JP4884766B2 - Overhead door descent stop device - Google Patents

Description

The present invention relates to a sudden descent stop device for an overhead door, and more particularly to a device for stopping a sudden descent of a door body when a wire that holds the door body is cut.

Overhead doors are composed of a plurality of panels that can be pivoted up and down to form a door body, and guide rollers provided at both ends in the width direction of each panel extend from the left and right ends of the opening along the ceiling. The opening is opened and closed by being guided by the guide rail that comes out. A winding body for winding the wire is disposed above the opening. One end of the wire is connected to the drum of the winding body, and the other end of the wire is connected to the lowest panel constituting the door body, and the opening and closing of the door body is lifted by winding and feeding the wire to open and close the opening. .

Several technical means have been proposed for the purpose of stopping the sudden lowering of the door body when the wire is cut when the door body is raised and lowered. The sudden lowering stop means for the door body is disclosed in, for example, Patent Document 1. ing. The present applicant further provides a rotating body provided with a blade in the lowest panel constituting the door body, and the rotating body rotates when the wire is cut, and the blade of the rotating body bites into the guide rail. We developed a sudden descent stop device that stops the descent of the door body by stopping.

However, in the case of stopping the lowering of the door body by locking the blade of the rotating body to the guide rail, since the blade is made of a material having high hardness to bite into the guide rail, the operation of the sudden lowering stop mechanism It is necessary to take care so that other parts, fingers, etc. do not touch the blade at normal times other than the time.

In particular, in an overhead door that is manually operated using an operation rope, the lower end of the operation rope is connected to the lowest panel, so the operation rope contacts the blade that is also fixed to the lowest panel. Can be damaged or severed.
JP-A-8-260840

An object of the present invention is to prevent a component or the like from coming into contact with a blade in a sudden descent stop device in which the blade is locked to a guide rail at the time of wire cutting except when the sudden descent stop device is operated. is there.

The technical means employed by the present invention in order to achieve such a problem are a base member fixed to a door body, a rotating body rotatably connected to the base member, and a rotating body connected to the rotating body. A blade assembly provided with a blade that is locked to the guide rail by the rotation of the rotating body, and means for biasing the rotating body so as to rotate in a direction in which the blade is locked to the guide rail; The rotation of the rotating body by the urging means is regulated by the tension of the wire that suspends the door body connected to the rotating body (the rotation direction by the urging means and the rotation by the tension). The blade is configured to be locked to the guide rail by rotating the rotating body by wire cutting, and the blade assembly has guard means. And the guard means , The object to the blade except during rotation of the rotary body is intended to restrict the contacting. The rotating body may be a single member or may be composed of a plurality of members.

The guard means is a blade guard, and the blade guard is located on the opposite side to the rotating direction of the rotating body by the biasing means and protrudes beyond the tip of the blade. It is provided in the blade assembly, and in a state where the rotation of the rotating body is restricted, the blade guard protrudes toward the guide rail from the tip of the blade, thereby restricting the object from contacting the blade. When the rotating body is rotated, the tip of the blade is configured to be locked to the guide rail before the blade guard. In a more specific example, the blade guard is provided on the opposite side of the blade in the direction of rotation by the urging means, is spaced apart from the blade by a predetermined dimension, and the blade guard It protrudes by a predetermined dimension from the tip. The “predetermined dimension” means that the operation rope or the like is prevented from coming into contact with the tip of the blade, and when the sudden descent stop device is activated, the guard portion of the blade guard is ahead of the tip of the blade. The size of the blade is such that the blade can securely bite into the guide rail without being in contact with the guide rail.

The guard means includes a side cover that covers the side of the blade. As the guard means, both a blade guard and a side cover may be provided. In this case, the side cover covers the blade and the side of the blade guard. In a further aspect, the blade assembly is provided outside the rotating body, and one end side of the operation rope is fixed to the outer surface of the side cover.

The side cover as the guard means can be employed independently of the blade guard. In this case, the technical means adopted by the present invention are connected to the base member fixed to the door body, the rotating body rotatably connected to the base member, and the outside of the rotating body, A blade assembly having a blade that is locked to the guide rail by the rotation of the rotating body; and a means for biasing the rotating body so as to rotate in a direction in which the blade is locked to the guide rail. Then, the rotation of the rotating body by the biasing means is regulated by the tension by the wire that suspends the door body connected to the rotating body, and the rotating body rotates by cutting the wire, The blade is configured to be locked to the guide rail, and the blade assembly includes a side cover that covers the blade from the side, and preferably, on the outer surface of the side cover. One of the operation ropes Side is fixed.

In the technical means, in the blade assembly having a side cover, in one aspect, the device further includes a cover body that covers an upper side of the component of the device, and an upper end portion of the side cover The bent portion is formed so as to close the gap between the cover body and the blade assembly. This prevents the operation rope from entering through the gap between the cover body and the blade assembly and wrapping around the parts or coming into contact with the blade.

In the technical means, in one aspect, the apparatus further includes an operation rope guard, the operation rope guard covers the blade assembly and the guide rail, and a tip thereof is adjacent to the guide rail mounting surface. Yes. In this case, in order to prevent the operation rope from entering the inside of the operation rope guard, the operation rope touches the blade and is damaged or cut regardless of whether the operation rope is fixed outside or inside the device. It will not be done.

Providing a guard means to the blade assembly that restricts the object from coming into contact with the blade other than when the rotating body is rotating, making it difficult to access the blade and possibly causing the operation rope, fingers, etc. to contact the blade Reduce.

If the blade assembly is equipped with a blade guard, the blade guard prevents the operation rope, fingers, etc. from coming into direct contact with the blade, and the blade guard locks the guide rail when the sudden descent stop device is activated. Does not prevent you from doing.

If the blade assembly is provided with a side cover that covers the blade from the side, it is difficult to access the blade, and the possibility that an operation rope, a finger, or the like contacts the blade is reduced.

In the case where the blade assembly is provided outside the rotating body and the blade assembly has a side cover, one end side of the operation rope is fixed to the outer surface of the side cover. Since it is on the outside, the operating rope is prevented from getting entangled with the sudden descent stop device, and the operating rope is prevented from coming into contact with the floor surface and becoming dirty or deteriorated.

A basic configuration of the overhead door will be described. As shown in FIGS. 1 and 2, a door body 1 of an overhead door is configured by connecting a plurality of panels 1a extending in the opening width direction in the vertical direction via hinges 1b. The panels 1a are connected to each other so as to be rotatable. Guide rollers 1c are rotatably supported at both ends of the panel 1a in the width direction. Left and right guide rails 2 for guiding the door body 1 are provided at both ends in the width direction of the opening. Each guide rail 2 is positioned at the end in the width direction of the opening and extends in the vertical direction, and extends in a slanting manner along the ceiling while being curved at a site above the opening. The door body 1 is movable along the guide rail 2 by the guide roller 1c being guided by the left and right guide rails 2, and the door body 1 is accommodated in the inclined portion 2b of the guide rail 2. When the door body 1 is housed in the vertical portion 2a of the guide rail 2, the opening is closed. In FIG. 1, a two-dot chain line is a line indicating the course of the door body 1.

On the ceiling above the opening, a winding body 3 is provided that is positioned above the door pair in a vertical posture when the opening is fully closed and extends in the opening width direction. The winding body 3 is configured by connecting two shafts 3a via a coupling 3b. A balance spring 3c is mounted near the connecting portion of each shaft 3a. The drum 3d around which the wire 4 is wound is provided at both end portions (end portions on the side of each shaft 3a that are separated from each other) (the wires are omitted in FIGS. 1 and 2). One end of the wire 4 is connected to the drum 3d, and the other end of the wire 4 is connected to the lowest panel 1a. As the winding body 3 rotates in one direction, the wire 4 is wound around the drum 3d and the door body 1 moves up, and as the winding body 3 rotates in the other direction, the wire 4 is fed out of the drum 3d. The door body 1 is lowered.

The winding body 3 is urged by a balance spring 3c in a direction in which the wire 4 is wound around the drum 3c. When the opening is fully closed, if a force that lifts the door 1 upward is applied to the door 1 that closes the opening, the winding body 3 rotates in the direction of winding the wire 4 around the drum 3d. As the wire 4 is wound up, the door body 1 rises to open the opening. When the opening is fully opened, the operation rope 5 connected to the door body 1 is pulled to rotate the winding body 3 so that the door body 1 is lowered by its own weight and closes the opening. A mode of attaching the operation rope 5 will be described later.

At both ends in the width direction of the lowest panel 1a constituting the door body 1, there are provided door body sudden descent stop devices 6 that stop the sudden descent of the panel 1a when the wire 4 is cut. The sudden descent stop device 6 is attached to a portion where the guide roller 1c of the lowest panel 1a is attached. The sudden descent stop device 6 includes a base plate 7 fixed to the lowest panel 1a constituting the door body 1, a rotating body 8 rotatably connected to the base plate 7, and a blade fixed to the rotating body 8. An assembly 9. The blade assembly 9 is fixed on the outer side with respect to the rotating body 8. In this specification, in the front view of FIG. 2, the direction in which the left and right ends of the door body 1 approach is “inside”, and the direction in which the left and right ends of the door body 1 are separated from each other is “outside”. The door body descent stop device 6 according to the present invention can also be applied to an overhead door of a type in which the lifting operation of the door body is performed using a chain hoist device, or an electrically driven overhead door.

The base plate 7 is formed in a substantially U shape in a sectional view from a bottom piece 70 attached to the surface portion of the panel 1a and opposing side pieces 71 and 72.

The rotating body 8 includes a bracket 80 rotatably attached to the base plate 7, an arm 81, a pivot 82, a spring 83 as an urging means for urging the rotating body (bracket 80 + arm 81) in a predetermined direction, Consists of The bracket 80 is formed from a bottom piece 800 and opposing side pieces 801 and 802 in a substantially U-shape or U shape in cross section, and the bottom piece 800 is spaced apart and opposed to the bottom piece 70 of the base plate 7 so that the side pieces 801 and 802 are opposed to each other. Are mounted on the outside of the side pieces 71 and 72 so as to rotate around the pivot 82. A spring 83 is externally mounted on the pivot 82, and the spring 83 biases the rotating body 8 in a direction in which the blade 91 of the blade assembly 9 bites into the guide rail 2 and is locked. In the illustrated embodiment, the roller shaft 10c of the guide roller 1c and the pivot shaft 82 coincide with each other. Specifically, the pivot 82 is formed of a cylindrical pipe-like member, and the roller shaft 10c of the guide roller 1c is inserted and fixed in the hollow portion of the pivot 82. The base plate 7 and the bracket 80 are supported by inserting the roller shaft 10c through the pivot 82, and constitute a member for attaching the guide roller 1c to the panel 1a.

The arm 81 is a plate member extending in the expected direction of the panel 1a. The arm 81 extends beyond the bottom piece 70 of the base plate 7 to the side of the panel 1a, and at its end, a connecting portion 810 of the wire 4 is formed on the side of the panel 1a. (See FIG. 10). The arm 81 is provided with a shaft portion 811 which is located on the lower side and extends in a direction orthogonal to the surface portion of the arm 81, and the shaft portion 811 penetrates the side pieces 802 and 801 of the bracket 80. The side piece 801 is prevented from coming off. In the arm 81, an engaging portion 81 </ b> A is formed at an edge that is separated from the connecting portion 810 with the pivot 82 interposed therebetween, and the engaging portion 81 </ b> A is an extended portion 90 a of the blade base 90 of the blade assembly 9 ( The upper end edge of the base end side of the surface portion 900) is engaged from above. The blade assembly 9 is fixed to the bracket 80. Normally, the connecting portion 810 of the arm 81 is pulled upward by the wire 4, and the engaging portion 81A presses the upper end edge on the proximal end side of the extending portion 90a. Therefore, the upward rotation of the bracket 80 by the urging force of the spring 83 is restricted. When the wire 4 is cut and the upward pulling force at the connecting portion 810 is lost, the arm 81 is not pressed, and the bracket 80 is rotated upward, so that the blade assembly 9 and the arm 81 are rotated upward together. To do. The arm 81 is formed with an arc-shaped elongated hole 812, the pivot shaft 82 is located at one end of the elongated hole 812 (the end near the connecting portion 810), and the arm 81 has an elongated hole 812. It rotates together with the bracket 80 around the pivot 82 located at one end. In this embodiment, the arm 81 is movable with respect to the bracket 80, and is opened to the position where the lowermost panel 1a is applied to the R rail formed on the upper side of the vertical portion 2a at the time of mounting or maintenance. In this case, the position of the arm 81 can move along the elongated hole 812 with respect to the pivot 82. Specifically, the shaft portion 811 of the arm 81 comes into contact with a recess 720 formed at the lower end edge of the side pieces 71 and 72 of the base plate 7 so that the arm 81 can rotate around the shaft portion 811. Yes. As described above, in the present embodiment, the rotating body 8 includes the bracket 80 and the arm 81 that is movable with respect to the bracket 80, but the bracket 80 and the arm 81 that is integrated with respect to the bracket 80. The rotating body 8 may be configured.

In the arm 81, the blade assembly 9 is disposed at an end portion that is separated from an end portion where the connecting portion 810 is formed. In the illustrated embodiment, the blade assembly 9 is fixed to the bracket 80 as will be described later. That is, the rotating body 8 is rotatable around the pivot 82, and the lower end of the wire 4 is connected to one end side via the connecting portion 810 with the pivot 82 being sandwiched, and the other end side is connected to the other end side. The blade assembly 9 is fixed. The rotating body 8 is urged by a spring 83 in a direction in which the blade of the blade assembly 9 bites into and engages with the vertical portion 2a of the guide rail 2 (rotating upward in the illustrated example). The wire 4 connected to one end of the rotating body 8 is pulled upward by the wire 4 connected to the end where the blade assembly 9 is connected. The power is balanced and the rotation of the rotating body 8 is restricted.

The blade assembly 9 includes a blade base 90 that is brought into contact with the bottom piece 800 of the bracket 80 and fixed by screws, and a blade 91 and a blade guard 92 that are fixed to an extension portion 90 a of the blade base 90. In the illustrated embodiment, the extending portion 90a of the blade base includes a surface portion 900 extending in the direction of finding the panel 1a and a mounting piece 901 extending substantially horizontally from a substantially central portion in the height direction of the surface portion 900. A blade 91 is attached to the upper surface of the attachment piece 901, and a blade guard 92 is attached to the lower surface of the attachment piece 901. The blade 91 and the blade guard 92 are spaced apart by the thickness of the mounting piece 901 and extend in parallel.

The blade 91 includes a plate-like base portion 910 and a tip portion 911 that are attached to the upper surface of the mounting piece 901. The tip end portion 911 of the blade 91 extends in the direction of finding the panel 1 a in parallel with the pivot shaft 82. The rotating body 8 is urged by a spring 83 provided on the pivot 82 in a direction in which the tip end portion 911 of the blade 91 of the blade assembly 9 bites into and engages with the guide rail 2a.

The blade guard 92 includes a base portion 920 that is mounted on the lower surface of the mounting piece 901, and a guard portion 921 that is integrally formed on the distal end side of the base portion 920. The peripheral surface of the guard portion 921 is formed in an R shape. Yes. The guard portion 921 extends in parallel to the tip portion 911 of the blade 91, and the guard portion 921 protrudes from the tip portion 911 of the blade 91 by a predetermined dimension D1. In one embodiment, the tip of the guard part 921 of the blade guard 92 protrudes 3.5 mm from the tip part 911 of the blade. Further, the tip end portion 911 of the blade 91 and the guard portion 921 of the blade guard 92 are separated by a predetermined dimension D2. More specifically, the guard portion 921 of the blade guard 92 protrudes by a predetermined dimension D1 in the extending direction of the blade 91 from the tip portion 911 of the blade 91, and the guard portion 921 of the blade guard 92 It is separated from the tip end portion 911 of 91 by a predetermined dimension D2 in a direction orthogonal to the extending direction of the blade 91. These predetermined dimensions D1 and D2 prevent the operation rope 5 and the like from coming into contact with the tip end portion 911 of the blade 91, and when the sudden descent stop device is activated, the guard portion 921 of the blade guard 92 is The dimensions are set such that the blade 91 can securely bite into the guide rail 2a without being brought into contact with the guide rail 2a before the tip 911.

The operation of the blade assembly 9 including the blade guard 92 will be described. FIG. 11A shows the blade assembly 9 provided with the blade guard 92, and FIG. 11B shows the blade assembly without the blade guard 92. As shown in FIG. 11A, in a normal state, both the blade 91 and the blade guard 92 extend substantially horizontally, and the blade guard 92 protrudes from the blade 91 in a substantially horizontal direction by a predetermined dimension D1. Therefore, even when the operation lobe 5 that hangs down near the blade 91 of the blade assembly 9 approaches, the operation rope 5 does not contact the blade 91 because the operation rope 5 contacts the blade guard 92 first. On the other hand, as shown in FIG. 11B, when there is no blade guard 92, when the operation lobe 5 that hangs down near the blade 91 of the blade assembly 9 comes, the operation rope 5 becomes the blade. 91 will be contacted.

FIG. 12 is an operation explanatory view showing a state where the blade assembly 9 including the blade guard 92 is rotated. As described above, the rotating body 8 (bracket 80) to which the blade assembly 9 is fixed is urged by the force of the spring 83 so that the side on which the blade assembly 9 is mounted is rotated upward. Since the other end side of the moving body 8 is pulled upward by the wire 4, the tension by the wire 4 acts in the opposite direction to the urging force by the spring 83, and the rotation of the rotating body 8 is restricted. In this state, when the wire 4 is cut, there is no force to pull the other end of the rotating body 8 upward, and the side of the rotating body 8 on which the blade assembly 9 is mounted is rotated upward by the force of the spring 83. Here, the blade guard 92 is located on the side opposite to the rotation direction by the spring 83 with respect to the blade 91, that is, the blade 91 is on the same side (upper side) as the rotation direction with respect to the blade guard 92. The blade 91 first bites into the guide rail 2a and is locked. The dimensions D1 and D2 between the blade 91 and the blade guard 92 are set to dimensions such that the blade guard 92 does not contact the guide rail 2a when the rotating body 8 rotates (when the sudden descent stop device operates).

The blade assembly 9 further includes a side cover 93. The side cover 93 has an L shape in sectional view from the side surface portion 930 and the base portion 931, and a bent portion 932 is formed on the upper portion of the base portion 931. The side cover 93 is fixed with screws by bringing the base portion 931 into contact with the surface portion 900. The side surface portion 930 covers both the blade 91 and the blade guard 92 from the side. An eye bolt 50 is fixed to the outer side surface of the side surface portion 930, and one end side of the operation rope 5 is fixed to the side surface portion 930 of the side cover 93 using the eye bolt 50. The technical idea of providing the side cover 93 on the blade assembly 9 can be established independently of the technical idea of providing the blade guard 92, and can be applied to a blade assembly that does not have the blade guard 92. is there.

As shown in FIG. 13, the blade assembly 9 is located outside the sudden descent stop device 6, and an eyebolt 50 is fixed to the outer surface of the side surface portion 930, and one end of the operation rope 5 is used with the eyebolt 50. The side is connected to the side surface portion 930 of the side cover 93. An attachment plate 51 for fixing the operation rope 5 to the housing side is provided at a predetermined height above the eyebolt 50, and the other end side of the operation rope 5 is connected to the attachment plate 51. An extension rope 5 a is connected to a substantially intermediate portion in the length direction of the operation rope 5. The mounting plate 51 may be fixed to the guide rail 2a or may be fixed to the mounting surface on which the guide rail 2a is mounted.

FIG. 14 shows another attachment mode of the operation rope 5, and one end side of the operation rope 5 is attached to the inside of the sudden descent stop device 6. The aspect shown in FIG. 13 is advantageous in the following points as compared with the aspect shown in FIG. By setting the fixing position of the operation rope 5 with respect to the sudden descent stop device 6 to the outside instead of the inside, the operation rope 5 is routed outside the device 6, and the operation rope 5 is entangled with the device 6 when the operation rope 5 is operated. The possibility of damage due to contact with the blade 91 is reduced. In addition, since the operation rope 5 is fixed to the outside of the device 6, the operation rope 5 does not touch the floor (it is not necessary to pass the operation rope 5 below the device 6 as in the embodiment of FIG. 14). , Dirt and deterioration of the operation rope 5 can be prevented.

A cover body 10 is further attached to the sudden descent stop device. As shown in FIG. 9, the cover body 10 includes a mounting portion 100 extending in the vertical direction, an upper surface portion 101 extending in the horizontal direction from the lower end of the mounting portion 100, and extending downwardly inclined from the upper surface portion 101. And a vertical portion 103 that hangs vertically from the lower end of the inclined portion 102. The attachment portion 100 of the cover body 10 is fixed to the bottom piece 70 of the base plate 7 via a screw, and the upper surface portion 101 and the inclined portion 102 are the side pieces 71 and 72 of the base plate 7, the bracket 80, the pivot 82, the spring 83, and the like. The upper side of the component is covered. The inclined portion 102 is formed wider than the upper surface portion 101, and the extending portion 102 a of the inclined portion 102 corresponds to the blade assembly 9. A bent portion 932 is formed at the upper end portion of the side cover 93 of the blade assembly 9, and the operation rope 5 enters by closing between the inclined portion 102 and the vertical portion 103 and the upper side of the blade assembly 9. Such a gap is prevented from being formed (see FIG. 13).

The sudden descent stop device further includes an operation rope guard 11. As shown in FIGS. 15 and 16, the operation rope guard 11 has a substantially L shape in sectional view from the mounting portion 110 and the side surface portion 111, and the side surface portion 111 faces the blade assembly 9 and the guide rail 2 a. The attachment portion 110 is fixed to the base portion 931 of the side cover 93 via a screw so as to cover from the side. The front end of the side surface portion 111 extends so as to be close to the guide rail mounting surface 20a to which the guide rail 2a is mounted (it only needs to be close enough to restrict the entry of the operation rope 5). Does not enter the inside of the side surface portion 111. That is, the operation rope 5 does not come into contact with the blade 91 located inside the side surface portion 111. The upper end side of the operation rope 5 is connected to a mounting plate 51 that protrudes from the guide rail 2a. The technical idea of providing the operation rope guard 11 in the sudden descent stop device can be established independently of the technical idea of providing the blade guard 92, and can be applied to a blade assembly that does not have the blade guard 92. It is. In addition, the technical idea of providing the operation rope guard 11 in the sudden descent stop device can be applied to the operation rope mounting structure of any aspect shown in FIGS. 13 and 14.

Further, FIG. 17 shows another embodiment of the blade guard. The basic configuration of the blade assembly 9 is the same as the blade assembly 9 described above, but the arrangement position and configuration of the blade guard 92A are different from the blade guard 92 of the blade assembly 9 described above. The blade guard 92A includes a main body portion 920A and a protruding portion 921A protruding from the main body portion 920A, and the protruding portion 921A is urged in a direction protruding from the main body portion 920A by an urging means such as a spring. At the normal time, the tip of the protrusion 921A protrudes by a predetermined dimension from the tip of the blade 91 (the right diagram in FIG. 17). The tip of the protruding portion 921A of the blade guard 92A extends along the tip of the blade 91, and prevents an object such as an operation rope or a finger from coming into contact with the tip of the blade 91 at normal times. The blade guard 92A is provided on the side of the blade 91 in the direction of rotation (upper side) by the urging means, and is separated from the blade 91 by a predetermined dimension. The left figure of FIG. 17 shows the state which the rotary body 8 rotated upward from the state of the right figure of FIG. The tip of the blade guard 92A comes into contact with the vertical portion 2a of the guide rail 2 before the tip of the blade 91. The projection 921A of the blade guard 92A is connected to the main body 920A at the tip of the projection 921A. It is configured to retract into the main body 920A when a pushing force is applied. The turning force of the blade assembly 9 by the urging means is set to be larger than the force of the urging means that causes the protruding portion 921A of the blade guard 92A to protrude from the main body portion 920A. It bites into and locks into the vertical portion 2a. The blade guard 92A having the protruding portion 921A that is retracted into the main body 920A is positioned on the opposite side (downward side) of the rotation direction of the blade assembly 9 like the blade guard 92 of the above-described embodiment. It is also good to set up.

INDUSTRIAL APPLICABILITY The present invention can be used for a sudden descent stop device for an overhead door.

It is a whole side view of an overhead door. It is the whole front view and bottom view of an overhead door. It is a top view of the sudden descent stop apparatus of a door body. FIG. 4 is a front view of the sudden descent stop device shown in FIG. 3. FIG. 4 is a side view of the sudden descent stop device shown in FIG. 3. It is a figure which shows a blade cover. It is a perspective view of the sudden descent stop device of a door body. It is a perspective view of the blade assembly which comprises the sudden descent stop apparatus. It is a disassembled perspective view explaining attachment of the sudden descent stop apparatus to the lowest panel of a door body. It is a top view which shows the sudden descent stop apparatus with which the lowermost panel of the door body was mounted | worn. It is an operation explanatory view of a blade guard concerning the present invention, (A) shows a blade assembly provided with a blade guard, and (B) shows a blade assembly which does not have a blade guard. It is action | operation explanatory drawing which shows the state which the blade assembly provided with the blade guard rotated. It is a figure which shows one aspect of attachment of an operation rope. It is a figure which shows one aspect of attachment of an operation rope. It is a disassembled perspective view which shows attachment of an operation rope guard. It is a figure which shows the top view of the descent | fall stop apparatus provided with the operation rope guard, and attachment on the housing side of an operation rope. Another embodiment of the blade guard is shown, the right figure shows a normal state, and the left figure shows a state where the rotating body is rotated and the blade of the blade assembly is locked to the guide rail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door body 1a Panel 2 Guide rail 2a Vertical part 4 Wire 5 Operation rope 6 Rapid descent stop device 7 Base plate 8 Rotating body 81 Arm 82 Axis 83 Spring 9 Blade assembly 91 Blade 92 Blade guard 93 Side cover 930 Side part 932 Bending part 10 Cover body 11 Operation rope guard

Claims (3)

A base member fixed to the door body;
A rotating body rotatably connected to the base member;
Blades with in accordance with the rotation of該回elements are connected to those該回body so as to rotate, the blades engaging cuts into the guide rail by the rotation of該回body, a blade guard, the Assembly,
Means for biasing the rotating body so as to rotate in a direction in which the blade is locked to the guide rail;
Have
The rotation of the rotating body by the biasing means is regulated by the tension of the wire that holds the door body connected to the rotating body, and the blade is rotated by rotating the rotating body by cutting the wire. The assembly is configured to pivot so that the blade engages the guide rail;
The blade guard is located on the opposite side of the blade from the rotating direction of the rotating body by the biasing means and protrudes from the tip of the blade, and is provided in the blade assembly. In a state where the rotation is restricted, the blade guard protrudes to the guide rail side from the tip of the blade, thereby restricting the object from contacting the blade. The portion is configured to be locked to the guide rail before the blade guard .
A sudden descent stop device for overhead doors. The apparatus of claim 1 , wherein the blade assembly includes a side cover that covers sides of the blade and the blade guard . The apparatus according to claim 2 , wherein the blade assembly is provided outside the rotating body, and one end side of an operation rope is fixed to an outer surface of the side cover.

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