JP3028146B2 - 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 an apparatus for tightening bolts and nuts, which is used when fastening steel structures and steel shapes of various structures with bolts and nuts.
The present invention relates to a bolt and nut tightening and loosening device in which a casing of a transmission unit for driving a socket engaged with a bolt head or a nut is provided with a reaction force receiver.

[0002]

2. Description of the Related Art Conventionally, in an electric tightening and loosening device such as a nut runner used for tightening and loosening bolts and nuts, a strong reaction force is exerted when tightening and loosening. Acting on the gripper. For this reason, a reaction force receiver is provided on the apparatus main body, and the reaction force receiver is brought into contact with a part of a structure such as a mold steel to tighten and loosen the reaction force. The reaction force is prevented from being transmitted to the operation grip.

[0003] As a form of such a fastening device, FIG.
As shown in FIG. 6, a casing 111 of a transmission unit for driving a socket 114 for engaging a bolt head B or a nut at the lower end of the apparatus main body 110.
A reaction force receiver 124 extending parallel to the axis of the socket 114;
Some are attached.

[0004] The reaction force receiver 124 is connected to the casing 11.
1 and a fixing portion 120 fixed to the
20 and a contact plate 123 attached by a screwing means.

When the bolt is fastened, the bolt head B is engaged with the socket 114, and the contact surface 121 of the contact plate 123 is brought into contact with the end surface 151 of the structure 150. Thus, as described above, the reaction force can be released to the structure 150, and the reaction force is not transmitted to the operation grip portion.

However, the position of the bolt head B or the like to be tightened or the like usually changes according to the form of the structure 150 such as a mold steel or the working conditions, and the structure 150 to which the contact plate 123 is brought into contact. The distance L from the end surface 151 to the axis of the bolt head B is not always constant. The distance L and the distance S from the contact surface 121 of the contact plate 123 to the socket axis.
If there is a difference between them, the tightening work cannot be performed smoothly.

For example, the distance L from the bolt head B to the end surface 151 of the structure 150 depends on the contact surface 12 of the reaction force receiver 124.
When the distance S is larger than the distance S from 1 to the socket axis, the reaction force receiver 124 cannot be brought into contact with the structure 150 as a matter of course.

If the distance L is smaller than the distance S, the reaction force receiver 124 can be brought into contact with the structure 150. The reaction device causes the fastening device itself to rotate.

Therefore, in this type of tightening and tightening device, it is necessary to adjust the distance S so as to be substantially equal to the distance L.

Conventionally, for this adjustment, a plurality of abutting plates 123 having different thicknesses are prepared in advance, and have an optimum thickness (so that the interval S is almost equal to the distance L) at the site. The contact plate 123 is selected and attached to the protruding fixing portion 120.

However, the prepared contact plate 12
3 is often lost, and in the field,
It is extremely troublesome to prepare a plurality of abutting plates 123 or to select one of a plurality of abutting plates 123 that can be optimal for each of the different intervals S and distances L, and to replace and install them. This was the cause of lowering work efficiency.

[0012]

To solve the above-mentioned problems, the following measures have been taken. The tightening and loosening device for bolts and nuts of the present invention (hereinafter simply referred to as “tightening and loosening device”) is provided at the lower end of the device body on a casing of a transmission portion for driving a socket that engages with a bolt head or a nut. A bolt and nut tightening and loosening device provided with a reaction force receiver, wherein the reaction force receiver is attached to the projecting fixed portion fixed to the casing by screwing means, A contact adjusting plate having a contact surface parallel to the axial direction of the socket, such that the contact adjusting plate has a contact surface parallel to the axial direction of the socket, so that the contact adjusting plate side of the protrusion fixing portion is formed. The contact adjustment plate is formed in a stepwise shape in a width direction orthogonal to the axial direction of the socket, and the protrusion fixing portion side of the contact adjustment plate is displaceable in the width direction in correspondence with the shape of the protrusion fixing portion. It is formed in a step shape like A plurality of screw holes for attaching to the protruding fixing portion of the contact adjustment plate are provided in parallel in the width direction, and the contact adjustment plate is displaced in the width direction with respect to the protruding fixing portion for mounting, so that the socket shaft center is provided. And the distance between the contact surface and the reaction force receiving member can be adjusted.

[0013]

In the tightening device of the present invention, the distance between the surface to which the reaction force is to be abutted, for example, the end surface of a structure such as a steel shape, and the bolt axis when the bolt head or nut is tightened. When the distance L is different from the distance S between the contact surface and the socket axis in the reaction force receiving, the screwing position of the contact adjusting plate with respect to the projecting fixing portion is shifted in the width direction, that is, the mounting position is changed. Then, the distance S is adjusted to be substantially the same as the distance L.

That is, since the contact adjustment plate attached to the protruding fixing portion of the reaction force receiving member is formed in a step shape, the thickness thereof changes in the width direction with respect to the contact surface with the end surface of the structure. If, for example, the small side of the contact adjustment plate is screwed and fixed to the protruding fixing portion, the distance S from the contact surface to the socket axis becomes large, and If the thicker side is screwed and fixed to the protruding fixing portion, the distance S from the contact surface to the socket axis becomes smaller.

Therefore, the distance S from the contact surface to the axis of the socket can be adjusted by changing the position of the contact adjustment plate with respect to the protruding fixing portion in the lateral width direction. Can be easily adjusted to an appropriate distance to the distance L from the end face of the bolt to the bolt axis.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, reference numeral 10 denotes a main body of a tightening / closing device A equipped with a driving motor (not shown). Code 11
Is a casing of a transmission portion connected to a lower portion of the main body 10, and has a drive gear 1 as a transmission member therein.
2 and a driven gear 13 meshing with the drive gear 12 are housed and held, and a lower end of the driven gear 13 is fitted to a hexagon bolt head or a hexagon nut (hereinafter referred to as a “bolt head or the like”) to be tightened or loosened. A socket 14 to be engaged and engaged is mounted, and a square end 15a of an output shaft 15 of the motor is fitted into an engagement hole 12a of the drive gear 12 and is engaged and connected so as to be capable of transmitting rotation. Is reduced and transmitted to the socket 14.

Reference numeral 20 denotes a reaction force receiving projecting from the lower portion of the casing 11, which has a contact surface 21 parallel to the axis of the socket 14, and fastens this contact surface 21 to a steel or steel frame. By contacting the end surface 51 of the target structure 50,
The reaction force generated when bolts and nuts are tightened is
You can escape to zero.

As shown in FIGS. 1 to 3, the reaction force receiver 20 includes a projecting fixing portion 22 fixedly mounted on the casing 11.
And a contact adjustment plate 23 attached to the protruding fixing portion 22 by screwing means. Contact surface 2 described above
Numeral 1 is formed on the inner surface of the contact adjustment plate 23.

As is apparent from the drawing, the shape of the protrusion fixing portion 22 is such that the protrusion protrudes from the socket 14 in steps of a dimension h at every pitch m. That is, from the left side in FIG. 1, the first protruding portion 22a and the second protruding portion 2
2b, a third protruding portion 22c, and a fourth protruding portion 22d are formed.
A step surface 42 a is formed in a stepwise manner in a width direction orthogonal to the axial direction of the socket 14.

On the other hand, the shape of the abutment adjusting plate 23 is such that it can match the step shape of the protruding fixing portion 22, that is, the thickness in the direction of the socket 14 is stepwise displaced at the pitch m and the dimension h. It has a shape. In the present embodiment, the length of the contact adjustment plate 23 in the width direction is the same as that of the protruding fixing portion 22, but it is not always necessary to do so.

The contact adjusting plate 23 is, as described above,
Although it is attached to the protruding fixing portion 22, an example of the attachment structure will be briefly described below. That is, the protrusion fixing portion 22 includes the second protrusion 22b and the third protrusion 22c.
, One screw insertion hole 24 for each
Are arranged side by side in the width direction, and four screw holes 25 for screwing are arranged in the other contact adjustment plate 23 at the same pitch as the insertion holes 24 in the width direction for each formed step. ing.

A screw member 26 such as a small bolt is inserted into each insertion hole 24.
Is inserted and screwed, and at the same time, the distal end of the screw member 26 is screwed to the contact adjustment plate 23 so that the contact adjustment plate 23 can be fixedly screwed to the protruding fixing portion 22. And
At a position where the insertion hole 24 coincides with the screw hole 25, the contact adjustment plate 23 is displaced in the lateral width direction and can be screwed and fixed.

That is, when two screw holes 24 and four screw holes 25 are used as in the present embodiment, the combination that matches the two places is the combination shown in FIG. 1 and FIG. There are three types, including the form illustrated in FIG. 1, and the mounting position of the contact adjustment plate 23 is shifted in the width direction, and by appropriately selecting the form, the contact surface 21 of the reaction force receiver 20 is selected.
, That is, the contact surface 2 from the axis of the socket 14
The interval S up to 1 can be changed and adjusted in several steps.

Therefore, when using the fastening device A, as described above, according to the distance L from the bolt head B to be fastened to the end face 51 of the structure where the reaction force receiver 20 contacts. The mounting position of the contact adjustment plate 23 may be adjusted and fixed so that the distance S between the contact surface 21 of the reaction force receiver 20 and the axis of the socket 14 is set.

For example, when the distance S from the contact surface 21 to the socket axis is increased, the contact adjustment plate 23 is attached such that the thinner side of the contact adjustment plate 23 is brought into contact with the protruding fixing portion 22. To reduce the distance, the contact adjustment plate 23
What is necessary is just to screw and fix the side having the larger thickness to the protruding fixing portion 22. Thereby, the distance S can be adjusted to adapt to the distances L and L ′, and the contact surface 21 can be adjusted.
Can always be held in the same direction with respect to the socket 14, so that the reaction force receiver 20 can be brought into contact with the structural end face 51 to perform the tightening and loosening operation.

In this embodiment, the first to fourth step-like projections are provided. However, the present invention is not limited to this. Alternatively, a larger number of protrusions may be provided so that the above-described interval S can be finely adjusted. Also, the first protrusion 2
If the insertion holes 24 are provided in all of the second protrusions 22a,..., The number of combinations of the protrusion fixing portion 22 and the contact adjustment plate 23 is more conceivable, which is preferable.

[0027]

As described above, according to the tightening and tightening device of the present invention, by changing the mounting position of the contact adjustment plate with respect to the protruding fixing portion in the width direction, the contact between the shaft center of the socket and the reaction force receiving portion is changed. Adjustment of the gap between the contact surface is facilitated.
As a result, there is no need to prepare a plurality of contact adjusting plates having different thicknesses as in the related art, and there is no need to select and replace an appropriate one from a plurality of contact plates. Workability has been improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the vicinity of a reaction force receiving portion showing a use state of a fastening device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a contact adjustment plate is separated and viewed from below.

FIG. 3 is a longitudinal sectional view of the fastening device showing an internal structure.

FIG. 4 is a cross-sectional view showing a state in which an attachment position of a contact adjustment plate with respect to a protrusion fixing portion is changed and an interval S is adjusted.

FIG. 5 is a side view showing the entirety of a conventional fastening device.

FIG. 6 is a cross-sectional view of the vicinity of a reaction force receiving portion showing a use state of the tightening and tightening device of the preceding figure.

[Explanation of symbols]

 A: Tightening / releasing device 10: Device main body 11: Casing 14: Socket 20: Reaction force receiving 21: Contact surface 22: Projection fixing portion 23: Contact adjustment plate 24: Insertion hole 25: Screw hole

Claims (1)

(57) [Claims] An apparatus for tightening bolts and nuts, wherein a reaction force receiving member is attached to a casing of a transmission portion for driving a socket engaged with a bolt head or a nut at a lower end portion of the device body, A reaction force receiving portion, a projecting fixed portion fixed to the casing, and attached to the projecting fixed portion by a screwing means so that the projecting portion can abut against a wall surface of a structure or the like to which a reaction force is to be applied; A contact adjusting plate having a contact surface parallel to an axial direction of the socket, wherein the contact adjusting plate side of the protrusion fixing portion is formed in a stepwise shape in a width direction orthogonal to the axial direction of the socket; The protrusion fixing portion side of the contact adjustment plate is formed in a step shape so as to correspond to the shape of the protrusion fixing portion so that the contact adjustment plate can be displaced in the lateral width direction. Screw holes for mounting to A plurality of juxtaposed in the width direction, the abutment adjusting plate is displaced in the lateral width direction with respect to the protruding fixing portion and attached, so that the distance between the socket axis and the abutting surface in the reaction force receiving portion can be adjusted. A bolt and nut tightening / closing device, characterized in that: