JP7429587B2 - Spring breakage detection device - Google Patents

Description

The present invention relates to a spring breakage detection device for detecting breakage of a shaft provided with a balance spring.

Overhead doors are known as fittings that are installed in openings that communicate the outdoors and indoors of buildings such as warehouses and garages. The door body of an overhead door is constructed by connecting multiple panels so that they can rotate in the vertical direction. Wires are connected to both left and right ends of the lowest panel in the width direction. A wire winding mechanism is provided above the wire. By pulling up the left and right wires by the wire winding mechanism from the opening fully closed state, each panel is pulled up from a vertical position to a substantially horizontal position, and the opening is fully opened. The take-up mechanism is equipped with a so-called balance spring, and when the door body is lowered, the load of the door body acting on the balance spring causes the balance spring to be twisted and accumulate force, and when the opening is opened, the force is accumulated. The return force of the applied force acts as a force to wind up the wire, assisting the lifting movement of the door body.

For overhead doors, a door fall prevention device has been proposed that prevents a panel from falling under its own weight when a balance spring is cut. The door fall prevention device restricts the rotation of the shaft by locking the locking claws of the locking member with the locking teeth on the outer periphery of the wheel that rotates together with the shaft when the spring is cut. In addition to this, there are also devices that detect spring breakage using a microswitch and stop the rotational drive of the shaft in response to the detection of spring breakage (Patent Document 1, Patent Document 2).

The detection switch that detects spring breakage detects spring breakage by switching ON and OFF depending on whether the movable element is in contact or not in contact with a movable element that moves in conjunction with the breakage of the spring. In order to increase the reliability of spring breakage detection, it may be necessary to finely adjust the positional relationship between the movable element and the detection switch.

In order to adjust the position of the detection switch, it is necessary to have a mounting structure that allows the position of the detection switch to be adjusted once it is installed, and it is also necessary to be able to adjust the position of the detection switch by removing only the detection switch. However, since the door body fall prevention device is constructed by arranging many components including a detection switch in the limited space of the bracket that supports the shaft, it is necessary to install the door body fall prevention device after installing the door body fall prevention device. Therefore, some ingenuity is required to easily remove only the detection switch.
JP2006-241807 Actual fairness 4-46069

SUMMARY OF THE INVENTION An object of the present invention is to provide a spring breakage detection device that allows easy adjustment of the mounting position.

The technical means adopted by the present invention are:
A shaft rotatably supported by multiple brackets,
a door body that descends when the shaft rotates in a first direction and rises when the shaft rotates in a second direction;
One end side is located and attached to a first side of one of the plurality of brackets, the other end side is attached to the shaft, and is tightened by rotation of the shaft in a first direction. a spring that stores energy and is released when rotated in the second direction;
A detection switch for detecting disconnection of the spring is attached to a second side of the one bracket so that its position can be adjusted.
This is a spring breakage detection device.

In one aspect, the detection switch includes a plate-shaped mounting part, and is fixed to the one bracket via the mounting part with a plurality of screws,
A plurality of female screws into which the screws can be screwed are formed in the one bracket,
A plurality of insertion holes are formed in the mounting portion so as to correspond to the plurality of female screws,
The size of the insertion hole is larger than the diameter of the shaft of the screw and the female screw,
The detection switch is attached to the one bracket by a screw that is adjusted in position within a gap between the shaft portion and the insertion hole, and is inserted through the insertion hole and screwed into the female screw.
In one embodiment, the detection switch and the mounting plate form a detection switch assembly;
The mounting plate includes a portion that serves as the mounting portion and a portion to which the detection switch is fixed,
The detection switch is adjustable in position on the one bracket as a detection switch assembly.

In one aspect, an actuating body is provided that is located on the second side of the one bracket and is displaced in conjunction with cutting of the spring,
Normally, the detection switch is in contact with the operating body, and when the spring is disconnected, the operating body is displaced and the detection switch is brought out of contact, thereby detecting spring breakage.

In one aspect, a cylindrical body to which one end side of the spring is attached is located on a first side of the one bracket, the cylindrical body is fixed to the actuating body, and the cylindrical body and the actuating body are fixed to each other. The body is rotatably mounted to said one bracket.

In one aspect, a locking device is provided on a second side of the one bracket to restrict rotation of the shaft in the first direction when the spring is cut;
The locking device includes a plurality of locked parts on the outer periphery, a wheel that rotates integrally with a shaft, and a rotational locking member that can be locked to the locked parts,
The rotation locking member is rotatable between a non-locking position and a locking position, and a distal end thereof is biased in a direction to rotate forward and lock the locked portion,
The operating body is in contact with the rotation lock member in the unlocked position and holds the rotation lock member in the unlocked position by the biasing force of the spring,
When the spring is disconnected, the force that holds the rotation locking member in the unlocked position is lost, and the rotation locking member locks with the locked portion to restrict rotation of the shaft in the first direction. do.

In one aspect, the one bracket includes:
a mounting base that includes a rear surface portion and left and right side surface portions rising forward from widthwise ends of the rear surface portion, and is fixed to the frame via the rear surface portion;
A bracket main body that is inserted from the front into a space between the left and right side portions of the mounting base, with its rear side portion located in the space, and attached to the mounting base in a manner that it extends forward;
Consisting of
One of the left and right side surfaces of the bracket main body has a larger rising dimension than the other side surface, and the one side surface includes a portion extending forward beyond the front end of the other side surface,
The spring is located on the first side (outside) of the portion of the one side surface, and the detection switch includes an insertion hole through which a screw is inserted with a clearance. It is attached by screwing a screw into a female screw provided in the portion of the portion from the second side (inside).
Since there is a space on the second side (inside) of the part of the one side surface of the bracket main body (the other side surface does not extend that far), it is possible to tighten, loosen, or remove the screw. .
On the first side (outside) of the part of the one side surface of the bracket main body, there is no need to tighten a bolt for attaching a screw, and there is an element (such as a cylindrical body or a spring) located on the first side of the part. The screw tightening/loosening work or the screw attachment/detachment work can be performed on the second side (inner side) without being affected by this.
In one aspect, when the bracket main body is fixed to the mounting base, the rear face part of the mounting base and the rear face part of the bracket main body are spaced apart from each other and face each other, and the detection is performed using a space between the rear face parts. The switch may be wired, and in this case, the wire may be passed through an opening formed in the rear surface of the bracket body.

In the present invention, by making the mounting position of the detection switch adjustable, it is possible to improve the reliability of spring breakage detection.
When installing a detection switch using screws, by providing a female screw on the surface of the bracket, the mounting position of the detection switch can be adjusted by tightening, loosening, or removing the screw from one side of the bracket surface. possible.

FIG. 2 is a front view of the overhead door in a fully closed position, seen from the inside of the room. FIG. 3 is a side view of the overhead door in a fully closed position. FIG. 2 is a plan view and a front view of the winding mechanism of the overhead door according to the present embodiment. FIG. 2 is an exploded perspective view (the shaft is omitted) of the door fall prevention device according to the present embodiment. FIG. 2 is a plan view of the door fall prevention device according to the present embodiment. FIG. 2 is a side view of a bracket that rotatably supports a shaft and to which a balance spring is attached. FIG. 2 is a plan view of a bracket that rotatably supports a shaft and to which a balance spring is attached. FIG. 3 is a front view of a bracket that rotatably supports a shaft and to which a balance spring is attached. FIG. 2 is a plan view, a front view, and a side view of a mounting base that constitutes a bracket. They are a top view, a top view, a front view, and a side view of a bracket main body that constitutes the bracket. It is a perspective view of an operating body. They are a side view, a top view, and a front view of a rotation lock member. FIG. 3 is a side view and a cross-sectional view of the wheel. It is a side view and sectional view of the wheel provided with the boss concerning other embodiments. FIG. 2 is a side view and a cross-sectional view of a plate-like element that constitutes a wheel. FIG. 2 is a side view and a cross-sectional view of a boss that constitutes a wheel. FIG. 7 is a side view and a sectional view of a boss according to another embodiment. FIG. 6 is a side view and a cross-sectional view of a wheel according to another embodiment. It is a side view and sectional view of the plate-like element which constitutes the wheel concerning other embodiments. FIG. 3 is a side view of the fall prevention device, showing a non-operating state of the fall prevention device and the spring breakage detection device. FIG. 3 is a side view of the fall prevention device, showing the operating state of the fall prevention device and the spring breakage detection device. It is a side view of a fall prevention device (inactive state), and is a figure which emphasizes an operating body and a spacer. FIG. 2 is a cross-sectional view of the fall prevention device (inactive state), with the operating body and spacer emphasized. The left diagram shows the behavior of the rotation locking member of the locking device according to the comparative example from the unlocked state to the locked state, and the right diagram shows the behavior of the rotational locking member of the locking device according to the present embodiment. It is a figure which shows the behavior from an unlocked state to a locked state. FIG. 22B is a partially enlarged view of FIG. 22(B-2). FIG. 22B is a partially enlarged view of FIG. 22(B-3). The left diagram shows the behavior of the rotation locking member according to the first embodiment from the unlocked state to the locked state, and the right diagram shows the behavior of the rotation locking member according to the second embodiment in the unlocked state. It is a figure which shows the behavior until it becomes a lock state. FIG. 23B is a partially enlarged view of FIG. 23(B-2). It is a figure explaining the reverse rotation prevention mechanism by the rotation lock member based on 2nd Embodiment. FIG. 24B is a partially enlarged view of FIG. 24(B-2). It is a figure which shows a detection switch assembly. FIG. 3 is a diagram showing a detection switch main body constituting the detection switch assembly. It is a figure which shows the mounting plate which comprises a detection switch assembly. It is a figure explaining attachment of a detection switch assembly to a bracket. It is a figure explaining the attachment position adjustment of the detection switch assembly with respect to a bracket. It is a top view explaining the installation process of a winding mechanism. It is a front view explaining the installation process of a winding mechanism. They are a plan view, a front view, and a side view showing a mounting base fixed to a frame. FIG. 7 is a plan view, a front view, and a side view showing the bracket body attached to the mounting base (a state in which it is inserted most deeply into the mounting base).

[A] Overall configuration of overhead door FIG. 1 is a front view of the overhead door in a fully closed position as seen from the indoor side, and FIG. 2 is a side view of the overhead door. The door body of the overhead door is constructed by connecting a plurality of horizontally rectangular panels P so as to be rotatable with each other in the vertical direction.

Roller brackets are provided at both left and right ends of each panel P in the width direction, and the door body is guided by guide rollers of the roller brackets at both left and right ends of each panel P on guide rails G provided on the left and right sides of the opening. Open and close the opening by rising and falling while moving.

As shown in FIG. 2, the guide rail G includes a first portion _G1 extending in the height direction of the opening, and a curved second portion G extending rearward from above the first portion _G1 toward the indoor side. ₂ , and a third portion _G3 extending rearward from the rear of the _second portion G2 along the ceiling. The first portion _G1 is gently inclined toward the indoor side from the bottom to the top. The third portion _G3 is gently inclined upward toward the indoor side.

When the opening is fully closed, each panel P is positioned at the first portion _G1 of the guide rail G, so that the plurality of panels P assume a vertical posture and close the opening. A wire W is connected to both left and right ends in the width direction of the lowest panel P, and a winding mechanism 1 for the wire W is provided above the opening. By simultaneously pulling up the left and right wires W from the opening fully closed state by the wire W winding mechanism 1, each panel P is pulled up from the vertical position to the almost horizontal position located at the third portion _G3 , and the opening is closed. The section will be fully open. The winding mechanism 1 includes a so-called balance spring (a first spring 6A and a second spring 6B described later), and when the door body is lowered, the balance spring is twisted by the load of the door body acting on the balance spring. When the opening is opened, the return force of the stored force acts as a force to wind up the wire W, thereby assisting the upward movement of the door body. The overhead door may be a manual type or an electric type, but in this embodiment, it is an electric type.

[B] Wire winding mechanism The wire winding mechanism 1 has left and right winding drums 1A and 1B located above both ends in the width direction of the opening, and left and right winding drums 1A and 1B that can rotate integrally and synchronously. It is equipped with a rotating mechanism. As shown in FIG. 3, the rotation mechanism according to the present embodiment includes two first shafts 2A and two second shafts 2B that are connected in series in the opening width direction. One end portions are integrally rotatably connected to each other via a joint 20, and the other end portions of the first shaft 2A and second shaft 2B rotate integrally with the left and right winding drums 1A and 1B, respectively. possible to be connected. In this embodiment, the rotation mechanism is equipped with two shafts, but the number of shafts may be one or more, depending on the opening width dimension, the weight of the door body, etc., or three or more shafts can be rotated together. They may be connected in such a way that

One longitudinal end of the first shaft 2A is rotatably supported by a bracket 3A, and the other end is rotatably supported by a bracket 4A. One longitudinal end of the second shaft 2B is rotatably supported by a bracket 3B, and the other end is rotatably supported by a bracket 4B. The brackets 3A, 3B, 4A, and 4B are fixed to the frame body at predetermined intervals in the width direction of the opening, respectively, and the brackets 3A, 4A cover both ends of the first shaft 2A in the length direction. The brackets 3B and 4B respectively rotatably support (by bearings) both ends of the second shaft 2B in the length direction. In the illustrated embodiment, the brackets 4A, 4B are L-shaped in plan view, but the shape of the brackets 4A, 4B is not limited. The structure of the brackets 3A and 3B will be described later.

Above both ends of the opening, brackets 5A and 5B are each fixed to the frame in a corbelled manner. The first winding drum 1A is rotatably supported (by a bearing) between a bracket 4A and a bracket 5A. The second winding drum 1B is rotatably supported (by a bearing) between a bracket 4B and a bracket 5B. In the illustrated embodiment, the brackets 5A and 5B are L-shaped in plan view, but the shape of the brackets 5A and 5B is not limited.

A first coil spring 6A is externally mounted on the first shaft 2A, and one end of the first coil spring 6A is connected to the outer surface of the first cylindrical body 60 connected to the bracket 3A by being wound around the outer surface of the first cylindrical body 60. The other end of the coil spring 6A is wound around and connected to the outer surface of a second cylindrical body 61 that rotates together with the first shaft 2A, and the second shaft 2B is equipped with a second coil spring 6B. One end of the second coil spring 6B is wound around and connected to the outer surface of the first cylindrical body 60 connected to the bracket 3B, and the other end of the second coil spring 6B is a second coil spring 6B that rotates integrally with the second shaft 2B. It is connected by being wrapped around the outer surface of the cylindrical body 61.

When the door body is lowered, the weight of the door body acts on the wire W, and the rotation of the first winding drum 1A and the second winding drum 1B causes the first shaft 2A and the second shaft 2B to move in the first direction. However, at this time, as the first shaft 2A rotates in the first direction, the first coil spring 6A is twisted and tightened, accumulating force, and the second shaft 2B As the second coil spring 6B rotates in the first direction, the second coil spring 6B is twisted and tightened, thereby accumulating power. When the opening is opened, the first coil spring 6A and second coil spring 6B, which are wound and stored, are released, and the return force of the springs rotates the first shaft 2A and second shaft 2B in the second direction. This acts to wind up the wire W, thereby assisting the raising operation of the door body.

[C] Door fall prevention device [C-1] Background In this embodiment, a first coil spring 6A and a second coil spring 6B are provided corresponding to the two first shafts 2A and the second shaft 2B, respectively. However, the spring forces of the first coil spring 6A and the second coil spring 6B are set so that the spring force of the first coil spring 6A and the second coil spring 6B is combined to balance the weight of the door body. , when at least one of the second coil springs 6B breaks, the balance between the door body's own weight and spring force is disrupted (the force of its own weight becomes relatively large with respect to the total spring force), and the door body pulls the wire W. It will fall (suddenly descend) while being pulled out. The overhead door according to this embodiment is equipped with a door fall prevention device that prevents the door from falling suddenly when the balance spring breaks, and a spring breakage detection device that detects when the balance spring breaks. (See Fig. 4, Fig. 5, Fig. 18, Fig. 19, etc.).

The door fall prevention device and the spring breakage detection device are provided corresponding to each shaft and each balance spring, that is, the first shaft 2A and the first coil spring 6A, and the second shaft 2B and the second coil spring 6B. That is, the overhead door according to this embodiment includes two door fall prevention devices and two spring breakage detection devices. In this embodiment, the door fall prevention device and spring breakage detection device corresponding to the first shaft 2A and the first coil spring 6A are provided on the bracket 3A, and the device corresponding to the second shaft 2B and the second coil spring 6B is provided on the bracket 3A. The door fall prevention device and the spring breakage detection device are provided on the bracket 3B (see FIGS. 3, 30, and 31). The brackets 3A and 3B are also part of the door drop prevention device and the spring breakage detection device. In this specification, the door fall prevention device and the spring breakage detection device that correspond to the first shaft 2A and the first coil spring 6A will be mainly explained. It can be applied to a door fall prevention device and a spring breakage detection device corresponding to the above.

[C-2] Bracket configuration The bracket 3A that rotatably supports one end of the first shaft 2A and the bracket 3B that rotatably supports one end of the second shaft 2B are both fixed to the frame 13. It consists of a stand 30 and a bracket main body 31 fixed to the mounting stand 30. A bracket 3A is shown in FIGS. 4-8. The brackets 3A and 3B have substantially the same configuration except that the bracket main body 31 is attached oppositely. By inverting the bracket body 31 of the bracket 3A vertically and horizontally, it becomes the bracket body 31 of the bracket 3B. Therefore, the following description regarding the mounting base 30 and the bracket body 31 is common to both brackets. Moreover, regarding the description with reference to the first shaft 2A, by replacing the first shaft 2A with the second shaft 2B, the description can be used as the description of the bracket 3B.

As shown in FIG. 9, the mounting base 30 has a U-shape in plan view from a rear surface portion 300 and left and right side portions 301 and 302 that are formed to rise forward from both ends of the rear surface portion 300 in the width direction. The rear surface portion 300 serves as a mounting surface to the frame, and the left and right side portions 301 and 302 serve as mounting surfaces for the bracket main body 31. The rear surface part 300 has a vertical rectangular shape, and two mounting holes (vertical elongated holes) 3000 are formed at intervals in the height direction, and the rear surface part 300 and left and right side surfaces 301 and 302 are in a vertical position. The rear surface portion 300 is brought into contact with the frame 13 and fixed to the frame 13 with a fastening member (anchor bolt 305 in this embodiment) passing through the attachment hole 3000 (see FIGS. 30 to 32).

The space between the left and right side parts 301, 302 is an insertion space for the rear side part of the bracket main body 31, and the bracket main body 31 is inserted into this space, and the bracket main body 31 is inserted into the left and right side parts 301, 302. It is designed to be fixed to Attachment holes (horizontal holes) 3010, 3010 are formed at the upper and lower sides of the side surface portion 301 in the height direction. Attachment holes (horizontal holes) 3020, 3020 are formed at the upper and lower sides of the side surface portion 302 in the height direction. In the embodiment shown in FIG. 9, the mounting holes 3010, 3020 are provided on the front side of the side parts 301, 302 (the side away from the rear part 300), but the width dimension (rising dimension) of the left and right side parts 301, 302 is is small, the attachment holes 3010, 3020 extend over substantially the entire width of the left and right side portions 301, 302 (see FIG. 32).

A horizontal bent piece 303 is formed at the lower end of the side surface portion 301 toward the inside, located below the lower attachment hole 3010 . The bent piece 303 is located below the space between the side parts 301 and 302 (the insertion space of the rear side portion of the bracket main body 31). In the embodiment shown in FIG. 9, the bent piece 303 is formed on the front side of the side surface part 301, but in the embodiment shown in FIG. It is formed. The bent piece 303 at the lower end functions as a support piece when the bracket main body 31 (which includes the first shaft 2A, a locking device, etc.) is attached, and the function of the bent piece 303 at the lower end will be described later.

A horizontal bent piece 304 is formed inward at the upper end of the side surface portion 302, located above the upper mounting hole 3020. The bent piece 304 is formed above the space between the side parts 301 and 302 (the insertion space of the rear side portion of the bracket main body 31). In the embodiment shown in FIG. 9, the bent piece 304 is formed on the front side of the side surface 302, but in the embodiment shown in FIG. It is formed. The bent piece 304 at the upper end functions as a rotation regulating piece when the bracket main body 31 (which includes the first shaft 2A, a locking device, etc.) is attached, and the function of the bent piece 304 at the upper end will be described later.

The mounting base 30 may be attached to the frame by being upside down from the embodiment shown in FIG. 9, and in this case, the bent piece 303 will be located at the upper end and the bent piece 304 will be located at the lower end. In addition, the edge portions at the tips of the side surfaces 301 and 302 are concave, so that when the mounting base 30 and the bracket body 31 are fixed, there is no escape from the first shaft 2A or the second shaft 2B that is inserted through the bracket body 31. It is designed to be secured.

As shown in FIG. 10, the bracket main body 31 includes a rear surface portion 310 and left and right rising side surfaces 311 and 312 formed to rise forward from both ends of the rear surface portion 310 in the width direction. The rising dimension of the side surface portion 311 is larger than the rising dimension of the side surface portion 312. The rear end side portion of the side surface portion 311 and the side surface portion 312 are opposed to each other. The outer width dimension of the bracket main body 31 (rear surface section 310) is approximately the same as the inner width dimension between the side surface sections 301 and 302 of the mounting base 30, and In the vertical position, the rear end side portion of the bracket main body 31 can be inserted into the internal space of the mounting base 30 from the front. The height dimension of the bracket body 31 is slightly smaller than the height dimension of the mounting base 30, and when the bracket body 31 is inserted into the mounting base 30, the lower end 316 of the bracket body 31 is on the lower side of the mounting base 30. The upper end 317 of the bracket body 31 is located above the bent piece 304 on the upper side of the mounting base 30 . Attachment holes 3110, 3110 are formed in the rear end side of the side surface part 311, located above and below, and mounting holes 3120, 3120 are formed in the side surface part 312, located above and below. Nuts 33 are fixed to the inner surface of the side surface portion 311 in correspondence with the attachment holes 3110 and 3110, and nuts 33 are fixed to the inner surface of the side surface portion 312 in correspondence to the attachment holes 3120 and 3120.

The mounting base 30 and the bracket main body 31 are arranged such that the rear side portion of the bracket main body 31 is inserted between the left and right side faces 301 and 302 of the mounting base 30, and the side faces 301 and 302 of the mounting base 30 are connected to the bracket, respectively. The mounting holes 3110 and 3010 and the mounting holes 3120 and 3020 are in contact with the side surfaces 311 and 312 of the main body 31, respectively. It is fixed by a nut 33). The longitudinal position of the bracket main body 31 with respect to the mounting base 30 can be adjusted in the longitudinal direction within the length of the mounting holes 3010 and 3020, which are horizontally elongated holes. When the bracket body 31 is fixed to the mounting base 30, the rear surface portion 310 of the bracket body 31 and the rear surface portion 300 of the mounting base 30 are spaced apart from each other and face each other (see FIGS. 7 and 33). A circular opening 3100 is formed in the rear surface 310 of the bracket main body 31 so as to face the mounting hole 3000 of the rear surface 300 of the mounting base 30 .

The rising dimension of the side surface portion 311 of the bracket body 31 is larger than the rising dimension of the side surface portion 312, and a portion 311' extending forward beyond the opposing side surface portion 312 is a portion that rotatably supports the shaft 2A. , the portion 311' is provided with an insertion portion 313 for the first shaft 2A, which is provided with a bearing 313'. One end of the first shaft 2A is rotatably supported by an insertion portion 313 of a portion 311' of a side surface 311 of the bracket main body 31, and is inserted into the first cylindrical body 60 and the first coil spring 6A. The end side is rotatably supported by the bracket 4A.

The first cylindrical body 60 to which one end side of the first coil spring 6A is fixed is attached to the outside of the portion 311' of the side surface 311 of the bracket main body 31. The cylindrical body 60 and the actuating body 7 located inside the portion 311' of the side surface 311 of the bracket body 31 are connected with bolts 74 so as to sandwich the portion 311' of the side surface 311 of the bracket body 31. Two openings 314 are formed in the portion 311' of the side surface portion 311 at the top and bottom so as to sandwich the insertion portion 313 of the first shaft 2A, and the bolt 74 connecting the actuating body 7 and the first cylindrical body 60 is , is inserted through the opening 314.

[C-3] Actuator The actuator 7 is a movable plate that operates when the balance spring (first coil spring 6A, second coil spring 6B) is disconnected. At this time, the door fall prevention device and spring breakage detection device are activated.

As shown in FIG. 11, the actuating body 7 is a generally diamond-shaped plate having a first inclined side 700, a second inclined side 701, a third inclined side 702, and a fourth inclined side 703. More specifically, an edge 704 is formed between the first inclined side 700 and the second inclined side 701, and an edge 705 is formed between the third inclined side 702 and the fourth inclined side 703. An edge 706 is formed between the first inclined side 700 and the third inclined side 702, and an edge 707 is formed between the second inclined side 701 and the fourth inclined side 703. has been done. Edges 704 and 705 are opposite to each other, edges 706 and 707 are opposite to each other, and the dimension between edges 706 and 707 is greater than the dimension between edges 704 and 705. It's also big. Note that the shape of the actuating body 7 is not limited to that shown in the drawings.

An insertion hole 71 through which the first shaft 2A is inserted is formed in the center of the surface portion 70 of the actuating body 7, and elongated attachment holes 72, 72 are formed on both sides of the insertion hole 71. The insertion hole 71 has a diameter larger than the bearing 313' provided on the side surface 311 of the bracket main body 31 so as not to interfere with the bearing 313'. A bent piece 73 is formed on the first inclined side 700 at a position closer to the end edge 706 side, and a bent piece 73 is formed on the second inclined side 701 at a position closer to the end edge 707 side. There is. The bent piece 73 normally functions as a rotation restriction piece that restricts the rotation of the rotation locking member 8 and a rotation restriction piece of the lever 111 of the spring breakage detection switch 11 (see FIG. 18).

In this embodiment, the actuating body 7 is attached in a posture extending in the height direction (the edge 706 is on the upper side and the edge 707 is on the lower side), and the width dimension of the surface part 70 is the largest at the center part in the height direction. , the width gradually decreases toward the upper and lower ends. The insertion hole 71 is located at the center in the height direction of the surface portion 70 of the actuating body 7, and the upper bent piece 73 functions as a rotation regulating piece. The actuating body 7 according to the present embodiment has the bent pieces 73 formed on the top and bottom, so that when the actuating body 7 is installed on the left and right brackets 3A and 3B, the vertical and horizontal sides can be reversed. This can be handled by the operating body 7.

A first shaft 2A is rotatably supported on a side surface 311 of the bracket main body 31, and a first cylindrical body 60 to which one end of the first coil spring 6A is attached is positioned outside the side surface 311. However, the first cylindrical body 60 is fixed and integrated with the actuating body 7 located inside the side part 311, and the first shaft 2A is connected to the hollow part of the first cylindrical body 60 and the actuating body 7. It is rotatably inserted through the insertion hole 71 of. The first cylindrical body 60 is not directly fixed to the side surface 311 of the bracket main body 31, but is fixed to the actuating body 7, and the first cylindrical body 60 and the actuating body are integrated. 7 is movably (rotatably) attached to the side surface 311.

More specifically, as shown in FIG. 4, a female screw 75 is formed on the end surface 600 of the first cylindrical body 60, and the female screw 75 and the opening 314 formed in the side surface 311 connect to each other. The mounting holes 72 formed in the surface portion 70 of the body 7 are aligned with each other, and a screw (bolt) 74 is inserted into the mounting hole 72 and the opening 314 from the inside of the side surface portion 311 toward the outside, and the screw 74 is screwed into a female thread. By fixing to 75, the actuating body 7 and the first cylindrical body 60 are connected and integrated.

In the present embodiment, a ring-shaped spacer 62 is provided in the side surface 311 with play in the opening 314, and a screw 74 connecting the first cylindrical body 60 and the actuating body 7 is provided. The shaft portion of the shaft passes through the spacer 62 (FIGS. 4, 20, and 21). As shown in FIG. 21, the thickness of the spacer 62 is slightly larger than the thickness of the side part 311, one surface of the spacer 62 is in contact with the surface part 70 of the actuating body 7, and the other surface of the spacer 62 is in contact with the surface part 70 of the actuating body 7. 1 is in contact with an end surface 600 of the cylindrical body 60. The opening 314 has a substantially isosceles trapezoidal shape with inclined sides 3140, 3140. The upper opening 314 and the lower opening 314 have vertically symmetrical shapes, and the upper opening 314 has an inverted trapezoid shape. In the upper and lower openings 314, one inclined side is located on the rear side (the side closer to the rear surface part 310), and the other inclined side is located on the front side (the side farther from the rear surface part 310). The distance between the inclined sides 3140 is larger than the outer dimensions of the spacer 62. In the embodiment shown in FIG. 18, the actuating body 7 is in the first posture, the upper spacer 62 is in contact with the rear inclined side 3140 of the upper opening 314, and the lower spacer 62 is in contact with the lower inclined side 3140. It is in contact with the inclined side 3140 on the front side of the opening 314. In the embodiment shown in FIG. 19, the actuating body 7 is in the second attitude, the upper spacer 62 is in contact with the front inclined side 3140 of the upper opening 314, and the lower spacer 62 is in contact with the front inclined side 3140 of the upper opening 314. It is in contact with the inclined side 3140 on the rear side of 314. That is, the spacer 62 can restrict the movable range (rotation range) of the actuating body 7.

The actuating body 7 and the first cylindrical body 60 are connected by a screw 74 and are integrated, and the first cylindrical body 60 and the actuating body 7 are connected to a first coil fixed to the outer peripheral surface of the first cylindrical body 60. The rotation locking member 8 is biased by the spring 6A in a direction (in the direction of the arrow in FIG. 18) to rotate the rotation locking member 8 from the second attitude (locked attitude) to the first attitude (unlocked attitude). When the first coil spring 6A is disconnected, the force acting in the direction of rotating the rotation locking member 8 from the second posture to the first posture is released, and the first cylindrical body 60 and the actuating body 7 become free. Due to the biasing force of the torsion spring 10, the rotation locking member 8 instantly rotates from the first attitude to the second attitude (at the same time, the actuating body 7 rotates from the first attitude to the second attitude). , is locked to a locked portion on the outer periphery of the wheel 9 to restrict rotation of the first shaft 2A and the second shaft 2B in the first direction.

[C-4] Locking device [C-4-1] Overview In a door device in which the door body is lowered by rotation of the shaft in the first direction and raised by rotation in the second direction, the door body is prevented from falling. The door fall prevention device for preventing (sudden descent) includes a lock device that restricts rotation of the shaft in the first direction when the spring is disconnected. The lock device provided on the bracket 3A includes a rotation locking member 8 that rotates in the locking direction (locking direction) when the rotation restriction state due to the rotation of the actuating body 7 is released when the first coil spring 6A is disconnected. , a wheel 9 that rotates integrally with the first shaft 2A and has a plurality of locked parts on the outer periphery, and in an emergency when the first coil spring 6A is cut, the first shaft 2A (and The second shaft 2B) attempts to rotate in the first direction, but the rotation locking member 8 instantly locks onto the locked portion of the wheel 9 in response to the spring disconnection, and the first shaft 2A (and the second shaft 2B) attempts to rotate in the first direction. 2 shaft 2B) in the first direction.

[C-4-2] Rotation lock member As shown in FIG. 12, the rotation lock member 8 according to the present embodiment includes a surface portion 80, and side portions 81 and 82 rising from the widthwise ends of the surface portion 80. An opening 83 formed in the surface portion 80 is provided. A distal end 800 of the surface portion 80 serves as a locking portion, and the proximal ends of the side portions 81 and 82 serve as rotating base end portions extending beyond the rear end 801 of the surface portion 80 . Insertion holes 84 are formed in the side parts 81 and 82 so as to face each other.

A support shaft 315 of the rotation locking member 8 is provided on the rear side of the bracket body 31 (between the proximal end of the rear end of the side surface 311 and the side surface 312). A rotating base end portion is rotatably connected to a support shaft 315. A torsion spring 10 as a biasing means is provided on the proximal end side of the rotation locking member 8, and the rotation locking member 8 is configured such that the distal end thereof protrudes forward (in the direction away from the rear surface portion 310). energized. In the illustrated embodiment, the winding of the spring 10 is sheathed on the support shaft 315, one end is locked to the proximal end portion of the surface portion 80 of the rotation locking member 8, and the other end is secured to the rear surface portion 310 of the bracket body 31. It touches the inside.

As shown in FIG. 10, in a side view of the bracket main body 31, the rotation locking member 8 according to the present embodiment has a distal end on the upper side, a proximal end on the lower side, and a distal end on the front side (the side far from the rear surface part 310). It is attached to the support shaft 315 on the rear side of the bracket main body 31 in an inclined position with the base end on the rear side (the side closer to the rear face part 310). The distal end portion of the rotation locking member 8 is located forward of the front end of the side surface portion 312.

The rotation locking member 8 has a first position, that is, a non-locking position (see FIGS. 6 and 18), in which the tip is located relatively on the rear side (closer to the rear surface part 310), and a first position, that is, a non-locking position (see FIGS. It is possible to rotate between the second posture, that is, the lock posture (see FIG. 19) located on the side far from the surface portion 310, and the direction in which it is rotated from the first posture to the second posture by the torsion spring 10. is energized by In FIG. 6, the rotation locking member 8 restricts rotation against the biasing force of the torsion spring 10 by inserting a pin 85 as a stopper into the insertion hole 84 in the first posture. Maintains posture. This pin 85 is used when necessary (such as during inspection) other than when the door device (overslider) is used, and the pin 85 is not used during use.

When the locking device is installed, the bent piece (rotation regulating piece) 73 of the actuating body 7 comes into contact with the rotation locking member 8, resisting the biasing force of the torsion spring 10, and bending the tip of the rotation locking member 8. The first posture is maintained by pushing the side toward the rear surface portion 310 side. When the first coil spring 6A is disconnected, the force acting in the direction of rotating the rotation locking member 8 from the second posture to the first posture (in the direction of the arrow in FIG. 18) is released, and the first cylindrical body 60 and the actuating force are released. When the body 7 becomes free, the rotation locking member 8 instantly rotates from the first position to the second position due to the biasing force of the torsion spring 10, and is engaged with the locked portion on the outer periphery of the wheel 9. The rotation of the first shaft 2A (and the second shaft 2B) in the first direction is restricted.

[C-4-3] Wheel The wheel 9 provides a locked portion to which the rotational locking member 8 of the locking device locks (see FIGS. 19 and 22 to 24). The wheel 9 is configured to rotate integrally with the first shaft 2A, and when the spring is cut, the rotation locking member 8 in the first position rotates to the second position and engages the locked portion of the wheel 9. By stopping, rotation of the first shaft 2A in the first direction is restricted. The wheel 9 according to the present embodiment has a plate shape in which a boss 90 for receiving the first shaft 2A, convex portions 910 and concave portions 911 are alternately formed in the circumferential direction on the outer periphery, and an opening 912 for receiving the boss 90 is formed. element 91, and rotates integrally with the shaft 2A. 13 to 15 show the wheel 9 according to the first embodiment, and FIGS. 16 and 17 show the wheel 9 according to the second embodiment.

As shown in FIGS. 13 and 14, the plate element 91 of the wheel 9 according to the first embodiment has a substantially pentagonal shape in side view. More specifically, on the outer periphery of the plate element 91, five protrusions 910 and five recesses 911 are formed alternately and continuously in the circumferential direction. Each convex portion 910 has a circumferential dimension L1, and each concave portion 911 has a circumferential dimension L2. In other words, on the outer periphery of the wheel 9, a plurality of convex portions 910 are formed at predetermined intervals (L2) in the circumferential direction, and a concave portion 911 is formed between the convex portions 910 adjacent to each other in the circumferential direction. . The circumferential dimension L2 of each concave portion 911 is larger than the circumferential dimension L1 of each convex portion 910.

As shown in FIG. 14, the convex portion 910 includes an upper surface 914 and side surfaces 915, 915 on both sides in the circumferential direction. The upper surface 914 is a slightly bulging curved surface. The recess 911 has a flat bottom surface 916, and the side surfaces 915 of the protrusion 910 also serve as side surfaces 915, 915 on both circumferential sides of the recess. A side portion of each convex portion 910 (including the side surface 915 and the connection portion between the lower end of the side surface 915 and the bottom surface 916) is a locked portion. The side surfaces 915, 915 extend approximately perpendicularly to the bottom surface 916, but in this embodiment, as shown in FIG. It is formed from a continuous curved surface. In this embodiment, as shown in FIG. 22B, the connecting portion between this curved surface and the bottom surface 916 also forms a locked portion.

As shown in FIG. 14, the plate element 91 has an opening 912 in the center, and a part of the inner peripheral surface 913 of the opening 912 is a flat surface 913'. The plate element 91 includes a first surface 91A and a second surface 91B. As shown in FIG. 15, a part of the outer circumferential surface 900 of the boss 90 is a flat portion 900'. The first shaft 2A is inserted into the hollow part 901 of the boss 90 and fixed therein, so that the boss 90 and the first shaft 2A rotate together.

The outer circumferential surface 900 of the boss 90 and the inner circumferential surface 913 of the opening 912 of the plate-like element 91 allow the boss 90 to be inserted into the opening 912. The inner circumferential surfaces 913 of are in contact with or close to each other over the entire circumference. In this inserted state, the outer circumferential surface 900 of the boss 90 and the inner circumferential surface 913 of the opening 912 of the plate-like element 91 have a shape that allows circumferential force to be transmitted to each other (a shape that allows the boss 90 and the plate-like element 91 to rotate integrally). )have.

In this embodiment, the outer circumferential surface 900 of the boss 90 and the inner circumferential surface 913 of the opening 912 of the plate-like element 91 have an occluded circular shape with at least one flat portion 900', 913' on a part of the circumferential surface. (FIGS. 14 and 15), when the boss 90 is received in the opening 912 of the plate element 91, the flat part 900' and the flat part 913' are in contact with or are close to each other, and the boss 90 and the plate element 91 are in contact with each other or are close to each other. It is designed to rotate as one unit. The shape of the outer circumferential surface 900 of the boss 90 and the shape of the inner circumferential surface 913 of the opening 912 of the plate-like element 91 are not limited to the shape of a missing circle, but may have a shape other than a perfect circle, such as a polygon (triangle). , quadrangle, pentagon, . . . ), an ellipse, or a part of a perfect circle with a concave portion formed therein (a shape similar to the inner peripheral surface of the boss 90).

When the boss 90 is inserted into the opening 912 of the plate element 91, a first corner is formed by the outer peripheral surface 900 of the boss 90 and the first surface 91A of the plate element 91, and the outer peripheral surface 900 of the boss 90 A second corner is formed by the second surface 91B of the plate-like element 91. In this embodiment, only the first corner is fillet welded 92 . In this embodiment, the shape of the outer circumferential surface 900 of the boss 90 and the inner circumferential surface 913 of the opening 912 of the plate-like element 91 is selected (a shape that allows circumferential force to be transmitted to each other, or a shape in which the boss 90 and the plate-like element 91 are integrated). The combination of the rotatable shape) and the fillet weld 92 on one side ensures sufficient strength to withstand the impact when the rotation locking member 8 is locked to the locked portion of the wheel 9. .

FIG. 15A shows a boss 90' according to another embodiment, and FIG. 13A shows a wheel 9 with the boss 90' shown in FIG. 15A. The plate-like element 91 in FIG. 13A is the same as the plate-like element 91 according to FIGS. 13 and 14, and the description of the plate-like element 91 according to FIGS. 13 and 14 can be referred to. The outer circumferential surface of the boss 90' shown in FIG. 15A consists of a first portion 900A having a first outer diameter and a second portion 900B having a second outer diameter larger than the first outer diameter. , a rising surface 900C is formed in the stepped portion between the first portion 900A and the second portion 900B. A portion of the first portion 900A of the outer peripheral surface of the boss 90' is a flat portion 900A', and a portion of the second portion 900B is a flat portion 900B'. The first portion 900A of the outer circumferential surface of the boss 90' and the inner circumferential surface 913 of the opening 912 of the plate element 91 allow the boss 90' to be inserted into the opening 912, and in the inserted state, the rising surface 900C of the boss 90' and The attachment position of the plate element 91 to the boss 90' is determined by the contact between the second surface 91B of the plate element 91 and the second surface 91B of the plate element 91. In the inserted state, the first portion 900A of the outer circumferential surface of the boss 90' and the inner circumferential surface 913 of the opening 912 of the plate element 91 are in contact with or close to each other over the entire circumference, and the first portion 900A of the outer circumferential surface of the boss 90' The inner circumferential surface 913 of the opening 912 of the portion 900A and the plate-like element 91 has a shape that allows circumferential force to be transmitted to each other (a shape that allows the boss 90' and the plate-like element 91 to rotate integrally). When the plate element 91 is positioned relative to the boss 90', a first corner 900A of the outer peripheral surface of the boss 90' and a first surface 91A of the plate element 91 is formed, and the boss 90 A second corner is formed by the second portion 900B of the outer circumferential surface of ' and the second surface 91B of the plate-like element 91, and in this embodiment, only the first corner is fillet welded 92. In the embodiment shown in FIGS. 13A and 15A, when the boss 90 is received in the opening 912 of the plate element 91, the rising surface 900C formed on the outer peripheral surface of the boss 90' and the second surface 91B of the plate element 91 By abutting, the mounting position of the plate-like element 91 with respect to the boss 90' is determined, and the welding work can be performed in the positioned state, and the assembly work efficiency (positioning, welding) of the wheel 9 can be improved. The boss 90' is characterized in that it includes a contact surface (rising surface 900C) that enables positioning of the plate element 91 with respect to the boss 90' by abutting the second surface 91B of the plate element 91. The shape of the second portion 900B of the outer periphery is not limited as long as the second portion 900B has such a contact surface, and for example, the flat portion 900B' may not be provided. In addition, in the illustrated embodiment, the stepped portions of the first portion 900A and the second portion 900B, which have different outer diameters, serve as contact surfaces, but the first portion and the second portion of the outer circumferential surface have the same outer diameter, and A flange or ring-shaped convex portion having an abutting surface may be provided protrudingly between the first portion and the second portion. Further, the contact surface is not limited to one that is formed continuously in the outer circumferential direction, but may be a plurality of contact surfaces that protrude at intervals in the outer circumferential direction.

As shown in FIGS. 16 and 17, the plate element 91 of the wheel 9 according to the second embodiment has a substantially rectangular shape in side view. More specifically, four convex portions 910 and four concave portions 911 are continuously and alternately formed in the circumferential direction on the outer periphery of the plate-like element 91. As shown in FIG. 17, the convex portion 910 includes an upper surface 914 and side surfaces 915, 915 on both sides in the circumferential direction, and a locked portion is formed from the side surface 915 of each convex portion 910. The upper surface 914 is a slightly bulging curved surface. The recess 911 has a flat bottom surface 916, and the side surfaces 915 of the protrusion 910 also serve as side surfaces 915, 915 on both circumferential sides of the recess. Side surfaces 915, 915 extend substantially perpendicular to bottom surface 916. The circumferential dimension L2' of each concave portion 911 is larger than the circumferential dimension L1' of each convex portion 910. The wheel 9 according to the first embodiment and the wheel 9 according to the second embodiment are substantially the same except for the number of protrusions 910 and recesses 911 and the circumferential dimension. The description of the wheel 9 can be cited.

[C-4-4] Operation of the locking device Referring to FIGS. 22 to 24, a lock in which the rotating locking member 8 in the unlocked state (non-latching position) is locked to the locked portion of the wheel 9 The behavior of the rotation locking member 8 until it reaches the state (locking position) will be explained. (A-1) to (A-4) on the left side of FIG. 22 show the behavior of the rotation locking member 8 with respect to the wheel 9' according to the comparative example. (B-1) to (B-3) on the right side of FIG. 22 show the behavior of the rotation locking member 8 with respect to the wheel 9 according to the first embodiment. The embodiment on the left and the embodiment on the right differ only in the configurations of the wheels 9 and 9', and the rotation locking member 8 is common. Note that the opening 83 is not provided in the surface portion 80 of the rotation locking member 8.

In the embodiment on the left side of FIG. 22, the wheel 9' has six convex parts 910' and six concave parts 911' formed alternately in the circumferential direction, and the circumferential dimension of each convex part 910' and each concave part 911 The circumferential dimensions of ' are approximately the same. In the embodiment on the left side of FIG. 22, when the spring is disconnected, the wheel 9' starts rotating in the direction of the arrow, and the rotation locking member 8 is released from rotation restriction and starts rotating in the direction of the arrow. As shown in (A-1), when the rotation locking member 8 starts rotating, the distance between the tip of the surface portion 80 of the rotation locking member 8 and the nearest convex portion 910' is relatively short; As shown in -2), there is a risk that the inner surface of the surface portion 80 may ride on the convex portion 910' without the rotation locking member 8 being engaged with the convex portion 910' (so-called tooth skipping). be. In this case, as shown in (A-3) and (A-4), the wheel 9' continues to rotate until it locks on the next convex portion 910', so the shaft rotates in the first direction by that amount. The door body will fall.

In the embodiment on the right side of FIG. 22, compared to the embodiment on the left side, the number of convex portions and concave portions is reduced, and the circumferential dimension of each concave portion 911 is made larger than the circumferential dimension of each convex portion 910. , while maintaining the strength of the protrusion 910, the circumferential dimension of the recess 911 is increased. In the embodiment on the right, when the spring is disconnected, the wheel 9 starts rotating in the direction of the arrow, and the rotation locking member 8 is released from rotation restriction and starts rotating in the direction of the arrow. As shown in (B-1), when the rotation locking member 8 starts rotating, the distance between the tip of the surface portion 80 of the rotation locking member 8 and the nearest convex portion 910 is relatively large, and (B-1) As shown in -2), when the distal end side of the rotation locking member 8 falls into the recess 911 of the wheel 9, and the wheel 9 further rotates in the first direction, as shown in (B-3). , the tip of the rotation locking member 8 comes into contact with the side portion (side surface 915) of the convex portion 910 and becomes locked. FIG. 22A shows a partially enlarged view of FIG. 22(B-2). With respect to the wheel 9 rotating in the α direction, the inner surface 802 of the surface portion 80 of the rotation locking member 8 that is about to rotate in the arrow direction is on the upper surface 914 (the side closer to the side surface 915) of the convex portion 910 of the wheel 9. When riding on it, the rotation locking member 8 assumes a posture in which the distal end side falls into the recess 911. In this attitude, the inner edge 800A of the tip 800 contacts the bottom surface 916 of the recess 911. At this time, a force is applied to the rotation locking member 8 by the torsion spring 10 in the direction of pressing the edge 800A against the bottom surface 916, but the bottom surface 916 and the inner surface (flat surface) 802 of the surface portion 80 Since the angle formed is small, the resistance is extremely small, and as the wheel 9 rotates in the α direction, the edge 800A slides against the bottom surface 916 and locks onto the side portion of the convex portion 910. Note that depending on the timing, the inner edge 800A of the tip 800 may directly engage the side portion of the convex portion 910 without slidingly contacting the bottom surface 916. FIG. 22B is a partially enlarged view of FIG. 22 (B-3), showing the locked state (locked state) between the locking part of the rotation locking member 8 and the locked part of the wheel 9, Rotation of the wheel 9 in the α direction is restricted. In the illustrated embodiment, the inner edge 800A of the tip 800 of the surface portion 80 of the rotation locking member 8 is engaged with the connecting portion between the side surface 915 of the convex portion 910 and the bottom surface 916 of the recess 911, and the outer edge 800A of the tip 800 The edge 800B is engaged with a side portion of the protrusion 910.

(A-1) to (A-4) on the left side of FIG. 23 show the behavior of the rotation locking member 8 according to the first embodiment with respect to the wheel 9. (B-1) to (B-4) on the right side of FIG. 23 show the behavior of the rotation locking member 8 according to the second embodiment with respect to the wheel 9. The left side embodiment and the right side embodiment differ only in the configuration of the rotation locking member 8. The rotation locking member 8 in the right side embodiment is the rotation locking member 8 shown in FIG. 12, and has an opening 83 formed in the surface portion 80. In the rotation locking member 8 in the left embodiment, the opening 83 is not provided in the surface portion 80 of the rotation locking member 8 . (A-1), (A-3), and (A-4) in FIG. 23 correspond to (B-1), (B-2), and (B-3) in FIG. 22.

As shown in FIG. 12, an opening 83 into which a convex portion 910 of the wheel 9 can enter is formed in the surface portion 80 of the rotation locking member 8 in the right side mode. The width of the opening 83 is larger than the thickness of the wheel 9 (that is, the convex portion 910), and the vertical width of the opening 83 (the dimension between the edge 830 on the distal side and the edge 831 on the proximal side) It is smaller than the circumferential dimension of portion 910. In a state where the convex portion 910 of the wheel 9 enters the opening 83, rotation of the wheel 9 in the first direction is allowed, and rotation in the second direction is restricted.

In the embodiment on the left side, the opening 83 is not formed in the surface portion 80 of the rotation locking member 8, and as shown in (A-2), the inner surface of the surface portion 80 rides on the convex portion 910, so that it moves in the locking direction. The rotation of the wheel 9 is once restricted, and then, as shown in (A-3), the tip side of the rotation locking member 8 falls into the recess 911 and the wheel 9 further rotates in the first direction. ), the tip of the rotation locking member 8 comes into contact with the side portion of the convex portion 910, resulting in a locked state.

In the embodiment on the right, an opening 83 is formed in the surface portion 80 of the rotation locking member 8, and as shown in (B-2), the convex portion 910 enters the opening 83 of the surface portion 80, and the rotation locking member 8 is closed. The tip side is configured to quickly fall into the recess 911. At this time, the upper surface 914 of the convex portion 910 approaches or contacts the proximal edge 831 of the opening 83, but even if the convex portion 910 enters the opening 83, the upper surface 914 of the wheel 9 in the first direction Rotation is allowed, and as shown in (B-3), the rotation locking member 8 maintains a posture in which the tip falls into the recess 911 and the wheel 9 rotates in the first direction. When the protrusion 911 comes out of the opening 83 and the wheel 9 further rotates in the first direction, the tip of the rotation locking member 8 is located on the side of the protrusion 910, as shown in (B-4). They come into contact and become locked. FIG. 23A shows a partially enlarged view of FIG. 23(B-2). With respect to the wheel 9 rotating in the α direction, the inner surface 802 of the surface portion 80 of the rotation locking member 8 that is about to rotate in the arrow direction is on the upper surface 914 (the side closer to the side surface 915) of the convex portion 910 of the wheel 9. When the vehicle rides on the vehicle, the convex portion 910 immediately enters the opening 83 formed in the surface portion, so that the distal end side of the rotation locking member 8 falls into the concave portion 911. In this attitude, the inner edge 800A of the tip 800 contacts the bottom surface 916 of the recess 911. At this time, a force is applied to the rotation locking member 8 by the torsion spring 10 in the direction of pressing the edge 800A against the bottom surface 916, but the bottom surface 916 and the inner surface (flat surface) 802 of the surface portion 80 Since the angle formed is small, the resistance is extremely small, and as the wheel 9 rotates in the α direction, the edge 800A slides against the bottom surface 916 and locks onto the side portion of the convex portion 910.

With reference to FIG. 24, prevention of reverse rotation of the wheel 9 when the locking device is activated will be described. In the locking device, when the spring is cut, the rotational locking member 8 locks with the locked portion of the wheel 9, thereby regulating the rotation of the shaft that attempts to rotate in the first direction due to the weight of the door body. The wheel 9 may be reversed due to the reaction upon locking. As shown in FIGS. 24(A-1) and (A-2), when the wheel 9 is reversed during locking, the tip of the rotation locking member 8 and the locked part are separated and rotated to the adjacent convex part 910. There is a risk that the surface portion 80 of the locking member 8 may run over and the locked state (locked state) may be released. Further, the rotation of the wheel 9 is accelerated during normal rotation again, which may cause malfunction (for example, tooth skipping).

In this embodiment, this problem can be solved by employing the rotation locking member 8 having the opening 83 in the surface portion 80. When the wheel 9 rotates in the second direction from the locked state shown in FIG. 24 (B-1), the convex portion 910 adjacent to the opening 83 of the surface portion 80 of the rotation locking member 8 enters the state shown in FIG. 24 (B-2). becomes. At this time, the edge 830 on the tip side of the opening 83 is locked to the side surface (locked part) 915 of the adjacent convex part 910, and rotation of the wheel 9 in the second direction is restricted. During forward rotation, as shown in FIG. 23 (B-3), as the wheel 9 rotates in the first direction, the convex portion 911 comes out of the opening 83, and the wheel 9 further rotates in the first direction. Then, the tip of the rotation locking member 8 comes into contact with the side portion of the convex portion 910, returning to the locked state shown in FIG. 24 (B-1). FIG. 24A is a partially enlarged view of FIG. 24(B-2). When the wheel 9 rotates in the β direction from the locked state, the side surface 915 of the convex portion 910 separates from the tip 800 of the surface portion 80 of the rotation locking member 8, and the surface portion 80 of the rotation locking member 8 The adjacent convex portion 910 (the corner formed by the upper surface 914 and the side surface 915) enters into the opening 83 of the opening 83, and the side surface 915 abuts and locks against the edge 830 of the opening 83, and the wheel 9 rotation in the β direction is regulated.

[C-5] Spring breakage detection device The spring breakage detection device is a device that detects breakage of the balance spring. For example, when an overhead door is moved up and down electrically, a detection signal from a spring breakage detection device is sent to a control unit of an opening/closing machine, and the drive of the motor of the opening/closing machine is stopped. The spring breakage detection device includes a detection switch 11 that detects breakage of the spring, and the detection switch 11 is attached to the inner surface of the side surface 311 of the bracket body 31. The detection switch 11 according to this embodiment is attached to the inner surface of the side surface portion 311 of the bracket main body 31 so that its position can be adjusted.

As shown in FIG. 26, the detection switch 11 includes a switch body 110 and a lever 111 rotatably attached to the switch body 110. The switch body 110 has a cover that the lever 111 can contact. A contact portion 112 is provided, and a wiring 113 extends from the switch body 110. The switch body 110 is a rectangular parallelepiped in a plan view, and insertion holes 114, 114 passing through the thickness direction are formed at diagonally located corners. The detection switch 11 is in an ON state when the lever 111 is in contact with the contacted part 112, and is in an OFF state when the lever 111 is in a non-contact state away from the contacted part 112. It is biased in the direction of holding.

In this embodiment, the detection switch 11 is attached to an upper part of the inner surface of the side surface portion 311 of the bracket main body 31 in an inclined position. The detection switch 11 is positioned and fixed such that the tip of the lever 111 is located within the movable range of the bending piece 73 of the actuator 7 . Normally, the bent piece 73 of the actuator 7 pushes the lever 111 so that it maintains contact with the contacted portion 112, and the detection switch 11 is in the ON state (FIG. 18). When the spring is disconnected, the rotation lock member 8 rotates from the first attitude to the second attitude due to the biasing force of the torsion spring 10 of the rotation lock member 8, and the actuating body 7 is pushed to the first position. When the lever 111 rotates from the posture to the second posture and the bent piece 73 of the actuating body 7 separates from the tip side of the lever 111, the lever 111 rotates and is displaced from the contact state to the non-contact state, and is switched from the ON state to the non-contact state. Spring breakage is detected by detecting the switch to the OFF state (FIG. 19).
Note that even if the actuating body 7 that has rotated from the first attitude to the second attitude rotates in the direction returning to the first attitude due to reaction, the actuating body 7 will not be attached to the rotation locking member 8 that is engaged with the locked portion of the wheel 9. The lever 111 is not returned to the position where the detection switch is turned on.

The detection switch 11 according to the present embodiment is fixed to the inner surface of the side surface 311 of the bracket main body 31 via the mounting plate 12 with screws 123 so that its position can be adjusted. As shown in FIG. 27, the mounting plate 12 is a plate-shaped body with a predetermined thickness, and is fixed to the first portion 12A to which the switch body 110 of the detection switch 11 is fixed, and the side surface portion 311 of the bracket body 31. and a second portion 12B. Two insertion holes 120, 120 are formed in the first portion 12A of the mounting plate 12, and when the detection switch 11 is stacked on the first portion 12A, the insertion hole 114 of the detection switch 11 and the mounting plate 12 are inserted. The holes 120 are aligned. Two insertion holes 121, 121 are formed in the second portion 12B of the mounting plate 12.

Place the switch body 110 of the detection switch 11 on one surface of the mounting plate 12, and fix the detection switch 11 and the mounting plate 12 with screws (bolts) 115 passing through the insertion holes 114, 120 and female screws (nuts) 116. and become one. A detection switch assembly consisting of the detection switch 11 and the mounting plate 12 is shown in FIG. The detection switch 11 is prepared as a detection switch assembly, and the detection switch assembly is fixed to the side surface 311 of the bracket main body 31.

Two female screws 122 are formed in the upper part of the inner surface of the side part 311 of the bracket main body 31. It is designed to coincide with the insertion hole 121 of the plate 12 (FIG. 28). The detection switch assembly is constructed by screwing the shaft portion of the screw 123 inserted through the insertion hole 121 into the female screw 122 of the side surface portion 311 in a position where the insertion hole 121 of the mounting plate 12 is located at the upper end. It is fixed at 31. By forming the female screw 122 on the side surface 311 of the bracket main body 31, there is no need to provide a nut on the outer surface of the side surface 311, and installation workability is improved.

The diameter of the insertion hole 121 formed in the mounting plate 12 is larger than the diameter of the female screw 122 and the diameter of the shaft portion 124 of the screw 123. Therefore, the detection switch assembly is movable within the gap between the shaft portion 124 of the screw 123 and the insertion hole 121, and its position can be adjusted depending on the range of movement.

Two circular openings 117 are formed in the upper part of the inner surface of the side surface part 311 and are located below the insertion hole 121 . When the assemblies are stacked, the head of the screw 115 that fixes the switch body 110 and the mounting plate 12 is aligned and received. The diameter of the opening 117 is larger than the diameter of the head of the screw 115 so that the head of the screw 115 moves through the opening 117 when adjusting the position of the detection switch assembly. As shown in FIG. 10, a female screw 122 and an opening 117 are formed in both the upper and lower parts of the side surface 311 of the bracket body 31. By doing so, it can be used for the bracket 3B.

Adjustment of the mounting position of the detection switch 11 will be described with reference to FIG. 29. The position of the detection switch 11 can be adjusted within the clearance between the insertion hole 121 of the mounting plate 12 of the detection switch assembly and the shaft portion 124 of a screw 123 that attaches the detection switch assembly to the side surface 311. The upper figure shows the mounting position where the insertion hole 121 is closer to the upper side with respect to the shaft portion 124 of the screw 123, and it can be seen that the detection switch 11 is located higher than in the middle and lower figures. The middle diagram shows the mounting position where the insertion hole 121 is closer to the left side with respect to the shaft portion 124 of the screw 123, and it can be seen that the detection switch 11 is located on the left side compared to the upper and lower diagrams. The lower figure shows the mounting position where the insertion hole 121 is closer to the right side with respect to the shaft portion 124 of the screw 123, and it can be seen that the detection switch 11 is located on the right side compared to the upper and middle figures. By finely adjusting the mounting position of the detection switch 11, for example, the relative positional relationship between the tip side portion of the lever 111 and the bent piece 73 of the actuating body 73 can be finely adjusted.

[C-6] Installation process of wire winding mechanism As shown in FIG. 3, the wire winding mechanism 1 according to the present embodiment includes brackets 3A, 3B, and 4A provided at predetermined portions of the frame 13 in the width direction. , 4B, 5A, 5B. Insertion grooves (not shown) for the shafts 2A, 2B are formed in the rising surfaces of the brackets 4A, 4B, 5A, 5B from the front end toward the rear. It is accepted and supported. As described above, the brackets 3A and 3B are composed of two members: the mounting base 30 and the bracket main body 31. The mounting base 30 includes a rear surface portion 300 and left and right side surface portions 301 and 302 rising forward from widthwise ends of the rear surface portion 300, and is fixed to the frame 13 via the rear surface portion 300. The bracket main body 31 includes a rear surface section 310 and left and right side surfaces 311 and 312 rising forward from the widthwise ends of the rear surface section 310, and includes a rear surface section 310 and left and right side surface sections 311 and 312 that rise forward from the width direction ends of the rear surface section 310. It is inserted into the space, the rear part is located in the space, and it is attached to the mounting base 30 in a manner that it is brought forward.

The mounting bases 30 of the brackets 3A, 3B are attached to the frame 13 like the other brackets 4A, 4B, 5A, 5B, while the bracket main body 31 is a component of the wire winding mechanism 1. The first shaft 2A and the second shaft 2B are rotatably supported on the front side portion (portion 311') of the side surface 311 of the bracket main body 31, and the first shaft 2A and the second shaft 2B have the portion 311'. A wheel 9 constituting a locking device is fixed to the inside of the housing. Furthermore, the component elements of the door fall prevention device (the actuating body 7, the rotation locking member 8 constituting the locking device, etc.) are supported by the portion 311'. The bracket main body 31 is attached to the mounting base 30 integrally with other components of the wire winding mechanism 1.

A horizontal bent piece 303 is formed at the lower end of the side surface 301 of the mounting base 30 and is located below the insertion space of the rear side portion of the bracket body 31. When inserted into the space between the side parts 301 and 302 of the bracket body 30, the bracket body 30 can be supported. Since the bracket main body 31 is attached to the mounting base 30 as a component of the wire winding mechanism 1, by temporarily supporting the lower end 316 of the bracket main body 31 on the bent piece 303 of the mounting base 30, the bracket main body 31 is attached to the mounting base 30. The workability of fixing the bracket body 31 is improved.

A horizontal bent piece 304 is formed at the upper end of the side surface 302 of the mounting base 30 and is located above the insertion space of the rear side portion of the bracket body 31. When inserted into the space between the side parts 301 and 302 of the bracket body 30, it is possible to prevent the front part of the bracket body 30 from falling downward, improving the workability of fixing the bracket body 31 to the mounting base 30. I'm letting you do it.

The process of attaching the brackets 3A and 3B and the process of attaching the wire winding mechanism 1 will be described with reference to FIGS. 30 and 31. In the process of attaching the brackets 3A and 3B, first, as shown in FIGS. 30(A) and 31(A), the mounting base 30 is fixed to the frame body 13 via the rear surface part 300 with anchor bolts 305, and then attached to the frame body. The rear part of the bracket main body 31 is inserted into the space between the left and right side parts 301 and 302 of the fixed mounting base 30 from the front.

As shown in FIGS. 30(A) and 31(A), when the bracket main body 31 is inserted into the space between the left and right side surfaces 301 and 302 of the mounting base, the bent piece 303 at the lower end The lower end 316 of the lower end 316 (equipped with a fall prevention device) is temporarily supported. At this time, the upper end bending piece 304 is located just above the upper end 317 of the bracket main body 31 (which is provided with a door fall prevention device), and prevents the front part of the bracket main body 30 from falling downward. are doing. In the temporarily supported state, adjust the mounting position of the bracket main body 30 with respect to the mounting base 30, insert the bolts 32 from the left and right side parts 301, 302 of the mounting base 30, and attach them to the side parts 311, 312 of the bracket main body 31. By connecting the bracket body 31 to the attached nut 33, fixing of the bracket main body 31 to the mounting base 30 is completed (FIGS. 30(C) and 31(C)).

Although only a part of the wire winding mechanism is shown in FIGS. 30 and 31, in this embodiment, the bracket main body 31 is not fixed to the mounting base 30 alone, but the wire winding mechanism is integrated into the bracket. It is supported and fixed by the mounting base 30 of 3A, the mounting base 30 of bracket 3B, and brackets 4A, 4B, 5A, and 5B. The installation process of the wire winding mechanism 1 includes the first winding drum 1A, the first shaft 2A, the first coil spring 6A, the bracket bodies 31, 31, the second shaft 2B, the second coil spring 6B, and the second winding drum. 1B to prepare a winding assembly; fixing a plurality of brackets 4A, 4B, 5A, 5B, and mounting stands 30, 30 to predetermined portions of the frame 13; fixing the winding assembly from the front to a plurality of brackets; 4A, 4B, 5A, 5B, supported by mounting bases 30, 30; fixing the winding assembly to a plurality of brackets 4A, 4B, 5A, 5B, mounting bases 30, 30; The above description can be used for the process of attaching the bracket main body 31 to the bracket body 31.

In this embodiment, the mounting base 30 is fixed to the frame body 13 by anchor bolts 305, and the shaft portion of the anchor bolt 305 protruding from the frame body 13 extends through the mounting hole 3000 of the rear surface portion 300 of the mounting base 30. It is inserted. When the bracket main body 31 is attached to the mounting base 30, the rear surface 300 of the mounting base 30 and the rear surface 310 of the bracket main body 31 are separated from each other and face each other. An opening 3100 is formed facing each other, and the opening 3100 serves as an insertion hole through which the anchor bolt 305 can be inserted. Therefore, even if the rear surface 300 of the mounting base 30 and the rear surface 310 of the bracket main body 31 are close to each other as in the embodiment shown in FIG. It is possible to receive and release the anchor bolt 305.

1 Wire winding mechanism 2A First shaft 2B Second shaft 3A Bracket 3B Bracket 30 Mounting base 300 Rear part 301 Side part 302 Side part 31 Bracket body 310 Rear part 311 Side part 312 Side part 6A First coil spring 6B Second coil Spring 60 First cylindrical body 62 Spacer 7 Actuating body 8 Rotation locking member 80 Surface portion 800 Tip (locking portion)
83 Opening 9 Wheel 90 Boss 900 Outer peripheral surface 900' Planar portion 91 Plate element 91A First surface 91B Second surface 910 Convex portion 915 Side surface (locked portion)
911 Recessed portion 912 Opening 913 Inner peripheral surface of opening 913' Plane portion 92 Fillet weld 10 Torsion spring 11 Detection switch 12 Mounting plate 13 Body

Claims (5)

A shaft rotatably supported by multiple brackets,
a door body that descends when the shaft rotates in a first direction and rises when the shaft rotates in a second direction;
One end side is located and attached to a first side of one of the plurality of brackets, the other end side is attached to the shaft, and is tightened by rotation of the shaft in a first direction. a spring that stores energy and is released when rotated in the second direction;
A detection switch for detecting disconnection of the spring is attached to a second side of the one bracket, the position of which is adjustable;
The detection switch includes a plate-shaped mounting portion, and is fixed to the one bracket via the mounting portion with a plurality of screws,
A plurality of female screws into which the screws can be screwed are formed in the one bracket,
A plurality of insertion holes are formed in the mounting portion so as to correspond to the plurality of female screws,
The size of the insertion hole is larger than the diameter of the shaft of the screw and the female screw,
The detection switch is attached to the one bracket by a screw that is adjusted in position within a gap between the shaft portion and the insertion hole, and is inserted through the insertion hole and screwed into the female screw.
Spring breakage detection device. A detection switch assembly is formed from the detection switch and the mounting plate,
The mounting plate includes a portion that becomes the mounting portion and a portion to which the detection switch is fixed.
The spring breakage detection device according to claim 1 . An actuating body is provided on a second side of the one bracket and is displaced in conjunction with disconnection of the spring,
Under normal conditions, the detection switch is in contact with the operating body, and when the spring is disconnected, the operating body is displaced and the detection switch is brought into a non-contact state, thereby detecting spring breakage.
The spring breakage detection device according to any one of claims 1 and 2 . A cylindrical body to which one end side of the spring is attached is located on a first side of the one bracket, the cylindrical body is fixed to the actuating body, and the cylindrical body and the actuating body are connected to the one end of the spring. rotatably attached to two brackets,
The spring breakage detection device according to claim 3 . A locking device is provided on a second side of the one bracket to restrict rotation of the shaft in the first direction when the spring is cut;
The locking device includes a plurality of locked parts on the outer periphery, a wheel that rotates integrally with a shaft, and a rotational locking member that can be locked to the locked parts,
The rotation locking member is rotatable between a non-locking position and a locking position, and a distal end thereof is biased in a direction to rotate forward and lock the locked portion,
The operating body is in contact with the rotation lock member in the unlocked position and holds the rotation lock member in the unlocked position by the biasing force of the spring,
When the spring is disconnected, the force that holds the rotation locking member in the unlocked position is lost, and the rotation locking member locks with the locked portion to restrict rotation of the shaft in the first direction. do,
The spring breakage detection device according to claim 3 or 4.

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