External drum brake anti-falling device
An external drum brake anti-falling device includes a carrier having an accommodating chamber and a main shaft crossingly arranged in the accommodating chamber for supporting a rotating drum to autorotate, wherein the rotating drum has a life belt coiled thereon, a brake unit arranged at an end thereof, and a drum brake module, which includes a base, mounted in the accommodating chamber, and a passive ring, mounted on the base. The base has a through hole axially and penetratingly arranged thereon and a slit communicating an inside and outside of said through hole. The wall surface of the through hole is a first ring surface. An outer diameter of the passive ring is a second ring surface. The passive ring has internally ratchet teeth arranged therein. when the life belt drives the brake unit to be engaged with the ratchet teeth, thereby buffering the rotating drum and the life belt.
1 . An external drum brake anti-falling device, comprising:
a carrier, having an accommodating chamber defined therein;
a rotating drum comprising a life belt coiled thereon;
a main shaft, crossingly arranged in said accommodating chamber for supporting said rotating drum to autorotate;
a brake unit, arranged at an end of said rotating drum; and
a drum brake module, comprising a base mounted in said accommodating chamber, a passive ring mounted on said base, and a brake lining mounted on said passive ring, wherein said base has a through hole axially and penetratingly arranged thereon and a slit radially communicating an inside and an outside of said through hole, wherein a wall surface of said through hole is regarded as a first ring surface, an outer surface of said passive ring is regarded as a second ring surface, a gap formed between said first ring surface and said second ring surface for said brake lining to be fit therein, wherein said passive ring has internally ratchet teeth arranged therein, when said life belt drives said rotating drum and said brake unit to rotate to a certain speed, said brake unit engages with said ratchet teeth under a centrifugal force, wherein when said braking unit engages with said ratchet teeth of said passive ring, said passive ring is driven to rotate, wherein when the passive ring is driven to rotate, said brake lining on said passive ring generates a friction with said first ring surface, thereby effectively decelerating rotation of said passive ring and said rotating drum so as to continuously buffer the falling speed of said life belt.
2 . The external drum brake anti-falling device, as recited in claim 1 , wherein said base comprises at least a check bolt crossing said slit, wherein said slit communicates with said first ring surface, so as to allow said check bolt to rotate to adjust a width of said slit in order to change a bore diameter of said first ring surface for adjusting the maximum static friction force.
3 . The external drum brake anti-falling device, as recited in claim 2 , wherein said brake unit comprises an abuttal arranged on the end of said rotating drum, wherein said abuttal comprises a spring seat and an axle seat, wherein said axle seat comprises a centrifugal block pivotally connected therewith and a back spring mounted between said centrifugal block and said spring seat, so as to allow said back spring to drive said centrifugal block to have a constant retracting and positioning tendency, while when said life belt drives said rotating drum to rotate in the certain speed, to allow said centrifugal block to overcome said back spring and be engaged with said ratchet teeth.
4 . The external drum brake anti-falling device, as recited in claim 2 , wherein said carrier has a first hole, a second hole, and a third hole arranged thereon, respectively, wherein said brake unit comprises an abuttal mounted on said rotating drum, wherein said abuttal has a fourth hole arranged at a center thereof, and a fifth hole eccentrically arranged thereof, wherein said base has a sixth hole matching said second hole, so as to allow a screw to pass through said second hole and be locked at said sixth hole, which allows said base to be detachably mounted in the accommodating chamber.
5 . The external drum brake anti-falling device, as recited in claim 2 , further comprising a turbination spring, wherein said rotating drum has a left end and a right end arranged opposite to said left end, and an axle hole penetratingly provided at a circle center position for said main shaft to pass through, wherein said right end has an annular protruding lip axially protruded along a periphery of said axle hole, wherein said annular protruding lip has an assembling groove arranged radially therealong and an inner end of said turbination spring is mount therewith, wherein said turbination spring further has an outer end positioned on one end of said carrier in order to constantly provide a rollback force for said rotating drum to position.
6 . The external drum brake anti-falling device, as recited in claim 1 , wherein said brake lining is affixed on said second ring surface.
7 . The external drum brake anti-falling device, as recited in claim 1 , wherein said base comprises at least a check bolt crossing said slit, wherein said slit communicates with said first ring surface, so as to allow said check bolt to rotate to adjust a width of said slit in order to change a bore diameter of said first ring surface for adjusting the precompression of the fitting of the brake lining brought by the gap.
8 . The external drum brake anti-falling device, as recited in claim 7 , wherein said brake lining is affixedly arranged on said second ring surface.
9 . The external drum brake anti-falling device, as recited in claim 7 , wherein said brake unit comprises an abuttal arranged on the end of said rotating drum, wherein said abuttal comprises a spring seat and an axle seat, wherein said axle seat comprises a centrifugal block pivotally connected therewith and a back spring mounted between said centrifugal block and said spring seat, so as to allow said back spring to drive said centrifugal block to have a constant retracting and positioning tendency, while when said life belt drives said rotating drum to rotate in the certain speed, to allow said centrifugal block to overcome said back spring and be engaged with said ratchet teeth.
10 . The external drum brake anti-falling device, as recited in claim 9 , wherein said carrier has a first hole, a second hole, and a third hole arranged thereon, respectively, wherein said abuttal has a fourth hole arranged at a center thereof, and a fifth hole eccentrically arranged thereof, wherein said base has a sixth hole matching said second hole, so as to allow a screw to pass through said second hole and be locked at said sixth hole, which allows said base to be detachably mounted in the accommodating chamber.
11 . The external drum brake anti-falling device, as recited in claim 10 , further comprising a turbination spring, wherein said rotating drum has a left end and a right end arranged opposite to said left end, and an axle hole penetratingly provided at a circle center position for said main shaft to pass through, wherein said right end has an annular protruding lip axially protruded along a periphery of said axle hole, wherein said annular protruding lip has an assembling groove arranged radially therealong and an inner end of said turbination spring is mount therewith, wherein said turbination spring further has an outer end positioned on one end of said carrier in order to constantly provide a rollback force for said rotating drum to position.
12 . The external drum brake anti-falling device, as recited in claim 7 , wherein said carrier has a first hole, a second hole, and a third hole arranged thereon, respectively, wherein said brake unit comprises an abuttal mounted on said rotating drum, wherein said abuttal has a fourth hole arranged at a center thereof, and a fifth hole eccentrically arranged thereof, wherein said base has a sixth hole matching said second hole, so as to allow a screw to pass through said second hole and be locked at said sixth hole, which allows said base to be detachably mounted in the accommodating chamber.
13 . The external drum brake anti-falling device, as recited in claim 7 , further comprising a turbination spring, wherein said rotating drum has a left end and a right end arranged opposite to said left end, and an axle hole penetratingly provided at a circle center position for said main shaft to pass through, wherein said right end has an annular protruding lip axially protruded along a periphery of said axle hole, wherein said annular protruding lip has an assembling groove arranged radially therealong and an inner end of said turbination spring is mount therewith, wherein said turbination spring further has an outer end positioned on one end of said carrier in order to constantly provide a rollback force for said rotating drum to position.
14 . The external drum brake anti-falling device, as recited in claim 1 , wherein said brake unit comprises an abuttal arranged on the end of said rotating drum, wherein said abuttal comprises a spring seat and an axle seat, wherein said axle seat comprises a centrifugal block pivotally connected therewith and a back spring mounted between said centrifugal block and said spring seat, so as to allow said back spring to drive said centrifugal block to have a constant retracting and positioning tendency, while when said life belt drives said rotating drum to rotate in the certain speed, to allow said centrifugal block to overcome said back spring and be engaged with said ratchet teeth.
15 . The external drum brake anti-falling device, as recited in claim 1 , wherein said carrier has a first hole, a second hole, and a third hole arranged thereon, respectively, wherein said brake unit comprises an abuttal mounted on said rotating drum, wherein said abuttal has a fourth hole arranged at a center thereof, and a fifth hole eccentrically arranged thereof, wherein said base has a sixth hole matching said second hole, so as to allow a screw to pass through said second hole and be locked at said sixth hole, which allows said base to be detachably mounted in the accommodating chamber.
16 . The external drum brake anti-falling device, as recited in claim 1 , further comprising a turbination spring, wherein said rotating drum has a left end and a right end arranged opposite to said left end, and an axle hole penetratingly provided at a circle center position for said main shaft to pass through, wherein said right end has an annular protruding lip axially protruded along a periphery of said axle hole, wherein said annular protruding lip has an assembling groove arranged radially therealong and an inner end of said turbination spring is mount therewith, wherein said turbination spring further has an outer end positioned on one end of said carrier in order to constantly provide a rollback force for said rotating drum to position.
17 . An external drum brake anti-falling device, comprising:
a carrier, having an accommodating chamber defined therein;
a rotating drum comprising a life belt coiled thereon;
a main shaft, crossingly arranged in said accommodating chamber for supporting said rotating drum to autorotate;
a brake unit, arranged at an end of said rotating drum; and
a drum brake module, comprising a base mounted in said accommodating chamber, a passive ring rotatably mounted on said base, and a brake lining mounted on said passive ring, wherein said base has a through hole axially and penetratingly arranged thereon and a slit radially communicating an inside and an outside of said through hole, wherein a wall surface of said through hole is regarded as a first ring surface, an outer surface of said passive ring is regarded as a second ring surface, a gap formed between said first ring surface and said second ring surface for said brake lining to be fit therein, wherein said passive ring has internally ratchet teeth arranged therein.
18 . The external drum brake anti-falling device, as recited in claim 17 , wherein said brake unit comprises an abuttal arranged on the end of said rotating drum, wherein said abuttal comprises a spring seat and an axle seat, wherein said axle seat comprises a centrifugal block pivotally connected therewith and a back spring mounted between said centrifugal block and said spring seat, so as to allow said back spring to drive said centrifugal block to have a constant retracting and positioning tendency, while when said life belt drives said rotating drum to rotate in a certain speed, to allow said centrifugal block to overcome said back spring and be engaged with said ratchet teeth.