GB2543699A - Rope safety device - Google Patents
Rope safety device Download PDFInfo
- Publication number
- GB2543699A GB2543699A GB1702088.4A GB201702088A GB2543699A GB 2543699 A GB2543699 A GB 2543699A GB 201702088 A GB201702088 A GB 201702088A GB 2543699 A GB2543699 A GB 2543699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- attachment aperture
- plastically deformable
- deformable portion
- attachment
- slots
- 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.)
- Granted
Links
Classifications
-
- 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
- A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means
Abstract
A rope safety device comprises a body 1 having an attachment aperture 2 (for connecting the device to an anchor point or harness) and a plastically deformable portion associated with the said attachment aperture, adapted to deform when the load applied to the attachment aperture exceeds a predetermined minimum. The plastically deformable portion comprises a region of the body extending between the attachment aperture and one or more further apertures or slots 3, 4 formed in the body adjacent the attachment aperture and arranged concentrically with the attachment aperture to facilitate progressive deformation of said plastically deformable portion in a controlled direction.
Description
Rope Safety Device
This invention relates to a rope safety device for arresting the descent of a person or other load down a rope, lifeline, cable, web or other similar elongate load supporting member or line (collectively referred to hereinafter as" rope"), and in particular to a fall arrest device for arresting the descent of a person down a rope in the event of a fall.
Rope safety devices for fall protection and rescue are known, such devices operating on a rope, cord tape, web, rail or other elongate load supporting member (collectively referred to hereinafter as rope) and commonly incorporating an aperture for the attachment of a Karabiner or similar connector to connect the device to an anchor point or the user’s harness.
Such attachment aperture may be formed in the body of the device or may comprise an external ‘eye’ securedly affixed to the device. Some known devices include an external eye with a shear pin or similar such that the pin will fail when the load exceeds a certain threshold, allowing the attachment between the device and the eye to extend. This indicates if the device has been subject to a load but the extension of the attachment imparts a shock load to the device. Such eyes are also expensive and, being external to the device, increase its outside dimensions. Such indicators are advantageous as they clearly show if a device has been used under load, however they are currently so complicated that they are only fitted to large expensive items. Any shock load imparted to the device can have a detrimental effect. In addition, such indicators are not incremental and do not show that the load is increasing.
Shock absorbers which dampen the impact are common but these are large and, typically being textile, prone to damage. Deformable metal shock absorbers are known, but these are currently only used on devices which operate on a fixed rail. The rail, being fixed, prevents the device from moving during deployment ensuring that the metal absorber deploys correctly. If used in a system containing flexible rope the direction of deployment is not controlled and can as such vary and change the loading on the device itself. Such absorbers must by definition, have a low strength so that they can deform. Following deployment, this low tensile strength leaves a weak link in the system.
According to a first aspect of the present invention there is provided a rope safety device as claimed in claim 1.
In one embodiment, said plastically deformable portion comprises a region of said body extending between said attachment aperture and one or more further apertures or slots formed in said body adjacent said attachment aperture.
Said one or more further apertures or slots may be arranged concentrically with said attachment aperture.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which :-
Figure 1 is a side view of a rope safety device in accordance with a first embodiment of the present invention, before deformation; and
Figure 2 is a side view of the rope safety device of Figure 1, after deformation.
As shown in Figures 1 and 2, a rope safety device according to a first embodiment of the present invention comprises a body 1 supporting a device (not shown) for engaging a rope, the body 1 incorporating at least one attachment aperture 2.
Two concentric slots 3,4 are formed in the body in close proximity to the attachment aperture 2, arranged concentrically therewith. The regions of the body 1 between the attachment aperture 2 and slot 3,4 are plastically deformable whereby such regions will progressively deform when the load applied to the device via aperture 2 exceeds a predetermined threshold in the direction of said slots 3,4, such deformation serving to close slots 3,4, indicating visually that the load has exceeded the predetermined threshold and at the same time absorbing energy from a fall or impact. If the deformation reaches a point where said slots 3,4 are fully closed, a connector affixed to the attachment aperture 2 is in direct operative contact with the body 2 and further deformation is prevented. At this stage, further deformation cannot take place and thus there is no risk of failure of the connection aperture. This is an improvement over prior art attempts to provide deformable features associated with an attachment apertures, which tend to reduce the ultimate strength of the attachment by failing to delimit the deformation of the deformable feature.
The number of slots and/or the shape and/or the dimensions of the slots and/or spacing of the slots and/or the type of material between the attachment aperture 2 and the slots 3,4 may be varied such that the load at which deformation occurs may be increased or decreased as required and to allow the distance over which deformation occurs and as such the amount of energy absorption to be varied. Furthermore, the position and/or orientation of slots and the amount they extend around attachment aperture 2 may be varied so that the direction of deformation may be varied as required.
In an alternative embodiment, not shown, the body may comprise a support plate containing at least two attachment apertures, at least one of said apertures being associated with a plastically deformable portion as described in the first embodiment. Such support plate may be capable of being attached to a rope safety device, harness or similar via at least one attachment aperture.
The invention is not limited to the embodiment described herein but can be amended or modified without departing from the scope of the present invention as defined by the claims.
Claims (2)
- Claims
- 1. A rope safety device comprising a body having an attachment aperture for connecting the device to an anchor point or harness, said body incorporating a plastically deformable portion associated with said attachment aperture whereby said plastically deformable portion is adapted to deform when the load applied to the attachment aperture exceeds a predetermined minimum, wherein said plastically deformable portion comprises a region of said body extending between said attachment aperture and one or more further apertures or slots formed in said body adjacent said attachment aperture, said one or more further apertures or slots being arranged concentrically with said attachment aperture to facilitate progressive deformation of said plastically deformable portion in a controlled direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1702088.4A GB2543699B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1311100.0A GB2515341B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
| GB1702088.4A GB2543699B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201702088D0 GB201702088D0 (en) | 2017-03-22 |
| GB2543699A true GB2543699A (en) | 2017-04-26 |
| GB2543699B GB2543699B (en) | 2017-06-07 |
Family
ID=48950281
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1311100.0A Active GB2515341B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
| GB1702088.4A Active GB2543699B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1311100.0A Active GB2515341B (en) | 2013-06-21 | 2013-06-21 | Rope safety device |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB2515341B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2614135A (en) * | 2021-08-17 | 2023-06-28 | Sayfa R&D Pty Ltd | A fall arrest roof mount anchor |
| AU2021106324A4 (en) * | 2021-08-17 | 2021-11-04 | Sayfa R&D Pty Ltd | A fall arrest and rope access roof mount anchor |
| CA3221496A1 (en) * | 2022-03-16 | 2023-09-21 | Beaver Technology Services Pty Limited | Height safety davit with fail-safe mechanism |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2305230A (en) * | 1995-09-07 | 1997-04-02 | Barrow Hepburn Sala Ltd | Safety lifeline shock absorber |
| GB2334319A (en) * | 1998-01-09 | 1999-08-18 | Pavlos Yiannakopoulos | Multiple use energy absorption element |
| US20050012319A1 (en) * | 2003-07-14 | 2005-01-20 | Kurt Schulz | Load limiting structure for vehicle occupant restraint system |
| FR2920997A1 (en) * | 2007-09-19 | 2009-03-20 | Ajuva Safety Sarl | Potential and kinetic energy absorbing device for e.g. cable fixation stud, has male unit with teeth stopped and deformed against rim of opening for limiting or blocking relative sliding of male and female units subjected to traction force |
| DE202012010035U1 (en) * | 2011-10-20 | 2013-02-18 | Rodigas S.R.L. | Energy converter for safety lines and safety line with such a converter device |
-
2013
- 2013-06-21 GB GB1311100.0A patent/GB2515341B/en active Active
- 2013-06-21 GB GB1702088.4A patent/GB2543699B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2305230A (en) * | 1995-09-07 | 1997-04-02 | Barrow Hepburn Sala Ltd | Safety lifeline shock absorber |
| GB2334319A (en) * | 1998-01-09 | 1999-08-18 | Pavlos Yiannakopoulos | Multiple use energy absorption element |
| US20050012319A1 (en) * | 2003-07-14 | 2005-01-20 | Kurt Schulz | Load limiting structure for vehicle occupant restraint system |
| FR2920997A1 (en) * | 2007-09-19 | 2009-03-20 | Ajuva Safety Sarl | Potential and kinetic energy absorbing device for e.g. cable fixation stud, has male unit with teeth stopped and deformed against rim of opening for limiting or blocking relative sliding of male and female units subjected to traction force |
| DE202012010035U1 (en) * | 2011-10-20 | 2013-02-18 | Rodigas S.R.L. | Energy converter for safety lines and safety line with such a converter device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201702088D0 (en) | 2017-03-22 |
| GB2515341A (en) | 2014-12-24 |
| GB201311100D0 (en) | 2013-08-07 |
| GB2515341B (en) | 2017-07-12 |
| GB2543699B (en) | 2017-06-07 |
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