JP3028143B2 - Bolt and nut tightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening and loosening device used for fastening or loosening bolts and nuts.

[0002]

2. Description of the Related Art As is well known, a strong reaction force is applied to an electric tightening and tightening device such as a nut runner used for tightening and loosening bolts and nuts during use (when tightening). Acts on the grip.

Therefore, as shown in FIG. 10, a reaction force receiving member 102 is provided at a lower portion of a casing 100 of the tightening and loosening device A '.
The reaction force receiver 102 is fastened to the nut or bolt 10 already fastened.
The tightening and loosening work is performed while abutting a part of the part 4. Thereby, the reaction force generated at the time of loosening can be absorbed by the nut or bolt 104 already fastened, and the reaction force can be prevented from being transmitted to the operation grip portion 106.

[0004]

However, in the above-mentioned tightening and loosening device A ', the reaction force receiver 102 is not
In most cases, as shown in FIG. 1, only a part of the bolt 104 already fastened can be brought into contact. However,
Since a strong reaction force generated at the time of tightening is applied to only a part of the bolt 104, there is a problem that a corner of the bolt 104 which receives the reaction force cracks or breaks. .

[0005]

To solve the above-mentioned problems, the following measures have been taken. That is, the bolt and nut tightening and loosening device of the present invention (hereinafter, referred to as “tightening and loosening device”)
) Is a tightening device in which a reaction force receiver is attached to a casing of a transmission portion for driving a socket engaged with a bolt head or a nut (hereinafter, referred to as a "bolt"). A force receiving portion, a protruding fixed portion protruding from the casing, a movable portion abutted on the protruding fixed portion,
A sliding means for allowing the movable portion to slide along a contact surface with the protruding fixed portion, and attached to the movable portion, which is rotatable around the attachment portion and has already been fastened. A reaction force receiving portion capable of planarly supporting a side portion of a bolt or the like (hereinafter, referred to as an “installed hexagon bolt”).

[0006]

In the fastening device of the present invention, first, the socket is engaged with a bolt or the like to be fastened. In this state, if the reaction force receiving portion cannot support the installed hex bolt to give the reaction force from the side, that is, if the reaction force receiving portion is far from the installed hex bolt and cannot hold the installed hex bolt The sliding means slides the movable part which is in contact with the protruding fixed part, and brings the reaction force receiving part attached to the movable part close to the vicinity of the target hex bolt or the like. Then, the reaction force receiving portion is appropriately rotated about the mounting portion, and the side portion of the already installed hexagonal bolt is planarly supported by the reaction force receiving portion.

[0007] If the tightening and loosening device is used while maintaining such a state, a strong reaction force generated at the time of tightening and loosening can be applied to the already-installed hexagonal bolt in a planar manner. There is no worry that the corners of the bolts will crack or break.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 10 denotes a device main body of a tightening / closing device A equipped with a driving motor (not shown). Reference numeral 12 denotes a casing of a transmission unit connected to a lower portion of the apparatus main body 10. Inside the casing 12, a drive gear that constitutes a transmission portion, a driven gear that meshes with the drive gear, and the like (not shown) are housed.

Reference numeral 14 denotes a socket which engages with a hexagon bolt to be tightened and loosened (hereinafter referred to as a "target hexagon bolt"). The socket 14 is connected to the transmission unit and is rotatable.

Reference numeral 16 denotes a plate-shaped projecting fixing portion, which projects below the casing 12 in a direction perpendicular to the axis of the apparatus body 10. FIGS. 3 and 4 show a perspective view of the vicinity of the protruding fixing portion 16, in other words, a reaction force receiving portion H of the fastening device A, and an enlarged end view taken along the line AA. The protruding fixing portion 16 has a long groove 18 extending in the left-right direction (in FIG. 4, the direction perpendicular to the paper surface) and penetrating vertically, and
(The left side). In addition, the long groove 18 has an adjustment groove 22 extending over the entire circumference on the inner peripheral surface.

Reference numeral 24 denotes a moving vehicle. This moving vehicle 24
Is installed inside the long groove 18 in such a manner that its outer edge enters the adjusting groove 22, that is, the moving vehicle 24 does not easily come out. Thereby, the movable wheel 24 becomes movable in the direction in which the long groove 18 extends.

Reference numeral 28 denotes a bridge plate arranged in a direction orthogonal to the long groove 18, and its end is fixed by the movable wheel 24 and screws 27. Thereby, the moving vehicle 2
If 4 moves along the long groove 18, the erection plate 28 also moves, and moves while maintaining the orthogonal state with the long groove 18. In the present embodiment, the sliding means S is constituted by the long groove 18, the moving vehicle 24 provided therein, a mounting plate 28, and a screw 27 for fixing the moving vehicle 24 and the mounting plate 28. I have.

The slide means S is not limited to the above, but may be a means utilizing a rack and a pinion. Instead of the moving wheel 24, a spherical rolling member that can move in the long groove 18 while rotating along the adjusting groove 22 can be used. Further, the projecting fixing portion 16 and the erection plate 2
The fixing method with the fixing member 8 is not limited to the above-described method. As shown in FIG. It can also be carried out by a method of being sandwiched between the bridge 50 and the erection plate 28.

Reference numeral 26 denotes a movable plate having a rectangular parallelepiped shape.
The smooth surface 20 of the protrusion fixing portion 16 and the rear surface 30 of the movable plate corresponding to the smooth surface 20 are in close contact with each other.

Reference numeral 34 denotes a plate-like reaction force receiving portion, which has a shape as viewed from a plane in which a sector having an inner angle of 120 ° is cut out from a circle. That is, the reaction force receiving portion 34 is provided with the cut-out portion 35 so as to support the already attached hexagonal bolt B already tightened from the side surface.

The reaction force receiving portion 34 is mounted on an end of the erection plate 28 opposite to the portion fixed to the movable vehicle 24, and is rotatably mounted by screws 31. At this time, the movable plate 26 is fixed together with screws 31. Thus, when the erection plate 28 is moved in the left-right direction, the movable plate 26 slides along the smooth surface 20 of the protruding fixing portion 16, and the reaction force receiving portion 34 moves in the left-right direction accordingly. .

Next, the use state of the tightening / closing device A having the above configuration will be described. As shown in FIG.
′ Is engaged with a socket 14 provided inside the casing 12. At this time, as shown in FIG.
In the case where 4 does not reach the already installed hexagon bolt B, that is, when the side surface of the already installed hexagon bolt B cannot be held by the reaction force receiving portion 34, the erection plate 28 is moved to the left as shown in FIG. . As a result, the movable plate 26 slides on the smooth surface 20 of the protruding fixing portion 16, and accordingly, the reaction force receiving portion 34 moves to the left. It becomes possible. Further, since the reaction force receiving portion 34 is rotatable around the screw 31, the direction of the reaction force receiving portion 34 can be changed according to the direction of the installed hexagon bolt B as shown in FIG. 8. it can.

As described above, the notch 3 of the reaction force receiving portion 34
5, a part of the installed hexagonal bolt B is arranged, and the installed hexagonal bolt B is held by the reaction force receiving portion 34. If the tightening device A is used in this state, a strong reaction force generated at the time of tightening and loosening can be obtained. It can be applied to the already installed hexagonal bolt B in a planar manner. Therefore, there is no fear that the corners of the already installed hexagonal bolt B are cracked or damaged unlike the related art.

The shape of the reaction force receiving portion 34 as viewed from the plane is not limited to a circular shape having a sector shape having an inner angle of 120 ° from a circular shape as in this embodiment, but also a square, hexagonal shape, or the like.
A shape obtained by cutting out the sector (triangle) from other polygons or irregular shapes may be used.

The movable plate 26 may have a triangular shape, a circular shape, a trapezoidal shape, or the like as long as it can slide on the smooth surface 20 of the protruding fixing portion 16.

In the present embodiment, the movable plate 26 and the protruding fixed portion 1
6 and the erection plate 28 is placed thereon, and the reaction force receiving portion 34 is placed thereon.
To form a reaction force receiver H. However, with respect to the arrangement relationship, several patterns can be considered in addition to the present embodiment. FIG. 9 shows a vertical end view of the reaction force receiver H showing an example thereof.
In FIGS. 9 (d) and 9 (e), the mounting of the bridge plate 28 and the reaction force receiving portion 34 to the movable plate 26 is performed by separate screws (a screw 31 and a screw 52). This is not always necessary, but is preferable because the strength of the reaction force receiver H can be improved and the thickness can be reduced.

All other embodiments belonging to the claims are within the scope of the present invention.

[0023]

By using the tightening device of the present invention, a strong reaction force generated at the time of tightening can be applied to the installed hexagonal bolt in a planar manner. Therefore, unlike the related art, there is no fear that the corners of the already-installed hexagon bolts are cracked or damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fastening device according to an embodiment of the present invention.

FIG. 2 is a partial front view of the fastening device of FIG.
It is a bottom view of the fastening device corresponding to this figure.

FIG. 3 is a perspective view of a reaction force receiver.

FIG. 4 is an end view taken along the line AA in FIG. 3;

FIG. 5 is an end view showing another embodiment.

FIG. 6 is a plan view showing a state where a bolt head is engaged with a socket.

7 is a plan view showing a state in which the erection plate has been moved to the left from the state of FIG. 6 and the already installed hexagon bolts are supported by the reaction force receiving portion.

FIG. 8 is a plan view of the reaction force receiver showing a state in which the reaction force receiver is rotated in accordance with the direction of an already installed hexagon bolt.

FIG. 9 is a longitudinal end view showing another embodiment in which the arrangement of the projecting fixing portion, the erection plate, the movable plate, and the reaction force receiving portion is changed.

FIG. 10 is a perspective view showing a conventional fastening device.

FIG. 11 is a plan view showing a contact state between a reaction force receiver and an already installed hexagonal bolt, which is conventionally employed.

[Explanation of symbols]

 A: tightening / releasing device B: already installed hexagon bolt B ': target hexagon bolt H: reaction force receiving S: sliding means 12 ... casing 14 ... socket 16 ... protruding fixing part 18 ... long groove 20 ... smooth surface 22 ... moving wheel 26 ... Movable part 34: Reaction force receiving part 35: Notch

Claims (1)

(57) [Claims] 1. A tightening / closing device in which a reaction force receiving member is attached to a casing of a power transmitting portion for driving a socket engaged with a bolt head or a nut, wherein the reaction force receiving member protrudes from the casing. A fixed part, a movable part in contact with the fixed part, a sliding means for enabling the movable part to slide along a contact surface with the fixed part, and a movable part. A bolt or nut which is rotatable about the mounting portion and comprises a reaction force receiving portion capable of supporting the bolt head or the side of the nut already fastened in a plane. Tightening device.