JP2003185092A - Releasing mechanism for safety device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a releasing mechanism for a safety device, which allows operation of equipment even in a state where a door is opened, in which an operating condition of the safety device can easily be recognized, and which is inexpensive and highly reliable. <P>SOLUTION: The safety device comprises: a limit switch 16 for switching from/to conduction to/from non-conduction to a switching circuit 14 by moving a switch member 12; and a pushing member 18 for moving the switch member in a direction of conduction to the switching circuit when the door is completely closed. The safety device is released by an abutting member 24 moving the switch member to perform the conduction to the switching circuit and having a projecting portion 22 brought into abutment on the door to prevent the door from completely closed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device releasing mechanism, and more particularly to a mechanism for attaching a safety device to a door frame of a laboratory, for operating laboratory equipment only when the door is completely closed. The present invention relates to a safety device release mechanism for forcibly releasing a safety device provided so as to ensure a certain level of safety.

[0002]

2. Description of the Related Art In a laboratory or the like having a door that can be opened and closed, it is possible to prevent inadvertent entry of foreign matter through the opening of the door,
In addition, from the viewpoint of ensuring the safety of workers, a safety device is often provided to prevent the operation of equipment in the laboratory when the door is open.

FIG. 3 shows a structure of a safety device including a limit switch attached to a door frame portion. Here, FIG. 3 (a)
Shows a state before the door is completely closed, and FIG. 3B shows a state after the door is completely closed by a cross-sectional view.

The safety device (50) includes a pushing material (53) provided on a door (51), a limit switch (59) provided with a switch material (57) provided on a door frame (55), It consists of and. In addition, the limit switch is connected to a determination circuit (63) that manages ON / OFF signals from the limit switch (that is, signals that indicate the open / closed state of the door) and controls the power supply / interruption to the experimental equipment (61). Has been done.

In the safety device (50) shown in FIG. 3, when the door (51) is completely closed, the pushing material (53) attached to the door pushes down the switch material (57) to connect the switching circuit (64). Energize with. Next, from the energized switching circuit (64) to the determination circuit (63)
An ON signal (closed signal) is sent to, and the determination circuit that receives the ON signal connects the main power source (65) and the experimental equipment (61) to supply power to the experimental equipment. On the other hand, when the door is opened, the pushing material does not push down the switch material, the switching circuit is cut off, and an OFF signal (open signal) is sent to the determination circuit. The determination circuit that receives the OFF signal interrupts the supply of power from the main power source to the experimental equipment.

That is, the experimental equipment (61) has a door (5
1) is in a state in which it can be operated only when it is completely closed, and when the door is opened, it is impossible to operate as a result of no power being supplied.

Further, in addition to the above-mentioned safety device, a lock device (not shown) is provided on the door, and the lock device is often operated to prohibit the door from being opened during the operation of the device.

[0008]

The above-mentioned safety device is important from the viewpoint of ensuring safety when operating the equipment, but the equipment cannot be operated unless the door is closed. For example, even when it is necessary to operate the device with the door open for the purpose of maintenance work, etc., the operation cannot be performed. Therefore, for some reason, when it is necessary to operate the device in the laboratory with the door open, power is supplied to the device by operating the determination circuit.

However, when such a judgment circuit is operated, there is a possibility that the judgment circuit may be forgotten to return to its original state after that. If the user forgets to return it, power will always be supplied to the device regardless of whether the door is open or closed.
There was also some kind of accident.

In order to prevent such an accident and ensure safety, there is also a means for providing a separate electrical restoration circuit for restoration of the judgment circuit. However, such means would complicate the apparatus and increase the manufacturing cost. At the same time, it is possible that the recovery circuit itself will malfunction. In addition, even if there is such a problem, it is not easy to grasp the operating status of the safety device, so that there is a problem that safety cannot be sufficiently ensured.

The present invention has been made to solve such a problem. That is, the present invention enables a temporary operation of the device with the door opened by a simple mechanical structure, and easily recognizes the operating state of the safety device without using electrical means. It is an object of the present invention to provide a low-cost and highly reliable safety device releasing mechanism that can perform

[0012]

In order to solve the above problems, the present invention relates to a safety device for controlling the supply of electric power to a device (2) housed in a room by controlling the opening and closing of a door (4). The release device is a release mechanism, and the safety device (6) completely closes a door and a limit switch (16) that switches between energization and de-energization of a switching circuit (14) by moving a switch material (12). In this case, a pusher material (18) for moving the switch material in a direction of energizing the switching circuit, and the release mechanism (10).
Is a protrusion (2) that prevents the door from being completely closed by moving the switch material to energize the switching circuit and contact the door even when the door is open.
A mechanism for releasing a safety device is provided, which comprises an abutment member (24) having (2).

In the safety device releasing mechanism of the present invention, a safety device for prohibiting the operation of the device when the door leading to the space where the device is housed is not completely closed is forced from the necessity of maintenance work of the device. It is used for canceling. This release mechanism energizes the switching circuit in the same way as when the door is completely closed using the contact material,
At the same time that the safety device is forcibly released, the protrusion provided on the contact member prevents the door from being completely closed.

By thus preventing the door from being completely closed when the safety device is released, if the release mechanism of the safety device of the present invention is forgotten to be released and normal equipment is operated, Can easily recognize that the release mechanism of the safety device remains activated because the operator of the device cannot completely close the door, and can easily cope with this.

As described above, the release mechanism of the safety device of the present invention energizes the switching circuit by using mechanical means instead of electrical means, and an ON signal (indicative of a state in which the door is pseudo closed). At the same time that the closing signal) is generated, the recognition of the operating condition can be judged by whether or not the door is closed. Therefore, its reliability is high,
Its main feature is that it can be implemented inexpensively with a simple structure.

Here, the contact member (24) is slidably installed so as to move the switch member (12) in a direction in which the switching circuit (14) is energized,
It is preferable that the door (4) is provided with an avoidance mechanism (26) for preventing the protrusion (22) from coming into contact with the door when the contact member is not slidingly moved.

In order to configure the release mechanism of the safety device, for example, a separately prepared block-shaped member is used, and by manually inserting the block member into which the limit switch is attached and fitting the switch member, switching is performed. It is possible to energize the circuit and prevent the door from being closed by this member. However, such a configuration is not always preferable because it causes a problem such as loss of the block-shaped member. Therefore, an abutting member is attached to the door frame portion, and it is mainly manually guided so as to be slidable, and the switching member is moved by the sliding abutting member to energize the switching circuit. Further, the slidably moved contact member prohibits the door from completely closing by contacting the door. When the release mechanism of the safety device of the present invention is not activated, the door is provided with an avoidance mechanism so that the contact member does not affect the opening and closing of the door.

Here, the avoidance mechanism (26) is preferably a recess (28) for accommodating the protrusion (22) when the door (4) is closed.

When the release mechanism of the safety device of the present invention is not operating, it is necessary that the projection provided on the contact member does not prevent the door from closing. Therefore, when the release mechanism of the safety device is not operated, a recess for accommodating the protrusion is formed so that the door can be completely closed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the common part is denoted by the same reference numeral, and the duplicated description will be omitted.

In this embodiment, a release mechanism for forcibly releasing the safety device attached to the door frame or the like of each laboratory in which the experimental equipment of the space experiment facility is stored is assumed. Most of the experiments in the space experiment facility are performed in a zero-gravity state, so if the laboratory door is open,
During the experiment, foreign matter may inadvertently intrude through the door opening to prevent the experiment from being performed, and the subject of the experiment may jump out of the laboratory to injure the operator. Therefore, in order to prevent such a situation from occurring, the door of the laboratory of the space experiment facility is equipped with a safety device that makes it impossible to operate the equipment in the laboratory in the open state.

FIG. 1 schematically shows a laboratory door and a door frame. The opening provided on the wall surface is framed by a door frame 8, and the door frame 8 is attached with a door that can be opened and closed by a hinge 42. The door 4 is closed by overlapping a part of a door frame 8 and an outer edge portion of the door as shown by a broken line. In addition, 44 is a latch for opening and closing the door, and 46 is an extension bar.

A safety device 6 and a release mechanism 10 for the safety device of this embodiment are provided at positions where the door and the door frame overlap each other and are shown by being surrounded by a circle. The configuration and operation of this safety device and the release mechanism of the safety device of the present embodiment will be described below with reference to FIG. 2, which is a sectional view taken along line XX of FIG.

The safety device 6 itself provided on the door 4 of the laboratory is the same as that conventionally used,
It is composed of a pushing material 18 provided on the upper portion of the outer edge of the door 4 and a limit switch 16 provided on the door frame 8 and provided with a switch material 12 made of a leaf spring.

As shown in FIG. 2A, when the door 4 is opened, the switch material 12 is located at a position separated from the switch protrusion 20 by a certain minute space. On the other hand, when the door is completely closed, the pushing material 18 attached to the door pushes the switch material 12, and the switch material is deformed to push down the switch protrusion 20 to energize the switching circuit 14 (see FIG. 2B). ). When the door is opened again and the pushing material separates from the switch material 12, the switch material, which is a leaf spring, returns to its original shape, and the switch protrusion 20 projects to cut off the energization of the switching circuit.

The switching circuit 14 is connected to a determination circuit 17 which controls the supply of electric power from the main power source 15 to the experimental equipment 2. ON when the switching circuit 14 is energized
A signal (a signal indicating that the door is completely closed) is sent to the determination circuit 17, and the determination circuit connects the main power supply 15 and the experimental equipment 2 to supply electric power. For the first time at this stage, the operator can operate the experimental equipment in the laboratory by operating the operation panel (not shown) provided outside the laboratory.

On the other hand, the door is opened and the switching circuit 1 is opened.
When the signal No. 4 is cut off, an OFF signal (a signal notifying that the door is opened) is sent to the determination circuit 17 and the power supply to the experimental equipment 2 is interrupted.

As described above, the safety device in the normal operation of the experimental equipment 2 detects the open / closed state of the door 4 depending on whether or not the switch material 12 (and the switch protrusion 20) is pushed by the pushing material 18 attached to the door 4. The power supply to the experimental equipment 2 is controlled based on the information.

The release mechanism 10 of the safety device of this embodiment is
In order to forcibly release the safety device 6 having the above-described structure, the contact member 24 is slidably attached to a position adjacent to the limit switch 16 of the door frame 8 along the door frame within a certain range in the left-right direction. Mainly composed.

The contact member 24 is composed of a brim-shaped flat plate portion 34 which is formed parallel to the surface of the door frame and slides in the left-right direction, and a projection portion 22 which serves as a knob for manually sliding the flat plate portion. It is formed integrally. The contact member 24 is supported by the support member 36 and does not fall off the door frame portion. Further, the protrusion 22 projects from the door frame 8 toward the door.

In a state where the release mechanism of the safety device is not in operation, the door 4 corresponding to the position where the protruding portion 22 projects.
A concave portion 28 is formed on the surface of the concave portion 28, and when the door is closed, the protrusion 22 is housed in the concave portion 28 and does not prevent the door from being completely closed (see FIG. 2B).

When the release mechanism of the safety device is operated, the contact member 24 is slid to the right by gripping the projection 22, and the flat plate portion 34 of the contact member 24 causes the switch member 1 to move.
By pushing down 2, the switch protrusion 20 is pushed in to energize the switching circuit 14 (see FIG. 2C). When the switching circuit is energized, the determination circuit 17 receives O
When the N signal is sent, the determination circuit 17 determines that the door is closed and connects the main power source 15 and the experimental equipment 2 to energize them.

When the release mechanism 10 of the safety device is operating, that is, when the contact member 24 is slid, the door at the position corresponding to the protrusion 22 has no recessed portion, and the door 4 Even if the user tries to close the door, the projection 22 comes into contact with the door and the door cannot be closed completely (see FIG. 2).
(See (c)). Therefore, even if the safety device is released by using the release mechanism of the safety device for maintenance work, and if the operator forgets to release the safety device, the operator who will use the experimental equipment next, Since it does not close completely, it is possible to easily recognize that the release mechanism of this safety device is operating and release it.

On the other hand, when the contact member 24 is returned to the left, the flat plate portion 34 separates from the switch material 12, and the switch material 12 separates from the switch protrusion 20 to return to the original shape. As a result, the energization of the switching circuit 14 is cut off, and the operation of the release mechanism of the safety device is released. In this state, the protrusion 22 fits in the recess of the door, so that the door can be completely closed.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0036]

According to the present invention, by forcibly releasing the safety device provided on the door, it becomes possible to operate the equipment with the door open, and the operator operates the safety device. (EN) Provided is an inexpensive and highly reliable safety device releasing mechanism having a simple mechanical structure capable of easily recognizing a situation.

[Brief description of drawings]

FIG. 1 is a schematic view of a door to which a release mechanism of a safety device of the present invention is attached.

FIG. 2 is a sectional view taken along line XX of FIG. 1, and is a configuration diagram of a release mechanism of the safety device of the present invention.

FIG. 3 is a configuration diagram of a conventional safety device.

[Explanation of symbols]

2 equipment 4 doors 6 safety device 8 door frames 10 Release mechanism 12 switch material 14 Switching circuit 15 Main power supply 16 limit switch 17 Judgment circuit 18 Pushing material 20 switch protrusion 22 Projection 24 Abutment material 26 Avoidance mechanism 28 recess 34 Flat plate 36 Support material 42 Hinge 44 Latch 46 Extension bar 50 safety device 51 door 53 Pushing material 55 door frame 57 switch material 59 Limit switch 61 equipment 63 Judgment circuit 64 switching circuit 65 Main power supply

Claims (3)

[Claims] 1. A safety device releasing mechanism for controlling supply of electric power to a device (2) housed in a room by controlling opening and closing of a door (4), the safety device (6) comprising: A limit switch (16) that switches between energization and de-energization of the switching circuit (14) by moving the switch material (12), and moves the switch material in a direction to energize the switching circuit when the door is completely closed. The releasing mechanism (10) is configured to move the switch material to energize the switching circuit even when the door is open so that the door is completely closed by contact with the door. A release mechanism for a safety device, which comprises an abutment member (24) having a protrusion (22) for hindering the safety. 2. The abutment member (24) is slidably installed so as to move the switch member (12) in a direction of energizing the switching circuit (14), and the abutment member (24) is attached to the door (4). The avoiding mechanism (26) for preventing the protrusion (22) from coming into contact with the door when the contact member is not slidingly moved is provided.
The release mechanism of the safety device described in. 3. The recess (28) of the avoidance mechanism (26) receives the protrusion (22) when the door (4) is closed.
The release mechanism for the safety device according to claim 2, wherein: