JP2564371Y2 - 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 by preventing the machine from operating unless the doors and guard doors are completely closed, it is possible to prevent the human body from being caught in the industrial machine 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 caused by a third party erroneously turning on the power during a maintenance operation of an industrial machine, for example, in Europe, a maintenance operation of an industrial machine is performed. In the United States, workers must remove all fuses from the fuse-edged switchgear and place them in their pockets before starting work. The key is locked, and a management method for ensuring the security of such maintenance work is legally required. However, in such a management method that relies on the awareness of the worker himself, there is a risk that the worker may inadvertently forget and lose the effect.

[0003] Therefore, when a dangerous industrial machine is installed, which may be damaged by the human body being caught in it, 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 It is preferable that the operation of the machine is prohibited or the machine is not operated unless the guard door is closed. As a conventional safety switch device used for such a purpose, a switching actuator mounted on a door or the like is inserted into a switch body when the door is closed to correct a cam-shaped plate of an internal passive operation unit. By rotating the cam-shaped plate, the operation rod body is linearly moved rearward by the rotation of the cam-shaped plate, and the contact holder of the switch unit disposed behind the switch body is moved integrally with the operation rod body and the switch unit is switched. On the other hand, when the door is opened, the cam-shaped plate is reversed by the switching actuator which moves in the pulling-out direction from the switch main body, so that the contact holder is moved via the operating rod body and the switch portion is returned to the original state. There is one that is configured to switch to.

[0004]

By the way, this kind of safety switch device operates by closing a power supply circuit to an industrial machine installed inside by closing a door and switching a switch portion of a switch body. In general, wiring is performed so that when the door is opened in the operating state of the industrial machine, the operation of the industrial machine is automatically stopped. A lock mechanism that mechanically locks the switching actuator so as to automatically prevent the switching actuator from moving out of the switch body when the switching section is switched by inserting the switching actuator into the switch body. For example, the solenoid is operated by a detection signal of the stoppage of the industrial machine, and the lock by the lock mechanism is mechanically released, so that the door can be opened.

However, from the outside of the room where the industrial machine is installed, it may not be possible to determine whether or not the industrial machine is in a state in which it is possible to stop and open the door. In some cases, the door may be opened to stop the operation of the industrial machine unnecessarily. Further, in a device having a lock mechanism, the operation of opening the door may be repeated without knowing that the door is in a locked state where the door cannot be opened due to the mechanical lock state by the lock mechanism.
In order to prevent such inconvenience, there is a safety switch device having a switch body provided with a display means for displaying that the door is open.

However, in a conventional safety switch device provided with such a display means, an indicator light is attached to a position above the switch portion in a cover of the switch body, and power is supplied to the indicator light by a lead wire inside the switch body. The switch body requires a space for wiring to the indicator light in the switch section, which increases the size of the switch body, and the complicated wiring increases the number of parts and increases the cost. There are drawbacks. In addition, since wiring is performed on the inner surface side of the lid for the indicator light, wiring cannot be performed with the lid completely removed, and there is a disadvantage that workability is extremely poor. As a result, the number of man-hours increases and the cost further increases.

Therefore, the present invention reduces the number of parts without using a large space and using existing members.
An object of the present invention is to provide a safety switch device having a display means that can be easily assembled with good workability.

[0008]

A safety switch device according to the present invention is a switch device which is turned on / off by opening and closing a door, and includes a switching actuator mounted on a door, and an insertion or removal of the switching actuator. The switch body is configured such that the built-in passive operation section operates by being detached to switch the switch section, and the switch case of the switch section has a structure including a contact holder holding a movable contact and a fixed contact. A contact block unit configured to move the movable contact in a direction approaching or moving away from the fixed contact by moving the contact holder, the contact block being disposed in a state of being connected to the passive operation unit; On the upper surface of the unit cover of the contact block unit, an indicator light and power supply wiring for the indicator light are provided. And terminal plate are disposed, and a case lid of the switch case is characterized by the lens is provided at a position corresponding to the indicator.

[0009]

The display means is provided with an indicator light and a terminal plate provided with a power supply wiring for the indicator light on an upper surface of the contact block unit using a unit cover of the existing switch unit. Since the lens is arranged at a position corresponding to the indicator light on the case cover of the switch case of the main body, the existing members of the case cover of the switch case and the unit cover of the contact block unit are disposed between the two members. Since the existing space is used, a large space is not required, and no special parts for wiring are required, so that the number of parts can be reduced. In addition, the unit cover of the contact block unit can be removed and required members can be attached in advance to the upper surface of the unit cover. Wiring to the power supply circuit after the contact block unit is mounted in the switch case, and the case cover of the switch case can be removed. Since the work can be performed in a completely removed state, the workability is extremely good and the manufacture is easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 5 show one embodiment of the present invention. FIG. 1 shows a switch body (1) of a switch body (1) having a cover (5) of a passive operation unit (4) described later and a switch case (3) of a switch unit (3). 17) Case lid (38)
2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. In these drawings, as shown in FIG. 1, the present apparatus is composed of a switch body (1) having a rectangular box shape and a switching actuator (2) having a flat plate key shape as a whole. The switch body (1) has a switch section (3) disposed rearward (upward in FIG. 1) and a passive section that is operated by inserting and removing a switching actuator (2) to switch the switch section (3). An operation unit (4). The switching actuator (2) is fixed to a movable member, for example, a door by a screw so as to protrude in the door opening and closing direction. On the other hand, in the switch body (1), when the door is closed, the switching actuator (2) has any of the insertion holes (5a), (5b) shown in FIG. 3 in the lid (5) of the passive operation section (4). ) Is fixedly installed at a predetermined position so as to be inserted. In this embodiment, an example is shown in which the switching actuator (2) can be selectively inserted in any one of two orthogonal directions, and the switching actuator (2) can be inserted in the orthogonal direction of the cover (5) of the passive operation unit (4). Slotted insertion holes (5a) and (5b) are formed in the surface.

As shown in FIG. 1, the switching actuator (2) is projected in parallel at a predetermined interval from a substrate (not shown) for screwing to a door or the like, and is pressed toward each end facing surface. A pair of operating pieces (6) each having a slope portion (6a) formed therein and an operating rod (7) provided between the two operating pieces (6) so as to extend orthogonally thereto.

Next, the outline of the switch body (1) will be described with reference to FIGS. First, as shown in FIG. 1, the passive operating portion (4) is provided with a pair of cams of the same shape on a support shaft (9) provided between a pair of support bases (8) provided on both right and left sides. A plate (10) is rotatably and slidably inserted therethrough. The two cam-shaped plates (10) are urged in a direction away from each other by a compression spring (11) interposed therebetween to abut a pair of support plates (15a) of a pin guide body (15) described later. Touched.

A pair of cam-shaped plates (10) of the same shape are
As clearly shown in FIGS. 2 and 3, two insertion holes (5
a), two opposite notches (12) of the same shape formed corresponding to (5b) are opposed to one side of the operation receiving surface (1).
2a) and the other side is a return receiving surface (12b). A guide cam hole (13) is formed at a location opposite to the notches (12), and a pair of locking projections () are provided at both sides of the starting end of the guide cam hole (13). 14) is protruded.

A pin guide body (15) fixed to the rear portion of each cam-shaped plate (10) is bent into a front U-shape and has a slot-shaped guide notch (15b) on each side. One supporting plate (15a) is provided upright, and a pair of locking members of each cam-shaped plate (10) urged by a compression spring (11) on each opposing surface of each supporting plate (15a). The portions between the projections (14) are in contact with each other, whereby each cam-shaped plate (10) is prevented from rotating. The operating rod body (16) provided with the spring receiving disk portion (16a) at a substantially central portion has a rear end portion slidably penetrated and held by the switch case (17) of the switch portion (3). At the same time, both ends of the cam follower pin (16b) fixed to the front end in an orthogonal state are inserted through the guide cam holes (13) of the cam-shaped plate (10), and each end is provided with a guide notch (15b). Is slidably engaged with
The support plate (15a) and the switch case (17) are stably supported slidably in the front-rear direction by two-point support. An L-shaped hook-shaped coupling engaging portion (16c) is formed to protrude rearward from the lower rear end of the operation rod body (16). The portion of the operation rod body (16) between the spring receiving disk portion (16a) and the switch case (17) is covered with a rubber bellows (18) to be waterproof, and the operation rod is returned by a return spring (19). Since the body (16) is urged forward, the cam follower pin (16b) is normally engaged with the start end of the guide cam hole (13) as shown in FIGS. 2 and 3, respectively.

Next, the switch section (3) has a structure in which a contact block unit (20) is housed in a switch case (17). FIGS. 4 and 5 show the contact block unit (20), respectively. A cut right side view and a cut back view are shown. In the contact block unit (20), a pair of terminal plates (23) each having a normally closed fixed contact (22) is fitted on each of the front, rear, left and right sides in a unit case (21), and the rear end portion is left and right. On both sides,
Terminal plates (2) each having a normally open fixed contact (24)
5) is fitted, and the contact holder (2) is inserted into a recess formed in the front-rear direction at the center of the unit case (21).
6) is movably inserted and held. A holding hole (27) is formed in the center of the contact holder (26).
The holding hole (27) is provided with a pair of normally-closed movable contacts (28).
A normally-closed contact plate (29) provided at both ends and a normally-opened contact plate (31) provided with a pair of normally-open movable contacts (30) at both ends face each other. A contact pressure spring (32) is interposed between the two contact plates (29) and (31) to urge them apart from each other. Further, the operating rod body (16) is engaged with the coupling engaging portion (16c) of the operating rod body (16) from above on the upper front end of the contact holder (26) projecting from the unit case (21). An inverted L-shaped hook-shaped engaging portion (33) is connected to move integrally. As shown in FIGS. 3 and 5, the contact holder (26) is constantly urged forward by a return spring (34) interposed between the contact holder (26) and the unit case (21). Thus, the normally closed movable contact (28) is normally pressed against the normally closed fixed contact (22). The terminal plates (23) and (25) on the fixed side are respectively connected to terminal screws (35) and (36) screwed to them.
And is inserted and connected to a power supply circuit of an industrial machine or the like to be operated and controlled.

The above-described structure of the contact block unit (20) is substantially the same as the existing structure except that the contact holder (26) is detachably connected to the operating rod body (16) as a separate body. , The shape of the switch case (17) is also substantially the same as that of the existing switch case.
The configuration of the display means as the gist of the present invention will be described.
That is, the gist of the present invention is that the unit cover (3) for covering the upper opening of the unit case (21) and for movably holding the contact holder (26) without removing the contact holder (26).
7) The shape of the switch case (17)
That is, a lens (39) is provided at an appropriate position of a case lid (38) for covering the upper opening of the lens. Unit lid (37)
A cylindrical support (40) is provided at the center of the rear end side of the upper surface of the
An indicator light (41) made of an LED is fitted to the upper end of the cylindrical support (40) as shown in FIG. Also, fitting portions (43) of terminal plates (42) are integrally formed on the left and right sides of the center portion of the unit cover (37), respectively.
Are electrically connected via electronic components such as a lead wire (44) and a resistor (45), and the wiring portion is covered with a cover plate (46). And each terminal board (4
2) is connected to a power supply circuit by a terminal screw (47) screwed to this, and constitutes a power supply circuit to the indicator lamp (41). The lens (39) is provided with an indicator light (4) when the switch case (21) is covered with the case cover (38).
It is installed at a location facing 1).

The above-mentioned display mechanism comprises a contact block unit (20) and a switch case (1) above the contact block unit (20).
The indicator light (41) and the indicator light (41) are provided on the upper surface of the unit cover (37) of the contact block unit (20) by utilizing the space existing between the case lid (38) and the case lid (38). On the other hand, since the terminal plates (42) provided with the power supply wirings are respectively provided, no special space is required.
Further, no special parts for wiring are required. At the time of assembling, the indicator lamp (41) is attached to the unit cover (37) of the contact block unit (20), and the indicator lamp (41) is wired to the terminal plate (42), and then is housed in the switch case (17). The wiring work between the terminal board (42) and the power supply circuit is also performed by the case cover (3) of the switch case (17).
8) can be performed in a completely removed state, so that workability is extremely good.

The switching operation of the above embodiment is not the gist of the present invention, and will be briefly described below. When the door is moved in the closing direction and the switching actuator (2) is inserted, for example, through the insertion hole (5a) into the passive operating section (4) of the switch body (1), first, the pair of switching actuators (2) is moved. The two cam-shaped plates (10) are in sliding contact with the slope (6a) at the tip of each of the operating pieces (6), so that each cam-shaped plate (10) comes close to each other against the urging force of the compression spring (11). Pushed in the direction. At the time when each cam-shaped plate (10) has slidably contacted the slope portion (6a), each locking projection (14) of each cam-shaped plate (10) comes into contact with each corresponding support of the pin guide body (15). The detent of each cam-shaped plate (10) is released apart from the plate (15a). At the same time, the operating rod (7) of the switching actuator (2)
Each of the cam-shaped plates (10) comes into contact with an operation receiving surface (12a) of each notch (12).

Thereafter, when the switching actuator (2) is further inserted, the operation receiving surface (1) is operated by the operation rod (7).
2a) is pressed to rotate the two cam-shaped plates (10) in the counterclockwise direction in FIGS. 2 and 3, whereby both sides of the cam follower pin (16b) are brought into the guide cam holes (1).
3) and slides rearward while being guided by the guide notch (15b), and follows the cam follower pin (16b).
The operation rod body (16) integrally provided with is also moved rearward, and the engagement portion (33) engages with the operation engagement portion (16c) of the operation rod body (16) and is connected. The holder (26) is also moved rearward integrally with the operation rod body (16).

When the cam-shaped plate (10) is rotated until the switching actuator (2) is completely inserted and the cam follower pin (16b) reaches the end of the guide cam hole (13), the switch section ( In 3), the normally closed movable contact (2) is moved by the rearward movement of the contact holder (26).
8) is separated from the normally-closed fixed contact (22), and then the normally-open movable contact (30) comes into contact with the normally-open fixed contact (24) to switch the switch section (3), that is, the contact block unit (20). Is switched, and the industrial machine installed inside is brought into an operable state. Next, when the operation of the industrial machine is stopped, or when the lock provided with the lock mechanism is detected, the solenoid is operated by the detection of the stop of the machine, and the mechanical lock state by the lock mechanism is released. When the status becomes good, the status is displayed by turning on the indicator lamp (41). As a result, when the door is opened, the operating rod (7) of the switching actuator (2) that moves in the direction of pulling out of the switch body (1) moves the return pressing surface (12).
By pressing b), each cam-shaped plate (10) is forcibly rotated clockwise in FIGS. 2 and 3, and the switch section (3) is switched to the original state by the operation substantially opposite to that described above.

[0021]

As described above, according to the safety switch device of the present invention, an indicator light and a power supply wiring for the indicator light are provided on the upper surface of the switch block by using the unit cover of the contact block unit. In addition to mounting the terminal plate, the display means is configured by arranging a lens at a position corresponding to the indicator light on the case cover of the switch case of the switch body, so that the case cover of the switch case and the contact block are provided. Since the existing member of the unit lid of the unit and the existing space between the two lids are used, a large space is not required and the number of parts can be reduced.

At the time of assembling, the mounting of the indicator light and the wiring to the indicator light are pre-assembled on the upper surface of the unit cover of the contact block unit. Since the subsequent wiring work can be performed with the case lid completely removed, the workability is greatly improved and the manufacture is extremely easy.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a part of an embodiment of the present invention is omitted.

FIG. 2 is a cross-sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view taken along line BB in FIG. 1;

FIG. 4 is a shearing right side view of the contact block unit, which is a main part of the same.

FIG. 5 is a cutaway rear view of the contact block unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch body 2 Switching actuator 3 Switch part 4 Passive operation part 5a, 5b Insertion hole 20 Contact block unit 21 Unit case 22 Normally closed fixed contact 24 Normally open fixed contact 26 Contact holder 28 Normally closed movable contact 30 Normally open Side movable contact 37 Unit cover 38 Case cover 39 Lens 41 Indicator light 42 Terminal plate

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-44926 (JP, A) JP-A-61-71515 (JP, A) JP-A-1-14834 (JP, A) JP-A-6-14834 52748 (JP, A) Japanese Utility Model Showa 61-184249 (JP, U) Japanese Utility Model Application No. Hei 4-21037 (JP, U) Japanese Utility Model Utility Model No. 4-52321 (JP, U) Japanese Utility Model Utility Model No. 5-87759 (JP, U) US Patent 4,395,608 (US, A) US Patent 4,658,102 (US, A) US Patent 4,695,684 (US, A) US Patent 4,963,706 (US, A) European Patent Application Publication 117396 (EP, A) European Patent Application Publication 184033 (EP, A) International Publication 90/8396 (WO, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A safety switch device which is more on-off opening and closing of the door, the switching actuator attached to the door, the switching actuator is inserted or
Others consists of a built-in passive operating unit changeover Waru switch body off the <br/> switch portion is actuated by being pulled out, in the switch case of said switch unit, holding the movable contact
With a contact holder and fixed contacts.
By moving the point holder, the movable contact
A controller that is configured to move in the direction
Tact block unit receives the contact holder
It is installed in a connected state to the
Upper surface of the unit lid of the contact block unit
In addition, an indicator light and a terminal with power supply wiring for the indicator light
A plate is arranged, and a case cover of the switch case is provided.
Is provided with a lens at a position corresponding to the indicator light.
Safety switch device, characterized in that that.