JPS632298Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bolt tightening device.

Conventional bolt tightening devices temporarily hold the bolt with chuck claws and then tighten the bolt into the bolt hole of the workpiece. Therefore, it is necessary to have a tightening space where the chuck pawl is close to the workpiece and where the chuck pawl can expand. For example, when a bolt hole is located in a recessed part of the workpiece, the tightening space cannot be secured and the bolt In some cases, it became impossible to tighten the Further, since tightening is started in a state where the tip of the shaft of the bolt is difficult to see, alignment of the bolt with the bolt hole is uncertain.

Therefore, in view of the above-mentioned conventional drawbacks, the purpose of this invention is to make it possible to tighten a bolt into a bolt hole in a recessed part of a workpiece, and to ensure that the bolt is aligned with the bolt hole. An object of the present invention is to provide a bolt tightening device.

In order to achieve the above object, this invention provides a suction means capable of adsorbing the bolt to the socket part of the spindle that provides forward force and rotational force to the bolt, and the socket part of the spindle temporarily holds the bolt. The chuck claws for this purpose can be expanded and moved forward.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, which shows a partially cutaway left side of the bolt tightening device, a cylindrical guide tube 2 is fixed to the front part of the body 1 along the front-rear direction. A cylindrical charging tube 3 is connected to the upper center of the guide tube 2 so as to be inclined toward the front. A feed tube 4 of a bolt supply device (not shown) is communicated with this charging tube 3. The bolt supply device is adapted to feed the bolts B individually from the feed tube 4 to the guide tube 2 with the shaft portion _B1 facing forward.

Three chuck claws 5 to 5 are rotatably attached to the tip of the guide tube 2 with pins 6, respectively. Each chuck pawl 5 to 5 is always biased in the closing direction by a torque spring 7 to 7 fitted into a pin 6 and interposed between the chuck pawl 5 and the guide cylinder 2. The claws 5 to 5 form a conical cylinder whose tip is narrowed. Each of the chuck claws 5 to 5 has a holding hole 8 formed at its tip into which the shaft portion _B1 of the bolt B can be inserted in a substantially tight fit. Also,
A base end of a leaf spring 9 corresponding to a closing piece is fixed to the outside of one of the chuck claws 5,
The tip of the leaf spring 9 is bent so as to close the holding hole 8. This leaf spring 9 prevents the tip of the shaft of the bolt B from protruding forward of the chuck pawls 5 to 5 due to the inertial force of the bolt B supplied from the charging tube 3. As a result, the chuck claw 5
~5 and the head _B2 of the bolt B are in an open state, and the socket part 14, which will be described later, is connected to the head of the bolt B.
Since the time (stroke) from when the chucks 5 to 5 start to expand after contacting _B2 is obtained, the reliability of the attraction of the magnet 15 of the socket portion 14 to the bolt B is improved.

A base end of a stopper piece 10 is rotatably attached to the upper part of the guide tube 2 between the input tube 3 and the chuck claws 5 to 5 with a pin 11. This stopper piece 10 is fitted onto a pin 11 and is always biased clockwise in FIG. 1 by a torque spring 12 interposed between the stopper piece 10 and the guide cylinder 2. The lower surface of the base of the stopper piece 10 is in contact with the slope 2a of the guide tube 2, and the lower tip of the stopper piece 10 is in a state of protruding into the guide tube 2. This stopper piece 10 is connected to the chuck claws 5 to 5.
The bolt B fitted into the holding hole 8 of No. 5 is prevented from returning.

The tip of a spindle 13 is fitted into the rear part of the guide tube 2. A socket portion 14 that can be engaged with the head _B2 of the bolt B is formed at the tip of the spindle 13, and a magnet 15 is attached to the back of the socket portion 14. This spindle 1
A rotating shaft 17 of a motor 16 is connected to the terminal end of the bolt B, so that the spindle 13 is actively rotated in the direction in which the bolt B is tightened. This motor 1
6 is an air cylinder 18 attached to the rear of the aircraft 1
is fixed to the rod 19 via a bracket 20. Note that the bracket 20 slides along a guide bar 21 installed in the longitudinal direction of the aircraft body 1.

The operation of the bolt tightening device described above will be described. First, the bolt B is actively fed from the bolt feeding device to the guide tube 2 via the feed tube 4. The shaft portion _B1 of this bolt B is pushed into the chuck pawl 5 by the inertia force applied by the bolt supply device.
-5 into the holding holes 8 (state shown in Fig. 1). At this time, when the head B ₁ of the bolt B passes, the lower end of the stopper piece 10 is floated against the bias of the torque spring 12, and after the head B ₁ passes, the lower end of the stopper piece 10 is floated by the bias of the torque spring 12. Return to original state. Next, when the motor 16 is driven and the rod 19 of the air cylinder 18 is extended, the spindle 13 rotates and moves forward. This advancing spindle 13
The head of the bolt B, which is temporarily held by the chuck claws 5 to 5, is lifted up by the tip of the stopper piece 10 against the bias of the torque spring 12.
The socket part 14 is fitted into _B1 . This bolt B
is attracted to the magnet 15 by its magnetic force while being fitted into the socket portion 14. Furthermore, spindle 1
3, move forward with bolt B attached, and chuck claw 5
-5 against the bias of each of the torque springs 7-7, and push open the plate spring 9 against the bias, and then chuck the socket portion 14 with the same bolt B into place with the chuck claw 5.
~5 Protrude forward (see Figure 3). and,
The bolt B is tightened into a bolt hole of a workpiece (not shown) by the forward force and rotational force of the spindle 13.

After the tightening is completed, the motor 16 stops and the rod 19 of the air cylinder 18 is shortened. As the spindle 13 returns, the leaf spring 9 returns to its original state due to its energization, and the chuck pawls 5 to 5 and The stopper piece 10 is connected to the torque spring 7 or 12.
It returns to its original state with the help of

The bolt tightening device described above can be used in a fixed manner by installing the fuselage 1 on a frame and a support stand, or can be used in a fixed manner by attaching a handle to the motor 16 and operating the motor 16 and the air cylinder 18 with a trigger. By doing so, it can be used as a hand tool. Further, in the above embodiment, the magnet 15 is shown as a means for attracting the bolt B, but as shown in FIG. A coupler 23 having an annular groove 24 on the inner periphery of the spindle 13
is attached via the seal 25 to communicate the ventilation path 22 and the annular groove 24, and the annular groove 24 of the coupler 23
It is also possible to connect a tube 27 leading to a vacuum source (not shown) to the connecting pipe 26 which communicates with the socket, and to adsorb the head _B2 of the bolt B fitted into the socket part 14 by vacuum pressure.

That is, in this invention, a suction means capable of suctioning the bolt is attached to the socket part of the spindle that provides forward force and rotational force to the bolt, and the socket part of the spindle expands the chuck claw for temporarily holding the bolt. Since the bolt opens and moves forward, if the spindle can intervene, the bolt can be tightened into the bolt hole in the recessed part of the workpiece while the bolt is attracted to the socket of the spindle. In addition, since the bolt can be tightened while looking at the bolt shaft, alignment of the bolt with the bolt hole is ensured.

In particular, in the present invention, the chuck pawl is provided with a closing piece (a leaf spring in the embodiment) that can close the tip of the holding hole by the chuck pawl via an elastic means. The tip of the shaft of the bolt is prevented from protruding forward of the chuck pawl due to inertial force, and the shaft tip of the bolt is prevented from protruding into the guide cylinder through an elastic means and cooperates with the holding hole and the closing piece formed by the chuck pawl. Since the stopper piece is arranged to temporarily hold the bolt, the bolt is temporarily held in the same axis as the socket, improving the reliability of suction of the bolt head to the socket. It has the unique effect of being able to tighten bolts not only in the downward direction, but also in all directions, including horizontally and upwards.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention. Figure 1 is a partially cutaway left side view of the bolt tightening device, Figure 2 is an enlarged front view of the same, and Figure 3 is a spindle moving forward. FIG. 4 is a partially cutaway left side view of the bolt tightening device in a state where the bolt tightening device is in a closed state, and FIG. 4 is a schematic cross-sectional view showing another example of the suction means. DESCRIPTION OF SYMBOLS 1...Body, 2...Guide tube, 3...Insertion tube (inlet), 5...Chuck claw, 7...Torque spring (elastic means), 9...Plate spring (closing piece), 12...
Torque spring (elastic means), 14... socket part,
15...Magnet, 16...Motor, 18...Air cylinder.

Claims (1)

[Scope of utility model registration request] The fuselage is provided with a cylindrical guide tube, a slot for inserting bolts is provided in the center of the guide tube, and a plurality of chuck claws for temporarily holding the bolts are provided at the tip of the guide tube. The guide tube is provided so that it can be opened and closed and is biased in the closing direction by elastic means, and a spindle that is actively rotated in the tightening direction of the bolt is inserted into the rear part of the guide tube, and the head of the bolt is attached to the tip of the spindle. A socket portion is formed which can be engaged with the bolt, and this socket portion is provided with suction means capable of suctioning the head of the bolt, and the socket portion is configured to hold the chuck pawl against the bias of the elastic means. A bolt tightening device configured to expand and protrude forward, the chuck pawl being provided with a closing piece capable of closing the tip of the holding hole formed by the chuck pawl via an elastic means, A bolt tightening device characterized in that a stopper piece is disposed in the guide cylinder, the stopper piece projecting into the cylinder through an elastic means and cooperating with the holding hole formed by the chuck pawl and the closing piece to temporarily hold the bolt.