JP4317233B2 - Architectural shutter sudden descent stop device - Google Patents

Description

  The present invention relates to a sudden descent stop device for a building shutter installed in an opening or a passage of a building.

  Conventionally, as a shutter for a building, a winding drum arranged along an upper edge of an opening of a building, a shutter curtain wound around the winding drum, and a drum shaft or the like at each end of the winding drum. A pair of left and right mounting brackets supported rotatably, and an opening / closing device attached to one of the mounting brackets, and by rotating the winding drum in the forward and reverse directions by the driving force of the opening / closing device, A device that automatically performs hoisting or lowering is known.

  In this type of architectural shutter, the take-up drum becomes free when the control device of the open / close device breaks down, or when the drive chain between the open / close device and the take-up drum is broken. There is a risk that the curtain will drop suddenly due to its own weight. Various sudden descent stop devices (also called fall prevention devices) for preventing this have been proposed and publicly known.

  As one of them, the sudden descent stop device disclosed in Patent Document 1 includes a rotating disk connected to a drum shaft, and a fixed body attached to a mounting bracket in a state in which the rotating disk is accommodated. A plurality of receiving grooves containing spherical or cylindrical rotating bodies are provided at the peripheral edge of the disk, and the upper part of the inner peripheral surface of the fixed body is subjected to centrifugal force during abnormal rotation of the winding drum due to a sudden drop of the shutter curtain. The rotating body that protrudes from the housing groove is fitted to approximately half of its diameter to provide a fitting groove for stopping the rotation of the rotating disk.

Further, a sudden descent stop device disclosed in Patent Document 2 includes a boss that is rotatably attached to the outer periphery of a drum shaft, a casing that surrounds the outer periphery of the boss, and one end of which is non-rotatably engaged with a mounting bracket. A brake member that is swingably supported by the boss and that exerts a braking force when the brake surface contacts the inner peripheral surface of the casing, and a direction in which the brake surface of the brake member is separated from the inner peripheral surface of the casing A speed increasing device composed of a multi-stage planetary gear mechanism that doubles and outputs the rotational speed of the drum shaft, and linkage means that links the output of the speed increasing device to the brake member. When the shutter curtain suddenly descends due to chain breakage or the like, the brake surface of the brake member is against the urging force of the spring member by the cooperation means. It is to stop or prevent the descent of the shutter curtain by contact with the circumferential surface to exert a braking force.
JP 2006-70628 A JP 2001-32655 A

  However, in the above-mentioned Patent Document 1, since only one rotating body is sandwiched between the rotating disk and the fixed main body to prevent the shutter curtain from descending rapidly, the rotating body or the like is easily damaged and operates. There is a problem of lack of reliability and durability. In order to solve this problem, it is conceivable to make the rotating body large and highly rigid. However, in that case, it is necessary to enlarge the rotating disk and the fixed body in the radial direction, and the entire apparatus is in the radial direction. There is a disadvantage of increasing the size.

  On the other hand, in the thing of the said patent document 2, since the cooperation means is the structure which rocks | fluctuates a brake member against the urging | biasing force of a spring member with a centrifugal force, separately from this cooperation means, a drum shaft A speed increasing device that doubles the rotation speed and outputs the power is essential. For this reason, there are problems that the number of parts increases, the cost increases, and parts management and assembly work become troublesome.

  The present invention has been made in view of such various points, and the problem is that the detection unit for detecting the sudden descent of the shutter curtain and the braking unit for exerting the braking force are separated from each other, and both are configured simply. This makes it possible to improve the reliability and durability of operation, reduce the size, reduce the number of parts, reduce costs, and facilitate the sudden drop and stop of building shutters that can facilitate parts management and assembly work. The device is intended to be provided.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a sudden descent of an architectural shutter provided between a drum shaft extending from one end of a winding drum of a shutter curtain and a mounting bracket that supports the drum shaft. As a stopping device, a boss that is rotatably attached to the outer periphery of the drum shaft, a casing that surrounds the outer periphery of the boss and is non-rotatably engaged with the mounting bracket, and a swingable support to the boss A brake member that exerts a braking force when the brake surface comes into contact with the inner peripheral surface of the casing, a spring member that biases the brake surface of the brake member in a direction away from the inner peripheral surface of the casing, The spring is mounted in a state in which relative rotational displacement is possible between a first position and a second position that differ by a predetermined angle with respect to the outer peripheral surface of the boss, and the spring is in the first position. The brake surface of the brake member is allowed to be separated from the inner peripheral surface of the casing by the biasing force of the material, and the brake surface of the brake member is against the biasing force of the spring member at the second position. An operating member to be brought into contact with the peripheral surface, an annular member which is mounted on the outer peripheral surface of the boss so as to be relatively rotatable, and a rotational force is transmitted from the operating member via a torque limiter, and the annular member and the casing, respectively There is provided an element, and when the winding drum is abnormally rotated due to a sudden drop of the shutter curtain, the element on the annular member side comes into contact with the element on the casing side by a centrifugal force to generate a resistance force during sudden drop. The torque limiter prevents a torque greater than a predetermined value from being transmitted to the annular member during abnormal rotation of the winding drum, and the operating member is moved to the first position by the rotational resistance generated by the sudden drop resistance generating means. To the second position.

  In this configuration, during normal rotation of the winding drum, the element on the annular member side of the sudden drop resistance generating means and the element on the casing do not come into contact with each other to generate a rotational resistance. Further, the brake member is positioned such that the brake surface is separated from the inner peripheral surface of the casing by the urging force of the spring member, and the operating member is positioned at a first position that allows the position state of the brake member.

  On the other hand, when the take-up drum rotates abnormally, that is, when the shutter curtain suddenly descends, the element on the annular member side of the resistance generator for the sudden drop comes into contact with the element on the casing side due to centrifugal force and generates rotational resistance. The operating member is rotationally displaced from the first position to the second position by the force. Along with this rotational displacement, the brake member swings against the urging force of the spring member, and the brake surface comes into contact with the inner peripheral surface of the casing to exert the braking force, thereby stopping the sudden descent of the shutter curtain. Or prevented. In addition, the torque limiter provided between the actuating member and the annular member does not transmit a rotational force of a predetermined value or more to the annular member side and thus to the sudden drop resistance force generation means side. These elements will not be damaged by a large load.

  The inventions according to claims 2 and 3 both provide a concrete form of the sudden drop resistance generating means in the sudden drop stopping device for building shutters according to claim 1.

  That is, in the invention according to claim 2, the sudden drop resistance generating means is provided at one end of the annular member as an element on the annular member side, and a rotating disk in which a plurality of receiving grooves are formed in the peripheral portion; A plurality of rotating bodies respectively housed in the respective housing grooves of the rotating disk, and as a casing-side element, having a disk surrounding member fixed to the casing and surrounding the peripheral edge of the rotating disk, The upper part of the inner surface of the disk surrounding member is formed with a fitting groove for fitting a rotating body that protrudes from the receiving groove of the rotating disk by centrifugal force when the take-up drum rotates abnormally only about half of its diameter. To do. In this configuration, when the take-up drum rotates abnormally, the rotating body housed in the housing groove of the rotating disk jumps out of the housing groove by centrifugal force, and approximately half the diameter of the rotating body is formed on the upper part of the inner surface of the disk surrounding member. By fitting in the fitted groove, the rotating body is sandwiched between the rotating disk and the disk surrounding member and generates a rotational resistance force.

  According to a third aspect of the present invention, the sudden drop resistance generating means is supported as an element on the annular member side so as to be swingable at an eccentric position on the rotating disk provided at one end of the annular member. And a lock arm provided with an engagement portion at one end, and a ring gear fixed to the casing and having inner teeth formed on the inner peripheral surface as an element on the casing side. The arm is positioned away from the inner teeth of the ring gear by the biasing force of the spring member during normal rotation of the winding drum, and resists the biasing force of the spring member by centrifugal force when the winding drum rotates abnormally. It swings and it is comprised so that an engaging part may engage with the internal tooth of a ring gear. In this configuration, when the take-up drum rotates abnormally, the lock arm supported by the rotating disk swings against the urging force of the spring member due to centrifugal force, and the engaging portion provided at one end of the lock arm has a ring gear. By engaging with the inner teeth, the engaging force is generated as a rotational resistance force.

  According to a fourth aspect of the present invention, in the architectural shutter sudden descent stop apparatus according to the second aspect, the rotating body is formed of a rigid sphere, and the surface of the fitting groove in the rotating direction of the rotating disk is substantially the same as the rotating body. It is formed on the concave spherical receiving surface of the diameter, and the surface opposite to the rotating direction of the rotating disk is formed as a guide surface for smoothly guiding the rotating body to the receiving surface, and the receiving surface is formed in the fitting groove. The projecting portion that restricts the rotation of the rotating body led to is extended from the receiving surface to be substantially parallel to the guide surface. In this configuration, when a rotating body made of a hard sphere that has jumped out of the receiving groove of the rotating disk at the time of abnormal rotation of the take-up drum is fitted into the fitting groove of the disk surrounding member, the rotating body uses the guide surface of the fitting groove. It passes smoothly through the receiving surface. Since the receiving surface is formed in a concave spherical shape having substantially the same diameter as that of the rotating body, the rotating body is securely received by the rotating disk and the disk surrounding member by closely receiving the rotating body in surface contact with the receiving surface. Can be pinched. In addition, since the rotating body guided to the receiving surface is restricted from dropping from the fitting groove by the protrusion formed in the fitting groove, the force that pinches the rotating body by the reaction when the shutter curtain suddenly stops moving down. Even if the rotor is loosened, the rotating body does not fall from the fitting groove, and the function of stopping the sudden descent of the shutter curtain is reliably exhibited.

  The invention according to claim 5 is the construction shutter rapid descent stop device according to claim 2 or 4, wherein the fitting groove is provided with a pair of symmetrical vertical lines passing through the center of the disk surrounding member. In this configuration, a sudden descent stop device is installed on either the left or right end of the take-up drum, so that even if the rotation direction of the rotating disk, etc. is reversed in the case of a sudden descent of the shutter curtain, the take-up drum rotates abnormally. Sometimes, the rotating body that has jumped out of the receiving groove of the rotating disk is fitted into the fitting groove on the rear side in the rotation direction of the disk surrounding member to generate a rotational resistance, and functions in the same manner.

  The invention according to claim 6 is the architectural shutter rapid descent stop device according to any one of claims 1 to 5, wherein a plurality of the brake members are arranged at equal intervals along the outer periphery of the boss, Each brake member is provided so as to be swingable around a support shaft penetrating the center portion, and each brake member and the above-described operation member are provided so as to be interlocked by pins. In this configuration, a plurality of brake members are swung by a single actuating member, and the brake surface of each brake member comes into contact with the inner peripheral surface of the casing to exert a braking force. It is possible to reliably prevent the curtain from dropping down.

  The invention according to claim 7 provides a preferable mode in the case of performing the control by detecting the stop operation in the sudden descent stop device for the architectural shutter according to claim 6. That is, each of the brake members is provided with a contact pin extending in a direction parallel to the support shaft, and a contact plate is fitted to the boss so as to be slidable in the axial direction corresponding to the contact pin. When the brake member swings around the support shaft in a direction in which the brake surface of each brake member contacts the inner peripheral surface of the casing during abnormal rotation, the contact plate pushes the contact plate along with the swing. Then, it is configured to slide on the boss in the axial direction, and includes a stop operation detecting means for detecting the sliding of the contact plate and outputting a signal. In this configuration, when each brake member swings around the support shaft in the direction in which the brake surface of each brake member contacts the inner peripheral surface of the casing during abnormal rotation of the winding drum, that is, the direction in which the braking force is exerted, As a result of the movement, the contact pin on each boss member pushes the contact plate on the boss and slides on the boss in the axial direction, and this stop is detected by the stop operation detecting means and outputs a signal. It is possible to accurately detect the stop operation time.

  As described above, according to the architectural shutter sudden descent stop device according to the present invention, when the shutter curtain suddenly descends, the element on the annular member side of the sudden drop resistance generating means rotates in contact with the casing side element by centrifugal force. A resistance force is generated, the operating plate is rotated and displaced by this rotational resistance force, the brake member swings against the biasing force of the spring member, and the brake surface comes into contact with the inner peripheral surface of the casing to generate the braking force. Because of this, the shutter curtain can be prevented from suddenly descending. Moreover, a torque limiter provided between the operating plate and the annular member does not transmit a rotational force of a predetermined value or more to the resistance generating means side at the time of sudden drop, so a large load is applied to the contact between the elements of the resistance generating means at the time of sudden drop. Accordingly, the elements do not break, and the reliability and durability of the operation can be improved, and the size can be reduced. Further, since the configuration is simple and the number of parts is small, the cost can be reduced, and the parts management and the assembly work can be facilitated.

  In particular, in the invention according to claim 2, in the sudden drop resistance force generating means, the rotating body accommodated in the accommodating groove of the rotating disk jumps out of the accommodating groove by centrifugal force, and approximately half of the diameter of the rotating body is the disk surrounding member. Since the rotating body is sandwiched between the rotating disk and the disk surrounding member by being fitted in the fitting groove formed on the upper portion of the inner surface, the device can be reduced in size. More can be achieved.

  In the invention according to claim 4, since the receiving surface of the fitting groove is formed in a concave spherical shape having substantially the same diameter as the rotating body, the rotating body is received in close contact with the receiving surface in a state of surface contact. Can be securely sandwiched between the rotating disk and the disk surrounding member. In addition, since the rotating body guided to the receiving surface is restricted from dropping from the fitting groove by the protrusion formed in the fitting groove, the force that pinches the rotating body by the reaction when the shutter curtain suddenly stops moving down. However, the rotating body does not fall out of the fitting groove even if it is loosened, so that the function of stopping the sudden descent of the shutter curtain can be surely exhibited, and the operation reliability can be further improved.

  In the invention according to claim 5, a sudden descent stop device is provided on either the left end or the right end of the take-up drum, so that even when the rotating direction of the rotating disk or the like when the shutter curtain suddenly descends is opposite, Similarly, when the drum rotates abnormally, the rotating body is sandwiched between the rotating disk and the disk surrounding member and generates rotational resistance. Play.

  In the invention according to claim 6, a plurality of brake members are swung by one operating member, and the brake surface of each brake member comes into contact with the inner peripheral surface of the casing to exert a braking force. It can be used to reliably prevent a sudden drop of the shutter curtain.

  Further, in the invention according to claim 7, when each brake member swings in a direction in which the braking force is exerted when the winding drum rotates abnormally, the contact pin provided on each brake member is moved along the swing by the contact pin provided on each brake member. Since the contact plate is pushed and slides in the axial direction, the stop operation detection means detects this slide and outputs a signal, so the stop operation can be accurately detected and controlled. There is also an effect that it can contribute to optimization.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show the overall construction of a building shutter equipped with a sudden descent stop device according to a first embodiment of the present invention, and 1 is a winding arranged along the upper edge of an opening or a passage of a building. It is a take-up drum, and drum shafts 2 and 3 extending from the inside to the outside along the center line are provided at both ends of the take-up drum 1, and the take-up drum 1 is wound through the drum shafts 2 and 3. Both ends of the drum 1 are rotatably supported by a pair of left and right mounting brackets 4L and 4R attached to the wall surface of the building.

  An upper end of a shutter curtain 5 for opening and closing a building opening and a passage is fixed to the winding drum 1. Further, in the right mounting bracket 4R in FIG. 1, a switch 6 made of a motor, a speed reducer or the like is mounted with its output shaft 6a facing the mounting bracket 4R, and the output shaft 6a of this switch 6 is provided. A drive chain 9 is wound around the sprocket 7 attached to the sprocket 8 and the sprocket 8 attached to the drum shaft 3 on the right side of the take-up drum 1. Then, the winding drum 1 is rotated in the forward and reverse directions by the driving force of the opening / closing device 6 so that the shutter curtain 5 is automatically wound up or down.

  Between the drum shaft 2 on the left side of the winding drum 1 and the mounting bracket 4L, a sudden descent stop device 10 for stopping or preventing the sudden descent of the shutter curtain 5 is provided. As shown in enlarged detail in FIGS. 3 to 7, the sudden descent stop device 10 includes a boss 11 that is rotatably attached to the outer periphery of the drum shaft 2 by key coupling, and a casing 12 that surrounds the outer periphery of the boss 11. It has. The boss 11 has an annular flange 11a that protrudes from the outer peripheral surface at an axially intermediate portion thereof. The casing 12 includes a bottomed cylindrical casing body 13 and a cover body 14 coupled to an opening of the casing body 13. The bottom 13a of the casing main body 13 is rotatably mounted on the outer peripheral surface of the boss 11 via a bearing 15, and the opening of the casing main body 13 is formed on the outer peripheral surface of the boss 11 with a bearing 16 and a sudden lowering described later. It is mounted so as to be relatively rotatable via a disk surrounding member 49 of the resistance generating means 34. Further, bolt insertion grooves 17 are formed at a plurality of locations on the peripheral portion of the bottom portion 13 a of the casing body 13, and one end of a bearing mounting bolt 18 (see FIG. 1) is inserted into the bolt insertion groove 17, whereby the casing 12. Is non-rotatably engaged with the mounting bracket 4L.

  .. Are disposed at equal intervals along the outer periphery of the boss 11 on one side surface (left side in FIG. 3) of the flange portion 11a of the boss 11. Each has a through-hole 22 having a long hole shape in which two perfect circles are continuous at the center, and can swing around a support shaft 23 that passes through the through-hole 22 and is fixed to the flange 11a of the boss 11. It is supported. Further, each brake member 21 is formed of a sintered cork on a portion of the outer surface facing the inner peripheral surface of the casing 12 that is in front of the through-hole 22 in the rotational direction R of the winding drum 1 when the shutter curtain 5 is lowered. The brake surface 24 comes into contact with the inner peripheral surface of the casing 12 and exerts a braking force.

  As shown in FIG. 8, each brake member 11 is formed with a notch groove 25 having a U-shaped cross section facing the through hole 22, and the brake surface 24 of the brake member 21 is formed in the notch groove 25 in the casing 12. A coil spring 26 serving as a spring member that is constantly urged in a direction away from the inner peripheral surface is disposed in a compressed state with respect to the support shaft 23. In addition, an insertion groove 27 extending in a direction parallel to the support shaft 23 is formed in the central portion of the outer surface of each brake member 21, and on the surface opposite to the boss flange 11 a of each brake member 21, Similarly, a contact pin 28 extending in a direction parallel to the support shaft 23 is provided so as to protrude. A restraining plate 29 fixed to the flange portion 11a of the boss 11 via the support shaft 23 is disposed on the side of each brake member 11 opposite to the boss flange portion 11a. The lateral displacement of is restricted.

  The sudden descent stop device 10 is further provided with an annular member 32 mounted on the outer peripheral surface on the right side of the flange 11a of the boss 11 via a bearing 31 so as to be relatively rotatable, and at one end of the annular member 32. A ring-shaped actuating plate 33 as an actuating member and a sudden drop resistance force generating means 34 provided on the other end side of the annular member 32 are provided. In the operation plate 33, five parallel pins 35, 35,... Respectively inserted into the insertion grooves 27 of the respective brake members 21 are implanted at equal intervals in the circumferential direction. The operating plate 33 is attached to the outer peripheral surface of the boss 11 in a state in which relative rotation displacement is possible between a first position and a second position that are different from each other by a predetermined angle in the circumferential direction with the annular member 32 interposed therebetween. 4, the brake surface 24 of each brake member 21 is allowed to be spaced apart from the inner peripheral surface of the casing 12 by the biasing force of each coil spring 26 as shown in FIG. As shown in FIG. 4, the brake surface 24 of each brake member 21 is brought into contact with the inner peripheral surface of the casing 12 against the urging force of each coil spring 26. As shown in FIG. 6, the operating plate 33 is formed by a biasing force of a balance spring 38 spanned between a spring post 36 planted on the flange 11 a of the boss 11 and a spring post 37 planted on the operating plate 33. It can be positioned at one position. Here, as shown in FIGS. 4 and 5, the contour of the restraining plate 29 interferes with the contact pin 28 of each brake member 11 when the operation plate 33 is located at either the first position or the second position. It is formed so as not to.

  The operating plate 33 is fitted to the outer peripheral surface of the annular member 32 so as to be rotatable relative to the outer peripheral surface. On the other hand, the rotational force from the operating plate 33 to the annular member 32 is transmitted via the torque limiter 40. It is like that. The torque limiter 40 is of a clutch type, and is formed in an arc shape along the outer peripheral surface of the annular member 32 as shown in FIG. 6, and one end thereof is swingably supported via a clutch pin 41. A pair of clutch plates 42, 42, clutch linings 43, 43 fixed to the inner edge of each clutch plate 42 and in contact with the outer peripheral surface of the annular member 32, and a pair of clutch linings 43, 43 interposed therebetween A clutch spring 44 that is stretched between the other ends of the clutch plates 42 and 42 so as to sandwich the annular member 32 between the clutch plates 42 and 42, and when the rotational force exceeding a predetermined value is applied, Slip between them.

  The sudden drop resistance generating means 34 generates a rotational resistance when the element on the annular member 32 side contacts the element on the casing 12 side by centrifugal force when the winding drum 1 rotates abnormally due to the sudden drop of the shutter curtain 5. In the case of this embodiment, as an element on the annular member 32 side, a rotary disk 47 provided at one end of the annular member 32 and having a plurality of receiving grooves 46, 46,. Has a plurality of rotating bodies 48, 48,... Respectively housed in the housing grooves 46 of the rotating disk 47, and is fixed to the casing 12 as an element on the casing 12 side, and surrounds the peripheral edge of the rotating disk 47. A disk surrounding member 49 is provided.

  As shown in FIG. 9, the rotating disk 47 is a sprocket-like member formed integrally with the annular member 32 with the annular member 32 as a boss portion. Each receiving groove 46 of the rotating disk 47 has a valley of the sprocket. Like the part, it is formed at predetermined intervals in the circumferential direction. Each of the rotating bodies 48 is made of a hard sphere, and its diameter is set slightly smaller than the depth dimension of the receiving groove 46.

  The disk surrounding member 49 is fixed to the surrounding body 49a by screws with an surrounding body 49a covering the outer side of the receiving groove 46 at the periphery of the rotating disk 47 and one side (right side in FIG. 3). 47 includes an enclosure cover 49b that covers the other side (left side in FIG. 3) of the accommodation groove 46 at the peripheral edge. As shown in FIGS. 10 and 11, a bearing housing portion 51 for housing the bearing 16 is formed on the inner peripheral surface of the go body 49 a on the side surface in contact with the cover body 14 of the casing 12. A disk accommodating portion 52 that accommodates the peripheral edge of the rotating disk 47 is formed on the side surface in contact with 49b. A pair of fittings that fit approximately half of the outer diameter of the rotating body 48 that jumps out of the receiving groove 46 of the rotating disk 47 by centrifugal force when the winding drum 1 rotates abnormally on the upper part of the inner surface of the disk receiving part 52. The mating grooves 53 and 54 are provided symmetrically with a vertical line V passing through the center of the surrounding body 49a or the disk surrounding member 49, and the surface of each of the fitting grooves 53 and 54 near the vertical line V is a rotating body. 48 are formed on concave spherical receiving surfaces 53a, 54a having substantially the same diameter as 48, and the surfaces of the fitting grooves 53, 54 on the side away from the vertical axis V are the receiving surfaces 53a, 54a of the rotating body 48. Are formed on guide surfaces 53 b and 54 b for smoothly guiding them to the lower portion of the disk storage portion 52.

  On the lower side portion of the disc housing portion 52 and the thickness side surfaces of the fitting grooves 53 and 54, a rolling surface 55 having a concave cross section having substantially the same diameter as the rotating body 48 extending along the boundary with the outer peripheral surface. And a rotating body 48 that rolls on the rolling surface 55 during normal rotation of the take-up drum 1 is easily received in the receiving groove 46 of the rotating disc 47. For this purpose, a low step surface 56 having the same depth as the deepest portion of the rolling surface 55 is formed. Further, the upper portion of the disc accommodating portion 52 has a cross-sectional concave surface having substantially the same diameter as that of the rotating body 48 extending between the pair of fitting grooves 53 and 54 and in the vicinity of the receiving surfaces 53a and 54a of the fitting grooves 53 and 54. A corner surface 57 is formed so as to be continuous with the lower step surface 56, and in the vicinity of the receiving surfaces 53a and 54a of the respective fitting grooves 53 and 54, as shown in an enlarged detail in FIG. 55 and the corner surface 57 form projections 58 and 58 for restricting the rotating body 48 guided to the receiving surfaces 53a and 54a from dropping to the storage groove 46 side of the rotating disk 47. The portion 58 extends substantially parallel to the guide surfaces 53b and 54b from the receiving surfaces 53a and 54a.

  Further, as shown in enlarged detail in FIG. 13, the sudden descent stop device 10 is fitted to the outer peripheral surface of the boss 11 so as to be slidable in the axial direction corresponding to the contact pin 28 of each brake member 21. A contact plate 61 and stop operation detecting means 62 that detects sliding of the contact plate 61 and outputs a signal are provided. As shown in FIG. 14, the contact plate 61 includes an inner ring portion 61a having a fitting hole 63 that fits into the boss 11, a ring-shaped inclined portion 61b that is inclined in the radial direction from the outer peripheral edge of the inner ring portion 61a, The outer ring portion 61c is continuous with the outer peripheral edge of the inclined portion 61b. Normally, as shown by a solid line in FIG. 13, the contact pin 28 of each brake member 21 is positioned in a state where it is in contact with or close to the outer ring portion 61 c of the contact plate 61, and each brake member is rotated when the winding drum 1 rotates abnormally. When each brake member 21 swings around the support shaft 23 in the direction in which the brake surface 24 of 21 is in contact with the inner peripheral surface of the casing 12, as shown by the phantom line in FIG. When 28 contacts the inclined portion 61 b of the contact plate 61, the contact plate 61 is pushed and slides on the boss 11 toward the axial stop operation detecting means 62.

  In the case of the present embodiment, the stop operation detection means 62 is formed of a contact type switch such as a micro switch, and has a rotating roller 64 as a contact that can contact the contact plate 61. Although the output signal of the stop operation detecting means 62 is not shown, it is transmitted to a building shutter control device or the like, and control such as stopping the operation of the switch 6 in accordance with the stop operation of the sudden descent stop device 10 is performed. Done. 3 and 13, reference numeral 66 denotes a coil spring mounted on the outer peripheral surface of the boss 11 in order to urge the contact plate 61 in a direction away from the rotating roller 64 of the stop operation detecting means 62.

  Next, the operation of the first embodiment, particularly the operation of the sudden descent stop device 10, will be described. During normal rotation of the winding drum 1 (that is, when the shutter curtain 5 is wound or lowered) In the resistance generating means 34, the rotating body 48 housed in each housing groove 46 of the rotating disk 47 is rotated by the disk housing portion 52 of the disk surrounding member 49 as the rotating disk 47 rotates as shown by the solid line in FIG. The lower portion rotates while contacting the inner peripheral surface, and the upper portion of the disk storage portion 52 rotates away from the inner peripheral surface, so that no rotational resistance force is generated. Each brake member 21 rotates integrally with the boss 11 while the brake surface 24 is held away from the inner peripheral surface of the casing 12 by the urging force of the coil spring 26 as shown in FIG. The plate 33 is located at a first position that allows the position of the brake member 21.

  On the other hand, when the take-up drum 1 rotates abnormally due to a sudden drop of the shutter curtain 5, the rotating body 48 of the sudden drop resistance generating means 34 has a receiving groove of the rotary disk 47 due to centrifugal force, as indicated by a virtual line in FIG. Since it protrudes about halfway from 46 and fits into a fitting groove 53 formed in the upper part of the disk housing portion 52 of the disk surrounding member 49, it is sandwiched between the rotating disk 47 and the disk surrounding member 49 (the surrounding body 49a). Rotational resistance is generated. At this time, the working plate 33 is delayed from the first position to the second position opposite to the rotational direction R of the boss 11 due to a delay with respect to the rotation of the winding drum 1 or the boss 11, and this rotational displacement is caused. Accordingly, each brake member 21 swings against the urging force of the coil spring 26, and the brake surface 24 comes into contact with the inner peripheral surface of the casing 12 to exert a braking force as shown in FIG. For this reason, the sudden descent of the shutter curtain 5 can be stopped or prevented, and safety can be ensured.

  In addition, the torque limiter 40 provided between the operating plate 33 and the annular member 32 does not transmit a rotational force of a predetermined value or more to the annular member 32 side and hence to the sudden drop resistance force generating means 34 side. A large load is not applied to the rotating body 48 of the means 34 between the rotating disk 47 and the disk surrounding member 47 so that the rotating body 48 is not damaged or damaged, and the reliability and durability of the operation are improved. While being able to raise, size reduction can be achieved. Further, since the configuration is simple and the number of parts is small, the cost can be reduced, and the parts management and the assembly work can be facilitated.

  In particular, in the case of the present embodiment, when the rotating body 48 that has jumped out of the receiving groove 46 of the rotating disk 47 during the abnormal rotation of the winding drum 1 is fitted into the fitting groove 53 of the disk containing portion 52 of the disk surrounding member 49, The rotating body 48 is formed of a hard sphere that is easy to rotate, and is smoothly guided to the receiving surface 53 a through the guide surface 53 b of the fitting groove 53. The receiving surface 53 a of the fitting groove 53 is substantially the same as the rotating body 48. Since it is formed in a concave spherical shape with the same diameter, the rotating body 48 can be received tightly in a state of surface contact with the receiving surface 53 a and the rotating body 48 can be securely sandwiched between the rotating disk 47 and the disk surrounding member 49. it can. In addition, since the rotating body 48 guided to the receiving surface 53a is restricted from dropping from the fitting groove 53 by the protrusion 58 formed in the fitting groove 53, it is caused by the recoil when the shutter curtain 5 suddenly descends. Even if the force sandwiching the rotating body 48 is loosened, the rotating body 48 does not fall from the fitting groove 53, and the function of stopping the sudden descent of the shutter curtain 5 can be surely exhibited, and the operation reliability can be further improved. it can.

  Further, not only a fitting groove 53 is provided on the upper side of the disk housing portion 52 of the disk surrounding member 49 on the rear side in the rotation direction R of the rotating disk 47 or the like when the shutter curtain 5 suddenly descends. Since the fitting groove 54 is also provided symmetrically with the vertical line V passing through the center of the disk surrounding member 49 on the R front side, the left and right sides of the architectural shutter as shown in FIG. Even if the rotation direction R of the rotating disk 47 or the like when the shutter curtain 5 suddenly descends is reversed, the rotating body 48 that has jumped out of the receiving groove 46 of the rotating disk 47 when the winding drum 1 rotates abnormally rotates the disk surrounding member. It will be fitted in the fitting groove 54 on the rear side in the direction to generate a rotational resistance force, and functions in the same manner. For this reason, one kind of sudden descent stop device 10 can be used also, and there exists an effect excellent in practicality.

  Further, the five brake members 21, 21,... Are swung by one operating plate 33, and the brake surface 24 of each brake member 21 comes into contact with the inner peripheral surface of the casing 12 to exert a braking force. The braking force can be exerted to prevent the shutter curtain 5 from dropping rapidly.

  In addition, when the winding drum 1 rotates abnormally, each brake member 21 swings around the support shaft 23 in the direction in which the brake surface 24 of each brake member 21 comes into contact with the inner peripheral surface of the casing 12, that is, in the direction in which the braking force is exerted. When moving, the contact plate 28 on the boss 11 is pushed by the contact pin 28 provided on each brake member 21 along with the swing, and slides on the boss 11 in the axial direction. Since the means 62 detects and outputs a signal, the stop operation time can be accurately detected, which can contribute to optimization of control.

  FIG. 15 shows a modification of the sudden descent resistance generating means which is a component of the sudden descent stop device as the second embodiment of the present invention. That is, in the case of this modified example, the sudden drop resistance force generating means 70 includes, as an element on the annular member side, a rotating disk 72 that is integrally attached to one end of the annular member 71, and the rotating disk 72 on one side from the center of gravity. And a lock arm 74 that is swingably supported around the support shaft 73 at an eccentric position and is provided with an engaging portion 74a at the tip on the opposite eccentric side, and is fixed to the casing as an element on the casing side. A ring gear 75 is provided.

  On the inner peripheral surface of the ring gear 75, a plurality of internal teeth 76, 76,... That can be engaged with the engaging portion 74a of the lock arm 74 are formed at predetermined intervals. During normal rotation of the winding drum 1 (see FIG. 1), the lock arm 74 has an engaging portion 74a whose inner teeth 76 of the ring gear 75 are energized by a biasing force of a coil spring 77 as a spring member as shown by a solid line in FIG. When the take-up drum 1 rotates abnormally due to a sudden drop of the shutter curtain, the lock arm 74 swings against the urging force of the coil spring 77 by centrifugal force, as shown by the phantom line in FIG. The engaging portion 74 a is adapted to engage with the inner teeth 76 of the ring gear 75.

  In addition, this invention is not limited to the said 1st and 2nd embodiment, Other various forms are included. For example, in the first embodiment, in order to use one kind of sudden descent stop device for both when the architectural shutter is installed opposite to the left and right, the disk enclosure is provided on the upper side of the disk housing portion 52 of the disk surrounding member 49. The pair of fitting grooves 53 and 54 are provided symmetrically with respect to the vertical line V passing through the center of the member 49. However, when the sudden descent stop device is used only on one side, the rotation disc of the rotating disk or the like after the shutter curtain suddenly descends is provided. Of course, the fitting groove may be provided only on the side.

  In the first embodiment, when the brake member 21 is swingably provided on the flange portion 11 a of the boss 11, the through hole 22 is provided in the central portion of the brake member 21, and the support shaft that passes through the through hole 22 is provided. Although the brake member 21 is configured to swing around 23, the present invention is not limited to this configuration, and the brake member 21 may be swingably provided with one end side of the brake member 21 as a support shaft side. Further, the number of brake members 21 is not limited to five as in the first embodiment, and may be one or a plurality other than five.

It is the front view which cut in part which shows the whole structure of the architectural shutter which concerns on the 1st Embodiment of this invention. It is sectional drawing in the XX line of FIG. It is a longitudinal cross-sectional view of the sudden descent stop apparatus with which the said architectural shutter is equipped. It is sectional drawing in the YY line of FIG. FIG. 5 is a view corresponding to FIG. 4 when the winding drum rotates abnormally. It is sectional drawing in the ZZ line of FIG. It is sectional drawing in the DD line | wire of FIG. It is an expansion perspective view of a brake member. (A) is a front view of an annular member and a rotating disk integrally formed therewith, and (b) is a longitudinal sectional view of the same. (A) is a front view of the surrounding body of a disk surrounding member, (b) is the longitudinal cross-sectional view. It is sectional drawing in the EE line | wire of Fig.10 (a). It is an enlarged view of F vicinity of FIG. FIG. 4 is an operation explanatory diagram in which the vicinity of the stop operation detecting means in FIG. (A) is a longitudinal cross-sectional view of a contact plate, (b) is a front view of the right half. It is a block diagram of the resistance generating means at the time of sudden descent of the sudden descent stop device concerning a 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding drum 2, 3 Drum shaft 4L, 4R Mounting bracket 5 Shutter curtain 10 Rapid descent stop device 11 Boss 12 Casing 21 Brake member 23 Support shaft 24 Brake surface 26 Coil spring (spring member)
28 Contact pin 32, 71 Annular member 33 Actuating plate (actuating member)
34, 70 Sudden descent resistance generating means 35 Parallel pin 40 Torque limiter 46 Housing groove 47, 72 Rotating disk 48 Rotating body 49 Disk surrounding member 53, 54 Fitting groove 53a, 54a Receiving surface 53b, 54b Guide surface 58 Protruding part 61 Contact plate 62 Stop operation detecting means 74 Lock arm 74a Engaging portion 75 Ring gear 76 Internal tooth 77 Coil spring (spring member)

Claims (7)

A sudden descent stop device for a building shutter provided between a drum shaft extending from one end of a winding drum of a shutter curtain and a mounting bracket that supports the drum shaft,
A boss that is rotatably integrated around the outer periphery of the drum shaft;
A casing surrounding the outer periphery of the boss and non-rotatably engaged with the mounting bracket;
A brake member that is swingably supported by the boss and that exerts a braking force by contacting a brake surface with an inner peripheral surface of the casing;
A spring member that urges the brake surface of the brake member in a direction away from the inner peripheral surface of the casing;
The boss is mounted in a state that allows relative rotational displacement between a first position and a second position that are different from each other by a predetermined angle with respect to the outer peripheral surface of the boss, and the brake surface of the brake member is casing by the urging force of the spring member at the first position. An actuating member for allowing the brake surface of the brake member to come into contact with the inner peripheral surface of the casing against the biasing force of the spring member in the second position.
An annular member that is mounted on the outer peripheral surface of the boss so as to be relatively rotatable, and a rotational force is transmitted from the operating member via a torque limiter;
The annular member and the casing are provided with respective elements, and when the take-up drum rotates abnormally due to a sudden drop of the shutter curtain, the annular member side element comes into contact with the casing side element by centrifugal force to generate a rotational resistance force. And a resistance force generating means,
When the winding drum rotates abnormally, the torque limiter prevents a torque greater than a predetermined value from being transmitted to the annular member, and the operating member is moved from the first position by the rotational resistance generated by the resistance generating means at the time of sudden drop. A rapid descent stop device for an architectural shutter, characterized in that it is configured to be rotationally displaced in two positions.   The sudden drop resistance generating means is provided as an element on the annular member side at one end of the annular member, and is accommodated in each of the accommodating grooves of the rotating disk having a plurality of accommodating grooves formed on the peripheral edge thereof. And a disk surrounding member that is fixed to the casing and surrounds the peripheral edge of the rotating disk, and is provided on an upper portion of the inner surface of the disk surrounding member. 2. A sudden descent stop device for a building shutter according to claim 1, wherein a fitting groove is formed for fitting a rotating body that protrudes from the receiving groove of the rotating disk by centrifugal force when the take-up drum rotates abnormally by approximately half of its diameter. .   The sudden drop resistance generating means includes, as an element on the annular member side, a rotating disk provided at one end of the annular member, and is supported on the rotating disk so as to be swingable in an eccentric position, and an engaging portion is provided at one end. And a ring gear that is fixed to the casing and has inner teeth formed on the inner peripheral surface thereof, and the lock arm is used during normal rotation of the take-up drum. The engaging part is positioned away from the inner teeth of the ring gear by the biasing force of the spring member, and when the winding drum rotates abnormally, the engaging part swings against the biasing force of the spring member by the centrifugal force and the engaging part is The rapid descent stop device for a building shutter according to claim 1, wherein the device is configured to engage with an internal tooth.   The rotating body is formed of a rigid sphere, and the surface in the rotation direction of the rotating disk in the fitting groove is formed on a concave spherical receiving surface having substantially the same diameter as the rotating body, and is opposite to the rotating direction of the rotating disk. The surface is formed as a guide surface for smoothly guiding the rotating body to the receiving surface, and the fitting groove has a protrusion that restricts the rotating body guided to the receiving surface from falling. The rapid descent stop device for an architectural shutter according to claim 2, wherein the device is formed so as to extend substantially parallel to the guide surface.   The sudden drop stop device for a building shutter according to claim 2 or 4, wherein the fitting groove is provided with a pair of symmetrical vertical lines passing through the center of the disk surrounding member.   A plurality of the brake members are arranged at equal intervals along the outer periphery of the boss, and each brake member is provided so as to be able to swing around a support shaft that penetrates the central portion. The rapid descent stop device for a building shutter according to any one of claims 1 to 5, wherein the operating member is provided so as to be interlocked by a pin. Each brake member is provided with a contact pin extending in a direction parallel to the support shaft, and a contact plate is fitted to the boss so as to be slidable in the axial direction corresponding to the contact pin. When each brake member swings around the support shaft in a direction in which the brake surface of each brake member contacts the inner peripheral surface of the casing when the drum rotates abnormally, the contact pin causes the contact plate to be moved by the contact pin. 7. The rapid lowering of the architectural shutter according to claim 6, further comprising a stop operation detecting means which is pushed and slides in the axial direction on the boss, and detects a sliding of the contact plate and outputs a signal. Stop device.