JPH0325252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rivet fastener that can tighten a plurality of members from one side of the member when fastening the rivets. be.

(Prior art and its problems) An example of a rivet is shown in FIG. 4.

The rivet 9 is a cylindrical body 91 with a flange, which has a flange 92 at one end and has a plurality of slits 97 in the axial direction.
On the other hand, a shaft body 94 having a head 93 at one end and approximately twice the length of the cylindrical body is fitted from the opposite side of the collar 92.

The shaft body 94 has a groove 96 for breaking on the head 93 side, and an uneven surface 95 for preventing slipping is formed on the portion extending from the collar.

Tightening with a rivet is carried out by penetrating the members 98 and 99 to be fastened, fitting the rivet cylinder 91, and tightening the collar 92 with the fastener 10, as shown in FIG. 3A.
While holding down, pull the protruding part of the shaft body 94.

As shown in FIGS. 3B and 3C, the head 93 of the shaft 94 compresses the cylinder 91 and expands the cylinder outward to cause buckling deformation. ，
99 to hold the clamping pressure.

Further, by pulling the shaft 94, the shaft 94 is broken from the breaking groove 96 as shown in FIG. 3D, and the tightening is completed.

As shown in FIG. 5, the conventional rivet tightening tool for tightening the rivet has a slide member 7 equipped with a clamp device 8 for gripping the shaft of the rivet disposed in a guide tube 2 so as to be capable of linear reciprocating movement, and A screw hole 70 is provided at the rear of the member 7, and a screw shaft 42, which is continuously driven by the motor 3 via the speed reduction device 4, is screwed into the screw hole 70.

The screw thrust generated by the rotation of the screw shaft 42 pulls the slide member 7 and the clamp device 8 backward. Further, by reversing the motor 3, the slide member 7 is moved forward and returned to its original position.

The above-mentioned fastener is inefficient in converting the rotation of the screw shaft into reciprocating motion of the slide member 7 due to sliding friction caused by the screw engagement, and the capacity of the motor 3 must be increased.

Also, by rotating the motor 3 in the forward and reverse directions, the slide member 7
There was a problem that the operation was slow due to the round trip.

Another known fastener is shown in FIG. The fastener has short eccentric shafts 14, 14 protruding from both sides of a spur gear 13 that rotates around a shaft 12, and a crank 15 is rotatably fitted onto the eccentric shaft.
The crank 15 is connected to the slide member 7, and the drive gear 1 is continuously hit by the motor 3 via the reduction gear 4.
7 is meshed with the spur gear 13.

The rotation of the spur gear 13 causes the crank 6 to swing and the slide member 7 to reciprocate.

In the case of the fastener shown in FIG. 6, the axis Y passing through the drive gear 17, reduction gear 4 and motor 3 is orthogonal to the axis X along which the slide member 7 reciprocates, so the motor 3 and reduction gear 4 are housed A grip 11 must be provided at the rear end of the case 1.
When holding the fastener, the weight is unbalanced and difficult to handle.

(Means for Solving the Problems) The present invention involves rotating a tilted crankshaft 51 to swing a crank 6 on the crankshaft, and the movement of the crank 6 causes a slide member 7 to reciprocate. By doing so, the efficiency of power transmission is improved,
It also reveals a rivet fastener that has good weight balance and is easy to handle.

The rivet fastener of the present invention continuously drives the motor 3 through the speed reducer 4 to an inclined crankshaft 51 having an inclined shaft portion 53 at the center of the rotating shaft 52 which is inclined with respect to the axis of the rotating shaft 52. A crank 6 is rotatably fitted to the inclined shaft portion 53 of the inclined crankshaft 51 via a radial bearing 56 and a thrust bearing 57, and the free end 61 of the crank 6 is repeatedly struck by the slide member 7.

The motor 3, the rotating shaft 52 of the inclined crankshaft 51, and the slide member 7 are arranged on parallel axes, and an operating grip 11 is provided protruding outward from the vicinity of the center of gravity of the fastener.

(Operation and Effect) When the inclined crankshaft 51 is rotated by the motor 3, the inclined shaft portion 53 of the crankshaft swings around while swinging. Since the free end of the crank 6 fitted into the inclined shaft portion 53 in a freely rotatable manner engages the slide member 7, the rotation of the inclined crank shaft 51 causes the slide member 7 to reciprocate.

If the shaft body 94 of the rivet 9 is clamped by the clamping device 8 on the slide member 7, the shaft body 94 will be pulled when the slide member 7 retreats, and the cylindrical body 91 of the rivet 9 will be tightened as described above. It is compressed, expands outward, deforms, and finally breaks the shaft body 94 so that it can be tightened.

A radial bearing 56 and a thrust bearing 57 are provided between the inclined crankshaft 51 and the crank 6.
, the rotational frictional resistance between the crank and the crankshaft 51 can be reduced and power transmission efficiency can be improved.

Further, the motor 3 and the rotating shaft 5 of the inclined crankshaft 51
2 and the slide member 7 can be arranged on parallel axes, the fastener can be formed compactly, and since the operating grip 11 is provided protruding outward from the vicinity of the center of gravity, when the grip 11 is grasped, Good weight balance and easy to use.

(Example) The rivet 9 fastener of the present invention has a guide tube 2 removably attached to the front surface of a cylindrical case 1 as shown in FIG. 1, and the front surface of the case 1 is slidable inside the guide tube. The slide member 7 is inserted through it.

A motor 3 is located at the rear of the case 1, a multi-stage gear reduction device 4 is connected to the motor 3 at the center, and a slide member 7 is moved back and forth by converting the deceleration rotation of the reduction device 4 into reciprocating motion at the front. A slide member reciprocating device 5 for moving the slide member 7 is arranged in the same direction as the slide member 7.

An operation grip 11 is protruded from the outer peripheral surface of the case 1 close to the center of gravity of the fastener.

The motor 3 is connected to a switch 12 provided on the grip 11.
An inclined crankshaft 51 which is activated every time the pull is made and will be described later.
Rotate.

The slide member reciprocating device 5 includes an inclined crankshaft 5
The inclined crankshaft 51 is constructed by fitting the crank 6 into the case 1, and the inclined crankshaft 51 has a rotating shaft 52 rotatably supported in the case 1, and an inclined shaft portion 53 inclined with respect to the axis formed at the center of the rotating shaft 52. A crank 6 is fitted into the shaft portion for free rotation.

The free end of the crank 6 is shaped like a drum and fits into a hole 72 of a slide member 7, which will be described later.

The final gear 41 of the gear reduction device 4 is fixed to the rear end of the rotating shaft 52 of the inclined crankshaft 51 with a key.

A flange 54 is integrally protruded from the front end of the inclined shaft portion 53, and a collar 55 having a larger diameter than the inclined shaft portion 51 is fitted onto the rear end of the rotating shaft portion 52 against the end face of the shaft portion 51 and fixed with a key. ing.

Outer surfaces 54a, 5 of the flange 54 and collar 55
5a is a surface perpendicular to the rotating shaft 52, and inner surface 54b, 5
5b is formed on a surface perpendicular to the inclined shaft portion 53.

A radial bearing 56 is interposed between the inclined shaft portion 53 and the crank 6, and a thrust bearing 57 is interposed between the flange 54 and the crank 6.

The rotating shaft 52 is arranged parallel to the slide member 7, and both ends are supported by the case 1 via bearings 58 and 59. The front bearing 58 is a radial/thrust type that can receive both radial load and thrust load. It's a bearing.

The slide member 7 driven by the reciprocating device 5 is formed by connecting a slide body 71 that slides inside the case 1 and a slide shaft 75 that slides inside the guide cylinder 2, and the slide body 71 is attached to the bottom surface. A hole 72 into which the free end 61 of the crank 6 is fitted is provided, and a shaft 7 is provided on the front surface of the shaft 7 that penetrates the case 1 and enters the guide tube 2.
3 is provided protrudingly, and a threaded shaft 74 formed at the tip of the shaft is screwed into the rear end of the slide shaft 75.

The slide shaft 75 has a shaft body 94 with a rivet 9 at the tip.
It is equipped with a clamping device 8 for gripping.

The clamping device 8 is a well-known device, in which a cylindrical collet 81 having a hole that expands in a tapered shape at the back is attached to the tip of a slide shaft 75, and a plurality of jaws 82 are mounted inside the collet 81, and the jaws 82 are attached to a spring 84.
It is constructed by disposing a pressing cylinder 83 that presses forward with a force of .

The outer surface of each jaw 82 is formed into a tapered surface corresponding to the tapered hole surface of the collet 81.
By pulling backward, each jaw 82 approaches the axis of the collet 81.

Therefore, the shaft body 9 of the rivet 9 is inserted between the jaws 82.
4 and retreat the slide member 7, the shaft body 94 can be pulled rearward.

The slide shaft 75 is provided with a discharge portion 77 that communicates with a shaft hole 76 in which the press cylinder 83 is slidably fitted and opens at the lower center of the shaft.

The guide cylinder 2 that slidably guides the slide shaft 75 has a hole 21 in the center of its tip into which the shaft body 94 of the rivet 9 is fitted, and a hole 21 in the axial direction on the lower surface corresponding to the discharge part of the slide part. A drain hole 22 is provided in the drain hole 22 .

A screw 78 screwed onto the slide shaft 75 is slidably fitted into the discharge groove hole 22.
It plays the role of stopping the rotation.

Further, a hole 23 is provided at the top of the tip of the guide tube 2 for discharging broken debris.

However, when the grip 11 is grasped and the switch 12 is turned on, the inclined crankshaft 5 is
1 rotates.

The inclined shaft portion 53 of the inclined crankshaft 51 swings around while swinging. Since the free end 61 of the crank 6 shaft fitted into the inclined shaft portion 53 engages with the hole 72 of the slide body 71, it performs a movement to move the slide body 71 back and forth.

The reciprocating motion of the slide body 71 is transmitted to the clamp device 8 via the slide shaft 75, and as described above,
It is possible to tighten and break the rivet 9.

The broken shaft 94 remains supported by the jaw 82, but by pushing the broken shaft with the shaft of the next rivet, the broken shaft 94 slides through the pressing cylinder 83 of the clamp device 8. It is discharged to the outside from the discharge portion 77 of the shaft 75 and the discharge slot 22 of the guide tube 2 .

A radial bearing 56 and a thrust bearing 57 are provided between the inclined crankshaft 51 and the crank 6.
is interposed therebetween, and unlike the conventional example shown in FIG. 5, there is no place where sliding friction occurs due to screw engagement, and frictional resistance can be reduced to improve power transmission efficiency.

Furthermore, compared to the conventional example in which the spur gear is provided with an eccentric shaft as shown in FIG. 6, the motor 3, the rotating shaft 52 of the tilting crank 6, and the slide member 7 can be arranged on parallel axes, so the fastener can be made more compact. Therefore, the operating grip 11 is moved outward from the vicinity of the center of gravity.
Since the grip 11 is protruded, the weight balance is good when grip 11 is held, and an easy-to-use rivet fastener that combines the good points of the two conventional examples can be constructed. .

The present invention is not limited to the configuration of the above embodiments, and various modifications can be made within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the rivet tightener, Figure 2 is a sectional view taken along the line - Figure 1, and Figures 3A, 3B, 3C, and 3D are sectional views of the rivet tightener. Explanatory diagram showing the order, Figure 4 is a front view of the rivet, Figure 5 is a front view of the rivet.
6 are explanatory diagrams of a conventional fastener. 2... Guide tube, 51... Inclined crankshaft, 5
2... Inclined shaft portion, 6... Crank, 7... Slide member, 8... Crank device.

Claims (1)

[Claims] 1 Clamp device 8 that grips the shaft body 94 of the rivet 9
In a rivet tightening tool that repeatedly strikes the sliding member 7 that reciprocates in a straight line and tightens the rivet 9 by pulling the shaft body 94, the rotating shaft 5 is attached to the center of the rotating shaft 52.
The motor 3 is connected to an inclined crankshaft 51 having an inclined shaft portion 53 inclined with respect to the axis of the motor 3 via a reduction gear device 4.
The crank 6 is rotatably fitted to the inclined shaft portion 53 of the inclined crankshaft 51 via the radial bearing 56 and the thrust bearing 57, and the free end 61 of the crank 6 is repeatedly struck to the slide member 7, and the motor 3. Rotation shaft 52 of inclined crankshaft 51
and the slide member 7 are arranged on parallel axes, and an operating grip 11 is provided protruding outward from the vicinity of the center of gravity of the fastener.