JP4896951B2 - Architectural shutter and its sudden descent stop device - Google Patents

Description

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

  Conventionally, as an architectural shutter, for example, as disclosed in Patent Document 1, a winding drum disposed along an upper edge of an opening of a building, a shutter curtain wound around the winding drum, A pair of left and right mounting brackets that rotatably support both ends of the take-up drum via support shafts and bearings, an opening / closing machine as a drive unit attached to one mounting bracket, and an output shaft of the opening / closing machine And a drive chain wound between a drive sprocket attached to the spindle of the take-up drum and a take-up drum in the forward and reverse directions by the driving force of the opening / closing machine. It is known that a shutter curtain is automatically wound up or down by rotating it.

  In this type of architectural shutter, the take-up drum becomes free when the control device or brake device of the switch breaks down or when the drive chain is broken, and the shutter curtain is moved by its own weight. There is a risk of a sudden drop. Various sudden descent stop devices (also referred to as fall prevention devices) for preventing this have been proposed and publicly known.

  As one of them, the sudden descent stop device disclosed in the above-mentioned Patent Document 1 is the end of a support shaft that is penetrated and supported by a mounting bracket on the opposite side of the switch mounting side among the support shafts at both ends of the winding drum. The rotating disk is attached to the unit and is connected to the support shaft in a rotationally integrated manner, and a fixed body fixed to the mounting bracket in a state in which the rotating disk is accommodated. A plurality of receiving grooves for receiving a spherical or cylindrical rotating body are formed at the peripheral edge of the rotating disk, and the upper part of the inner peripheral surface of the fixed body is in an abnormal rotation of the winding drum due to a sudden drop of the shutter curtain. A rotating groove that protrudes from the receiving groove by centrifugal force is fitted to approximately half of its diameter to form a fitting groove for stopping the rotation of the rotating disk.

Further, the sudden descent stop device disclosed in Patent Document 2 is attached to a mounting bracket on a switch mounting side among a pair of left and right mounting brackets of a winding drum, and a drive sprocket and a winding drum on the switch side. A detecting unit that makes contact with the driven sprocket on the side from the inner side to the outer side of the driving chain in an elastic state and changes its posture in response to detecting slack in the chain, and the posture of this detecting unit And a regulating portion made of an arm member whose one end engages with the driven sprocket based on the change of the winding and regulates the rotation of the take-up drum.
JP 2006-70628 A JP 2007-332601 A

  However, in the above-mentioned Patent Document 1, since it is necessary to secure an arrangement space for the steep descent stop device and a space for maintenance on the outside side of the mounting bracket on the side opposite to the switch mounting side, the steep descent stop device is provided. There is a problem that the applicable range of the architectural shutter that can be equipped with is reduced accordingly. In addition, for existing building shutters, in addition to the above-mentioned space problem, an extra part for attaching a sudden descent stop device is required at the end of the support shaft that penetrates the mounting bracket. There is also the problem that the device cannot be retrofitted.

  On the other hand, in the above-mentioned Patent Document 2, when the shutter curtain suddenly descends due to the cutting of the drive chain, the rotation of the take-up drum is restricted and the shutter curtain suddenly descends. There is a problem that the stop function cannot be exhibited when the shutter curtain suddenly descends due to a failure of the brake device of the machine.

  The present invention has been made in view of the above points, and the object of the present invention is, in particular, by drastically improving a sudden descent stop device for mounting on a mounting bracket on a switch mounting side. In addition to cutting, it is possible to improve safety by always exhibiting a stop function during abnormal rotation of the take-up drum, and it can be easily installed on an existing architectural shutter and attached to a switch It is an object of the present invention to provide an architectural shutter having a wide range of application that does not require a space on the outer side of the mounting bracket on the side opposite to the side and its sudden descent stop device.

  In order to solve the above-mentioned problems, the invention according to claim 1 is the construction shutter, wherein both ends of the winding drum of the shutter curtain are rotatably supported by the pair of left and right mounting brackets via the support shafts, respectively. The switch is attached to one mounting bracket, and the chain is wound between the drive sprocket mounted on the output shaft of the switch and the driven sprocket mounted on the support shaft of the take-up drum. Assumption. Then, a sudden descent stop device is attached to a position of the one mounting bracket surrounded by the drive sprocket, driven sprocket and chain and facing the driven sprocket, and the sudden descent stop device is fixed to the mounting bracket. A timing wheel that is rotatably supported in the casing and meshes with the driven sprocket through an opening provided in the casing, and is arranged in the casing so as to rotate integrally with the timing wheel and at a peripheral portion. A lock wheel formed with a plurality of receiving grooves and a plurality of rotating bodies respectively housed in the receiving grooves of the lock wheel, and when the winding drum rotates abnormally due to a sudden drop of the shutter curtain, Fitting formed on the inner peripheral surface of the casing by a rotating body that jumps out of the receiving groove Configure by being sandwiched between the end portion to exert a stop function.

  With this configuration, when the take-up drum rotates abnormally due to a sudden drop of the shutter curtain, the mounting bracket on the switch mounting side is attached to the area surrounded by the drive sprocket, driven sprocket, and chain and at a position facing the drive sprocket. In the steep descent stop device, the timing wheel and the lock wheel meshing with the driven sprocket on the take-up drum side rotate at high speed according to the rotation speed of the driven sprocket, and the rotating body housed in the housing groove of this lock wheel is housed by centrifugal force. The stop function is exhibited by protruding from the groove to the fitting groove on the inner peripheral surface side of the casing and being sandwiched by the end portion of the fitting groove, and the shutter curtain is prevented from suddenly descending.

  The above-mentioned sudden descent stop device is installed at a position facing the drive sprocket in the region surrounded by the drive sprocket, driven sprocket and chain of the mounting bracket on the switch mounting side, and is equipped with this sudden descent stop device No space is required on the outside side of the mounting bracket. Moreover, it can be easily attached to an existing architectural shutter by retrofitting, and has a wide application range.

  According to a second aspect of the present invention, in the architectural shutter according to the first aspect, a lock case formed with the fitting groove on the inner peripheral surface in the casing can be relatively rotated around the axis of the lock wheel. And an elastic body for restricting the relative rotational displacement between the lock case and the casing. In this configuration, when the rotating body is sandwiched between the lock wheel and the lock wheel at the terminal end of the lock case and exhibits a stop function, the elastic body is elastically deformed to absorb the impact force, Damage to the rotating body and the lock wheel is prevented.

According to a third aspect of the present invention, in the architectural shutter according to the first or second aspect , a convex portion sandwiched between two upper and lower step portions extending parallel to each other in the horizontal direction is formed on the mounting surface side of the casing. The casing is attached to the mounting bracket by bolting in a state where the convex portion is fitted into a notch provided in the mounting bracket. In this configuration, the casing is attached to the mounting bracket by bolting with the convex part on the casing mounting surface side fitted into the notch of the mounting bracket, so that it can sufficiently withstand the impact force when the stop function is exhibited. The obtained mounting strength can be ensured.

  According to a fourth aspect of the present invention, an area of the mounting bracket on the switch mounting side that rotatably supports one end of the winding drum is sandwiched between the drive sprocket on the switch side, the driven sprocket on the winding drum side, and the chain. As a sudden descent stop device for a building shutter that is mounted at a position opposite to the driven sprocket, the casing is fixed to the mounting bracket, and is rotatably supported in the casing and through the opening provided in the casing. A timing wheel that meshes with the sprocket, a lock wheel that is arranged in the casing so as to rotate integrally with the timing wheel, and in which a plurality of receiving grooves are formed at the peripheral edge, and is housed in each receiving groove of the lock wheel, respectively. And a take-up drum by a sudden drop of the shutter curtain. Rotator jumping out from the accommodation groove of the lock wheel in the abnormal rotation is configured to exert a stopping function by being sandwiched between the end portion of the fitting groove formed in the inner peripheral surface of the casing.

  With this configuration, when the take-up drum rotates abnormally due to a sudden drop of the shutter curtain, the timing wheel and the lock wheel that engage with the driven sprocket on the take-up drum side rotate at high speed according to the rotation speed of the driven sprocket, and the lock vehicle is accommodated. When the rotating body housed in the groove protrudes from the housing groove into the fitting groove on the inner peripheral surface side of the casing by centrifugal force and is sandwiched between the terminal ends of the fitting groove, the shutter curtain suddenly descends. Is prevented.

  As described above, according to the architectural shutter and the sudden descent stop device of the present invention, when the take-up drum rotates abnormally due to the sudden descent of the shutter curtain, not only the drive chain is cut, but the lock descent of the sudden descent stop device is always provided. Since the rotating body housed in the housing groove protrudes from the housing groove to the fitting groove on the inner peripheral surface side of the casing by centrifugal force and is pinched at the end of the fitting groove, the shutter curtain suddenly descends. It can be surely prevented and safety can be improved. In addition, since it is equipped with a steep descent stop device, it does not require space on the outside side of the mounting bracket, and can be easily mounted on an existing architectural shutter by retrofitting, so it is widely applicable and practical. It has an excellent effect.

  In particular, in the invention according to claim 2, when the rotating body is sandwiched between the lock wheel and the lock wheel at the end portion of the fitting groove of the lock case to exert a stop function, the elasticity interposed between the lock case and the casing. Since the body elastically deforms and absorbs the impact force, it is possible to prevent damage to the rotating body and the lock car, etc., and to prevent this damage, the size of the parts increases with the strength of the parts, and thus the sudden descent stop device itself becomes large. It is possible to suppress downsizing and contribute to downsizing.

  Further, in the invention according to claim 3, since the casing is attached to the mounting bracket by bolting in a state where the convex portion on the casing mounting surface side is fitted into the notch portion of the mounting bracket, the impact when the stop function is exhibited. The mounting strength that can sufficiently withstand the force can be secured, which is effective for implementation.

  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 according to an embodiment of the present invention. Reference numeral 1 denotes a winding drum arranged along an upper edge such as an opening of a building. Both ends of 1 are rotatably supported by a pair of left and right mounting brackets 2L, 2R attached to the wall surface via support shafts 3, 4 and bearings 5 respectively.

  Of the pair of left and right mounting brackets 2L, 2R, the left mounting bracket 2L has a horizontally long rectangular shape as shown in FIG. 3, and a flange 6 provided at the rear edge is bolted to the wall surface. It is attached with 7 stops. In the left mounting bracket 2L, the support shaft 3 of the winding drum 1 and the like are penetrated and supported on the rear side, and an opening / closing machine 8 is mounted on the front side.

  As shown in detail in FIG. 4, the opening / closing machine 8 is configured by sequentially connecting a speed reduction unit 11, a motor 12, a brake / manual operation unit 13, and a control unit 14 from the mounting bracket 2 </ b> L side. Is wound between the drive sprocket 16 mounted on the output shaft (not shown) of the speed reduction unit 11 and the driven sprocket 17 mounted on the support shaft 3 of the take-up drum 1 after being decelerated by the speed reduction unit 11. Is transmitted to the take-up drum 1 through the chain 18. The shutter curtain 19, one end of which is fixed to the winding drum 1, is wound or lowered by forward / reverse rotation of the winding drum 1. The shutter curtain 19 in FIGS. 1 and 2 shows a state in which the maximum diameter is completely wound around the outer periphery of the winding drum 1.

  A sudden descent stop device 20 is attached to the left mounting bracket 2L in a region surrounded by the drive sprocket 16, the driven sprocket 17, and the chain 18 and at a position facing the driven sprocket 17. As shown in enlarged detail in FIGS. 5 to 8, the sudden descent stop device 20 includes a casing 21 fixed to the mounting bracket 2 </ b> L, and a shaft 23 around the shaft 21 via a pair of bearings 22 and 22. A timing wheel 25 that is rotatably supported and meshes with the driven sprocket 17 through an opening 24 provided in the casing 21 and a shaft portion 23 of the timing wheel 25 so as to rotate integrally with the timing wheel 25. Are arranged in the casing 21 and a plurality of receiving grooves 26, 26,... Are formed at a predetermined interval at the peripheral edge, and a plurality of receiving grooves 26 respectively accommodated in the receiving grooves 26 of the locking wheel 27 are provided. Spherical rotating bodies 28, 28,...

The casing 21 is composed of a lower case 21a, an intermediate case 21b, and an upper case 21c on the mounting surface side, and two upper and lower portions that extend parallel to each other in the horizontal direction on the outer surface of the lower case 21a that is the mounting surface of the casing 21. A convex portion 33 sandwiched between the two step portions 31 and 32 is formed, and bolting portions 34 and 35 protruding upward or downward are formed on the upper end surface and the lower end surface of the lower case 21a, respectively. ing. Then, the bolts 37 (see FIG. 1) are fastened with the bolt fastening parts 34, 35 in a state where the convex part 33 is fitted in a horizontally-long rectangular cutout part 36 provided on the mounting bracket 2L. The casing 21 is attached to the mounting bracket 2L.

  A timing wheel 25 is disposed in a space between the lower case 21 a and the middle case 21 b of the casing 21, and a lock wheel 27 is disposed in a space on the middle case 21 b side of the casing 21. As shown in FIG. 9, the timing wheel 25 has a gear-like shape, and a shaft portion 23 is integrally formed or provided on the shaft center thereof. An anti-rotation portion 41 having a substantially square cross section is formed at a portion where the lock wheel 27 is fitted. Further, as shown in FIG. 10, the lock wheel 27 has a gear shape formed by forming a plurality of receiving grooves 26, 26,... Is provided with a fitting hole 42 into which the shaft portion 23 of the timing wheel 25 is fitted in a non-rotating state.

  Further, a lock case 43 that allows the rotation of the lock wheel 27 and surrounds the outer periphery thereof is disposed in the middle case 21b of the casing 21 so as to be capable of relative rotational displacement around the axis of the lock wheel 27. The case 43 includes a case main body 43a and a case cover 43b. A fitting groove 44 is formed on the inner peripheral surface of the case main body 43a of the lock case 43 at the upper portion thereof, and the lock wheel 27 is rotated as shown in FIG. The rotating body 28 that protrudes from the receiving groove 26 is sandwiched between the end portions of the fitting groove 44 so as to exhibit a stop function.

  A plurality of insertion holes 45, 45,... Are provided at predetermined intervals along the circumferential direction between the outer peripheral surface of the lock case 43 and the inner peripheral surface of the casing 21 (specifically, the inner case 21b). In each insertion hole 45, a cylindrical elastic body 46 made of urethane resin or the like for restricting relative rotational displacement between the lock case 43 and the casing 21 is inserted and arranged. 5 and 6, reference numeral 50 denotes a limit switch for detecting the operation of the sudden descent stop device 20 fixed to the upper case 21 c of the casing 43. The lever 51 of the limit switch 50 is connected to the lock case 43. One end portion is provided corresponding to an operating pin 53 as a contacted member that is implanted and protrudes from an arc-shaped long hole 52 formed in the upper case 21 c of the casing 21.

  Next, the operation of the sudden descent stop device 20 will be described. When the shutter curtain 19 descends at a normal speed by the operation of the opening / closing device 8, the timing wheel 25 and the lock wheel 27 of the sudden descent stop device 20 are driven sprockets 17. The rotation speed is set to be relatively small. For this reason, the rotating body 28 accommodated in each accommodation groove 26 of the lock wheel 27 has its own weight when the accommodation groove 26 changes to a position above the shaft portion 23 as the lock wheel 27 rotates. Rolling to the bottom side of the lock case 43 and is not pinched by the terminal end of the fitting groove 44 of the lock case 43.

  On the other hand, when the shutter curtain 19 suddenly descends due to breakage of the chain 18 or failure of the control unit 14 of the opening / closing device 8, the lock wheel 27 of the sudden drop stop device 20 rotates at a high speed. The rotating body 28 housed in the housing groove 26 projects from the housing groove 26 to the fitting groove 44 side of the lock case 43 due to centrifugal force and is sandwiched between the end portions of the fitting groove 44 to exert a stop function. As a result, regardless of the cause of the failure, it is possible to reliably prevent the shutter curtain 10 from being suddenly lowered and to improve safety.

  Moreover, in order to equip the sudden descent stop device 20, there is no need for a space on the outer side of the mounting brackets 2L and 2R as in the prior art, and it can be easily attached to an existing architectural shutter by retrofitting. Therefore, the applicable range is widened, and the effect of excellent practicality can be obtained.

  In particular, in the case of the present embodiment, when the rotating body 28 is sandwiched between the lock wheel 27 at the end portion of the fitting groove 44 of the lock case 43 and exhibits a stop function, the outer peripheral surface of the lock case 43 and the casing 21. Are elastically deformed to absorb the impact force, so that the rotating body 28 and the lock wheel 27 can be prevented from being damaged. Durability can be improved. Further, in order to prevent this damage, it is possible to suppress an increase in size accompanying an increase in the strength of the components, and thus an increase in the size of the sudden descent stop device 20 itself, which can contribute to the reduction in size.

  Further, the casing 21 of the sudden descent stop device 20 is attached to the mounting bracket 2L by the bolt 37 with the projection 33 on the mounting surface side fitted in the notch 36 of the mounting bracket 2L. While limiting the number of stops to two, it is possible to secure a mounting strength that can sufficiently withstand the impact force when the stop function is exhibited, which is effective for implementation.

  Further, when the sudden descent stop device 20 exhibits a stop function, the plurality of elastic bodies 46, 46,... Are elastically deformed, and a relative rotational displacement about the axis between the lock case 43 and the casing 21 occurs. As a result, the lever 51 of the limit switch 50 comes into contact with the operating pin 53 planted in the lock case 43 to detect when the sudden descent stop device 20 is operating. The detection signal of the limit switch 50 is input to the control unit 14 of the switch 8 or the like, and can be used for troubleshooting.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the sudden descent stop device 20 of the above-described embodiment, the timing wheel 25 that meshes with the driven sprocket 17 is not limited to the gear-shaped one as in the embodiment, and for example, the peripheral portions of two circular plates are arranged at predetermined intervals. It may be formed by connecting with a plurality of connecting pins.

  Moreover, although the said embodiment described the case where the notch part 36 which fits the convex part 33 provided in the casing 21 attachment surface of the sudden descent stop apparatus 20 was provided in the attachment bracket 2L which attaches the sudden descent stop apparatus 20, this book In the present invention, in the case where an insertion groove for inserting the support shaft 3 of the winding drum 1 or the like is provided in the mounting bracket instead of providing the notch portion 36, a protrusion is made by utilizing a part of the insertion groove. The casing 21 may be attached to the mounting bracket by bolting in a state where the portion 33 is fitted.

It is a figure which shows the attachment state of the attachment bracket by the switch attachment side of the construction shutter which concerns on embodiment of this invention. It is sectional drawing in the XX line of FIG. 1 which shows the support structure of the winding-up drum of the said architectural shutter. The mounting bracket on the switch mounting side is shown, (a) is a front view, and (b) is a side view. It is a side view of the switch attached to the mounting bracket. It is a front view of a sudden descent stop device. It is the arrow view seen from the Y direction of FIG. It is sectional drawing in the ZZ line | wire of FIG. It is sectional drawing in the EE line | wire of FIG. It is a perspective view of a timing vehicle. It is a perspective view of a lock wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding drum 2L, 2R Mounting bracket 3, 4 Support shaft 8 Opening and closing device 16 Drive sprocket 17 Driven sprocket 18 Chain 19 Shutter curtain 20 Rapid descent stop device 21 Casing 24 Opening portion 25 Timing wheel 26 Receiving groove 27 Lock wheel 28 Rotating body 31 , 32 Stepped portion 33 Convex portion 36 Notch portion 37 Bolt 43 Lock case 44 Fitting groove 46 Elastic body

Claims (4)

Both ends of the take-up drum of the shutter curtain are rotatably supported by a pair of left and right mounting brackets via respective support shafts, and an opening / closing machine is attached to one of the mounting brackets and attached to the output shaft of this opening / closing machine In an architectural shutter in which a chain is wound between a drive sprocket and a driven sprocket attached to the spindle of the winding drum,
One mounting bracket is provided with a sudden descent stop device in a region surrounded by the drive sprocket, driven sprocket, and chain and at a position facing the driven sprocket, and this sudden descent stop device is fixed to the mounting bracket. A timing wheel that is rotatably supported in the casing and meshes with the driven sprocket through an opening provided in the casing, and is disposed in the casing so as to rotate integrally with the timing wheel. A lock wheel having a plurality of receiving grooves formed in the section and a plurality of rotating bodies respectively housed in the receiving grooves of the lock wheel, and when the winding drum is abnormally rotated due to a sudden drop of the shutter curtain, End of the fitting groove formed on the inner peripheral surface side of the casing by the rotating body that jumps out of the receiving groove Building shutters, characterized by being configured to exert a stopping function by being sandwiched between.   In the casing, a lock case formed with the fitting groove on the inner peripheral surface is disposed so as to be capable of relative rotational displacement around the axis of the lock wheel, and between the lock case and the casing. The architectural shutter according to claim 1, wherein an elastic body for restricting relative rotational displacement between the two is interposed. A convex portion sandwiched between two upper and lower step portions extending in parallel with each other in the horizontal direction is formed on the mounting surface side of the casing, and the casing is fitted in the notch portion provided in the mounting bracket. The architectural shutter according to claim 1 or 2, wherein the shutter is attached to the mounting bracket by bolts. Position of the mounting bracket on the switch mounting side that rotatably supports one end of the take-up drum in a region sandwiched between the drive sprocket on the switch side, the driven sprocket on the take-up drum side, and the chain, and facing the driven sprocket A descent stop device for architectural shutters attached to
A casing fixed to the mounting bracket;
A timing wheel that is rotatably supported in the casing and meshes with the driven sprocket through an opening provided in the casing;
A lock wheel disposed in the casing so as to rotate integrally with the timing wheel and having a plurality of receiving grooves formed in a peripheral portion;
A plurality of rotating bodies respectively housed in each housing groove of the lock wheel,
The rotating body that pops out from the lock groove of the lock wheel during abnormal rotation of the take-up drum due to the sudden drop of the shutter curtain is sandwiched by the end of the fitting groove formed on the inner peripheral surface side of the casing so as to exert a stop function. A device for suddenly stopping descent of an architectural shutter, characterized in that it is configured.