JPS5932730Y2 - coupling device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coupling device that improves the durability of the arm and fixes the arm to the rotating shaft without causing slippage.

Conventionally, the connection device between the rotating shaft and the arm fixed to the rotating shaft is
As shown in Figure 1 a and bl, the thick arm 1
A hole 2 for mounting a connecting pin (not shown) is formed in the upper part of the
At the center of rotation of the arm 1, a through hole 4 provided with a spline 3 for preventing rotation is formed, and a gap 5 is formed passing through the lower end surface of the arm 1 from the through hole 4. ,
A fixing through hole 6 is formed on the lower side surface of the through hole 4, a protrusion 9 corresponding to the spline 3I is formed at the tip of the rotating shaft 7, and the tip 8 of the rotating shaft 7 is formed in the through hole 4. The bolt 10 is inserted through the fixing hole 61 from one side through the first locking washer 11, and then tightened through the nut 131 through the second locking washer 12 from the other side. The arm 1 is fixed to the rotating shaft 7 by reducing the width of the arm 1.

The 18th and second lock washers 11 and 12 each have one end bent in front of the arm 1, and the other end bent in the side of the bolt 10 and nut 13. It is preventing rotation.

Furthermore, as shown in FIGS. 2a and 2b, the lower part of the arm 14 with a small plate thickness is bent into a U shape, and the upper part of the long arm 14' is provided with a mounting hole 15 for a connecting pin (not shown). Transparent, long arm 14'
8 and short arm 14", through holes 17 and 1 formed with splines 16 and 1" for rotation prevention.
7' is transparent, a gap 18 is formed which communicates with the lower end surface of the arm 14 from the through holes 178 and 17', and the tip 8 of the rotating shaft 7 is inserted into the through holes 17 and 1? 'l Insert bolt 10
is inserted through the bent part l of the arm 14, and the l nut 13g is tightened as described above, the width of the gap 18 is shortened and fixed, and the first and second locking washers 11 and 12 are bent. .

In addition, the shape of the tip 8 of the rotating shaft 7 shown in FIGS. 1a and bfj and FIGS. There is also a method of forming the arms 1 and 14 to prevent rotation of the arms 1 and 14.

However, due to bolt 10 and nut 13, arms 1 and 14
Since the gaps 5 and 18 are narrowed and fixed, stress due to the tightening of the bolt 10 remains in the lower part of the arms 1 @ 3 and 14,
There is a disadvantage that the arms 1 and 14 are permanently deformed and cannot be reused.

Since the tightening force to the rotating shaft T varies depending on the strength of the arms 1 and 14, the degree of fixation of the arms 1 and 14 is not constant.

Also, the arms 1 and 14 rotate together with the rotating shaft 7 due to the splines 3 and 16, 16' for preventing rotation of the arms 1 and 14, and the bolt 10° nut 13. 14 may be shifted by one degree from the left or right, and there is a risk that the arms 1Z and 14 may fall off from the tip 8 of the rotating shaft 7.

This invention has been made with the above points in mind, and will now be explained in detail with reference to the drawings from FIG. 3 onwards showing an embodiment of the invention.

In these drawings, 19 is a freely rotatable rotation axis, 2
0 is the outer peripheral surface of the tip 1 of the rotating shaft 19 (rotation prevention part such as a spline or square shaft formed with a projection 21 for preventing rotation), 2
21-1 A tapped hole formed from the end face of the rotation prevention portion 20 of the rotating shaft 19, 23 is an arm whose lower part is bent into a U shape and consists of a long arm 24 and a short arm 25, 26 is a long arm A hole for mounting a connecting pin (not shown) formed at the tip of 24, 2
7 is a through hole formed at the rotation center position I of the long arm 24 into which the rotation prevention part 20 is inserted, 28 is a through hole for a bolt formed at the rotation center position 1 of the short arm 25, and 29 is a rotation center of the arm 23. It is a bolt that is fixed to the shaft 19, and the tapped hole 2 of the rotating arm 19
2 is screwed together.

30 is a bolt 29 in which a through hole 31 for bolt insertion is formed.
The lock washer 32 is a spring washer into which the bolt 29I is inserted.

Then, the rotation prevention portion 20 of the rotating shaft 19 is attached to the long arm 2 of the arm 23.
When the through hole 27 of No. 4 is inserted, the end surface is inserted into the short arm 25.
Insert the bolt 29 through the spring washer 32, the bolt insertion hole 31 of the locking washer 30, and the bolt through hole 281 of the short arm 25, and then screw them into the tapped hole 221 and tighten. Then, one end of the locking washer 30 is bent to the side of the short arm 25 and the other end is bent to the side of the bolt 29 to prevent the bolt 29 from turning.

Therefore, the arm 23 is less likely to be permanently deformed by tightening the bolt 29, and addition and removal are very easy, and the arm 23 can be reused without any problems.

Furthermore, by tightening the bolt 29, stress in the operating direction of the arm 231 is unlikely to remain, and the strength of the arm 23 does not change, and the rotating shaft 191 can be fixed with a constant strength. .

Furthermore, since the end surface of the rotating shaft 19 is in pressure contact with the short arm 251, the arm 23 will not shift left or right along the rotating shaft 19.

Further, the bolt 29 and the rotation prevention portion 20 of the rotating shaft 19 are
It is possible to shorten the length, and only one anti-rotation washer 30 is required, and materials can be reduced.

As described above, according to the coupling device of this invention, in addition to the coupling device between the rotating shaft and the arm to which the rotating shaft is fixed, a rotation preventing portion is formed at the tip of the rotating shaft. Form a tapped hole in the center of the shaft, form a U-shaped arm,
On one side of the arm, a hole for adding a connecting pin is formed, and on the other side, a through hole is formed into which the rotation prevention part is inserted, and on the other side of the arm, a through hole for a bolt is formed, and a through hole in the arm is formed. By inserting the end of the rotating shaft into the soil and tightening the bolt through one tapped hole through the bolt hole, the durability of the arm is improved and the rotating shaft is prevented from slipping. The arm can be fixed.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 11 respectively show conventional coupling devices, in which a is a front view, b in both figures is a side view, and Figs. 3 is a perspective view, FIG. 4 aB and bt-a are a front view and a side view, respectively, and FIG. 5 is an exploded perspective view. 19...Rotation shaft, 20...Rotation prevention part, 22...Tapped hole, 23...Arm, 2
6...Hole for connecting pin seat, 27...Through hole, 28...Through hole for bolt, 29...
·bolt.

Claims (1)

[Scope of utility model registration request] At the tip of the rotating shaft, a rotation prevention part such as a spline or a square shaft is formed, and at the tip of the rotating shaft, a tapped hole is formed at the center of the shaft, and one piece of the U-shaped arm is connected. In addition to forming a hole for attaching a pin, a through hole into which the rotation prevention part I is inserted is also formed, a through hole for a bolt is formed in the other piece of the arm, and a through hole for the rotation shaft is formed in the through hole of the arm. A coupling device in which the tip is inserted and a bolt is tightened through the bolt hole through the tapped hole I, thereby fixing the rotating shaft to the arm.