Adhesive Unit

Abstract

To provide a fastening unit that prevents disabling of a safety switch by an operation by allowing an authorized user (administrator) to easily remove and install components that make up the safety switch while preventing an unauthorized user (operator) from removing the components that make up the safety switch, and allows the administrator to easily replace the safety switch and an actuator.SOLUTION: A fastening unit includes: restricting means for restricting a fastening state in which components that make up a safety switch installed to ensure the safety of an operator in a facility are fastened to a wall or a door of the facility by a fastening member so that unlocking cannot be performed by an unauthorized user; and permitting means for allowing the user to release the fastening state when the user has authority.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fastening unit. [Background technology]

[0002] Safety switches (e.g., door interlock devices, guard interlock devices) are attached to the front door of a machine tool and / or the door of a safety fence around an industrial robot, etc. This safety switch is used for the purpose of detecting whether the door is open or closed (see, for example, Patent Documents 1 and 2).

[0003] Regarding safety switches, there is a standard called "ISO14119" that covers general requirements for the design and selection of interlocking devices related to safety guards of machines. Since the 2013 edition of this "ISO14119", it has been required that "if there is a motive to disable the safety switch, appropriate measures shall be taken." One of these measures is to "fix the safety switch and actuator so that they cannot be removed."

[0004] This is because an unauthorized user (worker) has a motive to disable the safety switch by, for example, removing the actuator (for example, wanting to carry out work with the door open).

[0005] The specific measures recommended in "ISO14119" to achieve "non-removable fixing of (safety switches and) actuators" include "welding," "adhesive," "one-way screws," "rivets," etc. These specific measures make it impossible for workers to easily remove safety switches and / or actuators that are fixed to doors, etc. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4229556 [Patent Document 2] Patent No. 6097250 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0007] On the other hand, these specific measures make it difficult even for an authorized user (administrator) to fine-tune the position of an actuator, etc., when installing the actuator, etc., and also make it difficult to replace an actuator, etc., after it has been installed using these specific measures.

[0008] The object of the present invention has been made in consideration of the above-mentioned conventional situation, and is to provide a fixing unit that prevents an operator from removing or attaching the parts that make up the safety switch, while allowing an administrator to easily remove or attach the parts that make up the safety switch, thereby preventing an operator from disabling the safety switch and facilitating the administrator's replacement of the safety switch and / or actuator, etc. [Means for solving the problem]

[0009] The first invention is a restricting means for restricting a fastening state of a component constituting a safety switch installed to ensure the safety of an operator within a facility, the component being fastened to a wall or a door of the facility by a fastening member so that an unauthorized user cannot release the fastening state; a permission means for enabling a user to release the stuck state when the user has authority; The fixing unit is provided with:

[0010] In the first aspect of the present invention, The components constituting the safety switch may be a switch body and / or an actuator that can move toward and away from each other.

[0011] In the first aspect of the present invention, The permission means may include an effecting means for exerting a force on the limiting means so as to bring the stuck state into a state in which the stuck state can be released, when the user has the authority.

[0012] In the first aspect of the present invention, the fastening member is a screw having a head for releasing the fixed state, the restricting means includes a shielding member that moves between a prohibiting position where the head is shielded so that the fixed state cannot be released and an enabling position where the head is exposed so that the fixed state can be released, the operating means is a moving mechanism that moves the shielding member between the prohibited position and the permitted position, The authorization means authenticates the presence or absence of a user's authority by a physical or electronic key; The moving mechanism may move the shielding member by the power of locking / unlocking using the key.

[0013] In the first aspect of the present invention, The fastening member is a screw having a head with a rotation input portion formed on a side surface thereof, the restriction means includes a restriction member that moves between a prohibited position where the restriction member faces at least a part of the side surface and approaches or contacts the side surface so that the fixed state cannot be released, and an allowed position where the restriction member is separated from the fastening member and can release the fixed state, the operating means is a moving mechanism that moves the regulating member to the prohibition position and the permission position, The authorization means authenticates the presence or absence of a user's authority by a physical or electronic key; The moving mechanism may move the restricting member by a force generated when the key is used to lock or unlock the door. Effect of the Invention

[0014] According to the present invention, while preventing an operator from attaching or detaching the components constituting the safety switch, an administrator can easily attach or detach the components constituting the safety switch. This makes it possible to provide a fastening unit that prevents an operator from disabling the safety switch and makes it easy for an administrator to replace the safety switch and / or the actuator. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic front view showing a usage state (door closed state) of the fastening unit in the first embodiment. [Diagram 2] FIG. 2 is a plan view of a component (actuator) that constitutes the safety switch in the first embodiment. [Diagram 3] 1A is a plan view, FIG. 1B is a cross-sectional view (cross-sectional view taken along line II), and FIG. 1C is a cross-sectional view of the lock, in a locked state of a fastening unit in a first embodiment. [Figure 4] 1A is a plan view and FIG. 1B is a cross-sectional view (cross-sectional view taken along line I′-I′) of a fastening unit in an unlocked state in the first embodiment. [Diagram 5] 13A is a plan view of the fastening unit in the locked state in the second embodiment, and FIG. 13B is a cross-sectional view (cross-sectional view taken along line II-II) of the lock. [Figure 6] 13A is a plan view and FIG. 13B is a cross-sectional view (cross-sectional view taken along line II'-II') of the fastening unit in an unlocked state in a second embodiment. [Figure 7] 13A is a plan view of the fastening unit in the locked state in the third embodiment, and FIG. 13B is a cross-sectional view (cross-sectional view taken along line III-III) of the lock. [Figure 8] 13A is a plan view and FIG. 13B is a cross-sectional view (cross-sectional view taken along line III'-III') of a fastening unit in an unlocked state in a third embodiment. [Figure 9] 13A is a plan view of a shielding member in a prohibited position, and FIG. 13B is a plan view of a shielding member in a permitted position in a fourth embodiment. [Figure 10]FIG. 13 is a side view of the fastening unit in the locked state in the fifth embodiment. [Figure 11] 13A is a side view of the fastening unit in a locked state, and FIG. 13B is a side view of the fastening unit in an unlocked state in a sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [First embodiment] A fastening unit 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 4. The fastening unit 1 is applied to fasten (fix) components such as an actuator constituting a safety switch 500, as shown in Figure 1.

[0017] <Safety switch explanation> The safety switch 500 is attached to the front door of a machine tool or other facility and / or to a door of a facility such as a safety fence around an industrial robot, and is used for detecting whether the door is open or closed. The safety switch 500 is installed to ensure the safety of workers within the facility.

[0018] <Description of the fastening unit> The fixing unit 1 fixes the components constituting the safety switch 500 to a wall W or a door D of the facility using fastening members. The fixing unit 1 allows an administrator (authorized user) to easily release the fixed state of the components, but prevents an operator (unauthorized user) from releasing the fixed state of the components.

[0019] That is, the fastening unit 1 restricts (prohibits) an operator from attaching or detaching the components of the safety switch 500.

[0020] On the other hand, the fixing unit 1 can set the administrator in a state in which the fixed state of the parts can be released. Specifically, the administrator is permitted to access the fastening members, and can easily adjust the position of the parts of the safety switch 500 and replace the parts by adjusting the fastening state of the fastening members.

[0021] In this embodiment, an actuator 510 is used as an example of a component constituting the safety switch 500, and screws 20A and 20B are used as an example of a fastening member.

[0022] In the following description, the term "user" refers to both workers and administrators.

[0023] <Safety switch and fastening unit configuration> The safety switch 500 is composed of an actuator 510 and a switch body (switch) 520. The actuator 510 is disposed on the door D, and is a member that can be inserted into and removed from the switch body 520 (an insertion hole formed in the side surface as viewed from the right side of the paper in FIG. 1).

[0024] As shown in FIG. 2, the actuator 510 is composed of a tip end portion 511, a base end portion 512, and the like.

[0025] Tip portion 511 is a portion that is inserted into switch body 520, and when inserted, engages with the internal mechanism of switch body 520. Tip portion 511 is composed of notch 511a formed by cutting out the tip, and hollow opening 511b.

[0026] Base end portion 512 is formed to be wider (length in the vertical direction in FIG. 2) than tip portion 511. Base end portion 512 is formed with attachment holes 513A and 513B.

[0027] As shown in FIG. 1, the actuator 510 is fixed to the surface of the door D by the screws 20A, 20B (see FIGS. 3 and 4) inserted into the mounting holes 513A, 513B.

[0028] In accordance with the sliding of the door D (opening and closing movement in the left-right direction on the paper surface of FIG. 1), the actuator 510 is inserted into and removed from the switch body 520. That is, the actuator 510 and the switch body 520 move toward and away from each other.

[0029] The switch body 520 is installed on a wall W, and switches the output state of the safety switch 500 by inserting and removing the actuator 510. This detects the open / closed state of the door D. Fig. 1 shows a state in which the sliding door D is closed and the actuator 510 is inserted into the switch body 520.

[0030] As shown in FIG. 3, the fastening unit 1 includes a receiving portion 10, screws 20A, 20B, a restricting means 30 and an enabling means 40.

[0031] 3(B), the accommodating section 10 has an opening 11 formed therein, and accommodates the restricting means 30 and a part of the permitting means 40. The accommodating section 10 includes a base 12 and a cover 13, which are made of, for example, metal.

[0032] The base 12 is a plate-like member made of, for example, a metal, in which mounting holes 12A and 12B (12B is not shown) are formed.

[0033] The mounting holes 12A and 12B of the base 12 face the mounting holes 513A and 513B of the actuator 510. Screws 20A and 20B are inserted into the mounting holes 12A and 12B, respectively. As shown in Fig. 1, the base 12 is fixed (in a fixed state) to the surface of the door D together with the actuator 510 by these screws 20A and 20B.

[0034] The cover 13 is formed in a concave shape so as to be able to accommodate the restricting means 30 etc. The cover 13 is, for example, a metal plate-like member, and is fixed to the base 12 by welding.

[0035] 4, the screw 20A (20B) is a hexagonal socket bolt, and is a fastening member that fixes the storage unit 10 and the actuator 510 to the surface of the door D. The screw 20A (20B) has a head 21A (21B) in which a hole (e.g., hexagonal) that is a rotation input portion is formed, and a threaded portion 22A (22B) in which a thread groove is formed.

[0036] Then, for example, the administrator uses a screwdriver having a shape corresponding to the holes in the heads 21A and 21B to rotate the heads 21A and 21B, thereby removing the screws 20A and 20B. This releases the stuck state of the actuator 510.

[0037] The restricting means 30 restricts the operator from releasing the stuck state of the actuator 510. The restricting means 30 includes a shielding member 31.

[0038] The shielding member 31 moves (slides) between a prohibited position shown in Fig. 3 and a permitted position shown in Fig. 4 as a moving mechanism 41 described later is driven. Specifically, the shielding member 31 slides between the prohibited position and the permitted position while being guided by the upper surface of the base 12 and the inner wall surface of the cover 13.

[0039] In the prohibited position of FIGS. 3(A) and 3(B), the shielding member 31 shields the heads 21A, 21B of the screws 20A, 20B, making it impossible to release the fixed state of the actuator 510.

[0040] Furthermore, in the permitted position of FIG. 4(A) and FIG. 4(B), the shielding member 31 exposes the heads 21A, 21B of the screws 20A, 20B, making it possible to release the fixed state of the actuator 510.

[0041] The permission means 40 includes a movement mechanism 41 and a lock 42. If a user has authority (if the user is an administrator), the permission means 40 puts the user in a state in which the stuck state of the actuator 510 can be released.

[0042] The moving mechanism 41 includes a rotating part 411, an eccentric rotor 412, and a spring 413. When the user has authority (when the user is an administrator), the moving mechanism (acting means) 41 applies a force (power) to the limiting means 30 (shielding member 31) so that the actuator 510 can be released from its stuck state. Specifically, the moving mechanism 41 moves the shielding member 31 between a prohibited position and a permitted position.

[0043] 3(C), the rotating part 411 is integrally formed with the key cylinder 421 of the lock 42. The rotating part 411 rotates by turning the key 50 inserted into the key cylinder 421. As the rotating part 411 rotates, the eccentric rotor 412 also rotates.

[0044] Eccentric rotor 412 is a plate-shaped member, and is fixed to rotating part 411. Eccentric rotor 412 rotates between the position shown in Figure 3(A) and the position shown in Figure 4(A) as rotating part 411 rotates.

[0045] One end of spring 413 is fixed to base 12, and the other end is fixed to shielding member 31. Spring 413 urges shielding member 31 in a direction toward the inside of accommodating section 10. Due to the urging force of spring 413, shielding member 31 is always in contact with the side surface of eccentric rotor 412.

[0046] For example, when the eccentric rotor 412 rotates clockwise from the position shown in Fig. 4(A) to the position shown in Fig. 3(A), the shielding member 31 slides from the permitted position to the prohibited position. When the eccentric rotor 412 rotates counterclockwise from the position shown in Fig. 3(A) to the position shown in Fig. 4(A), the shielding member 31 slides from the prohibited position to the permitted position due to the biasing force of the spring 413.

[0047] The lock 42 can be locked and unlocked using a corresponding key 50. In this embodiment, the lock is locked so that the eccentric rotor 412 cannot rotate counterclockwise when the shielding member 31 is in the prohibited position (position in FIG. 3). The lock is unlocked when the shielding member 31 is in the permitted position.

[0048] Therefore, by locking the lock 42, a worker who is a user who does not have the key 50 cannot access the heads 21A, 20B of the screws 20A, 20B. In other words, the worker cannot release the fixed state of the actuator 510, and therefore it is possible to prevent the worker from disabling the actuator.

[0049] On the other hand, the administrator, who is a user who possesses the key 50, can move the shielding member 31 to the permitted position by unlocking the lock 42. This allows the administrator to access the heads 21A, 20B of the screws 20A, 20B, and the administrator can easily replace the actuator, etc. When the key 50 is not in use, it can be removed from the key cylinder 421 and stored by the worker.

[0050] <Operation of the adhesion unit> For example, in normal times when the user does not need to access the screws 20A and 20B, the fixing unit 1 (lock 42) is in a locked state. Therefore, as shown in Fig. 3, the shielding member 31 is in the prohibited position and shields the heads 21A and 21B of the screws 20A and 20B. Therefore, the operator cannot release the fixed state of the actuator 510.

[0051] On the other hand, when the administrator needs to access the actuator 510, the administrator can unlock the fixed unit 1 (lock 42) using the key 50. Specifically, when the administrator inserts the key 50 into the key cylinder 421 and rotates it counterclockwise, the eccentric rotor 412 rotates counterclockwise together with the rotating part 411, and the shielding member 31 slides from the prohibited position to the permitted position due to the biasing force of the spring 413. Through the above procedure, the heads 21A and 21B of the screws 20A and 20B are exposed, and the fixed state of the actuator 510 can be released.

[0052] After the work is completed, the administrator can use the key 50 to lock the fixing unit 1 (lock 42) again. Specifically, the administrator inserts the key 50 into the key cylinder 421 and then rotates it clockwise, causing the eccentric rotor 412 to rotate clockwise together with the rotating part 411. Then, the rotation of the eccentric rotor 412 causes the shielding member 31 to slide from the permitted position to the prohibited position. Then, in this locked state, the administrator can pull out the key 50 from the key cylinder 421.

[0053] <Effects of the Invention> The fixing unit of this embodiment prevents an operator from attaching or detaching the components constituting the safety switch, but allows an administrator to easily attach or detach the components constituting the safety switch. This prevents an operator from disabling the safety switch, and makes it easy for the administrator to replace the safety switch and / or the actuator.

[0054] [Second embodiment] This embodiment differs from the first embodiment in the configuration of the movement mechanism of the restricting means and the permitting means of the fastening unit. These different configurations will be described with reference to FIGS.

[0055] As shown in FIG. 5 and FIG. 6, the fixing unit 101 of this embodiment includes a restricting means 130 and a permitting means 140. The restricting means 130 and the permitting means 140 are configured as follows.

[0056] The restricting means 130 includes a shielding member 131. The shielding member 131 moves (rotates) between a prohibited position and a permitted position in accordance with the drive of a moving mechanism 141 described later. As shown in Figs. 5(A) and 5(B), in the prohibited position, the shielding member 131 shields the heads 21A and 21B to prevent the actuator 510 from being released from its fixed state. Also, as shown in Figs. 6(A) and 6(B), in the permitted position, the shielding member 131 exposes the heads 21A and 21B to allow the actuator 510 to be released from its fixed state.

[0057] The permission means 140 includes a movement mechanism 141 and a lock 42. When the user has authority (when the user is an administrator), the movement mechanism 141 applies a force (power) to the restriction means 130 (shielding member 131) so that the stuck state can be released. The movement mechanism 141 includes a rotation unit 1411.

[0058] The rotating part 1411 is integrally formed with the key cylinder 421 of the lock 42. The rotating part 1411 rotates by turning the key 50 inserted into the key cylinder 421. The rotating part 1411 is fixed to the shielding member 131. When the rotating part 1411 rotates, the shielding member 131 also rotates.

[0059] As a result, when the administrator turns the key 50 inserted in the key cylinder 421, the shielding member 131 rotates between the prohibited position and the permitted position. Then, the shielding member 131 is locked so that it cannot be moved when it is in the prohibited position. Also, the shielding member 131 is unlocked when it is in the permitted position.

[0060] Other configurations are the same as those of the first embodiment. Furthermore, the present embodiment also provides the same effects as those of the first embodiment described above.

[0061] [Third embodiment] This embodiment differs from the above-described embodiment in the configurations of the receiving portion of the fastening unit, the screw (fastening member), the limiting means, and the enabling means. These different configurations will be described with reference to Figs.

[0062] 7 and 8, the actuator 510 is fixed to the surface of the door D by a screw 220. The fixing unit 201 includes a receiving portion 210, screws 220A and 220B (fastening members), a restricting means 230, and an enabling means 240.

[0063] The accommodating section 210 has an opening 211 formed therein, and accommodates a portion of the restricting means 230 and the permitting means 240 therein.

[0064] The housing portion 210 includes a base 212 and a cover 213 .

[0065] The base 212 has a concave shape, and mounting holes 212A and 212B (212B is not shown) are formed in the bottom surface of the concave portion. The base 212 is fixed to the surface of the door D together with the actuator 510 by screws 220A and 220B.

[0066] The cover 213 is a plate-like member that covers a portion of the upper surface of the base 212. The cover 213 is fixed to the base 212 by, for example, welding.

[0067] Screw 220A includes head 221A with a rotation input portion formed on the side surface, and threaded portion 222A with a thread groove. Screw 220A is, for example, a hexagonal bolt with head 221A having a hexagonal shape in a plan view (in the depth direction of the paper in FIG. 7(A)). Screw 220B has a similar configuration. For example, an administrator can release the stuck state of actuator 510 by fitting a wrench onto the outside of the side surfaces of heads 221A, 221B and rotating them to remove screws 220A, 220B.

[0068] The restricting means 230 includes a restricting member 231 .

[0069] The restricting member 231 has the shape of the Arabic numeral "3" in a plan view (in the depth direction of the paper in FIG. 7(A)), and includes two recesses 232A and 232B. The restricting member 231 moves (slides) between a prohibited position and a permitted position as a moving mechanism 241, which will be described later, is driven. The restricting member 231 slides between the prohibited position and the permitted position while being guided by the bottom surface of the recess in the base 212 and the lower surface of the cover 213.

[0070] The width of each of recesses 232A, 232B (the length in the vertical direction on the paper of FIG. 7(A)) should be shorter than the length of the diagonal line connecting the opposing corners of the hexagon in heads 221A, 221B of screws 220A, 220B, and larger than the distance between the opposing sides of the hexagon in heads 221A, 221B of screws 220A, 220B.

[0071] That is, if the width of each of the recesses 232A and 232B is longer than the length of a diagonal line connecting the opposing corners of the hexagon in the heads 221A and 221B, an operator may be able to turn the screws 220A and 220B to release the fixed state. Also, if the width of each of the recesses 232A and 232B is smaller than the distance between the opposing sides of the hexagon in the heads 221A and 221B, the restricting member 231 cannot move (slide) to the prohibited position.

[0072] 7(A) and 7(B), when the restricting member 231 is in the prohibited position, the head 221A (221B) of the screw 220A (220B) is accommodated in the recess 232A (232B). At this time, when the restricting member 231 is in the prohibited position, the side surface of the restricting member 231 (recess 232A, 232B) faces and is close to or in contact with at least a part of the side surface of the head 221A, 221B (a state in which an operator cannot fit a wrench around the side surface of the head 221A, 221B). This makes it impossible to release the fixed state of the actuator 510.

[0073] On the other hand, as shown in Figures 8(A) and 8(B), when the regulating member 231 is in the permitted position, the regulating member 231 is separated from the screws 220A, 220B and is in a state in which the stuck state of the actuator 510 can be released (a state in which the administrator can fit a wrench around the side of the heads 221A, 221B).

[0074] The authorization means 240 includes a moving mechanism 241 and a lock 42 .

[0075] The moving mechanism 241 includes a rotating part 2411, an eccentric rotor 2412, and a spring 2413. When the user has authority (when the user is an administrator), the moving mechanism 241 applies a force (power) to the limiting means 230 (regulating member 231) so as to release the stuck state of the actuator 510. Specifically, the moving mechanism 241 moves the restricting member 231 between the prohibited position and the permitted position.

[0076] The rotating part 2411 is formed integrally with the key cylinder 421 of the lock 42. The rotating part 2411 rotates by turning the key 50 inserted into the key cylinder 421. In conjunction with the rotation of the rotating part 2411, the eccentric rotor 2412 also rotates.

[0077] The eccentric rotor 2412 is fixed to the rotating part 2411. The eccentric rotor 2412 rotates in conjunction with the rotation of the rotating part 2411.

[0078] One end of the spring 2413 is fixed to the base 212, and the other end is fixed to the restricting member 231. The spring 2413 biases the restricting member 231 in a direction toward the inside of the housing portion 210. Due to the biasing force of the spring 2413, the restricting member 231 is always in contact with the side surface of the eccentric rotor 2412.

[0079] For example, when the eccentric rotor 2412 rotates clockwise from the position shown in Fig. 8(A) to the position shown in Fig. 7(A), the restricting member 231 slides from the permitted position to the prohibited position. When the eccentric rotor 2412 rotates counterclockwise from the position shown in Fig. 7(A) to the position shown in Fig. 8(A), the restricting member 231 slides from the prohibited position to the permitted position due to the biasing force of the spring 2413.

[0080] In this way, the restricting member 231 slides between the prohibited position and the permitted position when the administrator turns the key 50 inserted in the key cylinder 421. When the restricting member 231 is in the prohibited position, it is locked so that it cannot be moved. When the restricting member 231 is in the permitted position, it is unlocked.

[0081] The other configurations are the same as those of the above-described embodiment. Also, the present embodiment provides the same effects as those of the above-described embodiment.

[0082] [Fourth embodiment] This embodiment differs from the above-described embodiments in the configuration of the movement mechanism of the permission means. Specifically, in the fixing unit 301, two springs 3413A and 3413B are disposed between the base 312 and the shielding member 331 as shown in FIG.

[0083] Further, at both ends of base 312 (the upper and lower ends on the paper surface of FIG. 9), groove-like guides 313A and 313B are formed for moving shielding member 331 and springs 3413A and 3413B.

[0084] The blocking member 331 is always in contact with the eccentric rotor 3412 due to the biasing forces of the two springs 3413A and 3413B.

[0085] According to this invention, the guides 313A and 313B at both ends can be used as not only the movement path of the shielding member 331 but also the movement path of the springs 3413A and 3413B.

[0086] Other configurations are the same as those of the embodiment 1. Furthermore, the present embodiment also provides the same effects as those of the above-described embodiment 1.

[0087] The means for keeping the relative positional relationship between the shielding member and the eccentric rotor constant (means for keeping them at an equal distance or bringing them into contact with each other, such as spring 413 in the first embodiment and springs 3413A and 3413B in this embodiment) can employ various other configurations. For example, the shielding member and the eccentric rotor may be connected by a connecting member. In this case, one end of the connecting member may be fixed to the shielding member, and the other end of the connecting member may move on a guide rail formed in the eccentric rotor, so that the shielding member and the eccentric rotor are always in contact with each other. In this case, for example, it is preferable that the center part of the connecting member is made of an expandable and contractible material / mechanism.

[0088] [Fifth embodiment] This embodiment differs from the above-described embodiment in the configuration of the key and the restricting member. Specifically, as shown in Fig. 10, the key 50 used in the fixing unit 401 is a padlock, and the shielding member 431 is configured in a rectangular parallelepiped shape formed so as to cover the screws 20A and 20B. The actuator 410 of this embodiment is fixed to a mounting bracket installed on a door (not shown) by the screws 20A and 20B.

[0089] As shown in Fig. 10, the actuator 410 in this embodiment has an L-shape when viewed from the side (in the depth direction of the paper in Fig. 10). One end of the base end is erected toward the upper side of the paper in Fig. 10. This base end has a hole for inserting the screw 20A (20B) and a hole for inserting the shackle portion 50A (latch) of the key 50.

[0090] Shielding member 431 is a box-shaped component made up of four surface members. That is, shielding member 431 has no surface members in the portion that comes into contact with actuator 410 (the right side and lower side of the paper surface in FIG. 10).

[0091] A hole for inserting a shackle portion 50A (latch) of the key 50 is formed in a surface member of the shielding member 531 facing the tip end side of the actuator 410. The shielding member 431 is fixed to the base end of the actuator 410 by a hinge 4311. That is, the actuator 410 of this embodiment is integrated with the shielding member 431.

[0092] When an administrator wishes to release the stuck state of actuator 410, he or she can unlock key 50 and then rotate shielding member 431 upward (upper side of the paper in Figure 10) around hinge 5311 to expose screws 20A and 20B and establish an authorized state.

[0093] The other configurations are the same as those of the above-mentioned embodiment. Furthermore, the present embodiment also provides the same effects as those of the above-mentioned first embodiment.

[0094] [Sixth embodiment] As shown in FIG. 11, this embodiment is a modification of the fifth embodiment.

[0095] The shielding member 531 is a box-shaped component made up of four surface members, similar to the fifth embodiment. That is, the shielding member 531 has no surface members in the portion that contacts the actuator 510 (the right side and lower side of the paper surface in FIG. 11).

[0096] Moreover, the shielding member 531 is fixed to the base end of the actuator 510 by a mechanism of a lock 542. That is, the actuator 510 of this embodiment is integrated with the shielding member 531, similar to the fifth embodiment.

[0097] When an administrator wants to release the stuck state of actuator 510, he or she inserts key 50 and turns lock 542 to rotate shielding member 531 upward (upper side on the paper in FIG. 11), thereby exposing screws 20A and 20B and setting up the permitted state.

[0098] The other configurations are the same as those of the above-mentioned embodiment. Furthermore, the present embodiment also provides the same effects as those of the above-mentioned first embodiment.

[0099] [Other embodiments] Unlike the above embodiment, the position at which the actuator is disposed and the position at which the switch body is disposed may be opposite to those in FIG.

[0100] The present invention may also be applied to a switch body, in which case the same effects as those of the above embodiment can be obtained with respect to the switch body.

[0101] Furthermore, the shapes and configurations of the switch body and the actuator are not limited to those of the above-described embodiment. For example, the tip and base ends of the actuator may have spherical portions instead of the flat plate shapes described above. Furthermore, the tip of the actuator may not engage with the internal mechanism of the switch body. For example, the actuator may be of a non-contact RFID type.

[0102] In the first and fourth embodiments, examples are described in which a spring is provided in the fastening unit, but the spring may not be provided in these embodiments. In this case, for example, when the door is locked, the rotating eccentric rotor pushes the shielding member toward the side that covers the fastening member and places it in the prohibited position. On the other hand, when the door is unlocked, only the eccentric rotor moves and the shielding member does not move to the permitted position, but the administrator can slide the shielding member into the housing with his or her finger or the like to move it to the permitted position.

[0103] In addition to the above-described embodiment, the key may be a mechanical lock including a combination lock, an electronic lock, or a lock using biometric authentication such as RFID or fingerprint authentication. In the case of an electronic lock, it is sufficient that the lock can be locked and unlocked by driving an ON / OFF solenoid, for example.

[0104] Also, unlike the above embodiment, there may be buttons numbered 1 to 5, and the lock may be unlocked when the combination of buttons pressed is correct. For example, when 1 and 3 are pressed and a lever is pulled, the lock is unlocked and a door covering the screw opens, and when the door is closed, the lock is relocked. In other words, in this case, the user who knows the combination of numbers to unlock the lock becomes the administrator.

[0105] The lock may also be made of a special material such as resin. In this case, the lock can be set by applying a paste of resin to cover the head of the screw and then solidifying the resin, and the lock can be unlocked by removing the solidified resin with a solvent. The same effect can also be achieved by covering the head of the screw with a cap that can only be removed by the administrator, instead of resin.

[0106] Also, unlike the above embodiment, the fastening unit of the present invention may be structured to be automatically unlocked by inserting a key. In this case, for example, a user can pull a lever or the like (slide the lever closer to the screw head) to cause a slide bar to cover the screw head and lock it. Also, when an administrator inserts a key, the spring force moves the lever and slide bar away from the screw head, exposing the screw head and unlocking it.

[0107] Furthermore, the shape of the head and groove of the screw are not limited to those in the above embodiment, and various shapes can be adopted.

[0108] The housing and cover can also be made of resin, stainless steel, or the like.

[0109] Also, unlike the above embodiment, the fastening members do not have to be screws, and may be, for example, bolts and nuts.

[0110] In the above embodiment, the actuator has two mounting holes, but the present invention is not limited to this. For example, in Fig. 2, the actuator 510 may have only the mounting hole 513A, and may have a protrusion (e.g., a claw-shaped member) that can be engaged with a recess formed in the base 12 instead of the mounting hole 513B.

[0111] In this case, the user can position the actuator 510 to some extent by engaging a convex portion formed on the actuator 510 with a concave portion formed on the base 12, while inserting the screw 20A into the mounting hole 513A to fix the actuator in place. This can reduce the number of parts and material costs, and allows the user to fix the safety switch even more easily. [Explanation of symbols]

[0112] 1, 101, 201 Fixing unit 20A, 20B, 220A, 220B Screws (fastening parts) 42 tablets 50 keys 30, 130, 230 Restrictions 40, 140, 240 Permit Means 41, 141, 241 Movement mechanism (acting means) 31, 131, 331, 431, 531 Shielding material 231 Regulatory Materials 500 Safety Switch 510 Actuator 520 Switch body

Claims

1. a restricting means for restricting a fastening state of a component constituting a safety switch installed to ensure the safety of an operator within the facility, the component being fastened to a wall or a door of the facility by a fastening member, so that an unauthorized user cannot release the fastening state; a permission means for enabling a user to release the stuck state when the user has authority; Equipped with The components constituting the safety switch are a switch body and / or an actuator that can move toward and away from each other. Adhesive unit.

2. The permission means includes an action means for applying a force to the restriction means so as to bring the stuck state into a state in which the stuck state can be released when the user has authority. The fastening unit according to claim 1 .

3. the fastening member is a screw having a head for releasing the fixed state, the restricting means includes a shielding member that moves between a prohibiting position where the head is shielded so that the fixed state cannot be released and an enabling position where the head is exposed so that the fixed state can be released, the operating means is a moving mechanism that moves the shielding member between the prohibited position and the permitted position, The authorization means authenticates the presence or absence of a user's authority by a physical or electronic key; The moving mechanism moves the shielding member by the power of locking / unlocking using the key. The fastening unit according to claim 2 .

4. The fastening member is a screw having a head with a rotation input portion formed on a side surface thereof, the restriction means includes a restriction member that moves between a prohibited position where the restriction member faces at least a part of the side surface and approaches or contacts the side surface so that the fixed state cannot be released, and an allowed position where the restriction member is separated from the fastening member and can release the fixed state, the operating means is a moving mechanism that moves the regulating member to the prohibition position and the permission position, The authorization means authenticates the presence or absence of a user's authority by a physical or electronic key; The moving mechanism moves the restricting member by the power of locking / unlocking using the key. The fastening unit according to claim 2 .

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