JP2010196791A - Screw type lock mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recognize whether lock work is normally performed, by externally recognizing rotating and stroking to a lock position of a nut invisible from an external part. <P>SOLUTION: When rotating a bolt 12 in a fastening direction, the nut 13 is rotated together by 90°, and is held at an illustrated lock position by a stopper 11c. The nut 13 strokes toward a lock base 11 by a further rotation in the same direction of the bolt 12, and pinches a vehicle body side lock plate 3 between the nut 13 and the lock base 11, and can lock a battery on a vehicle body. A rod 21 for rotating and stroking together with the nut 13 is penetratingly arranged in the hollow hole of the bolt 12 so as to be capable of freely rotating and stroking, and the rotation and stroke of the nut 13 can be recognized from the external part based on the rotational position of a mark 21b in an expansion head 12a of the rod 21 and a projecting state of an expansion head 21a from a lower end surface of the bolt 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  According to the present invention, a certain member to which the bolt and the lock nut are attached can be detachably or permanently attached to another member by a clamping force generated by relative rotation of the bolt and the lock nut screwed to the bolt. The present invention relates to a screw-type locking mechanism of the type that is locked to the screw.

As the lock mechanism, a rotating cam mechanism that converts rotational operation force into axial force to generate a pinching pressure is used, and a member to which the rotating cam mechanism is attached by the pinching pressure generated by the rotating cam mechanism is used. In many cases, a cam-type lock mechanism that can be detachably attached to other members or permanently locked is used.
The reason is that the amount of rotational operation of the rotating cam mechanism is small and the attachment / detachment time can be shortened.

On the other hand, in an electric vehicle equipped with an electric motor such as an electric vehicle or a hybrid vehicle, a large-capacity large-sized battery is required for the electric motor, and such a large and heavy battery (for example, 60 to 70 kg) is mounted on the vehicle body. There is a requirement that it must be detachable or permanently locked.
When the above-described cam type locking mechanism is used to lock such a heavy battery to the vehicle body, not only is the locking certainty lacking, but the anxiety that the locking strength is insufficient cannot be eliminated.

Therefore, when locking a heavy object in this way, it is conceivable to use a screw type locking mechanism such as that described in Patent Document 1, for example.
This screw-type lock mechanism is detachable from a member to which a bolt and a lock nut are attached by means of clamping pressure generated by relative rotation of the bolt and a lock nut screwed to the bolt. Or something that locks permanently.

On the other hand, as the screw-type lock mechanism, the lock nut is fixed to the other member by welding or the like, and a bolt attached to the certain member is screwed into the fixed lock nut. A so-called nut-fixed type that locks to the other member,
A so-called nut screw is used in which a lock nut is always screwed to a bolt and is permanently installed on the certain member, and a certain member is locked to another member by a clamping force generated by relative rotation of the bolt and the lock nut in the tightening direction. It can be considered as a combination.

The former nut fixing type locking mechanism does not cause a problem when a certain member is permanently locked to another member, but when a certain member needs to be detachably locked to another member,
There is a need to screw the bolt into the lock nut every time it is attached and detached, which hinders the automation of the locking operation and creates a galling between the bolt and the lock nut when screwed together, possibly causing the lock mechanism itself to be destroyed. There is.

Therefore, when the screw type lock mechanism is used as the detachable lock mechanism, it is preferable to configure the latter nut screw type.
The screw type locking mechanism of the present invention is generally related to such a nut screw type locking mechanism,
The lock base is secured to the lock base, and a bolt is rotatably provided. A lock nut is screwed onto the end of the bolt opposite to the secured end, thereby limiting the rotation angle of the lock nut with respect to the lock base. Thus, a screw-type lock mechanism that generates a clamping pressure between the lock base and the lock nut by rotating the bolt in the tightening direction is a basic premise of the gist configuration.

  By the way, in the case of such a screw-type lock mechanism, the lock mechanism has a lock claw or the like that protrudes radially outward and it is difficult to set the seal part, and the lock mechanism is not exposed to the outside. Must be used.

For this reason, at the time of locking, the end of the bolt on the side far from the threaded end of the lock nut is rotated in the tightening direction by a nut runner or the like.
Initially, the lock nut is rotated along with the rotation of the bolt. However, since the rotation angle of the lock nut is limited, the lock nut remains in this limit position.
Therefore, thereafter, the lock nut is tightened by the rotation of the bolt and the stroke is made in the screwing direction.
Due to the stroke of the lock nut, a clamping pressure is generated between the lock base and the lock nut, and the certain member can be locked to another member.

Japanese Patent No. 3324182

However, in the above-mentioned screw type lock mechanism, the lock nut cannot be recognized from the outside during the locking operation, so the rotation of the lock nut to the limit position and the subsequent stroke of the lock nut in the screwing direction are also recognized. Can not do it.
For this reason, there is a possibility that it may be erroneously determined that the lock is completed as normal even when the normal lock state cannot be obtained due to foreign matter or the like during the lock operation.

Even if the present invention cannot recognize the lock nut directly from the outside for the above reason, it is possible to recognize the rotation of the lock nut to the limit position at least,
An object of the present invention is to propose a screw-type locking mechanism that can reliably detect a locking failure during a locking operation and can solve the above-described problems.

For this purpose, the screw type locking mechanism according to the present invention is configured as follows.
First of all, to explain the prerequisite screw type locking mechanism,
The lock base is secured to the lock base, and a bolt is rotatably provided. A lock nut is screwed onto the end of the bolt opposite to the secured end, thereby limiting the rotation angle of the lock nut with respect to the lock base. Thus, a locking clamping pressure is generated between the lock base and the lock nut by rotating the bolt in the tightening direction.

The present invention provides such a screw-type locking mechanism,
A rod that interlocks with the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction passes through the hollow hole of the bolt and is rotatably provided;
The end of the rod exposed from the end face of the bolt on the bolt end side that is prevented from coming off is provided with a rotation mark related to the rotational position of the lock nut.

According to the above-described screw type locking mechanism of the present invention, the rod that is rotatably provided through the hollow hole of the bolt is interlocked with the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction. Because the rotation mark attached to the end of can be recognized from the outside of the screw-type locking mechanism,
The rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction can be recognized from the position of the rotation mark at the rod end.

  For this reason, the rotation of the lock nut to the limit position can be recognized, and it can be determined that the lock by the lock nut can be completed as normal during the lock operation.

It is a principal part fracture perspective view seen from the lock nut side which shows the screw type lock mechanism which becomes one example of the present invention in the unlock position. FIG. 2 is a longitudinal side view of the screw-type locking mechanism in FIG. 1 taken along the line II-II and viewed in the direction of the arrow. FIG. 2 is a fragmentary perspective view of the threaded locking mechanism in FIG. 1 viewed from the lock nut side, showing the locking position. FIG. 4 is a longitudinal side view showing the screw type locking mechanism in FIG. 3 as a cross section taken along line IV-IV and viewed in the direction of the arrow. FIG. 5 is a detailed enlarged cross-sectional view showing a protruding state of a rod lower end portion of the screw type locking mechanism in FIG. FIG. 6 is an end view showing the lower end of the rod of FIG. 5 as viewed from below. FIGS. 1 to 4 show an unlocked state of the screw type locking mechanism, (a) is an overall perspective view of the screw type locking mechanism as seen from the lock nut side, and (b) is a partially broken perspective view of the lower end portion of the rod. FIG. FIG. 8 is an overall perspective view seen from the lock nut side of the screw-type lock mechanism, showing a state when the lock nut is rotated from the unlock position to the lock position in FIG. 7 by rotation in the tightening direction of the bolt. Fig. 8 shows the lock state of the screw type lock mechanism in which the lock nut is further rotated toward the lock base by rotating the bolt further in the tightening direction from the state of Fig. 8, and (a) shows from the lock nut side of the screw type lock mechanism. The overall perspective view seen, (b) is a partially broken perspective view of the lower end of the rod.

Hereinafter, embodiments of the present invention will be described in detail based on the illustrated examples.
<Configuration>
1 to 9 show a screw-type locking mechanism 1 according to an embodiment of the present invention,
1 and 2 show the screw type locking mechanism 1 in an unlocked state, and FIGS. 3 and 4 show the screw type locking mechanism 1 in a locked state.

1 to 4 is configured as a lock mechanism for detachably locking a large battery (not shown) of an electric vehicle such as an electric vehicle to a vehicle body.
The electric vehicle has a battery storage space (not shown) with a downward opening under the floor of the vehicle body, and a large battery (not shown) is detachably stored in the space and is driven by electric power from the battery. A motor to be used as a power source.

In order to be able to detachably store a large battery in a battery storage space with a downward opening of the vehicle body, a lock plate 3 having a rectangular opening 3a and a circular opening 3b in the center thereof is provided with any fastening means on the vehicle floor. Attach with.
When the large battery is detachably stored in the battery storage space with the downward opening, in this storage state, the screw type locking mechanism 1 provided on the battery and the lock plate 3 cooperate (lock), Assume that the battery is detachably attached to the lock plate 3 (vehicle body).

The screw type locking mechanism 1 will be described in detail below.
The screw type locking mechanism 1 includes a lock base 11, a bolt 12, and a lock nut 13 as main components.
The bolt 12 is rotatably inserted into the lock base 11 and is prevented from coming off by a flange 12b integrally formed at an end near the bolt head 12a.

As described above, the bolt 12 which is provided on the lock base 11 so as to be prevented from coming off and can be freely rotated includes a lock nut 13 screwed onto an end opposite to the above-mentioned fall-off preventing end.
The lock nut 13 is a rectangular nut as viewed in the screwing direction, and has a female screw for screwing into the bolt 12 at the center.

As shown in FIGS. 1 and 3, the central circular boss portion 11a of the lock base 11 restricts the rotation of the lock nut 13 between the unlock position shown in FIGS. 1 and 2 and the lock position shown in FIGS. Two stoppers 11b and 11c are provided.
The lock base 11 is further provided so as to surround the central circular boss portion 11a to form a seal member fitting groove 11d.

Of the rectangular hole 3a and the circular hole 3b provided in the lock plate 3, the former rectangular hole 3a allows passage of the lock nut 13 in the unlocked position shown in FIGS. 1 and 2, and the latter circular hole 3b. Is to allow passage of the central circular boss portion 11a provided on the lock base 11.
However, the diameter of the circular hole 3b is set so as not to allow passage of the lock nut 13 at the lock position shown in FIGS.

<Action>
The screw type locking mechanism 1 having the above configuration is provided with the lock base 11 attached to the battery and provided on the battery side,
When this battery is detachably stored in a battery storage space with a downward opening of the vehicle body, it performs a locking action as follows.

  When installing the battery, first, the lock nut 13 is rotated by rotating the bolt 12 (bolt head 12a) in the loosening direction opposite to the tightening direction indicated by the arrow in FIG. By 11b, it becomes the relaxation direction restriction position (unlock position) shown in FIGS. 1, 2 and 7 (a).

  After that, when the battery is inserted into the battery storage space with the downward opening of the vehicle body, the lock nut 13 passes through the rectangular hole 3a of the lock plate 3 as shown in FIGS. The circular boss portion 11a passes through the circular hole 3b of the lock plate 3 as shown in the figure, the lock nut 13 is located in the battery housing space, and the lock base 11 is exposed to the outside as shown in FIG. Sit on the bottom.

  In this state, when the bolt 12 is rotated by a nut runner or the like through the bolt head 12a in the tightening direction indicated by the arrow in FIG. 7 (a), the bolt 12 rotates with the lock nut 13, and the lock nut 13 is The tightening direction restriction position (lock position) shown in FIGS.

However, the lock nut 13 is not rotated by the bolt 12 beyond the tightening direction limit position (lock position), and stops at the rotational position as shown in FIG.
Therefore, when the bolt 12 is further rotated in the tightening direction, the lock nut 13 maintains the tightening direction restriction position (lock position) as shown in FIGS. 3 and 4 and FIG. And is stroked in a direction approaching the lock base 11.
As a result, the lock nut 13 and the lock base 11 can hold the lock plate 3 therebetween to hold the battery in the battery storage space.

In order to prevent muddy water from entering the battery storage space with this battery attached,
2 and 4, the seal member 15 is fitted into the seal member fitting groove 11d, and this seal member 15 is interposed on the seating surface between the lock base 11 and the lock plate 3,
As shown in FIGS. 1 to 4, a seal member 16 is interposed between the bolt flange 12b and the recess of the lock base 11 into which the bolt flange 12b is fitted.

When the battery is taken out from the battery storage space, the bolt 12 is rotated in the loosening direction through the bolt head 12a with a nut runner or the like in the locked state described above.
As a result, even if the lock nut 13 is separated from the lock plate 3 and rotated by the bolt 12, the lock nut 13 is moved from the tightening direction limit position (lock position) of FIGS. It only rotates to the relaxation direction restriction position (unlock position) in FIG. 7 (a), and thereafter stops at this relaxation direction restriction position (unlock position).

Therefore, when the bolt 12 is further rotated in the loosening direction, the lock nut 13 maintains the loosening direction restriction position (unlock position) and moves away from the lock base 11 as shown in FIGS. Stroke to.
Thus, the battery can be taken out from the battery storage space while the lock nut 13 is passed through the rectangular hole 3a of the lock plate 3 and the central circular boss portion 11a of the lock base 11 is removed from the circular hole 3b of the lock plate 3. it can.

<Recognition of lock nut status>
The locking operation described above may be performed manually or automatically. In any case, since the lock nut 13 is not exposed to the outside, the bolt head 12a is rotated in the tightening direction with a nut runner or the like. During the locking operation to be performed, the lock nut 13 cannot be recognized from the outside.
Therefore, the rotation of the lock nut 13 to the tightening direction restriction position (lock position) shown in FIGS. 3, 4, and 8 and the subsequent stroke in the screwing direction of the lock nut 13 cannot be recognized.
For this reason, there is anxiety that the work must be proceeded without such recognition when manually locking, even when a normal locked state cannot be obtained due to foreign objects during automatic locking, There is a risk of misjudging that the lock has been completed normally.

  Therefore, in this embodiment, even if the lock nut 13 cannot be directly recognized from the outside, the lock nut 13 can be rotated to the tightening direction restriction position (lock position) shown in FIGS. In addition, the following lock nut position detection structure is added to the screw type lock mechanism 1 so that the stroke in the screwing direction of the lock nut 13 can be recognized.

<Lock nut position detection structure>
This lock nut position detection structure has a rod 21 as a main component, and as shown in FIGS. 1 to 4, the rod 21 is provided to pass through the hollow hole of the bolt 12 so as to be rotatable and capable of axial stroke.
Then, a radial stay 22 protruding radially outward is fitted to the upper end of the rod 21 protruding from the upper end opening of the hollow hole of the bolt 12 close to the lock nut 13, and both ends thereof are respectively connected to the upper end surface of the lock nut 13. The upper end of the rod 21 is rotated and engaged with the lock nut 13 so that the upper end of the rod 21 can be displaced upward.

The lower end of the rod 21 that fits into the lower end opening of the hollow hole of the bolt 12 far from the lock nut 13 is the enlarged head 21a, and a downward axial force is applied to the rod 21 between the enlarged head 21a and the bolt 12. The elastic means such as the spring 24 is contracted.
The elastic means such as the spring 24 urges the rod 21 downward in the axial direction, and by this urging force, both ends of the radial stay 22 fitted to the upper end of the rod 21 are positioned in the upward opening groove of the stay receiver 23. Functions to continue.
Therefore, even during the approaching stroke of the lock nut 13 to the lock base 11 described above, the rod 21 moves integrally with the lock nut 13 while maintaining the rotational engagement between the upper end of the lock nut 13 and the lock nut 13.

The length of the rod 21 is such that when the lock nut 13 is in its maximum relaxed state as shown in FIGS. 1 and 2 and FIGS. 7 (a) and 7 (b), the lower end surface of the enlarged head 21a of the rod 21 is As shown in FIG. 7B, the length is determined to be flush with the lower end surface of the bolt 12 (bolt head 12a).
As shown in FIGS. 5 and 6, the lower end surface of the enlarged head 21a of the rod 21 has a rotation mark 21b related to the rotation position of the lock nut 13 (in the illustrated example, a minus groove shape is used, but the shape is arbitrary. ).
Further, a seal member 25 is interposed in a fitting portion between the enlarged head 21a of the rod 21 and the bolt 12, and muddy water or the like is prevented from entering from the fitting portion.

<Lock nut rotation recognition action>
When the battery is installed, the lock nut 13 in the unlocked position shown in FIGS. 1, 2 and 7 (a) is inserted into the battery housing space while being lifted into the battery housing space. When passing through the hole 3a and the lock base 11 is seated on the lower surface of the lock plate 3,
As shown in FIGS. 1 and 2 and FIG.7 (a), the lock nut 13 is in the unlock position and the stroke position furthest away from the lock base 11.
The enlarged head 21a of the rod 21, which is rotationally engaged with the lock nut 13 so as to integrally stroke, is in a rotational position equivalent to unlocking as shown in FIGS. 1, 2 and 7 (b). The lower end surface of the enlarged head 21a is at a stroke position where it is flush with the lower end surface of the bolt 12 (bolt head 12a).

  As described above, when the enlarged head 21a of the rod 21 is at the rotation position corresponding to the unlock shown in FIGS. 1, 2 and 7 (b), the rotation position of the rotation mark 21b engraved on the lower end surface is shown in these figures. (The rotation position indicated by the two-dot chain line in FIG. 6), and from the rotation position of the rotation mark 21b, the rotation position of the lock nut 13 is unlocked as shown in FIGS. 1, 2 and 7 (a). You can recognize the position.

Further, as described above, the lower end surface of the enlarged head 21a is flush with the lower end surface of the bolt 12 (bolt head 12a).
This means that the lock nut 13 is the stroke position farthest from the lock base 11 as shown in FIGS.

When locking, the lock nut 13 is rotated from the unlocked position in FIGS. 1, 2 and 7 (a) to the direction of the arrow in FIG. 7 (a) by rotating the bolt 12 in the tightening direction. When taken to the locked position in FIG.
The enlarged head 21a of the rod 21 that rotates and strokes integrally with the lock nut 13 changes from the rotation position corresponding to the unlocking position shown in FIGS. 1, 2 and 7 (b) to the rotation position corresponding to the locking position shown in FIGS. It is rotated.

With the rotation of the enlargement head 21a, the rotation mark 21b engraved on the lower end surface is switched from the rotation position indicated by the two-dot chain line in FIG. 6 to the rotation position indicated by the solid line, and from the rotation position of the changed rotation mark 21b. Then, it can be recognized that the rotational position of the lock nut 13 has reached the locked position as shown in FIG.
For this reason, it is possible to recognize the rotation of the lock nut 13 to the lock position, and to proceed with the manual lock work without anxiety. At the time of the automatic lock work, this lock can be completed as normal. Based on the determination, the automatic lock operation can be further advanced.

  At this time, since the lock nut 13 is still kept at the stroke position farthest from the lock base 11, the lower end surface of the enlarged head 21a is flush with the lower end surface of the bolt 12 (bolt head 12a). The stroke position remains at.

<Lock nut stroke recognition action>
After the lock nut 13 is rotated from the unlock position in FIGS. 1, 2 and 7 (a) to the lock position as shown in FIG. It stops at this locked position without being further driven around against 11c.

When the lock nut 13 remains in the locked position as shown in FIG. 8, the lock nut 13 approaches the lock base 11 as shown in FIGS. 3 and 4 and FIG. 9 (a) by further rotation of the bolt 12 in the tightening direction. The lock plate 3 is clamped between the lock nut 13 and the lock base 11 to perform locking.
At this time, the enlarged head 21a of the rod 21 that strokes integrally with the lock nut 13 maintains the rotation position corresponding to the lock position as shown in FIGS. 3 to 5 and FIG. 9 is projected downward from the lower end surface of the bolt 12 (bolt head 12a) by the amount of the approaching stroke, and the projecting amount is indicated by α in FIG. 9 (b).

Thus, based on the state in which the expansion head 21a protrudes downward from the lower end surface of the bolt 12 (bolt head 12a), the lock nut 13 clamps (locks) the lock plate 3 between the lock base 11 and the battery. You can recognize that has been attached to the car body.
As a result, the lock operation is proceeding normally, and based on the determination that this can be completed as normal,
Manual locking can be carried out without anxiety, and automatic locking can be further advanced.

<Effects of lock nut position detection structure>
According to the lock nut position detection structure of the present embodiment, the rod 21 that rotates and strokes together with the lock nut 13 is passed through the hollow hole of the bolt 12 so as to be rotatable and strokeable, and the bolt 12 (bolt head 12a) By attaching a rotation mark 21b related to the rotation position of the lock nut 13 to the end enlarged head 21a of the rod 21 exposed from the lower end surface,
Both the rotation of the lock nut 13 to the locked position accompanying the rotation of the bolt 12 in the tightening direction and the approach stroke of the lock nut 13 toward the lock base 11 after this rotation are caused by the rotation and stroke of the common single rod 21 Can be recognized from the outside.

In addition, since the rotation mark 21b is engraved on the lower end surface of the rod 21 (enlarged head 21a) exposed from the lower end surface of the bolt 12 (bolt head 12a),
There is an advantage that it is easy to recognize from below the rotation mark 21b required when the battery is inserted into the battery storage space with the downward opening and locked.

Furthermore, because the seal member 25 is interposed between the hollow hole of the bolt 12 and the rod 21,
Even though the rod 21 added to achieve the above-mentioned effects is installed through the hollow hole of the bolt 12, mud water or the like will enter the screw-type lock mechanism 1 from the through-installed part of the rod 21. Can be prevented.

Further, when correlating with the lock nut 13 so as to rotate and stroke the rod 21 penetrating the hollow hole of the bolt 12 together with the lock nut 13,
The rod 21 is urged by an elastic means such as a spring 24 in the axial direction from the lock nut 13 toward the retaining end of the bolt 12 (bolt head 12a), and the end of the rod 21 close to the lock nut 13 by this urging. Because the part is rotationally engaged with the lock nut 13 with the radial stay 22 and the stay receiver 23,
The mutual assembly of the bolt 12, the lock nut 13 and the rod 21 can be easily performed as follows.

That is, first, an elastic means such as a spring 24 is fitted to the rod 21 from the upper end of the rod 21 to which the radial stay 22 is to be attached, and the upper end of the rod 21 is moved with the elastic means such as the spring 24 riding on the expansion head 21a. The bolt 12 is inserted into the hollow hole from the lower end.
Next, the radial stay 22 is fitted to the upper end of the rod 21 protruding from the upper end opening of the hollow hole of the bolt 12.
At the time of this fitting, the radial stay 22 is fitted to the upper end of the rod 21 at a rotational position where it is perpendicular to the extending direction of the rotation mark 21b.

Thereafter, the rod 21 is pushed into the hollow hole of the bolt 12 while compressing the elastic means such as the spring 24, so that the radial stay 22 is positioned above the stay receiver 23 on the lock nut 13 screwed to the bolt 12. In this state, while rotating the rod 21, the radial stay 22 is set to a rotational position that aligns with the upward opening groove of the stay receiver 23.
By removing the pushing force of the rod 21 in this aligned state, the rod 21 is subjected to an axial force by elastic means such as a spring 24 and strokes in the corresponding direction, and both ends of the radial stay 22 are directed upward on the stay receiver 23, respectively. Enter into the opening groove.

  As described above, the three components of the bolt 12, the lock nut 13, and the rod 21 can be easily assembled together despite the addition of the rod 21.

When elastic means such as the spring 24 for controlling the bias of the rod 21 is accommodated in the hollow hole of the bolt 12 as shown in the example, and is contracted between the bolt 12 and the rod 21,
The elastic means such as the spring 24 becomes a built-in type, so that the configuration can be made compact, and it contributes to the improvement of the assembly workability described above, which is very advantageous.

<Other embodiments>
In the above, the rod 21 can recognize both the rotation and stroke of the lock nut 13,
Needless to say, only the rotation of the lock nut 13 may be recognized by rotationally engaging the upper end of the rod 21 and the lock nut 13 so as to be capable of relative displacement in the axial direction.

1 Screw type locking mechanism
3 Lock plate
3a Rectangular hole
3b circular hole
11 Lock base
11b, 11c stopper
11d Sealing member fitting groove
12 volts
12a bolt head
12b Retaining flange
13 Lock nut
15,16 Seal member
21 Rod
21a Expanding head
21b Rotation mark
22 Radial stay
23 Staying
24 Spring (elastic means)
25 Seal material

Claims (6)

The lock base is secured to the lock base, and a bolt is rotatably provided. A lock nut is screwed onto the end of the bolt opposite to the secured end, thereby limiting the rotation angle of the lock nut with respect to the lock base. In the screw-type lock mechanism that generates the clamping pressure between the lock base and the lock nut by rotating the bolt in the tightening direction,
A rod that interlocks with the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction passes through the hollow hole of the bolt and is rotatably provided;
A screw type locking mechanism, characterized in that a rotation mark relating to a rotation position of the lock nut is attached to an end portion of the rod exposed from an end surface of the bolt on the bolt end portion side which is prevented from coming off. In the screw type locking mechanism according to claim 1,
Correlating the rod with the lock nut so as to be interlocked with an approach stroke to the lock base after the lock nut is rotated to the limit position with the rotation of the bolt in the tightening direction;
A screw-type locking mechanism, wherein the rod is passed through the hollow hole of the bolt so as to be rotatable and strokeable. In the screw type locking mechanism according to claim 1 or 2,
The screw type locking mechanism, wherein the rotation mark is attached to an end surface of the rod exposed from an end surface of the bolt on the bolt end portion side which is prevented from coming off. In the screw type locking mechanism according to any one of claims 1 to 3,
A screw type locking mechanism, wherein a seal member is interposed between a hollow hole of the bolt and the rod. In the screw type locking mechanism according to any one of claims 2 to 4,
The rod is urged in the axial direction from the lock nut toward the bolt end portion that is prevented from coming off, and by this urging, the rod end portion close to the lock nut is rotationally engaged with the lock nut. A screw-type locking mechanism characterized by that. In the screw type locking mechanism according to claim 5,
A screw-type locking mechanism characterized in that an elastic means for energizing the rod is housed in a hollow hole of the bolt and is contracted between the bolt and the rod.

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