JPH08290367A - Tightening tool - Google Patents

Abstract

PURPOSE: To facilitate the temporary and permanent tightening works of a bolt, etc. CONSTITUTION: A tightening tool is provided with a tightening mechanism capable of tightening a body to be tightened such as a bolt 10, etc., to either right or left direction and incapable of tightening the body in other direction, and an alarming mechanism 3 to inform that the tightening force by the tightening mechanism reaches the prescribed value. When the bolt 10 is tightened to the prescribed direction by the tightening mechanism 2, it is informed that the bolt is tightened with the prescribed tightening torque by the torque alarming mechanism 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening tool for tightening bolts or nuts.

[0002]

2. Description of the Related Art Conventionally, bolts or the like have been used for fastening and fixing steel frame members to each other in a steel frame structure such as a steel tower supporting a power transmission line. The bolts are tightened by a tightening tool. As for the tightening work of the bolts used in the steel frame structure as described above, first, the ratchet wrench is used for temporary tightening work, and then the torque wrench is used for final tightening work to tighten to a predetermined torque. The bolts that have been fully tightened are marked with a marker so that they can be distinguished from the temporarily tightened bolts.

[0003]

However, since it is necessary to use two tightening tools, a ratchet wrench and a torque wrench, for tightening the bolt, it is necessary to properly use each tightening tool. Therefore, there is a problem that the tightening work is troublesome for the worker.

Further, in the case of marking a bolt that has been fully tightened, the torque wrench and the magic must be bothered to carry out the marking work after the final tightening work is completed. Therefore, there is a problem that the marking work is very troublesome. On the other hand, irrespective of the method of performing marking work every time the bolt is fully tightened, some workers may collectively tighten multiple bolts and then collectively mark the bolts. Can also be considered. However, in that case, a problem may occur in that a marking omission error may occur.

The present invention has been made to solve the above problems, and a first object thereof is to easily perform temporary tightening and final tightening work of a tightened body. Also, the second
The purpose of is to easily and surely mark an object to be tightened. Furthermore, the third object is to expand the versatility of the tightening tool.

[0006]

According to a first aspect of the present invention, a tightened body such as a bolt or a nut can be tightened in either one of the left direction and the right direction, and the other side. It is a gist to provide a tightening means that cannot be tightened in the direction of and a torque notifying means that notifies that the tightening force by the tightening means has reached a predetermined torque value.

The invention according to claim 2 is characterized in that the tightening means is provided with marking means for marking a mark on the object to be tightened. The invention according to claim 3 is characterized in that the marking means is detachably provided.

[0008]

According to the invention described in claim 1, when the tightening means tightens the object to be tightened in the predetermined direction, the torque notifying means informs that the tightening torque has been tightened to the predetermined tightening torque.

According to the invention described in claim 2, claim 1
In addition to the action of the invention described in (1), a mark is marked on the tightened body by the marking means. According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, when temporarily tightening the object to be tightened, the marking means is detached from the ratchet wrench mechanism portion to perform final tightening. Sometimes marking means are attached.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a tightening tool will be described below with reference to the drawings. As shown in FIG. 1, the tightening tool 1 is composed of a tightening mechanism 2 as a tightening means and a torque notifying mechanism 3 as a torque notifying means. First, the tightening mechanism 2 will be described. Cylindrical handle 4
A support 5 is swingably supported by a pin 6 at the tip of the. A groove 7 is formed at the tip of the support body 5, and a ratchet wheel 8 is supported at the tip of the groove 7 so as to be rotatable in the left-right direction. A cylindrical bolt engagement cylinder 9 is fixed to the ratchet wheel 8 so as to be integrally rotatable with the ratchet wheel 8, and a bolt 10 as a tightening means is attached to a lower portion of the bolt engagement cylinder 9 shown in FIG. Head 1
An engaging portion 9a that can be engaged with 0a is formed.

A detent piece 12 is disposed in the groove portion 7, and the detent piece 12 is swingably supported by a shaft 13. The detent piece 12 includes a pair of claw portions 12a, 1
2b is formed so as to project toward the ratchet wheel 8, and each claw portion 12 is formed.
The a and 12b are selectively engageable with the ratchet wheel 8. By engaging one of the claw portions 12a with the ratchet wheel 8, the handle 4 and the bolt engagement cylinder 9 are integrally rotatable in the direction of arrow A shown in FIG. 1 about the axis of the bolt 10. Only the handle 4 is rotatable in the B direction.
On the other hand, by engaging the other claw portion 12b with the ratchet wheel 8, the handle 4 and the bolt engagement cylinder 9 can be integrally rotated in the arrow B direction about the axis of the bolt 10 and in the arrow A direction. Only the handle 4 is rotatable.

A housing hole 14 is formed in the base end surface of the groove portion 7, and a holding projection 16 is slidably engaged with the housing hole 14 via a compression spring 15. A pair of locking recesses 17a and 17b are formed on the side surface of the detent piece 12 that is located opposite to the tip of the holding projection 16. The tip of the holding projection 16 can be locked in the locking recesses 17a and 17b by the biasing force of the compression spring 15.

Next, the torque notification mechanism 3 will be described. Protrusions 20a, 20 are provided on both sides of the base end of the support 5.
b is formed. And any one of the protrusions 20
When a and 20b hit the inner surface of the handle 4, it is notified that the tightening torque of the bolt 10 has reached a predetermined torque due to the impact force. One end of the first toggle link 22 is connected to the base end of the support 5 via a pin 21a, and the other end of the first toggle link 22 is connected to one end of an intermediate link 23 via a pin 21b. The other end of the intermediate link 23 is connected to one end of the second toggle link 24 via the pin 21c, and the other end of the second toggle link 24 is connected to one end of the thruster 25 via the pin 21d. The thruster 25 is supported on the inner wall surface of the handle 4 via the ball 19 and is movable along the axial direction of the handle 4.

An adjusting screw 26 is screwed onto the base end of the handle 4 so as to be able to move forward and backward. A compression spring 27 that urges the thruster 25 toward the tip of the handle 4 is interposed between the adjusting screw 26 and the thruster 25. One end of the compression spring 27 is locked to the thruster 25, and the other end is in contact with the inner end surface of the adjusting screw 26. Then, the compression spring 2 is adjusted by adjusting the screwing position of the adjusting screw 26.
The urging force of 7 can be adjusted.

As shown in FIG. 2, a stamp mechanism 28 as a marking means is provided in the bolt engagement cylinder 9. The stamp mechanism 28 is provided with a mounting cap 29, and the mounting cap 29 is detachably screwed to the upper end of the bolt engagement cylinder 9. An upper end of a spring support rod 30 having a bottomed cylindrical shape is screwed to the central portion of the mounting cap 29, and a screw lid 31 is detachably screwed to the upper end of the spring support rod 30. A support rod 32 is slidably passed through the spring support rod 30 along the axial direction of the bolt engagement cylinder 9. The head 32 a of the support rod 32 contacts the bottom surface of the spring support rod 30 so that the support rod 32 does not come out of the spring support rod 30.

At the lower end of the support rod 32, a stamp housing cylinder 33 having a cylindrical shape with a lid is detachably screwed. A stamp 34 made of sponge is provided in the stamp container 33.
Are interchangeably inserted. Red ink is infiltrated into the stamp 34, and the lower end surface of the stamp 34 can contact the head 10a of the bolt 10. A compression spring 35 externally fitted to the spring support rod 30 is provided between the mounting cap 29 and the stamp housing cylinder 33. The lower end of the compression spring 35 is supported on the upper surface of the stamp housing cylinder 33 and the upper end thereof is It is in contact with the inner top surface of the mounting cap 29.

Next, the tightening tool 1 configured as described above.
The action of tightening the bolt 10 will be described with reference to.
However, the tightening direction of the bolt 10 is the direction of arrow A shown in FIG.

First, the case of temporarily tightening the bolt 10 will be described. In the case of temporary tightening, the mounting cap 29 is screwed back and the stamp mechanism 28 is removed from the bolt engagement cylinder 9. Further, the claw portion 12a of the detent piece 12 is attached to the claw wheel 8
Be engaged with. In this state, the engaging portion 9 of the bolt engaging cylinder 9
When a is inserted into and engaged with the head portion 10a of the bolt 10 and the handle 4 is rotated in the direction of arrow A shown in FIG. 1, the claw portion 12a of the detent piece 12 and the claw wheel 8 are engaged with each other, so that the bolt is engaged. The cylinder 9 is rotated in the arrow A direction shown in FIG. This bolt engagement cylinder 9
The rotation of the bolt tightens the bolt 10.

When the handle 4 is rotated by a predetermined amount and the handle 4 is rotated in the direction of the arrow B shown in FIG. 1 without removing the bolt engagement cylinder 9 from the bolt 10, the claw portion 12a of the detent piece 12 is removed. Since it is moved along the outer periphery of the ratchet wheel 8, only the handle 4 is rotated without rotating the bolt engagement cylinder 9. Therefore, the bolt 10 is tightened only when the handle 4 is rotated in the arrow A direction. The above operation is repeated to temporarily tighten the bolt 10.

After the temporary tightening of the bolt 10 is completed, the bolt engaging cylinder 9 is removed from the head 10a of the bolt 10. Then, the mounting cap 29 is screwed onto the engagement cylinder 9, and the stamp mechanism 28 is attached to the bolt engagement cylinder 9. When the engaging portion 9a of the bolt engaging cylinder 9 is inserted into and engaged with the head portion 10a of the bolt 10 in this state, the lower surface of the stamp 34 becomes the head portion 1 of the bolt 10.
0a, and the stamp housing cylinder 33 presses the compression spring 3
It is moved upward against the biasing force of 5. Then, the head 10a of the bolt 10 is marked with a red final fastening end mark.

Then, similarly to the case of temporary tightening, the handle 4 is reciprocally rotated in the directions of the arrow A and the arrow B, and the bolt 10 is rotated.
When the tightening torque of 1 reaches near the predetermined tightening torque, the support 5 is rotated around the pin 6 in the direction of arrow B. With the rotation of the support body 5, the second toggle link 24 is rotated around the pin 21c, the thruster 25 is moved to the proximal end side of the handle 4, and the compression spring 27 is pressed. And bolt 10
When the tightening torque of No. 2 reaches a predetermined tightening torque, the projecting portion 20a of the support 5 hits the inner wall surface of the handle 4 as shown in FIG. 3, and the predetermined tightening torque value is reached by the impact at that time. Is transmitted.

When the tightening direction of the bolt 10 is opposite to that described above, the detent piece 12 is rotated to engage the claw portion 12b of the detent piece 12 with the ratchet wheel 8. To do. Then, the holding projection 16 is engaged in the locking recess 17a against the biasing force of the compression spring 15, and the tip of the holding projection 16 is pressed against the locking recess 17a by the biasing force of the compression spring 15, so that the pawl is pressed. The portion 12b is engaged with and held by the ratchet wheel 8. When the handle 4 is reciprocally rotated, the bolt engagement cylinder 9 is moved to the handle 4 only when the handle 4 is rotated in the arrow B direction shown in FIG.
And the bolt 10 is tightened.

When the bolt 10 is to be fully tightened, after the stamp mechanism 28 is attached to the bolt engagement cylinder 9,
When the handle 4 is reciprocally rotated and the tightening torque of the bolt 10 reaches the vicinity of a predetermined tightening torque, the support body 5 moves in the arrow A direction with the pin 6 as the center, contrary to the case where the bolt 10 is tightened in the arrow A direction. Is turned to. When the tightening torque of the bolt 10 reaches a predetermined tightening torque, the projecting portion 20b of the support body 5 contacts the inner wall surface of the handle 4 as shown in FIG. 4, and the shock at that time causes a predetermined tightening torque value. Is reached.

As described above, in the tightening tool 1, the bolt 10 is temporarily tightened by the tightening mechanism 2 and is finally tightened to the predetermined tightening torque by the torque notifying mechanism 3. There is no need to change hands. As a result, the temporary tightening and the final tightening work of the bolt 10 can be easily performed.

Further, since the stamping mechanism 28 is provided in the tightening mechanism 2, the head 10a of the bolt 10 can be marked with the final tightening completion mark while tightening the bolt 10, so that the marking operation can be facilitated. . Moreover,
Since the stamp mechanism 28 is provided so as to be attachable to and detachable from the tightening mechanism 2, the head 10a of the bolt 10 is not marked with a final tightening completion mark when the bolt 10 is temporarily tightened, and is marked only when the final tightening is performed. can do. That is, whether or not to make marking can be left to the discretion of the user, and the versatility of the tightening tool 1 is increased.

Further, the stamp housing 33 is attached to the bolt 10
It is provided so as to be movable along the axial direction of (1) and can be pressed against the head portion 10a of the bolt 10 by the compression spring 35. Therefore, the head 10a of the bolt 10 can be easily marked with the final tightening completion mark. At the same time, since the final tightening completion mark is surely marked for each bolt 10 for which the final tightening of the bolt 10 has been completed, a marking error can be reliably prevented. Further, even if the height position of the head portion 10a of the bolt 10 with respect to the axial direction of the bolt engagement cylinder 9 is different, the position of the stamp housing cylinder 9 can be flexibly moved by the spring pressure of the compression spring 35.
A reliable and clear final tightening end mark can be marked.

The present invention can be configured as follows in addition to the above embodiment. (1) Although the bolt 10 is tightened by using the tightening tool 1 in the above embodiment, the tightening tool 1 for tightening a nut or the like may be embodied.

(2) In the above embodiment, the mounting cap 29 is detachably screwed to the bolt engaging cylinder 9, but in addition to this structure, the mounting cap 29 is fixed to the bolt engaging cylinder 9. You may With this configuration,
The head end 10a of the bolt 10 can be easily and reliably marked with the tightening end mark.

(3) The tightening tool 1 of the above embodiment is not limited to steel frame members used in steel towers and steel structures, but can be applied as the tightening tool 1 for tightening bolts 10 and nuts in all industrial fields. Is.

Next, technical ideas other than the claims that can be understood from the above-mentioned embodiment will be described together with their effects. (A) The marking means 28 includes a stamp housing means 33 for housing a stamp 34, and the stamp housing means 33.
The tightening tool according to claim 2 or 3, wherein the tightening tool is provided so as to be movable in a direction of contacting the object to be tightened 10. According to this structure, even if the height position of the to-be-fastened body 10 differs, a mark can be reliably attached to the to-be-fastened body 10.

(B) The tightening tool according to (A), further including an urging member 35 for urging the stamp accommodating means 33 in a direction in which the stamp accommodating means 33 comes into contact with the object to be tightened 10. According to this configuration, since the stamp 34 can be reliably pressed against the tightened body 10 by the biasing member 35, a clear mark can be attached.

[0032]

As described above in detail, according to the invention described in claim 1, it is possible to easily perform the temporary tightening and the final tightening work of the object to be tightened.

According to the invention of claim 2, claim 1
In addition to the effect of the invention described in (1), it is possible to easily and surely mark the object to be tightened, and it is possible to prevent erroneous marking of the object to be tightened.

According to the invention of claim 3, claim 2
In addition to the effect of the invention described in (3), the object to be tightened can be marked only when the object to be tightened is fully tightened, and the versatility of the tightening tool can be expanded.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a tightening tool showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a stamp mechanism.

FIG. 3 is a plan sectional view showing an operating state of the torque notification mechanism.

FIG. 4 is a plan sectional view showing an operating state of the torque notification mechanism.

[Explanation of symbols]

2 ... Tightening mechanism (tightening means), 3 ... Torque notifying mechanism (torque notifying means), 10 ... Bolt (tightening object), 28 ... Stamping mechanism (marking means)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toheihei Nagaya 2-10-15 Usa, Gifu City, Gifu Eight Industrial Co., Ltd.

Claims (3)

[Claims] Claim: What is claimed is: 1. A tightening means capable of tightening a tightened body such as a bolt or a nut in any one of the left direction and the right direction, and not tightening in the other direction. A tightening tool comprising: torque notifying means for notifying that the tightening force by the tightening means has reached a predetermined torque value. 2. The tightening tool according to claim 1, wherein the tightening means is provided with marking means for marking a mark on the object to be tightened. 3. The tightening tool according to claim 2, wherein the marking means is detachably provided.