JP2606540Y2 - Safety switch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to, for example, a door in a room or a factory where an industrial machine is installed, or a protective door provided in a danger zone of the industrial machine itself, which is turned off when the door is opened. By automatically stopping the operation of the machine or preventing the machine from operating unless the doors and guard doors are completely closed, it is possible to prevent the human body from being involved in industrial machinery in advance. The present invention relates to a safety switch device for preventing a failure.

[0002]

2. Description of the Related Art Conventionally, as a means for preventing the occurrence of an accident due to a third party erroneously turning on the power during a maintenance work on an industrial machine, for example, prior to the maintenance work on the industrial machine, Make sure that the operator removes all fuses of the bladed switch with fuse and puts them in the pocket before starting work, or locks with a key so that the maintenance worker cannot turn on the power after shutting off the power. I have.
However, in such a management method that relies on the worker's own consciousness, there is a risk that the worker may inadvertently forget and completely lose the effect.

[0003] Therefore, when a dangerous industrial machine is installed, which may be damaged by being caught in the human body, the door of an entrance or exit of a room or a factory where the machine is installed or the industrial machine itself is installed. By installing a safety switch device that automatically detects the opening and closing of the protective door of a building and turns it on and off, it is prohibited to enter a hazardous area, and as long as there is a human body in a room or factory, an industrially installed The operation of the machine is prohibited or the machine cannot be operated unless the guard door is closed.

As shown in FIG. 4, this type of safety switch device generally includes a switching actuator (2) mainly attached to a door of a room, and the switching actuator (2) is inserted and withdrawn when the door is opened and closed. And a switch body (1) mounted so as to be operated. The switch body (1) is composed of a switch section (3) and a passive operation section (4) that is operated by inserting and removing a switching actuator (2) to switch the switch section (3). In 2), the mounting substrate portion 5 is fixed to the door so as to protrude in the opening and closing direction of the door. In the switch body (1), the switching actuator (2) is inserted from one of the insertion holes (6a) and (6b) of the lid (6) of the passive operation unit (4) when the door is closed. It is fixed at a predetermined location. Here, an example is shown in which the switching actuator (2) can be inserted by selecting one of two orthogonal directions. The switching actuator (2) includes, in addition to the substrate portion (5) described above, two types and three operating pressing surfaces (7a) and (7b) having predetermined steps, and an escape hole for a cam-shaped plate described later. (8) and a return pressing surface (9) formed by a front edge of the escape hole (8) are integrally formed.

[0005] As a safety switch device of this type, the same applicant as the present application has disclosed that a switching operation is not performed by any manual operation other than an intended operation such as opening and closing of a door, and a stable operation is always performed. (Refer to Japanese Patent Application No. 4-231310). This safety switch device is connected to the lids (6), (1) shown in FIG.
FIG. 5 showing a plan view in which 0) is removed, and FIG.
This will be briefly described with reference to FIG. 6 showing a sectional view taken along line AA of FIG. 6 and FIG. 7 showing a sectional view taken along line BB of FIG.

When the switching actuator (2) is pulled out of the switch body (1) by opening the door, the switching rod (27) is biased by the return spring (32) as shown in the drawing. The switch switching member (39) is located on the front side, and the cam follower pin (29) is located at the start end of each of the guide cam holes (20), (24).

In this initial state, when the door is moved in the closing direction and the switching actuator (2) is inserted into the switch body (1), the switching actuator (2)
Of the cam-shaped plates (13), (14a), (14) held by a torsion coil spring (16) at a rotational phase difference substantially matching these steps.
After simultaneously contacting each of the operating pressure receiving portions (17) and (22) in (b), each of the cam-shaped plates (13), (14a) and (1)
4b) are rotated while maintaining the initial state with each other. Here, each cam-shaped plate (13), (14a), (14b)
Since a thrust washer (15) is interposed between them, they can rotate smoothly independently of each other. Therefore, unless a switching actuator (2) having a predetermined shape is inserted, absolute operation is impossible. Does not work.

Then, each of the cam plates (13), (14)
When a) and (14b) rotate around the support shaft (12),
The cam follower pin (29) is connected to each of the cam plates (13) and (1).
4a), (14b) Guide cam holes (20), (2)
4), and the pin guide plate (2)
6) The guide rod (26b) guides the guide rod (26b) to move rearward, and the switch rod (27) integrally provided with the cam follower pin (29) and the switch switching member (29) connected thereto are moved rearward. The movable contact plate (4
The normally closed movable contact (not shown) of 2) is separated from the normally closed fixed contact (not shown) of the normally closed fixed contact plate (36).

As the switching actuator (2) is further inserted, the normally open movable contact (not shown) of the normally open movable contact plate (44) is normally opened of the normally open fixed contact plate (38). The switch (3) is switched by being pressed against the side fixed contact (not shown) by the urging force of the contact pressure spring (45). At this time, a part of each of the cam plates (13), (14a) and (14b) enters the escape hole (8) of the switching actuator (2), and each of the cam plates (13) and (14a). , (14
Since the return pressing surface (9) of the switching actuator (2) faces the return pressure receiving portions (18) and (13) of (b), the normally open movable side is assumed when the door is opened next time. Even if the contact is welded to the normally-open-side fixed contact (37), the cam-shaped plates (13), (14a) and (14b) are forcibly rotated.

Incidentally, the other configuration will be briefly described.
The switching rod body (2) is provided on the central driving cam plate (13).
The operation relief portion (19) of (7) is formed, and the rubber bellows (30) waterproofs the space between the spring receiving disk portion (27a) of the switching rod body (27) and the switch case (28). A spring tray (31) for a return spring (32) is provided outside the rubber bellows (30). A normally-closed movable contact plate (42) having a pair of normally-closed movable contacts at both ends; a normally-opened movable contact plate (44) having a pair of normally-opened movable contacts (43) at both ends; Is inserted in a state facing the holding hole (40) of the switch switching member (39), and the contact pressure spring (4) is provided between the contact plates (42) and (44).
5) is interposed. Further, the connecting engagement portion (27b) at the rear end of the switching rod body (27) and the switch switching member (3
The switching rod body (2) is formed by the engagement portion (46) at the front end of 9).
7) and the switch switching member (39) are connected, and the block case (34) of the contact block (3) is covered with a case lid (47). The case lid (47) allows the switch switching member (39) to be closed. Are held so that they can move smoothly in the front-rear direction.

[0011]

The above-described safety switch device does not perform a switching operation by any manual operation other than a target operation to be detected, such as opening and closing a door, and always operates stably. However, there is still a problem that the configuration is complicated, the cost is increased, and the overall shape is enlarged. That is, since the switch body (1) constituting the outer body of the passive operation part (4) and the switch case part (28) of the switch part (3) are formed of metal, the required parts of the switch part (3) are required. In order to obtain electrical insulation, a contact block (33) having a synthetic resin block case (34) as an outer body is configured as a separate unit, and this contact block (33) is connected to a switch of the switch body (1). It is configured to be incorporated in the case (28). As a result, the switching rod (27) on the passive operation part (4) side and the contact block (33) on the switch part (3) serve as moving members in the front-rear direction by inserting and removing the switching actuator (2). The switch switching member (39) is connected when these are assembled. Since the number of components is large, the cost increases.

The switching rod (2) is used as a moving member.
7) and the switch switching member (39), it is necessary to provide a connecting engaging portion (27b) and an engaging portion (46) for connecting these members to each other, so that the total length is reduced. become longer. Further, a substantially U-shaped pin guide plate (26) having a pair of support plates (26a) on both sides for slidably supporting the cam follower pin (29) is provided on the passive operation unit (4). Therefore, the width dimension also becomes large.
As a result, the overall shape becomes large.

SUMMARY OF THE INVENTION Accordingly, it is a technical object of the present invention to provide a safety switch device having a configuration in which the configuration can be simplified to reduce the number of parts and the overall shape can be significantly reduced.

[0014]

SUMMARY OF THE INVENTION According to the present invention, a moving member is linearly moved in the front-rear direction by inserting and removing a switching actuator attached to a door or the like from a passive operating portion at a front portion of a switch body. In a safety switch device in which a switch portion is switched, a main body case of the switch main body is formed by integrating an outer body portion of the passive operation portion, a switch case portion of the switch portion, and a contact case portion in the switch case portion with synthetic resin. A switching operation rod body as a moving member having a molded shape and holding a movable contact plate at a rear end portion, a central portion thereof is inserted into the switch case portion, and a front end portion is rotated by inserting and removing the switching actuator. And a rear end of the movable contact plate contacts and separates the movable contact of the movable contact plate from the fixed contact. A guide hole is slidably held in the contact case portion so as to face each other, and guide holes for holding both ends of the cam follower pin movably in the front-rear direction are formed on both side surfaces of the passive operation portion in the main body case. It is characterized by having established.

[0015]

[0016]

The main body case is made of synthetic resin, and the contact case portion corresponding to the block case (34) of the conventional contact block is integrally formed in the switch case portion of the main body case. No contact block is required. Further, the switching operation rod body as a moving member in the front-rear direction interlocking with the insertion / removal of the switching actuator is formed by integrating the conventional switching rod body and the switch switching member into a connected state, so that the above-mentioned contact is achieved. In addition to eliminating the need for blocks, the number of parts can be reduced and costs can be significantly reduced. If guide holes for holding the cam follower pins slidably in the front-rear direction are formed on both side surfaces of the main body case, the conventional pin guide plate becomes unnecessary, and the number of parts can be further reduced.

Further, since a single switching operation rod is used as the moving member, there is no need to connect two members, the switching rod and the switch switching member, as in the prior art.
The overall length in the front-rear direction is significantly shorter. Further, if guide holes are formed on both side surfaces of the main body case, a conventional pin guide plate is not required, so that the width is reduced. Therefore, the overall shape can be considerably reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of the embodiment of the present invention with the lid removed, FIG. 2 is a longitudinal sectional view at the center, and FIG. 3 is a partially cutaway right side view, and FIGS. The same or substantially the same components as those in 7 are denoted by the same reference numerals in order to simplify the description and facilitate understanding, and a description thereof will be omitted.

Next, only configurations different from those in FIGS. 4 to 7 will be described. The external body part of the passive operation part (4) and the switch case part (58) of the switch part (3), and the block case (34) of the conventional contact block (33).
And a contact case part (52) corresponding to the above is integrally formed as a main body case (48) with synthetic resin. Further, as clearly shown in FIG. 2, the conventional switching rod body (2
A switching operation rod body (49) having a shape in which the switch operation member (39) and the switch operation member (39) are integrated into a connected state allows the central portion to pass through the play insertion hole (59) of the switch case portion (58), A front end is connected to each of the cams (13), (14a) and (14b) via a cam follower pin (29), and a rear end is slidably housed in a contact case (52). It is held by the lid (53). Here, as is clear from the comparison between FIG. 2 and FIG.
Conventionally, in order to slidably support a rear end of a switching rod body (27) whose front end is supported by a cam follower pin (29), a switching rod body (2) is attached to a switch case (28).
7) It is necessary to form a fitting hole for slidably holding the rear end portion, but the switching operation rod body (49) of the present invention.
Since the rear end portion is slidably held in a sandwiched state by the contact case portion (52) and the case lid (53), the switch case portion (58) includes a return spring (3).
The loose insertion hole (59) of the switching operation rod (49) can be formed with a hole diameter slightly smaller than the diameter of 2), that is, a hole diameter much larger than the cross-sectional area of the switching operation rod (49). Therefore, the work of penetrating the integrated switching operation rod body (49) through the switch case portion (58) can be performed without any trouble.

Further, as clearly shown in FIGS. 1 and 3,
A pair of support holes (50) for rotatably supporting both ends of the support shaft (12) and a cam follower pin (29) are provided on both side surfaces of the passive operation portion (4) of the main body case (48).
And a pair of elongated hole-shaped guide holes (51) for slidably holding the opposite ends in the front-rear direction. In this embodiment, an indicator light (54) made of an LED and an indicator light (5) are provided at the upper end of a case cover (53) for covering the contact case portion (52) in the main body case (48).
4) is provided with a terminal plate (56) provided with a terminal screw (55) for supplying power, and is opposed to the indicator light (54) on the lid (10) of the switch section (3). A configuration is shown in which a lens (57) is fitted at a position where the lens (57) is inserted. Configurations other than those described above are substantially the same as those in FIGS.

As described above, the main body case (48) is made of a synthetic resin, and the switch case (58) of the main body case (48) is provided in the block case (34) of the conventional contact block (33). Since the contact case portion (52) corresponding to (1) is integrally formed, the conventional contact block (33) as a separate member is not required. Further, a switching operation rod body (4) as a moving member in the front-rear direction interlocked with the insertion and removal of the switching actuator (2).
9) is formed by integrating the conventional switching rod body (27) and the switch switching member (39) into a connected state, thereby reducing the number of parts. Furthermore, the body case (4
8) A guide hole (51) for holding the cam follower pin (29) slidably in the front-rear direction is formed on both side surfaces of (8).
The conventional pin guide plate (26) becomes unnecessary. as a result,
The number of parts can be considerably reduced, and the cost can be greatly reduced.

Since the integrated switching rod (49) is used as the moving member, the connecting means between the switching rod (27) and the switch switching member (39) as in the prior art is not required. As is clear from a comparison between FIG. 2 and FIG. 7, the overall length in the front-rear direction is significantly reduced. In addition, since the conventional support stand (11) and pin guide plate (26) are not required, the lateral width is reduced. Therefore, the overall shape can be considerably reduced.

[0023]

As described above, according to the safety switch device of the present invention, the main body case is made of synthetic resin,
Since the contact case portion is integrally formed in the switch case portion of the main body case, the conventional contact block as a separate member is not required. Further, since a single switching operation rod body is provided as a moving member in the front-rear direction that is interlocked with the insertion and removal of the switching actuator, it is compared with a conventional configuration in which two members, a switching rod body and a switch switching member, are provided. Therefore, the number of parts can be reduced, and the cost can be significantly reduced.

Further, if guide holes for holding the cam follower pins slidably in the front-rear direction are formed on both side surfaces of the main body case, a conventional pin guide plate becomes unnecessary and the number of parts can be further reduced.

Since a single switching operation rod body is used as the moving member, there is no need for a connecting means for connecting the switching rod body and the switch switching member as in the related art.
The overall length in the front-rear direction is significantly shorter. Further, if guide holes are formed on both side surfaces of the main body case, a conventional pin guide plate is not required, so that the width is reduced. Therefore, the overall shape can be considerably reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a preferred embodiment of the present invention with a lid removed.

FIG. 2 is a right side view of the same, cut at the center.

FIG. 3 is a right side view, partially broken away, of the same.

FIG. 4 is a perspective view of a safety switch device of the same type as the present invention.

FIG. 5 is a plan view of the conventional device with a lid removed.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch main body 2 Switching actuator 3 Switch part 4 Passive operation part 12 Support shaft 13, 14a, 14b Cam-shaped plate 29 Cam follower pin 42, 44 Movable contact plate 48 Body case 49 Switching operation rod body 50 Support hole 51 Guide hole 52 Contact Case 58 Switch case

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 3/16 H01H 27/00 H01H 9/22 H01H 9/28

Claims (1)

(57) [Scope of request for utility model registration] 1. A safety switch in which a switching actuator attached to a door or the like is inserted into or removed from a passive operation unit at a front part of a switch body, whereby a moving member is linearly moved in the front-rear direction and a rear switch part is switched. In the device, the main body case of the switch main body has a shape in which an outer body part of the passive operation part, a switch case part of the switch part, and a contact case part in the switch case part are integrally formed of synthetic resin, and a rear end part is provided. The switching operation rod body as the moving member holding the movable contact plate is provided with a cam follower pin on a cam-shaped plate whose central portion is inserted into the switch case portion and whose front end rotates by inserting and removing the switching actuator. The movable contact of the movable contact plate is opposed to the fixed contact so that the movable contact comes into contact with and separates from the fixed contact. Slidably held in the case
And the passive operation in the main body case
At both sides of the part, the both ends of the cam follower pin
A safety switch device, wherein a guide hole for movably holding the guide hole is formed .