JPH0753864Y2 - Tightening device with bolt holding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tightening device with a bolt holding mechanism capable of performing a tightening operation by always holding a proper posture of a bolt in automatic tightening of the bolt.

(Prior Art) Conventionally, for example, in a bolt tightening device in which a tightening socket that is movable back and forth is provided in a cylindrical holder that communicates with a bolt supply path, the tightening is performed on a bolt head supplied into the cylinder. A tightening device is known in which a socket is fitted and a bolt shaft tip protruding from a cylinder tip is tightened while being pushed into a bolt hole of a tightened portion. In addition, it is common to supply such bolts by air pressure or the like, and in order to prevent the bolts that have been pressure-fed toward the tip of the tubular holder from jumping out from the tip of the tubular holder, It is also common to provide a bolt retaining mechanism in the.

Such a holding mechanism is configured as a pop-out prevention mechanism as shown, for example, in Japanese Utility Model Laid-Open No. 61-71326. In this mechanism, the pop-out prevention member is made to face the tip of the cylindrical holder, and the tip of the bolt shaft to be pressure-fed. It is configured to block the portion and hold the bolt, and to retract the pop-out prevention member from the tip of the cylinder when the apparatus main body that advances toward the fastened portion comes close to the tightened portion of the work to a predetermined distance.

(Problems to be solved by the invention) However, in the above-described holding mechanism, the bolt is released from being held before the bolt is brought into contact with or inserted into the tightening portion of the work, and at this time, the bolt head is tightened with the tightening socket. Since it was before the mating, the bolts tended to fall over, which was a cause of problems such as poor tightening and damage to the work.

Further, generally, a conventional holding mechanism of this kind releases the holding of the bolt before the bolt is brought into contact with or inserted into the tightening portion, or the bolt head is engaged before the tightening socket is fitted. There are many types of either holding or unfastening, and the above-mentioned problems such as poor tightening are likely to occur.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a cylindrical holder (7).
In a bolt tightening device having a retractable tightening socket (8) inside, a cylindrical holder (7) comprises a fixed holder (9) and a movable holder (10), and the fixed holder (9) A kick bar (11) that moves back and forth in conjunction with the forward / backward movement of the tightening socket (8) is attached to the outer peripheral portion of the stopper pin (16) via the bracket (10c) to the outside of the movable holder (10). ) And push the stopper pin (16) from outside to make the movable holder (10) movable,
A chuck body (21) that swings around the pin shaft (22) by the action of the kick bar (11) is provided at the tip of the movable holder (10), and the pin shaft (22) of the chuck body (21) is attached to the chuck body (21). A pair of chuck claws (24, 24) are provided on the sandwiched front side, and a roller (25) engaging with the kick bar (11) is provided on the rear side, and the kick bar (11) and the stopper pin (16) are provided. It is characterized in that it is arranged outside the cylindrical holder (7).

(Operation of the Means) The pair of chuck claws provided on the chuck body holds the bolt fed by pressure. Eventually, the tightening socket moves forward in the cylinder and fits on the head of the bolt to position the bolt at the tightening part of the work, but at the same time the kick bar that moves forward in conjunction with the tightening socket engages the roller of the chuck body. Then swing the chuck body to retract the chuck claws to a place that does not interfere with tightening. At this time, by adjusting so that the chuck claws are released when the bolt shaft is inserted into the bolt hole, the bolt does not fall.

(Embodiment) An embodiment of the fastening device of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a side view showing the tightening device with the present bolt holding mechanism, and FIGS. 2 and 3 are enlarged views of the tip chuck portion.

As shown in FIG. 1, the fastening device of the present invention is configured as a fastening tool for attaching the clutch cover 2 to the flywheel 1 of the engine, and has a plurality of main bodies 4 whose base ends are fixed to the support member 3. However, it can be moved back and forth (left and right direction in FIG. 1) by a drive source (not shown).

The main body 4 is a socket support shaft 6 that is rotated by a nut runner 5 attached to the support member 3 side.
And a cylindrical holder 7 accommodating the socket support shaft 6, and a tightening socket 8 is screwed to the tip end side of the socket support shaft 6.

The cylindrical holder 7 includes a fixed holder 9 on the base end side and a movable holder 10 on the tip end side. Of these, the base end flange portion of the fixed holder 9 is fixed to the support member 3, and the kick bar 11 is fixed to one side of the first bracket 9a formed to project to the front side and is described later on the other side. The guide bar 12 is inserted slidably.

The movable holder 10 has a sliding cylinder 10a that slides in the cylinder of the fixed holder 9 and a bolt supply cylinder 10b on the front side joined together to form a unit, and a second bracket 10c is provided at the joint. The guide bar 12 is screwed on one side of the second bracket 10c, and the slide bar 11 is slidably inserted on the other side. Also bolt supply cylinder 10b
A bolt feed pipe 13 for pressure-feeding the bolt B is joined to and communicates therewith, and a chuck main body 21 is attached to the overhanging portion on the front side thereof. On the other hand, a ring-shaped spring stopper member 14 is fitted around the outer periphery of the sliding cylinder 10a behind the second bracket 10c described above.
A spring 15 is interposed between the first bracket 9a and the first bracket 9a. Further, a stopper pin 16 is provided on the second bracket 10c so as to abut against a stopper plate (not shown) for forward positioning.

Therefore, when the device body 4 moves forward and the tip of the stopper pin 16 contacts the stopper plate, the movable holder 10
The sliding cylinder 10a slides in the cylinder of the fixed holder 9 by the fixed sides of the fixed holder 9, the kick bar 11, the socket support shaft 6 and the like, which are regulated to move forward and move forward while compressing and contracting the spring 15, as shown in FIG. The state becomes as shown in.

The kick bar 11 has a columnar shape on the rear end side, a tapered portion is formed on the tip end, and the tip taper portion is detachable from the chuck body 21.

That is, as shown in FIG. 2 and FIG.
Reference numeral 21 denotes a bolt supply cylinder 10b of the movable holder 10, which is pivotally attached to the protruding portion of the tip of the bolt supply cylinder 10b by a pin shaft 22, a spring 23 on the rear side biases the chuck claw 24 at the tip toward the cylinder tip side, and a back surface of the spring 23. A roller 25 is provided on the side. When the kick bar 11 moves forward, the taper portion of the kick bar 11 engages with the roller 25 and swings the chuck claw 24 in the direction to disengage it from the cylinder tip, as shown in FIG.

As shown in FIG. 4 which is a view taken in the direction of arrow A of FIG. 2, the chuck claws 24 include a pair of springs 28 and respective plates 28 on a base 27 which is fixed to the chuck body 21 by retaining pins 26.
Half-opened openings 30 for holding the shaft portion of the bolt B are provided at the positions supported by 29 and forming a pair, and facing the tip of the cylinder. The opening 30 is formed in a taper shape having a wide cylinder tip side and a narrow side facing the work and a diameter substantially equal to that of the bolt B axis.
The shaft portion of the bolt B that has been pressure-fed in the bolt feed pipe 13 can be smoothly inserted and held by the spring force. Further, the front surface side of each chuck claw 24 is provided with a taper portion 24a at one end side in order to avoid interference with the front surface work when swinging.

When the bolt B is pressure-fed from the bolt feed pipe 13 to the tightening device body 4 thus configured, it is gripped by the chuck claw 24 through the bolt supply tube 10b. Next, the apparatus body 4 advances, the stopper pin 16 contacts a stopper plate (not shown) at a predetermined position, and the movable holder 10 cannot move any further. When the apparatus body 4 further advances, the tightening socket 8 in the cylindrical holder 7 advances to a position for holding the head of the bolt B, and the screw portion at the tip of the bolt shaft slightly enters the tightening hole of the flywheel 1. , Kick bar 11
The chuck body 21 engaged with starts swinging. Eventually, the chuck body 21 is rocked and retracted to a place where it does not interfere with tightening, and then tightened by the nut runner 5.
Since the chuck is released after the threaded portion of the bolt B has entered the tightening hole, the bolt does not fall.

The thinner the chuck claw 24 in the side view, the thinner the better.

(Effect of the Invention) As described above, the tightening device with a bolt holding mechanism of the present invention does not require a special drive source for driving the chuck body, and can be inexpensively and simply configured. Further, since the socket support shaft supporting the tightening socket and the kick bar move in synchronism with each other, the timing of holding the bolt head and releasing the chuck is accurate, and the tightening failure due to tilting or tilting of the bolt does not occur.

And since the stopper pin is provided outside the cylindrical holder, if the shape of the workpiece changes, it is only necessary to replace the stopper pin and the stopper pin is exposed, so replacement work is extremely easy. Become.

Also, since the kick bar is provided outside the cylindrical holder, when changing or adjusting the gripping timing of the bolt, all that is necessary is to replace the kick bar or adjust the taper surface at the tip. Since it is exposed, the work is extremely easy.

[Brief description of drawings]

FIG. 1 is a side view of the tightening device with the bolt holding mechanism, and FIG.
3 and 4 are enlarged views of the chuck portion, and FIG. 4 is A of FIG.
It is a front view of the chuck | zipper part seen from the direction. In the figure, 1 is a flywheel, 4 is a main body, 5 is a nut runner, 7 is a cylindrical holder, 8 is a tightening socket, 9 is a fixed holder, 10 is a movable holder, 11 is a kick bar, 13 is a bolt feed pipe, 16 is a stopper pin, 2 is a chuck body, 22 is a pin shaft, 24 is a chuck claw, 25 is a roller, and B is a bolt.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-34500 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A bolt tightening device having a cylindrical holder (7) internally provided with a tightening socket (8) capable of advancing and retracting, wherein the cylindrical holder (7) is a fixed holder (9) and a movable holder (10). ) And the tightening socket (8) on the outer periphery of the fixed holder (9).
Attach the kick bar (11) that moves back and forth in conjunction with the forward and backward movement of the, and attach the stopper pin (16) to the outside of the movable holder (10) via the bracket (10c), and then from the outside to the stopper pin (16). The movable holder (10) can be moved by pressing, and a chuck body (21) that swings around the pin shaft (22) by the action of the kick bar (11) is provided at the tip of the movable holder (10), A pair of chuck claws (24, 24) are provided on the tip side of the chuck body (21) sandwiching the pin shaft (22),
A roller (25) that engages with the kick bar (11) on the rear end side
And a kick bar (11) and a stopper pin (16) arranged outside the cylindrical holder (7).