Patent Grant
10799731
The present invention relates generally to a fall protection harness and, in particular, to a fall protection harness having an integrated energy absorber.
As is known in the art, there exist various safety devices and arrangements that can be worn by or attached to a user to ensure the wearer's safety in certain situations. Such mechanisms come in many forms, including, but not limited to, harnesses and safety belts. Full body harnesses are widely used for lifting and lowering individuals in dangerous situations and as a primary component in a personal fall arrest system. These harnesses can also be used for work positioning, travel restriction, ladder climbing, rescue retrieval, and evacuation. While these harnesses are used mainly in an industrial setting, and particularly the construction industry where the likelihood and danger of falls from heights is both numerous and significant, a full body harness can be used in various other applications in which total suspension and support of the body must be ensured, either expectedly or unexpectedly.
While there are many variations in full body harness construction, all typically include a plurality of elongate straps that are combined together to fit around a user's body. In some embodiments or aspects, a full body harness may have an attachment point (D-ring) typically positioned in a central portion of the user's back, and a plurality of straps routed around predetermined portions of the user's body in such a manner as to hold or suspend the user in the event of a fall.
Full body harnesses, when used in a personal fall arrest system, must always be used with an energy absorbing element. In some embodiments or aspects, the energy absorbing element may be a self-retracting lanyard (SRL), and in other embodiments or aspects may include a lanyard or a rope grab. The SRL is attached at one end to an anchor point and at its other end to a line directly connected to the user. The SRL is configured to activate once the user has begun to fall to arrest the fall soon enough to prevent injury to the user. Typically, an SRL has a housing with a rotatable drum having a line wound about the drum and a braking mechanism for controlling the rotation of the drum. The drum can rotate in a first direction to unwind (or “pay out”) the line from the housing when a certain level of tension is deliberately applied. When tension is reduced or released, the drum can slowly rotate in a reverse direction, thereby causing the line to retract or rewind onto the drum. The braking mechanism is configured for slowing down and stopping the rotation of the drum when the line unwinds too rapidly. For example, the braking mechanism may be activated to brake the rotation of the drum when the rotation speed exceeds a predetermined velocity. A sudden line pay out at a speed that exceeds normal payout is an indication that the user has experienced a fall that needs to be stopped or arrested. Should such an unintentional, accidental fall commence, the braking mechanism in the housing of the SRL is configured to engage and stop the user from falling too far.
Many falls occur over the edge of a working surface, causing the line of the SRL to bend over the edge. In such situations, the line is not moved relative to the edge, thereby imparting the entire force of a fall on a single point in the line at the edge. If an energy absorbing element is not positioned between the user and the edge, there is a risk that the user will be exposed to dangerously high forces caused by a sudden deceleration of the user's body as the user's weight is supported by the harness and a line attaching the user to the anchor point. Some full body harnesses have an energy absorbing element permanently attached to the D-ring on the user's back. This design. however, is often bulky and can interfere with the user's mobility. It also adds additional weight that the user must carry at all times.
Accordingly, there is a need in the art for an improved harness that addresses certain drawbacks and deficiencies associated with known harnesses. For example, there is a need for an improved harness with an improved energy absorbing element associated with the harness. There is a further need in the art for an improved harness that can be easily and effectively worn by the user in a variety of work environments without compromising the user's ability to move and without adding additional weight that must be borne by the user. There is also a need for an improved harness with increased safety compliance at the worksite, and with more effective and safe support of the user in the event of a fall.
Generally, provided is an improved fall protection harness having an integrated energy absorbing element. Preferably, provided is an improved harness having an energy absorbing element, such as a tearable webbing material. Preferably, provided is an improved harness that can be easily and effectively worn by the user in a variety of work environments without compromising the user's ability to move and without adding significant weight that must be borne by the user. Preferably, provided is an improved harness that not only leads to increased safety compliance at the worksite, but also provides increased effectiveness to the personal fall protection system and a resulting increase in the safety of the user in the event of a fall.
In some preferred and non-limiting embodiments or aspects, provided is a wearable harness having a plurality of straps, optionally including a first leg strap and a second leg strap, each leg strap having a first end and a second end removably attached to each other and configured to be free floating when detached from each other. The harness may optionally further include a belt strap having a first end and a second end removably attached to each other and configured to be free floating when detached from each other. The harness includes a shoulder strap having a first shoulder strap, and a second shoulder strap. One or both of the first shoulder strap and the second shoulder strap may have an energy absorbing element integrated therewith. The energy absorbing element may have a tubular webbing encasing a tearable webbing material with at least two bound (e.g., load-bearing) webbing components configured to tear from one another when the shoulder strap is subjected to a force that exceeds a predetermined threshold. Accordingly, the energy absorbing element may be integrated on or with at least a portion of at least one of the shoulder straps.
In other preferred and non-limiting embodiments or aspects, the energy absorbing element may be exposed from the tubular webbing at a substantially intermediate portion of at least one of the first shoulder strap and the second shoulder strap between the first end and the second end of the at least one of the first shoulder strap and the second shoulder strap. The energy absorbing element may be exposed from the tubular webbing through an opening in the tubular webbing. The opening may be a slit formed at a substantially intermediate portion of at least one of the first shoulder strap and the second shoulder strap between the first end and the second end of the at least one of the first shoulder strap and the second shoulder strap. At least a portion of the energy absorbing element may be configured to exit through the opening of the tubular webbing upon tearing. The tubular webbing may be made from a woven tubular material. The tubular webbing may be made from a substantially flat webbing material having opposing lateral ends connected to one another to define a tubular shape.
In other preferred and non-limiting embodiments or aspects, the at least two bound webbing components may be bound by a plurality of binder threads or an adhesive. The plurality of binder threads may be configured to tear successively in a longitudinal direction of at least one of the first shoulder strap and the second shoulder strap when the at least one of the first shoulder strap and the second shoulder strap is subject to the force that exceeds the predetermined threshold. The plurality of binder threads may extend through at least a portion of a thickness of the at least two webbing components. The plurality of binder threads may be arranged in a row, or two or more rows extending along a longitudinal length or a lateral length of the webbing components. The rows may be substantially parallel to each other or intersect with each other at least once over the longitudinal length or the lateral length of the webbing components. The plurality of binder threads may be arranged in two or more thread groups spaced apart from each other along a longitudinal length or a lateral length of the webbing components. The two or more thread groups may be arranged in a pattern. A density of the plurality of binder threads may increase from the rear portion to the front portion of the shoulder strap, or vice versa. The predetermined threshold may be in the range of about 310 lbs to about 2,250 lbs. The first shoulder strap and the second shoulder strap may have a starting tear area at the rear portion where the pair of bound webbing components is unbound. The first shoulder strap and the second shoulder strap may have an ending tear point having a reinforced area configured to prevent separation of the at least two bound webbing components. The energy absorbing element may be located on an energy absorbing area at the rear portion of at least one of the first shoulder strap and the second shoulder strap.
In other preferred and non-limiting embodiments or aspects, at least one connector may be arranged on at least one of the plurality of straps and configured to facilitate removable attachment of the free floating ends of at least one of the plurality of straps. The connector may be at least one of the following: a clip, a buckle, a mating arrangement, an attachment structure, or any combination thereof. The first end of each leg strap may be adjustably attached to the second end by a connection mechanism that can adjust the length of each leg strap. The harness may have a chest strap having a first end and a second end removably attached to each other and configured to be free floating when detached from each other. The first end of the chest strap may be attached to the first shoulder strap and the second end of the chest strap may be attached to the second shoulder strap. The harness may have a back strap connecting a rear portion of at least one of the first shoulder strap and the second shoulder strap.
In other preferred and non-limiting embodiments or aspects, a fall protection harness removably wearable by a user may have a plurality of straps, including an optional first leg strap, an optional second leg strap, and an optional belt strap. The fall protection harness includes a first shoulder strap and a second shoulder strap. One or both of the first shoulder strap and the second shoulder strap may have an energy absorbing element integrated therewith, the energy absorbing element comprising a tubular webbing encasing a tearable webbing material with at least two bound webbing components bound together by a plurality of binder threads configured to tear successively in a longitudinal direction of the first shoulder strap and the second shoulder strap when the first shoulder strap and the second shoulder strap are subjected to a predetermined force. The energy absorbing element may be exposed from the tubular webbing at a substantially intermediate portion of at least one of the first shoulder strap and the second shoulder strap between the first end and the second end of the at least one of the first shoulder strap and the second shoulder strap.
In other preferred and non-limiting embodiments or aspects, the first shoulder strap and the second shoulder strap may have a starting tear area at the rear portion where the pair of bound webbing components is unbound. The energy absorbing element may be located on an area at the rear portion of at least one of the first shoulder strap and the second shoulder strap. At least one connector may be arranged on at least one of the plurality of straps and configured to facilitate removable attachment of free floating ends of at least one of the plurality of straps. The connector may be at least one of the following: a clip, a buckle, a mating arrangement, an actuatable structure; or any combination thereof. The first end of each leg strap may be adjustably attached to the second end by a connection mechanism to adjust a length of each leg strap. The harness may have a chest strap having a first end and a second end removably attached to each other and configured to be free floating when detached from each other. The first end of the chest strap may be attached to the first shoulder strap and the second end of the chest strap may be attached to the second shoulder strap.
In other preferred and non-limiting embodiments or aspects, at least one strap of a harness may have a shoulder strap having tubular webbing encasing an energy absorbing element having a tearable webbing material with at least two bound webbing components bound together by a plurality of binder threads configured to tear successively in a longitudinal direction of the shoulder strap when the shoulder strap is subjected to a predetermined force. The energy absorbing element may be exposed from the tubular webbing at a substantially intermediate portion of the shoulder strap. In a harness removably attachable to a body of a user, at least one strap may have an energy absorbing element integrated with the at least one strap.
Further preferred and non-limiting embodiments or aspects will now be set forth in the following numbered clauses.
Clause 1: A wearable harness having a plurality of straps comprising: an optional first leg strap, an optional second leg strap, an optional belt strap, a first shoulder strap, and a second shoulder strap, wherein at least one of the first shoulder strap and the second shoulder strap comprises an energy absorbing element integrated therewith.
Clause 2: The harness of claim 1, wherein the energy absorbing element is a tubular webbing encasing a tearable webbing material with at least two bound webbing components configured to tear from one another when the shoulder strap is subjected to a force that exceeds a predetermined threshold.
Clause 3: The harness of clause 1 or 2, wherein the energy absorbing element is exposed from the tubular webbing at a substantially intermediate portion of at least one of the first shoulder strap and the second shoulder strap between the first end and the second end of the at least one of the first shoulder strap and the second shoulder strap.
Clause 4: The harness of any of clauses 1-3, wherein the energy absorbing element is exposed from the tubular webbing through an opening in the tubular webbing.
Clause 5: The harness of any of clauses 1-4, wherein at least a portion of the energy absorbing element is configured to exit through the opening of the tubular webbing upon tearing.
Clause 6: The harness of any of clauses 1-5, wherein the tubular webbing comprises a substantially flat webbing material having opposing lateral ends connected to one another to define a tubular shape.
Clause 7: The harness of any of clauses 1-6, wherein the at least two bound webbing components are bound by a plurality of binder threads.
Clause 8: The harness of any of clauses 1-7, wherein the plurality of binder threads are configured to tear successively in a longitudinal direction of at least one of the first shoulder strap and the second shoulder strap when the at least one of the first shoulder strap and the second shoulder strap is subjected to the force that exceeds the predetermined threshold.
Clause 9: The harness of any of clauses 1-8, wherein the plurality of binder threads extend through at least a portion of a thickness of the at least two webbing components.
Clause 10: The harness of any of clauses 1-9, wherein the plurality of binder threads are arranged in two or more substantially parallel or intersecting rows extending along a longitudinal length or a lateral length of the webbing components.
Clause 11: The harness of any of clauses 1-10, wherein the plurality of binder threads are arranged in two or more thread groups spaced apart from each other along a longitudinal length or a lateral length of the webbing components.
Clause 12: The harness of any of clauses 1-11, wherein the predetermined threshold is about 310 lbs to about 2,250 lbs.
Clause 13: The harness of any of clauses 1-12, wherein the at least two bound webbing components are bound together by an adhesive.
Clause 14: The harness of any of clauses 1-13, wherein the first shoulder strap and the second shoulder strap have a starting tear area at a rear portion where the pair of bound webbing components is unbound.
Clause 15: The harness of any of clauses 1-14, wherein the first shoulder strap and the second shoulder strap have an ending tear point having a reinforced area configured to prevent separation of the at least two bound webbing components.
Clause 16. The harness of any of clauses 1-15, wherein the energy absorbing element is located on an area at a rear portion of at least one of the first shoulder strap and the second shoulder strap.
Clause 17: A fall protection harness removably wearable by a user, the harness having a plurality of straps comprising: an optional first leg strap an optional second leg strap, an optional belt strap, a first shoulder strap, and a second shoulder strap, wherein at least one of the first shoulder strap and the second shoulder strap have an energy absorbing element integrated therewith, the energy absorbing element comprising a tubular webbing encasing a tearable webbing material with at least two bound webbing components bound together by a plurality of binder threads configured to tear successively in a longitudinal direction of the first shoulder strap and the second shoulder strap when the first shoulder strap and the second shoulder strap are subjected to a predetermined force, and wherein the energy absorbing element is exposed from the tubular webbing at a substantially intermediate portion of at least one of the first shoulder strap and the second shoulder strap between the first end and the second end of the at least one of the first shoulder strap and the second shoulder strap.
Clause 18: The harness of clause 17, wherein the first end of each leg strap is adjustably attached to the second end by a connection mechanism to adjust a length of each leg strap.
Clause 19: The harness of clause 17 or clause 18, wherein the energy absorbing element is located on an area at a rear portion of at least one of the first shoulder strap and the second shoulder strap.
Clause 20: In a harness removably attachable to a body of a user and having at least one strap comprising an energy absorbing element integrated with the at least one strap.
These and other features and characteristics of the present disclosure, as well as the methods of operation and functions of the related elements of structures and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention.
For purposes of the description hereinafter, the terms “end”, “upper”, “lower”, “right”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “lateral”, “longitudinal” and derivatives thereof shall relate to the invention as it is oriented in the drawing figures. However, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the invention. Hence, specific dimensions and other physical characteristics related to the embodiments disclosed herein are not to be considered as limiting.
As used in the specification and the claims, the singular form of “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. As used in the specification and the claims, the term “end” refers to the extreme distal portion or the area near or adjacent that portion. Unless otherwise specified, the use of the term “attach”, “attachable”, and/or “attachment” includes a permanent, semi-permanent, removable, or adjustable attaching arrangement. As used in the specification and the claims, the term “integrated”, when used with reference to an energy absorbing element and any portion of a harness, means that an energy absorbing element is formed as a separate component or arrangement and can be combined in, on, or with at least a portion of a separately formed harness (e.g., at least one strap or portion of a strap of the harness), such that the two components together constitute a whole. Therefore, the terms “therewith”, “therein”, and “thereon” are used interchangeably in the context of the present description. As used in the specification and the claims, the term “substantially parallel” means a relative angle as between two objects (if extended to theoretical intersection), such as elongated objects and including reference lines, that is from 0° to 5°, or from 0° to 3°, or from 0° to 2°, or from 0° to 1°, or from 0° to 0.5°, or from 0° to 0.25°, or from 0° to 0.1°, inclusive of the recited values.
As used in the specification and the claims, all ranges or ratios disclosed herein are to be understood to encompass any and all subranges or sub-ratios subsumed therein. For aspect or embodiment, a stated range or ratio of “1 to 10” should be considered to include any and all subranges between (and inclusive of) the minimum value of 1 and the maximum value of 10; that is, all sub-ranges or sub-ratios beginning with a minimum value of 1 or more and ending with a maximum value of 10 or less, such as but not limited to, 1 to 6.1, 3.5 to 7.8, and 5.5 to 10.
In various preferred and non-limiting embodiments or aspects, and with reference to
With continued reference to
In various preferred and non-limiting embodiments or aspects of the present disclosure, the leg straps 102 (or, indeed, any of the straps in the harness 100) may be linear lengths of material, folded straps that form loops with the at least one connector 104 at the first end 102a and/or the second end 102b, or the like. For example, as shown in
With continued reference to
The belt strap 110 is configured to encircle at least a portion of the user's torso. The belt strap 110 has a first end 110a that is attached to a first portion of a shoulder strap 126 and a second end 110b that is attached to a second portion of the shoulder strap 126. The first end 110a and the second end 110b may be removably or non-removably attachable to the shoulder strap 126. In some embodiments or aspects, at least one of the first end 110a and the second end 110b may be attachable to the shoulder strap 126 via a connector similar to the connector 104 described herein with reference to the leg straps 102. In some preferred and non-limiting embodiments or aspects, the belt strap 110 may have at least one connection mechanism 106 configured for adjusting the length of the belt strap 110. In this manner, the at least one connection mechanism 106 adjusts a distance between the first end 110a and the second end 110b such that the belt strap 110 may be adjusted to fit comfortably around the user's torso. One or more handle connection members, and other handling and/or connectors 120 may be provided on at least a portion of the belt strap 110. The belt strap 110 may have padding (not shown) for increasing the user's comfort while wearing the harness 100. The belt strap 110 may be formed from a substantially flat webbing material typically used in harness construction.
With continued reference to
With specific reference to
With continued reference to
As shown in
The harness 100 further may have a chest strap 132 having a first end 132a removably connectable to a second end 132b. The first end 132a of the chest strap 132 may be positioned proximate to the first end 127a of the first shoulder strap 126a, while the second end 132b of the chest strap 132 may be positioned proximate to the first end 129a of the second shoulder strap 126b. The first end 132a of the chest strap 132 is removably attachable to the second end 132b via a connector, similar to the connector 104 described herein with reference to the leg straps 102. In some preferred and non-limiting embodiments or aspects, the connector 104 may be a clip, a buckle, a mating arrangement, an actuatable structure, or the like. In this manner, the first and second ends 132a, 132b of the chest strap 132 are configured to be removably attached to each other and configured to be free floating when detached from each other. In some preferred and non-limiting embodiments or aspects, at least one of the back strap 130 and the chest strap 132 may have at least one connection mechanism, such as the connection mechanism 106 described herein with reference to the leg straps 102. The connection mechanism 106 is configured for adjusting the length of the back strap 130 and/or the chest strap 132. The back strap 130 and the chest strap 132 may be formed from a substantially flat webbing material typically used in harness construction.
With reference to
In some preferred and non-limiting embodiments or aspects, the shoulder strap 126 has an energy absorbing element 101 integrated therewith (shown in
In some preferred and non-limiting embodiments or aspects, the substantially flat webbing material 146 may be exposed from the tubular webbing 147 through an opening 149 in the tubular webbing 147 in an area where the substantially flat webbing material 146 is connected to the D-ring 138. As described herein, a first portion of the substantially flat webbing material 146 from each of the first shoulder strap 126a and the second shoulder strap 126b may be connected directly to the D-ring 138, while a second portion of the substantially flat webbing material 146 bypasses the D-ring 138. In this manner, the harness 100 does not differ externally from a conventional harness without the energy absorbing element 101, but incorporates the beneficial energy absorption element integrated into the harness 100.
With reference to
In various examples, the tubular webbing 147 may have an internal diameter of about 0.5 inches to about 2.0 inches. In various embodiments or aspects, a longitudinal length of the tubular webbing 147 may be between about 24 inches to about 90 inches. The opening 149 in the tubular webbing 147 may be formed at a substantially intermediate point between the first end 127a and the second end 127b of the first shoulder strap 126a (and/or the second shoulder strap 126b). In some preferred and non-limiting embodiments or aspects, the opening 149 may be formed at a rear portion of the harness 100 at an upper portion of a user's back. In this manner, the opening 149 allows the substantially flat webbing material 146 to be exposed such that the substantially flat webbing material 146 may be connected to the D-ring 138. The opening 149 may be formed as a slit in the tubular webbing 147 having a length between about 0.5 inches to about 2.0 inches. In one preferred and non-limiting embodiment, and upon activation of the energy absorbing element, e.g., the flat webbing material 146, at least a portion of the energy absorbing element is configured to exit through the opening 149 of the tubular webbing 147 upon tearing, thereby facilitating the complete (if necessary) separation of the flat webbing material 146. Further, it is envisioned that the opening 149 may be reinforced wholly or partially around its edges to ensure that the tubular webbing 147 does not rip or tear during a fall event.
With continued reference to
When the energy absorbing element is activated, such as during a fall event, the binder threads 148 are configured to be torn upon experiencing a force in excess of a predetermined force, thereby allowing the two webbing components 146a, 146b to tear apart from each other, such as shown in
As discussed above, and in another preferred and non-limiting embodiment or aspect, the webbing components 146a, 146b may be bound together by an adhesive, such as glue, that separates when reaching the minimum predetermined force or load. It is recognized that these adhesives may be specifically formulated to meet the separation requirements at the minimum predetermined force or load.
With reference to
With reference to
With continued reference to
The shoulder strap 126 having an energy absorbing element integrated therewith, such as the two webbing components 146a, 146b bound by binding threads 148, reduces the risk of misuse, especially in leading edge applications where the user may incorrectly attach an integrated energy absorbing element to a conventional harness. A harness 100 having such a shoulder strap 126 eliminates the need for a structural back-up strap as the tear tape maintains the static strength of structural webbing at full elongation (end of deployment shown in
Although the invention has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred embodiments, it is to be understood that such detail is solely for that purpose and that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the spirit and scope of the appended claims. For example, it is to be understood that the present invention contemplates that, to the extent possible, one or more features of any embodiment can be combined with one or more features of any other embodiment.
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