Various embodiments relate generally to fall-protection systems.
Fall-protection safety harnesses are widely used in today's industrial world. Many occupations require workers to operate at great heights. These workers perform functions demanded by our modern world. Some examples of such occupations include bridge inspectors, high-rise construction operators, skyscraper window washers, etc. Individuals who work in such occupations require safety measures that are robust. But the safety equipment that is necessary must also permit the workers to accomplish the tasks at hand. It would be impractical, for example, if the safety measures were robust, but the safety equipment which accomplishes that measure of safety were so heavy as to render the worker immobile.
Companies who employ individuals to work at dangerous heights also have a concern for their well-trained employees. Such companies truly desire their employees to use the appropriate safety products, and to use them correctly. Thus, companies desire to use equipment that is easy to employ, and comfortable to wear. The easier such equipment is to use, the more likely the employee will use it properly. Furthermore, the more comfortable such equipment is to wear, the more likely an employee will wear it. Finally, if safety equipment is made to be easy to use, it becomes unlikely that the equipment will be accidentally misused.
Apparatus and associated methods may relate to a Self-Retracting Lifeline Connecting System (SRLCS) that securely attaches to a fall-protection safety harness, and further provides connections to a plurality of safety devices. In an illustrative example, the SRLCS may include a D-pad adapted for rear attachment to a back-pad of a safety harness. In some examples the D-pad may have webbing apertures through which two sections of webbing may be threaded in a criss-crossed manner. In some embodiments, the D-pad may provide an attachment for a first harness ring. In some exemplary embodiments, the D-pad may also provide a tunnel structure for routing a second harness ring therethrough. In an illustrative example, the tunnel may be located immediately adjacent to the criss-cross location of the two sections of webbing, thereby permitting a carabiner to make use of the tunnel to capture the two sections of webbing.
Various embodiments may achieve one or more advantages. For example, in some embodiments, where the tunnel is rigidly fixed to the D-pad, the weight of any attached safety equipment may substantially reduce or eliminate pulling on the webbing that tends to make the webbing sag. For example, the weight of attached equipment may be substantially supported by the rigid tunnel structure. Various embodiments may permit both carabiner and D-ring attachments to the webbing, the D-ring being available for a rescue hook attachment in the event of a fall. In another exemplary embodiment the tunnel structure may ease the capture of the webbing by a carabiner, because the tunnel may present an introduction behind the webbing to the open end of a carabiner. Some embodiments may employ a webbing retainer clip to help center the carabiner on the D-pad. Various embodiments may use a large webbing aperture of the webbing retainer clip to permit the webbing to readily slide as needed during operation. In some embodiments, the webbing is retained with a rotatable webbing retainer clip that substantially opposes/avoids any tendency to open the gate during a fall. In such a fall event, the webbing retaining clip may release from the carabiner, but because its rotation may oppose that of the first action of the carabiner's gate, any tendency to open the gate may be substantially reduced or minimized. In some embodiments, the use of SRL bushings may prevent or substantially reduce abrasion of the carabiner by the SRL swivel connectors.
The details of various embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will be apparent from the description and drawings, and from the claims.
a-1c depict a sketch of a field implementation of an exemplary Self-Retracting Lifeline Connecting System (SRLCS) used for fall protection.
a-2b depict two perspective views of a safety harness with an exemplary SRLCS with dual Self-Retracting Lifelines (SRLs) connected.
a-3b depict two close-up perspective views of a safety harness with an exemplary SRLCS showing a webbing tunnel.
a-4b depict two plan views of two exemplary D-pads.
a-5c depict a perspective and two side views of the installation of an exemplary D-pad clip used to create a webbing tunnel.
a-6d depict perspective, plan, top, and side views of an exemplary D-pad clip used to create a webbing tunnel.
a-7b depict two close-up perspective views of an exemplary SRLCS showing an exemplary webbing retainer clip.
a-9d depict a perspective view and plan views of an exemplary two-piece SRL bushing and side cross-sectional views of each bushing piece.
Like reference symbols in the various drawings indicate like elements.
To aid understanding, this document is organized as follows. First, an exemplary SRLCS is briefly introduced with reference to
a-1c depict a sketch of a field implementation of an exemplary Self-Retracting Lifeline Connecting System (SRLCS) used for fall protection. In these figures, a workman 100 is working high above a river 105. The workman is depicted wearing an exemplary SRLCS 110. The SRLCS has two exemplary Self-Retracting Lifelines (SRLs) 115, 120 attached to the SRLCS 110. Each SRL has a connection device 125, 130 which is attached to a girder 135 at two attachment locations 140, 145. The SRLs 115, 120 are attached to the SRLCS 110 via a carabiner 150. In this example, the carabiner 150 captures a webbing 155 of a harness 160. In various examples, the weight of the two SRLs 115, 120 may not cause the webbing 155 to sag because the carabiner 150 supporting the SRLs 115, 120 is attached to a D-pad 165 in the harness 160 via a D-pad clip 170. The D-pad clip 170 provides a tunnel 175, throughout which the carabiner 150 resides. The D-pad clip 170 is rigidly attached to the D-pad 165 which has webbing slots that guide the webbing 155 in a criss-cross fashion 180 over the D-pad clip. The tunnel 175 not only supports the weight of the carabiner 150 and the two SRLs 115, 120, but also provides a pathway to receive and guide the carabiner 150 behind the webbing 155, which ensures easy and proper installation. The carabiner's use of the tunnel pathway 175 provided by the D-pad clip 170 can be used in addition to a D-ring 185, which may then be available if a rescue hook is needed. The D-ring 185 can then be free of the heavy SRLs 115, 120 so that it doesn't cause the webbing 155 to sag, and its aperture is free for emergency use.
a-2b depict two perspective views of a safety harness with an exemplary SRLCS with dual Self-Retracting Lifelines (SRL) connected. In
a-3b depict two close-up perspective views of a safety harness with an exemplary SRLCS showing a webbing tunnel. In
a-4b depict two plan views of two exemplary D-pads. In
In
a-5c depict a perspective view and two side views of the installation of an exemplary D-pad clip used to create a webbing tunnel. In
a-6d depict perspective, plan, top, and side views an exemplary D-pad clip used to create a webbing tunnel. In
a-7b depict two close-up perspective views of an exemplary SRLCS showing an exemplary webbing retainer clip. In
a-9d depict a perspective view and plan views of an exemplary two-piece SRL bushing and side cross-sectional views of each bushing piece. In
Although various embodiments have been described with reference to the figures, other embodiments are possible. For example, a flexible D-pad may be used along with a semi-rigid D-pad clip. In some embodiments, a D-pad may be semi-rigid and a rigid or semi-rigid D-pad clip may be affixed to it. In various embodiments, a tunnel created by a D-pad clip may be made longer or shorter. Some exemplary embodiments may integrate the D-pad clip into the D-pad itself. In accordance with another embodiment, a D-pad clip may have two parallel tunnels presenting the user with a choice of tunnels to use. In another embodiment, a D-pad clip may provide for connection of a D-ring in addition to providing a tunnel.
In various embodiments, apparatus and methods may involve webbing retainer clips made of plastic. In another exemplary embodiment the webbing retainer clip may be secured to the carabiner with one or more screws or bolts. In accordance with another embodiment, the webbing retainer clip may be made with second and third attachment points that connect to a D-pad clip instead of or in addition to connecting to a carabiner. In an exemplary embodiment, single piece SRL bushings may be used. These bushings may snap into the swivel connection from one side of the swivel connection aperture. In accordance with another embodiment, the bushings may be made of a material with an embedded lubricant, such as graphite.
In one exemplary aspect, a method of constructing a fall-protection safety harness includes providing a wearable safety harness including a length of webbing, providing a D-pad having a top and a bottom surface, the D-pad including webbing apertures for attachment to a webbing, providing a D-pad clip attachable to the D-pad, the D-pad clip providing a lumen located adjacent to the top side of the D-pad at or near the location of the location of the webbing criss-cross and oriented about approximately parallel to the top surface of the D-pad, and inserting at least a portion of the length of the webbing through the webbing aperture to securely couple the unitary solid body to the safety harness.
A number of implementations have been described. Nevertheless, it will be understood that various modification may be made. For example, advantageous results may be achieved if the steps of the disclosed techniques were performed in a different sequence, or if components of the disclosed systems were combined in a different manner, or if the components were supplemented with other components. Accordingly, other implementations are contemplated.