JPS5815096Y2 - Fixed angle fastening device in fastening tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed angle fastening device that tightens bolts, nuts, etc. once to an initial torque to a predetermined torque by further tightening them at a predetermined angle.

Conventionally, there is no such tightening device at all, and only a tightening tool that detects tightening torque is used, and the detection mechanism usually does not measure accurate torque. It was not possible to tighten at this torque value, and the tightening was completed at a torque value slightly lower than the set torque value.

In view of this point, the present invention enables tightening at a constant angle to accurately reach a predetermined torque, and will be described in detail below with reference to the accompanying drawings showing embodiments.

The constant angle fastening device of the present invention includes a rotation angle regulating means 1 provided at the tip of a fastening tool 17 capable of forward and reverse rotation, such as a Nandrana impact wrench, which is connected to an output shaft 16 of the fastening tool 1T to rotate the fastening tool 1T. The rotating force transmitting means 3 rotates only within a predetermined angle range determined by the angle regulating means 1, and the rotating force transmitting means 3 rotates integrally with the rotating force transmitting means 3 against a high load only during a fastening operation. Consisting of output means 7
・Ru.

In the embodiment shown in FIGS. 1 and 2, the rotation angle regulating means 1 is represented as a pair of claw bodies 2, 2'.

The rotational force transmitting means 3 engages with the claws 2 and 2' on the rear end surface of a cylinder 4 whose rear end is connected to the output shaft 16 of the fastening tool 1T with a pin 6 to prevent removal. The claw bodies 5, 5' to be obtained are provided protrudingly.

The output means 7 connects the rear end of a rotating shaft 8 rotatably supported by a fixed plate 15 via a bearing 14 to the cylindrical body 4 via a one-way clutch 9 that transmits rotational force only when rotating in one direction. At the same time as fitting, the rear end portion of the rotating shaft 8 is connected to an inward flange 4' provided on the cylinder body 4 via an O-ring 10.
-Furthermore, the rear end of the socket 11 is fitted to the tip of the rotating shaft 8 in such a manner that it can be slid in the axial direction by the pin 13 and cannot be pulled out, and the socket 11 is always secured by the spring 12. The socket 11 is urged forward.

Note that the fixing plate 15 is fastened to the tightening tool 1 by bolts etc.
It is integrally connected to the main body of L.

Reference numeral 19 denotes retaining rings 20, 2 for preventing the pin 6, which connects the cylindrical body 4 and the output shaft 16 in a retaining manner, from being withdrawn and falling.
1 is a bearing inserted between the cylindrical body 4 and the rotating shaft 8;
Reference numeral 22 designates a long hole for pin insertion provided in the side wall of the socket 11, and reference numeral 23 designates a retaining ring for preventing the pin 13 from falling out.

The operation of the constant angle fastening device configured as described above is as follows.

When the tip of the socket 11 is pressed into contact with the head of a bolt, NAND, etc. that has been tightened with a NAND runner, impact wrench, etc., the socket 11 will open.

It is slid backward against the elasticity of the spring 12.

In this state, when the tightening tool 17 is rotated in the opposite direction (that is, in the direction of loosening bolts, nuts, etc.), the cylindrical body 4
The one-way clutch 9 rotates integrally with the output shaft 16 of the fastening tool 11, but when rotating in the reverse direction, the one-way clutch 9 crosses over and does not transmit rotational force, and the friction between the O-ring 10 and the rotating shaft 8 The rotational force is transmitted to the rotating shaft 8 only by force, and the socket 1
1 rotates in reverse.

Since the heads of bolts, nands, etc. have regular hexagonal shapes, they always align with the holes of the socket 11 until the socket 11 is rotated 60 degrees in the opposite direction, and the heads of bolts, nands, etc. and the holes of the socket 11 are aligned. When they match, the socket 11 due to the elasticity of the spring 12
is slid forward, and the hole fits into the head of a bolt, nand, etc.

When the socket 11 is fitted into a bolt, a Nand, etc., the bolt, Nand, etc. are already tightened (・), so a large load is applied to the socket 11 and the rotating shaft 8, and therefore the cylinder body 4 is attached to the rotating shaft 8. The cylindrical body 4 is rotated in the opposite direction until the pawls 5 and 5' of the cylindrical body 4 abut and engage with the pawls 2 and 2' of the fastening tool 11.

That is, the bolts, nuts, etc. will not be loosened while the tightening tool 1γ is rotating in the opposite direction.

As described above, the tightening tool 17 is rotated in the opposite direction until the claw bodies 2, 2', 5, and 5' come into contact with each other, and then in the forward direction (direction for tightening bolts, nands, etc.) When the cylindrical body 4 is rotationally driven as shown in FIG. A bolt, a nut, etc. can be rotated and tightened by a predetermined angle determined by the spacing and size of the claws.

Above, an example in which the claw bodies are engaged with each other has been described, but other examples such as a combination of a protrusion and an arcuate groove, etc.
It can be replaced by any suitable means, and instead of inserting the rotating shaft into the cylinder, the rotating shaft may be made into a cylinder, and the output shaft may be inserted into the cylinder.

Further, it is possible to make other modifications that can achieve the same effect as the above embodiment.

The constant angle tightening device of the present invention as described above is an excellent device that has a practical effect in that once a bolt, a nut, etc. is tightened, it can be tightened to a predetermined torque value by accurately tightening it at a predetermined angle. It is.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional side view showing an embodiment of the present invention in a constant angle fastening state, and FIG. 2 is a sectional view taken along the line u--■ in FIG. 1...Rotation angle regulating means, 3...Rotational force transmission means, I...Output means.

Claims (1)

[Scope of utility model registration request] An output means that is automatically fitted when the head of a bolt, a nand, etc. and a hole into which it can be fitted are aligned, and an output shaft of a fastening tool that can be rotated in forward and reverse directions and the output means, a rotational force transmitting means that connects to transmit rotational force even when resisting a high load when rotating in one direction, and transmitting rotational force only when the load is low when rotating in the opposite direction; and a rotational force that limits the rotational range of the output shaft. A fixed angle fastening device in a fastening tool which is equipped with an angle regulating means.