JPH06238531A - Nut fastening device - Google Patents

Abstract

PURPOSE:To reduce cost of a nut fastening device as well as to absorb center deflection between a bolt and a nut in simple constitution. CONSTITUTION:A nut fastener 2 consists of a rotating machinery 4, a point metal fitting 7 having a socket 5 holding a nut N and an alignment tool 6 and an expansion tool 9 to advance and retreat the point metal fitting 7 toward and from a bolt, and the alignment tool 6 is furnished with an adjustable joint 10 to joint the socket 5 and a rotary shaft 3 and a spring 11 to energize to the direction to separate the socket 5 and the rotary shaft 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut tightening device which can quickly screw a misaligned bolt and nut with a simple means, and more particularly to a nut tightening device which can be manufactured at low cost.

[0002]

2. Description of the Related Art For example, as shown in FIG. 7, in order to fix a wall panel p, in which face members b and c are attached to the inner and outer surfaces of a frame made by joining frame members a ... In addition, a mounting bracket d that is bolted to the upper surface of the upper frame member a may be used.

The mounting bracket d is previously bolted to the frame member a of the wall panel p in a factory. For this bolting work, the screw portion e is projected from the upper surface of the frame member a to make the frame member a.
This is done by screwing a nut f onto a bolt that is screwed into.

The screwing operation is performed by using a so-called nut tightening device in the online manufacturing of the wall panel p, but the screw part e of the bolt and the nut f are usually misaligned. For this reason, various nut devisings have been conventionally applied to follow this misalignment.

As an example of such a device, as shown in FIG. 8, a pedestal n attached to the tip of a rotary shaft m, and a nut f fitted into the pedestal n via three rubber springs r ... There is a so-called RCC device including a support s provided with a hole s1 to be formed. In this case, the support s moves to some extent in accordance with the threaded portion e of the bolt, and the misalignment between the bolt and the nut f can be absorbed.

Alternatively, as another misalignment tracking device provided in the nut tightening device, there is one that centers the nut f by image sensing in which image processing is performed by a sensor.

[0007]

However, the RC
Although the misalignment tracking mechanism using the C device has a simple structure, the hole s1 is formed by the movement of the support s during rotation transmission.
The peripheral surface surrounding the rim is likely to be worn early, and the RCC device needs to be frequently replaced.

The image sensing method is also expensive, which increases the equipment cost and also requires a long time for image processing, resulting in a decrease in tact.

The present invention is based on the fact that it has a centering tool having a universal joint and a spring, and is capable of quickly screwing a misaligned bolt and nut with a simple structure and is inexpensive to manufacture. The purpose of the present invention is to provide a nut tightening device.

[0010]

SUMMARY OF THE INVENTION The present invention is a nut having a nut stopper that holds the nut and moves and rotates the nut toward the threaded portion of the bolt to screw the nut onto the threaded portion. In the tightening device, the nut stopper includes a rotary machine, a socket for holding a nut, and a tip fitting having a centering tool arranged between the socket and a rotary shaft of the rotary machine, and a tip fitting. Is composed of an expandable / contractible member that advances and retracts toward the bolt, and the core alignment tool is a universal joint that connects the socket and the rotary shaft,
Also, a spring is provided for urging the socket and the rotary shaft in a direction of separating from each other, and a chuck tool for holding the socket is arranged until the socket abuts the bolt.

[0011]

[Operation] The nut is held by the socket of the front metal fitting, and the socket is moved toward the bolt by the expander / contractor, and the misalignment between the bolt and the nut is absorbed by the universal joint of the aligning tool. The nut is screwed onto the bolt by rotating. With such a simple structure using the universal joint, the misaligned bolt and nut can be screwed together. Therefore, the nut tightening device can be manufactured at low cost, and the screwing operation of the nut can be speeded up.

Further, the centering tool includes a spring for urging the socket and the rotary shaft in a direction to separate from each other. Therefore,
The universal joint of the centering tool can be held substantially horizontally without impairing its flexibility.

Further, since the chucking tool for holding the socket until the socket abuts the bolt, the misalignment between the bolt and the nut can be suppressed to the minimum. Make sure the nut is securely screwed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 6, the nut tightening device 1 of the present invention holds the nut N and moves and rotates the nut N toward the screw portion B1 of the bolt B to screw the nut N to the screw portion B1. It has a nut stopper 2.

The nut stopper 2 is attached to the base frame 15. The base frame 15 has a horizontal bottom plate 16 and a rear end of a horizontal upper plate 17 arranged above the horizontal bottom plate 16 connected by a vertical back plate 19, and side ends connected by a side plate 20 perpendicular to the back plate 19. . The front ends of the upper plate 17 and the side plate 20 are connected to the bottom plate 16
Located slightly behind the front edge of the.

Rollers 21A of the roller conveyor 21 are pivotally attached to the front end of the bottom plate 16, and the rear ends of the side plates 22 extending in the front and rear contact.

At the front end of the upper surface of the bottom plate 16, the roller 2 is attached.
A rectangular parallelepiped pedestal 23 whose upper surface is higher than 1A is erected, and a mounting metal fitting 24 bolted to the wall panel P in this embodiment is placed on the pedestal 23 upper surface.

In the present embodiment, the mounting metal fitting 24 is a vertical piece 24A having two holes 24a, 24a formed vertically.
Two pins 25, 25 extending horizontally from the lower end of the standing piece 24A and projecting from the upper surface of the pedestal 23 are formed in the hole 24.
a horizontal piece 24B that is placed on the upper surface of the pedestal 23 while being inserted into the b and 24b, a hanging piece 24C that hangs from the rear end of the horizontal piece 24B, and a protruding piece 24D that projects rearward from the lower end of the hanging piece 24C. Consists of. The standing piece 24A of the mounting member 24 is flush with the front surface of the pedestal 23 or slightly forward of the front surface.

Further, on both sides of the pedestal 23, mounting brackets 24 are provided.
Restraints 26 for restraining the vehicle are provided. Restraint 26
2, a protrusion 27A for pressing the horizontal piece 24B against the upper surface of the pedestal 23 is provided at the upper end and the pedestal 2
A vertical arm 27 pivotally supported by supporting plates 29, 29 protruding from the three side surfaces, and a cylinder 31 having a rod end attached to a U-shaped portion 30 pivotally attached to a lower end of the arm 27 are provided.

The mounting bracket 24 includes the cylinder 31,
By the reduction of 31, the protrusions 27A of the arms 27, 27,
27A presses the horizontal piece 24B against the upper surface of the pedestal 23, so that the pins 25, 25 are restrained together with the restraints 26, 2.
6 is immovably mounted on the upper surface of the pedestal 23.

On the roller conveyor 21, there is provided a wall panel P having two bolts B, B having screw portions B1 and B1 protruding from the rear surface of the frame member 33 and having face members 35 and 35 attached vertically. The frame member 33 is placed at a right angle to the side plate 22, and the frame member 34 on the side is brought into contact with the side plate 22 to be aligned and conveyed backward. The front end, that is, the rear end of the bolt B has a tapered portion B2 by being formed in a tapered shape.

The conveyed wall panel P is stopped by an abutment 36 provided on the upper surface of the bottom plate 16 and in the vicinity of the front end thereof, and the screw portions B1 and B1 of the bolts B and B are fixed to the mounting bracket 2.
4 is inserted into the holes 24a and 24A provided in the standing piece 24A.

In the pad 36, a screw shaft 40 having a pad plate 39, which can be brought into contact with the rear surface of the frame member 33 of the wall panel P, is attached to the front end near the upper end of a vertical base column portion 37 by nut tightening. Correspondingly, it is possible to adjust the position of the plate 39 in the front-rear direction.

The nut stopper 2 of the nut tightening device 1
In this embodiment, two bolts are provided in accordance with the two bolts B, B. However, since the configurations are the same, only one will be described in this specification.

The nut stopper 2 is the back plate 1 of the base frame 15.
9. A rotary machine 4 for rotating the attachment rotary shaft 3 on the rear surface, and as shown in FIG. 4, a nut N is fitted into a concave portion 42 having an opening having a narrow taper portion 41 whose diameter is reduced rearward at the front end. By doing so, a tip 5 having a socket 5 for holding the nut N, and a centering tool 6 arranged between the socket 5 and the rotating shaft 3 of the rotating machine 4, and the tip 7 are attached to the bolt. It comprises an expandable / contracting device 9 which is advanced and retracted toward B and is arranged concentrically with the rotating machine 4 on the front surface of the back plate 19.

Further, the centering tool 6 is a universal joint 10 made of, for example, a universal joint connecting the socket 5 and the rotary shaft 3 projecting from the front end of the expansion / contraction tool 9, and the socket 5 while being wound around the universal joint 10. The spring 11 is provided between the flange portion 44 provided at the rear end and the flange portion 45 provided at the front end of the rotary shaft 3 and urges the socket 5 and the rotary shaft 3 in a direction to separate them from each other.

By this spring 11, the universal joint 10 is held substantially horizontal while maintaining its flexibility.

A chucking tool 12 for holding the socket 5 is provided until the socket 5 is moved forward by the operation of the expansion / contraction tool 9 and abuts on the bolt B.

As shown in FIGS. 1 and 2, the chuck tool 12 has a rail 47 having a trapezoidal cross section extending before and after being mounted on the lower surface of the upper plate 17 of the base frame 15, and slidably fitted on the rail 47. A support 52 to be worn, a plate-like horizontal upper piece 50 fixed to the lower surface of the support 49, and a moving tool 52 composed of a hanging piece 51 hanging from the front end of the upper piece 50, and a moving tool 52. A columnar joint 53 in front of the hanging piece 51 of
A rotary actuator 55 such as an air cylinder attached via a rotary actuator 55, and holding pieces 57 and 57 for holding and holding the socket 5 at the lower end while the upper end is attached to the support shafts 56 and 56 projecting forward from the rotary actuator and 55. A chuck tool main body 12A including a pair of hanging plates 59, 59 provided with is provided.

However, the mounting bracket 24 is attached to the pedestal 23.
The mounting bracket 24 is immovably supported by the pins 25, 25 and the restraints 26, 26. After that, the side wall 22 of the wall panel P is placed along the side plate 22 and the frame member 3 is attached to the pad plate 39 of the pad 36 by the roller conveyor 21.
3 Backward until the rear surface comes into contact with the frame member 33 in advance.
The bolts B and the threaded portions B1 and B1 of the bolts B that are screwed in are inserted into the holes 24a and 24a of the mounting member 24. At this stage, the standing piece 24A of the mounting member 24 contacts the frame member 33.

Further, while the socket 5 is held substantially horizontally by the chuck tool 12, the expander / contractor 9 is operated to fit the nut N into the recess 42 and hold the socket 5, and the screw portion B1 of the bolt B The nut N is moved forward until it contacts the nut N.

At this stage, as shown in FIGS. 3 and 5, the pair of hanging plates 59, 59 of the chuck 12 is separated by the operation of the rotary actuator 55, and the chuck 1
The holding of the socket 5 by 2 is released.

The center line L of the screw portion B1 of the bolt B is
1 and the center line L2 of the nut N are misaligned as shown in FIG. 4, but the center line L1 is a horizontal line passing through the front end of the taper portion 60 provided at the front end of the thread portion N1 of the nut N. If it exists in the area surrounded by the straight lines L3 and L3, the misalignment can be absorbed by the tapered portion B2.

Further, by rotating the rotary shaft 3 of the rotating machine 4, the universal joint 10 is bent, for example, as shown in FIG. 6, and the nut N is screwed to the threaded portion B1. The mounting bracket 24 is mounted on the frame member 33 of the wall panel P.

As described above, the nut tightening device 1 has the bolt B
The misalignment of about 1/2 of the diameter of the screw portion B1 can be absorbed. Further, a centering tool 6 including a universal joint 10 and a spring 11
Since the alignment is performed by using, the structure can be simplified and the cost can be reduced.

The nut tightening device 1 of the present invention can be used for screwing various bolts and nuts in addition to the one in which the mounting bracket 24 is bolted to the wall panel P.

[0037]

As described above, the nut tightening device of the present invention is
Between the socket holding the nut and the rotating shaft of the rotating machine,
Since the centering tool with the universal joint is arranged, the misaligned bolt and nut can be screwed by bending the universal joint, and the nut tightening device can be manufactured with a simple structure at low cost, and the equipment cost can be reduced. Can be reduced.

Further, since the centering tool has a spring for urging the socket and the rotary shaft in the direction of separating from each other,
This spring prevents deformation of the universal joint due to its own weight,
Misalignment between the bolt and the nut can be suppressed.

Further, since the chucking tool for holding the socket until the socket abuts the bolt, the displacement of the socket can be prevented.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a perspective view thereof.

FIG. 3 is a side view of the nut tightening device showing a state where the socket is in contact with the bolt.

FIG. 4 is an enlarged sectional view showing a socket.

FIG. 5 is a front view showing the operation of the chuck tool.

FIG. 6 is a partial side view showing the operation of the centering tool.

FIG. 7 is a perspective view exemplifying a mounting fitting bolted by the nut tightening device of the present invention.

FIG. 8 is a partial perspective view illustrating a conventional technique.

[Explanation of symbols]

 2 Nut stopper 3 Rotating shaft 4 Rotating machine 5 Socket 6 Core aligning tool 7 Tip metal fitting 9 Expanding tool 10 Universal joint 11 Spring 12 Chuck tool B Bolt B1 Screw part N nut

Claims (1)

[Claims] 1. A nut tightening device having a nut stopper that holds a nut and moves and rotates the nut toward the threaded portion of the bolt to screw the nut onto the threaded portion. The stopper is a tip fitting having a rotating machine, a socket for holding a nut, and a centering tool arranged between the socket and the rotary shaft of the rotating machine, and the tip fitting is advanced and retracted toward the bolt. The core aligning tool comprises a stretchable tool, and the centering tool includes a universal joint connecting the socket and the rotary shaft, and a spring for biasing the socket and the rotary shaft in a direction to separate the socket from each other. A nut tightening device with a chuck tool that holds this socket until it contacts.