EP3278840B1 - Fall protection device - Google Patents
Fall protection device Download PDFInfo
- Publication number
- EP3278840B1 EP3278840B1 EP16182127.7A EP16182127A EP3278840B1 EP 3278840 B1 EP3278840 B1 EP 3278840B1 EP 16182127 A EP16182127 A EP 16182127A EP 3278840 B1 EP3278840 B1 EP 3278840B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary drum
- protection device
- fall protection
- retard member
- shaft lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000037396 body weight Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
- A62B35/0093—Fall arrest reel devices
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
- A62B1/08—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brake mechanisms for the winches or pulleys
- A62B1/10—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brake mechanisms for the winches or pulleys mechanically operated
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
- A62B35/0043—Lifelines, lanyards, and anchors therefore
- A62B35/0075—Details of ropes or similar equipment, e.g. between the secured person and the lifeline or anchor
Definitions
- the present invention relates generally to a safety device, and more particularly to a fall protection device suitable for high altitude environments.
- a commonly seen fall protection equipment usually includes a safety belt which ties a worker securely.
- the fall protection equipment can instantly lock the safety belt or decelerate the fall to prevent the worker from continuously falling, or to slow down the fall speed, which ensures the worker's safety.
- One type of the fall protection equipment available in the market is designed to include an elastic safety belt, which is helpful to decelerate the fall when a worker tied with the safety belt falls.
- the length and the elastic coefficient of such safety belt have to be taken into consideration according to the altitude of the working environments and the body weight of the worker; otherwise the safety belt may fail to rebound in time before the worker falling to the ground.
- the safety belt thereof has a stitched folded section.
- the stitched folded section would be torn apart to absorb part of the falling energy to decelerate the fall.
- such design would damage the structure of the safety belt, which may decrease the strength and the bearing capacity and, therefore, may be potentially dangerous.
- yet another type of fall protection equipment can instantly lock the safety belt when a worker attached thereto falls, to prevent the worker from continuously falling.
- the sudden impact e.g., G-Force
- the reaction force generated at the very moment that the fall protection equipment locks the safety belt may cause internal injuries or even break bones.
- the conventional fall protection equipment still has room for improvement.
- US2009084631 discloses a retractable lifeline assembly with a brake assembly where a friction disk is provided to slow down the rate of fall. It is mechanically complex, so it can be improved further.
- the primary objective of the present invention is to provide a fall protection device for preventing workers from falling from high altitude.
- the present invention provides a fall protection device, which is adapted to be connected to a safety belt, including a frame, a shaft lever, a retard member, and a rotary drum.
- the frame forms a containing space; the shaft lever is provided on the frame.
- the retard member is pivotally provided on the shaft lever rotatably, wherein the retard member is received in the containing space, and has a friction surface.
- the rotary drum is fitted around the retard member, wherein the rotary drum has an outer surface and an inner surface; the outer surface is adapted to be winded by the safety belt, and the inner surface faces to the friction surface of the retard member.
- the retard member and the rotary drum rotate coaxially; in a second operating state, when the safety belt is suddenly stretched, the retard member is fixed, while the rotary drum rotates relative to the retard member, wherein a rotational friction is generated between the friction surface of the retard member and the inner surface of the rotary drum, which slows down the rotational speed of the rotary drum.
- the retard member, retard member would not affect the rotation of the rotary drum. If the worker accidentally falls from high altitude and accordingly in the second operating state, the rotational friction would be generated between the retard member and the rotary drum, which reduces the rotational speed of the rotary drum. Whereby, the fall speed of the safety belt would be lowered.
- a fall protection device 100 is adapted to be connected to a safety belt 200, which is used to tie a worker securely.
- the fall protection device 100 includes a frame 10, a shaft lever 20, a retard member 30, a rotary drum 40, a turntable 50, a brake assembly 60, a side cover 70, and a spiral spring 80.
- the frame 10 includes a hanger frame 12 and a hanging ring 14 connected to the top of the hanger frame 12.
- the hanger frame 12 is inverted U-shaped, which forms a containing space 120, and has two lateral boards 121 and 122 facing each other.
- the two lateral boards 121 and 122 have two shaft holes 123 and 124 respectively at two corresponding positions.
- the lateral board 121 has a first stop portion 125 formed thereon; in the preferred embodiment, the lateral board 121 has two first stop portions 125, wherein the connecting line between the two first stop portions 125 passes through the shaft hole 123.
- the two first stop portions 125 are protrusions protruded from the lateral board 121 toward the containing space 120.
- the hanging ring 14 is adapted to be hung on or fixed to a firm support, such as a cable or a beam column.
- Two ends of the shaft lever 20 are respectively engaged in and fixed to the two shaft holes 123, 124.
- the outer surface near one of the two ends has a groove 22, wherein an extending direction of the groove 22 is parallel to an axial direction of the shaft lever 20.
- the groove 22 is adapted to be engaged with an end of the spiral spring 80 to prevent the shaft lever 20 form rotating relative to the frame 10.
- the retard member 30 is pivotally provided on the shaft lever 20 rotatably, and is received in the containing space 120.
- the retard member 30 has a friction surface 31; in the preferred embodiment, the retard member 30 has a plurality of ribs 32 separately arranged on the outer surface thereof, wherein a top surface of each of the ribs 32 forms the friction surface 31.
- a plurality of screw holes 33 are provided on an end surface of the retard member 30.
- the rotary drum 40 is fitted around the retard member 30, and includes a disc base 42, a sleeve 44, and a collar 46.
- the disc base 42 has four symmetrically arranged positioning holes 420.
- the sleeve 44 is connected to a side of the disc base 42, and has an inner surface 440 facing to the friction surface 31 of the retard member 30.
- the collar 46 is provided around the sleeve 44, and has an outer surface 460 and a gap 462. As shown in FIG. 5 , in the preferred embodiment, an end of the safety belt 200 is caught between the sleeve 44 and the collar 46; another portion of the safety belt 200 is stretched out from the gap 462, and then winded around the outer surface 460 of the collar 46.
- the rotary drum 40 merely includes the disc base 42 and the sleeve 44, while the collar 46 is not necessarily provided.
- an outer surface of the sleeve 44 which is opposite to the inner surface 440, is adapted to be winded by the safety belt 200.
- the turntable 50 includes a main body 52 and a positioning member 54, wherein the main body 52 has a center hole 520; one end of the shaft lever 20 passes through the center hole 520 such that the main body 52 is pivotally provided on the shaft lever 20.
- the main body 52 is received in the containing space 120, and is provided on a side of the rotary drum 40.
- a plurality of through holes 530 is provided around the center hole 520; the main body 52 has two pivot columns 521 and two restrict columns 522 provided on a lateral surface thereon.
- the positioning member 54 is connected to a side of the main body 52, and has a center hole 540 and a plurality of through holes 550, wherein one end of the shaft lever 20 passes through the center hole 540 such that the positioning member 54 is pivotally provided on the shaft lever 20 . Additionally, a plurality of bolts 300 respectively pass through corresponding through holes 550 of the positioning member 54, the through holes 530 of the main body 52, and afterward are threaded into corresponding screw holes 33 of the retard member 30. Accordingly, the positioning member 54, the main body 52, and the retard member 30 are fixed together, and are able to rotate coaxially (or synchronously). In addition, in another embodiment, the main body 52 and the positioning member 54 are integrated.
- the fall protection device 100 includes two brake assemblies 60; for the explanatory purpose, the structure of one of the two brake assemblies 60 is specified as follows.
- the brake assembly 60 includes a brake part 62 and a return spring 64, wherein the brake part 62 has a pivot hole 620, the brake part 62 is fitted with the pivot columns 521 by the pivot hole 620 thereof to be pivotally connected to the turntable 50.
- the return spring 64 is connected to the brake part 62 and the positioning member 54 with two ends thereof respectively. In the sense, the return spring 64 provides an elasticity to position the brake part 62 in a retracted position; in other words, the brake part 62 is pulled by the return spring 64 to be positioned in contact with the restrict columns 522 rather than contacting with the frame 10.
- the side cover 70 is received in the containing space 120, and is connected to the rotary drum 40 to rotate with the rotary drum 40 coaxially.
- the side cover 70 includes a first cover 72 and a second cover 74.
- the first cover 72 has a center hole 720, and a plurality of protrusions 721 are provided on a surface which faces to the rotary drum 40, wherein the protrusions 721 are adapted to be correspondingly engaged with the positioning holes 420 of the disc base 42, which makes the side cover 70 and the rotary drum 40 fixed together and rotate synchronously.
- a plurality of engaging holes 722 are provided on the outer peripheral surface of the first cover 72, while the second cover 74 has a center hole 740 and a plurality of protrusions 741 provided on the outer peripheral surface of the second cover 74, wherein the protrusions 741 are adapted to be correspondingly engaged with the engaging holes 722, which forms a space between the first cover 72 and the second cover 74 to contain the spiral spring 80.
- An end 82 of the spiral spring 80 is engaged with the groove 22 of the shaft lever 20, while another end 84 is fixed to the second cover 74.
- a plurality of protrusions 742 are projected from the inner surface of the second cover 74, and are separately arranged, wherein the end 84 of the spiral spring is fixed between two adjacent protrusions 742.
- a first operating state is defined when a worker is working stably, such as walking on a working platform or a pallet.
- the brake assembly 60 is kept in the retracted position without contacting with the first stop portion 125 of the frame 10, and accordingly the turntable 50 and the retard member 30 can coaxially (or synchronously) rotate with the rotary drum 40 and the side cover 70.
- the spiral spring 80 would be stretched along with the drawing of the safety belt 200, because the end 84 of the spiral spring 80 is fixed to the side cover 70. Therefore, the spiral spring 80 would store a restoring force (or so-called elasticity).
- the force to draw the safety belt 200 is smaller than the elasticity of the spiral spring 80, and therefore the spiral spring 80 would be elastically restored to a coil, which drives the safety belt 200 to wind around the rotary drum 40.
- a second operating state is defined when the safety belt 200 is suddenly stretched, e.g., when the worker tied with the safety belt 200 falls from high altitude.
- the brake part 62 is swung by a torque or a centrifugal force against to the elastic force of the return spring 64, wherein the pivot columns 521 is the fulcrum, to be engaged with the first stop portion 125 of the hanger frame 12 with a first portion 621 thereof, while a second portion 622 of the brake part 62 abuts against a second stop portion 541 of the positioning member 54.
- the turntable 50 is fixed by the engagement of the brake assembly 60 and the hanger frame 12, and the retard member 30 is fixed as well.
- the rotary drum 40 is continuously rotating due to the stretching of the safety belt 200 afterwards, and a rotational friction is generated between the friction surface 31 of the retard member 30 and the inner surface 440 of the rotary drum 40 when the rotary drum 40 is rotating relative to the retard member 30, which slows down the rotational speed of the rotary drum 40 and the fall speed of the safety belt and the worker.
- a fit tolerance between the inner surface 440 of the rotary drum 40 and the friction surface 31 of the retard member 30 is between 0 mm and 0.3 mm, in other words, the absolute value of the shortest distance between the inner surface 440 and the friction surface 31 is between 0 mm and 0.3 mm.
- Said fit tolerance is selected by the bearing capacity of the fall protection device 100 and the body weight of the worker.
- the fitting of the inner surface 440 of the rotary drum 40 and the friction surface 31 of the retard member 30 can be press fit including clearance fit, transition fit, or interference fit according to the demand for the use or the material properties of the fall protection device 100.
- the protrusions 742 can not only lighten the weight of the side cover 70 under enough structural strength but also retain foreign objects with interstices among the protrusions 742 without influencing the moving of the spiral spring.
- the fall protection device may include one or more than two brake assemblies 60.
- the fall protection device 100 is adapted not only to a worker but also to objects such as construction materials and machinery to slow down the fall speed of the objects.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Emergency Lowering Means (AREA)
Description
- The present invention relates generally to a safety device, and more particularly to a fall protection device suitable for high altitude environments.
- Generally, workers are requested to be equipped with fall protection equipment while working in high altitude environments such as a rooftop, factory, elevator, shipbuilding yard, aerospace site, and construction site, wherein a commonly seen fall protection equipment usually includes a safety belt which ties a worker securely. Whereby, if a worker accidentally falls from high altitude, the fall protection equipment can instantly lock the safety belt or decelerate the fall to prevent the worker from continuously falling, or to slow down the fall speed, which ensures the worker's safety.
- One type of the fall protection equipment available in the market is designed to include an elastic safety belt, which is helpful to decelerate the fall when a worker tied with the safety belt falls. However, the length and the elastic coefficient of such safety belt have to be taken into consideration according to the altitude of the working environments and the body weight of the worker; otherwise the safety belt may fail to rebound in time before the worker falling to the ground.
- Moreover, another type of the fall protection equipment is specifically designed that the safety belt thereof has a stitched folded section. Whereby, when a worker tied with the safety belt falls, the stitched folded section would be torn apart to absorb part of the falling energy to decelerate the fall. However, such design would damage the structure of the safety belt, which may decrease the strength and the bearing capacity and, therefore, may be potentially dangerous.
- In addition, yet another type of fall protection equipment can instantly lock the safety belt when a worker attached thereto falls, to prevent the worker from continuously falling. Though such design could stop the fall, the sudden impact (e.g., G-Force) and the reaction force generated at the very moment that the fall protection equipment locks the safety belt may cause internal injuries or even break bones. In this sense, the conventional fall protection equipment still has room for improvement.
US2009084631 discloses a retractable lifeline assembly with a brake assembly where a friction disk is provided to slow down the rate of fall. It is mechanically complex, so it can be improved further. - In view of the above, the primary objective of the present invention is to provide a fall protection device for preventing workers from falling from high altitude.
- The present invention provides a fall protection device, which is adapted to be connected to a safety belt, including a frame, a shaft lever, a retard member, and a rotary drum. The frame forms a containing space; the shaft lever is provided on the frame. The retard member is pivotally provided on the shaft lever rotatably, wherein the retard member is received in the containing space, and has a friction surface. The rotary drum is fitted around the retard member, wherein the rotary drum has an outer surface and an inner surface; the outer surface is adapted to be winded by the safety belt, and the inner surface faces to the friction surface of the retard member. In a first operating state, the retard member and the rotary drum rotate coaxially; in a second operating state, when the safety belt is suddenly stretched, the retard member is fixed, while the rotary drum rotates relative to the retard member, wherein a rotational friction is generated between the friction surface of the retard member and the inner surface of the rotary drum, which slows down the rotational speed of the rotary drum.
- Whereby, with the design of the fitting between the friction surface of the retard member and the inner surface of the rotary drum, in the first operating state, the normal use state, the retard member, retard member would not affect the rotation of the rotary drum. If the worker accidentally falls from high altitude and accordingly in the second operating state, the rotational friction would be generated between the retard member and the rotary drum, which reduces the rotational speed of the rotary drum. Whereby, the fall speed of the safety belt would be lowered.
- The present invention will be best understood by referring to the following detailed description of some illustrative embodiments in conjunction with the accompanying drawings, in which
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FIG. 1 is a perspective view of a preferred embodiment of the present invention, showing the fall protection device for preventing workers from falling; -
FIG. 2 is a exploded view of the fall protection device inFIG. 1 ; -
FIG. 3 is a lateral perspective view of the fall protection device inFIG. 1 , showing the brake assembly positioned without contacting with the frame; -
FIG. 4 is a lateral perspective view of the fall protection device inFIG. 1 , showing the brake assembly swung by the torque; the brake part is engaged with the first stop portion of the frame; and -
FIG. 5 is a sectional view along the 5-5 line inFIG. 1 . - As shown in
FIG. 1 andFIG. 2 , afall protection device 100 is adapted to be connected to asafety belt 200, which is used to tie a worker securely. Thefall protection device 100 includes aframe 10, ashaft lever 20, aretard member 30, arotary drum 40, aturntable 50, abrake assembly 60, aside cover 70, and aspiral spring 80. - The
frame 10 includes ahanger frame 12 and a hangingring 14 connected to the top of thehanger frame 12. Thehanger frame 12 is inverted U-shaped, which forms a containingspace 120, and has twolateral boards lateral boards shaft holes lateral board 121 has afirst stop portion 125 formed thereon; in the preferred embodiment, thelateral board 121 has twofirst stop portions 125, wherein the connecting line between the twofirst stop portions 125 passes through theshaft hole 123. The twofirst stop portions 125 are protrusions protruded from thelateral board 121 toward the containingspace 120. The hangingring 14 is adapted to be hung on or fixed to a firm support, such as a cable or a beam column. - Two ends of the
shaft lever 20 are respectively engaged in and fixed to the twoshaft holes groove 22, wherein an extending direction of thegroove 22 is parallel to an axial direction of theshaft lever 20. Thegroove 22 is adapted to be engaged with an end of thespiral spring 80 to prevent theshaft lever 20 form rotating relative to theframe 10. - The
retard member 30 is pivotally provided on theshaft lever 20 rotatably, and is received in the containingspace 120. Theretard member 30 has afriction surface 31; in the preferred embodiment, theretard member 30 has a plurality of ribs 32 separately arranged on the outer surface thereof, wherein a top surface of each of the ribs 32 forms thefriction surface 31. In addition, a plurality of screw holes 33 are provided on an end surface of theretard member 30. - The
rotary drum 40 is fitted around theretard member 30, and includes adisc base 42, asleeve 44, and acollar 46. Thedisc base 42 has four symmetrically arrangedpositioning holes 420. Thesleeve 44 is connected to a side of thedisc base 42, and has aninner surface 440 facing to thefriction surface 31 of theretard member 30. Thecollar 46 is provided around thesleeve 44, and has anouter surface 460 and agap 462. As shown inFIG. 5 , in the preferred embodiment, an end of thesafety belt 200 is caught between thesleeve 44 and thecollar 46; another portion of thesafety belt 200 is stretched out from thegap 462, and then winded around theouter surface 460 of thecollar 46. However, in another embodiment, therotary drum 40 merely includes thedisc base 42 and thesleeve 44, while thecollar 46 is not necessarily provided. With such design, an outer surface of thesleeve 44, which is opposite to theinner surface 440, is adapted to be winded by thesafety belt 200. - The
turntable 50 includes amain body 52 and apositioning member 54, wherein themain body 52 has acenter hole 520; one end of theshaft lever 20 passes through thecenter hole 520 such that themain body 52 is pivotally provided on theshaft lever 20. Themain body 52 is received in the containingspace 120, and is provided on a side of therotary drum 40. Moreover, a plurality of throughholes 530 is provided around thecenter hole 520; themain body 52 has twopivot columns 521 and tworestrict columns 522 provided on a lateral surface thereon. Thepositioning member 54 is connected to a side of themain body 52, and has acenter hole 540 and a plurality of throughholes 550, wherein one end of theshaft lever 20 passes through thecenter hole 540 such that thepositioning member 54 is pivotally provided on theshaft lever 20 . Additionally, a plurality ofbolts 300 respectively pass through corresponding throughholes 550 of thepositioning member 54, the throughholes 530 of themain body 52, and afterward are threaded into corresponding screw holes 33 of theretard member 30. Accordingly, thepositioning member 54, themain body 52, and theretard member 30 are fixed together, and are able to rotate coaxially (or synchronously). In addition, in another embodiment, themain body 52 and thepositioning member 54 are integrated. - As illustrated in
FIG. 2 andFIG. 3 , in the preferred embodiment, thefall protection device 100 includes twobrake assemblies 60; for the explanatory purpose, the structure of one of the twobrake assemblies 60 is specified as follows. Thebrake assembly 60 includes abrake part 62 and areturn spring 64, wherein thebrake part 62 has apivot hole 620, thebrake part 62 is fitted with thepivot columns 521 by thepivot hole 620 thereof to be pivotally connected to theturntable 50. Thereturn spring 64 is connected to thebrake part 62 and the positioningmember 54 with two ends thereof respectively. In the sense, thereturn spring 64 provides an elasticity to position thebrake part 62 in a retracted position; in other words, thebrake part 62 is pulled by thereturn spring 64 to be positioned in contact with the restrictcolumns 522 rather than contacting with theframe 10. - The side cover 70 is received in the containing
space 120, and is connected to therotary drum 40 to rotate with therotary drum 40 coaxially. In the preferred embodiment, theside cover 70 includes afirst cover 72 and asecond cover 74. Thefirst cover 72 has acenter hole 720, and a plurality ofprotrusions 721 are provided on a surface which faces to therotary drum 40, wherein theprotrusions 721 are adapted to be correspondingly engaged with the positioning holes 420 of thedisc base 42, which makes theside cover 70 and therotary drum 40 fixed together and rotate synchronously. Moreover, a plurality of engagingholes 722 are provided on the outer peripheral surface of thefirst cover 72, while thesecond cover 74 has acenter hole 740 and a plurality ofprotrusions 741 provided on the outer peripheral surface of thesecond cover 74, wherein theprotrusions 741 are adapted to be correspondingly engaged with the engagingholes 722, which forms a space between thefirst cover 72 and thesecond cover 74 to contain thespiral spring 80. - An
end 82 of thespiral spring 80 is engaged with thegroove 22 of theshaft lever 20, while anotherend 84 is fixed to thesecond cover 74. In the preferred embodiment, a plurality ofprotrusions 742 are projected from the inner surface of thesecond cover 74, and are separately arranged, wherein theend 84 of the spiral spring is fixed between twoadjacent protrusions 742. - A first operating state is defined when a worker is working stably, such as walking on a working platform or a pallet. In said first operating state, the
brake assembly 60 is kept in the retracted position without contacting with thefirst stop portion 125 of theframe 10, and accordingly theturntable 50 and theretard member 30 can coaxially (or synchronously) rotate with therotary drum 40 and theside cover 70. In addition, when the worker tied with thesafety belt 200 is away from thefall protection device 100, which draws thesafety belt 200, thespiral spring 80 would be stretched along with the drawing of thesafety belt 200, because theend 84 of thespiral spring 80 is fixed to theside cover 70. Therefore, thespiral spring 80 would store a restoring force (or so-called elasticity). On the other hand, when the worker is close to thefall protection device 100, the force to draw thesafety belt 200 is smaller than the elasticity of thespiral spring 80, and therefore thespiral spring 80 would be elastically restored to a coil, which drives thesafety belt 200 to wind around therotary drum 40. - In contrast, a second operating state is defined when the
safety belt 200 is suddenly stretched, e.g., when the worker tied with thesafety belt 200 falls from high altitude. As shown inFIG. 3 to FIG. 5 , thebrake part 62 is swung by a torque or a centrifugal force against to the elastic force of thereturn spring 64, wherein thepivot columns 521 is the fulcrum, to be engaged with thefirst stop portion 125 of thehanger frame 12 with a first portion 621 thereof, while asecond portion 622 of thebrake part 62 abuts against asecond stop portion 541 of the positioningmember 54. In this sense, theturntable 50 is fixed by the engagement of thebrake assembly 60 and thehanger frame 12, and theretard member 30 is fixed as well. Therotary drum 40 is continuously rotating due to the stretching of thesafety belt 200 afterwards, and a rotational friction is generated between thefriction surface 31 of theretard member 30 and theinner surface 440 of therotary drum 40 when therotary drum 40 is rotating relative to theretard member 30, which slows down the rotational speed of therotary drum 40 and the fall speed of the safety belt and the worker. - In addition, to effectively slow down the rotational speed of the
rotary drum 40 and the fall speed of the safety belt and the worker, a fit tolerance between theinner surface 440 of therotary drum 40 and thefriction surface 31 of theretard member 30 is between 0 mm and 0.3 mm, in other words, the absolute value of the shortest distance between theinner surface 440 and thefriction surface 31 is between 0 mm and 0.3 mm. Said fit tolerance is selected by the bearing capacity of thefall protection device 100 and the body weight of the worker. - In another embodiment, the fitting of the
inner surface 440 of therotary drum 40 and thefriction surface 31 of theretard member 30 can be press fit including clearance fit, transition fit, or interference fit according to the demand for the use or the material properties of thefall protection device 100. - Additionally, the
protrusions 742 can not only lighten the weight of theside cover 70 under enough structural strength but also retain foreign objects with interstices among theprotrusions 742 without influencing the moving of the spiral spring. - Moreover, in other embodiments, the fall protection device may include one or more than two
brake assemblies 60. - It is noted that the
fall protection device 100 is adapted not only to a worker but also to objects such as construction materials and machinery to slow down the fall speed of the objects. - It must be pointed out that the embodiments described above are only some preferred embodiments of the present invention.
Claims (12)
- A fall protection device (100), which is adapted to be connected to a safety belt (200), comprising:a frame (10) forming a containing space (120);a shaft lever (20) provided on the frame (10);a retard member (30) pivotally provided on the shaft lever (20) rotatably, wherein the retard member (30) is received in the containing space (120), and has a friction surface (31); anda rotary drum (40) fitted around the retard member (30), wherein the rotary drum (40) has an outer surface (460) and an inner surface (440); the outer surface (460) is adapted to be winded by the safety belt (200), and the inner surface (440) faces to the friction surface (31) of the retard member (30);wherein, in a first operating state, the retard member (30) and the rotary drum (40) rotate coaxially; in a second operating state, when the safety belt (200) is suddenly stretched, the retard member (30) is fixed, while the rotary drum (40) rotates relative to the retard member (30), wherein a rotational friction is generated between the friction surface (31) of the retard member (30) and the inner surface (440) of the rotary drum (40), which slows down the rotational speed of the rotary drum (40).
- The fall protection device (100) of claim 1, wherein a fit tolerance between the inner surface (440) of the rotary drum (40) and the friction surface (31) of the retard member (30) is between 0 mm and 0.3 mm.
- The fall protection device (100) of claim 1, wherein the retard member (30) is press fitted into the rotary drum (40).
- The fall protection device (100) of claim 1, wherein the retard member (30) has a plurality of ribs (32) separately arranged, wherein an extension direction of each of the plurality of ribs (32) is parallel to an axial direction of the shaft lever (20), and a top surface of each of the ribs forms the friction surface (31).
- The fall protection device (100) of claim 2, wherein the retard member (30) has a plurality of ribs (32) separately arranged, wherein an extension direction of each of the plurality of ribs (32) is parallel to an axial direction of the shaft lever (20), and a top surface of each of the ribs (32) forms the friction surface (31).
- The fall protection device (100) of claim 3, wherein the retard member (30) has a plurality of ribs (32) separately arranged, wherein an extension direction of each of the plurality of ribs (32) is parallel to an axial direction of the shaft lever (20), and a top surface of each of the ribs (32) forms the friction surface (31).
- The fall protection device (100) of claim 1, further comprising a turntable (50) and a brake assembly (60), wherein the turntable (50) is pivotally provided on the shaft lever (20), and is connected to the retard member (30); the brake assembly (60) comprises a brake part (62) and a return spring (64), wherein the brake part (62) is pivotally connected to the turntable (50), and the return spring (64) is connected to the brake part (62) and the turntable (50) with two ends thereof respectively; wherein, in the first operating state, the brake part (62) is pulled by the return spring (64) to be positioned without contacting with the frame (10); in the second operating state, the brake part (62) is swung to be engaged with the frame (10) by a torque against to an elastic force of the return spring (64), which fixes the turntable (50) and the retard member (30).
- The fall protection device (100) of claim 7, wherein the frame (10) has a first stop portion (125); in the second operating state, a first portion of the brake part (62) abuts against the first stop portion (125).
- The fall protection device (100) of claim 8, wherein the turntable (50) has a second stop portion (541); in the second operating state, a second portion (622) of the brake part (62) abuts against the second stop portion (541).
- The fall protection device (100) of claim 1, further comprising a lateral cover (70) and a spiral spring (80), wherein the lateral cover (70) is received in the containing space (120), and is connected to the rotary drum (40); the lateral cover (70) and the rotary drum (40) rotate coaxially; the spiral spring (80) is provided between the lateral cover (70) and the rotary drum (40), and is fixed to the shaft lever (20) and the lateral cover (70) with two ends (82, 84) thereof respectively; the spiral spring (80) is adapted to provide the rotary drum (40) a restoring force to rewind the safety belt (200).
- The fall protection device (100) of claim 10, wherein the shaft lever (20) has a groove (22) recessed into an outer surface thereof, and an extending direction of the groove is parallel to an axial direction of the shaft lever (20); one of the two ends (82) of the spiral spring is engaged with the groove (22).
- The fall protection device (100) of claim 10, wherein a plurality of protrusions (721) are projected from an inner surface of the lateral cover (70), and are separately arranged; one of the two ends (84) of the spiral spring (80) is fixed between two adjacent protrusions (721) among the plurality of protrusions (721).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES16182127T ES2719679T3 (en) | 2016-08-01 | 2016-08-01 | Fall protection device |
EP16182127.7A EP3278840B1 (en) | 2016-08-01 | 2016-08-01 | Fall protection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16182127.7A EP3278840B1 (en) | 2016-08-01 | 2016-08-01 | Fall protection device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3278840A1 EP3278840A1 (en) | 2018-02-07 |
EP3278840B1 true EP3278840B1 (en) | 2019-03-13 |
Family
ID=56561256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16182127.7A Active EP3278840B1 (en) | 2016-08-01 | 2016-08-01 | Fall protection device |
Country Status (2)
Country | Link |
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EP (1) | EP3278840B1 (en) |
ES (1) | ES2719679T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3939670A1 (en) | 2020-07-13 | 2022-01-19 | Tractel Greifzug GmbH | Fall arrest device |
US20220161072A1 (en) * | 2020-11-23 | 2022-05-26 | Yoke Industrial Corp. | Fall arrester |
FR3139727A1 (en) * | 2022-09-19 | 2024-03-22 | Zedel | DEVICE FOR DETECTING A THRESHOLD SPEED OF A BLOCKING DEVICE, BLOCKING DEVICE AND METHOD FOR BLOCKING A WIRED ELEMENT |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2468511Y (en) * | 1989-10-07 | 2002-01-02 | 苏正万 | Mechanically operated type device for person rescuing from high building |
US20050023085A1 (en) * | 2003-07-30 | 2005-02-03 | Munton Timothy John | Lifesaver apparatus |
WO2008008225A2 (en) * | 2006-07-10 | 2008-01-17 | Sigma Industries, Llc | Retractable lifeline safety device |
US8893854B2 (en) * | 2007-09-28 | 2014-11-25 | D B Industries, Llc | Retractable lifeline assembly |
-
2016
- 2016-08-01 ES ES16182127T patent/ES2719679T3/en active Active
- 2016-08-01 EP EP16182127.7A patent/EP3278840B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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EP3278840A1 (en) | 2018-02-07 |
ES2719679T3 (en) | 2019-07-12 |
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