JPH11256960A - Electric opening-closing device for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a load detection in excellent detecting accuracy during a power transmission system between an electric motor and a shutter curtain. SOLUTION: In the case where a rotation load detecting device is severally provided between the first and the second transmission shaft 10, 11 to compose a power transmission course and between an output shaft 7 and the second transmission shaft 11, the shafts 10, 11 or the shafts 7, 11 are severally unitedly provided with the first and the second cylindrical body 10e, 13 or 7e, 20, and these first and second cylindrical bodies 10e, 13 or 7e, 20 are changed over into a power cut state among the shafts when a load acts on the shaft, and relatively rotate as much as a fixed idle angle. The third cylindrical bodies 17, 21 are axially displaced on these rotations, and micro-switches 19, 23 to function as a power source for an electric motor can be switch-exchanged into a purpose state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an electric switchgear for a building to be built at an opening of a building or the like.

[0002]

2. Description of the Related Art Generally, in a constructional electric opening / closing device which opens and closes an opening / closing body by a driving force of an electric motor (switching machine), for example, when this is a constructional electric shutter,
Obstacle detection means for detecting obstacles, since the shutter curtain may pinch obstacles during closing operation,
It is desirable to provide automatic stop control means for automatically stopping the closing operation of the opening / closing body based on the obstacle detection. The obstacle detection means includes a direct detection type in which an obstacle is detected by an obstacle detection sensor such as a seat plate switch provided on the opening / closing body, and a load fluctuation (torque fluctuation) of the electric motor caused by pinching of the obstacle. The indirect detection type is known, but the indirect detection type does not require the provision of an obstacle detection sensor in the opening / closing body and has the advantage that the obstacle detection means can also be used as the limit detection means.

[0003]

In the above-mentioned conventional indirect detection method, load fluctuation is detected based on a change in rotation speed (or change in rotation speed) or a change in current value (or change in voltage value). In a typical architectural electric switchgear, it is preferable to drive the electric motor in a rotation range where the change in the number of revolutions due to load fluctuations is small in order to obtain a stable opening and closing speed. Is small, and the current value also changes due to disturbances other than load fluctuations. In any case, it is necessary to reduce the detection sensitivity to secure operation stability, and as a result, perform highly accurate obstacle detection. There is a problem that this is difficult, and there is a problem to be solved by the present invention. In addition, in the above-described conventional motor, the power transmission is continued even if the abnormal load is detected, so that the opening and closing operation of the shutter curtain continues during the time lag from the detection of the abnormal load to the complete stop of the motor. There is a problem that
Here, too, there was a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made for the purpose of solving these problems. An opening / closing body for opening and closing an opening is provided by an electric motor. In a constructional electric switchgear that opens and closes with a driving force, a load detecting means for detecting that an abnormal load has acted on the switch body is provided in a power transmission path for transmitting power from the electric motor to the switch body side. Abnormal operating means for switching the detecting means to an abnormal position in order to cut off power transmission in response to the application of an abnormal load, and switch switching for cutting off the motor power in response to the abnormal operating means switching to the abnormal position. And a switch switching means for performing the following. In this way, load detection with high detection accuracy can be mechanically performed. In this case, the power transmission path of the present invention may be configured such that at least two transmission shafts are connected, and a load detecting unit is provided at a connection portion between the transmission shafts. Further, the abnormal operation means of the present invention is provided with a first cylindrical body integrally formed on one transmission shaft and formed with a protruding piece toward the other transmission shaft side, and integrally formed on the other transmission shaft. A second cylindrical body formed with a concave portion for engaging the first cylindrical projecting piece in a state of allowing rotation at a predetermined play angle, and a penetrating shape in a state in which the second cylindrical body can be moved forward and backward in the axial direction; And a biasing machine for biasing the pin toward the first cylinder body, and the first cylinder body has a fitting groove in which the tip of the pin fits freely. Formed, and the pin tip is retracted from the fitting groove against the biasing force of the machine to be in a power-off state, and the first and second cylinders relatively rotate within the play angle range. It is assumed that the posture is switched to an abnormal posture, and the switch switching means rotates integrally with the second cylindrical body and is provided so as to be relatively rotatable with respect to the first cylindrical body. It can be made the secondary cylindrical body is configured to perform switching of displacement to detect switch in conjunction with be the abnormal posture. Thus, the load acting on the connecting portion between the transmission shafts is mechanically detected, and the power transmission is cut off. Therefore, the opening and closing operation of the shutter curtain can be avoided during the time lag until the electric motor stops.

[0005]

FIG. 1 shows an embodiment of the present invention.
Explanation will be made based on the drawings shown in FIGS. In the drawing,
Reference numeral 1 denotes a shutter curtain of an electric shutter. The shutter curtain 1 is wound around a winding drum 2 to open the opening, and is closed from the winding drum 2 to close the opening. It is set so as to ascend and descend to a posture, and all of these basic configurations are the same as before. Reference numeral 3 denotes a guide rail that is provided upright on both left and right sides of the opening and guides the left and right side edges of the shutter curtain 1 to move.

The take-up drum 2 is balanced with the feeding load of the shutter curtain 1 by a well-known balance elastic machine (not shown), and is fixedly supported between a pair of left and right brackets 4 disposed above the frame. A sprocket 2 is rotatably fitted on the shaft 2a and has a sprocket 2 at one end.
b are integrally connected. On the other hand, 5 is a switchgear unit arranged in parallel below the winding drum 2,
The switchgear unit 5 outputs the driving force of the electric motor 6 via an output shaft 7 protruding from one end of the unit, and a sprocket 7a integrally provided on the output shaft 7 is provided on the winding drum 2 side. The chain 2c is set to be transmitted to the sprocket 2b, whereby the forward / reverse drive of the electric motor 6 is transmitted to the winding drum 2 for power, and the shutter curtain 1 is opened and closed.

The switchgear unit 5 is provided with a reduction gear 8 in a power transmission path from the electric motor 6 to the output shaft 7.
And the load detection device 9 are connected. Here, as the reduction gear 8 connected to the electric motor 6, a general-purpose reduction gear is used, and the driving force of the electric motor 6 is set to be output in a state of being reduced from the output shaft 8 a of the reduction gear 8. However, details of the configuration are omitted. A load detecting device 9 is provided between the speed reducer 8 and the output shaft 7. The load detecting device 9 has an abnormality in a power transmission path due to shaft transmission from the speed reducer output shaft 8 a to the output shaft 7. It is set to detect load (overload). In the present embodiment, the reduction gear output shaft 8
a between the first and second transmission shafts 10 and 11
, A forward rotation load detecting device 9F for detecting an overload in the forward rotation is provided at the connection between the first transmission shaft 10 and the second transmission shaft 11, and the second transmission shaft 11 is connected to the output. A reverse rotation load detecting device 9B for detecting an overload in the reverse rotation is provided at a connection portion with the shaft 7, so that an abnormal load in both directions can be detected. Here, in the present embodiment, rotation in the direction of arrow X in FIG. 6 is referred to as rotation in the forward direction, and for convenience of description, the rotation in the forward direction is referred to as rotation in the direction in which the shutter curtain 1 operates to close. There is no problem with the rotation relationship in the reverse direction.

Next, the forward rotation load detecting device 9F will be described. The first transmission shaft 10 has a keyway 1 at the other end.
0a is formed, and the reduction gear output shaft 8a is connected to the key groove 10a in a key-fitting manner, so that the first transmission shaft 10a is formed.
And the reduction gear output shaft 8a are set to rotate integrally. On the other hand, one end of the first transmission shaft 10 is formed in a cylindrical portion 10b having a cylindrical hole, and the other end of the second transmission shaft 11 is rotatably fitted in the cylindrical portion 10b. At this time,
The first and second transmission shafts 10 and 11 correspond to the two end portions of the pin shaft 12 supported through the other end of the second transmission shaft 11 in the radial direction formed in the first transmission shaft tube portion 10b. A long pair of long holes 10
By fitting each to c in a protruding and retaining shape,
The first transmission shaft 10 is set so as to be connected to the first transmission shaft 10 in a state where relative rotation is allowed within a predetermined angle (play angle). Is set so that rotation beyond the range of the elongated hole 10c is connected and incorporated in a state where the rotation is restricted. Further, the cylindrical portion 10b
Of the large-diameter first cylindrical body 1 via the step 10d
0e is integrally formed, and a pair of protruding pieces 10f facing one end side are formed on the end face of the first cylindrical body 10e at equal intervals. Further, a fitting groove 10g which is long in the radial direction and has an inclined side in the circumferential direction is recessed at four circumferential positions on one side surface of the stepped portion 10d.
On the other side of 0d, hemispherical concave holes 10h are provided at two locations in the circumferential direction at equal intervals, and these protruding pieces 10f, fitting grooves 10g and concave holes 10h are provided. The formation position will be described later.

On the other hand, the second transmission shaft 11 has key surfaces 11a formed at both ends thereof, and a second cylindrical body 13 is formed at the other end (one end of which will be described later).
Are fitted and assembled in a state where the second cylindrical body 13 and the second transmission shaft 11 are prevented from rotating and rotate integrally with each other.
The second cylindrical body 13 is the first cylindrical body 10e in the assembled state.
And a pair of recesses 13a in the circumferential direction formed on the end surface of the other end of the cylinder are configured to engage with the first cylindrical projecting piece 10f. The first and second cylindrical bodies 10e and 13 have the same protruding piece 10f in the forward rotation direction upper surface 10i abutting on the forward rotation direction upper side regulating surface 13b of the second cylindrical body recess 13a or the lower side surface 10j. Poor side regulation surface 1
By being in contact with 3c, rotation of relative rotation in the corresponding direction is restricted. Here, the relationship between the formation positions of the protruding pieces 10f and the recessed portions 13a is, as described above, restricted by the rotation of the first and second transmission shafts 10, 11 due to the relationship between the pin shaft 12 and the elongated hole 10c. The first and second cylindrical bodies 10e and 13 are formed so as to have a positional relationship to receive the corresponding rotation restriction.

Further, in the second cylindrical body 13, pin holes 13d facing the first cylindrical body fitting groove 10g are formed at four circumferential positions so as to penetrate in the axial direction. A pin 14 longer than the second cylindrical body 13 is incorporated in the pin hole 13d so as to be movable in the axial direction. When the pin hole 13d and the fitting groove 10g face each other, the protruding end of the pin 14 fits into the fitting groove 10g, but the pin 14 is attached by an elastic device 15F described later. Being urged,
The first and second cylindrical members 10e, 1
3 are connected in a series, and the first and second transmission shafts 10 and 11 are set to be maintained in a continuous power state. In this state, the normal opening and closing operation of the shutter curtain 1 is performed. . As described above, since the fitting groove 10g is formed on the side surface that is inclined in the circumferential direction, an abnormal load (overload) acts and the first and second cylindrical bodies 10e and 13 are relatively opposed to each other. When a rotational force is generated, the pin 14 is set out of the fitting groove 10g against the elastic device 15F, and the first and second cylindrical bodies 10e and 13 are set in a power-off state. Here, the first cylindrical protrusion 10f and the second cylindrical recess 1
10g and pin hole 13d with respect to the formation position of 3a
In the state where the fitting groove 10g and the pin hole 13e are opposed to each other and the normal opening / closing operation is being performed with the power connection state, the lower side surface 10j and the concave portion 13f of the protruding piece 10f are formed.
6A is in contact with the lower regulating surface 13c, and this state is set to the normal posture of the first and second cylindrical bodies 10e and 13 shown in FIG.

The urging force of the elastic device 15F is a relative rotational force (load) generated between the first and second transmission shafts 10 and 11 when the shutter curtain 1 is normally closed.
Is set to be larger than
g is prevented from falling off, and the power is maintained.
On the other hand, an abnormal load exceeding the set urging force between the first and second transmission shafts 10 and 11, that is, when the electric motor 6 is rotating in the forward direction to drive the shutter curtain 1 in the closing direction. When a load is applied that occurs when the shutter curtain 1 stops upon hitting the floor or an obstacle, the pin 14 comes out of the fitting groove 10g against the urging force of the elastic device 15F. The first and second transmission shafts 10 and 11 are retracted to one end side in the axial direction to bring the first and second transmission shafts 10 and 11 into a power-off state.
The competitors are allowed to rotate relative to each other, and move from the normal posture to the abnormal posture (FIG. 6B) in which the upper side surface 10i of the protrusion 10f contacts the upper side regulating surface 13b of the recess 13a. It is set to rotate. here,
The positional relationship between the fitting groove 10g and the pin 14 is set such that the pin 14 does not enter the fitting groove 10g when the first and second cylindrical bodies 10e and 13 are in the abnormal posture, and the power is cut off. Is maintained.

On the other hand, reference numeral 17 denotes a third cylindrical body corresponding to the switch switching means of the present invention. The third cylindrical body 17 is a flange portion which abuts on one side surface of the step portion 10d of the first transmission shaft 10. 17a and a cylindrical support portion 17b slidably fitted to the first transmission shaft cylindrical portion 10b. A pair of axially long through holes 17c are formed in the support portion 17b in the circumferential direction, and each of the elongated holes 17c projects from the outer peripheral surface of the first transmission shaft cylindrical portion 10b. By engaging the both ends of 12 in a retaining shape,
The third cylindrical body 17 is set so as to be axially movable with respect to the first transmission shaft 10 and relatively rotatable with the first transmission shaft 10 together with the second transmission shaft 11. Further, in the third cylindrical body 17, a projection 17d is formed on one side surface of the flange portion 17a so as to be able to protrude and retract into each of the concave holes 10h, and the projection 17d is engaged with the concave portion 10h by a return elastic machine 17e. The projection 17d and the concave hole 1
0h is formed in a positional relationship in which the first and second transmission shafts 10 and 11 are engaged and in a non-operating posture when the power is continuously applied. Furthermore, a guide surface 10k for exit is formed at the hole end of the concave portion 10h so that when the projection 17d rotates in the opposite direction, the projection 17d exits and rides on the step surface portion 10d.

The first and second transmission shafts 10, 11
Is in a power-off state and relatively rotates, and the first and second cylindrical bodies 10
e, 13 When the comrades change to an abnormal posture, the third cylindrical body 17
Rotates in the opposite direction with respect to the first cylindrical body 10e, so that the projection 17d comes out of the concave hole 10h against the return elastic machine 17e, and the third cylindrical body 17 is moved to the other axial side. It is set so that the operating posture is displaced. Then, the third cylinder 17 in the operating posture is mounted on the positive rotation load detecting device 9.
The switching of a micro switch (detection switch) 19 provided in a housing 18 for housing F is performed so that the drive of the electric motor 6 is stopped by this. In addition, the third cylinder 17 transformed to the operating posture and the second cylinder 13 transformed to the abnormal posture are respectively returned to the return cylinder when the electric motor 6 rotates in the opposite direction, that is, in the opposite direction. 17e, it is set to return to the original position by receiving the urging force of the bullet device 15F. In this connection, a return elastic machine 17e for urging the third cylindrical body 17 toward the first cylindrical body 10e.
Is the third cylindrical body 17 which has been brought into the operating posture by the relative rotation.
However, any material having a small urging force enough to promote the operation of returning to the non-operation position in which it is immersed in the concave hole 10h with the rotation in the opposite direction may be used. Further, the third cylinder 17 is configured to be displaced in the axial direction in accordance with the relative rotation of the first and second cylinders 10e and 13 to switch the micro switch 19, and that the third cylinder 17 is operated in the axial direction. Since the displacement stroke of the micro switch 19 is regulated by the protruding length of the projection 17d, the pressing operation of the micro switch 19 can be made constant, thereby protecting the micro switch 19.

Incidentally, the third cylindrical body 17 is provided with
When the load exceeds the urging force of 5F and the second cylinder 13 is in the abnormal posture, the operation posture is set based on the abnormal posture, and this is used as load detection to perform switch switching. 19, that is, the third cylindrical projection 17d is not
The timing for riding on the first cylinder 1d and the second cylinder 1
0e, 13 are switched as soon as they start relative rotation (switched by a small angle of rotation). Therefore,
The amount of rotation allowed by the relationship between the protruding piece 10f and the recess 13b is determined by the shutter curtain 1 after the switch is switched.
Are set to such an extent that rotation based on a time lag until the vehicle actually stops can be tolerated.

On the other hand, in the present embodiment, a reverse rotation load detecting device 9B for detecting a rotation load in the reverse direction is further provided.
The output shaft 7 is provided at a connecting portion between the one end on which the first shaft 1 a is formed and the output shaft 7. That is, the second cylindrical body 20 provided integrally with the second transmission shaft 11, the concave portion 2 formed in the second cylindrical body 20.
0a, the upper regulation surface 20b in the forward rotation direction of the recess 20a, the lower regulation surface 20c, the pin hole 20d in which the pin 14 is fitted,
The urging machine 15B for urging the pin 14, the cylinder 7 of the output shaft 7
b, a first cylindrical body 7e integrally formed via a stepped portion 7d, a protruding piece 7f formed on the first cylindrical body 7e, and formed on one side surface of the stepped portion 7d. 7g, a concave hole 7h formed in the other side surface portion, and a first cylindrical body 7e.
Forward rotation load detecting device 9F such as the third cylindrical body 21 mounted on the
It has the same configuration as. And one end of the second transmission shaft 11 is provided point-symmetrically with the forward rotation load detecting device 9B with the elastic device 15 described later interposed therebetween, but the forward and reverse rotation load detecting devices 9F and 9B are respectively provided. Housing 18, 2
The switch unit 5 is formed by incorporating the electric motor 6 and the reduction gear 8 into the switch unit 5 and winding it. The setting is such that the drum 2 is provided in parallel.

Then, the electric motor 6 rotates the shutter curtain 1 in the closing operation direction, and the forward rotation load detecting device 9F
Is the same as described above, but in this case, the reverse rotation load detecting device 9B includes the lower side surface 7j of the first cylindrical protrusion 7f in the forward rotation direction and the lower side regulating surface 20c of the second cylindrical concave portion 20a. Is in a normal posture in which the first and second cylindrical bodies 7e and 20 are connected by the pin 14 in this state, and the power transmission state is established between the second transmission shaft 11 and the output shaft 7. Has been maintained. When an overload is applied in this state, the output shaft 7 tends to rotate relative to the second transmission shaft 11 in the opposite direction. It is in a posture, and the relative rotation of the protruding piece 7f in the reverse direction (downward side) is regulated, so that the normal posture is maintained, and the load is detected between the second transmission shaft 11 and the output shaft 7. However, the first and second transmission shafts 10, 1
The setting is such that the load detection operation is performed between the two. On the other hand, if an overload occurs during the opening operation of the shutter curtain, the reverse rotation load detection device 9B performs the detection operation, that is, the second cylinder 20 of the device 9B is abnormal with respect to the first cylinder 7e. The posture is set, and the third cylindrical body 21 is set so as to switch off the micro switch 23 provided on the housing 22 to cut off the power supply of the electric motor 6. At this time, in the forward rotation load detection device 9F, the protruding piece 10f and the concave portion 13a are in contact with the surfaces of the lower side in the forward rotation direction, and the rotation in the reverse rotation direction is maintained as a unitary rotation.
The second transmission shafts 10, 11 do not rotate relative to each other.

Further, as described above, in the forward and reverse rotation load detection devices 9F and 9B, the electric motor 6 rotates in the opposite direction to return from the detection operation state to the original state. When the forward rotation load detection device 9F performs the detection operation during the closing operation, the opening operation is performed, and when the reverse rotation load detection device 9B is operated during the opening operation, the closing operation is performed to return to this state. Therefore, in a state where the shutter curtain 1 is fully closed or fully opened and stopped, the state where the limit switches 19 and 23 are operated is maintained. Therefore, even if the shutter curtain 1 is further operated in the same direction in this state. Does not work. And
In the case where the shutter curtain 1 stops halfway after detecting an obstacle, the shutter curtain 1 cannot be operated in the same direction unless the operation of removing the obstacle or the operation in the opposite direction is performed. Become,
It is set to ensure safety. Incidentally, it is needless to say that the returning operation of the shutter curtain 1 in the opposite direction after the detection operation can be performed by slightly moving the shutter curtain 1 manually.

Now, regarding the above-mentioned elastic device 15, the elastic device 15 according to the present embodiment is composed of an elastic device 15F for detecting a forward rotation load and an elastic device 15B for detecting a reverse rotation load as one unit. It is incorporated in the second transmission shaft 11. That is, the screw shaft 24 constituting the elastic device 15 is disposed between the forward and reverse rotation load detecting devices 9F and 9B, and a screw groove 24a is formed on the outer peripheral surface. A spring washer 25 externally fitted to the second transmission shaft 11 so as to be movable in the axial direction is provided at an intermediate portion in the axial direction of the screw cylinder 24, and a projection 25 a projecting from an outer peripheral portion of the spring washer 25 is provided. The nut body 26 engages with the screw cylinder 24 via a screw cylinder through hole 24b. Further, large-diameter holes 27a and 28a, each of which is loosely fitted to the second transmission shaft 11, are bored at the cylinder end of the screw cylinder 24, and the forward and reverse rotation lid 2 is provided.
7 and 28 are fixed in a state of being screwed into the end of the screw tube 24. Then, between the lids 27 and 28 and the spring washer 25, forward and reverse rotation machines 29 and 30 are respectively mounted. As described above, these springs 29, 30 are set to a biasing force slightly exceeding the load generated when the shutter curtain 1 is normally opened and closed, and the pressing bodies 31, 32 which receive the biasing forces of the springs 29, 30. Are fitted in the lid large-diameter holes 27a, 28a in an axially movable and non-removable manner and protrude toward the second cylindrical bodies 13, 20.
The pressing bodies 31 and 32 are connected to the second cylindrical body 13 of the forward and reverse rotation load detecting devices 9F and 9b via washers 33 and 34, respectively.
The pin 14 mounted on the inside 20 is set so as to be pressed by the preset urging force, and thus the forward and reverse rotation load detecting elastic units 15F and 15B are respectively constituted. Here, the fine adjustment of the armature urging force of the armature device 9 can be performed by rotating the nut body 24 screwed to the screw cylinder 22 and moving it in the axial direction to adjust the position of the spring washer 23. It is set as follows.

In the embodiment of the present invention configured as described above, the shutter curtain 1 opens and closes by forward / reverse drive of the electric motor 6 based on the operation of an operation switch (not shown). When the shutter curtain 1 is fully closed or fully opened, or detects an obstacle, the electric motor 6
When an overload acts on the power transmission path between the motor and the shutter curtain 1, this is detected by either the forward or reverse rotational load detectors 9F and 9B, and the drive of the electric motor 6 is stopped. Become. Thus, the shutter curtain 1
In addition to the detection of fully closed and fully opened, the detection of an obstacle can be performed by a pair of forward and reverse rotation load detection devices 9F and 9B. For this reason, it is not necessary to provide a switch on the skeleton side to detect the fully closed or fully opened state, or to provide a switch on the seat plate of the shutter curtain to detect an obstacle. Moreover,
These forward and reverse rotation load detecting devices 9F and 9b mechanically detect a load generated at a connection portion between the first and second transmission shafts 10 and 11 and the output shaft 7 constituting a power transmission path, and As a result, even if there is a slight time lag until the electric motor 6 stops, it is possible to prevent the shutter curtain from opening and closing and moving in the idle state during this time. Thus, highly accurate load detection can be performed, and detection accuracy can be increased.

Further, in this embodiment, the urging force of the munitions 29 and 30 constituting the munitions device 15 can be performed by moving the nut body 24 screwed to the screw cylinder 22 in the axial direction. There is also an advantage that adjustment at the time of attachment becomes easy.

It should be noted that the present invention is not limited to the above-described embodiment, and a pin for connecting the first and second cylinders is provided with a spherical body 35a at the tip of the pin 35 as shown in FIG. They may be arranged, and in this case, there is an advantage that the protrusion and the recess in the fitting groove become smooth.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a shutter curtain.

FIG. 2 is a cross-sectional view of the rotation load detection device.

FIG. 3 is a perspective view of a rotation load detection device.

FIG. 4 is a partially exploded perspective view of the rotation load detection device.

FIG. 5 is a perspective view of a rotation load detection device.

FIG. 6 is a front view illustrating the operation of the load detection device.

FIG. 7 is a cross-sectional view illustrating an operation of a pin.

FIG. 8 is a cross-sectional view illustrating an operation of a pin according to the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shutter curtain 2 winding drum 5 switchgear unit 7 output shaft 9 load detection device 9F forward rotation load detection device 10 first transmission shaft 10f protruding piece 10g fitting groove 12 second transmission shaft 13 second cylindrical body 13a recess 14 pin 15 Ammunition device 17 Third cylinder 17d Projection

Claims (3)

[Claims] 1. An architectural electric switching device for opening and closing an opening and closing body for opening and closing an opening by a driving force of an electric motor.
In providing a power transmission path for transmitting power from the electric motor to the opening / closing body side with a load detecting means for detecting that an abnormal load has acted on the opening / closing body, the load detecting means is interlocked with the operation of the abnormal load. An architectural construction comprising: an abnormal operating means for switching to an abnormal posture to cut off power transmission; and a switch switching means for switching the motor power supply in conjunction with the abnormal operating means being switched to the abnormal posture. Electric switchgear. 2. The electric power switch for construction according to claim 1, wherein the power transmission path is formed by connecting at least two transmission shafts, and a load detecting means is provided at a connection portion between the transmission shafts. . 3. The transmission device according to claim 1, wherein the abnormal operation means includes a first cylindrical body integrally formed on one of the transmission shafts and having a protruding piece formed toward the other transmission shaft. A second cylindrical body integrally formed with a shaft and having a recess formed therein for engaging the first cylindrical projecting piece in a state of allowing rotation at a predetermined play angle, and an axial direction on the second cylindrical body; The pin comprises a pin which is penetrated in a state capable of moving forward and backward, and an urging spring which urges the pin toward the first cylindrical body, wherein the tip end portion of the first cylindrical body is freely retractable. The first and second cylindrical bodies are in a power-off state based on the fact that the tip end of the pin has withdrawn from the fitting groove against the urging force of the elastic machine. Relative rotation within the range of angle and switching to abnormal posture,
The switch switching means rotates integrally with the second cylinder and is provided so as to be rotatable relative to the first cylinder, and is displaced in conjunction with the first and second cylinders being in the abnormal posture. An electric switchgear for architectural construction configured to switch the detection switch.