JPH04118980U - tightening tool - Google Patents

Abstract

(57) [Summary] [Purpose] To enable tightening of a threaded body such as a bolt with an impact wrench while the torque wrench remains attached to the threaded body. [Structure] A connecting body 4 is rotatably provided in a hollow end portion 2a of a head 2. A wrench portion 9 that engages with a bolt is formed at the lower end of the connecting body 4, and an engagement recess 10 into which the rotating shaft 12 of the impact wrench 11 is fitted is formed at the upper end of the connecting body 4. The connecting body 4 is a ratchet mechanism 8
This makes it possible to freely rotate in the bolt tightening direction R, and relatively unrotatable in the opposite bolt tightening direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a tightening tool with adjustable tightening torque.

0002

[Conventional technology]

Conventionally, the cylinder head was secured to the engine's cylinder block by tightening bolts. An impact wrench that uses air pressure is used to increase the efficiency of tightening work such as has been done. When assembling engines, etc., bolts must be tightened to the specified torque. Therefore, check whether the bolt in question has been tightened to the specified torque. A torque wrench is used to

0003 In such a torque wrench, spring force is used to oppose tightening torque through a toggle mechanism. to experience the displacement of the toggle mechanism when the tightening torque exceeds the spring force. This allows you to know that the tightening torque is higher than the specified torque. . The air pressure used in the impact wrench is set to the specified torque to avoid over-tightening. The bolts are set to the specified torque using a torque wrench. is tightened until it reaches .

0004

[Problem that the idea aims to solve]

However, the conventional torque wrench mentioned above requires a separate process from the impact wrench. It is a tool that allows you to re-engage the torque wrench with the bolt after using the impact wrench. It is necessary to do so. Therefore, not only is it troublesome to change tools, but It also causes time loss. Also, due to operator carelessness, tightening with a torque wrench may not be possible. Sometimes people forget to check the torque, resulting in insufficient tightening strength and poor sealing performance. Occurrence of this may also occur.

[0005] The purpose of this invention is to use an impact wrench when tightening screw bodies such as bolts and nuts. The screw body can be tightened to the specified torque without the need to change from a torque wrench to a torque wrench. The object of the present invention is to provide a tightening tool that can be tightened with a single screwdriver.

[0006]

[Means to solve the problem]

In order to solve the above problems, the present invention has developed a tightening torque for screw bodies such as bolts and nuts. Rotate the connecting body relative to the main body of the torque wrench in the tightening direction to adjust the torque. The connecting body is provided with an engine on its axis of rotation. The rotary action shaft of the impact wrench is connected in a relatively non-rotatable manner, and the threaded body engaging part is By providing this, a tightening tool was constructed.

[0007]

[Effect]

Operate the impact wrench with the bolt engaged in the threaded engagement part of the connection body. Then, the connecting body is rotated in the tightening direction of the screw body, and the screw body is tightened. screw body Rotate the torque wrench body in the direction of tightening the screw body while keeping the coupling body engaged with the , the connecting body rotates integrally with the torque wrench body, and the tightening torque by the torque wrench is applied. Adjustments are made.

[0008] In this way, the impact wrench and torque wrench are integrated via the connecting body. This allows you to tighten screws to the specified torque without having to change tools. The body is tightened.

[0009]

【Example】

An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3. As shown in FIGS. 1 and 2, a head 2 is attached to the tip of the tube 1 with a head pin. It is housed so that it can swing around 3. Head protruding forward of tube 1 A cylindrical connecting body 4 is rotatably supported at the hollow end portion 2a at the front end of the cylinder. Linking A gear 5 is integrally formed on the circumferential surface of the body 4, and a head saw 6 is installed in the hollow end 2a. and a ratchet spring 7 are housed therein. Gear 5, head saw 6 and rachi The ratchet spring 7 constitutes a ratchet mechanism 8, and controls the operation of the ratchet mechanism 8. Depending on the use, the connecting body 4 can be rotated relative to the head 2 in the direction R of the arrow in FIG. Relative rotation in the direction L marked is not possible.

0010 As shown in FIGS. 1 and 3, a wrench portion 9 is formed at the lower end of the connecting body 4. An engagement recess 10 is formed at the upper end of the body 4 . Wrench portion 9 and engagement recess 1 0 is set on the rotation axis Q of the connecting body 4 in both cases. Wrench part 9 has a hexagonal hole A bolt (not shown) is engaged, and the impact wrench 11 is inserted into the engagement recess 10. The rotation shaft 12 is inserted.

[0011] A groove 4a is formed on the upper outer periphery of the connecting body 4, and a stop pin 13 is inserted from the groove 4a into the connecting body. 4 and the rotation shaft 12 . A snap ring 15 is attached to the groove 4a. This prevents the retaining pin 13 from coming off. Therefore, the connection body 4 and rotation It is rotated integrally with the operating shaft 12. Torque adjustment mechanism at the upper end of impact wrench 11 26 is connected to an air supply tube 27 from an air supply source (not shown). , by controlling the amount of air supplied by the torque adjustment mechanism 26. The rotation torque of the rotation shaft 12 can be adjusted.

0012 As shown in FIG. 2, a seat 16 is provided inside the tube 1 so as to be slidable back and forth. A base end portion of a thruster 17 is fixed to the sheet 16 . Tip of thruster 17 One end of the toggle 19 is rotatably attached to the head 2, and the other end of the toggle 19 is attached to the rear of the head 2. It is rotatably attached to the end portion 2b. Thruster 17, toggle 19 and head 2 The link slider mechanism is configured by: In addition, near the tip of the thruster 17 A roller 18 is mounted so as to be able to roll on the inner surface of the tube 1. 8 guides the forward and backward movement of the thruster 17.

[0013] A thrust ring 20 is immovably provided at the rear end of the tube 1. An adjustment screw 21 is rotatably and slidably attached to the ring 20. A ring-shaped scale piece 22 is screwed onto the adjustment screw 21 so that it cannot rotate relative to the tube 1. The scale piece 22 moves inside the tube 1 based on the rotation of the adjusting screw 21. Moved back and forth. A scale plate 24 is fixed to the circumferential surface of the scale piece 22, and the scale plate 24 is fixed to the circumference of the scale piece 22. The scale plate 24 can be viewed through a window 25 provided in the grip portion 1a.

[0014] A main spring 23 is interposed between the scale piece 22 and the seat 16. Spring 23 urges seat 16 and thruster 17 toward head 2 . subordinate Therefore, the operator reads the scale on the scale plate 24 through the window 25 while reading the scale inside the tube 1. The main spring 23 is biased by adjusting the position of the scale piece 22 in the The force can be set to a desired value.

[0015] Now, when tightening the hexagonal socket bolt, first follow the specifications for this bolt. Adjust the torque on the impact wrench 11 according to the tightening torque, but the In order to avoid over-applying, the torque is set weaker than the specified value. And six Engage the wrench part 9 of the connecting body 4 with the bolt with a square hole to create the impact wrench 11. When the bolt is moved, the connecting body 4 is rotated together with the rotating shaft 12 in the direction of the arrow R. is tightened.

[0016] After tightening with impact wrench 11, insert the wrench into the hexagonal hole of the hexagonal socket bolt. Rotate the torque wrench in the tightening direction R while keeping the part 9 fitted. tube 1, the tightening torque of the bolt is applied to the ratchet mechanism 8. acts as a reaction force on the head 2 through the head pin 3, and rotates the head 2 around the head pin 3. An attempt is made to make a relative rotation in the direction opposite to the operating direction. Relative rotational force of head 2 in the opposite direction is connected to the main spring 23 via the toggle 19, thruster 17 and seat 16. However, unless the force exceeds the biasing force of the main spring 23, the thruster 17 and sheet 16 are not pushed back.

[0017] Therefore, the head 2 unbiases the thruster 17 and the sheet 16 via the toggle 19. A state in which the force pushing back in the direction and the biasing force of the main spring 23 are balanced. In this case, the head 2 does not rotate around the head pin 3, and the head 2 does not rotate around the head pin 3. It is integrated into the block 1. In this integrated state, the connecting body 4 cannot rotate relative to the head 2. Therefore, the connecting body 4 is also rotated in the tightening direction R together with the tube 1.

[0018] As the connecting body 4 rotates, the bolts are tightened more strongly. bolt tightening The reaction is carried out through the coupling body 4, the ratchet mechanism 8, the head 2 and the toggle 19. The signal is transmitted to the star 17 and the seat 16. Then, the tightening torque of the bolt is The maximum value of the biasing force of the main spring 23 determined based on the operation of the spring 21 (immediately When the set torque is reached, the thruster 17 and seat 16 are activated by the main spring. The head 2 moves backward inside the tube 1 against the elasticity of the head 2, and the rear end 2b of the head 2 moves toward the thruster 1. 7.

[0019] The user of the torque wrench is responsible for the head pivot caused by the retreat of the thruster 17 and seat 16. minute relative rotation of tube 1 with respect to head 2 around tube 3, and movement of head 2. Feel the change in response caused by the contact between the rear end 2b and the thruster 17, and press the button. Detects when the tightening torque of the bolt reaches the set torque. In this way, according to this embodiment, the torque wrench and the impact lever are connected via the connecting body 4. By integrating with the impact wrench 11, bolt tightening with the impact wrench 11 is possible. Both fitting and tightening torque adjustment using a torque wrench can be performed. subordinate So, after using the impact wrench 11 like before, change to the torque wrench. There is no need to tighten bolts, eliminating the hassle and time loss of replacing bolts. can be done efficiently.

[0020] Also, following the tightening of the bolt with the impact wrench 11, a torque wrench is used. The tightening torque can be adjusted using the tool, so there is no need to change tools like before. This reduces the risk of forgetting to check the tightening torque due to negligence, contributing to improved product quality. can do. Note that the present invention is not limited to the above embodiments, but can be implemented in the following manner. You may. That is, (1) The screw engagement portion of the connecting body 4 is a hexagonal box. (2) Torque wrench equipped with automatic setting torque detection circuit including limit switch etc. be used.

[0021]

[Effect of the idea]

As detailed above, according to the present invention, the tightening torque of threaded bodies such as bolts and nuts is The connecting body can be rotated relative to the main body of the torque wrench in the tightening direction to adjust The connecting body is provided with an inlet on its axis of rotation. In addition to connecting the rotation axis of the compact wrench so that it cannot rotate relatively, a screw body engagement part is also provided. Because of this, I replaced the impact wrench with a torque wrench when tightening the screw body. The torque wrench can be attached to the screw body without any additional work. It has the excellent effect of being able to tighten to the specified torque.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment embodying the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view showing an enlarged main part of FIG. 1;

[Explanation of symbols]

1 Tube constituting the torque wrench body, 2 Head constituting the torque wrench body, 4 Connecting body, 9 Wrench part as screw body engagement part, 11 Impact wrench, 1
2 Rotation action axis, R tightening direction, L anti-tightening direction, Q
axis of rotation.

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Michio Shimizu 2-1 Toyotacho, Kariya City, Aichi Prefecture Co., Ltd. Inside Toyoda Automatic Loom Works

Claims (1)

[Scope of utility model registration request] [Claim 1] A connecting body is rotatable relative to the main body of a torque wrench for adjusting the tightening torque of threaded bodies such as bolts and nuts in the tightening direction, and is not relatively rotatable in the counter-tightening direction. A rotating shaft of the impact wrench is connected to the connecting body on the rotational axis of the connecting body in a relatively non-rotatable manner, and
A tightening tool with a screw body engagement part.