JPH11138457A - Nut fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve maintenance performance in a nut fastening device capable of performing screwing work by a driving source and confirming of fastening torque. SOLUTION: In a nut fastening device, a motor unit 5 including a motor 18 and a battery 19 is detachably attached to a main body part 2 by using a torque wrench 1 at stores, formed by pivotally supporting a head part 4 on the main body part 2 through a pivot 3 and capable of confirming fastening torque, and a socket driving unit 6 including a gear train 63 and an open-end socket 46 is detachably attached to the head part 4. In this case, power transmission from the motor unit 5 to the socket driving unit 6 is performed through a universal joint 22 positioned on the extension axis of the pivot 3, and a socket 21 and a hexagon shaft 62 to be fitted to each other so as to be freely separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut tightening device for tightening a nut with a predetermined torque.

[0002]

2. Description of the Related Art Conventionally, a manual torque wrench for tightening a nut by manual operation and generating a sound when the tightening torque reaches a predetermined value to notify completion of the tightening has been known. Further, a combination of a manual torque wrench and a nut runner so that screw tightening by a driving source and manual screw tightening can be performed is known from Japanese Patent Application Laid-Open No. Hei 7-24745.

[0003]

In the case of performing a tightening operation of a nut which requires confirmation of the tightening torque, if the above-mentioned conventional manual torque wrench is used, much time is required for the operation and the work efficiency is low. There is a problem. In addition, the above-mentioned JP-A-7
The use of the device described in Japanese Patent No. 24745 allows the screwing operation by the drive source and the confirmation of the tightening torque, thereby improving the working efficiency. However, this device requires special consideration for maintenance and repair. However, there is a problem that maintenance and repair require a lot of time.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to improve the maintenance performance of a nut tightening device capable of confirming a tightening torque and a screw tightening operation by a driving source. .

[0005]

Means for Solving the Problems In order to achieve the above object, an invention according to claim 1 includes a main body and a head pivotally supported by the main body. When a torque equal to or more than a predetermined value acts on the manual torque wrench, the head portion swings at a predetermined angle with respect to the main body portion to notify completion of tightening of the nut, and a motor driven by a battery is provided. A motor unit detachably attached to the main body, and a socket drive unit detachably attached to a head portion of the manual torque wrench having an open end socket that is rotationally driven by the motor unit, The motor unit and the socket drive unit can transmit power without hindering swinging of the head with respect to the main body of the manual torque wrench. , And the and characterized in that it is connected via a mutually separable joints.

According to the above construction, a motor unit is removably mounted on the main body of the manual torque wrench having a main body pivotally supported on the head, and a socket drive unit is removably mounted on the head. Since the motor unit and the socket drive unit are connected via a joint capable of transmitting power without disturbing the swinging of the head portion with respect to the main body portion of the manual torque wrench and being separable from each other, the motor Not only can the nut be quickly tightened by rotating the open end socket of the socket drive unit with the driving force, but also the function of the manual torque wrench can be achieved by grasping the motor unit and swinging the socket drive unit manually. To tighten the nut and check the tightening torque. Becomes possible, convenience is greatly improved. Further, since the motor unit and the socket driving unit can be detached independently from the manual torque wrench, maintenance and replacement of the manual torque wrench, the motor unit and the socket driving unit can be performed efficiently and at low cost.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the head portion of the manual torque wrench has a nut engaging portion engageable with a hexagonal portion of the nut. The socket drive unit is engaged with and fixed to a nut engagement portion of the head portion.

According to the above construction, the socket drive unit is fixed using the nut engaging portion provided on the head of the manual torque wrench, so that the socket drive unit can be easily and firmly fixed to the head. Can be.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the joint can be bent on an axis of a pivot for pivotally supporting a head portion on a main body portion of the manual torque wrench. It is a universal joint.

According to the above configuration, the universal joint that can be bent on the axis of the pivot for pivotally supporting the head is used as a joint in the main body of the manual torque wrench, so that the angle formed by the main body and the head is reduced. Even if it changes, smooth power transmission can be performed.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the motor unit includes a motor and a battery for driving the motor.

According to the above configuration, since the motor unit includes the motor and the battery, the motor can be driven cordlessly, and the convenience is improved.

According to a fifth aspect of the present invention, in addition to the first aspect, a ratchet mechanism is interposed between a gear train transmitting the rotation of the motor to the open-end socket and the housing of the socket drive unit. The ratchet mechanism is slipped to allow rotation of the open end socket with respect to the housing in the nut tightening direction, and the ratchet mechanism is engaged to restrict rotation of the open end socket with respect to the housing in the nut loosening direction. It is characterized by the following.

According to the above configuration, when the motor is driven to rotate the open end socket in the nut tightening direction, the ratchet mechanism slips and the rotation of the open end socket relative to the housing in the nut tightening direction is allowed. When the motor is stopped and the motor unit and the socket drive unit are manually swung in one direction, the ratchet mechanism is engaged and the rotation of the open-end socket in the nut loosening direction with respect to the housing is regulated. The nut can be tightened by transmitting the torque in the nut tightening direction to the socket, and when the motor unit and socket drive unit are manually swung in the other direction, the ratchet mechanism slips and the nut loosens from the housing to the open end socket. Can be prevented from being transmitted. This makes it possible to retighten the nut only by reciprocating the motor unit and the socket drive unit, thereby improving workability.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, when the open end socket rotates in the nut loosening direction with respect to the housing, the notch is located at a predetermined position. And a stopper for stopping the open end socket, wherein the ratchet mechanism is disengaged when the open end socket rotates with respect to the housing in a nut loosening direction.

According to the above configuration, when the motor is driven to rotate the open end socket in the nut loosening direction, the ratchet mechanism is disengaged, and the driving of the motor in the nut loosening direction is allowed. When the open-end socket rotates in the nut loosening direction and the notch of the open-end socket reaches a predetermined position, the stopper forcibly stops the rotation of the open-end socket.
The notch can be reliably stopped at a predetermined position.

According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, an operation member for instructing forward rotation, stop, and reverse rotation of the motor is provided, and the operation member is moved to a position for instructing reverse rotation of the motor. The ratchet mechanism is disengaged in conjunction with the operation of the operation member.

According to the above configuration, when the operation member is operated to reversely drive the motor, the ratchet mechanism is automatically disengaged, so that there is no need to specially perform the disengagement operation of the ratchet mechanism. Is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view showing an assembled state of a nut tightening device.
FIG. 2 is a perspective view of the nut tightening device in an exploded state, and FIG.
4 is an enlarged view of a main part of FIG. 1, FIG. 4 is a longitudinal sectional view of the socket drive unit, FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, and FIG.
FIG. 6 is a sectional view taken along line -6.

As shown in FIGS. 1 and 2, the nut tightening device of this embodiment is composed of three units that can be disassembled and assembled. The first unit is a commercially available manual torque wrench 1 and includes a main body 2 constituting a grip, and a head 4 pivotally supported at the tip of the main body 2 via a pivot 3 so as to swing freely. . Head portion 4 consists called open-end socket, one end is engageable with opened nut engaging portion 4 ₁ hex nut (or bolt hexagonal head). When the nut is tightened by gripping the main body 2 in a state where the head 4 is engaged with the hexagonal portion of the nut, when the tightening torque reaches a predetermined value set in advance, the main body 2 and the snapping sound are generated. Head part 4 is a robot 3
By swinging around a predetermined angle, the operator is notified of the completion of the tightening. Since the manual torque wrench 1 is a commercially available product that is generally available, a description of its structure is omitted.

The second unit is a motor unit 5, which is detachably fixed to the main body 2 of the manual torque wrench 1. The third unit is a socket drive unit 6, which is detachably fixed to the head 4 of the manual torque wrench 1. The socket drive unit 6 is driven by the motor unit 5 and tightens the nut with the driving force of a motor described later. Hereinafter, the structures of the motor unit 5 and the socket drive unit 6 will be described in detail.

Next, the configuration of the motor unit 5 will be described with reference to FIGS. A substantially cylindrical casing 11 constituting a grip to be gripped by an operator is provided with a front fixing device 12.
And, it is detachably fixed to the main body 2 of the manual torque wrench 1 via the rear fixture 13. The front fixture 12 is fitted to the front of the main body 2 of the manual torque wrench 1 having a rectangular cross section, and is fixed to the casing 11 with four bolts 14. Further, the rear fixing member 13 is fitted to the rear portion of the main body 2 of the manual torque wrench 1 having a circular cross section, and is tightened with two bolts 15, 15.
To the casing 11.

Inside the casing 11, a motor 18 integrally provided with a speed reducer 17 and a rechargeable battery 19 for driving the motor 18 are housed. Casing 1
A socket 21 having a hexagonal hole is provided via a universal joint 22 at the distal end of the output shaft 20 of the speed reducer 17 projecting forward from the front end of the first gear 1. The intersection of the two pins 23 of the universal joint 22 is located on an extension of the pivot 3 that pivotally supports the main body 2 and the head 4 of the manual torque wrench 1.

Next, the configuration of the socket drive unit 6 will be described with reference to FIGS.

The socket drive unit 6 has a housing 41 detachably fixed to the head 4 of the manual torque wrench 1. The housing 41 includes an upper housing 41U, a center housing 41C, and a lower housing 41L which are stacked in three stages to form six bolts 40 (FIG. 5).
(See Reference). A nut engaging portion 4 of the head portion 4 of the manual torque wrench 1 is provided in the lower housing 41L.
A fixing projection 41 ₁ that fits into ₁ and two fixing pins 42 and 43 that can be engaged with the outer peripheral surface of the head portion 4 are provided. Therefore, the fixing projection 4 of the lower housing 41L is provided.
1 ₁ and the locking pins 42, 43 Manual torque wrench 1
The holding plate 44 and the fixing projections 4 contacting the lower surface of the head portion 4 in a state of being engaged with the head portion 4 from above.
1 ₁ center housing 41C bolts 45 passing through the
, The housing 41 of the socket driving unit 6 is detachably and firmly fixed to the head unit 4.

[0027] distal end of the lower housing 41L, provided with a socket gear 46 ₁ in the outer circumference, rotatably supported open-ended socket 46 having a U-shaped cutout 46 ₂ which opens in the side surface about the axis of the vertical direction Is done. When U-shaped notch 46 ₂ open-ended socket 46 is open toward the front, U overlaps with the notch 46 ₂
Shaped notch 41 ₂ is formed on the tip of the lower housing 41L.

[0028] As apparent from FIG. 5, the lower housing 4 to face the notch 46 ₂ open-ended socket 46
Internal to the forming roller guide groove ₄₆₃ of the 1L, roller 48 which is biased in the direction to protrude the notch 46 in the ₂ by a spring 47 are housed. Open end socket 46
When notch 46 ₂ to fitting the hexagonal portion N ₁ of the nut N, the roller 48 is hexagonal portion N ₁ of the nut N submerged retreat inside the roller guide groove ₄₆₃ while compressing the spring 47
Is allowed to pass. In this state, when the open end socket 46 is rotated in the tightening direction indicated by the arrow a in FIG.
The roller 48 is caught between the hexagonal portion N ₁ and the notch 46 ₂ of the nut N, it is possible to transmit the torque of the open-ended socket 46 to the hexagonal portion N ₁ of the nut N is tightened the nut N. Conversely, rotating the loosening direction indicated by an open-ended socket 46 by an arrow b, the roller 48 is submerged retreat inside the roller guide groove ₄₆₃ while compressing the spring 47 against the nut N of the open-ended socket 46 Slip while slipping. The details of the structure of the open-end socket 46 are described in JP-A-7-186.
No. 059 discloses this in detail.

The socket of the open end socket 46
Togear 46₁The lower housing 41L has a rotating shaft 4
A pair of auxiliary gears 50, 50 supported via 9, 49
Mesh with each other, and the pair of auxiliary gears 50, 50
The upper housing 41U via the bearing 51
The intermediate gear 53 integral with the rotating shaft 52 supported
I do. The rotation of the intermediate gear 53 is controlled by a pair of auxiliary gears 50, 50.
Through the socket gear 46₁To one of the
One of the auxiliary gears 50, 50 is a socket gear 46.₁Notch 4
6_TwoThe other auxiliary gear 50, 50
Socket gear 46 ₁The driving force can be transmitted to the motor.

A driven bevel gear 54 integrally connected to the upper portion of the intermediate gear 53 has an input shaft 55
The drive bevel gear 56 integrally formed at the tip of the gear meshes with the gear. The input shaft 55 is supported on the upper housing 41U by a pair of front and rear bearings 57 and 58, and is positioned in the front and rear direction by two collars 59 and 60 and a clip 61. The universal joint 2 is attached to the rear end of the input shaft 55 projecting from the rear end surface of the upper housing 41U.
A hexagonal shaft 62 that can be fitted to the second socket 21 is integrally connected.

Thus, the speed reducer 1 connected to the motor 18
7 is rotated by the universal joint 2
2, the socket 21, the hexagonal shaft 62, the input shaft 55, driving bevel gear 56, driven bevel gear 54, is transmitted to the socket gear 46 ₁ through the intermediate gear 53 and the auxiliary gear 50, 50, the forward direction of the open-end socket 46 ( Nut N fastening direction) and reverse direction (nut N loosening direction)
Is driven to rotate. The driving bevel gear 56, driven bevel gear 54, intermediate gear 53, the auxiliary gear 50, 50 and socket gear 46 ₁ constitutes the gear train 63 of the present invention.

A button integrally formed on the upper portion of the intermediate gear 53
Notch 71 on one side of the₁Is formed, and this
Notch 71₁One end of the stopper 72 is pivotally supported by the pin 73.
It is. The stopper 72 is urged by a spring 74.
And a recess 41 with which the other end can be engaged._ThreeIs Center House
Formed on the ring 41C. Therefore, the intermediate gear 53 shown in FIG.
When rotating in the direction of arrow c of FIG.
The recess 41 of the housing 41 _ThreeTo slip against
Therefore, the rotation of the intermediate gear 53 in the direction of the arrow c does not hinder the rotation.
Done. Conversely, the intermediate gear 53 rotates in the direction of arrow d.
And the other end of the stopper 72 is_Three
To lock the intermediate gear 53 so that it cannot rotate.
Notch 46 of open end socket 46_TwoAnd c
Notch 41 of housing 41_TwoCoincide with each other and both notches 46
_Two, 41_TwoOverlap.

A swing lever 76 is provided between the center housing 41C and the upper housing 41U via a pin 75.
Is pivotally supported at an intermediate portion of the robot. The switch 7 of the motor 18 is provided on the front side surface of the casing 41 of the motor unit 5.
7 is provided, one end of the swing lever 76 and the knob 77 ₁ of the switch 77 is pivotally supported by respective pins 79, 80 at opposite ends of the operating member 78. Incidentally, when separating the motor unit 5 and the socket drive unit 6, it is possible to remove the rear end of the operating member 78 from the pin 80 of the knob 77 of _the switches 77 (see FIG. 2).

The ratchet wheel 81 between the driven bevel gear 54 and the boss portion 71 is fixed integrally pawl 82 with ratchet teeth 81 ... ratchet pawl 82 ₁ engageable with the ratchet wheel 81 to one end Are pivotally supported between the center housing 41C and the upper housing 41U by pins 83. The ratchet pawl 82 is biased by a spring 84 in a direction in which the ratchet pawl 82 ₁ engages with the ratchet teeth 81 ₁ ... Of the ratchet wheel 81. And center housing 4
The front and rear ends of a push rod 85 slidably supported in the front-rear direction between 1C and the upper housing 41U contact the other end of the ratchet pawl 82 and the other end of the swing lever 76, respectively.

An operation member 78 for controlling the rotation of the motor 18
Are three of the forward rotation position, the stop position, and the reverse rotation position shown in FIG.
Position can be selected, and when it is operated to the forward rotation position, the open end socket 46 is rotated in the forward rotation direction (the nut N).
The motor 19 is driven so as to rotate in the
When operated to the stop position, the motor 18 stops, and when operated to the reverse rotation position, the motor 19 is driven so that the open end socket 46 rotates in the reverse rotation direction (the direction in which the nut N is loosened).

When the operating member 78 is at the normal rotation position or the stop position, the swing lever 76 swings in the direction of arrow e in FIG. 6, so that the ratchet pole 82 released from the restraint by the push rod 85 The ratchet claw 82 ₁ swings in the direction of arrow g by the resilience, and its ratchet claw 82 ₁ has ratchet teeth 81 ₁ of the ratchet wheel 81. Engages. As a result, the rotation of the intermediate gear 53 in the direction of arrow d in FIG. 5 is restricted. On the other hand, when the operating member 78 is at the reverse rotation position, the swing lever 76 swings in the direction of arrow f in FIG. 6, so that the ratchet pawl 82 pressed by the push rod 85 resists the elastic force of the spring 84. swings in the direction of arrow h, the ratchet pawl 82 ₁ is disengaged from the ratchet teeth 81 ₁ ... of the ratchet wheel 81. As a result, rotation of the intermediate gear 53 in the direction of arrow d in FIG. 5 is allowed.

Next, the operation of the embodiment of the present invention having the above-described configuration will be described.

To perform the tightening work of the nut N, first,
Notch 46 of open end socket 46 _TwoShould be tightened
The nut 48 is fitted from the side, and the roller 48 and the notch 46_Two
And a nut N. In this state, the operation member 78
Is operated from the stop position to the forward rotation position.
The motor 18 is driven to rotate forward by the supplied electric power,
8 is universal from the output shaft 20 of the reducer 17
Joint 22, socket 21, hexagon shaft 62, input shaft 5
5, drive bevel gear 56, driven bevel gear 54, intermediate gear
Gear 53 through the gear 53 and the auxiliary gears 50, 50.
46₁To the open end socket 46
Drive in the direction.

At this time, as described above, the ratchet pawl 82 ₁ of the ratchet pole 82 is
Ratchet teeth 81 ₁ … , But the ratchet pawl 82 ₁ of the ratchet pawl 82 rotates in the direction of arrow c in FIG.
₁ … , The intermediate gear 53 (that is,
The rotation of the open end socket 46) in the normal rotation direction is allowed. The open-end socket 46 is rotated in the forward direction, the nut N, which is engaged with the notch 46 ₂ by the roller 48 is tightened is driven in the normal direction.

When the tightening of the nut N by the driving force of the motor 18 reaches the limit, the operation member 78 is returned to the stop position to stop the driving of the motor 18, and then the motor unit 5 is grasped and the arrow i in FIG. The nut N is tightened more manually by reciprocating swinging in the direction and the arrow j direction. When the motor unit 5 is swung in the direction of arrow i in FIG. 1, the ratchet wheel 81 tries to rotate in the direction of arrow d in FIG. 6, but its ratchet teeth 81... Engage with the ratchet pawl 82 ₁ of the ratchet pole 82. Since the ratchet wheel 81 is stopped, the ratchet wheel 81 is locked by the housing 41 so as not to rotate, so that the tightening is possible.

When the motor unit 5 is swung in the direction of arrow j in FIG. 1, the ratchet wheel 81 tries to rotate in the direction of arrow c in FIG.
Ratchet pawl 82 ₁ is to overcome the ratchet teeth 81 ... of the ratchet wheel 81, the swing of the arrow j direction of the motor unit 5 is carried out without any trouble. as a result,
It is possible to retighten the nut N simply by swinging it back and forth without removing the open end socket 46 from the nut N, so that a so-called quick wrench function is exerted and workability is improved.

When retightening the nut N by the manual operation described above, the main body 2 of the manual torque wrench 1 supporting the motor unit 5 and the head 4 of the manual torque wrench 1 supporting the socket drive unit 6 are connected. When the torque acts on the pivot 3 to be pivoted and the torque reaches a preset value, that is, when the tightening torque of the nut N reaches a predetermined value, the head 4 of the manual torque wrench 1 is moved to the main body 2.
Swings around the pivot 3 and makes a clicking sound to notify the worker of the completion of the tightening. When the head 4 of the manual torque wrench 1 swings with respect to the main body 2 in this manner,
The motor unit 5 supported by the main body 2 and the socket drive unit 6 supported by the head unit 4 relatively swing, but the universal joint 22 connecting the motor unit 5 and the socket drive unit 6 is connected to the pivot 3. Since it is arranged on the axis line, an excessive load is prevented from being applied to the universal joint 22 due to the swing.

Subsequently, the open end socket 46 is driven in the reverse direction by operating the operation member 78 to the reverse position and driving the motor 18 in the reverse direction. At this time, the ratchet pawl 82 ₁ of the ratchet pawl 82 is moved to the ratchet wheel 81 in conjunction with the operation of the operation member 78 to the reverse position.
Ratchet teeth 81 ₁ … , The rotation of the intermediate gear 53 (that is, the open end socket 46) in the reverse direction is allowed. Open end socket 4
When 6 is reversed, the roller 48 is submerged retreat inside the roller guide groove _463, the open-ended socket 46 is prevented from the nut N is loosened slipping the nut N. The open-end socket 46 is rotated by a predetermined angle, the notch 4 of the notch 46 ₂ housing 41
When overlapping 1 _2, the stopper 72 provided in the boss portion 71
Intermediate gear 53 but engage in a recess 41 ₃ of the housing 41
The rotation of the open end socket 46 in the reverse direction is forcibly stopped. And Thus, it is possible from the notch 41 ₂ which notches 46 ₂ and the housing 41 of the open-ended socket 46 which overlap each other, to easily disengage the nut N.

As described above, the commercially available manual torque wrench 1
A simple structure in which the motor unit 5 and the socket drive unit 6 are attached to the main unit 2 and the head unit 4, respectively, for quick tightening of the nut N by the motor 18, and confirmation of additional tightening and tightening torque by the manual torque wrench 1. And convenience can be greatly improved. The motor unit 5 can be removed from the main body 2 of the manual torque wrench 1 only by loosening the eight bolts 14, 16... Of the front fixture 12 and the rear fixture 13. Since the manual torque wrench 1 can be removed from the head portion 4 only by loosening one bolt 45, and the motor unit 5 and the socket drive unit 6 can be separated at the socket 21 and the hexagonal shaft 62, Maintenance and replacement of the manual torque wrench 1, the motor unit 5, and the socket drive unit 6 can be performed extremely efficiently. In addition, when any one of the manual torque wrench 1, the motor unit 5, and the socket drive unit 6 fails, only the failed part can be easily replaced, which is advantageous in terms of cost. Furthermore, since the battery 19 is provided integrally with the motor unit 5, cordless operation becomes possible and convenience is improved.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the nut tightening device of the present invention is not limited to the tightening of the nut N, but can be applied to the tightening of a bolt having a hexagonal head.

[0047]

As described above, according to the first aspect of the present invention, the motor unit is detachably mounted on the main body of the manual torque wrench having the main body pivotally supported by the head. The socket drive unit is detachably attached to the unit, and furthermore, the motor unit and the socket drive unit can transmit power without hindering the swinging of the head unit with respect to the main body of the manual torque wrench, and can be separated from each other. Not only can the drive end of the motor drive of the motor unit rotate the open-end socket of the socket drive unit to quickly tighten the nut, but also grasp the motor unit and swing the socket drive unit manually. By moving the nut, the function of the manual torque wrench is exhibited to tighten the nut. It is possible to perform the confirmation of the tightening torque and convenience is greatly improved. Further, since the motor unit and the socket driving unit can be detached independently from the manual torque wrench, maintenance and replacement of the manual torque wrench, the motor unit and the socket driving unit can be performed efficiently and at low cost.

According to the second aspect of the present invention,
Since the socket drive unit is fixed using the nut engaging portion provided on the head portion of the manual torque wrench, the socket drive unit can be easily and firmly fixed to the head portion.

According to the third aspect of the present invention,
By using a universal joint that can be bent on the axis of the pivot that supports the head on the main body of the manual torque wrench as a joint, smooth power transmission is possible even if the angle formed by the main body and the head changes. It can be carried out.

According to the fourth aspect of the present invention,
Since the motor unit includes the motor and the battery, the motor can be driven cordlessly, and the convenience is improved.

According to the fifth aspect of the present invention,
When the motor is driven to rotate the open end socket in the nut tightening direction, the ratchet mechanism slips and the rotation of the open end socket with respect to the housing in the nut tightening direction is permitted. When the motor is stopped and the motor unit and the socket drive unit are manually swung in one direction, the ratchet mechanism is engaged and the rotation of the open-end socket in the nut loosening direction with respect to the housing is regulated. The nut can be tightened by transmitting the torque in the nut tightening direction to the socket, and when the motor unit and socket drive unit are manually swung in the other direction, the ratchet mechanism slips and the nut loosens from the housing to the open end socket. Can be prevented from being transmitted. This makes it possible to retighten the nut only by reciprocating the motor unit and the socket drive unit, thereby improving workability.

According to the invention described in claim 6,
When the motor is driven to rotate the open end socket in the nut loosening direction, the ratchet mechanism is disengaged, and the driving of the motor in the nut loosening direction is allowed. When the open end socket rotates in the nut loosening direction and the notch of the open end socket reaches a predetermined position, the rotation of the open end socket is forcibly stopped by the stopper, so that the notch is reliably stopped at the predetermined position. be able to.

According to the seventh aspect of the present invention,
When the operation member is operated to rotate the motor in the reverse direction, the ratchet mechanism is automatically disengaged, so that there is no need to perform a special disengagement operation of the ratchet mechanism, thereby improving operability.

[Brief description of the drawings]

FIG. 1 is a perspective view of an assembled state of a nut tightening device.

FIG. 2 is a perspective view of the nut tightening device in an exploded state.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is a longitudinal sectional view of a socket drive unit.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Manual torque wrench 2 Body part 3 Pivot 4 Head part 4 ₁ Nut engagement part 5 Motor unit 6 Socket drive unit 18 Motor 19 Battery 22 Universal joint (joint) 41 Housing 46 Open end socket 46 ₂ Notch 63 Gear train 72 Stopper 78 Operating member 86 Ratchet mechanism N Nut N ₁ Hex

Claims (7)

[Claims] An electronic device comprising a main body (2) and a head (4) pivotally supported by the main body (2), wherein a torque equal to or greater than a predetermined value is applied between the main body (2) and the head (4). When actuated, the head part (4) swings by a predetermined angle with respect to the main body part (2), and the manual torque wrench (1) notifies the completion of the tightening of the nut (N).
A motor unit (5) including a motor (18) driven by a battery (19) and removably attached to a main body (2) of the manual torque wrench (1); A socket drive unit (6) having an open-end socket (46) that is rotatably driven and removably attached to the head (4) of the manual torque wrench (1). 5) and the socket drive unit (6)
The power can be transmitted without hindering the swing of the head portion (4) with respect to the main body portion (2) of the manual torque wrench (1), and the manual torque wrench (1) is connected via a separable joint (22). A nut tightening device. 2. The head portion (4) of the manual torque wrench (1) includes a nut engaging portion (4 ₁ ) capable of engaging with a hexagonal portion (N ₁ ) of a nut (N), and the socket is provided. The drive unit (6) is provided with a nut engaging portion (4) of the head portion (4).
_{2. The} method according to claim 1, wherein the first and second members are engaged with each other and fixed.
2. The nut tightening device according to item 1. 3. The joint (22) is a universal joint that can be bent on the axis of a pivot (3) pivotally supporting a head (4) on a main body (2) of the manual torque wrench (1). 2. The nut tightening device according to claim 1, wherein the nut tightening device is provided. 4. The motor unit (5) includes a motor (1).
8) and a battery (1) for driving the motor (18).
The nut tightening device according to claim 1, further comprising (9). 5. A ratchet mechanism (86) between a gear train (63) for transmitting the rotation of the motor (18) to the open end socket (46) and a housing (41) of the socket drive unit (6). The ratchet mechanism (86) is slipped to allow rotation of the open end socket (46) in the nut tightening direction with respect to the housing (41), and the ratchet mechanism (8) is rotated.
The nut tightening device according to claim 1, wherein the nut (6) is engaged to restrict rotation of the open end socket (46) in the nut loosening direction with respect to the housing (41). 6. The open end socket (46) such that when the open end socket (46) rotates in the nut loosening direction with respect to the housing (41), the notch (46 ₂ ) is at a predetermined position. A stop (72) for stopping the ratchet mechanism (86).
The nut tightening device according to claim 5, wherein the engagement is released when the open end socket (46) rotates in the nut loosening direction with respect to the housing (41). 7. An operation member (78) for commanding forward rotation, stop and reverse rotation of a motor (18) is provided.
The nut tightening device according to claim 6, wherein the ratchet mechanism (86) is disengaged in conjunction with the operation of the operation member (78) to the position for instructing the reverse rotation of (8).