JP6543544B2 - Rapid stop device - Google Patents

Description

  The present invention relates to a rapid rotation stop device, and more particularly to a rapid rotation stop device capable of improving reliability.

  The architectural shutter is a device that rolls up and rolls down the shutter curtain with a drum that rotates at a constant speed. However, if an abnormality occurs in which the drum is in a free state, the shutter curtain wound around the drum may fall by its own weight. A rapid rotation stop device for preventing this is known (Patent Document 1). The rapid rotation stop device disclosed in Patent Document 1 engages a lock between a lock wheel that rotates integrally with a drum, a plurality of rotating bodies accommodated in each accommodation groove of the lock wheel, and the lock wheel. It has a lock case to be inserted. The lock case is arranged to be rotatable relative to the lock car, and an elastic body is interposed between the periphery of the lock case and the case. If the drum is in a free state and the shutter curtain falls by its own weight and the rotation speed of the drum rises, the lock wheel, which rotates integrally with the drum, turns rapidly, and the rotating body jumps out of the storage groove by centrifugal force Is bitten between the lock car and the lock case. When the rotating body is engaged, the lock case rotates integrally with the lock wheel, and the elastic body interposed between the periphery of the lock case and the case stops the rotation of the lock case and the lock wheel.

JP, 2010-133110, A

  However, in the technique disclosed in Patent Document 1, when the lock case is stopped, a shearing force acts on the elastic body sandwiched between the lock case and the case. Since a concentrated load in the rotational direction acts on the elastic body, the elastic body is likely to be damaged, and the reliability may be reduced.

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a rapid rotation stop device capable of improving the reliability.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the rapid rotation stopping device of claim 1, the rotation is input to the input shaft, and the rotating member rotates integrally with the input shaft. At the time of rapid rotation where the number of rotations of the rotating member increases, the protrusion projects outward in the radial direction from the maximum diameter of the rotation locus at the time of normal rotation by centrifugal force. When the first member receives the projection, the first member rotates with the rotating member. The first member is provided with a first inclined surface that rotates integrally with the first member in a spiral shape around the axis of the first member. The second member is provided with a helical second inclined surface that is in surface contact with the first inclined surface in the axial direction. When the second inclined surface of the second member is pushed by the first inclined surface of the first member and an axial force acts on the second member, the second member is received by the receiving member. The second inclined surface of the second member is in surface contact with the first inclined surface of the first member when the first member stops, so that the load in the rotational direction acting on the first member and the second member is divided by the slope It can be dispersed into force and axial component. Since the load is received by the surface, it is possible to make the first member and the second member less likely to be broken, and it is possible to improve the reliability.

  According to the second aspect of the present invention, since the elastic portion elastically receives the axial force acting on the second member, in addition to the effect of the first aspect, the impact when the rotation is stopped is alleviated. There is an effect that can be done.

  According to the rapid rotation stopping device of the third aspect, the second member is disposed movably in the axial direction with respect to the receiving member. A first elastic body intervenes between an axial end face of the second member and the receiving member, and the first elastic body elastically restricts axial movement of the second member. Since the axial movement of the second member can be elastically restricted to stop the rotation of the first member while reducing the impact of the first member and the second member by the first elastic body, the effect of claim 2 can be obtained. In addition, the structure can be simplified, and the impact when the rotation is stopped can be further mitigated.

  According to the rapid rotation stopping device of the fourth aspect, the second elastic body elastically restricts the rotation of the second member with respect to the receiving member. In addition to elastically restricting the axial movement of the second member, since the rotation of the second member can be elastically restricted to stop the rotation of the first member, in addition to the effect of claim 2 or 3, It has the effect of being able to further reduce the impact when the rotation stops.

  According to the rapid rotation stopping device of the fifth aspect, the friction material is interposed between the end face in the axial direction of the first member and the receiving member. Since the first member slides on the friction material, the rotational resistance of the first member can be reduced by the frictional resistance of the friction material. Since the load acting on the first inclined surface and the second inclined surface can be reduced if the rotational speed of the first member decreases, in addition to the effect of any one of claims 1 to 4, the impact when the rotation is stopped is alleviated. There is an effect that can be done.

It is a side view of a shutter for buildings in which a rapid-rotation stop device in a 1st embodiment of the present invention was installed. It is an exploded view of a rapid rotation stop device. It is sectional drawing of the rapid-rotation stop apparatus in the III-III line of FIG. (A) is a front view of a 1st member, (b) is a side view of the 1st member seen from the arrow IVb direction of (a), (c) is a perspective view of a 1st member. (A) is a front view of a 2nd member, (b) is sectional drawing of the 2nd member in the Vb-Vb line | wire of (a), (c) is a perspective view of a 2nd member. (A) is a front view of the rapid rotation stop device at the time of normal rotation, (b) is a front view of the rapid rotation stop device at the time of rapid rotation. It is a front view of the rapid-rotation stop device in 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. FIG. 1 is a side view of an architectural shutter 1 on which a rapid rotation stopping device 10 according to a first embodiment of the present invention is installed. The architectural shutter 1 is an apparatus for rolling up and lowering a shutter curtain (not shown) that opens and closes an opening of a building, and is disposed on a bracket 2 attached to a wall surface. The architectural shutter 1 includes a switch 3 attached to the bracket 2 and a drum 8 rotated by the switch 3. The drum 8 is a cylindrical member that takes up a shutter curtain (not shown), and is supported by the support shaft 7. The support shaft 7 is a member extending in the axial direction (vertical direction in FIG. 1), and has a first end supported by the bracket 2 and a second end supported by a bracket (not shown) opposed to the bracket 2 . Only the bracket 2 which supports the 1st end side of the spindle 7 is shown in figure by FIG.

  The switch 3 is a device that generates a rotational drive force, and includes a motor and a reduction gear (neither is shown). The rotational driving force of the motor is transmitted to the drum 8 through the driven sprocket 4 mounted on the output shaft of the reduction gear, the chain 5 and the driven sprocket 6 mounted on the support shaft 7 after being decelerated by the reduction gear . The forward and reverse rotation of the switch 3 rotates the drum 8 forward and reverse, and the shutter curtain (not shown) whose one end is fixed to the drum 8 is wound up or down. In the bracket 2, a rapid rotation stopping device 10 is attached at a position opposed to the driven sprocket 6 in a region surrounded by the driving sprocket 3, the driven sprocket 6 and the chain 5.

  The rapid rotation stopping device 10 will be described with reference to FIGS. 2 and 3. 2 is an exploded view of the rapid rotation stopping device 10, and FIG. 3 is a cross-sectional view of the rapid rotation stopping device 10 taken along line III-III of FIG. The rapid rotation stopping device 10 is a device for stopping the rapid rotation of the drum 8 when the shutter curtain falls sharply due to a failure of the switch 3 or the cutting of the chain 5 or the like.

  As shown in FIG. 2, the rapid rotation stopping device 10 includes a receiving member 11 bolted to the bracket 2 (see FIG. 3), a cover 21 bolted to the receiving member 11, and an input member 30 to which rotation is input. And a rotating member 40 that rotates integrally with the input member 30, and a first member 50 and a second member 60 arranged side by side with the rotating member 40. The input member 30, the rotating member 40, the first member 50 and the second member 60 are accommodated between the receiving member 11 and the cover 21.

  The receiving member 11 is a part of the case of the rapid rotation stopping device 10, and has an annular portion 12 formed in an annular shape, concave portions 13 provided at a plurality of locations on the inner peripheral surface of the annular portion 12, and the annular ring A bottom portion 14 connected to the inside of the portion 12 and a housing portion 15 formed at the center of the bottom portion 14 are provided. The receiving member 11 is integrally formed of hard synthetic resin, metal or the like.

  The annular portion 12 is a portion that forms the outer shell of the rapid rotation stopping device 10. The bottom portion 14 is a portion whose thickness is set thinner than the axial thickness (the dimension in the vertical direction in FIG. 3) of the annular portion 12 and is connected to one end of the annular portion 12 in the axial direction. The recess 13 is a portion which is cut out in a semicircular shape radially outward from the inner peripheral surface of the annular portion 12 along the axial direction of the annular portion 12, and the interval equal to the circumferential direction of the annular portion 12 Are formed in a plurality of places (four places in the present embodiment). The housing portion 15 is a portion into which the bearing 16 is inserted.

  The cover 21 is a member that constitutes the case of the rapid rotation stopping device 10 together with the receiving member 11, and has a fan-like attachment portion 22 attached to the annular portion 12 of the reception member 11 and a overhang that overhangs from the attachment portion 22. It comprises a projecting portion 23 and a housing portion 24 formed in the projecting portion 23. The cover 21 is integrally formed of hard synthetic resin or metal. As shown in FIG. 3, the attachment portion 22 is attached to the annular portion 12 so as to be substantially parallel to the bottom portion 14. The overhanging portion 23 is a portion for preventing interference between the driven sprocket 6 and the input member 30 and the cover 21. The housing portion 24 is a portion into which the bearing 25 is inserted.

  Referring back to FIG. The input member 30 is a member to which rotation is input from the driven sprocket 6, and includes an input shaft 31 attached to the bearings 16 and 25 and a gear 32 integrally formed with the input shaft 31. The rotation of the driven sprocket 6 is input to the input shaft 31 as the gear 32 meshes with the driven sprocket 6.

  The rotating member 40 is a member that rotates integrally with the input shaft 31 and includes a main body 41 formed in a disk shape. The rotating member 40 is integrally formed of hard synthetic resin, metal or the like, and the arm 45 (protruding portion) is attached to the main body 41. In the main body 41, a first hole 42 penetrating in the thickness direction (axial direction) is formed at the center, and a second hole 44 penetrating in the thickness direction is formed at a position different from the first hole 42 . The input shaft 31 of the input member 30 is inserted into the first hole 42 so as not to allow relative rotation. In the main body 41, a housing groove 43 in which the arm 45 is housed is formed on the outer circumferential surface along the circumferential direction. The receiving groove 43 is connected to the second hole 44 and is separated from the first hole 42.

  The arm 45 is a metal member housed in the housing groove 43 and is formed in a substantially L shape having a first end 46 and a second end 47. In the arm 45, the through hole 48 through which the pin 49 is inserted penetrates in the thickness direction near the second end 47. The pin 49 penetrating the through hole 48 is fixed to a second hole 44 formed in the main body 41. The depth of the receiving groove 43 is larger than that of the arm 45, so that the arm 45 swings around the pin 49 with respect to the main body 41.

  In the rotating member 40, a spring S (a compression coil spring, see FIG. 6A) is interposed between the second end 47 of the arm 45 housed in the housing groove 43 and the main body 41 (the groove bottom of the housing groove 43). . The spring S restores and biases the arm 45 centering on the pin 49 in a direction in which the distance between the first end 46 of the arm 45 and the main body 41 (groove bottom) is narrowed. The restoring force of the spring S and the mass of the arm 45 cause the first end 46 of the arm 45 to abut the groove bottom of the accommodation groove 43 by the restoring force of the spring S when the rotating member 40 rotating about the input shaft 31 rotates normally. The first end 46 of the arm 45 is set so as to come out of the accommodation groove 43 by centrifugal force when the rotation member 40 abnormally rotates (sudently rotates).

  As a result, during abnormal rotation of the rotating member 40, the first end 46 protrudes outward in the radial direction of the rotation trajectory of the first end 46 during normal rotation. Since the first end 46 is made to project at the time of abnormal rotation of the rotating member 40 using the restoring force of the spring S, the angle of the rapid rotation stopping device 10 with respect to the vertical direction when the rapid rotation stopping device 10 is attached, the rapid rotation stopping device 10 It is not necessary to consider the upper and lower directions of Therefore, the rapid rotation stopping device 10 can facilitate the mounting operation as compared with a device (for example, a device described in Patent Document 1) in which the rotation locus at the time of abnormal rotation is made different by using gravity.

  With reference to FIG. 4, the 1st member 50 arrange | positioned at the radial direction outer side of the rotation member 40 is demonstrated. 4 (a) is a front view of the first member 50, FIG. 4 (b) is a side view of the first member 50 seen from the direction of the arrow IVb of FIG. 4 (a), and FIG. 5 is a perspective view of a first member 50. FIG. In the first member 50, a plurality of inner circumferential notches 52 are formed on the inner circumferential surface of the main body 51 formed in an annular shape of hard synthetic resin, metal or the like, and an outer circumferential notch 53 is formed on the outer circumferential surface of the main body 51 It is done. The inner circumferential notch 52 is a portion which is notched from the inner circumferential surface toward the outer side in the radial direction of the main body 51 and toward one side in the circumferential direction. The inner end notch 52 engages the first end 46 when the arm 45 (first end 46) protrudes outward in the radial direction of the rotation locus of the rotating member 40 (see FIG. 2).

  The outer peripheral notch 53 is a portion formed from the outer peripheral surface toward the inner side in the radial direction of the main body 51, and is continuously formed in a region of about 3/4 the length of the outer peripheral surface of the main body 51 There is. The outer peripheral notch 53 is formed so as to leave a part of the periphery of the outer peripheral surface of the main body 51, and since the end face in the axial direction of the left part is inclined in one direction along the outer periphery, it is spirally inclined. A first inclined surface 54 is formed around the body 51.

  Returning to FIG. 2, the second member 60 will be described. The second member 60 is an annular member disposed on the outer side in the radial direction of the first member 50, and is integrally formed of hard synthetic resin, metal, or the like. The second member 60 will be further described with reference to FIG. 5 (a) is a front view of the second member 60, FIG. 5 (b) is a cross-sectional view of the second member 60 taken along line Vb-Vb of FIG. 5 (a), and FIG. FIG.

  In the second member 60, a convex portion 62 is provided on the inner peripheral surface of the main body 61 formed in an annular shape. The convex portion 62 is a portion projecting radially inward from the inner peripheral surface of the main body 61, and is continuously formed in a region of about 3⁄4 of the circumferential length of the inner peripheral surface of the main body 61 There is. The axial length (thickness) of the convex portion 62 is set to be smaller than the axial length (thickness) of the main body 61, and the axial end face is inclined in one direction along the inner periphery. A helically inclined second inclined surface 63 is formed on the inner peripheral surface of the main body 61. When the first member 50 is disposed inward in the radial direction of the second member 60, the second inclined surface 63 faces the first inclined surface 54 of the first member 50, and the first inclined surface 54 and the second inclined surface 63 make surface contact with each other.

  In the second member 60, recesses 64 are provided at a plurality of locations on the outer peripheral surface of the main body 61. The concave portions 64 are portions cut in a semicircular shape radially inward from the outer peripheral surface of the main body 61 along the axial direction of the main body 61, and a plurality of places (portions are formed at equal intervals in the circumferential direction of the main body 61). In the embodiment, it is formed at four places. The outer diameter of the second member 60 is set to be slightly smaller than the inner diameter of the annular portion 12 of the receiving member 11. This is for positioning and accommodating the second member 60 in the receiving member 11.

  Returning to FIG. 2, the direction of the spiral of the first inclined surface 54 of the first member 50 and the second inclined surface 63 of the second member 60 will be described. The rotating member 40 rotates counterclockwise in FIG. 2 around the input shaft 31 during abnormal rotation (during sudden rotation). When the first end 46 of the arm 45 engages with the inner circumferential notch 52 of the first member 50, the first member 50 rotates in the same direction as the rotating member 40 (counterclockwise in FIG. 2). When the first member 50 rotates in the same direction as the rotating member 40 (counterclockwise in FIG. 2), the first inclined surface 54 advances and the first inclined surface 54 The direction of the spiral is such that it is pressed against the inclined surface 63.

  As shown in FIG. 3, the friction material 70 is disposed between the main body 51 (first member 50) and the attachment portion 22 (cover 21), and the friction member 70 is provided between the main body 51 (first member 50) and the bottom portion 12 (receiving member 11). The friction material 71 is disposed between them. The first elastic body 72 is disposed between the main body 61 (second member 60) and the bottom 12 (receiving member 11). The friction members 70 and 71 are sheet-like ring-shaped members that reduce the rotational speed of the first member 50 by friction, and are pressed against the first member 50 by the bottom portion 14 of the receiving member 11 and the attachment portion 22 of the cover 21. The friction members 70 and 71 are made of an organic or metallic member used for a disc brake pad such as a car, a rail car, an industrial machine, a brake lining, and the like. It is because it is excellent in abrasion resistance and heat resistance.

  The first elastic body 72 is a sheet-like ring-shaped member which elastically restricts the axial movement of the second member 60, and the position is restricted by the bottom portion 14 of the receiving member 11 and the attachment portion 22 of the cover 21. It contacts the end face of the second member 60 on the receiving member 11 side. The first elastic body 72 is formed of rubber, thermoplastic elastomer such as polyurethane, soft synthetic resin foam such as soft urethane foam, or the like. The second member 60 is disposed between the receiving member 11 and the cover 21 so as to be axially displaceable by the amount by which the first elastic body 72 is elastically deformed.

  The second member 60 is disposed inside the annular portion 12 of the receiving member 11 with the position of the recess 64 aligned with the position of the recess 13 of the receiving member 11. The second elastic body 73 is inserted into the recesses 13 and 64 which are made to coincide. The second elastic body 73 is a cylindrical member which elastically restricts the rotation of the second member 60. The second elastic body 73 is formed of rubber, thermoplastic elastomer such as polyurethane, soft synthetic resin foam such as soft urethane foam, or the like.

  The operation of the rapid rotation stopping device 10 will be described with reference to FIGS. 1 and 6. 6 (a) is a front view of the rapid rotation stopping device 10 during normal rotation, and FIG. 6 (b) is a front view of the rapid rotation stopping device 10 during rapid rotation. 6 (a) and 6 (b), illustration of the cover 21 and the input member 30 is abbreviate | omitted in order to understand easily.

  As shown in FIG. 1, when the switch 3 is driven, the drum 8 is rotated via the drive sprocket 4, the chain 5 and the driven sprocket 6. When the shutter curtain (not shown) wound around the drum 8 is wound, the switch 3 is rotated forward so that the driven sprocket 6 rotates counterclockwise in FIG. 1, and when the shutter curtain is pulled, the driven sprocket 6 is rotated. The switch 3 is reversely rotated so as to rotate clockwise. Since the rotation is input to the rotating member 40 via the input member 30 with the rotation of the driven sprocket 6, the main body 41 (rotating member 40) rotates clockwise in FIG. 6A when the shutter curtain is wound, When the shutter curtain is lowered, the main body 41 (rotating member 40) rotates counterclockwise in FIG. The arm 45 is biased by the spring S. Therefore, as shown in FIG. 6A, the arm 45 has the first end 46 as the main body 41 as shown in FIG. It makes close contact with (the groove bottom of the accommodation groove 43) and rotates.

  When the shutter curtain is suddenly dropped by its own weight due to an abnormality such as failure of the switch 3 or cutting of the chain 5, the main body 41 (rotating member 40) is rapidly rotated counterclockwise as shown in FIG. Accelerated rotation). When the centrifugal force (inertial force) acting on the arm 45 rotating integrally with the rotating member 40 resists the elastic force of the spring S, the arm 45 rotates around the pin 49 and the maximum diameter of the rotation locus of the arm 45 The first end 46 protrudes radially outward. When the first end 46 of the arm 45 engages with the inner circumferential notch 52 formed in the main body 51 (first member 50), the first member 50 rotates with the rotation member 40.

  Since the friction member 71 is disposed between the receiving member 11 and the friction member 70 is disposed between the receiving member 11 and the cover 21, the axial end face of the first member 50 slides with the friction members 70 and 71. . Since the rotational speed of the first member 50 is reduced due to the frictional resistance of the friction members 70 and 71, the rotational speed of the rotating member 40 is reduced accordingly. Since the energy of the rotating member 40 and the first member 50 is reduced, it is possible to ease the impact when the rotation of the rotating member 40 is stopped. By relieving the impact at the time of stopping, it is possible to prevent damage to the counterpart material such as the driven sprocket 6 or the like that inputs rotation to the input shaft 31.

  As the first member 50 rotates, the first inclined surface 54 integrally formed on the first member 50 also rotates. When the first member 50 rotates in the same direction as the rotation member 40, the first inclined surface 54 and the second inclined surface 63 advance the first inclined surface 54 to press the first inclined surface 54 against the second inclined surface 63. It is set in the direction of the spiral. As a result, the load in the rotational direction acting on the first member 50 and the second member 60 can be dispersed into the component force of the slope and the component force of the axial direction by the first inclined surface 54 and the second inclined surface 63. The first member 50 and the second member 60 are spirals of the first inclined surface 54 and the second inclined surface 63 so that an axial component acting on the second member 60 is a force directed to the receiving member 11. The orientation of is set.

  Since the second member 60 acting on the axial component force toward the receiving member 11 is received by the receiving member 11 and the axial movement is restricted, the rotation of the first member 50 and the rotating member 40 is stopped. Can. Since the first inclined surface 54 and the second inclined surface 63 are in surface contact with each other and receive the load by the surface, the load can be dispersed to make it difficult to damage the first member 50 or the second member 60. Even when the abnormality is repeatedly generated and the rapid rotation stopping device 10 is operated many times, since the first member 50 and the second member 60 are hardly damaged, the rotation of the rotating member 40 can be reliably stopped. Therefore, the reliability of the rapid rotation stopping device 10 can be improved.

  Since the first elastic body 72 is disposed between the second member 60 and the receiving member 11, when an axial component force toward the receiving member 11 acts on the second member 60, the receiving member 11 and the second member 60 And the first elastic body 72 sandwiched therebetween elastically restricts the axial movement of the second member 60. Therefore, the rotation of the rotation member 40 and the first member 50 can be reliably stopped while alleviating the impact when the rotation of the rotation member 40 is stopped. Further, since the first elastic body 72 is disposed between the second member 60 and the receiving member 11, the pressure receiving area (the area of the end face in the axial direction) of the second member 60 can be secured. Since the second member 60, the receiving member 11, and the first elastic body 72 can be hardly broken with a simple structure, durability can be ensured.

  The second elastic body 73 is inserted into the recessed portions 13 and 64 which exist between the outer peripheral surface of the second member 60 and the inner peripheral surface of the annular portion 12 of the receiving member 11. Therefore, when the component of the slope (component of rotational direction) acting on the second member 60 by the first inclined surface 54 and the second inclined surface 63 rotates the second member 60, the second elastic body 73 The rotation of the second member 60 is elastically restricted. Therefore, compared with a rapid rotation stopping device without the second elastic body 73, the rotation of the first member 50 can be stopped earlier while easing the impact when the rotation is stopped.

  In addition, since the first elastic body 72 is disposed between the second member 60 on which the component force in the axial direction toward the receiving member 11 acts and the receiving member 11 and the receiving member 11 is attached to the bracket 2, the receiving member 11 is The load resistance can be secured by making the If the direction of the spiral of the first inclined surface 54 and the second inclined surface 63 is set so that the axial component force acting on the second member 60 becomes the force toward the cover 21, the cover 21 is received. Since the bolt is fixed to the member 11, the cover 21 may be broken around the bolt under an axial load. On the other hand, in the rapid rotation stopping device 10, since the receiving member 11 attached to the bracket 2 receives the second member 60, the breakage of the cover 21 can be prevented and the durability can be ensured.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the rotating member 40 is integrally rotated with the first member 50 by jumping out of the arm 45 fixed to the rotating member 40 by the pin 49 at the time of rapid rotation has been described. On the other hand, in the second embodiment, the case where the rotary member 81 is integrally rotated with the first member 84 by jumping out when the rotary body 83 housed in the housing groove 82 of the rotary member 81 is suddenly rotated will be described. . In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 7 is a front view of the rapid rotation stopping device 80 in the second embodiment. In FIG. 7, the illustration of the cover 21 and the input member 30 is omitted to facilitate understanding.

  The rapid rotation stopping device 80 includes a receiving member 11 (annular portion 12), a rotating member 81 having a plurality of receiving grooves 82 formed at its periphery, and a plurality of rotating bodies received in the receiving grooves 82 of the rotating member 81. 83 (protrusion part) and the 1st member 84 by which the fitting groove 85 which receives the rotary body 83 was formed in the internal peripheral surface is provided. The rotating member 81 is a member that rotates integrally with the input shaft 31 (see FIG. 2), and the outer diameter is set to be slightly smaller than the inner diameter of the first member 84 excluding the fitting groove 85. The radial depth of the fitting groove 85 is set smaller than the diameter of the rotary body 83. The rotating member 81 and the rotating body 83 are formed of hard synthetic resin or metal.

  The depth of the housing groove 82 of the rotary member 81 is set sufficiently larger than the diameter of the rotary body 83, and the length in the axial direction (vertical direction in FIG. 7) is slightly larger than the diameter of the rotary body 83. It is set. Therefore, the rotary body 83 can move relatively freely in the depth direction of the housing groove 82.

  The first inclined surface 54 is formed on the outer circumferential surface of the first member 84, and the first member 84 is disposed so as to be rotatable relative to the second member 60 (main body 61). The first inclined surface 54 is in surface contact with the second inclined surface 63 formed on the inner peripheral surface of the second member 60 (main body 61) in the axial direction. In the rapid rotation stopping device 80, the receiving member 11 (annular portion 12) is attached to the bracket 2 (see FIG. 1) such that the end of the fitting groove 85 formed in the first member 84 is positioned at the uppermost in the vertical direction. It is attached.

  Next, the operation of the rapid rotation stopping device 80 will be described. When rotation is input from the driven sprocket 6 (see FIG. 1) to the input member 30 (see FIG. 2), the rotation member 81 rotates integrally with the input shaft 31. When the shutter curtain (not shown) is lowered, the rotating member 81 rotates counterclockwise in FIG. Since the rotational speed at that time is set to be relatively small, in the rotary body 83 housed in the housing groove 82 of the rotary member 81, the housing groove 82 is above the input shaft 31 (see FIG. 2) in the vertical direction. Once located, it moves to the bottom side of the accommodation groove 82 by its own weight. Since the rotary body 83 is not pinched at the end of the fitting groove 85 of the first member 84, the rotary member 81 can freely rotate.

  On the other hand, when the shutter curtain (not shown) starts to descend due to the cutting of the chain 5 (see FIG. 1) or the failure of the switch 3, the rotational speed of the drum 8 and the driven sprocket 6 rapidly increases. The rotating member 81 of the rapid rotation stopping device 80 is rapidly rotated. The rotary body 83 housed in the housing groove 82 of the rotary member 81 pops out of the housing groove 82 by centrifugal force, and is pinched by the rotary member 81 and the first member 84 at the end of the fitting groove 85. As a result, the rotating member 81 and the first member 84 rotate integrally. The axial direction movement of the second member 60 and the second member 60 in which the second inclined surface 63 interferes with the first inclined surface 54 of the first member 84 and the friction members 70 and 71 in which the first member 84 slides is restricted. The rotating member 81 and the first member 84 are stopped by the function of the first elastic member 72 and the second elastic member 73 for restricting the rotation of the second member 60, which is the same as the first embodiment, so the description will be omitted. . The rapid rotation stopping device 80 can also realize the same operation and effect as the first embodiment.

  Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment, and various improvements and modifications can be made without departing from the scope of the present invention. It can be easily guessed.

  In each of the above-mentioned embodiments, although the case where the rapid rotation stopping device 10, 80 is installed on the architectural shutter 1 has been described, the present invention is not limited to this. Naturally, it is possible to appropriately adopt the rapid rotation stopping devices 10 and 80 as a safety device against falling and unintended opening besides the architectural shutter 1.

  In each of the above-described embodiments, the load acting on the second member 60 by arranging the first elastic body 72 (elastic portion) between the receiving member 11 and the second member 60 in the sheet-like first elastic body 72. Although the case where it receives elastically is demonstrated, it is not necessarily restricted to this. It is of course possible to adopt other elastic parts. For example, by sandwiching a sheet-like elastic body (elastic portion) between the first inclined surface 54 of the first member 50, 84 and the second inclined surface 63 of the second member 60, the elastic body is elastically deformed. It is of course possible to receive a load. Further, the first members 50 and 84 and the second member 60 may be integrally formed of an elastic body (elastic portion) such as rubber, or the first inclined surface 54 or the second inclined surface 63 may be partially elastic. Of course, it is possible to form with (elastic part). Similarly, portions (parts) orthogonal to the axes of the first members 50 and 84 and the second member 60 are formed of an elastic body (elastic portion) such as rubber, or the first members 50 and 84 or the second member 60 As a matter of course, it is possible to divide the in the axial direction and to sandwich an elastic body (elastic part) such as rubber in the divided part. Also in these cases, since the elastic body (elastic portion) receives an axial load acting on the second member 60, the shock at the time of rotation stop is alleviated while suppressing damage to the first members 50 and 84 and the second member 60. it can.

  In each of the above embodiments, in the direction of the spiral of the first inclined surface 54 of the first member 50, 84 and the second inclined surface 63 of the second member 60, an axial component force is attached to the receiving member 11 (bracket 2 Component) was set to go to the However, the present invention is not necessarily limited thereto, and it is naturally possible to set the direction of the spiral so that an axial component force is directed to the cover 21 (a member attached to the receiving member 11). This is because the cover 21 can receive the second member 60 on which the axial load acts. In this case, the cover 21 corresponds to the receiving member according to claim 1.

  In each of the above-described embodiments, the first inclined surface 54 is continuously formed in an area of about 3⁄4 around the outer peripheral surface of the main body 51, and the second inclined surface 63 is about the periphery of the inner peripheral surface of the main body 61. Although the case where it forms in a 3/4 area | region continuously was demonstrated, it is not necessarily restricted to this. For example, it is naturally possible to divide any one of the first inclined surface 54 and the second inclined surface 63 into a plurality of pieces and intermittently provide them in the circumferential direction.

10, 80 rapid rotation stop device 11 receiving member 31 input shaft 40, 81 rotating member 46 arm (protrusion part)
50, 84 1st member 54 1st inclined surface 60 2nd member 63 2nd inclined surface 70, 71 friction material 72 1st elastic body (elastic part)
73 second elastic body 83 rotating body (protrusion)

Claims (5)

An input axis to which rotation is input,
A rotating member that rotates integrally with the input shaft;
At the time of rapid rotation where the number of rotations of the rotating member is increased, a projecting portion which protrudes outward in the radial direction from the maximum diameter of the rotation locus at the time of normal rotation by centrifugal force;
A first member which is rotated by receiving the projection;
A first inclined surface that is provided in a spiral shape around the axial center of the first member, and rotates integrally with the first member;
A second member provided with a helical second inclined surface axially in surface contact with the first inclined surface;
The second inclined surface of the second member is pushed by the first inclined surface of the first member, and a receiving member for receiving a second member on which an axial force is applied. Rotation stop device.   2. The rapid rotation stopping device according to claim 1, further comprising an elastic portion that elastically receives an axial force acting on the second member. The second member is axially movably disposed relative to the receiving member,
The elastic portion includes a first elastic body interposed between an axial end face of the second member and the receiving member,
The rapid rotation stopping device according to claim 2, wherein the first elastic body elastically restricts axial movement of the second member.   The rapid rotation stop device according to claim 2 or 3, further comprising a second elastic body that elastically restricts the rotation of the second member with respect to the receiving member. A friction material interposed between an axial end face of the first member and the receiving member;
The rapid rotation stopping device according to any one of claims 1 to 4, wherein the first member slides the friction material.

Images