JPH0542485A - Tightening and loosening device for bolt and nut - Google Patents

Abstract

PURPOSE:To easily fit the angle direction of a socket to a bolt head part by providing a play in the engaging part between the engaging hole part of a clutch member and the top end part of an output shaft so that a transmitting member is rotatable at a determined angle to the output shaft. CONSTITUTION:The square end part 11a of the output shaft of a motor is fitted to and engaged with a clutch member 6O having an engaging hole part 16 in such a manner as to be capable of transmitting rotation, and a driving gear 14 for transmitting the rotation of the output shaft 11 to a socket 20 engaged with a bolt head part is engagingly connected to the clutch member 60. In the engaging part between the engaging hole part 16 in the clutch member 60 and the square end part 11a of the output shaft 11, a play 17 is provided so that the driving gear 14 can be rotated within a desired angle range, and the clutch member 60 is made removable. Since the angle directional positioning of a socket 20 to the bolt head can be performed with a simple manual operation without driving the motor, thus, the working efficiency is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt / nut tightening / loosening device used for fastening steel frames or shaped steels of various structures with bolts or nuts.
The present invention relates to a bolt and nut tightening / loosening device in which a reaction force receiver is attached to a casing equipped with a transmission member that drives a socket that engages a bolt head or a nut.

[0002]

2. Description of the Related Art Conventionally, in an electric tightening device such as a nut runner used for tightening and tightening bolts and nuts, a strong reaction force is applied during tightening. A reaction force receiver is provided on the main body of the apparatus so as not to act on the grip portion, and the reaction force receiver is brought into contact with a part of a structure such as a mold steel for tightening. As a result, the reaction force can be released to the structure, and the reaction force is prevented from being transmitted to the operating grip portion.

FIG. 6 shows a form of such a tightening / loosening device.
As shown in FIG. 5, the casing 111 of the transmission portion for driving the socket 114 for engaging the bolt head B or the nut or the like at the lower end portion of the device main body 110 has a reaction force receiving portion extending parallel to the axial center of the socket 114. There are some with 124 attached.

The reaction force receiving member 124 is provided in the casing 11
1 and a protruding fixing portion 120 fixed to the
The contact plate 123 is attached to the inside of 20 by screwing means.

When the bolt is tightened or loosened, the bolt head B is engaged with the socket 114, and the contact surface 121 of the contact plate 123 and the end surface 151 of the structure 150 are contacted with each other. As a result, as described above, the reaction force can be released to the structure 150, and the reaction force is not transmitted to the operating grip portion.

This type of nut runner is preferably used when the bolt head B to be tightened is located at a position at a constant distance from the end surface of the structure. The contact surface of the reaction force receiver and the socket are used. The distance from the axis is set to match the distance.

In the case of the tightening device in which the reaction force receiver is fixed to a part of the casing 111 as described above, since the reaction force receiver 124 and the socket 114 are substantially integrated, the structure is reduced. Due to the contact of the reaction force receiving member 124 with the end surface 151 of the object 150, the direction of the apparatus main body is restricted.

Therefore, when the engaging groove formed on the inner periphery of the socket 114 does not coincide with the angular direction of the corner of the bolt head that is temporarily fixed or tightened to a structure such as a mold steel, the main body of the apparatus is It is not possible to align and fit the socket 114 to the bolt head B by rotating 110.

That is, in correspondence with the square shape of the bolt head B such as a hexagon, the inner circumference of the socket 114 engaged with the bolt head B has an integral multiple of the number of angles of the bolt head B, for example, a hexagonal bolt. In this case, the engaging groove with which the six corners of the bolt head B are engaged is formed every 30 °, but the angle between the engaging groove of the socket 114 and the corner of the bolt head B is deviated. In this case, since the device body 110 cannot be rotated, the socket 114 cannot be fitted into the bolt head B.

However, the conventional tightening / loosening device such as the nut runner of this type is not provided with means for adjusting the deviation in the angular direction.

Therefore, in order to match the angular direction of the engagement groove of the socket 114 with the square shape of the bolt head B to be tightened, for example, a motor is intermittently driven by a switch operation, so that the socket 114 is tightened. Is adjusted so as to match the bolt head B, but it is difficult to work with such means and the workability is poor, and the motor switch and socket 114 are easily damaged, and There was a problem that it deteriorated.

[0012]

[Means for Solving the Problems] Therefore, in order to solve the above problems, the following means were taken. A bolt and nut tightening / loosening device of the present invention is a tightening / loosening device in which a reaction force receiver is attached to a device body, and a tip end portion of an output shaft of a motor as a drive source has an engaging hole portion. A transmission member fitted into a member and engaged with it so as to be capable of rotation transmission, and having a socket attached to a bolt head or a nut is fitted into the clutch member so as to be engaged therewith for rotation transmission, and the clutch member At the engaging portion between the engaging hole portion and the tip end portion of the output shaft, play is provided for rotating the transmission member within a predetermined angle range, and the clutch member is provided at the tip end portion of the output shaft and the transmission member. It is more detachably provided.

It is preferable that a part of the transmission member is provided with an operation portion piece that can penetrate the casing and rotate the transmission member within the play.

[0014]

In the tightening / loosening device having the above-described structure, when tightening the bolt head or the nut, the reaction force receiver is brought into contact with the end face of the structure such as the mold steel to be tightened, and the reaction force at the time of tightening is tightened. Is used so as to escape to the end face of this structure.

Then, the motor is driven to tighten or loosen the target bolt head or nut. That is, when the motor is driven, the output shaft rotates, this rotational power is transmitted to the clutch member, and the clutch member rotates, whereby the transmission member engaged and connected to the clutch member rotates, and the socket transmits the transmission member. The bolt head and nut engaged with the socket are tightened and loosened.

Particularly in the present invention, there is a play at the engaging portion between the engaging hole portion of the clutch member and the tip end portion of the output shaft for rotating the transmission member within a required angle range with respect to the output shaft. Since it is provided, if the socket is misaligned with the square shape of the bolt head or nut to be tightened and cannot be fitted, the transmission member is manually operated within the play range to load the load by the motor. It is possible to easily rotate without rotating the motor. Therefore, the socket can be rotated together with the transmission member without driving the motor, and the adjustment of the rotation allows the socket to be easily angled with respect to the bolt head and the like. Can be adjusted to

In the case where an operating portion piece that penetrates the casing and is exposed to the outside is provided in a part of the transmission member,
By manually rotating the operation piece, the transmission member and the socket attached thereto can be easily rotated.

With the above arrangement, the output shaft in the loose fitting state is in the engaged state at the moment when the motor is driven. However, the clutch member receives a shock from the output shaft every time the motor is driven. As a result, the clutch member may be damaged by repeated impacts from the output shaft. However, in the tightening / loosening device of the present invention, since the clutch member is detachably provided,
Even if this clutch member is damaged, the loss can be minimized by replacing only this clutch member.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The tightening / loosening device A shown in FIG. 1 and FIG. 2 is roughly divided into a motor unit M having a motor (not shown), a device body S continuing below the motor unit M, and a device body S.
It is composed of a reaction force receiving H which is attached to the bolt with a bolt 33.

Reference numeral 11 indicates an output shaft of the motor. Reference numeral 13 is a bearing for rotatably supporting the output shaft 11. The tip 11a of the output shaft 11 is formed in a square shape.

Reference numeral 19 is a shaft support member having an L-shaped vertical cross section, and a cylindrical bush 23 is provided on the inner surface of the lower part thereof. The shaft support member 19 and the casing 24 in the motor section M are fixed by bolts 25.

Reference numeral 60 designates a cylindrical clutch member (see FIG. 3).
(Refer to FIG. 3), and is arranged so as to be fitted inside the shaft support member 19. The rectangular end 1 which is the tip of the output shaft
1a is fitted in the engaging hole portion 16 formed in the clutch member 60, and the clutch member 60 is also rotated by the rotation of the output shaft 11 (see FIG. 4). In addition,
As described above, the clutch member 60 is arranged such that the outer peripheral surface of the clutch member 60 is in close contact with the inner peripheral surface of the bush 23 of the shaft support member 19. As a result, the output shaft 11
The clutch member 60 that has received the rotation of
It will rotate while sliding.

Reference numeral 12 is a casing of the apparatus main body S for accommodating a clutch member 60 and a transmission member for transmitting the rotational power of the output shaft 11 to a socket 20 described later.
The casing 12 and the shaft support member 19 are integrally fixed by a bolt 26 extending in the vertical direction.

The reaction force receiver H attached to the casing 12 with the bolts 33 has a protruding fixing portion 27 having a U-shaped cross section and extending downward from the attaching portion, and the protruding fixing portion 2
Abutment plate 2 attached to the lower end of 7 with bolts 28
It consists of 9. On the surface of the contact plate 29 facing the mounting surface of the protruding fixing portion 27, a smooth contact surface 31 for contacting with the end surface 51 of the structure 50 such as the type steel or steel frame to be fastened is formed. ing. This contact surface 31
By contacting the end face with the end face to tighten and loosen the bolt and nut, the reaction force generated during tightening and loosening can be released to the structure 50.

The transmission member in the casing 12 is composed of a drive gear 14 arranged coaxially with the output shaft 11, and a driven gear 15 arranged in parallel with the drive gear 14. A socket 20 that fits and engages with the lower end of the driven gear 15 with the head B of a hexagon bolt to be tightened or a hexagon nut.
Is installed.

The drive gear 14 has a rectangular connecting shaft 35 extending upward.
Is fitted into the lower engagement hole portion 36 of the clutch member 60. As a result, the rotational drive of the clutch member 60 rotated by the drive of the motor is performed by the drive gear 14
Can be told. If the drive gear 14 rotates,
The driven gear 15 also rotates at the same time, and as a result, the socket 20 attached thereto also rotates.

As shown in FIG. 5, the socket 20 described above is used.
Is a substantially V-shaped engagement groove 22 formed by a ridge portion 21 projecting mainly toward the axis of the triangular chevron on the inner circumference slightly larger than the circumscribed circle of the bolt head B to be tightened. It is formed at required angular intervals in the circumferential direction according to the square shape of the head B. For example, when used for tightening and tightening hexagon bolts and nuts, the projections 21 and the engaging grooves 22 are each twice the number of angles, that is, 12 at 30 ° intervals, corresponding to the corners at every 60 °. They are provided alternately.

In the clutch member 60 of the fastening device A,
A play 17 having a required angle is provided at an engaging portion between the engaging hole portion 16 and the rectangular end portion 11a. As a concrete means thereof, the engaging hole portion 16 has a rectangular cross section corresponding to the rectangular end portion 11a. Instead of being formed, as shown in FIG. 4, an engagement contact surface 16 that abuts and engages with the side surface of the rectangular end portion 11a during rotation.
a and an engagement contact surface 16 with which the side surface abuts and engages during reverse rotation
The angle θ corresponding to the disposition angle of the V-shaped engagement groove 22 of the socket 20 between itself and b, that is, 30 ° when the engagement grooves 22 are provided at intervals of 30 ° as described above. The expanded space portion is formed as a play 17 by being expanded so as to rotate in the angle range. Therefore, when the motor is stopped, the drive gear 14 and the socket 20 are
The driven gear 15 with the rotary shaft 11 is rotated within the above angle range.
With respect to the socket 20, the socket 20 can be adjusted in angular direction.

The angle .theta. Of the play 17 is adjusted to the arrangement angle of the V-shaped engaging groove 22 with which the corner portion of the bolt head B is engaged as described above, depending on the inner peripheral shape of the socket 20. desirable. That is, by doing this, the socket 20
Can be aligned with respect to the bolt head B in either direction of forward rotation and reverse rotation.

In the above-described rotation adjustment, the socket 20 can be directly rotated by holding it, but in the illustrated embodiment, the driven gear 15 with the socket 20 is penetrated through the casing 12 at the upper end portion of the driven gear 15 and externally rotated. A knob serving as the operation section piece 18 is fixedly mounted so that the above-mentioned rotation adjustment can be performed while holding the operation section piece 18. The operation portion piece is not limited to the embodiment shown in the drawings, but can be variously implemented with a structure that allows the rotation of the driven gear 15.

Incidentally, the contact plate 29 in the reaction force receiving H
Is detachably attached by a bolt 33, the contact plate 29 may be replaced with one having a different thickness so that the distance between the shaft center of the socket 20 and the contact surface 31 is changed from the bolt shaft center to the structure. It can be adjusted according to the distance to the end face 50.

When performing the tightening / loosening work of the bolts, nuts and the like using the above-mentioned tightening / loosening device A, the socket 20 is fitted into and engaged with the bolt head B, but the angular shape of the bolt head B is temporarily assumed. If the direction of does not match the direction of the shape of the inner periphery of the socket 20, the socket 20 cannot be fitted into the bolt head B, and the tightening / loosening operation cannot be performed.

At this time, even if the tightening / loosening device A itself is rotated to change the direction of the socket 20, the reaction force receiver H is fixed to the casing 12 portion equipped with the socket 20 and the reaction force receiver H is received. Since the positional relationship between the socket 20 and the socket 20 (direction, spacing, etc.) is restricted, it is not possible to rotate the fastening device A itself for alignment, but the fastening device of the present invention configured as described above. In the case of A, the driven gear 15 which is one of the transmission members to which the socket 20 is attached
When the operating portion piece 18 provided on the is pinched and rotated to the left or right, the driven gear 15 rotates together with the drive gear 14, and the socket 20 attached thereto rotates and the bolt head B and Can be matched.

That is, the engaging hole portion 16 of the drive gear 14
Inside, there is a play 17 of a required angle in the rotational direction at the engaging portion with the square end 11a of the output shaft 11 of the motor that fits and engages with this, so that the play is achieved when the motor is stopped. Within the range of 17, the transmission member, that is, the drive gear 14 and the driven gear 15 with a socket that meshes with this, can freely rotate without receiving the load of the motor. Therefore, the operating portion 18 provided on the driven gear 15 can be The driven gear 15 with the socket 20 can be easily rotated by turning it by hand.

Therefore, the direction of the socket 20 to be engaged with the bolt head B can be easily adjusted manually without intermittently driving the motor.

With the above construction, the output shaft 11 which is loosely fitted in the clutch member 60 is engaged at the moment when the motor is driven. In other words, at the moment when the motor is driven, the output shaft 11 has the side surface of the rectangular end 11a of the output shaft 11 and the engaging contact surface 16b.
From the state in which and are in abutting engagement, the side surface comes into a state in which they are in abutting engagement with the engaging contact surface 16a. At this time, the engagement contact surface 16a receives a large impact from the output shaft 11.

As described above, the clutch member 60 receives a large impact from the output shaft 11 every time the motor is driven, and the clutch member 60 particularly the engaging contact surface 16a or the shaft center of the clutch member 60. It is not impossible that the corner portion 16c projecting toward the end may be damaged by repeated impacts from the output shaft 11. However, in the fastening device of the present invention, since the clutch member 60 is detachably provided (the bolt 25 for fixing the shaft support member 19 and the casing 24 is removed, the motor portion M and the device main body S are separated from each other). Then, the bolt 26 for fixing the device main body S and the shaft supporting member 19 is removed and the shaft supporting member 19 is removed from the device main body S.
0 can be extracted. ), Even if the clutch member 60 is damaged, the loss can be minimized by replacing only the clutch member 60.

In this embodiment, the transmission member from the motor to the socket 20 is a combination of the driving gear 14 and the driven gear 15, but the both gears are omitted, and the socket is equipped with It is also possible to provide a single transmission member, or to take a form in which the reaction force receiver is once projected in the radial direction and further hung downward. Further, a reaction force receiver may be provided at the lower end portion of the apparatus main body S. Of course, when the bolt head or nut has a planar shape of a quadrangle or other polygonal shape and a socket corresponding thereto is provided, the play described above can be provided and the same operation can be performed.

[0039]

As described above, according to the present invention, the angular position of the socket with respect to the head of the bolt and the like can be adjusted by a simple manual operation without driving the motor. Since it is not necessary to drive the motor intermittently, there is no fear of impairing the durability of the motor and the socket.

Further, since the clutch member is detachably provided, even if this clutch member is damaged, only this clutch member can be easily replaced and the loss can be minimized. ..

[Brief description of drawings]

FIG. 1 is a tightening / loosening device (partially omitted) showing an embodiment of the present invention.
FIG.

FIG. 2 is a partially exploded sectional view of the fastening device in the previous figure.

3A and 3B show a clutch member, where FIG. 3A is a plan view, FIG. 3B is a partially cutaway side view, and FIG. 3C is a bottom view.

FIG. 4 is a cross-sectional view showing an engagement state between an output shaft end portion and an engagement hole portion in a clutch member.

FIG. 5 is a bottom view (partially omitted) of the tightening / loosening device showing the shape of the inner peripheral surface of the socket.

FIG. 6 is a side view showing a usage state of a conventional fastening / loosening device.

[Explanation of symbols]

 A: Tightening device B: Bolt head H: Reaction force reception S: Device body 11 ... Output shaft 11a ... Square end 12 ... Casing 14 ... Drive gear 15 ... Driven gear 16 ... ... Engagement hole 17 ... Play 18 ... Operation piece 20 ... Socket 60 ... Clutch member

Claims (2)

[Claims] 1. A fastening device comprising a reaction force receiver attached to a device body, wherein a tip end portion of an output shaft of a motor as a drive source is fitted into a clutch member having an engagement hole portion to transmit rotation. A transmission member fitted with a socket that engages with the bolt head or the nut and is engaged with the clutch member so that rotation can be transmitted. A play for rotating the transmission member within a predetermined angle range is provided in an engaging portion with the tip portion of the shaft, and the clutch member is detachably provided from the tip portion of the output shaft and the transmission member. A bolt and nut tightening / loosening device. 2. The tightening of a bolt and a nut according to claim 1, wherein a part of the transmission member is provided with an operation portion piece which penetrates the casing and can rotate the transmission member within the play range. Loosening device.