EP2724752B1 - Fall arrest harness - Google Patents
Fall arrest harness Download PDFInfo
- Publication number
- EP2724752B1 EP2724752B1 EP13190838.6A EP13190838A EP2724752B1 EP 2724752 B1 EP2724752 B1 EP 2724752B1 EP 13190838 A EP13190838 A EP 13190838A EP 2724752 B1 EP2724752 B1 EP 2724752B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- straps
- extension
- shoulder
- wearer
- strap
- 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.)
- Not-in-force
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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
- A62B35/0006—Harnesses; Accessories therefor
- A62B35/0012—Sit harnesses
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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
- A62B35/0006—Harnesses; Accessories therefor
- A62B35/0018—Full body harnesses covering at least shoulders and thighs
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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
- A62B35/0006—Harnesses; Accessories therefor
- A62B35/0025—Details and accessories
- A62B35/0037—Attachments for lifelines and lanyards
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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
- A62B35/04—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
Definitions
- the present invention relates to a fall arrest harness for persons working at height, and in particular a fall arrest harness for reducing the risk of suspension trauma.
- a typical fall arrest harness includes leg straps arranged to encircle the wearer's thighs, and a pair of shoulder straps extending over the wearer's shoulders, and a lanyard connection member, usually in the form of a D-ring, for connecting the harness to a lanyard.
- the lanyard connection member is usually provided in a dorsal position, on the wearer's back above the wearer's centre of gravity substantially level with the shoulder blades, such that the wearer is suspended in a substantially vertical, feet-down, head-up position.
- most legislation governing fall arrest harness design requires a dorsal lanyard connection, or at least an attachment point positioned to cause the wearer to be suspended in a head-up position inclined to the vertical by no more than 50° (such as standard EN 361 in the United Kingdom).
- suspension trauma or suspension induced pathology can cause serious injury and even death due to what has become known as suspension trauma or suspension induced pathology.
- This is believed to be caused by the pooling of blood in the suspended person's legs (known as venous pooling) and is particularly aggravated by the leg loops or straps concentrating pressure at the inside thigh and/or groin area and causing restriction of the venous system in the legs, encouraging venous pooling and the onset of suspension trauma.
- venous pooling starves the brain and other organs, such as the liver, of oxygen, leading to orthostatic shock and ultimately death.
- An object of the present invention is to provide a fall arrest harness that avoids or at least greatly delays the onset of suspension trauma.
- a fall arrest harness for arresting the fall of a person working at height comprising:
- the lanyard connection member is accessible to the wearer in front of the wearer's body, making it possible for the wearer to pull themselves back up the lanyard using an ascender device.
- Preferably further strap portions extend between side regions of the back portion of the rear section and the shoulder straps.
- the lanyard connection member is connected to the sternal region of the shoulder straps via one or more extension straps, the lanyard connection member being releasably attachable to the back portion of the rear section at a dorsal position by releasable securing means whereby the lanyard connection member is detached from the back portion when a tensile force applied to the lanyard connection member exceeds a predetermined threshold such that the lanyard connection member separates from the back portion in the event of a fall.
- the lanyard connection member is located in a convenient dorsal position during normal movement of the wearer, preventing the lanyard from interfering with work operations carried out by the wearer, but automatically moves to a sternal suspension position in the event of a fall to suspend the user in the desired position with the wearer's weight supported by the rear section and the shoulder straps.
- At least a portion of the one or more extension straps may be formed from an energy absorbing material.
- said energy absorbing portion comprises a region capable of irreversible elongation under the action of a tensile force.
- At least a portion of the one or more extension straps is detachably retained in contact with the shoulder straps and/or the back portion of the rear section by separable or releasable securing mean s to slow and control the detachment of the one or more extension straps from the shoulder straps and/or the back portion and thus to control the release of the lanyard connection member from its dorsal position to its extended sternal suspension position in the event of a fall to absorb the energy of the fall and to control and guide the movement of the wearer towards the suspended, supine position.
- the separable or releasable securing means of the lanyard connection member and/or the one or more extension straps may comprise preferentially tearable securing means, such as tearable stitching, or hook and loop fastening means attached respectively to the lanyard connection member and/or the one or more extension straps and the regions of the shoulder straps and/or rear section to which they are releasably attached.
- tearable securing means such as tearable stitching, or hook and loop fastening means attached respectively to the lanyard connection member and/or the one or more extension straps and the regions of the shoulder straps and/or rear section to which they are releasably attached.
- other forms of separable or releasable securing means may be used for the lanyard connection member and/or the one or more extension straps, such as preferentially releasable adhesive or press stud fasteners or similar.
- rear section comprises a single panel to which the shoulder straps and leg straps are connected.
- the length of the rear section may be adjustable to suit the body length of the wearer.
- the length of the rear section may automatically increase during the shock of a fall, preferably by virtue of similar releasable securing means as those used for the lanyard connection and/or one or more extension straps to allow the wearer to sit deeper into the rear section when in the suspended position to further relax any residual tension on the leg straps.
- the shoulder straps comprise a first shoulder strap extending from the back portion of the rear section to one side portion of the seat portion adjacent the lower edge thereof and a second shoulder strap extending from the back portion of the rear section to an opposite side portion of the seat portion the lower edge thereof, first and second extension straps being provided, the first extension strap extending from a sternal region of the first shoulder strap and being provided with releasable fastening means, such as preferentially tearable securing means, such as stitching, or hook and loop fastening material, such that the first extension strap can be releasably secured in contact with the first shoulder strap and a portion of the rear section, the second extension strap extending from a sternal region of the second shoulder strap and being provided with releasable fastening means, such as preferentially tearable securing means, such as stitching, or hook an loop fastening material, such that the second extension strap can be releasably secured in contact with the second shoulder strap and a portion of the rear section
- the lanyard connection member is preferably located in a dorsal position on the back portion or the rear section when the first and second extension straps are located in their stowed positions in contact with the first and second shoulder straps and the rear section.
- a further separable or releasable securing means may be provided for securing the lanyard connection member to the rear section, such as a flap insertable through the lanyard connection member and secured at one end to the rear section in said dorsal position and provided with releasable fastening means, such as hook and loop fastening means, for securing the flap.
- the regions of the first and second extension straps overlying and attached to the rear section are covered by a cover member, such as a flap, releasably secured to the rear section, for example by means of hook and loop fastening means.
- a cover member such as a flap
- each of the first and second shoulder straps may be provided with a cover flap adapted to cover a portion of the respective extension strap in contact with the respective shoulder strap, said flap being securable to said portion of the respective extension strap by means of a releasable fastener, such as hook and loop fastening means.
- leg straps extend between side regions of the seat portion of the rear section and a central region of the seat portion.
- the seat portion of the rear section may define a pocket within which can be received a foam seat panel or padding to provide improved support for the seat region of the wearer and enhanced comfort.
- the seat panel may be formed from a rigid material to provide enhanced support for the wearer and facilitate use of the harness for longer periods of suspension.
- One or more further strap portions may be provided extending between the shoulder straps to extend across the chest of the wearer to prevent migration of the shoulder straps off the shoulders of the wearer during normal movement of the wearer. At least one of said one or more further strap portions may be elasticated to avoid restricting the movement of the wearer.
- Each of said one or more further strap portions may be provided with a separable fastening means, such as a buckle, to permit the harness to be taken on and off.
- one or each of the leg straps and shoulder straps may be include separable fastening means and may be adjustable in length to enable the harness to be fitted to the wearer's body, as is commonly provided in known fall arrest harnesses.
- the shoulder straps may comprise continuous strap members extending along and through the length of the rear section.
- a fall arrest harness comprises a main panel 1 formed from a textile material to which a plurality of strap means are secured by stitching.
- the main panel defines a seat portion 2 adapted to overlie the seat or sub-pelvic region of the wearer and a back portion 3 adapted to overlie the back of the wearer.
- a pair of shoulder straps 4,5 extend between the top of the back portion 3 and the side regions of the seat portion 2 adjacent the lower edge of the seat portion 2.
- the shoulder straps 4,5 are provided with a buckle arrangement 6,7 to permit each shoulder straps 4,5 to be uncoupled to fit the harness to a wearer and to permit the length of each shoulder strap 4,5 to be varied to obtain the required fit.
- buckle arrangements are well known in harness construction and need not be described in more detail.
- a pair of side straps 8,9 extend between side regions of the back portion 3 and lower regions of respective shoulder straps 4,5 to prevent a wearer from falling out of the sides of the harness.
- First and second cross straps 10,11 having releasable connectors therein extend between the shoulder straps 4,5 across the torso of the wearer to prevent the shoulder straps 4,5 from migrating off the wearer's shoulders during normal movement.
- the upper, and possibly also the lower, cross strap 10,11 may be formed from an elastic material.
- a pair of leg straps 12,13 are attached to the seat portion 2 extending between side regions of the seat portion 2 and a central region of the seat portion 2.
- Each leg strap 12,13 is provided with a buckle arrangement 14,15 to permit the leg straps 12,13 to be uncoupled to fit the harness to a wearer and to permit the length of the leg straps 12,13 to be varied to obtain the required fit.
- the leg straps 12,13 are merely intended to locate the harness on the wearer and form no part in the load bearing function of the harness when a person is suspended from the harness, as will be described below.
- a pair of elongate extension straps 16,17 extend from upper portions of the shoulder straps 4,5 from a position adjacent the buckles 6,7, such position being level with the chest of the wearer in use.
- the distal ends of the extension straps 16,17 terminate in a lanyard connection member 18 in the form a triangular metal loop or D-ring for the attachment of a lanyard.
- the extension straps 16,17 and the upper regions of the shoulder straps 4,5 are releasably secured to the shoulder straps 4,5 in a stowed configuration by means of tearable securing means, such as preferentially tearable stitching or portions of hook and loop fastening material 20 (such as that sold under the Registered Trade Mark “Velcro").
- tearable securing means such as preferentially tearable stitching or portions of hook and loop fastening material 20 (such as that sold under the Registered Trade Mark "Velcro").
- tearable securing means such as preferentially tearable stitching or portions of hook and loop fastening material 20 (such as that sold under the Registered Trade Mark "Velcro").
- a cover flap 21 is provided, attached at one end to the back portion of the main panel, said cover flap 21 being releasably secured to said extension straps 16,17 and or back portion 3.
- a further retention flap 22 provided with hook and loop fastening material 20 is located on the back portion 3 to extend through the lanyard connection member 18 to hold the lanyard connection member 18 in the desired dorsal location during the normal activities of the wearer.
- the harness may be comfortably worn during the normal working activities of the wearer whilst connected to a safety lanyard without interfering in the movement or activities of the wearer.
- the tension applied to the lanyard connection member 18 by the lanyard causes the lanyard connection member 18 and the associated extension straps 16,17 to gradually separate from the back panel 3 and the shoulder straps 4,5 until the extension straps 16,17 and lanyard connection member 18 reach a suspended configuration, as shown in Fig. 5 , wherein the wearer is suspended in a supine position with the weight of the wearer borne by the seat portion 2 and back portion 3 of the main panel 1 and transferred to the lanyard connection member 18 via the shoulder straps 4,5 and the extension straps 16,17.
- the spreading of the wearer's weight over the area of the main panel 1 avoids pressure concentrations that occur with prior art strap arrangements and, combined with the supine position, provide greater comfort and reduced stress for the wearer when suspended by the lanyard connection member 18 of the harness.
- the strength of the tearable securing means 20 can be optimised to provide a gradual guided release of the extension straps 16,17 and lanyard connection portion 18 between its stowed and suspended configurations and thus a controlled and guided movement of the wearer between uncontrolled fall and the supine suspended position.
- cover flaps 23,24 may be provided on the shoulder straps 4,5 adapted to overlie the extension straps 16,17, the cover flaps 23,24 being provided with hook and loop fastening material 20 to releasably secure the cover flaps 23,24 to the extension straps 16,17.
- the extension straps 16,17 are formed from an energy absorbing material whereby the straps are adapted to deform or partially tear or include weakly stitched separable regions such that the straps irreversibly elongate when exposed to a tensile force beyond a predetermined level.
- the set portion 2 may be provided with a pocket 25 within which can be located a padded seat panel formed, for example, from a closed cell polymeric foam material.
- a single extension strap may be provided extending between the shoulder straps, possibly attached to a cross strap extending between the shoulder straps, to a detachable connection means provided at a dorsal location on the rear section of the harness.
- releasable fastening means other than hook and loop fastening means might be utilised to releasably attach the lanyard connection member to the dorsal location and/or the one or more extension straps to the other portions of the harness.
- the various strap portions may be connected to the rear section of the harness such that the material of the rear section is load bearing or the strap portions (in particular the shoulder straps) may be continuous and extend over the length of the rear section.
- connection between the shoulder straps 4,5 and the respective side straps 8,9 may be provided by a ring or similar linking means to which the straps are connected.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Lowering Means (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Description
- The present invention relates to a fall arrest harness for persons working at height, and in particular a fall arrest harness for reducing the risk of suspension trauma.
- The Work at Height Regulations 2005 place a duty on all employers to do all that is practicable to prevent falls where employees must work at height where there is a risk of a fall liable to cause personal injury.
- This duty requires persons working at height where there is a risk of a fall to wear a fall arrest or safety harness attached by a lanyard to a fixed point whereby, should a fall occur, the fall is arrested before the person hits the ground. A typical fall arrest harness includes leg straps arranged to encircle the wearer's thighs, and a pair of shoulder straps extending over the wearer's shoulders, and a lanyard connection member, usually in the form of a D-ring, for connecting the harness to a lanyard.
- In order to minimise interference with the work being carried out and to minimise the risk of injury during fall arrest in a typical feet first fall, the lanyard connection member is usually provided in a dorsal position, on the wearer's back above the wearer's centre of gravity substantially level with the shoulder blades, such that the wearer is suspended in a substantially vertical, feet-down, head-up position. Indeed most legislation governing fall arrest harness design requires a dorsal lanyard connection, or at least an attachment point positioned to cause the wearer to be suspended in a head-up position inclined to the vertical by no more than 50° (such as standard EN 361 in the United Kingdom).
- However, suspension of a person by a fall arrest harness for more than a few minutes, particularly when the person is unconscious, can cause serious injury and even death due to what has become known as suspension trauma or suspension induced pathology. This is believed to be caused by the pooling of blood in the suspended person's legs (known as venous pooling) and is particularly aggravated by the leg loops or straps concentrating pressure at the inside thigh and/or groin area and causing restriction of the venous system in the legs, encouraging venous pooling and the onset of suspension trauma. Such venous pooling starves the brain and other organs, such as the liver, of oxygen, leading to orthostatic shock and ultimately death. Such suspension trauma can become fatal with known fall arrest harnesses within twenty minutes of immobile suspension and thus it is vital to rescue the suspended person as quickly as possible. When the fall occurs in an inaccessible location, it is often difficult to reach the person quickly enough, leading to a real risk of death due to suspension trauma.
- One example of a prior art fall arrest harness is disclosed in patent document
EP 0 508 278 A . This harness has a pair of shoulder straps which extend around the back of the person wearing the harness where these straps cross over. The straps are joined together above and below the point where these straps cross over by separate upper and lower back portions. Beneath and separate from the lower back support is a pair of leg straps each of which is joined to a lower end of one of the shoulder straps and which cross over behind the wearer to form seat straps. When the fall arrest harness breaks a fall, the wearer is supported in a substantially upright orientation with no weight on the spine and with the weight of the body resting substantially on the seat straps. - Another example of fall harness is disclosed in document
US 2006/0169534 A1 . - An object of the present invention is to provide a fall arrest harness that avoids or at least greatly delays the onset of suspension trauma. According to the present invention there is provided a fall arrest harness for arresting the fall of a person working at height comprising:
- a pair of leg straps for encircling the thighs of a wearer of said fall arrest harness and for locating the fall arrest harness on a wearer of said harness;
- a first shoulder strap configured to extend over the left shoulder and left chest region of said wearer, and a second shoulder strap configured to extend over the right shoulder and right chest region of said wearer;
- a lanyard connection member for connection to a safety lanyard;
- one or more extension straps, the lanyard connection member being connected to said shoulder straps via said one or more extension straps; and
- a rear section, the rear section extending between said pair of leg straps and said first and second shoulder straps and having a seat portion and a back portion, the seat portion being adapted to lie across the sub-pelvic region or seat of the wearer, and the back portion being adapted to overlie at least a portion of the back of the wearer, characterised in that:
- the first shoulder strap extends between a left side region of the seat portion and an upper region of the back portion;
- the second shoulder strap extends between a right side region of the seat portion and an upper region of the back portion;
the lanyard connection member is releasably attachable to the back portion of the rear section at a dorsal position by releasable securing means and is separately connected to both the first and second shoulder straps via said one or more extension straps at, respectively, said left and right chest regions; and - the lanyard connection member is detachable from the back portion when a tensile force applied to the lanyard connection member exceeds a predetermined threshold such that in the event of a fall the lanyard connection member separates from the back portion, whereby the one or more extension straps and the lanyard connection member automatically move to a sternal suspension position to suspend the wearer from both of said first and second shoulder straps in a supine position with the weight of the wearer being borne by the seat portion and the back portion of the rear section and being transferred to the lanyard connection member via both said first and second shoulder straps and the one or more extension straps with none of said weight being transferred by the leg straps.
- By suspending the wearer in a supine position, with the weight of the wearer spread across the seat portion and back portion of the rear section and borne by the shoulder straps with no load being borne by the leg straps, the restriction of the venous system in the legs due to the concentration of pressure at the inside thigh and/or groin area caused by the leg loops or straps is thus avoided. Furthermore, the lanyard connection member is accessible to the wearer in front of the wearer's body, making it possible for the wearer to pull themselves back up the lanyard using an ascender device.
- Preferably further strap portions extend between side regions of the back portion of the rear section and the shoulder straps.
- Preferably the lanyard connection member is connected to the sternal region of the shoulder straps via one or more extension straps, the lanyard connection member being releasably attachable to the back portion of the rear section at a dorsal position by releasable securing means whereby the lanyard connection member is detached from the back portion when a tensile force applied to the lanyard connection member exceeds a predetermined threshold such that the lanyard connection member separates from the back portion in the event of a fall. Thus the lanyard connection member is located in a convenient dorsal position during normal movement of the wearer, preventing the lanyard from interfering with work operations carried out by the wearer, but automatically moves to a sternal suspension position in the event of a fall to suspend the user in the desired position with the wearer's weight supported by the rear section and the shoulder straps.
- In order to absorb some of the force applied to the wearer due to the sudden deceleration caused by the harness and lanyard when a fall is arrested, at least a portion of the one or more extension straps may be formed from an energy absorbing material. Preferably said energy absorbing portion comprises a region capable of irreversible elongation under the action of a tensile force.
- Preferably at least a portion of the one or more extension straps is detachably retained in contact with the shoulder straps and/or the back portion of the rear section by separable or releasable securing mean s to slow and control the detachment of the one or more extension straps from the shoulder straps and/or the back portion and thus to control the release of the lanyard connection member from its dorsal position to its extended sternal suspension position in the event of a fall to absorb the energy of the fall and to control and guide the movement of the wearer towards the suspended, supine position.
- The separable or releasable securing means of the lanyard connection member and/or the one or more extension straps may comprise preferentially tearable securing means, such as tearable stitching, or hook and loop fastening means attached respectively to the lanyard connection member and/or the one or more extension straps and the regions of the shoulder straps and/or rear section to which they are releasably attached. However, it is envisaged that other forms of separable or releasable securing means may be used for the lanyard connection member and/or the one or more extension straps, such as preferentially releasable adhesive or press stud fasteners or similar.
- In a preferred embodiment rear section comprises a single panel to which the shoulder straps and leg straps are connected. Thus the weight of the wearer is spread evenly across the wearer's seat and back and the risk of the wearer falling out of the harness is obviated. The length of the rear section may be adjustable to suit the body length of the wearer. In one embodiment the length of the rear section may automatically increase during the shock of a fall, preferably by virtue of similar releasable securing means as those used for the lanyard connection and/or one or more extension straps to allow the wearer to sit deeper into the rear section when in the suspended position to further relax any residual tension on the leg straps.
- In one embodiment, the shoulder straps comprise a first shoulder strap extending from the back portion of the rear section to one side portion of the seat portion adjacent the lower edge thereof and a second shoulder strap extending from the back portion of the rear section to an opposite side portion of the seat portion the lower edge thereof, first and second extension straps being provided, the first extension strap extending from a sternal region of the first shoulder strap and being provided with releasable fastening means, such as preferentially tearable securing means, such as stitching, or hook and loop fastening material, such that the first extension strap can be releasably secured in contact with the first shoulder strap and a portion of the rear section, the second extension strap extending from a sternal region of the second shoulder strap and being provided with releasable fastening means, such as preferentially tearable securing means, such as stitching, or hook an loop fastening material, such that the second extension strap can be releasably secured in contact with the second shoulder strap and a portion of the rear section, whereby the first and second extension straps can be attached to the first and second shoulder straps and the rear section in a stowed position, the distal ends of the first and second extension straps being connected to a lanyard connection member, such as a D-ring.
- The lanyard connection member is preferably located in a dorsal position on the back portion or the rear section when the first and second extension straps are located in their stowed positions in contact with the first and second shoulder straps and the rear section.
- A further separable or releasable securing means may be provided for securing the lanyard connection member to the rear section, such as a flap insertable through the lanyard connection member and secured at one end to the rear section in said dorsal position and provided with releasable fastening means, such as hook and loop fastening means, for securing the flap.
- Preferably the regions of the first and second extension straps overlying and attached to the rear section are covered by a cover member, such as a flap, releasably secured to the rear section, for example by means of hook and loop fastening means.
- In order to further delay and control the release of the extension straps from their stowed positions in contact with the shoulder straps, each of the first and second shoulder straps may be provided with a cover flap adapted to cover a portion of the respective extension strap in contact with the respective shoulder strap, said flap being securable to said portion of the respective extension strap by means of a releasable fastener, such as hook and loop fastening means.
- Preferably the leg straps extend between side regions of the seat portion of the rear section and a central region of the seat portion.
- The seat portion of the rear section may define a pocket within which can be received a foam seat panel or padding to provide improved support for the seat region of the wearer and enhanced comfort. The seat panel may be formed from a rigid material to provide enhanced support for the wearer and facilitate use of the harness for longer periods of suspension.
- One or more further strap portions may be provided extending between the shoulder straps to extend across the chest of the wearer to prevent migration of the shoulder straps off the shoulders of the wearer during normal movement of the wearer. At least one of said one or more further strap portions may be elasticated to avoid restricting the movement of the wearer. Each of said one or more further strap portions may be provided with a separable fastening means, such as a buckle, to permit the harness to be taken on and off. Similarly, one or each of the leg straps and shoulder straps may be include separable fastening means and may be adjustable in length to enable the harness to be fitted to the wearer's body, as is commonly provided in known fall arrest harnesses.
- The shoulder straps may comprise continuous strap members extending along and through the length of the rear section.
- An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
-
Fig. 1 is a front view of a fall arrest harness according to an embodiment of the present invention showing the lanyard attachment member in its stowed configuration; -
Fig. 2 is a rear view of the fall arrest harness ofFig. 1 ; -
Fig. 3 is a rear view of the fall arrest harness ofFig. 1 with the cover flap detached showing the extension straps in their stowed configuration; -
Fig. 4 is a perspective view of the harness ofFig. 1 with the extension straps and lanyard connection member in their suspended configuration, separated from the shoulder straps and back portion; and -
Fig 5 is a side view of the fall arrest harness ofFig. 1 in use in its suspended configuration. - As shown in the drawings, a fall arrest harness according to a preferred embodiment of the present invention comprises a main panel 1 formed from a textile material to which a plurality of strap means are secured by stitching. The main panel defines a
seat portion 2 adapted to overlie the seat or sub-pelvic region of the wearer and aback portion 3 adapted to overlie the back of the wearer. A pair ofshoulder straps back portion 3 and the side regions of theseat portion 2 adjacent the lower edge of theseat portion 2. Theshoulder straps buckle arrangement shoulder straps shoulder strap - A pair of
side straps back portion 3 and lower regions ofrespective shoulder straps - First and second cross straps 10,11 having releasable connectors therein extend between the
shoulder straps shoulder straps cross strap - A pair of leg straps 12,13 are attached to the
seat portion 2 extending between side regions of theseat portion 2 and a central region of theseat portion 2. Eachleg strap buckle arrangement - A pair of elongate extension straps 16,17 extend from upper portions of the
shoulder straps buckles lanyard connection member 18 in the form a triangular metal loop or D-ring for the attachment of a lanyard. - The extension straps 16,17 and the upper regions of the
shoulder straps shoulder straps back portion 3 of the main panel 1 and are secured thereto by the tearable securing means 20, whereby thelanyard connection member 18 is located at a dorsal position such that the lanyard connected thereto does not interfere with the work being carried out by the wearer. - A
cover flap 21 is provided, attached at one end to the back portion of the main panel, saidcover flap 21 being releasably secured to said extension straps 16,17 and orback portion 3. Afurther retention flap 22 provided with hook andloop fastening material 20 is located on theback portion 3 to extend through thelanyard connection member 18 to hold thelanyard connection member 18 in the desired dorsal location during the normal activities of the wearer. - Thus the harness may be comfortably worn during the normal working activities of the wearer whilst connected to a safety lanyard without interfering in the movement or activities of the wearer.
- In the event of a fall, the tension applied to the
lanyard connection member 18 by the lanyard causes thelanyard connection member 18 and the associated extension straps 16,17 to gradually separate from theback panel 3 and theshoulder straps lanyard connection member 18 reach a suspended configuration, as shown inFig. 5 , wherein the wearer is suspended in a supine position with the weight of the wearer borne by theseat portion 2 andback portion 3 of the main panel 1 and transferred to thelanyard connection member 18 via theshoulder straps - Because the wearer is suspended in a supine position with the wearer's weight supported by the broad main panel 1, no weight is transferred through the leg straps 12,13 and thus no pressure is placed on the inside thigh and/or groin area, as occurs in prior art harnesses where leg straps are used to support the weight of the wearer. Thus the venous system of the legs is not restricted and the onset of suspension trauma is greatly delayed, or even avoided.
- Furthermore, the spreading of the wearer's weight over the area of the main panel 1 avoids pressure concentrations that occur with prior art strap arrangements and, combined with the supine position, provide greater comfort and reduced stress for the wearer when suspended by the
lanyard connection member 18 of the harness. - The use of tearable securing means 20 on the extension straps 16,17,
cover flap 21 andretention flap 22, and in particular the releasable attachment of the extension straps 16,17 to theshoulder straps back portion 3 over substantially the entire length of the extension straps 16,17, effectively absorbs the shock of the initial arrest of the fall by the lanyard. - Furthermore, the strength of the tearable securing means 20 can be optimised to provide a gradual guided release of the extension straps 16,17 and
lanyard connection portion 18 between its stowed and suspended configurations and thus a controlled and guided movement of the wearer between uncontrolled fall and the supine suspended position. - To provide further resistance to the separation of the extension straps 16,17 from the
shoulder straps shoulder straps shoulder straps loop fastening material 20 to releasably secure the cover flaps 23,24 to the extension straps 16,17. - To further absorb the decelerative force applied to the wearer by the harness in the event of a fall, the extension straps 16,17 are formed from an energy absorbing material whereby the straps are adapted to deform or partially tear or include weakly stitched separable regions such that the straps irreversibly elongate when exposed to a tensile force beyond a predetermined level.
- To further increase the comfort of the wearer when suspended by the harness, the
set portion 2 may be provided with apocket 25 within which can be located a padded seat panel formed, for example, from a closed cell polymeric foam material. - For example, a single extension strap may be provided extending between the shoulder straps, possibly attached to a cross strap extending between the shoulder straps, to a detachable connection means provided at a dorsal location on the rear section of the harness. Also it is envisaged that releasable fastening means other than hook and loop fastening means might be utilised to releasably attach the lanyard connection member to the dorsal location and/or the one or more extension straps to the other portions of the harness. The various strap portions may be connected to the rear section of the harness such that the material of the rear section is load bearing or the strap portions (in particular the shoulder straps) may be continuous and extend over the length of the rear section.
- The connection between the
shoulder straps respective side straps - Various modifications and variations to the described embodiment of the invention will be apparent to those skilled in the art without departing from the scope of the invention as defined in the appended claims. Although the invention has been described in connection with a specific preferred embodiment, it should be understood that the invention as claimed should not be unduly limited to such specific embodiment.
Claims (15)
- A fall arrest harness for arresting the fall of a person working at height comprising:- a pair of leg straps (12,13) for encircling the thighs of a wearer of said fall arrest harness and for locating the fall arrest harness on a wearer of said harness;- a first shoulder strap (5), configured to extend over the left shoulder and left chest region of said wearer, and a second shoulder strap (4), configured to extend over the right shoulder and right chest region of said wearer;- a lanyard connection member (18) for connection to a safety lanyard;- one or more extension straps (16,17), the lanyard connection member (18) being connected to said shoulder straps (4,5) via said one or more extension straps (16,17); and- a rear section, the rear section extending between said pair of leg straps (12,13) and said first and second shoulder straps and having a seat portion (2) and a back portion (3), the seat portion being adapted to lie across the sub-pelvic region or seat of the wearer, and the back portion being adapted to overlie at least a portion of the back of the wearer, characterised in that:- the first shoulder strap (5) extends between a left side region of the seat portion (2) and an upper region of the back portion (3);- the second shoulder strap (4) extends between a right side region of the seat portion (2) and an upper region of the back portion (3);
the lanyard connection member (18) is releasably attachable to the back portion (3) of the rear section at a dorsal position by releasable securing means (21,22) and is separately connected to both the first and second shoulder straps via said one or more extension straps (16,17) at, respectively, said left and right chest regions; and- the lanyard connection member (18) is detachable from the back portion (3) when a tensile force applied to the lanyard connection member (18) exceeds a predetermined threshold such that in the event of a fall the lanyard connection member (18) separates from the back portion, whereby the one or more extension straps (16,17) and the lanyard connection member (18) automatically move to a sternal suspension position to suspend the wearer from both of said first and second shoulder straps in a supine position with the weight of the wearer being borne by the seat portion (2) and the back portion (3) of the rear section and being transferred to the lanyard connection member (18) via both said first and second shoulder straps and the one or more extension straps (16,17) with none of said weight being transferred by the leg straps (12,13). - A fall arrest harness as claimed in claim 1, wherein the first shoulder strap (5) extends between said left side region of the seat portion (2) adjacent a lower edge thereof and said upper region of the back portion (3), and the second shoulder strap (4) extends between said right side region of the seat portion (2) adjacent a lower edge thereof, and said upper region of the back portion (3).
- A fall arrest harness as claimed in claim 1 or claim 2, wherein strap portions (8,9) extend between side regions of the back portion (3) of the rear section and the shoulder straps (4,5).
- A fall arrest harness as claimed in any preceding claim, wherein at least a portion of the one or more extension straps (16,17) is formed from an energy absorbing material for absorbing energy when a fall is arrested.
- A fall arrest harness as claimed in claim 4, wherein said energy absorbing material comprises a region capable of irreversible elongation under the action of a tensile force.
- A fall arrest harness as claimed in any preceding claim, wherein at least a portion of the one or more extension straps is detachably retained in contact with regions of the shoulder straps and/or the back portion (3) of the rear section by separable or releasable securing means (20,23,24) to slow and control the detachment of the one or more extension straps from the shoulder straps and/or the back portion (3) and thus to control the release of the lanyard connection member (18) from its dorsal position to its extended sternal suspension position in the event of a fall to absorb the energy of the fall and to control and guide the movement of the wearer towards the suspended, supine position.
- A fall arrest harness as claimed in claim 6, wherein said separable or releasable securing means (20,23,24) comprises tearable securing means (20) attached respectively to the lanyard connection member (18) and/or the one or more extension straps (16,17) and the regions of the shoulder straps (4,5) and/or the rear section to which said one or more extension straps are releasably attached.
- A fall arrest harness as claimed any preceding claim, wherein the lanyard connection member (18) is separately connected to said chest regions of the shoulder straps via two extension straps, a first extension strap (17) and a second extension strap (16), the first extension strap being connected to the first shoulder strap (5) and the second extension strap being connected to the second shoulder strap (4).
- A fall arrest harness as claimed any one of claims 1 to 7, wherein the lanyard connection member (18) is separately connected to said chest regions of the shoulder straps via one extension strap, said extension strap extending between the first shoulder strap (5) and the second shoulder strap (4).
- A fall arrest harness as claimed in claim 8, wherein regions of the first and second extension straps (17,16) are detachably retained in contact with, respectively, the first and second shoulder straps and the rear section in a stowed position, the first and second extension straps each having a distal end and the distal ends of the first and second extension straps being connected to said lanyard connection member (18).
- A fall arrest harness as claimed in claim 10, wherein regions of the first and second extension straps (17,16) overlying and attached to the rear section are covered by a cover member (21) releasably secured to the rear section.
- A fall arrest harness as claimed in claim 10 or claim 11, wherein each of the first and second shoulder straps is provided with a cover flap (23,24) adapted to cover a portion of the respective extension strap (16,17) in contact with the respective shoulder strap, said cover flap being securable to said portion of the respective extension strap by means of a releasable fastener (20).
- A fall arrest harness as claimed in any preceding claim, wherein the leg straps (12,13) extend between said left and right side regions of the seat portion (2) of the rear section and a central region of the seat portion.
- A fall arrest harness as claimed in any preceding claim, wherein the seat portion (2) of the rear section defines a pocket (25) within which can be received a foam seat panel or padding to provide improved support for the seat region of the wearer and enhanced comfort.
- A fall arrest harness as claimed in claim 14, wherein the seat panel is formed from a rigid material to provide enhanced support for the wearer and facilitate use of the harness for longer periods of suspension.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT131908386T PT2724752T (en) | 2006-12-11 | 2006-12-11 | Fall arrest harness |
ES13190838.6T ES2629200T3 (en) | 2006-12-11 | 2006-12-11 | Fall protection harness |
EP13190838.6A EP2724752B1 (en) | 2006-12-11 | 2006-12-11 | Fall arrest harness |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06820485A EP2091615A1 (en) | 2005-12-13 | 2006-12-11 | Fall arrest harness |
EP13190838.6A EP2724752B1 (en) | 2006-12-11 | 2006-12-11 | Fall arrest harness |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06820485A Division EP2091615A1 (en) | 2005-12-13 | 2006-12-11 | Fall arrest harness |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2724752A2 EP2724752A2 (en) | 2014-04-30 |
EP2724752A3 EP2724752A3 (en) | 2015-12-09 |
EP2724752B1 true EP2724752B1 (en) | 2017-03-29 |
Family
ID=50397484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13190838.6A Not-in-force EP2724752B1 (en) | 2006-12-11 | 2006-12-11 | Fall arrest harness |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2724752B1 (en) |
ES (1) | ES2629200T3 (en) |
PT (1) | PT2724752T (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10702723B2 (en) | 2016-12-12 | 2020-07-07 | Msa Technology, Llc | Harness with structural tear tape |
US10799731B2 (en) | 2016-12-12 | 2020-10-13 | Msa Technology, Llc | Harness with integrated energy absorber |
US11191325B2 (en) | 2018-04-13 | 2021-12-07 | Msa Technology, Llc | Harness connection arrangement |
US11660476B2 (en) | 2019-06-28 | 2023-05-30 | Msa Technology, Llc | Articulated harness connection arrangement with integrated attachment element |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107238455B (en) * | 2017-05-10 | 2023-05-26 | 浙江华电器材检测研究所有限公司 | Method for testing pressing force of safety belt on human body |
AT520047B1 (en) * | 2017-06-14 | 2019-10-15 | Ing Hans Julian Dzugan | Auffanggurtvorrichtung |
US11974639B2 (en) | 2018-07-09 | 2024-05-07 | Msa Technology, Llc | Harness connection arrangement |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4206873A1 (en) | 1991-04-08 | 1992-10-15 | Manfred Meckel Fabrik Fuer Sic | SAFETY HARNESS WITH INTERFERENCE FUNCTION |
FR2743303B1 (en) * | 1996-01-08 | 1998-03-20 | Sup Air | IMPROVEMENT FOR ROPE HARNESSES |
FR2796297B1 (en) * | 1999-07-16 | 2001-10-26 | Zedel | HANGING HARNESS WITH DEPOSITED HANGING LONG |
US7909137B2 (en) * | 2002-06-20 | 2011-03-22 | Trophyline, Llc | Support harness |
-
2006
- 2006-12-11 PT PT131908386T patent/PT2724752T/en unknown
- 2006-12-11 ES ES13190838.6T patent/ES2629200T3/en active Active
- 2006-12-11 EP EP13190838.6A patent/EP2724752B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10702723B2 (en) | 2016-12-12 | 2020-07-07 | Msa Technology, Llc | Harness with structural tear tape |
US10799731B2 (en) | 2016-12-12 | 2020-10-13 | Msa Technology, Llc | Harness with integrated energy absorber |
US11191325B2 (en) | 2018-04-13 | 2021-12-07 | Msa Technology, Llc | Harness connection arrangement |
US11660476B2 (en) | 2019-06-28 | 2023-05-30 | Msa Technology, Llc | Articulated harness connection arrangement with integrated attachment element |
Also Published As
Publication number | Publication date |
---|---|
EP2724752A3 (en) | 2015-12-09 |
PT2724752T (en) | 2017-06-30 |
ES2629200T3 (en) | 2017-08-07 |
EP2724752A2 (en) | 2014-04-30 |
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