JP7479899B2 - Wheel, locking device equipped with said wheel, and door drop prevention device equipped with said locking device - Google Patents

Description

The present invention relates to a door fall prevention device that prevents the door from falling when the balance spring of the shaft breaks.

Overhead doors are known as fittings that are installed in openings that connect the outdoors to the inside of buildings such as warehouses and garages. The door body of an overhead door is made up of multiple panels connected to each other so that they can rotate vertically. Wires are connected to both the left and right ends of the lowest panel in the width direction, and a wire winding mechanism is provided above the opening. When the opening is fully closed, the left and right wires are pulled up by the wire winding mechanism, and each panel is pulled up from a vertical position to a nearly horizontal position, and the opening is fully open. The winding mechanism is equipped with a so-called balance spring, and when the door body descends, the balance spring is twisted by the load of the door body acting on the balance spring, storing force, and when the opening is opened, the return force of the stored force acts as a force to wind up the wire, assisting the door body's upward movement.

A door body fall prevention device has been proposed for overhead doors that prevents the panel from falling under its own weight when the balance spring is cut (Patent Document 1). The door body fall prevention device restricts the rotation of the shaft by engaging the locking claw of the locking member with the locking teeth on the outer periphery of the wheel that rotates integrally with the shaft, but when restricting the rotation of the shaft (when the locking claw engages with the locking teeth on the outer periphery of the wheel), an impact is applied to the wheel connected to the shaft, so the wheel is required to have a certain strength.

In particular, when a wheel is formed by connecting two components, there is a risk that the connection will break when the wheel receives an impact, causing the wheel to spin freely and malfunction, and this must be avoided. For example, when a wheel is secured by welding a cylindrical boss to a disc-shaped ratchet wheel, it is possible to ensure strength by welding the entire circumference of the corner formed by the boss and the ratchet wheel, but this increases the amount of work required for welding and leads to increased costs, and welding the entire circumference can also cause distortion of the ratchet wheel.

A wheel that rotates integrally with a shaft and is formed by welding two members (a gear and a base material) is described in Patent Document 2, but it is considered that the gear and the base material are welded all around. Also, the gear on the outer periphery of the wheel is a transmission element, and is not engaged by a locking member to restrict the rotation of the shaft.
JP2008-285959 Practical publication 49-65857

The present invention aims to provide a wheel that is strong enough to withstand the impact when a locking member engages with a boss capable of receiving a shaft and a plate-shaped element that has an engaging portion on its outer periphery and an opening for receiving the boss.

The technical means adopted in the present invention are:
a boss capable of receiving a shaft;
A plate-like element having one or more engaging portions on its outer periphery and an opening for receiving the boss;
It consists of:
The outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element are
The boss can be inserted into the opening, and has a shape that allows a circumferential force to be transmitted between the boss and the opening when the boss is inserted.
In the inserted state, at least a part of a first corner formed between the outer peripheral surface of the boss and the first surface of the plate-like element and a second corner formed between the outer peripheral surface of the boss and the second surface of the plate-like element are welded.
Wheels.

In one embodiment, only one of the first corner portion and the second corner portion is welded.
In this way, by making it possible to perform welding on only one side, the efficiency of the wheel assembly work (welding work) can be improved without reducing the strength of the entire wheel.

In one embodiment, the outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element are each partially circular with at least one flat surface.
This segmented circular shape is an example of a preferred shape, and the outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element may have other shapes.

Other technical means adopted in the present invention are:
The above wheel,
A locking member capable of being engaged with the engaged portion;
Equipped with
The boss receives the shaft so as to rotate integrally with the shaft,
In use, the engaged portion and the locking member are in an unlocked state, allowing the shaft to rotate freely, and in an emergency, the locking member engages with the engaged portion to restrict the rotation of the shaft.

Other technical means adopted in the present invention are:
A door fall prevention device equipped with the above locking device,
The door body is lowered by rotating the shaft in a first direction, and the door body is raised by rotating the shaft in a second direction.
A force that rotates the shaft in a first direction is applied to the shaft by the weight of the door body,
the shaft is provided with a spring that is wound and stored by rotation of the shaft in a first direction and released by rotation of the shaft in a second direction;
In the event of an emergency in which the spring breaks, the shaft will attempt to rotate in a first direction due to the weight of the door body, but the locking member will instantly engage with the engaged portion in response to the spring breaking, restricting the rotation of the shaft in the first direction.
A device to prevent the door body from falling.

In the present invention, in a wheel formed by connecting a boss capable of receiving a shaft and a plate-shaped element having an engaged portion on its outer periphery and an opening formed therein for receiving the boss, the outer circumferential surface of the boss and the inner circumferential surface of the opening of the plate-shaped element have shapes that allow the boss to be inserted into the opening and, when inserted, allow circumferential forces to be transmitted between them. Therefore, the combination of the shapes of the outer circumferential surface of the boss and the inner circumferential surface of the opening of the plate-shaped element and the strength of the connection portion (welded portion) between the boss and the plate-shaped element can ensure strength sufficient to withstand the impact when the locking member engages with the engaged portion of the wheel.
Therefore, the strength of the welded portion between the boss and the plate-shaped element can be reduced, and in the inserted state, the first corner portion formed by the outer peripheral surface of the boss and the first face of the plate-shaped element, and the second corner portion formed by the outer peripheral surface of the boss and the second face of the plate-shaped element can be welded only partially without welding the entire circumference, for example, only one of the first corner portion or the second corner portion can be welded. By welding only on one side, the welding work can be reduced, costs can be reduced, and distortion of the plate-shaped element can be prevented as much as possible.

In the wheel of the present invention, the outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element have shapes that allow circumferential forces to be transmitted between them when the boss is fitted into the opening. This prevents the wheel from spinning freely even if the weld breaks, improving the reliability of the operation of the locking device and the operation of the door body drop prevention device equipped with the locking device.

FIG. 2 is a front view of the overhead door in a fully closed position as viewed from the inside of the vehicle. FIG. 2 is a side view of the overhead door in a fully closed position. 2A and 2B are plan and front views of the winding mechanism of the overhead door according to the embodiment of the present invention. 1 is an exploded perspective view of a door body fall prevention device according to an embodiment of the present invention (shaft is omitted). 1 is a plan view of a door body drop prevention device according to an embodiment of the present invention. 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. 2 is a front view of a bracket that rotatably supports a shaft and to which a balance spring is attached. 3A and 3B are a plan view, a front view, and a side view of a mounting base that constitutes a bracket. 2A to 2C are a plan view, a front view, and a side view of a bracket body that constitutes a bracket. FIG. 4A to 4C are a side view, a plan view, and a front view of a rotation lock member. 2A and 2B are side and cross-sectional views of a wheel. 13A and 13B are a side view and a cross-sectional view of a wheel having a boss according to another embodiment. 4A and 4B are a side view and a cross-sectional view of a plate-like element that constitutes a wheel. 4A and 4B are a side view and a cross-sectional view of a boss that constitutes the wheel. 13A and 13B are a side view and a cross-sectional view of a boss according to another embodiment. 13A and 13B are a side view and a cross-sectional view of a wheel according to another embodiment. 13A and 13B are a side view and a cross-sectional view of a plate-shaped element constituting a wheel according to another embodiment. 4 is a side view of the fall prevention device, showing the fall prevention device and the spring breakage detection device in an inoperative state. FIG. 4 is a side view of the fall prevention device, showing the operating state of the fall prevention device and the spring breakage detection device. FIG. FIG. 2 is a side view of the fall prevention device (inactivated state) with the actuator and spacer highlighted; FIG. 2 is a cross-sectional view of the fall prevention device (in an inoperative state) with the actuator and spacer highlighted; The left figure shows the behavior of the rotation lock member of the locking device according to the comparative example from an unlocked state to a locked state, and the right figure shows the behavior of the rotation lock member of the locking device according to the present embodiment from an unlocked state to a locked state. FIG. 22(B-2) is a partially enlarged view. FIG. 22(B-3) is a partially enlarged view. The left figure shows the behavior of the rotation locking member according to the first embodiment from an unlocked state to a locked state, and the right figure shows the behavior of the rotation locking member according to the second embodiment from an unlocked state to a locked state. FIG. 23B-2 is a partially enlarged view of FIG. 13A and 13B are diagrams illustrating a reverse rotation prevention mechanism using a rotation lock member according to a second embodiment. FIG. 24(B-2) is a partially enlarged view. FIG. 2 illustrates a detection switch assembly. 4A and 4B are diagrams showing a detection switch main body constituting the detection switch assembly. 13A and 13B are views showing a mounting plate that constitutes the detection switch assembly. 11A and 11B are diagrams illustrating attachment of the detection switch assembly to a bracket. 11A and 11B are diagrams illustrating adjustment of the mounting position of the detection switch assembly with respect to the bracket. FIG. 11 is a plan view illustrating a process of attaching the winding mechanism. FIG. 11 is a front view illustrating a process of attaching the winding mechanism. 1A is a plan view, a front view, and a side view showing a mounting base fixed to a body. 1A is a plan view, a front view, and a side view showing a bracket body attached to a mounting base (in a state where the bracket body is inserted most deeply into the mounting base). FIG.

[A] Overall structure of the overhead door Fig. 1 is a front view of the overhead door in a fully closed position as seen from the inside of the room, and Fig. 2 is a side view of the overhead door. The door body of the overhead door is composed of multiple horizontally rectangular panels P connected to each other so that they can rotate vertically.

Roller brackets are provided on both the left and right ends of each panel P in the width direction, and the door body opens and closes the opening by raising and lowering the guide rollers of the roller brackets on both the left and right ends of each panel P while being guided by guide rails G provided on the left and right sides of the width direction of the opening.

As shown in Fig. 2, the guide rail G is composed of a first section _G1 extending in the height direction of the opening, a curved second section _G2 extending rearward from above the first section _G1 toward the inside of the room, and a third section _G3 extending rearward from the rear of the second section _G2 along the ceiling. The first section _G1 is gently inclined from the bottom to the top toward the inside of the room. The third section _G3 is gently inclined upward toward the inside of the room.

In the fully closed state of the opening, each panel P is located at the first portion _G1 of the guide rail G, so that the multiple panels P assume a vertical position and close the opening. A wire W is connected to both the left and right ends of the width direction of the lowest panel P, and a winding mechanism 1 for the wire W is provided above the opening. From the fully closed state of the opening, the left and right wires W are simultaneously pulled up by the winding mechanism 1 for the wire W, so that each panel P is pulled up from a vertical position to a substantially horizontal position located at the third portion _G3 , and the opening is fully opened. The winding mechanism 1 is equipped with a so-called balance spring (a first spring 6A and a second spring 6B described later), and when the door body descends, the balance spring is twisted by the load of the door body acting on the balance spring to accumulate force, and when the opening is opened, the return force of the accumulated force acts as a force to wind up the wire W, assisting the lifting operation 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 includes left and right winding drums 1A and 1B located above both ends in the opening width direction, and a rotation mechanism that allows the left and right winding drums 1A and 1B to rotate synchronously as a unit. As shown in FIG. 3, the rotation mechanism according to this embodiment includes two first and second shafts 2A and 2B connected in series in the opening width direction, and one end of the first and second shafts 2A and 2B is connected to the left and right winding drums 1A and 1B via a joint 20 so as to be rotatable as a unit, and the other end of the first and second shafts 2A and 2B is connected to the left and right winding drums 1A and 1B so as to be rotatable as a unit. In this embodiment, the rotation mechanism includes two shafts, but the number of shafts may be one, or three or more shafts may be connected to rotate as a unit depending on the opening width dimension, the weight of the door body, etc.

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

Brackets 5A and 5B are fixed to the main body in a protruding manner above both ends of the opening. The first winding drum 1A is supported rotatably (by bearings) between brackets 4A and 5A. The second winding drum 1B is supported rotatably (by bearings) between brackets 4B and 5B. In the illustrated embodiment, brackets 5A and 5B are L-shaped in plan view, but the shape of brackets 5A and 5B is not limited.

A first coil spring 6A is fitted to the first shaft 2A, one end of which is wound around and connected to the outer surface of a first cylindrical body 60 connected to the bracket 3A, and the other end of which is wound around and connected to the outer surface of a second cylindrical body 61 that rotates integrally with the first shaft 2A. A second coil spring 6B is fitted to the second shaft 2B, one end of which 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 which is wound around and connected to the outer surface of the second cylindrical body 61 that rotates integrally with the second shaft 2B.

When the door body is lowered, the weight of the door body acts on the wire W, and the first shaft 2A and the second shaft 2B rotate in a first direction due to the rotation of the first winding drum 1A and the second winding drum 1B. At this time, the first coil spring 6A is twisted and wound up as the first shaft 2A rotates in the first direction, storing energy, and the second coil spring 6B is twisted and wound up as the second shaft 2B rotates in the first direction, storing energy. When the opening is opened, the first coil spring 6A and the second coil spring 6B, which have been wound up and stored energy, are released, and the return force of the springs acts to rotate the first shaft 2A and the second shaft 2B in the second direction to wind up the wire W, assisting the lifting of the door body.

[C] Door body drop prevention device [C-1] Background In this embodiment, the first coil spring 6A and the second coil spring 6B are provided corresponding to the two first shaft 2A and the second shaft 2B, respectively, and the spring forces of the first coil spring 6A and the second coil spring 6B are set to balance the weight of the door body when combined, so that when the door body is raised and lowered, if at least one of the first coil spring 6A and the second coil spring 6B breaks, the balance between the weight of the door body and the spring force is lost (the force of the weight becomes relatively large with respect to the total spring force), and the door body falls (suddenly falls) while pulling out the wire W. The overhead door according to this embodiment is equipped with a door body drop prevention device that prevents the door body from suddenly falling when the so-called balance spring breaks, and a spring break detection device that detects that the balance spring has broken (see Figures 4, 5, 18, 19, etc.).

The door body fall prevention device and the spring breakage detection device are provided corresponding to each shaft and each balance spring, i.e., 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 is equipped with two door body fall prevention devices and two spring breakage detection devices. In this embodiment, the door body fall prevention device and the spring breakage detection device corresponding to the first shaft 2A and the first coil spring 6A are provided on the bracket 3A, and the door body fall prevention device and the spring breakage detection device corresponding to the second shaft 2B and the second coil spring 6B are provided on the bracket 3B (see Figures 3, 30, and 31). The brackets 3A and 3B are also part of the components of the door body fall prevention device and the spring breakage detection device. In this specification, the door body fall prevention device and the spring breakage detection device corresponding to the first shaft 2A and the first coil spring 6A are mainly described, but these descriptions can be applied to the door body fall prevention device and the spring breakage detection device corresponding to the second shaft 2B and the second coil spring 6B.

[C-2] Bracket configuration The bracket 3A, which rotatably supports one end of the first shaft 2A, and the bracket 3B, which rotatably supports one end of the second shaft 2B, each comprise a mounting base 30 fixed to the body 13, and a bracket body 31 fixed to the mounting base 30. The bracket 3A is shown in Figs. 4 to 8. The brackets 3A and 3B are substantially the same in configuration, except that the bracket body 31 is attached on the opposite side. The bracket body 31 of the bracket 3A is turned upside down and left to right to become the bracket body 31 of the bracket 3B. Therefore, the following description of the mounting base 30 and the bracket body 31 is common to both brackets. In addition, the description referring to the first shaft 2A can be used as the description of the bracket 3B by replacing the first shaft 2A with the second shaft 2B.

As shown in FIG. 9, the mounting base 30 has a U-shape in plan view, consisting of a rear portion 300 and left and right side portions 301, 302 that are formed to rise forward from both widthwise ends of the rear portion 300, with the rear portion 300 being the mounting surface to the body, and the left and right side portions 301, 302 being the mounting surfaces to the bracket body 31. The rear portion 300 is vertically rectangular, and has two mounting holes (vertical elongated holes) 3000 formed with a gap in the height direction. With the rear portion 300 and the left and right side portions 301, 302 in a vertical position, the rear portion 300 is abutted against the body 13 and fixed to the body 13 by a fastening member (in this embodiment, an anchor bolt 305) that passes through the mounting hole 3000 (see FIG. 30 to FIG. 32).

The space between the left and right side portions 301, 302 is the insertion space for the rear side portion of the bracket main body 31, and the bracket main body 31 is inserted into this space to fix the bracket main body 31 to the left and right side portions 301, 302. Mounting holes (horizontally elongated holes) 3010, 3010 are formed on the upper and lower sides in the height direction of the side portion 301. Mounting holes (horizontally elongated holes) 3020, 3020 are formed on the upper and lower sides in the height direction of the side portion 302. In the embodiment shown in FIG. 9, the mounting holes 3010, 3020 are provided on the front side (the side away from the rear portion 300) of the side portions 301, 302, but when the width dimension (rise dimension) of the left and right side portions 301, 302 is small, the mounting holes 3010, 3020 extend over almost the entire width of the left and right side portions 301, 302 (see FIG. 32).

At the lower end of the side portion 301, a horizontal bent piece 303 is formed facing inward, located below the lower mounting hole 3010. The bent piece 303 is formed below the space between the side portions 301 and 302 (the insertion space at the rear side portion of the bracket main body 31). In the embodiment shown in FIG. 9, the bent piece 303 is formed in the front portion of the side portion 301, but in the embodiment shown in FIG. 32, the bent piece 303 is formed across almost the entire width, including the front portion of the side portion 301. The bent piece 303 at the lower end functions as a support piece when the bracket main body 31 (equipped with the first shaft 2A, locking device, etc.) is attached, and the function of the bent piece 303 at the lower end will be described later.

At the upper end of the side portion 302, a horizontal bent piece 304 is formed facing inward, located above the upper mounting hole 3020. The bent piece 304 is formed above the space between the side portions 301 and 302 (the insertion space at the rear side portion of the bracket main body 31). In the embodiment shown in FIG. 9, the bent piece 304 is formed in the front portion of the side portion 302, but in the embodiment shown in FIG. 32, the bent piece 304 is formed across almost the entire width, including the front portion of the side portion 302. The bent piece 304 at the upper end functions as a rotation restriction piece when the bracket main body 31 (equipped with the first shaft 2A, 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 body by being turned upside down from the state shown in FIG. 9. In this case, the folded piece 303 is located at the upper end and the folded piece 304 is located at the lower end. In addition, the edges at the tips of the side portions 301 and 302 are concave, so that when the mounting base 30 and the bracket body 31 are fixed, there is clearance for the first shaft 2A to the second shaft 2B that pass through the bracket body 31.

As shown in FIG. 10, the bracket main body 31 consists of a rear portion 310 and left and right upright side portions 311, 312 formed to rise forward from both widthwise ends of the rear portion 310. The rise dimension of the side portion 311 is greater than the rise dimension of the side portion 312. The rear end portion of the side portion 311 faces the side portion 312. The outer width dimension of the bracket main body 31 (rear portion 310) is approximately the same as the inner width dimension between the side portions 301, 302 of the mounting base 30, and with the rear portion 310 and the left and right side portions 311, 312 of the bracket main body 31 in a vertical position, the rear end portion of the bracket main body 31 can be inserted from the front into the internal space of the mounting base 30. The height dimension of the bracket body 31 is slightly smaller than the height dimension of the mounting base 30. When the bracket body 31 is inserted into the mounting base 30, the lower end 316 of the bracket body 31 is located above the lower bent piece 303 of the mounting base 30, and the upper end 317 of the bracket body 31 is located below the upper bent piece 304 of the mounting base 30. Mounting holes 3110, 3110 are formed at the rear end of the side portion 311, and mounting holes 3120, 3120 are formed at the top and bottom of the side portion 312. Nuts 33 are fixed to the inner surface of the side portion 311 in correspondence with the mounting holes 3110, 3110, and nuts 33 are fixed to the inner surface of the side portion 312 in correspondence with the mounting holes 3120, 3120.

When the rear side portion of the bracket body 31 is inserted between the left and right side portions 301, 302 of the mounting base 30, the side portions 301, 302 of the mounting base 30 abut the side portions 311, 312 of the bracket body 31, respectively, and the mounting holes 3110 and 3010, and the mounting holes 3120 and 3020, respectively, are aligned and fixed by a fastening member (in this embodiment, the bolt 32 is fixed to the nut 33). The front-rear position of the bracket body 31 relative to the mounting base 30 can be adjusted in the front-rear direction within the length of the mounting holes 3010, 3020, which are horizontally elongated holes. When the bracket body 31 is fixed to the mounting base 30, the rear portion 310 of the bracket body 31 and the rear portion 300 of the mounting base 30 face each other at a distance (see Figures 7 and 33). A circular opening 3100 is formed in the rear surface 310 of the bracket body 31, facing the mounting hole 3000 in the rear surface 300 of the mounting base 30.

The rise dimension of the side portion 311 of the bracket body 31 is larger than the rise dimension of the side portion 312, and the portion 311' extending forward beyond the opposing side portion 312 is the portion that rotatably supports the shaft 2A, and the portion 311' is provided with an insertion portion 313 of the first shaft 2A equipped with a bearing 313'. One end side of the first shaft 2A is rotatably supported by the insertion portion 313 of the portion 311' of the side portion 311 of the bracket body 31, passes through the inside of the first cylindrical body 60 and the first coil spring 6A, and the other end side is rotatably supported by the bracket 4A.

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

[C-3] Actuator The actuator 7 is a movable plate which is activated when the balance springs (first coil spring 6A, second coil spring 6B) are broken. In conjunction with the operation of the actuator 7, the door body's fall prevention device and the spring breakage detection device are instantly activated.

As shown in FIG. 11, the actuator 7 is a generally diamond-shaped plate having a first inclined edge 700, a second inclined edge 701, a third inclined edge 702, and a fourth inclined edge 703. More specifically, an edge 704 is formed between the first inclined edge 700 and the second inclined edge 701, an edge 705 is formed between the third inclined edge 702 and the fourth inclined edge 703, an edge 706 is formed between the first inclined edge 700 and the third inclined edge 702, and an edge 707 is formed between the second inclined edge 701 and the fourth inclined edge 703. The edges 704 and 705 face each other, the edges 706 and 707 face each other, and the dimension between the edges 706 and 707 is larger than the dimension between the edges 704 and 705. The shape of the actuator 7 is not limited to that shown in the figure.

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

In this embodiment, the actuator 7 is attached in a position that extends in the height direction (edge 706 on the top, edge 707 on the bottom), and the width dimension of the surface 70 is greatest at the center in the height direction and gradually decreases toward the top and bottom ends. An insertion hole 71 is located at the center in the height direction of the surface 70 of the actuator 7, and the upper bent piece 73 functions as a rotation restricting piece. Since the actuator 7 in this embodiment has bent pieces 73 on the top and bottom, when the actuator 7 is installed on the bracket 3A and bracket 3B on the left and right, respectively, one type of actuator 7 can be used by inverting the top, bottom, left and right.

The first shaft 2A is rotatably supported on the side surface 311 of the bracket main body 31, and a first cylindrical body 60 to which one end of a first coil spring 6A is attached is located on the outside of the side surface 311. The first cylindrical body 60 is fixed and integrated with an actuator 7 located on the inside of the side surface 311, and the first shaft 2A is rotatably inserted through the hollow portion of the first cylindrical body 60 and the insertion hole 71 of the actuator 7. 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 actuator 7, and the integrated first cylindrical body 60 and actuator 7 are attached in a movable (rotatable) state 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, the opening 314 formed in the side surface portion 311, and the mounting hole 72 formed in the surface portion 70 of the actuator 7 are aligned with each other. By inserting a screw (bolt) 74 from the inside to the outside of the side surface portion 311 into the mounting hole 72 and the opening 314 and fixing the screw 74 to the female screw 75, the actuator 7 and the first cylindrical body 60 are connected and integrated.

In this embodiment, the side portion 311 is provided with a ring-shaped spacer 62 positioned in the opening 314 with some play, and the shaft portion of the screw 74 connecting the first cylindrical body 60 and the actuator 7 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 portion 311, one surface of the spacer 62 abuts against the surface portion 70 of the actuator 7, and the other surface of the spacer 62 abuts against the end surface 600 of the first cylindrical body 60. The opening 314 is a substantially isosceles trapezoid with inclined sides 3140, 3140. The upper opening 314 and the lower opening 314 have a vertically symmetrical shape, and the upper opening 314 is an inverted trapezoid. In the upper and lower openings 314, one inclined side is located on the rear side (the side closer to the rear surface portion 310) and the other inclined side is located on the front side (the side farther from the rear surface portion 310). The distance between the inclined edges 3140 is greater than the outer dimensions of the spacer 62. In the state shown in FIG. 18, the actuator 7 is in a first position, the upper spacer 62 abuts against the rear inclined edge 3140 of the upper opening 314, and the lower spacer 62 abuts against the front inclined edge 3140 of the lower opening 314. In the state shown in FIG. 19, the actuator 7 is in a second position, the upper spacer 62 abuts against the front inclined edge 3140 of the upper opening 314, and the lower spacer 62 abuts against the rear inclined edge 3140 of the lower opening 314. That is, the spacer 62 can restrict the movable range (rotation range) of the actuator 7.

The actuator 7 and the first cylindrical body 60 are connected and integrated with a screw 74, and the first cylindrical body 60 and the actuator 7 are biased in a direction (arrow direction in FIG. 18) that rotates the rotation lock member 8 from the second position (locked position) to the first position (unlocked position) by the first coil spring 6A fixed to the outer circumferential surface of the first cylindrical body 60. When the first coil spring 6A breaks, the force acting in the direction that rotates the rotation lock member 8 from the second position to the first position is released, and the first cylindrical body 60 and the actuator 7 become free, and the biasing force of the torsion spring 10 causes the rotation lock member 8 to instantly rotate from the first position to the second position (at the same time, the actuator 7 rotates from the first position to the second position), and engages with the engaged portion on the outer periphery of the wheel 9, restricting the 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 descends by rotating the shaft in a first direction and rises by rotating the shaft in a second direction, a door body fall prevention device that prevents the door body from falling (sudden descent) is provided with a locking device that restricts the rotation of the shaft in the first direction when the spring is cut. The locking device provided on the bracket 3A is provided with a rotation locking member 8 that rotates in a locking direction (locking direction) when the first coil spring 6A is cut, as the rotation restriction state due to the rotation of the actuator 7 is released, and a wheel 9 that rotates integrally with the first shaft 2A and has multiple locked parts on its outer periphery. In an emergency in which the first coil spring 6A is cut, the first shaft 2A (and the second shaft 2B) tries to rotate in the first direction due to the weight of the door body, but the rotation locking member 8 instantly locks with the locked parts of the wheel 9 in response to the spring being cut, restricting the rotation of the first shaft 2A (and the second shaft 2B) in the first direction.

12, the rotation lock member 8 according to this embodiment includes a surface portion 80, side surface portions 81 and 82 rising from the width direction ends of the surface portion 80, and an opening 83 formed in the surface portion 80. A tip 800 of the surface portion 80 serves as a locking portion, and the base end sides of the side surface portions 81 and 82 serve as rotation base ends extending beyond a rear end 801 of the surface portion 80. Insertion holes 84 are formed in the side surface portions 81 and 82 facing each other.

A spindle 315 for the pivot lock member 8 is provided at the rear side of the bracket body 31 (between the base end side of the rear end part of the side part 311 and the side part 312), and the pivot base end of the pivot lock member 8 is rotatably connected to the spindle 315. A torsion spring 10 is provided at the base end side of the pivot lock member 8 as a biasing means, and the pivot lock member 8 is biased so that the tip side protrudes forward (in the direction away from the rear part 310). In the illustrated embodiment, the coil of the spring 10 is sheathed on the spindle 315, one end is engaged with the base end of the face part 80 of the pivot lock member 8, and the other end abuts against the inner surface of the rear part 310 of the bracket body 31.

As shown in FIG. 10, the pivot lock member 8 according to this embodiment is attached to the support shaft 315 at the rear side of the bracket body 31 in an inclined position with the tip facing up and the base end facing down in a side view of the bracket body 31, with the tip facing forward (the side farther from the rear portion 310) and the base end facing rear (the side closer to the rear portion 310). The tip side portion of the pivot lock member 8 is located forward of the front end of the side portion 312.

The rotation lock member 8 is rotatable between a first position, i.e., an unlocked position (see Figs. 6 and 18), in which the tip is located relatively to the rear side (closer to the rear surface portion 310), and a second position, i.e., a locked position (see Fig. 19), in which the tip is located relatively to the front side (farther from the rear surface portion 310), and is biased by a torsion spring 10 in a direction to rotate from the first position to the second position. In Fig. 6, the rotation lock member 8 is maintained in the first position by inserting a pin 85 as a stopper into an insertion hole 84 when in the first position, thereby restricting rotation against the biasing force of the torsion spring 10. This pin 85 is used when necessary (such as during inspection) other than when the door body device (overslider) is in use, and the pin 85 is not used when in use.

When the locking device is installed, the bent piece (rotation restricting piece) 73 of the actuator 7 abuts against the rotation lock member 8 and pushes the tip side of the rotation lock member 8 toward the rear surface portion 310 against the biasing force of the torsion spring 10 to maintain the first position. When the first coil spring 6A breaks, the force acting in the direction to rotate the rotation lock member 8 from the second position to the first position (the direction of the arrow in FIG. 18) is released, the first cylindrical body 60 and the actuator 7 become free, and the biasing force of the torsion spring 10 causes the rotation lock member 8 to instantly rotate from the first position to the second position and engage with the engaged portion on the outer periphery of the wheel 9, restricting the rotation of the first shaft 2A (and the second shaft 2B) in the first direction.

[C-4-3] Wheel The wheel 9 provides a locked portion to which the rotation lock member 8 of the locking device is locked (see Fig. 19, Fig. 22 to Fig. 24). The wheel 9 rotates integrally with the first shaft 2A, and when the spring is cut, the rotation lock member 8 in the first position rotates to the second position and locks with the locked portion of the wheel 9, thereby restricting the rotation of the first shaft 2A in the first direction. The wheel 9 according to this embodiment is composed of a boss 90 that receives the first shaft 2A, and a plate-like element 91 in which convex portions 910 and concave portions 911 are alternately formed on the outer periphery in the circumferential direction and in which an opening 912 that receives the boss 90 is formed, and is configured to rotate integrally with the shaft 2A. Figs. 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 Figures 13 and 14, the plate-like element 91 of the wheel 9 according to the first embodiment has a generally pentagonal shape in a side view. More specifically, five protrusions 910 and five recesses 911 are formed on the outer periphery of the plate-like element 91 in a continuous manner, alternating in the circumferential direction. Each protrusion 910 has a circumferential dimension L1, and each recess 911 has a circumferential dimension L2. In other words, a plurality of protrusions 910 are formed on the outer periphery of the wheel 9 at a predetermined interval (L2) in the circumferential direction, and recesses 911 are formed between adjacent protrusions 910 in the circumferential direction. The circumferential dimension L2 of each recess 911 is greater than the circumferential dimension L1 of each protrusion 910.

As shown in FIG. 14, the convex portion 910 has an upper surface 914 and side surfaces 915, 915 on both sides in the circumferential direction. The upper surface 914 is a curved surface that bulges slightly. The concave portion 911 has a flat bottom surface 916, and the side surfaces 915 of the convex portion 910 also serve as the side surfaces 915, 915 on both sides in the circumferential direction of the concave portion. The lateral portions 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) are the engaging portions. The side surfaces 915, 915 extend approximately perpendicular to the bottom surface 916, but in this embodiment, as shown in FIG. 22B, the corners of the upper surface 914 and the side surface 915, and the corners of the bottom surface 916 and the side surface 915 are formed from continuous curved surfaces. In this embodiment, as shown in FIG. 22B, the connection portion between this curved surface and the bottom surface 916 also forms the engaging portion.

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

The outer peripheral surface 900 of the boss 90 and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 allow the boss 90 to be inserted into the opening 912, and in the inserted state, the outer peripheral surface 900 of the boss 90 and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 are in contact or close proximity over the entire circumference. In this inserted state, the outer peripheral surface 900 of the boss 90 and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 have shapes that allow circumferential forces to be transmitted between them (shapes that allow the boss 90 and the plate-like element 91 to rotate together).

In this embodiment, the outer peripheral surface 900 of the boss 90 and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 are in the shape of a segmented circle with at least one flat surface 900', 913' on a portion of the peripheral surface (FIGS. 14 and 15). When the boss 90 is received in the opening 912 of the plate-like element 91, the flat surface 900' and the flat surface 913' are in contact or in close proximity, so that the boss 90 and the plate-like element 91 rotate together. The shape of the outer peripheral surface 900 of the boss 90 and the shape of the inner peripheral surface 913 of the opening 912 of the plate-like element 91 are not limited to a segmented circle, and may be a shape other than a perfect circle, for example, a polygon (triangle, square, pentagon, ...), an ellipse, or a shape with a recess formed in part of a perfect circle (like the inner peripheral surface of the boss 90).

When the boss 90 is inserted into the opening 912 of the plate-shaped element 91, the outer peripheral surface 900 of the boss 90 and the first surface 91A of the plate-shaped element 91 form a first corner, and the outer peripheral surface 900 of the boss 90 and the second surface 91B of the plate-shaped element 91 form a second corner. In this embodiment, only the first corner is fillet welded 92. In this embodiment, the combination of the selection of the shape of the outer peripheral surface 900 of the boss 90 and the inner peripheral surface 913 of the opening 912 of the plate-shaped element 91 (shapes that allow circumferential forces to be transmitted between them or shapes that allow the boss 90 and the plate-shaped element 91 to rotate together) and the fillet weld 92 on one side ensures strength sufficient to withstand the impact when the rotation lock member 8 engages with the engaged portion of the wheel 9.

Figure 15A shows a boss 90' according to another embodiment, and Figure 13A shows a wheel 9 with the boss 90' shown in Figure 15A. The plate element 91 in Figure 13A is the same as the plate element 91 in Figures 13 and 14, and the description of the plate element 91 in Figures 13 and 14 can be used. The outer peripheral surface of the boss 90' shown in Figure 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, and a rising surface 900C is formed at the step between the first portion 900A and the second portion 900B. A part of the first portion 900A of the outer peripheral surface of the boss 90' is a flat portion 900A', and a part of the second portion 900B is a flat portion 900B'. A first portion 900A of the outer peripheral surface of the boss 90' and an inner peripheral surface 913 of an opening 912 of the plate-like element 91 enable the boss 90' to be inserted into the opening 912, and in the inserted state, a rising surface 900C of the boss 90' comes into contact with a second surface 91B of the plate-like element 91, thereby determining the mounting position of the plate-like element 91 relative to the boss 90'. In the inserted state, the first portion 900A of the outer peripheral surface of the boss 90' and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 are in contact or close to each other over the entire circumference, and the first portion 900A of the outer peripheral surface of the boss 90' and the inner peripheral surface 913 of the opening 912 of the plate-like element 91 have shapes that allow a circumferential force to be transmitted between them (shapes that allow the boss 90' and the plate-like element 91 to rotate integrally). In a state where the plate-like element 91 is positioned relative to the boss 90', a first corner is formed by a first portion 900A of the outer peripheral surface of the boss 90' and a first surface 91A of the plate-like element 91, and a second corner is formed by a second portion 900B of the outer peripheral surface of the boss 90' and a 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 Figures 13A and 15A, when the boss 90 is received in the opening 912 of the plate-like element 91, the rising surface 900C formed on the outer peripheral surface of the boss 90' comes into contact with the second surface 91B of the plate-like element 91, so that the mounting position of the plate-like element 91 relative to the boss 90' is determined, and welding work can be performed in the positioned state, improving the assembly workability (positioning, welding) of the wheel 9. The boss 90' is characterized in that it has an abutment surface (rising surface 900C) that allows the plate-like element 91 to be positioned relative to the boss 90' by abutting the second surface 91B of the plate-like element 91. As long as it has such an abutment surface, the shape of the second part 900B of the outer periphery is not limited, and for example, it does not have to have a flat part 900B'. In the illustrated embodiment, the step part of the first part 900A and the second part 900B, which have different outer diameters, serves as the abutment surface, but the first part and the second part of the outer periphery may have the same outer diameter, and a flange or ring-shaped protrusion with an abutment surface may be provided between the first part and the second part. In addition, the abutment surface is not limited to being formed continuously in the outer periphery direction, and may be provided as a plurality of protruding surfaces spaced apart in the outer periphery direction.

16 and 17, the plate-like element 91 of the wheel 9 according to the second embodiment has a generally rectangular shape in a side view. More specifically, four convex portions 910 and four concave portions 911 are formed alternately and continuously in the circumferential direction on the outer periphery of the plate-like element 91. As shown in FIG. 17, the convex portion 910 has an upper surface 914 and side surfaces 915, 915 on both sides in the circumferential direction, and an engagement portion is formed from the side surface 915 of each convex portion 910. The upper surface 914 is a curved surface that bulges slightly. The concave portion 911 has a flat bottom surface 916, and the side surface 915 of the convex portion 910 also serves as the side surfaces 915, 915 on both sides in the circumferential direction of the concave portion. The side surfaces 915, 915 extend generally perpendicular to the bottom surface 916. The circumferential dimension L2' of each concave portion 911 is greater 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 and circumferential dimensions of the convex portions 910 and concave portions 911, and the description of the wheel 9 according to the first embodiment can be used.

[C-4-4] Operation of the locking device With reference to Figs. 22 to 24, the behavior of the rotation lock member 8 from the unlocked state (unlocked position) until the rotation lock member 8 is locked to the locked portion of the wheel 9 (locked position) will be described. (A-1) to (A-4) on the left side of Fig. 22 show the behavior of the rotation lock 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 lock member 8 with respect to the wheel 9 according to the first embodiment. The left and right sides differ only in the configurations of the wheels 9 and 9', and the rotation lock member 8 is the same. Note that no opening 83 is provided on the surface 80 of the rotation lock member 8.

In the embodiment on the left side of FIG. 22, the wheel 9' has six convex portions 910' and six concave portions 911' formed alternately in the circumferential direction, and the circumferential dimension of each convex portion 910' and the circumferential dimension of each concave portion 911' are approximately the same. In the embodiment on the left side of FIG. 22, when the spring is cut, the wheel 9' starts to rotate in the direction of the arrow, and the rotation lock member 8 is released from the rotation restriction and starts to rotate in the direction of the arrow. As shown in (A-1), when the rotation lock member 8 starts to rotate, the distance between the tip of the surface portion 80 of the rotation lock member 8 and the nearest convex portion 910' is relatively short, so that, as shown in (A-2), the rotation lock member 8 does not engage with the convex portion 910', and the inner surface of the surface portion 80 may ride up the convex portion 910' (so-called tooth skipping). In this case, as shown in (A-3) and (A-4), the wheel 9' continues to rotate until it engages with the next protrusion 910', causing the shaft to rotate in the first direction and the door body to fall.

22, the number of convex portions and concave portions is reduced compared to the left-hand embodiment, and the circumferential dimension of each concave portion 911 is made larger than the circumferential dimension of each convex portion 910, thereby increasing the circumferential dimension of the concave portion 911 while maintaining the strength of the convex portion 910. In the right-hand embodiment, when the spring is cut, the wheel 9 starts to rotate in the direction of the arrow, and the rotation lock member 8 is released from the rotation restriction and starts to rotate in the direction of the arrow. As shown in (B-1), when the rotation lock member 8 starts to rotate, the distance between the tip of the face portion 80 of the rotation lock member 8 and the nearest convex portion 910 is relatively large, and as shown in (B-2), the tip side of the rotation lock member 8 is in a position to drop into the concave portion 911 of the wheel 9, and when the wheel 9 further rotates in the first direction, as shown in (B-3), the tip of the rotation lock member 8 abuts against the side portion (side surface 915) of the convex portion 910 and is locked. FIG. 22A shows a partial enlarged view of FIG. 22(B-2). When the inner surface 802 of the face portion 80 of the rotation lock member 8, which is rotating in the direction of the arrow, rides up on the upper surface 914 (the side closer to the side surface 915) of the convex portion 910 of the wheel 9, the tip side of the rotation lock member 8 assumes a posture in which it drops into the recess 911. In this posture, the inner edge 800A of the tip 800 abuts against the bottom surface 916 of the recess 911. At this time, the rotation lock member 8 is subjected to a force by the torsion spring 10 in a direction pressing the edge 800A against the bottom surface 916, but since the angle formed by the bottom surface 916 and the inner surface (flat surface) 802 of the face portion 80 at this time is small, the resistance is extremely small, and the wheel 9 rotates in the α direction, so that the edge 800A engages with the side portion of the convex portion 910 while sliding against the bottom surface 916. Depending on the timing, the inner edge 800A of the tip 800 may directly engage with the side portion of the convex portion 910 without sliding against the bottom surface 916. FIG. 22B is a partially enlarged view of FIG. 22 (B-3), showing the engagement state (locked state) between the engagement portion of the rotation lock member 8 and the engaged portion of the wheel 9, and 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 lock member 8 engages with the connection portion between the side surface 915 of the convex portion 910 and the bottom surface 916 of the recess 911, and the outer edge 800B of the tip 800 engages with the side portion of the convex portion 910.

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

As shown in FIG. 12, in the right-hand embodiment, an opening 83 is formed in the surface 80 of the rotation lock member 8, through which the protrusion 910 of the wheel 9 can enter. The width of the opening 83 is greater than the thickness of the wheel 9 (i.e., the protrusion 910), and the vertical width of the opening 83 (the dimension between the edge 830 on the tip side and the edge 831 on the base side) is smaller than the circumferential dimension of the protrusion 910. When the protrusion 910 of the wheel 9 enters the opening 83, rotation of the wheel 9 in a first direction is permitted, and rotation in a second direction is restricted.

In the left-hand embodiment, no opening 83 is formed in the surface 80 of the rotation lock member 8, and as shown in (A-2), the inner surface of the surface 80 rides up onto the convex portion 910, temporarily restricting rotation in the locking direction. Then, as shown in (A-3), the tip side of the rotation lock member 8 falls into the concave portion 911. When the wheel 9 rotates further in the first direction, as shown in (A-4), the tip of the rotation lock member 8 abuts against the side portion of the convex portion 910, resulting in an engaged state.

In the right-side embodiment, an opening 83 is formed in the surface 80 of the rotation lock member 8, and as shown in (B-2), the convex portion 910 enters the opening 83 of the surface 80, and the tip side of the rotation lock member 8 quickly falls into the recess 911. At this time, the upper surface 914 of the convex portion 910 is close to or in contact with the edge portion 831 on the base end side of the opening 83, but even when the convex portion 910 enters the opening 83, the rotation of the wheel 9 in the first direction is permitted, and as shown in (B-3), the rotation lock member 8 maintains the position in which the tip falls into the recess 911, and as the wheel 9 rotates in the first direction, the convex portion 911 comes out of the opening 83, and when the wheel 9 further rotates in the first direction, the tip of the rotation lock member 8 abuts against the side portion of the convex portion 910, and is locked, as shown in (B-4). Figure 23A shows a partial enlarged view of Figure 23 (B-2). When the inner surface 802 of the face 80 of the rotation lock member 8, which is rotating in the direction of the arrow, rides up on the upper surface 914 (the side closer to the side surface 915) of the convex portion 910 of the wheel 9, the convex portion 910 immediately enters the opening 83 formed in the face, and the tip side of the rotation lock member 8 falls into the recess 911. In this position, the inner edge 800A of the tip 800 abuts against the bottom surface 916 of the recess 911. At this time, the rotation lock member 8 is subjected to a force by the torsion spring 10 in a direction pressing the edge 800A against the bottom surface 916, but the angle formed by the bottom surface 916 and the inner surface (flat surface) 802 of the face 80 at this time is small, so the resistance is extremely small, and as the wheel 9 rotates in the direction of α, the edge 800A engages with the side portion of the convex portion 910 while sliding against the bottom surface 916.

Referring to FIG. 24, we will explain how to prevent reverse rotation of the wheel 9 when the locking device is activated. When the spring is cut, the locking device restricts the rotation of the shaft that is trying to rotate in the first direction due to the weight of the door body by engaging the rotation locking member 8 with the engaged portion of the wheel 9. However, the wheel 9 may reverse due to the reaction force when locked. As shown in FIG. 24 (A-1) and (A-2), if the wheel 9 rotates in the reverse direction when locked, the tip of the rotation locking member 8 and the engaged portion separate, and the surface portion 80 of the rotation locking member 8 may ride up on the adjacent protrusion 910, causing the locked state (engaged state) to be released. Furthermore, the rotation of the wheel 9 is accelerated when the wheel 9 rotates forward again, which may cause malfunction (e.g., tooth skipping).

In this embodiment, this defect can be solved by adopting a rotation lock member 8 having an opening 83 on the surface portion 80. When the wheel 9 rotates in the second direction from the locked state of FIG. 24 (B-1), the adjacent convex portion 910 enters the opening 83 of the surface portion 80 of the rotation lock member 8, resulting in the state of (B-2). At this time, the edge portion 830 on the tip side of the opening 83 engages with the side surface (engaged portion) 915 of the adjacent convex portion 910, restricting the rotation of the wheel 9 in the second direction. During normal rotation, as shown in FIG. 23 (B-3), the wheel 9 rotates in the first direction, causing the convex portion 911 to come out of the opening 83, and when the wheel 9 further rotates in the first direction, the tip of the rotation lock member 8 abuts against the side portion of the convex portion 910, returning to the locked state of FIG. 24 (B-1). FIG. 24A is a partial enlarged view of FIG. 24 (B-2). When the wheel 9 rotates in the β direction from the engaged state (locked state), the side surface 915 of the convex portion 910 moves away from the tip 800 of the surface portion 80 of the rotation lock member 8, and the adjacent convex portion 910 (the corner formed by the top surface 914 and the side surface 915) enters the opening 83 of the surface portion 80 of the rotation lock member 8, and the side surface 915 abuts and engages against the edge portion 830 of the opening 83 so that it faces the opening, restricting the rotation of the wheel 9 in the β direction.

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

As shown in FIG. 26, the detection switch 11 comprises a switch body 110 and a lever 111 rotatably attached to the switch body 110. The switch body 110 comprises a contacted portion 112 with which the lever 111 can come into contact, and wiring 113 extends from the switch body 110. The switch body 110 is a rectangular parallelepiped with a rectangular shape in a plan view, and insertion holes 114, 114 that penetrate in the thickness direction are formed in the diagonally opposite corners. The detection switch 11 is in the ON state when the lever 111 is in contact with the contacted portion 112, and in the OFF state when the lever 111 is in a non-contact state away from the contacted portion 112, and the lever 111 is biased in a direction to maintain the non-contact state.

In this embodiment, the detection switch 11 is attached in an inclined position to the upper portion of the inner surface of the side portion 311 of the bracket main body 31. The detection switch 11 is positioned and fixed so that the tip portion of the lever 111 is located within the movable range of the bent piece 73 of the actuator 7. Normally, the bent piece 73 of the actuator 7 presses the lever 111 so that the lever 111 maintains contact with the contacted portion 112, and the detection switch 11 is in the ON state (FIG. 18). When the spring is broken, the rotation lock member 8 rotates from the first position to the second position due to the biasing force of the torsion spring 10 of the rotation lock member 8, and the actuator 7 is pushed and rotated from the first position to the second position, and the bent piece 73 of the actuator 7 and the tip side of the lever 111 are separated, so that the lever 111 rotates and changes from a contact state to a non-contact state, and the spring break is detected by detecting the change from the ON state to the OFF state (FIG. 19).
Furthermore, even if the actuator 7 rotates from the first position to the second position and rotates in a recoil direction back to the first position, the bent piece 73 of the actuator 7 abuts against the rotation lock member 8 engaged with the engaged portion of the wheel 9, so the lever 111 will not return to the position where the detection switch is turned ON.

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

The switch body 110 of the detection switch 11 is placed on one side of the mounting plate 12, and the detection switch 11 and mounting plate 12 are fixed together with a screw (bolt) 115 and a female screw (nut) 116 that pass through the insertion holes 114 and 120. The detection switch assembly consisting of the detection switch 11 and mounting plate 12 is shown in Figure 25. The detection switch 11 is prepared as a detection switch assembly, and the detection switch assembly is fixed to the side portion 311 of the bracket body 31.

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

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 can move 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 part 311, located below the insertion hole 121. When the detection switch assembly is placed on the upper part of the inner surface of the side part 311, the openings 117 are aligned with the heads of the screws 115 that secure the switch body 110 and the mounting plate 12, and are adapted to receive the heads. The diameter of the openings 117 is larger than the diameter of the heads of the screws 115, and the heads of the screws 115 move through the openings 117 when adjusting the position of the detection switch assembly. As shown in FIG. 10, the female screws 122 and the openings 117 are formed in both the upper and lower parts of the side part 311 of the bracket body 31, and the bracket body 31 used for the bracket 3A can be used for the bracket 3B by flipping it upside down and left and right.

With reference to FIG. 29, the adjustment of the mounting position of the detection switch 11 will be described. 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 the screw 123 that mounts the detection switch assembly to the side portion 311. In the upper figure, the insertion hole 121 is mounted in a mounting position shifted upward relative 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. In the middle figure, the insertion hole 121 is mounted in a mounting position shifted leftward relative to the shaft portion 124 of the screw 123, and it can be seen that the detection switch 11 is located leftward compared to the upper and lower figures. In the lower figure, the insertion hole 121 is mounted in a mounting position shifted rightward relative to the shaft portion 124 of the screw 123, and it can be seen that the detection switch 11 is located rightward compared to the upper and middle figures. By fine-tuning the mounting position of the detection switch 11, for example, it is possible to fine-tune the relative positional relationship between the tip end portion of the lever 111 and the bent piece 73 of the actuator 73.

[C-6] Installation process of the wire winding mechanism As shown in FIG. 3, the wire winding mechanism 1 according to this embodiment is supported by brackets 3A, 3B, 4A, 4B, 5A, and 5B provided in a predetermined portion of the body 13 across the width. The brackets 4A, 4B, 5A, and 5B have insertion grooves (not shown) for the shafts 2A and 2B formed in the rising surface portions from the front end toward the rear, and are capable of receiving and supporting the shafts 2A and 2B of the winding mechanism 1 from the front. 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 the width direction ends of the rear surface portion 300, and is fixed to the body 13 via the rear surface portion 300. The bracket main body 31 has a rear portion 310 and left and right side portions 311, 312 that rise forward from the widthwise ends of the rear portion 310, and is inserted from the front into the space between the left and right side portions 301, 302 of the mounting base 30, with the rear portion positioned in the space and attached to the mounting base 30 in a protruding manner toward the front.

The mounting base 30 of the brackets 3A and 3B is attached to the main body 13 in the same manner as the other brackets 4A, 4B, 5A, and 5B, while the bracket 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 portion (part 311') of the side part 311 of the bracket body 31, and the wheels 9 that are located inside the part 311' and that constitute the locking device are fixed to the first shaft 2A and the second shaft 2B. In addition, the components of the door body drop prevention device (the actuator 7, the rotating lock member 8 that constitutes the locking device, etc.) are supported on the part 311'. The bracket body 31 is attached to the mounting base 30 integrally with the other components of the wire winding mechanism 1.

A horizontal bent piece 303 is formed at the lower end of the side portion 301 of the mounting base 30, located below the insertion space of the rear portion of the bracket body 31, and is capable of supporting the bracket body 30 when the rear portion of the bracket body 31 is inserted into the space between the side portions 301, 302 of the mounting base 30. The bracket body 31 is attached to the mounting base 30 as a component of the wire winding mechanism 1, so that the lower end 316 of the bracket body 31 is placed on the bent piece 303 of the mounting base 30 for temporary support, improving the workability of fixing the bracket body 31 to the mounting base 30.

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

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

As shown in Figures 30(A) and 31(A), when the bracket body 31 is inserted into the space between the left and right side portions 301, 302 of the mounting base, the lower end 316 of the bracket body 31 (equipped with a door body fall prevention device) is temporarily supported by the bent piece 303 at the lower end. At this time, the upper bent piece 304 is located just above the upper end 317 of the bracket body 31 (equipped with a door body fall prevention device), preventing the front part of the bracket body 30 from falling downward. In the temporarily supported state, the mounting position of the bracket body 30 relative to the mounting base 30 is adjusted, and bolts 32 are inserted from the left and right side portions 301, 302 of the mounting base 30 and connected to nuts 33 provided on the side portions 311, 312 of the bracket body 31, completing the fixing of the bracket body 31 to the mounting base 30 (Figures 30(C) and 31(C)).

In Figures 30 and 31, only a portion of the wire winding mechanism is shown, but in this embodiment, the bracket main body 31 is not fixed to the mounting base 30 alone, but the wire winding mechanism is supported and fixed as a whole to the mounting base 30 of bracket 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 assembling the first winding drum 1A, the first shaft 2A, the first coil spring 6A, the bracket body 31, 31, the second shaft 2B, the second coil spring 6B, and the second winding drum 1B to prepare a winding assembly; fixing the multiple brackets 4A, 4B, 5A, 5B and the mounting bases 30, 30 to predetermined locations of the body 13; supporting the winding assembly from the front by the multiple brackets 4A, 4B, 5A, 5B and the mounting bases 30, 30; and fixing the winding assembly to the multiple brackets 4A, 4B, 5A, 5B and the mounting bases 30, 30; and the above description can be used for the installation process of the bracket body 31 to the mounting base 30.

In this embodiment, the mounting base 30 is fixed to the body 13 by an anchor bolt 305, and the shaft of the anchor bolt 305 protruding from the body 13 is inserted through the mounting hole 3000 in the rear part 300 of the mounting base 30. When the bracket body 31 is attached to the mounting base 30, the rear part 300 of the mounting base 30 and the rear part 310 of the bracket body 31 face each other at a distance, but the rear part 310 of the bracket body 31 has an opening 3100 formed opposite the mounting hole 3000, and the opening 3100 is an insertion hole through which the anchor bolt 305 can be inserted. Therefore, as shown in FIG. 33, even if the rear part 300 of the mounting base 30 and the rear part 310 of the bracket body 31 are close to each other, the opening 3100 can receive and release the anchor bolt 305 when the bracket body 31 is attached to the mounting base 30.

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

Claims (6)

a boss capable of receiving a shaft;
A plate-like element having a plurality of engagement portions on an outer periphery and an opening for receiving the boss;
It consists of:
On the outer periphery, convex portions and concave portions are formed alternately and continuously in the circumferential direction, and side portions of each convex portion serve as the plurality of engaged portions,
A circumferential dimension of each recess is greater than a circumferential dimension of each protrusion,
The outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element are
The boss can be inserted into the opening, and has a shape that allows a circumferential force to be transmitted between the boss and the opening when the boss is inserted.
In the inserted state, at least a part of a first corner formed between the outer peripheral surface of the boss and the first surface of the plate-like element and a second corner formed between the outer peripheral surface of the boss and the second surface of the plate-like element are welded.
wheel. Only one of the first corner portion and the second corner portion is welded.
2. A wheel as claimed in claim 1. The outer peripheral surface of the boss and the inner peripheral surface of the opening of the plate-like element are semicircular with at least one flat surface on a part of the peripheral surface.
A wheel according to claim 1 or 2. An abutment surface is formed on the outer peripheral surface of the boss, against which one of the first surface and the second surface of the plate-like element can abut.
A wheel according to any one of claims 1 to 3. A wheel according to any one of claims 1 to 4;
A locking member capable of being engaged with the engaged portion;
Equipped with
The boss receives the shaft so as to rotate integrally with the shaft,
In use, the engaged portion and the locking member are in an unlocked state, allowing the shaft to rotate freely, and in an emergency, the locking member engages with the engaged portion to restrict the rotation of the shaft. A fall prevention device for a door body comprising the lock device according to claim 5,
The door body is lowered by rotating the shaft in a first direction, and the door body is raised by rotating the shaft in a second direction.
A force that rotates the shaft in a first direction is applied to the shaft by the weight of the door body,
the shaft is provided with a spring that is wound and stored by rotation of the shaft in a first direction and released by rotation of the shaft in a second direction;
In the event of an emergency in which the spring breaks, the shaft will attempt to rotate in a first direction due to the weight of the door body, but the locking member will instantly engage with the engaged portion in response to the spring breaking, restricting the rotation of the shaft in the first direction.
Device to prevent door body from falling.

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