JPS6322056Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a socket for a stud bolt that is attached to a rotary shaft driven by rotation of a nut runner and screws the stud bolt into a workpiece.

<Prior art> Conventionally, sockets for stud bolts were
As shown in Publication No. 51-1877, a cylindrical outer case is connected to a rotatable shaft, a nail box is placed inside the outer case, and the nail box is opened and closed around a pivot pin inside the nail box. At least two collet pawls are arranged, and a female thread for screwing the stud is formed on the inner periphery of the lower end of these collet pawls, and a hemispherical dredge is formed below the pivot pin on the outer surface of the collet pawl. A shallow longitudinal groove is continuously formed above the pivot pin, a hemispherical dredge and a locking ball that engages with the longitudinal groove are held in a claw box, and a cylindrical screw is connected to the pivot pin with a push spring that pushes the collet claw upward. and the nail box. When a socket constructed in this way is to be disconnected from a stud screwed into the article and screwed into the female thread of the collet pawl, the shaft is raised so that the pawl box presses against the collet pawl with a spring. It rises while being bent, and the position where it engages with the locking ball shifts from a hemispherical dredge to a vertical groove, the female threaded side of the collet pawl opens around the pivot pin, and the bolt is separated from the butt. When the bolt is removed from the socket, the collet pawl opens around the pivot pin, so the upward force acting on the collet pawl due to the push spring concentrates on the upper end of the threaded portion of the bolt, deforming the upper end of the screw. Next, there was the problem that the nut that was screwed onto the bolt would not fit.

<Purpose of the invention> In order to solve the above-mentioned problems, the purpose of the invention is to apply force only to the upper end of the male thread of the bolt when separating the socket from the workpiece and the stud socket screwed into the socket. To provide a socket for a stud bolt that does not act in a concentrated manner.

<Configuration of the invention> The socket for a stud bolt according to the invention has a drive shaft with a tapered hole formed at the lower end attached to the rotary shaft that is rotationally driven by the nut runner, and a threaded socket with a female thread formed at the lower end into which the stud bolt can be screwed. The members are connected with a pin or the like so that they can be expanded and contracted along the tapered hole in a direction perpendicular to the axis of the drive shaft, and a pressure spring that presses the threaded member against the tapered hole is interposed between the threaded members. The drive shaft is provided with an engaging member that engages with a vertical guide groove formed on the outer surface of the mating member.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, reference numeral 10 denotes a movable body that is moved horizontally and vertically, and a nut runner 11 is fixed to this movable body 10. Reference numeral 12 denotes a rotating shaft on which the nut runner 11 is rotationally driven.The rotating shaft 12 has a spline 13 on its outer periphery, a blind hole 14 formed inside thereof, and a rod 15 that is inserted through the blind hole 14 is fixed thereto. Rod 15 to Rod 15
A washer 16 that comes into contact with the head of the blind hole 14 is inserted, and a coil spring 17 is inserted between the end face of the blind hole 14 and the washer 16.
is interposed.

Next, the stud socket 41 attached to the rotating shaft 12 will be explained. A spline 19 that engages with the spline 13 is formed on the intermediate shaft 18 connected to the rotating shaft 12, a drive shaft 20 is connected to the lower end of the intermediate shaft 18 with a pin 21, and a washer 16 connects the intermediate shaft 18 and the drive shaft. It is sandwiched between 20. When the movement of the drive shaft 20 is blocked despite the descent of the nut runner 11, the intermediate shaft 18
is adapted to move axially relative to the rotating shaft 12 by overcoming the force of the coil spring 17. The drive shaft 2
A tapered hole 22 is formed inside the lower end of the drive shaft 20, and a plurality of holding holes 23 are formed in a direction perpendicular to the axis of the drive shaft 20 between the tapered holes 22 of the drive shaft 20, and a drive ball 24 is inserted into the holding hole 23. , a cover 2 is provided on the outer surface of the drive shaft 20 to prevent the drive ball 24 from falling off.
5 is installed. A drive shaft 2 is attached to the drive shaft 20.
A through hole 26 in the axial direction of 0 is formed, and the through hole 2
A stopper 27 is slidably inserted into the stopper 6, and a pin 28 is fixed to the stopper 27 in a direction perpendicular to the axis of the stopper 27.
A communication hole 29 is formed in the same direction as the pin 28 . A pair of screwing members 31 having a pin hole 30 through which the pin 28 is inserted are connected to the pin 28 so as to be slidable in the same direction as the pin 28, and a pressing spring 33 presses the screwing members 31 against the tapered hole 22. Communication hole 29
It is interposed between the screw members 31 inside. The head of the stud bolt 34 comes into contact with the stopper 27, and the screw member 31 is moved upward to release the engagement between the female thread of the screw member 31 and the male screw of the stud bolt 34, which will be described later. The screwing member 31 is rotated relative to the bolt 34.
A guide groove 32 slightly inclined in the circumferential direction that engages with the drive ball 24 is formed on the outer surface of the stud bolt 34 without expanding the threaded member 31 in a direction perpendicular to the axis of the drive shaft 20. It consists of a vertical portion 32a formed in the vertical direction to rotate the screwing member 31 relative to the tapered hole 22, and an inclined portion 32b formed substantially parallel to the tapered hole 22. The rotation of the drive shaft 20 is transmitted to the screw member 31 via the drive ball 24, and the screw member 31 moves up and down with respect to the drive shaft 20 along the tapered hole 22 in a direction perpendicular to the axis of the drive shaft 20. It is growing and shrinking. When the threaded member 31 rises relative to the drive shaft 20 and contracts in the direction perpendicular to the axis of the drive shaft 20, the stud bolt 34 can be threadedly engaged, and when it descends relative to the drive shaft 20 and contracts in the direction perpendicular to the axis of the drive shaft 20, the stud 34 can be threaded. A female thread 35 is formed at the lower end of the threaded member 31, which allows the stud bolt 34 to be separated when expanded in the right angle direction. A cylindrical member 36 is fitted onto the outer surface of the drive shaft 20 so as to be slidable in the vertical direction.
A gripping member 37 divided into three equal angular intervals that can be expanded in a direction perpendicular to the axis of 0 is fixed, and a stud bolt 3 is attached to the gripping portion 37a at the lower end of the gripping member 37.
The gripping member 37 is attached to the drive shaft 20 so that the gripping member 37 can grip the
An elastic ring 38 is mounted which applies a force in the direction of contraction perpendicular to the axis of the tube. By means of the gripping member 37 and the elastic ring 38, the stud 34, which is set upright at the bolt supply position, can be gripped by the gripping portion 37a and transferred onto the work W by the movement of the nut runner 11, and the stud 34 can be transferred onto the work W. The stud bolt 34 is held so that it does not fall down when screwed in. Intermediate shaft 1
A compression spring 39, which is relatively stronger than the coil spring 17, is interposed between the protruding portion 18a of No. 8 and the cylindrical member 36 to press the cylindrical member 36 downward. When the gripping member 37 comes into contact with the workpiece W, the gripping member 3
7 can escape against the compression spring 39.

Next, as an explanation of the operation, first, the operation of tightening the stud bolt 34 into the screw hole 40 formed in the work W will be explained. The screwing member 31 has a female thread 35
drive shaft 2 so that stud bolt 34 can be inserted into
While rotating the stud socket 41 in a state where it is expanded in the direction perpendicular to the axis of the drive shaft 20 at a position lowered from 0, it is lowered to the stud bolt 34 temporarily tightened in the screw hole 40 of the workpiece W. The stud 34 is inserted through the grip portion 37a and the female screw 35, and the head of the stud 34 comes into contact with the stopper 37. When the stud socket 41 is further lowered, the threaded member 31 is moved to the stopper 27 and the pin 28.
The male thread of the stud 34 engages with the female thread 35 of the screwing member 31 as it ascends relative to the drive shaft 20 through the threads and contracts in a direction perpendicular to the axis of the drive shaft 20 . Further, when the stud socket 41 is lowered while being rotated, the stud bolt 34 is screwed into the screw hole 40 of the workpiece W, resulting in the state shown in FIG. 1.

Next, the operation of separating the stud bolt 34 from the female thread 35 of the screwing member 31 will be explained. From the state shown in Figure 1, insert the socket 4 for the stud bolt.
1, the guide groove 32 is slightly inclined in the circumferential direction, so the threaded member 31 is aligned with the drive shaft 20.
2, the female thread 35 of the screw member 31 and the stud bolt 34 are rotated in a direction to loosen the stud bolt 34 and the screw member 31, thereby creating a gap between the stopper 27 and the stud bolt 34 as shown in FIG. The biting with the male screw is released. When the stud socket 41 is further raised, the threaded member 31 is engaged with the stud bolt 34, so that the threaded member 31
The stud socket 41 rises with the stud remaining in place, and the threaded member 31 expands in a direction perpendicular to the axis of the drive shaft 20 due to the pressure spring 33, and as shown in FIG. is separated.

<Effects of the invention> As described above, in the present invention, a drive shaft with a tapered hole formed at the lower end is attached to the drive shaft which is rotationally driven by the nut runner, and a screw having a female thread formed at the lower end into which a stud bolt can be screwed is attached. Connecting the mating members along the tapered hole so as to be expandable and contractible in a direction perpendicular to the axis of the drive shaft with a pin or the like, interposing a pressure spring between the threaded members to press the threaded member against the tapered hole, Since the drive shaft 20 is provided with an engaging member that engages with the vertical guide groove formed on the outer surface of the threaded member, when the socket is separated from the workpiece and the stud screwed into the socket, With the male thread of the stud bolt hooked onto the fully female thread, the threaded member expands along the tapered hole in a direction perpendicular to the axis of the drive shaft. Therefore, there is an advantage that there is no risk of deformation due to force acting on only a portion of the bolt thread.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional overall view of a stud socket according to the present invention, and FIGS. 2 and 3 show the operation of separating the stud bolt from the stud socket. A cross-sectional view showing the state. 12... Rotating shaft, 20... Drive shaft, 22... Tapered hole, 34... Drive ball, 28... Pin, 3
DESCRIPTION OF SYMBOLS 1... Threaded member, 32... Guide groove, 33... Pressing spring, 34... Stud bolt, 35... Female thread.

Claims (1)

[Scope of utility model registration request] A drive shaft with a tapered hole formed at the lower end is attached to the rotation shaft of the nut runner, and a pair of threaded members each having a female thread formed at the lower end into which a stud can be screwed is attached along the tapered hole to the axis of the drive shaft. Connected with pins etc. so that it can be expanded and contracted in the direction perpendicular to the
A pressing spring that presses the threaded member against the tapered hole is interposed between the threaded members, and an engagement member that engages with a vertical guide groove formed on the outer surface of the threaded member is provided on the drive shaft. Socket for stud bolt.