JP2006052745A - Fastening part protection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening part protection device capable of improving a security function further. <P>SOLUTION: This fastening part protection device is cmposed of a holder screw-fitted into a fastened object, a skirt surrounding the holder, a ball guide connected integrally with the skirt and forming a ball relief channel, a ball fitted into a ball holding channel and the ball relief channel of the skirt and engaging and disengaging with/from a ball locking channel of the holder, a stopper fitted into the skirt so as to prevent rotation and move in the direction of the axis of the ball guide and forming a cam slope in a base part, a spring for energizing the stopper to press the ball on the cam slope, and a dial lock provided in the skirt and unlocked when a mark on an outer peripheral face of a dial is aligned on a row of unlocking marks set in advance. When rotating the dial and setting it to the row of unlocking marks, the stopper can move, and the ball escapes from the ball locking channel to pull the skirt out of the holder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a fastening portion protection device that is applied to a fastener by screwing such as a bolt or a nut and prevents an unauthorized person from accessing the fastener.

Conventionally, a building such as a steel tower or a building is assembled by using fasteners such as bolts and nuts, and mechanical parts are fixed to a facility such as a railway. Also, in consumer devices such as game machines, it is common practice to fasten and fix management key switches to an operation panel with a fastener.

However, since the operation tool for this type of fastener is generally widely marketed as a pliers or a spanner, an incident has occurred in which an outsider intentionally removes a fastening point of a power transmission tower or railroad track. In game machines and the like, incidents such as releasing the fastener and removing the key switch, or improperly modifying the control electronic circuit are frequently occurring.

Therefore, various dedicated fastening part removal prevention tools have been proposed, and as the latest one, a cover member that surrounds at least the torque transmission part from one side in the axial direction of the fastener and has a groove on the inner peripheral side, By pressing from the outer peripheral side so that the outer peripheral side portion is urged to fit into the groove on the inner peripheral side of the cover member and can slide along the inner peripheral surface where the groove of the cover member is not formed. Some include a spring member whose diameter can be reduced and a restraining member that restrains the spring member with respect to the axial direction of the fastener (see Patent Document 1).

This fastening part removal prevention tool has the advantage that the structure is simplified and there are no components protruding outward, and the bolt can be prevented from being removed on either the head side or the tip side. Since the insertion hole of the operating tool for driving in the direction of diameter reduction is formed through the side wall portion of the cover member, by inserting a thin metal rod from the side without using a regular operating tool Since anyone can easily drive the spring member to remove the cover member from the fastener, there remains a problem in terms of security.

Japanese Patent Laid-Open No. 2003-113829

The problem to be solved by the present invention is that, unless the authorized person is informed of the regular unlocking code string, the protection means cannot be released. Is to provide.

The main feature of the fastening part protection device of the present invention is a holder that is screwed into a screw part of a fastened object and attached to the fastened object, and has a ball locking groove formed annularly on the outer peripheral surface of the tip part,
An idling skirt that surrounds both the fastener and the holder that fastened and fastened the object to be fastened to the object to be fastened, and that has an annular ball holding groove facing the ball locking groove on the inner peripheral surface of the tip portion; ,
A ball guide formed integrally or integrally connected to the inside of the front end of the skirt, and having a ball relief groove communicating with the ball locking groove and the ball holding groove in an axial direction;
A main part is fitted into the ball holding groove and the ball escape groove, and a part of the ball is engaged with and disengaged from the ball locking groove;
A cam inclined surface that is fitted between the skirt and the ball guide so as to be non-rotatable with respect to the ball guide and is movable in the axial direction of the ball guide, is formed at the base end portion. With the stopper
A stopper urging spring that urges the stopper to move toward the base end of the skirt so that the ball is pushed toward the holder by the cam slope;
The skirt and the ball guide are equipped with a dial lock that is unlocked when the codes attached to the outer peripheral surfaces of the plurality of dials are aligned with a preset unlock code string,
When the plurality of dials are rotated and set to the unlocked code string, the stopper is movable in the direction of the tip of the ball guide, and the ball escapes from the ball locking groove, whereby the skirt is That is, it can be removed from the holder.

In the first aspect of the present invention, when the stopper is restrained from moving in the direction of the tip of the skirt by the restriction measure of the dial lock, a part of the ball is engaged with the ball locking groove of the holder. Therefore, the skirt only idles around the axis of the holder by the ball locking groove and the guiding action of the ball, and the skirt cannot be removed from the holder. Therefore, it is impossible to remove the holder and the fastener from the screw portion of the fastened object, and access to the fastened object by an unauthorized person is completely prevented, and the security function is further improved. A fastener protection device is obtained.

When releasing the protective means, the movement restraint of the stopper is released by rotating the dials of the dial lock so as to obtain a predetermined unlocking code string, so that only the skirt is pulled in the axial direction. Since the restriction of the skirt pulling out by the ball is released, the operation procedure is greatly simplified and the speed of the unlocking operation is excellent.

In addition, after the holder is screwed into the screw portion of the fastened portion, and only by fitting the skirt to the holder and the fastener, a part of the ball is automatically engaged with the ball locking groove of the holder. After that, since it is only necessary to rotate the dial of the dial lock at random, the locking operation is easy.

  The holder, skirt, stopper, ball, and dial lock are made of metal material, making them rigid against mechanical impacts and being strong against attacks such as blows and twisting by Service-to-Self. To do.

In the illustrated embodiment, the object 1 to be fastened is a key switch made of a combination of a cylinder lock and a microswitch, and a fastener 4 made of a nut is screwed onto a screw portion 3 formed on the outer peripheral surface of the fixed outer cylinder 2. The object 1 to be fastened is fastened and fixed to the object 6 to be fastened by sandwiching the object 6 to be fastened consisting of the operation panel between the front end flange 5 of the fixed outer cylinder 2 and the fastener 4. . A waterproof ring 7 is inserted between the fastener 4 and the fastening object 6. A holder 8 whose hexagonal cross section is nut-shaped is abutted against the fastener 3 and screwed into the screw portion 3. The half of the front end side of the holder 8 is formed in a cylindrical portion having a circular cross section, and a ball locking groove 9 is formed in an annular shape on the outer peripheral surface of the front end portion (the outer peripheral surface of the right end portion in FIG. 8).

The cylindrical skirt 10 is formed to have a length that surrounds not only the fastening portion 3 and the holder 8 but also the entire main portion of the fastened object 1. The base end portion of the cylindrical ball guide 11 is fitted inside the distal end portion of the cylindrical skirt 10 (inside the right end portion in FIG. 8). The skirt 10 and the ball guide 11 are integrally connected by four spring pins 14 inserted into the through holes 13 of the ball guide 11 from the through holes 12 of the skirt 10. The ball holding groove 15 formed in an annular shape on the inner peripheral surface of the tip portion is formed in a stepped groove shape in which the peripheral wall of the skirt 10 is removed outward, and a steel ball 16 is applied to the bottom surface 15a. Touch.

The ball holding groove 15 of the skirt 10 is a ball locking groove of the holder 8 when the skirt 10 is fitted to the fastened object 1 by a predetermined amount until the base end surface (left end surface in FIG. Face 9 Four ball escape grooves 17 of the ball guide 11 are provided at intervals of 90 degrees. As shown in FIG. 8, in the locked state, the ball locking groove 9 and the ball holding groove 15 face the corners on the tip end side (right end side in FIG. 8) of the ball escape groove 17. Most of the ball 16 is always engaged with the ball holding groove 15 of the skirt 10 and the ball escape groove 17 of the ball guide 11, and a part of the ball 16 is placed in the holder 8 according to the position of the cylindrical stopper 18. Is engaged with and disengaged from the ball locking groove 9.

The spring pin 21 inserted into the slot 20 in the axial direction of the ball guide 11 from the through-hole 19 of the stopper 18 can prevent the stopper 18 from rotating with respect to the ball guide 11 and can move in the axial direction of the ball guide 11. It is joined. The stopper 18 is fitted in an annular space between the ball guide 11 and the skirt 10, and a base end portion (left end portion in FIG. 8) of the stopper 18 partially enters the ball holding groove 15 of the skirt 10.

On the inner peripheral surface of the tip portion (right end portion in FIG. 8) of the skirt 10, a step groove 22 that is slightly larger is formed adjacent to the ball holding groove 15. A spring receiving projection 23 is formed in an annular shape on the outer peripheral surface of the base end portion (left end portion in FIG. 8) of the stopper 18, and the spring receiving projection 23 is fitted in the step groove 22.
The stopper urging spring 24 fitted to the outer side of the intermediate portion of the stopper 18 is compressed between the spring receiving projection 23 and the first change ring 25 of the dial lock DL, and the stopper 18 is moved toward the proximal end portion of the skirt 10 ( The movement is biased to the left in FIG. The elastic force acting in the axial direction of the spring 24 is changed in the cam inclined surface 26 in the direction of the holder 8, that is, in the centripetal direction, and acts in the direction of maintaining the engagement state between the ball 16 and the ball locking groove 9. A first stop protrusion 27 is formed in the axial direction on a part of the outer surface of the intermediate portion of the stopper 18, and a second stop protrusion 28 is formed in the axial direction on a part of the tip face.

The dial lock DL includes a first change ring 25, a second change ring 29, a first dial 30 and a second dial 31. The first dial 30 is fitted on the outer side of the distal end portion of the stopper 18 in abutment with the distal end surface of the skirt 10. A plurality of symbols (numerals, alphabets, symbols, etc.) are provided at equal intervals on the outer peripheral surface of the first dial 30, and the first ring is provided on the side surface (left side surface in FIG. 8) on the base end side of the dial 30. The accommodation groove 32 is formed in an annular shape. A first click receiving groove 33 is formed in a part of the bottom surface of the first ring receiving groove 32.

The first change ring 25 is housed in the first ring housing groove 32 of the first dial 30 and is fitted on the outer side of the distal end portion of the stopper 18. A part of the inner peripheral surface of the first change ring 25 has a first engagement with the first stop protrusion 27 of the stopper 18 when the stopper 18 moves in the direction of the tip of the skirt 10 (rightward in FIG. 8). A stop receiving groove 34 is formed. First click grooves 35 are formed at equal intervals on the side surface (the right side surface in FIG. 8) on the front end side of the first change ring 25.

The second dial 31 is fitted on the outer side of the intermediate portion of the ball guide 11 so as to abut the tip flange portion 36 of the ball guide 11 and the first dial 30. A plurality of codes (numerals, alphabets, symbols, etc.) are attached to the outer peripheral surface of the second dial 31 at equal intervals. A second ring receiving groove 37 is formed in an annular shape on the side surface (left side surface in FIG. 8) of the base end side of the second dial 31, and a second click receiving groove 38 is formed in a part of the bottom surface of the second ring receiving groove 37. Is formed.

The second change ring 29 is housed in the second ring housing groove 37 of the second dial 31 and is fitted on the outer side of the intermediate portion of the ball guide 11. A second part of the inner peripheral surface of the second change ring 29 is engaged with the second stop projection 28 of the stopper 18 when the stopper 18 moves in the direction of the tip of the skirt 10 (rightward in FIG. 8). A stop receiving groove 39 is formed, and second click grooves 40 are formed at equal intervals on the side surface on the tip side (the right side surface in FIG. 8).

The first click body 41 is accommodated in the first click accommodation groove 33 of the first dial 30, and the skirt 10 is engaged with and disengaged from the first click groove 35 of the first change ring 25 as the first dial 30 rotates. Toward the left (in the left direction in FIG. 8) by the compression coil spring 42. The second click body 43 is accommodated in the second click receiving groove 38 of the second dial 31, and is engaged with and disengaged from the second click groove 40 of the second change ring 29 as the second dial 31 rotates. It is biased by the compression coil spring 44 toward the dial 30 (leftward in FIG. 8).

The main points of the operation of the fastening portion protection apparatus of the illustrated embodiment will be described below.
At the time of shipment from the factory, a round bar-shaped unlocking code string setting jig 45 is inserted into the cavity of the assembly of the skirt 10 and the ball guide 11. It is pushed in the centrifugal direction by the inclined cam surface 48 of the jig 45 for use. At the final stage when the unlocking code string setting jig 45 is fully inserted, the whole is pushed into the ball escape groove 17 of the ball guide 11 and the ball holding groove 15 of the skirt 10.

In this state, the stopper 18 is pushed to the right in FIG. 10 against the bias of the spring 24, and the first stop projection 27 of the stopper 18 is engaged with the first stop receiving groove 34 of the first change ring 25. The second stop projection 28 of the stopper 18 is engaged with the second stop receiving groove 39 of the second change ring 29. Therefore, the first change ring 25 and the second change ring 29 are restrained so as not to rotate with respect to the skirt 10, and the first dial 30 and the second dial 31 can rotate with respect to the skirt 10.

Therefore, the unlocking code string is obtained by arbitrarily rotating the first dial 30 and the second dial 31 by an integral multiple of a predetermined unit angle under the click function of the first click body 41 and the second click body 43. Can be changed arbitrarily. As shown in FIG. 9, when the first dial 30 and the second dial 31 are pulled out of the cavity without rotating, the unlocked code string as initially set at the factory shipment stage is used as it is. .

When the unlocking code string setting jig 45 is pulled out from the cavity, the stopper 18 is pushed in the left direction by the bias of the spring 24 in FIG. 10, and the stopper 21 has the pin 21 at the left end of the slot 20. Move to the position where it engages the corner on the side. With this movement of the stopper 18, as shown in FIG. 9, the ball 16 is pushed by the cam slope 26 of the stopper 18 and moves in the centripetal direction, and a part of the ball 16 comes to a standby position protruding from the inner peripheral surface of the ball guide 11. .
As shown in FIG. 9, the holder 8 is carried into the site in a state separated from the assembly of the skirt 10 and the ball guide 11.

At the site of use, when mounting the fastened object 1 (the key switch) shown in FIGS. 5 and 6, the holder 8 is first screwed into the screw portion 3 of the fixed outer cylinder 2 of the fastened object 1. The holder 8 is abutted against the fastener 4 made of a nut. In the process of putting the assembly of the skirt 10 and the ball guide 11 on the fastened object 1, the holder 8, and the fastener 4, the inclined cam surface 46 at the tip end portion (right end portion in FIG. 9) of the ball 16 protrudes. Hit the part. Therefore, the ball 16 is pushed in the centrifugal direction by the action of the inclined cam surface 46, and the whole ball 16 is pushed into the ball holding groove 15 of the skirt 10 and the ball escape groove 17 of the ball guide 11. At the same time, the stopper 18 pushed by the ball 16 is pushed toward the tip of the skirt 10.

When the assembly of the skirt 10 and the ball guide 11 is loaded to a predetermined position, the ball 16 comes to a position facing the ball locking groove 9 of the holder 8, so that the ball 16 under the bias of the spring 24 is instantaneous. To the ball locking groove 9 automatically. At the same time, the stopper 18 also moves in the direction of the proximal end of the skirt 10 to establish the locked state as shown in FIG. In this locked state, the first stop protrusion 27 of the stopper 18 is disengaged from the first stop receiving groove 34 of the first change ring 25, and the second stop protrusion 28 of the stopper 18 is the second stop receiving groove of the second change ring 29. The first change ring 25 and the second change ring 29 are set so as to be rotatable with respect to the skirt 10 because they are separated from 39.

When the first dial 30 and the second dial 31 are turned, the first click body 41 and the second click body 43 are effective, so that the first change ring 25 and the second change ring 29 are respectively connected to the first dial 30. And the second dial 31 rotate together.
That is, if the first dial 30 and the second dial 31 are rotated at random after the locked state is established, an unauthorized person who does not know the proper unlocked code string can be used by the first dial 30 and the second dial 31. No matter how many times they are turned, they simply run idle and cannot be unlocked.

A legitimate authorized person who knows the regular unlocking code string turns the first dial 30 and the second dial 31 and, as shown in FIG. When the code strings are aligned, as shown in FIG. 4, the first stop receiving groove 34 of the first change ring 25 faces the first stop protrusion 27 of the stopper 18, while the second change ring 29 has the second stop. An unlockable state is created in which the stop receiving groove 39 faces the second stop protrusion 28 of the stopper 18.

In this unlockable state, when the assembly of the skirt 10 and the ball guide 11 is pulled toward the tip end side along the axial direction, the ball 16 is pushed in the centrifugal direction by being pushed against the inner surface of the ball locking groove 9 of the holder 8. Following this, the stopper 18 moves to the tip end side, the first stop protrusion 27 of the stopper 18 engages with the first stop receiving groove 34 of the first change ring 25, and the second end of the stopper 18 is moved. The stop protrusion 28 engages with the second stop receiving groove 39 of the second change ring 29, and the ball 16 completely escapes from the ball locking groove 9 of the holder 8.

When the skirt 10 and the ball guide 11 are pulled as they are, the holder 8 is exposed when it is completely removed from the holder 8 and the fastened object 1. The authorized person can perform necessary operations such as reconfiguration of the structure, inspection and replacement of the equipment by removing the holder 8 and the fastener 4 from the screw portion 3 of the fastened object 1.

It is a top view of the fastening part protection apparatus which concerns on the Example of this invention, and has shown the state which accommodated the holder in the cavity part of the assembly of a skirt and a ball guide. It is a rear view of the fastening part protection apparatus of FIG. It is a front view of the fastening part protection apparatus of FIG. It is the sectional view on the AA line of FIG. It is a left view of the to-be-fastened object to which the fastening part protection apparatus of FIG. 1 is applied. It is a front view of the day fastening thing of FIG. It is a front view when the fastening part protection apparatus of FIG. 1 is mounted on an object to be fastened, and shows a locked state. FIG. 8 is a cross-sectional view of the main part of the line BB in FIG. 7. It is sectional drawing of the isolation | separation state of the fastening part protection apparatus of FIG. It is sectional drawing in the factory shipment stage of the fastening part protection apparatus of FIG. It is a left view of the unlocking code string setting jig applied to the fastening part protection apparatus of FIG. It is a front view of the holder in the fastening part protection apparatus of FIG. It is a top view of the holder of FIG. It is a front view of the skirt in the fastening part protection apparatus of FIG. It is a top view of the skirt of FIG. It is CC sectional view taken on the line of FIG. It is a rear view of the ball guide in the fastening part protection apparatus of FIG. It is a top view of the ball guide of FIG. It is the DD sectional view taken on the line of FIG. It is a front view of the stopper in the fastening part protection apparatus of FIG. It is a top view of the stopper of FIG. It is a rear view of the stopper of FIG. It is the EE sectional view taken on the line of FIG. It is a front view of the 1st dial in the fastening part protection apparatus of FIG. It is a rear view of the 1st dial of FIG. It is the FF sectional view taken on the line of FIG. It is a front view of the 1st change ring in the fastening part protection apparatus of FIG. It is a rear view of the 1st change ring of FIG. It is the GG sectional view taken on the line of FIG. It is a front view of the 2nd dial in the fastening part protection apparatus of FIG. It is a rear view of the 2nd dial of FIG. It is the HH sectional view taken on the line of FIG. It is a front view of the 2nd change ring in the fastening part protection apparatus of FIG. It is a rear view of the 2nd change ring of FIG. It is the II sectional view taken on the line of FIG. It is a front view of the 1st click body in the fastening part protection apparatus of FIG. It is a left view of the 1st click body of FIG. It is a front view of the 2nd click body in the fastening part protection apparatus of FIG. It is a left view of the 2nd click body of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fastened object 2 Fixed outer cylinder 3 Screw part 4 of a fixed outer cylinder Fastener 5 Front end collar part 6 of a fixed outer cylinder Fastening object 7 Waterproofing ring 8 Holder 9 Holder ball-locking groove 10 Skirt 11 Ball guide 12 Skirt Through hole 13 Ball guide through hole 14 Spring pin 15 Skirt ball retaining groove 16 Ball 17 Ball guide ball relief groove 18 Stopper 19 Stopper through hole 20 Ball guide slot 21 Spring pin 22 Skirt step groove 23 Stopper groove Spring receiving projection 24 Stopper biasing spring 25 First change ring 26 Stopper cam slope 27 Stopper first stop projection 28 Stopper second stop projection 29 Second change ring 30 First dial 31 Second dial 32 First dial The first ring receiving groove 33 of the first dial The first click receiving groove 34 of the first dial 1st stop ring groove 35 of 1 change ring 1st click groove 36 of 1st change ring 2nd ring receiving groove 38 of 2nd dial 2nd ring receiving groove 39 of 2nd dial 2nd change receiving groove 39 of 2nd dial Ring second stop receiving groove 40 Second check ring second click groove 41 First click body 42 First click body biasing spring 43 Second click body 44 Second click body biasing spring 45 Unlocking Code string setting jig 46 Holder tilt cam surface 47 Skirt code string display position 48 Unlocking code string setting jig tilt cam surface DL Dial lock

Claims (1)

A holder that is screwed into the threaded portion of the object to be fastened and attached to the object to be fastened, and has a ball locking groove formed annularly on the outer peripheral surface of the tip part;
An idling skirt that surrounds both the fastener and the holder that fastened and fastened the object to be fastened to the object to be fastened, and that has an annular ball holding groove facing the ball locking groove on the inner peripheral surface of the tip portion; ,
A ball guide formed integrally or integrally connected to the inside of the front end of the skirt, and having a ball relief groove communicating with the ball locking groove and the ball holding groove in an axial direction;
A main part is fitted into the ball holding groove and the ball escape groove, and a part of the ball is engaged with and disengaged from the ball locking groove;
A cam inclined surface that is fitted between the skirt and the ball guide so as to be non-rotatable with respect to the ball guide and is movable in the axial direction of the ball guide, is formed at the base end portion. With the stopper
A stopper urging spring that urges the stopper to move toward the base end of the skirt so that the ball is pushed toward the holder by the cam slope;
The skirt and the ball guide are equipped with a dial lock that is unlocked when the codes attached to the outer peripheral surfaces of the plurality of dials are aligned with a preset unlock code string,
When the plurality of dials are rotated and set to the unlocked code string, the stopper is movable in the direction of the tip of the ball guide, and the ball escapes from the ball locking groove, whereby the skirt is A fastening part protection device with a dial lock that can be removed from the holder.

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