EP3574958B1

EP3574958B1 - Device for automatic lowering after a fall arrest at height

Info

Publication number: EP3574958B1
Application number: EP19174457.2A
Authority: EP
Inventors: Jacek Sordyl
Original assignee: Cbr Rock Master Sp Z OO Sp K
Current assignee: Cbr Rock Master Sp Z OO Sp K
Priority date: 2018-05-28
Filing date: 2019-05-14
Publication date: 2023-08-23
Anticipated expiration: 2039-05-14
Also published as: PL425749A1; PL240122B1; PL3574958T3; EP3574958A1

Description

The subject of the invention is a device for automatic lowering after fall arrest at height, used especially as a personal protective equipment by workers working at height.
Various types of rope arrays with braking blocks and friction brakes are known in the high altitude rescue operations. Such systems necessitate intervention of third parties, they are additionally complemented with air cushions, platforms, mats, etc. Automatic rescue braking devices known from Polish patent application No. 212484 filed in 28.08.2006 , comprises internal load-carrying structure and external C-beam tilting housing, rotary connected with each other via a transverse axle. In the internal load-carrying structure a pressing lever is pivotably located on a top axle that act, via a load-carrying lever, on a face plate controlling the motion of a rescue tape within a guide formed by the internal wall of the external C-beam tilting housing and the face plate surface. The side walls of the external C-beam tilting housing is fitted with notches on both sides receiving the top axle and bottom axle with a grip equipped with a return spring cooperating with the other end of the bottom axle. Middle axle with the load-carrying lever installed is located between the top axle and the bottom axle of the internal load-carrying housing. The pressing lever has two projections that are rectangular and oriented inwards and being in contact at top edges with notches made in the load-carrying lever that control the degree of pressure on the rescue tape. During the first stage of self-evacuation directed vertically downwards, the device allows for using the force of gravity that unlocks the pressure lever locked on the rescue tape at the moment of a jump and while unlocked, it allows lowering down the rescue tape in a way that limits the lowering speed to a safe level.
Polish patent application P.408397 filed in 2 June 2014 discloses a device for automatic lowering after a fall arrest that consists of a body with fixed elements for components, axles wherein one of them is fitted with a rope drum with a wound rope and a rack and the other with a centrifugal and disk brake with a rack. The racks represent a transmission from the drum to brake system that cooperates with a control system consisting of a dispenser with a control rope and a flap. The dispenser has a double bottom with extension spring. The whole is coupled with an electrical system supplied from a power pack and coupling pin connected via a terminal switch transmitting an electrical system to an electronic system being a time delay actuating an electro-bolt upon a set time delay. The power pack is supplied from the power supply network or a battery-accumulator system. The load-carrying elements are fitted with a catch used to suspend the device to an anchoring point over a place of work. Rope or tape wound on the rope drum can be wound or unwound using a spring in normal mode of operation, however during a fall, drum rotation is stopped and the device switches to an emergency mode with an ejection of a control rope. Pulling the ejected control rope releases the disk brake calliper and the process of lowering at speed controlled by the centrifugal brake starts.
US Patent application no. US2010224448A1 discloses a safety device with fall arrest and descending modes includes a housing, a drum, a lifeline, first and second brake assemblies, and a control. The drum is rotatably operatively connected to the housing. The lifeline has an intermediate portion interconnecting a first end and a second end. The first end is operatively connected to the drum. The first and second assemblies are operatively connected to the drum. The control is operatively connected to the first and second brake assemblies and has a first position and a second position. The first position selectively engages the first brake assembly in a descending mode and the second position selectively engages the second brake assembly in a fall arrest mode.
International patent application no. WO2013014453A2 discloses a height rescue apparatus comprising a safety line which is attached to a flexible elongate element which has a lower tensile strength than the safety line which is wound on a drum which is part of a speed control means. A friction device acts on a portion of the safety line to reduce tension in said portion of the safety line by at least 50% in a full arrest situation. The drum or the speed control means is held in a first position which prevents rotation of the drum and release means can be actuated after the fall arrest to allow the drum to provide a controlled lowering action.
There are self-braking devices known in the art and used as fall arrest systems wherein the acceleration of unwinding of the rope wound on the drum causes it to stop and therefore the fall to arrest. Rescue procedure consists in time-consuming approach to a person suspended on a locked device, its reception and safe lowering.
The object of the invention it to provide a device for automatic lowering after a fall arrest that eliminates drawbacks of known solutions. Moreover the objective of the invention is to allow immediate rescue operations in a situation after a fall arrest at height without taking an excessive risk by a rescuer.
The above is achieved by a device for automatic lowering after a fall arrest at height that was made in manual and remote version. Device for automatic lowering after a fall arrest at height includes a body with fixed load-carrying elements for components, rotary rope drum with self-braking mechanism, wherein a supporting element of a ratchet elements of the rope drum is located on an axle in a gear locked by means of a gear lock located on an axle with an arm held by a clamp consisting of two parts, fixed support part with absorbing cushion as well as pressure and rotary part with absorbing cushion locked with a tilting bolt connected with a lock release coupled with a control module. In a manual version, the control module consists of a control rope dispenser having a double bottom with a spring, closed with a flap and secured with an electro-lock being a part of a control system coupled with an electrical system that includes a top catch equipped with a terminal switch closing an electrical circuit connecting a supply source with an electronic system, being a time delay actuating the electro-lock of the flap of the control lock. In the remotely controlled version, the control module is equipped with a wireless receiver coupled with an electrical system consisting of a top catch equipped with a terminal switch closing the electrical circuit between a supply source and an electronic system being a time delay for the lock release. The used time delay is necessary to differentiate between a situation of accidental loading the device and actual life threatening situation. Long-term, for example 40 second, loading of the device in case of a fall arrest at height results in switching the device from stand-by mode to rescue mode. Safe lowering of a person endangered to fall at height is possible already within the first minute from the occurrence of a dangerous situation.
The invention is presented in embodiments on the drawing, wherein, fig. 1 presents an axonometric view of the device, whereas fig. 2 presents cross-section of the device in manual version, and fig. 3 presents a variant with remote control.
The device for automatic lowering after a fall arrest will be described in two embodiments.
According to the first embodiment, the device consists of a body with load-carrying elements for components 1, wherein on a first axle 2 is located a return spring 3, rope drum 4 with ratchet elements 5 and locked gear 6 with supporting elements 7 for rotary ratchet elements 5 of the rope drum 4. Rope or tape 8 wound on the drum 4 can freely wind or unwind by means of a spring 3 during slow rotation of the drum 4 in normal operation mode. On a second axle 9 is located a gear lock 10 with locked arm in a clamp consisting of a fixed support part 11 with absorbing cushion 12 and the other pressure and rotary part 13 also with absorbing cushion 14 locked from the top by means of a bolt 15 connected with a lock release 16 coupled with a control module 17. On a third axle 18 is located a rack 19 that represents transmission of rotation from the gear 6 to the centrifugal brake 20 decelerating the lowering operation in a rescue mode after release of the lock 10. The control module 17 consists of a control rope 22 dispenser 21 having a double bottom with a spring. The control rope 22 wound in the dispenser 21 is closed with a flap secured with an electro-lock 23 that is a control system coupled with the electrical system. The electrical system includes the top catch 24 with a terminal switch 25 closing the electrical circuit between the supply source 26 and the electronic system being a time delay 27 actuating the electro-lock 23 of the flap of the control rope 22 after a set time delay by means of an electric pulse (for example 40 seconds after arresting fall at height). Electric pulse generated in the electro-lock 23 causes the flap to open and to eject the control rope 22. Pulling the ejected control rope 22 removes the lock from the gear 6 and the process of lowering at speed controlled by the centrifugal brake 20 starts.
According to the second embodiment, the control module 17 is equipped with wireless receiver 28 coupled with the electrical system consisting of the top catch 24 with a terminal switch 25 closing the electrical circuit between the supply source 26 and the electronic system being the time delay 27 allowing for switching from the stand-by mode to rescue mode after a set time delay by transmitting an electric voltage from the transmitter to the control receiver 28.
At the moment the device switches to the rescue mode, it is ready to receive a remote signal from the transmitter held by a person assisting and supervising the works, causing immediate reaction of the lock release 16 causing the bolt 15 to tilt and releasing the arm of the lock 10 from clamp parts 11 and 13 in order to allow automatic lowering of a sufferer with controlled speed using the centrifugal brake 20.

Claims

A device for automatic lowering after a fall arrest at height equipped with a body with load-carrying elements for components, rotary rope drum with self-braking mechanism comprising supporting element (7), ratchet elements (5), rope drum (4), gear (6) with teeth located around the perimeter of the gear (6), gear lock (10) and rack (19) located on axle (18) having teeth engaged with teeth of the gear (6), wherein the self-braking mechanism is rotatable around an axle on the body, characterized in that the supporting element (7) for the ratchet elements (5) of the rope drum (4) is located on first axle (2) in the gear (6) locked by means of a gear lock (10),
wherein the ratchet elements (5) are rotatably connected to the rope drum (4),

wherein the first axle (2) is connected to the body and provides free rotating movement of the rope drum (4) with ratchet elements (5) and free rotating movement of the supporting element (7) connected with the gear (6) on the same first axle (2),

wherein after engaging the ratchet elements (5) with the supporting element (7) the rope drum (4) is rotatable around the first axle (2) together with the gear (6),

wherein the gear lock (10) is located on second axle (9) connected to the body,

wherein in a locked state after the fall arrest, an arm of the gear lock (10) is locked by holding it by a clamp consisting of two parts, fixed support part (11) with absorbing cushion (12) contacting the first side of the arm of the gear lock (10), as well as pressure and rotary part (13) with absorbing cushion (14) contacting the second, opposite side of the arm of the gear lock (10),

wherein the gear lock (10) is coupled with the gear (6) by engaging the teeth of the gear lock (10) with teeth of the gear (6),

wherein the pressure and rotary part (13) is located on third axle connected to the body and providing free pivoting movement of the pressure and rotary part (13),

wherein the pressure and rotary part (13) is connected with a first end of a tilting bolt (15) located on fourth axle connected to the body,

wherein a second end of the tilting bolt (15) is connected with a lock release (16) coupled with a control module (17),

wherein the lock release (16) has a locked state and an unlocked state,

wherein in the locked state triggered by the control module (17) the lock release (16) through the tilting bolt (15) holds the pressure and rotary part (13) in the locked position in which the absorbing cushion (14) contacting and holding the second side of the arm of the gear lock (10) in a coupled state with the gear (6), and

wherein in the unlocked state triggered by the control module (17) after a remote signal from the transmitter is received, the lock release (16) releases the pressure and rotary part (13) from the locked position, through pivoting the tilting bolt (15), unlocking the arm of the gear lock (10) and allowing the gear lock (10) to rotate in order to uncoupling from the gear (6),

wherein all axles are parallel.
The device according to claim 1 characterized in that the control module (17) consists of a control rope (22) dispenser (21) having a double bottom with a spring, closed with a flap and secured with an electro-lock (23) being a part of the control system coupled with an electrical system that includes a top catch (24) equipped with a terminal switch (25) closing an electrical circuit connecting a supply source (26) with an electronic system, being a time delay (27) actuating the electro-lock (23) of the flap of the control rope (22).
The device according to claim 1 characterized in that the control module (17) is equipped with a wireless receiver (27) coupled with an electrical system consisting of a top catch (24) equipped with a terminal switch (25) closing the electrical circuit between a supply source (26) and an electronic system being a time delay (27) for the lock release (16).