JPH0538680A - Bolt/nut fastening and loosening device - Google Patents

Abstract

PURPOSE:To adjust easily the spacing between the axis of a socket and the contacting surface of a reaction force receiver and enhance the easiness in works at site by displacing a contact adjusting plate across the width when the plate is to be installed in a protrusive fixation part. CONSTITUTION:A reaction force receiver 20 is composed of a protrusive fixation part 22, which is provided at a casing 11, and a contact adjusting plate 23 which has a contacting surface 21 parallel with the axis of a socket 14 and is installed in the fixation part 22 by a screw 26 fastening means to enable contacting with the wall surface of a structure to which a reaction force is given. That part of the fixation part 22 situated on the adjusting plate side is formed in steps, while that part of the adjusting plate 23 on the fixation part 22 side is shaped in steps so as to enable mating with the fixation part 22, and a plurality of threaded holes 25 for installing in the fixation part 22 are provided in the adjusting plate 23 along the width which is perpendicular to the axis of the socket 14.

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 / nut tightening / loosening device in which a reaction force receiver is attached to a casing of a transmission unit that drives a socket that engages with 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 operated during tightening. It acts on the gripping part. Therefore, a reaction force receiver is provided on the main body of the apparatus, and the reaction force can be released to the structure by abutting the reaction force receiver on a part of a structure such as a shape steel and tightening the structure. The reaction force is not transmitted to the operating grip.

As a form of such a tightening / loosening device, FIG.
As shown in FIG. 6 and FIG. 6, the casing 111 of the transmission unit for driving the socket 114 that engages the bolt head B or the nut or the like at the lower end of the apparatus body 110.
The reaction force receiving member 124 extending parallel to the axis of the socket 114.
There is one 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 fastened, 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 brought into contact 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.

However, the position of the bolt head B or the like to be tightened or loosened always changes according to the form of the structure 150 such as a shape steel or the working condition, and the structure 150 with which the contact plate 123 abuts. The distance L from the end surface 151 to the axis of the bolt head B is not always constant. This distance L and the distance S from the contact surface 121 of the contact plate 123 to the socket shaft center
If there is a difference between and, it means that the tightening and loosening work cannot be performed properly.

For example, the distance L from the bolt head B to the end surface 151 of the structure 150 is the contact surface 12 of the reaction force receiver 124.
When the distance S from 1 to the socket shaft center is larger than the space S, 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 interval S, the reaction force receiving member 124 can be brought into contact with the structure 150, but the space portion due to the difference between the distance L and the interval S is accompanied by tightening. The reaction force causes the fastening / loosening device itself to rotate.

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

For this adjustment, conventionally, a plurality of contact plates 123 having different thicknesses are prepared in advance, and the contact plates 123 have an optimum thickness (the distance S is almost equal to the distance L) on site. The contact plate 123 was selected and attached to the protruding fixing portion 120.

However, the contact plate 12 prepared in advance
Often a part of 3 is lost, and in the field,
It is extremely troublesome to prepare a plurality of contact plates 123, or to select one of the contact plates 123 that can be optimal each time the distance S and the distance L are different from each other, and attach and replace the contact plate 123. It was a cause of lowering work efficiency.

[0012]

[Means for Solving the Problems] Therefore, in order to solve the above problems, the following means were taken. The tightening / loosening device for bolts, nuts, etc. of the present invention (hereinafter, simply referred to as “fastening / loosening device”) is used in a casing of a transmission unit for driving a socket that engages with a bolt head or a nut at the lower end of the device body. A bolt and nut tightening / loosening device provided with a reaction force receiver, wherein the reaction force receiver is fixed to the casing by a projecting fixing portion, and is attached to the projecting fixing portion by screwing means. A contact adjusting plate having a contact surface parallel to the axial direction of the socket that enables contact with a wall surface of a structure or the like to which force is to be applied. A stepped shape is formed in the lateral width direction orthogonal to the axial direction of the socket, and the protrusion fixing portion side of the contact adjusting plate can displace the contact adjusting plate in the lateral width direction in correspondence with the shape of the protruding fixing portion. While being formed in a staircase shape A plurality of screw holes for attaching to the protrusion fixing portion of the contact adjusting plate are arranged side by side in the lateral width direction, and the contact adjusting plate is displaced in the lateral width direction with respect to the protrusion fixing portion and attached, whereby the socket shaft center is attached. The distance between the contact surface and the contact surface of the reaction force receiver can be adjusted.

[0013]

In the tightening / loosening device of the present invention, when tightening the bolt head or nut, the distance between the surface to which the reaction force contact should come into contact, for example, the end surface of the structure such as steel mold, and the bolt shaft center. When L is different from the distance S between the contact surface and the socket shaft center in the reaction force receiving, the screw fixing point of the contact adjusting plate with respect to the protruding fixing portion is displaced in the lateral width direction, that is, the mounting position is changed. Then, the distance S is adjusted to be substantially equal to the distance L.

That is, since the contact adjusting 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 lateral width direction with respect to the contact surface of the structure with the end surface. If, for example, the side of the contact adjusting plate having a small thickness is brought into contact with the protruding fixing portion and fixed by screws, the distance S from the contact surface to the socket axis becomes large, and When the thicker side is brought into contact with the protruding fixing portion and fixed by screws, the distance S from the contact surface to the socket axis is reduced.

Therefore, by adjusting the mounting position of the contact adjusting plate with respect to the protruding fixing portion in the lateral width direction, the distance S from the contact surface to the socket shaft center can be adjusted. The distance L from the end face to the shaft center of the bolt can be easily adjusted to an appropriate distance.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, reference numeral 10 is a main body of the fastening / loosening device A equipped with a drive motor (not shown). Code 11
Is a casing of a transmission portion connected to a lower portion of the main body 10, and the drive gear 1 serving as a transmission member is provided therein.
2 and a driven gear 13 meshing with the drive gear 12 are housed and held, and the lower end of the driven gear 13 is fitted with a head of a hexagon bolt or a hexagon nut (hereinafter referred to as "bolt head") to be tightened. A socket 14 for mating engagement is attached, and a rectangular end portion 15a of an output shaft 15 of a motor is fitted into an engaging hole portion 12a of a drive gear 12 and engaged and coupled so as to enable rotation transmission. The rotation of is reduced and transmitted to the socket 14.

Reference numeral 20 is a reaction force receiving member provided in a protruding manner at the lower portion of the casing 11, and has a contact surface 21 parallel to the axial center of the socket 14, and this contact surface 21 is fastened to a steel mold or steel frame. By contacting the end surface 51 of the target structure 50,
The reaction force generated when tightening bolts and nuts
Can escape to zero.

As shown in FIGS. 1 to 3, the reaction force receiver 20 has a protruding fixing portion 22 fixed to the casing 11.
And a contact adjusting plate 23 attached to the protruding fixing portion 22 by screwing means. The contact surface 2 described above
1 is formed on the inner surface of the contact adjusting plate 23.

As is apparent from the drawing, the shape of the protruding fixing portion 22 is such that the protruding fixing portion 22 is projected with respect to the socket 14 stepwise by the pitch m and the dimension h. That is, the first protrusion 22a and the second protrusion 2 are arranged from the left side in FIG.
2b, the third protrusion 22c, and the fourth protrusion 22d are formed, and the contact adjusting plate 23 side of the protrusion fixing portion 22 is
A step surface 42a formed in a step shape is formed in the lateral width direction orthogonal to the axial direction of the socket 14.

On the other hand, the shape of the contact adjusting plate 23 can match the stepped shape of the protruding fixing portion 22, that is, the thickness in the socket 14 direction can be displaced stepwise at the pitch m and the dimension h. It has a shape. In this embodiment, the length of the contact adjusting plate 23 in the lateral 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, 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 protruding fixing portion 22 includes the second protruding portion 22b and the third protruding portion 22c.
One through hole 24 for screwing at each position
Are arranged side by side in the lateral width direction, and in the other contact adjusting plate 23, four screw holes 25 for screwing are arranged in the lateral width direction at the same pitch as the insertion holes 24 for each step formed. ing.

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

That is, in the case where there are two insertion holes 24 for screwing and four screw holes 25 as in the present embodiment, as a combination for matching the two places, the configuration of FIG. 1 and FIG. There are three types including the contact surface of the reaction force receiver 20 by displacing the attachment position of the contact adjusting plate 23 in the lateral width direction and appropriately selecting the above-mentioned form.
Position, that is, the contact surface 2 from the axial center of the socket 14.
The interval S up to 1 can be changed and adjusted in several steps.

Therefore, when the tightening / loosening device A is used, as described above, according to the distance L from the bolt head B to be tightened / disengaged to the structure end face 51 on which the reaction force receiver 20 abuts, The attachment position of the contact adjusting 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 shaft center of the socket 14 is set.

For example, when the distance S from the abutment surface 21 to the socket axis is increased, the abutment adjusting plate 23 is attached so that the side with a small thickness is brought into contact with the protruding fixing portion 22, and the aforesaid distance S is provided. Contact adjustment plate 23
The thicker side may be brought into contact with the protruding fixing portion 22 and fixed by screws. As a result, 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 structure end face 51 to perform the tightening / loosening work.

In the present embodiment, the first to fourth stepwise protrusions are provided, but the present invention is not limited to this, and the pitch m or the dimension h is made finer to provide the first to fifth protrusions. 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 fourth protrusion 22d, many combinations of the protrusion fixing portion 22 and the contact adjusting plate 23 can be considered, which is preferable.

[0027]

As described above, according to the tightening / loosening device of the present invention, the mounting position of the contact adjusting plate with respect to the projecting and fixing portion is displaced in the lateral width direction, so that the axial center of the socket and the reaction force receiving force are received. It became easier to adjust the gap between the contact surfaces.
This eliminates the need to prepare a plurality of contact adjusting plates with different thicknesses in advance as in the conventional case, and it is not necessary to select and replace one of the appropriate contact plates from the plurality of contact plates. The workability in was improved.

[Brief description of drawings]

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

FIG. 2 is a perspective view seen from below showing a state where the contact adjusting plate is separated.

FIG. 3 is a vertical cross-sectional view of a fastening device showing an internal structure.

FIG. 4 is a transverse cross-sectional view showing a state in which a space S is adjusted by changing a mounting position of a contact adjusting plate with respect to a protruding fixing portion.

FIG. 5 is a side view showing an entire conventional fastening / loosening device.

FIG. 6 is a transverse cross-sectional view in the vicinity of a reaction force reception showing a usage state of the fastening and loosening device of the previous figure.

[Explanation of symbols]

 A ... Loosening device 10 ... Device body 11 ... Casing 14 ... Socket 20 ... Reaction force receiving 21 ... Contact surface 22 ... Projection fixing part 23 ... Contact adjusting plate 24 ... Insertion hole 25 ... Screw hole

Claims (1)

[Claims] 1. A tightening device for bolts and nuts, wherein a reaction force receiver is attached to a casing of a transmission portion that drives a socket that engages with a bolt head or a nut at a lower end portion of the device body. A reaction force receiving member is fixed to the casing by a projecting fixing portion, and is attached to the projecting fixing portion by screwing means so that the reaction force receiving member can be brought into contact with a wall surface of a structure or the like to which a reaction force is to be applied. The contact adjusting plate having a contact surface parallel to the axial direction of the socket, the contact adjusting plate side of the protruding fixing portion is formed stepwise in a lateral width direction orthogonal to the axial direction of the socket, The protrusion fixing portion side of the contact adjusting plate is formed in a step shape so that the contact adjusting plate can be displaced in the lateral width direction in correspondence with the shape of the protrusion fixing portion, and the protrusion fixing portion of the contact adjusting plate. Screw holes for mounting to A plurality of the contact adjusting plates are arranged side by side in the width direction, and the contact adjusting plates are displaced in the lateral width direction with respect to the protruding fixing portion so that the distance between the socket shaft center and the contact surface in the reaction force receiving can be adjusted. A bolt and nut tightening and loosening device characterized in that