JP2564372Y2 - 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-type 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, an actuator attached to a door or the like inserts into a switch body when the door is closed and rotates the cam-shaped plate of the internal passive operation unit in the forward direction. ,
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, and the switch unit is switched. When the cam-shaped plate is rotated in the opposite direction by the switching actuator which moves in the pull-out direction from the switch body when the door is opened, the contact holder is moved via the operating rod body to switch the switch portion to the original state. There are things that have become structured.

[0004]

However, in this type of conventional safety switch device, the operation rod body of the front passive operation unit and the contact holder of the rear switch unit in the switch body are formed by integral parts. In this case, the operation rod body provided integrally with the contact holder of the switch unit is connected to the passive operation unit. It is very difficult to assemble the cam plate in the required form, and it is necessary to make adjustments so that the passive operation unit and the switch unit operate smoothly after each other. It has become expensive. Also, when replacing the switch part due to, for example, welding of a contact point or deterioration of a contact pressure spring,
Since the operation rod, which is a member of the passive operation unit, is integrated with the switch unit, only the switch unit cannot be replaced, and the entire switch body must be replaced, which is very uneconomical. It is.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a safety switch device in which the switch body can be easily assembled, no adjustment is required, and only the switch portion can be replaced.

[0006]

The safety switch device according to the present invention is a device which is turned on and off by opening and closing a door, and includes a switching actuator mounted on the door, and an insertion or removal of the switching actuator. And a switch main body in which a built-in passive operation unit is operated to switch the switch unit. The passive operation unit includes a cam that rotates in a forward or reverse direction by inserting or removing a switching actuator. Plate, and an operating rod body reciprocating in a linear direction with a cam follower pin attached to one end thereof being engaged with the cam-shaped plate, and a connecting member at the other end of the operating rod body. The switch case of the switch unit has a contact holder holding movable contacts and a fixed contact. A contact block unit configured to move in a direction in which the movable contact moves toward and away from the fixed contact is provided, and at a tip end of a portion where the contact holder projects from a unit case of the contact block unit, An engagement portion detachably engaged with the coupling engagement portion of the operation rod body is formed,
The operation rod body and the contact holder are connected so as to be integrally movable by the engagement between the connecting engagement portion and the engagement portion.

[0007]

At the time of assembly, the contact block unit is inserted into the unit case from above, for example, so that the engaging portion at the tip of the contact holder protruding from the unit case of the contact block unit becomes the operating rod body of the passive operation unit. Since the operating rod body and the contact holder can be connected so as to move integrally with each other by engaging with the connecting engaging portion at the rear end, only the passive operating portion and the switch portion are separately manufactured and combined in the switch case. Since it is extremely easy to manufacture and requires no adjustment or the like, the number of manufacturing steps can be greatly reduced and a considerable cost reduction can be achieved.
In addition, even if a problem to be replaced occurs in the switch section, it can be dealt with only by replacing only the contact block unit in the switch section.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 8 show an embodiment of the present invention. As shown in FIG. 1 which shows an overall perspective view, a switch body (1) having an outer box shape and a plate key shape as a whole. And a switching actuator (2), and the switch body (1) is further provided on the rear side of the switch body (1) (right side in FIG. 1).
And a passive operation unit (4) on the front side which is operated by the switching actuator (2) to switch the switch unit (3). The switching actuator (2) has its mounting substrate (5) fixed to a movable member, for example, a door, with a screw in a protruding state in the door opening and closing direction. On the other hand, the switch body (1) has two insertion holes (6a) and (6b) formed in the lid (6) of the passive operation unit (4) when the door is closed.
The switching actuator (2) is fixedly installed at a predetermined location so as to be inserted from either of the above. In this embodiment, an example is shown in which the switching actuator (2) can be selectively inserted into any one of two orthogonal directions, and the switching actuator (2) can be selectively inserted into the switching actuator (2). Slotted insertion holes (6a) and (6b) are formed in the surface.

The switching actuator (2) is provided with a board portion (5) to be attached to a door or the like with a screw, and protrudes from the board portion (5) in parallel at a predetermined interval in a direction orthogonal to each other so as to face the front end facing surfaces. A pair of operating pieces (7) formed with pressing slopes (7a) and (7b) and an operating rod (8) installed between the two operating pieces (7) at right angles to them are integrated. Is formed.

Next, an outline of the switch body (1) is a plan view showing a state in which a cover (9) of the switch section (3) and a cover (6) of the passive operation section (4) are excluded. 2. Cross-sectional view taken along line AA in FIG. 2 and BB
This will be described with reference to FIGS. 3 and 4 which show cross-sectional views taken along the line. First, as shown in FIG. 2, the passive operation unit (4) includes a pair of support bases (10) provided on both left and right sides.
A pair of cam-shaped plates (12) having the same shape are rotatably and slidably inserted through a support shaft (11) provided therebetween. The two cam-shaped plates (12) are urged in a direction away from each other by a compression spring (13) interposed therebetween to form a pair of support plates (18b) of a pin guide body (18) described later.
Are in contact with each other.

A pair of cam-shaped plates (12) having the same shape are
As clearly shown in FIG. 4, two insertion holes (6a) and (6b)
Two notches (14) of the same shape formed corresponding to
One of the opposing sides is an operation receiving surface (14a), and the other side is a return receiving surface (14b). A guide cam hole (15) is formed at a position opposite to the notches (14), and locking projections (16) and (17) are formed on both sides of the starting end of the cam hole (15). ) Is protruded.

A pin guide body (18) fixed to the rear portion of each cam-shaped plate (12) is bent in a front U-shape and has a slot-shaped guide notch (18b) on both sides. A pair of support plates (18a) are erected, and each of the support plates (18a) is
a) abuts on a portion between the pair of locking projections (16) and (17) on each cam-shaped plate (12) urged by the compression spring (13), whereby each Cam-shaped plate (1
2) is stopped. An operation rod body (19) having a spring receiving disk portion (19a) at a substantially central portion.
Is a switch case (2) whose rear end portion is a switch portion (3).
0), the both ends of the cam follower pin (19b) fixed to the front end orthogonally to the front end and the guide cam holes (15) of the cam plate (12) respectively. Insert and guide notch at each end (18
By being slidably engaged with b), the support plate (18a) and the switch case (20) are stably held movably in the front-rear direction by two-point support by the switch case (20). Also, as one of the constituent elements of the present invention, an L-shaped hook-shaped coupling engaging portion (19c) is formed to protrude rearward from the lower rear end of the operating rod body (19). . still,
The portion between the spring receiving disk portion (19a) of the operating rod body (19) and the switch case (20) is a rubber bellows (2).
The cam follower pin (19b) is normally covered as shown in FIGS. 3 and 4 because the operating rod body (19) is urged forward by the return spring (22). At the beginning of the guide cam hole (15).

Next, the switch section (3) has a structure in which a contact block unit (23) is detachably mounted inside a switch case (20). This will be described in detail with reference to FIG. 5 showing a diagram, FIG. 6 showing a cut right side view, and FIG. 7 showing a cut back view. In the contact block unit (23), a pair of terminal plates (26) each having a normally closed fixed contact (25) is fitted on the left and right sides of a front end portion in the unit case (24), and a rear end portion. On both sides,
Terminal plates (2) each having a normally open fixed contact (27)
8) 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 (24).
9) is movably inserted and held. A holding hole (30) is formed in the center of the contact holder (29).
The holding hole (30) is provided with a normally closed terminal plate (32) having a pair of normally closed movable contacts (31) at both ends, and a pair of normally open movable contacts (33) at both ends. Normally open terminal plate (3
4) are inserted so as to face each other, and a contact pressure spring (35) is interposed between the terminal plates (32) and (34) to urge them in a direction away from each other. Also,
An inverted L-shape, which is engaged with the connection engaging portion (19c) of the operating rod body (19) from above and is connected to the contact holder (29) so as to move integrally with the contact holder (29) at the upper front end of the contact holder (29). A hook-shaped engaging portion (36) having a shape is protruded.
The upper opening of the unit case (24) is covered with a unit cover (37).
7), the contact holder (29) is movably held without being pulled out, and is normally closed by a return spring (40) which normally urges the contact holder (29) shown in FIGS. 4 and 7 forward. The side movable contact (31) is pressed against the normally closed fixed contact (25). The fixed terminal plates (26) and (28) are wired by terminal screws (38) and (39), and are inserted and connected to a power supply circuit of an industrial machine or the like whose operation is to be controlled.

Next, the switching operation of the embodiment will be briefly described with reference to FIG. Now, the switching actuator (2) is attached to the end face of the door in a protruding state, and when the switch body (1) is closed, the switching actuator (2) is inserted from the insertion hole (6a) or (6b). When the door is opened, the operating rod body (19) and the contact holder are urged by the biasing force of the return spring (22) when the door is opened, as shown in FIGS. (29) moves forward, and the cam follower pin (19b) moves to the guide cam hole (1).
5), and a pair of locking projections (16) of each cam-shaped plate (12) pressed against each support plate (18a) by the urging force of the compression spring (13) in this state. , (17)
Are located on both sides of the support plate (18a),
Each of the cam-shaped plates (12) is positioned so as to be prevented from rotating more than a predetermined angle, and the contact holder (29) moves forward in the switch section (3) to move the normally closed movable contact ( 31) is pressed against the normally closed fixed contact (25) by the urging force of the contact pressure spring (35), and is reliably electrically connected.

Then, when the door is moved in the closing direction and the switching actuator (2) is inserted into the passive operating section (4) of the switch body (1) through, for example, the insertion hole (6a), first, the switching actuator ( The two cam-shaped plates (1) are provided on the slopes (7a) at the respective ends of the pair of operation pieces (7) of (2).
By the sliding contact of 2), the respective cam-shaped plates (12) are pushed toward each other in a direction close to each other against the urging force of the compression spring (13). When the two cam-shaped plates (12) have come into sliding contact with the respective slopes (7a), each of the locking projections (1
6) and (17) are separated from the corresponding support plates (18) of the pin guide body (18), and the detent of each cam-shaped plate (12) is released. At the same time, the operating rod (8) of the switching actuator (2) comes into contact with the operation receiving surface (18a) of each notch (14) of each cam-shaped plate (12). Thereafter, when the switching actuator (2) is further inserted, the operation receiving surface (14a) is actuated by the operation rod (8).
Is pressed to rotate the two cam-shaped plates (12) in the direction of the arrow in FIG. 8, whereby both sides of the cam follower pins (19b) slide along the guide cam holes (15), and the guide notches are formed. The operation rod body (19) integrally provided with the cam follower pin (19b) is also moved rearward as shown by an arrow, and is connected to the operation rod body (19) by the guide rod (19b). The contact holder (2) in which the engaging portion (36) is engaged and connected to the engaging portion (19c).
9) is also moved backward integrally with the operation rod body (19).

When the switching actuator (2) is fully inserted as shown in FIG. 8 and the cam plate (12) is rotated until the cam follower pin (19b) reaches the end of the guide cam hole (15). , In the switch section (3),
After the normally closed movable contact (31) is separated from the normally closed fixed contact (25) by the rearward movement of the contact holder (29), the normally open movable contact (33) is moved to the normally opened fixed contact (27). )
And the switch section (3) is switched. next,
When the door is opened, the operating rod (8) of the switching actuator (2), which moves in the direction of withdrawing from the switch body (1), presses the return receiving surface (14b) to press each of the cam-shaped plates (14). 12) is forcibly rotated in the direction opposite to the arrow in FIG. 8, and the switch section (3) is switched to the original state by an operation almost reverse to the above.

At the time of assembling the safety switch device, the contact block unit (23) is inserted into the switch case (20) from above, so that the unit case (2) of the contact block unit (23) is inserted.
The engaging portion (36) at the tip end of the contact holder (29) projecting from 4) is used as the operating rod body (19) of the passive operating portion (4).
The operating rod body (19) and the contact holder (29) can be connected so as to move integrally with each other by engaging with the connecting engagement part (19c) at the rear end of the passive operating part (4) and the switch part. It is only necessary to separately produce (3) and combine them in the switch case (20). This makes production extremely easy, and furthermore, no adjustment or the like is required. Can be achieved. In addition, when a problem to be replaced occurs in the switch unit (3), the contact block unit (2) in the switch unit (3) is used.
It can be dealt with simply by replacing only 3).

FIGS. 9 and 10 (a) and 10 (b) show the main parts of another embodiment of the present invention. In these figures, the same parts as those of the above embodiment are denoted by the same reference numerals. It is.
FIG. 9 shows a state in which a projecting connection engaging portion (19d) is recessed on the upper surface of the rear end portion of the operating rod body (19), and the connection engaging portion (19d) is provided above the front end of the contact holder (29). 19d), a T-shaped engaging portion (41) which is engaged from above is protrudingly provided, and the operating rod body (19) and the contact holder (29) are detachable similarly to the above embodiment. Can be connected to

FIGS. 10 (a) and 10 (b) show a right side view and a plan view of a main portion of still another embodiment, in which a rectangular concave portion is connected to the upper surface of the rear end of the operating rod body (19). And a contact holder (2e).
An engaging portion (42) that fits into the coupling engaging portion (19e) is protrudingly provided at an upper portion of the front end of the coupling engaging portion (19).
e) and an engaging portion (42) are provided with insertion holes that match each other when they are fitted, and a connecting pin (43) is inserted into both insertion holes and caulked to form an operating rod body. (19) and the contact holder (29) can be removably connected so as to move integrally, and the number of steps of inserting the connecting pin (43) and caulking is increased compared to the above embodiments. The contact holder (29) can be movably held without having to be held by the unit lid (37).

[0020]

As described above, according to the safety switch device of the present invention, the engagement portion is formed at the end of the operation rod body that reciprocates linearly by inserting and removing the switching actuator in the passive operation portion of the switch body. And a contact holder movably held in a unit case of a contact block unit constituting a switch portion of the switch body.
A part is projected from the unit case, and at the tip of the projected part, an engaging part is formed which is detachably engaged with the engaging part of the operation rod body so as to be integrally connected to the engaging part. Therefore, when assembling, by inserting the contact block unit into the switch case, for example, from above, the engaging portion at the tip of the contact holder protruding from the unit case of the contact block unit is located behind the operating rod body of the passive operating portion. Since the operating rod body and the contact holder can be connected so as to move integrally by engaging with the connecting engagement part at the end, it is only necessary to separately manufacture the passive operating part and the switch part and combine them in the switch case. Since the assembling is very easy and no adjustment or the like is required, the number of manufacturing steps can be greatly reduced and a large cost reduction can be achieved. In addition, even if a problem to be replaced occurs in the switch section, it can be dealt with only by replacing only the contact block unit in the switch section.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a plan view showing a state where a cover of a switch main body is removed.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a partially cut plan view of the contact block unit of the switch unit according to the first embodiment;

FIG. 6 is a cut-away right side view of the contact block unit.

FIG. 7 is a cutaway rear view of the contact block unit.

FIG. 8 is a right side view showing a state where the switching of the switch unit is completed by inserting the switching actuator.

FIG. 9 is a plan view of a main part of another embodiment of the present invention.

FIGS. 10A and 10B are a right side view and a plan view, respectively, of a main part of still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch body 2 Switching actuator 3 Switch part 4 Passive operation part 12 Cam-shaped plate 19 Operation rod body 19b Cam follower pin 19c-19e Connection engagement part 23 Contact block unit 24 Unit case 25 Normally closed fixed contact 27 Normally open Fixed contact 29 Contact holder 31 Normally closed movable contact 33 Normally open movable contact 36, 41, 42 Engagement part

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-6-52748 (JP) U.S. Pat. No. 4,210,608 (US, A) U.S. Pat. No. 4,658,102 (US, U.S. Pat. No. 4,658,102) A) U.S. Pat. No. 4,695,684 (US, A) U.S. Pat. No. 4,963,706 (US, A) EP 117396 (EP, A) EP 184033 (EP, A) WO 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, the passive operating portion, the insertion of the switching actuator
Or a cam that rotates in the forward or reverse direction when pulled out
The plate and a cam follower pin attached to one end
Operating rod reciprocating in the linear direction by being engaged with the plate
Is provided, and is connected to the other end of the operation rod body.
And a movable contact is held in the switch case of the switch unit.
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
The tact block unit is provided and
The contact holder is the unit of the contact block unit.
At the tip of the part protruding from the
An engaging portion detachably engaged with the coupling engaging portion of the body is formed.
The engagement between the coupling engagement portion and the engagement portion causes
The operating rod and the contact holder can move together
A safety switch device characterized in that it is configured to be connected in a state .