JP2010196790A - 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 the lock position of a nut invisible from an external part. <P>SOLUTION: When rotating a bolt 12 in the arrow (fastening) direction, the nut 13 is rotated together by 90°, and is held in an illustrated lock position by a stopper 11b. 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 between the nut 13 and the lock base 11, and can lock a battery on a vehicle body. A leg 16 is arranged to a cap 14 displaced together with the nut 13, and this leg is penetrated through the lock base 11, and the rotation and stroke of the nut 13 can be recognized from the external part by the displacement of the leg 16 (the tip 16a) interlocking with the rotation and the stroke of the nut 13. <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.

The present invention can recognize the rotation of the lock nut to the limit position and the subsequent stroke of the lock nut in the screwing direction even if the lock nut cannot be directly recognized from the outside for the above reason. To be able to
It is an object of the present invention 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,
The lock nut is provided with a leg portion that interlocks with the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction and the approach stroke of the lock nut to the lock base after the rotation,
This leg portion is characterized in that it penetrates the lock base so that the tip of the leg portion can be recognized from the outside of the screw type locking mechanism.

According to the above-described screw-type lock mechanism of the present invention, the leg portion provided on the lock nut rotates to the limit position of the lock nut accompanying rotation of the bolt in the tightening direction, and to the lock base of the lock nut after this rotation. In conjunction with the approaching stroke, the tip of the leg can be recognized from the outside of the screw-type locking mechanism,
Both the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction and the approach stroke of the lock nut to the lock base after this rotation can be recognized from the tip position of the leg portion.

  For this reason, it is possible to recognize the rotation of the lock nut to the limit position and the subsequent approach stroke to the lock base, and to proceed with the manual lock work without anxiety. It can be determined that the lock can be completed as normal.

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 fragmentary perspective view of the threaded locking mechanism in FIG. 1 viewed from the lock nut side, showing the locking position. FIG. 2 is an overall perspective view of the screw type locking mechanism in FIG. 1 viewed from the lock nut side, showing the locking position. FIG. 2 is an overall perspective view of the screw-type locking mechanism in FIG. 1 viewed from the lock base side, showing the locking position. FIG. 5 is a plan view showing a lock base of the screw type locking mechanism in FIGS. FIG. 5 is a perspective view showing a cap of the screw type locking mechanism in FIGS. FIG. 5 is an enlarged cross-sectional view of a main part showing a seal structure for a leg through slit of the screw type locking mechanism in FIGS. FIG. 5 is an enlarged cross-sectional view of a main part showing a seal structure between a lower end of a cap opening and a lock base of the screw type locking mechanism in FIGS. FIGS. 4A and 4B are plan views used for explaining the operation of the screw type locking mechanism in FIGS. 1 to 4, wherein FIG. 4A is a plan view showing a state when the screw type locking mechanism is in an unlock position, and FIG. It is a top view which shows a state when a mechanism exists in a locked position. FIGS. 4A and 4B are bottom views used for explaining the operation of the screw type locking mechanism in FIGS. 1 to 4, wherein FIG. 4A is a bottom view showing a state when the screw type locking mechanism is in an unlocked position, and FIG. It is a bottom view which shows a state when a mechanism exists in a locked position.

Hereinafter, embodiments of the present invention will be described in detail based on the illustrated examples.
<Configuration>
1 to 10 show a screw type locking mechanism 1 according to an embodiment of the present invention,
FIG. 1 is a fragmentary perspective view of the threaded locking mechanism 1 viewed from the lock nut side, showing the unlocked position.
FIG. 2 is a cutaway perspective view of the main part as seen from the lock nut side, showing the screw type locking mechanism 1 in the locked position.
FIG. 3 is an overall perspective view showing the screw type locking mechanism 1 in the locked position, as viewed from the lock nut side.
FIG. 4 is an overall perspective view of the screw-type locking mechanism 1 viewed from the lock base side, showing the locking position.
FIGS. 5 to 8 are diagrams showing components of the screw type locking mechanism 1,
9 and 10 are explanatory views of the operation of the screw type locking mechanism 1. FIG.

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 the battery storage space with the downward opening of the vehicle body, it is arranged at the rectangular opening 3a and its center as shown by the two-dot chain line in FIGS. 9 (a) and 9 (b). The lock plate 3 having the circular opening 3b is attached to the floor surface of the vehicle body with any fastening means.
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 (see FIG. 2) 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 has a rectangular shape as shown in FIGS. 2 and 3 and FIGS. 9A and 9B when viewed in the screwing direction, and has a female screw for screwing into the bolt 12 at the center thereof.

Reference numeral 14 denotes a cap that covers and attaches to the central portion of the lock nut 13.
The entire cap 14 has an assembled shape as shown in FIG. 6, has a rectangular lock nut through hole 14a on the peripheral wall, a bolt through hole 14b on the top wall, and an open lower edge 12c on the lower end.
The cap 14 is configured to accommodate grease for lubricating each part of the screw type locking mechanism 1 therein.

As shown in FIGS. 2 and 5, the lock base 11 is rotated on the lock base 11 in the unlock position shown in FIGS. 1 and 9 (a), and in the lock shown in FIGS. 2, 3 and 9 (b). Two stoppers 11a and 11b are provided to limit the positions.
As shown in FIG. 5, the lock base 11 is further formed with a center hole 11c through which the bolt 12 passes, a circular groove 11d into which the lower edge 14c (see FIG. 6) of the cap 14 enters, and a seal member fitting groove 11e. To do.

Of the rectangular hole 3a and the circular hole 3b provided in the lock plate 3 as described above with reference to FIGS. 9 (a) and 9 (b), the former rectangular hole 3a is a lock nut in the unlock position shown in FIG. 9 (a). It is assumed that 13 passes and the latter circular hole 3b allows the cap 14 to pass.
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 FIG. 9 (b).

<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 indicated by the arrows in FIGS. 1, 9 (a) and 10 (a). The stopper 13a (see FIG. 5) 13 is used as a relaxing direction limit position (unlock position) shown in FIGS. 1 and 9 (a).

  Thereafter, when the battery is inserted into the battery housing 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 FIG. 9 (a), and the cap 14 is locked as shown in FIG. The lock nut 13 and the cap 14 are positioned in the battery storage space through the three circular holes 3b, and the lock base 11 is seated on the externally exposed lower surface of the lock plate 3.

  In this state, when the bolt 12 is rotated by the nut runner or the like through the bolt head 12a in the tightening direction indicated by the arrows in FIGS. 2, 9 (b) and 10 (b), the bolt 12 rotates the lock nut 13, The lock nut 13 is brought into a tightening direction limit position (lock position) shown in FIGS. 2 and 9 (b) by the stopper 11b (see FIGS. 2 and 5).

However, the lock nut 13 is not rotated by the bolt 12 beyond the tightening direction limit position (lock position), and remains at the rotational position as shown in FIGS.
Therefore, when the bolt 12 is further rotated in the tightening direction, the lock nut 13 is screwed in while maintaining the tightening direction limit position (lock position), and strokes 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,
A seal member (not shown) is fitted in the seal member fitting groove 11e shown in FIGS. 1 to 3, and this seal member is interposed on the seating surface between the lock base 11 and the lock plate 3,
As shown in FIG. 2, the seal member 15 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 is rotated by the bolt 12, the lock nut 13 is moved from the tightening direction restriction position (lock position) shown in FIGS. 2, 3 and 9 (b). It only rotates to the relaxation direction restriction position (unlock position) shown in FIG. 1 and FIG. 9 (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 keeps the loosening direction limit position (unlock position) and strokes away from the lock base 11.
Accordingly, the battery can be taken out from the battery storage space while allowing the lock nut 13 and the cap 14 to pass through the rectangular hole 3a and the circular hole 3b shown in FIG. 9 (a).

<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 limit position (lock position) indicated by the two-dot chain line in FIG. 4 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 tightening direction restriction position (lock position) of the lock nut 13 shown in FIGS. The following lock nut position detection structure is added to the screw-type lock mechanism 1 so that the rotation of the lock nut 13 and the subsequent stroke of the lock nut 13 in the screwing direction can be recognized.

<Lock nut position detection structure>
Legs 16 are provided on the lower opening edge 14c of the cap 14 that rotates and strokes with the lock nut 13 as shown in FIG.
The leg portion 16 extends downward from the opening lower edge 14c of the cap 14, is integrally formed with the cap 14, and penetrates the lock base 11 as shown in FIGS.

Therefore, the lock base 11 is formed with a slit 11f through which the leg 16 penetrates as shown in FIGS. 1 and 2, and the leg through-slit 11f is interlocked with the cap 14 as clearly shown in FIGS. 5 and 10 (a). Thus, an arc shape that does not hinder any displacement of the leg 16 that rotates and strokes is formed.
Further, the leg portion 16 can be recognized from the outside of the screw type locking mechanism 1 as a length such that the tip end 16a protrudes from the lower end opening of the leg portion through slit 11f.

Thus, in order to project the tip 16a of the leg portion 16 from the lower end opening of the leg portion through slit 11f, it is necessary to take measures to prevent muddy water and the like from entering the battery storage space from here.
For this reason, the shutter 17 for closing the lower end opening of the leg through slit 11f in the battery mounting state after the locking operation described above is shown in FIGS. 1, 2, 4, 7 and 10 (a), (b). Provide as follows.

The shutter 17 is slidably fitted to the leg tip 16a and is continuously seated on the lower end opening edge of the leg through slit 11f by any elastic means 18 such as a spring fitted to the leg tip 16a. .
Since the shutter 17 is for closing the lower end opening of the leg through slit 11f when the battery is attached, the shutter 17 has an arc shape corresponding to the shape and length of the leg through slit 11f.

  Further, since the shutter 17 rotates together with the tip 16a of the leg portion 16, the shutter 17 is locked so as to be guided between the unlock position shown in FIG. 10 (a) and the lock position shown in FIG. 4 and FIG. 10 (b). The base 11 is slidably fitted in a guide groove 11g formed on the bottom surface.

In order to reliably prevent muddy water, etc., that could not stop entering even with the shutter 17 above, to reach the battery storage space,
1 and 2 between the circular groove 11d (see FIGS. 5 and 8) on the lock base 11 into which the lower opening edge 14c (see FIG. 6) of the cap 14 enters and the inner peripheral surface of the lower end of the cap 14, respectively. , 8 as shown in FIG.

<Lock nut rotation recognition action>
When the battery is installed, the lock nut 13 in the unlock position shown in FIGS. 1 and 9 (a) passes through the rectangular hole 3a of the lock plate 3 and is locked by inserting the battery while raising it into the battery storage space. When the base 11 is seated on the lower surface of the lock plate 3,
Since the lock nut 13 is in the unlocked position shown in FIGS. 1 and 9 (a) and is in the stroke position farthest from the lock base 11, the lock nut 13 is attached to the cap 14 integrated with the lock nut 13. The tip 16a of the provided leg 16 is in a rotational position corresponding to the unlock shown in FIG. 10 (a), and the downward projecting amount from the leg through slit 11f is minimized.

At the time of locking, the lock nut 13 is rotated from the unlocked position in FIGS. 1 and 9 (a) to the locked position in FIGS. 2, 3 and 9 (b) by rotating the bolt 12 in the tightening direction. When
The tip 16a of the leg 16 provided on the cap 14 integrated with the lock nut 13 is moved from the rotation position corresponding to the unlocking position shown in FIG. 10 (a) to the rotation position corresponding to the locking position shown in FIGS. 4 and 10 (b). It is rotated.
However, since the lock nut 13 is maintained at the stroke position farthest from the lock base 11, the tip 16a of the leg portion 16 is still kept at the minimum amount of downward projection from the leg portion through slit 11f.

The lock nut 13 is unlocked by rotating the leg tip 16a from the rotation position corresponding to the unlock position shown in FIG. 10 (a) to the rotation position corresponding to the lock position shown in FIGS. 4 and 10 (b). It can be recognized that it has rotated to the locked position.
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.

<Lock nut stroke recognition action>
After the lock nut 13 is rotated from the unlock position in FIGS. 1 and 9 (a) to the lock position in FIGS. 2, 3 and 9 (b) as the bolt 12 rotates in the tightening direction, the lock nut 13 13 is not further rotated and stays in the locked position of FIGS. 2, 3 and 9 (b).

When the lock nut 13 stops at the locked position shown in FIGS. 2, 3, and 9 (b), the lock nut 13 strokes in a direction approaching the lock base 11 by further rotation of the bolt 12 in the tightening direction.
At this time, the tip 16a of the leg 16 provided on the cap 14 integral with the lock nut 13 maintains a rotational position corresponding to the lock position shown in FIG. 4 and FIG. The downward protrusion amount from the leg through slit 11f is increased by the approach stroke.

In this way, the lock nut 13 clamps the lock plate 3 between the lock nut 11 and the lock base 11 based on the state in which the leg tip 16a at the rotation position corresponding to the lock position increases the downward protrusion amount from the leg through slit 11f. (Lock) to recognize that the battery has been attached to the vehicle 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 leg 16 is provided on the grease cap 14 that is displaced together with the lock nut 13, and the leg 16 is attached to the lock base 11 so that the tip 16a can be recognized from the outside. Because it was penetrated
Both the rotation of the lock nut 13 to the lock position accompanying the rotation of the bolt 12 in the tightening direction and the approaching stroke of the lock nut 13 toward the lock base 11 after this rotation are common to one leg 16 (the tip 16a thereof). ) Can be recognized from the outside.

In addition, because the above-mentioned leg portion 16 is not provided directly on the lock nut 13, but is provided on the grease cap 14 that is displaced together therewith,
Even if a large force is applied to the lock nut 13 during the locking operation, the large force does not reach the leg portion 16, and it is possible to avoid the adverse effects such as the leg portion 16 being damaged or deformed.

Furthermore, the leg portion 16 is provided so as to extend downward from the opening lower edge 14c of the cap 14, and the tip 16a of the leg portion 16 is protruded from below the lock base 11, so that the above-described effects can be obtained.
Even if the lock base 11 requires a slit 11f for allowing the leg portion 16 to pass through, the shutter 17 can be easily sealed between the slit 11f and the leg portion 16.

The shutter 17 for sealing is provided so as to be slidably fitted to the leg 16 and is always seated on the opening edge of the leg through slit 11f by elastic means such as a spring 18.
Even if the leg 16 is displaced together with the lock nut 13 (cap 14), the seal between the slit 11f and the leg 16 can be reliably performed.

At this time, when the shutter 17 is seated on the downward opening edge of the leg through slit 11f on the side closer to the leg tip 16a as in this embodiment,
Mud water etc. will be shut off at the outermost side of the lock base 11, the mud accumulation place can be on the outermost side of the safe lock base 11, and there is no restriction on the installation space of the shutter 17 and the plate thickness is sufficient Can be a thing.

<Other embodiments>
In the above description, the leg portion 16 is provided on the grease cap 14 that is displaced together with the lock nut 13. However, it goes without saying that the leg portion 16 may be provided directly on the lock nut 13.
In any case, the leg 16 is not limited to be provided so as to be integrally linked to the lock nut 13 (cap 14), and any leg can be used as long as it responds to the displacement of the lock nut 13 (cap 14). Of course, it may be the one of the installation point.

1 Screw type locking mechanism
3 Lock plate
3a Rectangular hole
3b circular hole
11 Lock base
11a, 11b stopper
11c Bolt hole
11e Sealing member fitting groove
11f Leg through slit
11g Shutter guide groove
12 volts
12a bolt head
12b Retaining flange
13 Lock nut
14 cap
14c Opening edge
15 Seal material
16 legs
16a Leg tip
17 Shutter
18 Spring (elastic means)
19,20 Seal member

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,
The lock nut is provided with a leg portion that interlocks with the rotation of the lock nut to the limit position accompanying the rotation of the bolt in the tightening direction and the approach stroke of the lock nut to the lock base after the rotation,
A screw-type locking mechanism, wherein the leg portion is passed through a lock base so that the tip of the leg portion can be recognized from the outside of the screw-type locking mechanism. In the screw type locking mechanism according to claim 1,
A screw-type locking mechanism, wherein a shutter for closing a leg portion through slit provided in the lock base is provided so that the leg portion penetrates. In the screw type locking mechanism according to claim 1 or 2,
A screw type locking mechanism characterized in that the lock nut is covered with a cap and fixed, and the leg portion is set to the cap. The screw type locking mechanism according to claim 3, wherein the cap is a downward opening cap.
The screw-type lock is characterized in that the leg portion is set to extend downward from the lower edge of the opening of the cap and can be recognized by protruding the tip of the leg portion from below the lock base. mechanism. In the screw type locking mechanism according to any one of claims 2 to 4,
The screw type locking mechanism, wherein the shutter is provided to be slidably fitted to the leg portion, and is always seated on an opening edge of the leg portion through slit by an elastic means. In the screw type locking mechanism according to claim 5,
The shutter is slidably fitted to the tip of the leg, and is urged upward by the elastic means so as to be seated on the downward opening edge of the leg penetration slit closer to the leg tip. A screw-type locking mechanism characterized by that.

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