaft 25 is connected to the planetary speed reducer 30 (carrier 323) by fitting the first end 254 into the fitting hole 324. A bearing 258 is held at the upper end of the gear housing 34 and supports the intermediate shaft 25 in a rotatable manner. The second end portion 256 is also formed in a hexagonal cross section like the first end portion 254.

As shown in FIG. 5, the bevel gear mechanism 35 is mainly configured by a first gear member 36 having a first bevel gear 361 and a second gear member 37 having a second bevel gear 371. In the present embodiment, the bevel gear mechanism 35 is accommodated in the connection region between the first portion 111 and the second portion 113 via the inner housing 12, and the first gear member 36 is disposed at the upper end portion of the second portion 113. On the other hand, the second gear member 37 is disposed at the front lower end portion of the first portion 111.

In the present embodiment, the first gear member 36 includes a first shaft portion 362 and a first bevel gear 361 formed integrally with the first shaft portion 362 at one end portion of the first shaft portion 362. The first gear member 36 is configured such that the first shaft portion 362 extends coaxially with the intermediate shaft 25 in the direction of the rotation axis A2 in a state where the first bevel gear 361 is disposed on the upper side (downstream side in the power transmission path). The

bearings

364 and 366 are rotatably supported. An end portion 367 of the first shaft portion 362 opposite to the first bevel gear 361 protrudes downward from the lower bearing 366 and has the same cross-sectional hexagonal shape as the second end portion 256 of the intermediate shaft 25 described above. Is formed.

The first shaft portion 362 is connected to the intermediate shaft 25 via the connecting sleeve 26. More specifically, the connection sleeve 26 is configured as a cylindrical body having a hexagonal cross section corresponding to the second end portion 256 of the intermediate shaft 25 and the end portion 367 of the first shaft portion 362. The intermediate shaft 25 is coaxially connected to the first shaft portion 362 by fitting the second end portion 256 of the intermediate shaft 25 and the end portion 367 of the first shaft portion 362 to the connecting sleeve 26 from both sides. Has been.

The second gear member 37 includes a second shaft portion 372, a second bevel gear 371 formed integrally with the second shaft portion 372 at one end portion of the second shaft portion 372, and the other end of the second shaft portion 372. And a nut drive gear 38 fixed to the portion. The second gear member 37 is disposed by the

bearings

374 and 376 in a state where the second bevel gear 371 is disposed on the front side and meshes with the first bevel gear 361 and the second shaft portion 372 extends in the direction of the axis A1 (front-rear direction). It is rotatably supported. The nut driving gear 38 is disposed on the rear side of the rear bearing 376 and meshes with the driven gear 411 of the nut 41 described above (see FIG. 3). In the present embodiment, the second bevel gear 371 is formed with a larger diameter than the first bevel gear 361. That is, the bevel gear mechanism 35 has a speed reducing function in addition to the power transmission direction conversion function. The bevel gear mechanism 35 is not necessarily configured as a speed reduction mechanism.

The motor 20, the planetary speed reducer 30, the intermediate shaft 25, and the first gear member 36 of the bevel gear mechanism 35 described above are coaxially arranged on the rotation axis A2. Accordingly, the second portion 113 that accommodates them is formed so as to protrude obliquely downward and rearward from the first portion 111 along the rotation axis A2. Since the intermediate shaft 25 is not provided with a transmission member such as a gear in the radial direction, the intermediate shaft 25 has the smallest radial size compared to the motor 20, the planetary speed reducer 30, and the first gear member 36. Therefore, in the second portion 113, the intermediate region 114 in which the intermediate shaft 25 is disposed includes a lower end first region 115 in which the motor 20 is disposed, a lower end second region 116 in which the planetary reduction gear 30 is disposed, The first gear member 36 is configured to have a smaller diameter than the upper end region 117 where the first gear member 36 is disposed (so that the cross-sectional area of the cross section perpendicular to the rotation axis A2 is small).

Hereinafter, the third portion 118 and the detailed configuration inside thereof will be described. As shown in FIG. 2, the third portion 118 extends rearward (more specifically, obliquely upward and rearward) from the lower end first region 115 of the second portion 113. A battery mounting portion 18 to which the battery 19 can be attached and detached is provided at the rear lower end portion of the third portion 118. In the third portion 118, a controller 28 that controls the motor 20 and the like is accommodated above the battery mounting portion 18.

Since the configurations of the battery mounting portion 18 and the battery 19 are well known, detailed illustration is omitted and a brief description will be given below.

The battery 19 is a rechargeable battery formed in a substantially rectangular parallelepiped shape. The battery 19 has a pair of guide rails, terminals, latches, and buttons. The guide rail is provided on the upper side of the battery 19 so as to extend in the longitudinal direction of the battery 19. The latch and the terminal are provided on the upper surface of the battery 19. The latch is normally urged by a spring (not shown) so as to protrude upward from the upper surface, and is retracted downward from the upper surface by pressing the button. Note that the center of gravity G2 of the battery 19 alone is substantially in the central region of the battery 19. When the battery 19 is mounted on the battery mounting portion 18, the center of gravity G2 is located behind the trigger 150 in the front-rear direction.

The battery mounting portion 18 has a pair of guide grooves, a latch engaging portion, and a terminal. The guide rail of the battery 19 can be slidably engaged with the guide groove. In the present embodiment, the battery 19 is slidably engaged with the battery mounting portion 18 from the rear side. The latch engaging portion is a concave portion that is recessed upward, and is configured so that the latch of the battery 19 can be engaged. The terminal is configured to be electrically connected to the terminal of the battery 19 as the battery 19 is physically engaged with the battery mounting portion 18 by engaging the latch with the latch engaging portion. .

In the present embodiment, as the controller 28, a control circuit composed of a microcomputer including a CPU, a ROM, a RAM, and the like is employed. The controller 28 is electrically connected to the initial position sensor 481 and the rearmost position sensor 482, the container detection switch 70, the switch 151 described later, and the like by wiring not shown.

Hereinafter, the detailed configuration of the handle 15 will be described. As shown in FIG. 2, the handle 15 protrudes downward on the rear side of the second portion 113 so as to face the second portion 113, and is connected to the upper end portion of the third portion 118. In the present embodiment, the handle 15 extends in the direction of the rotation axis A 2 substantially parallel to the second portion 113. The handle 15 includes a grip portion 153 configured to be gripped by a user's finger. In the present embodiment, a region covering the substantially entire length of the handle 15 is the grip portion 153. In the upper end region of the grip portion 153, a trigger 150 capable of a pressing operation (pulling operation) with a finger (usually an index finger) is disposed. A switch 151 that is turned on and off in response to a pressing operation of the trigger 150 by the user is accommodated inside the handle 15.

Further, regarding the arrangement relationship between the second portion 113 extending in the direction of the rotation axis A2 facing the front and back and the handle 15, the planetary reduction gear 30 is arranged in the direction of the rotation axis A2, as shown in FIG. The lower end second region 116 is located at a position substantially corresponding to the lower end region of the grip portion 153. The motor 20 is disposed in the first lower end region 115 that is farther from the first portion 111 than the second lower end region 116 in the direction of the rotation axis A2.

In the fastening tool 1 configured as described above, as shown in FIG. 2, the center of gravity G1 of the fastening tool 1 as a whole when the battery 19 is mounted is slightly in front of the grip portion 153 of the handle 15, and Located slightly below the trigger 150.

Hereinafter, the fastening process of the fastener 8 by the fastening tool 1 will be briefly described with reference to FIGS.

In the initial state where the user does not press the trigger 150 (see FIG. 2), the screw shaft 46 is disposed at the initial position (frontmost position) shown in FIG. In addition, when the output signal of the container detection switch 70 indicates an off state, the controller 28 (see FIG. 2) blinks an LED lamp (not shown) to inform the user that the collection container 7 is not attached. Inform. Further, the controller 28 drives the motor 20 even when the trigger 150 is pressed while the output signal of the container detection switch 70 indicates the off state, and the output signal of the switch 151 (see FIG. 2) indicates the on state. Hold start.

Before the pressing operation of the trigger 150, the user places the fastener 8 in a temporarily fastened state as shown in FIG. 6, and a part of the pin tail 812 is placed inside the pin gripping portion 65 through the tapered portion 622 of the anvil 61. It is inserted into the passage 662. When the trigger 150 is pressed and the switch 151 is turned on, the controller 28 starts the forward drive of the motor 20 (see FIG. 2). The rotational power of the motor 20 is transmitted to the nut 41 via the planetary speed reducer 30, the intermediate shaft 25, and the bevel gear mechanism 35 (see FIG. 2), and the screw shaft 46 is rotated by rotating the nut 41 around the axis A1. It is moved backward from the initial position (frontmost position). Along with this, the pin gripping portion 65 is pulled backward via the coupling mechanism 5 so that the pintail 812 is firmly gripped in a state where the claw of the pin gripping portion 65 is engaged with the pulling groove 813 (see FIG. 1). And pulled back in the axial direction.

As described above, although the outer diameter of the collar 85 is set to be slightly larger than the diameter of the tapered portion 622 of the anvil 61, the pin gripping portion 65 grips the pintail 812 and strongly pulls it back. 85 enters the taper portion 622 while reducing the diameter. Accordingly, the collar 85 is pressed and deformed forward and radially inward in a shape corresponding to the axial direction A1 direction component and the radial direction component of the inclination angle of the tapered portion 622.

When the pin gripping portion 65 is further pulled backward by the screw shaft 46, the collar 85 locked to the anvil 61 deeply enters the tapered portion 622. As a result, the collar 85 is further strongly pressed forward and radially inward, and the inner peripheral surface of the collar 85 is formed on the base portion 816 in a state where the work material W is firmly sandwiched between the collar 85 and the head 83. It is strongly pressure-bonded to the groove 817 (see FIG. 1). As a result, biting due to plastic deformation occurs between the collar 85 and the caulking groove 817, and the caulking of the collar 85 with respect to the shaft portion 81 (base portion 816) is completed.

As described above, the strength of the small diameter portion 811 of the pin 80 is configured to be broken when a larger axial force (tensile force) than that required for crimping the collar 85 to the base portion 816 has a predetermined magnitude. . Therefore, when the screw shaft 46 is further moved rearward after the collar 85 is crimped to the base portion 816, the point at which the tensile force reaches a predetermined magnitude before the screw shaft 46 reaches the rearmost position. Thus, the shaft portion 81 is broken at the small diameter portion 811, and the pin tail 812 is separated from the base portion 816 crimped to the collar 85. In a state where the separated pin tail 812 is gripped by the pin gripping portion 65, when the screw shaft 46 is further moved rearward and reaches the rearmost position as shown in FIG. 7, the magnet 486 is moved to the rearmost position sensor 482. Enter the detection range. The controller 28 stops the backward movement of the screw shaft 46 by stopping the driving of the motor 20. Thereby, the fastening process of the work material W by the fastener 8 is completed.

Thereafter, when the pressing operation of the trigger 150 by the user is released and the switch 151 is turned off, the controller 28 drives the motor 20 in the reverse direction, and the screw shaft 46 is moved to the initial position based on the output signal of the initial position sensor 481. The screw shaft 46 is moved forward until it is determined that the (frontmost position) has been reached. The screw shaft 46 and the pin gripping portion 65 return to the initial positions shown in FIG. 6, and the pin tail 812 can be detached from the pin gripping portion 65. The collection passage 700 allows passage of the pin tail 812 pushed backward by the pin tail 812 of another fastener 8 in the next fastening process or the pin tail 812 released from the engagement by the fastening tool 1 being moved. The collection container 7 accommodates the pintail 812 that has passed through the collection passage 700 and reached the collection container 7.

As described above, in the fastening tool 1 of the present embodiment, the center of gravity of the fastening tool 1 (including both the center of gravity when the battery 19 is not attached and the center of gravity G1 when the battery 19 is attached) is included in the grip portion. Various configurations are employed for bringing the finger 153 close to the finger (particularly the middle finger) (that is, a position slightly in front of the grip portion 153 of the handle 15 and a position slightly below the trigger 150).

First, the housing 10 (outer housing 11) includes a first portion 111 extending in the front-rear direction and a second portion 113 extending in the direction of the rotation axis A2 of the motor shaft 21. The first portion 111 accommodates the relatively heavy drive mechanism 4, while the second portion 113 accommodates the relatively heavy motor 20. In particular, the motor 20 has a lower end portion of the second portion 113 that is located farther from the first portion 111 than the lower end second region 116 corresponding to the lower end region of the grip portion 153 in the direction of the rotation axis A2. One area 115 is arranged. With this configuration, the center of gravity position of the fastening tool 1 can be closer to the vicinity of the finger that grips the grip portion 153 in the direction of the rotation axis A2 than when the motor 20 is disposed close to the first portion 111. .

In the present embodiment, the planetary speed reducer 30 is arranged in the second lower portion second region 116 of the second portion 113 corresponding to the lower end portion region of the grip portion 153 in the rotation axis A2 direction. This arrangement also contributes to bringing the position of the center of gravity of the fastening tool 1 closer to the direction of the finger gripping the grip portion 153 in the direction of the rotation axis A2.

Further, the intermediate shaft 25 is disposed in the power transmission path from the motor 20 to the drive mechanism 4, so that the second portion 113 is provided with an intermediate region 114 having a relatively small diameter. Accordingly, the handle 15 is disposed as far forward as possible while ensuring a space for placing fingers between the grip portion 153 and the second portion 113. With this configuration, the position of the center of gravity of the fastening tool 1 can be brought closer to the vicinity of the finger that grips the grip portion 153 in the front-rear direction as compared with the case where the motor 20 is disposed close to the first portion 111. In the present embodiment, the planetary speed reducer 30 is arranged on the upstream side of the intermediate shaft 25 in the power transmission path, so that the intermediate shaft 25 is rotated at a lower speed than the motor shaft 21. Can be set roughly. For this reason, the intermediate shaft 25 (intermediate region 114) can be made relatively long.

In the present embodiment, the rotation axis A2 is inclined backward with respect to the axis A1 as it goes downward. For this reason, the motor 20 accommodated in the lower end first region 115 is disposed rearward as compared with the case where the rotation axis A2 extends in the vertical direction perpendicular to the axis A1. This arrangement also contributes to bringing the position of the center of gravity of the fastening tool 1 closer to the direction of the finger gripping the grip portion 153 in the front-rear direction.

Furthermore, in the present embodiment, when the battery 19 is mounted on the battery mounting portion 18 provided at the rear lower end portion of the third portion 118 extending rearward from the second portion 113, the center of gravity G2 of the battery 19 is It is located behind the trigger 150 in the direction. The second portion 113 that accommodates the motor 20 and the like is disposed on the front side of the handle 15, whereas the relatively heavy battery 19 is disposed in this manner, so that fastening when the battery 19 is mounted is performed. The center of gravity G1 of the tool 1 can be arranged further rearward, and can be brought close to the vicinity of the finger gripping the grip portion 153. In the present embodiment, the controller 28 disposed in the rear end portion of the third portion 118 also contributes to placing the center of gravity of the fastening tool 1 further rearward and closer to the vicinity of the finger gripping the grip portion 153. ing.

With these configurations, in this embodiment, the center of gravity G1 of the fastening tool 1 as a whole when the battery 19 is mounted is located slightly in front of the grip portion 153 of the handle 15 and slightly below the trigger 150. . For this reason, the fastening tool 1 can exhibit excellent operability regardless of the direction in which the work is performed.

Correspondence between each component of the above embodiment and each component of the present invention is shown below. The fastener 8 is a configuration example corresponding to the “fastener” of the present invention. The pin 80 and the collar 85 are configuration examples corresponding to the “pin” and “tubular body” of the present invention, respectively.

The fastening tool 1 is a configuration example corresponding to the “fastening tool” of the present invention. The axis A1 is a configuration example corresponding to the “predetermined axis” of the present invention. The drive mechanism 4 and the nose assembly 6 (anvil 61 and pin gripping portion 65) are configuration examples corresponding to the “fastening mechanism” of the present invention. The motor 20 and the rotation axis A2 are configuration examples corresponding to the “motor” and the “rotation axis” of the present invention, respectively. The intermediate shaft 25 is a configuration example corresponding to the “intermediate shaft” of the present invention. The housing 10 (outer housing 11) is a structural example corresponding to the “housing” of the present invention. The first portion 111 and the second portion 113 are configuration examples corresponding to the “first portion” and the “second portion” of the present invention, respectively. The handle 15, the grip part 153, and the trigger 150 are configuration examples corresponding to “handle”, “grip part”, and “trigger”, respectively. The upper end region and the lower end region of the grip portion 153 are configuration examples corresponding to the “first end region” and the “second end region” of the present invention, respectively. The lower end second region 116 is a configuration example corresponding to the “predetermined region corresponding to the second end region” of the present invention. The lower end first region 115 is a configuration example corresponding to the “region farther from the first part than the predetermined region” of the present invention.

The planetary speed reducer 30 is a configuration example corresponding to the “planet speed reducer” of the present invention. The bevel gear mechanism 35 is a configuration example corresponding to the “transmission mechanism” and “bevel gear mechanism” of the present invention. The first bevel gear 361 and the second bevel gear 371 are configuration examples corresponding to the “first bevel gear” and the “second bevel gear” of the present invention, respectively. The first shaft portion 362 is a configuration example corresponding to the “shaft portion of the first bevel gear” of the present invention. The connecting sleeve 26 is a configuration example corresponding to the “sleeve” of the present invention. The battery mounting unit 18 and the battery 19 are configuration examples corresponding to “battery mounting unit” and “battery”, respectively.

The above embodiment is merely an example, and the fastening tool according to the present invention is not limited to the configuration of the exemplified fastening tool 1. For example, the changes exemplified below can be added. Note that only one or a plurality of these changes may be employed in combination with the fastening tool 1 shown in the embodiment or the invention described in each claim.

For example, in the above-described embodiment, the fastening tool 1 that can use the breaking type (tearing type) fastener 8 among the multiple member caulking type fasteners is illustrated. However, the present invention provides a fastening tool, a breakable fastener, and a non-breakable fastener that can use a non-breaking fastener that completes a fastening process in a state in which a shaft portion of a pin is maintained as it is. It may be embodied as either a fastening tool that can use both breakable fasteners and a fastening tool that can use blind rivets (blind fasteners). In both the fastening tool 1 and the fastening tool, the fastening mechanism for moving the fastener pin relative to the cylindrical body is not limited to the drive mechanism 4 and the nose assembly 6 illustrated in the above embodiment, and can be changed as appropriate. Is possible.

In the above embodiment, the motor 20 is located farther from the first portion 111 than the lower end second region 116 corresponding to the lower end region of the grip portion 153 in the direction of the rotation axis A 2 in the second portion 113. It is arranged in the lower end first region 115. However, the motor 20 may be disposed in a predetermined region corresponding to the lower end region of the grip portion 153 in the direction of the rotation axis A2 in the second portion 113. For example, when the planetary speed reducer 30 is not employed, the motor 20 may be disposed in the lower end second region 116.

In the above embodiment, the intermediate shaft 25 is coupled to the first shaft portion 362 of the first gear member 36 via the coupling sleeve 26. On the other hand, for example, the intermediate shaft 25 and the shaft portion of the first bevel gear 361 may be integrated as one shaft. That is, one end of one shaft may be connected to the planetary speed reducer 30, and the first bevel gear 361 may be fixed to the other end. In this case, a portion extending downward from a bearing that rotatably supports the shaft adjacent to the first bevel gear 361 is interpreted as a configuration example corresponding to the “intermediate shaft” of the present invention.

Furthermore, in view of the gist of the present invention and the above-described embodiment and its modifications, the following aspects are constructed. The following aspects may be employed in combination with the fastening tool 1 shown in the embodiment, the above-described modified examples, or the invention described in each claim.
[Aspect 1]
The housing includes a third portion extending rearward from an end region on the protruding side of the second portion;
The battery mounting portion may be provided in the third portion.
[Aspect 2]
In aspect 2,
The fastening tool may further include a controller housed in the third portion.
[Aspect 3]
In aspect 1 or aspect 2,
The third portion may be connected to an end of the handle on the protruding side.

1: Fastening tool, 10: Housing, 11: Outer housing, 111: First part, 113: Second part, 114: Intermediate area, 115: Lower end part first area, 116: Lower end part second area, 117: Upper end Part area, 118: third part, 12: inner housing, 122: guide plate, 123: guide hole, 124: guide sleeve, 125: nose connecting part, 13: container connecting part, 140: opening, 141: guide tube 142: Through hole 145: Opening, 15: Handle, 150: Trigger, 151: Switch, 153: Grip part, 18: Battery mounting part, 19: Battery, 20: Motor, 21: Motor shaft, 211: Bearing, 213: Bearing, 23: Fan, 25: Intermediate shaft, 254: First end, 256: Second end, 26: Connection three 28: Controller, 30: Planetary reducer, 31: First planetary gear mechanism, 311: Sun gear, 313: Carrier, 315: Planetary gear, 317: Internal gear, 32: Second planetary gear mechanism, 321: Sun gear 323: carrier, 324: fitting hole, 325: planetary gear, 327: internal gear, 34: gear housing, 35: bevel gear mechanism, 36: first gear member, 361: first bevel gear, 362: first shaft portion 364: bearing, 366: bearing, 367: end, 37: second gear member, 371: second bevel gear, 372: second shaft portion, 374: bearing, 376: bearing, 38: nut drive gear, 4: Drive mechanism, 40: ball screw mechanism, 41: nut, 411: driven gear, 412: bearing, 413: bearin 415: Thrust bearing, 46: Screw shaft, 461: Through hole, 463: Roller shaft, 464: Roller, 47: Extension shaft, 471: Through hole, 48: Position detection mechanism, 481: Initial position sensor, 482: Rear position sensor, 485: magnet holding arm, 486: magnet, 5: connecting mechanism, 51: first connecting portion, 52: second connecting portion, 53: third connecting portion, 54: fourth connecting portion, 6: Nose assembly, 61: anvil, 620: open end, 621: bore, 622: tapered portion, 623: guide portion, 625: locking rib, 65: pin gripping portion, 660: open end, 661: bore, 662: inside Passage, 69: nose holding part, 691: inner sleeve, 692: anvil locking part, 693: flange, 695: outer sleeve, 696: small diameter part, 697: front end part, 69 8: Large diameter part, 7: Collection container, 71: Cylindrical member, 75: Cover member, 70: Container detection switch, 700: Collection passage, 8: Fastener, 80: Pin, 81: Shaft part, 811: Small diameter part , 812: Pin tail, 813: Tension groove, 816: Base part, 817: Clamping groove, 83: Head, 85: Collar, 851: Flange, 852: Engagement part, 86: Hollow part, A1: Axis, A2: Axis of rotation

Claims

A fastening tool for fastening a work material via a fastener including a pin and a cylindrical body,
A fastening mechanism configured to move the pin relative to the cylindrical body along a predetermined axis extending in the front-rear direction of the fastening tool;
A motor that is arranged to extend in a direction intersecting the front-rear direction and that is configured to drive the fastening mechanism;
An intermediate shaft disposed in a power transmission path from the motor to the fastening mechanism and extending in the direction of the rotation axis, which is the direction of extension of the rotation axis;
A first portion that extends in the front-rear direction and accommodates at least a part of the fastening mechanism, and projects from the first portion in a predetermined direction of the rotation axis direction, and accommodates the motor and the intermediate shaft. A housing including at least a second part;
A handle projecting from the first part opposite the second part on the rear side of the second part;
The handle includes a grip portion configured to be gripped by a user's fingers,
The grip portion includes a trigger disposed at a front portion of the first end region on the first part side so that a pressing operation with a finger is possible,
In the second portion, the motor has a predetermined region corresponding to a second end region opposite to the first end region of the grip portion in the rotation axis direction, or more than the predetermined region. The fastening tool is disposed in a region away from the first portion.
The fastening tool according to claim 1,
A fastening tool, further comprising a planetary speed reducer disposed between the motor and the intermediate shaft in the power transmission path.
The fastening tool according to claim 2,
The power transmission path further comprising a transmission mechanism disposed between the intermediate shaft and the fastening mechanism;
The transmission mechanism is configured as a bevel gear mechanism that is disposed coaxially with the intermediate shaft and includes a first bevel gear rotated by the intermediate shaft and a second bevel gear meshing with the first bevel gear. The fastening tool according to claim 2.
The fastening tool according to claim 3,
The fastening tool according to claim 1, wherein the intermediate shaft is connected to a shaft portion of the first bevel gear through a sleeve.
The fastening tool according to any one of claims 1 to 4,
The fastening tool according to claim 1, wherein the rotation shaft of the motor extends obliquely rearward in the predetermined direction with respect to the predetermined axis extending in the front-rear direction.
The fastening tool according to any one of claims 1 to 5,
The fastening tool is:
A battery mounting portion provided on the housing or the handle;
A battery removably mounted on the battery mounting portion;
A fastening tool, wherein the center of gravity of the battery is located behind the trigger in the front-rear direction.
The fastening tool according to claim 6,
The center of gravity of the fastening tool when the battery is attached is located on the opposite side of the first portion with respect to the trigger and in the vicinity of the trigger in the extending direction of the handle. Fastening tool to do.
The fastening tool according to claim 6 or 7,
The housing includes a third portion extending rearward from an end region on the protruding side of the second portion;
The battery mounting portion is provided in the third portion, and is a fastening tool.
The fastening tool according to claim 8,
The fastening tool further comprising a controller housed in the third portion.
The fastening tool according to claim 8 or 9, wherein
The fastening tool according to claim 3, wherein the third portion is connected to an end of the handle on a protruding side.