Patent Application
20160206903
The invention relates generally to safety harnesses, and in particular to harnesses used for fall arrest. The current state of the art in fall arrest harnesses utilizes a primary fall arrest attachment point at the dorsal location. The dorsal location provides for optimal transfer of energy during the arrest of the falling person and is the required location for the primary fall arrest attachment point in several industry standards governing the typical user of a fall arrest harness.
A significant negative side effect of arresting a fall from the dorsal location is the difficulty of self-rescue. The inability to reach and manipulate a loaded dorsal attachment point necessitates rescue of the fallen worker by others. Any delay in rescue can lead to medical complications from the suspension from the dorsal location, which on some occasions has occurred in a manner of minutes depending on the worker and the design of the harness worn. The ability to transfer the suspension point from the dorsal location to a more advantageous location is therefore desirable. Previous designs have allowed for either automatic or manual transfer of the suspension point, but the transfer was not controllable. An automatic transfer can, depending on the deployment, result in arresting the fall in an undesirable location with potentially harmful energy transfer. A manual transfer, if uncontrolled, can result in a secondary fall and arrest with additional forces to the body. Consequently, a need exists for an improved fall arrest harness design that addresses the drawbacks of prior harnesses.
The present invention is directed to a fall arrest harness and method of manually and controllably transferring the suspension point from a dorsal location to a more advantageous location. This harness and method ensures an initial arrest at the dorsal location for optimal transfer of energy into the body, and a smooth transfer of suspension without a secondary fall and arrest. The method may be one of several designs, and may be easily accessed and operated by the user of the harness. The harness comprises left and right shoulder sections, left and right leg sections, a chest section, buttocks section and a dorsal release strap. The harness further includes a repositioning tether which connects a fall arrest attachment point to a secondary location at the front of the harness.
A function of the present invention is to provide a controllable means of transferring the suspension point from the dorsal location to a more advantageous location in order to relieve the conditions leading to potential medical complications until rescue of the fallen person can be affected.
In
The harness 10 further includes a chest section 38 which extends through a buckle 40 for tightening the chest section around the wearer. The ends of the chest section 38 are sewn onto the shoulder section strapping. The harness further includes a sub-pelvic strap 44 which is a segment of strapping sewn to each of the leg sections. The harness further includes a primary fall arrest attachment point 46 which is attached to the harness 10 via a dorsal release strap 48 and a repositioning tether 50. For example, attachment point 46 may be a D-ring.
In a first embodiment shown in
The repositioning tether 50 is affixed to the attachment point 46 at one end 66 and at an opposite end 68 to the front of the harness by either a waist strap 70 as shown in
The dorsal release strap 48 has sufficient length (tail) to allow the strap to be let out through the friction device 30 until the tension from the user's weight has been transferred from the dorsal release strap to the repositioning tether 50 thus preventing any free and unrestricted movement of the dorsal release strap and thereby preventing a secondary fall and arrest.
Transfer of the suspension point is accomplished by the user manipulating the friction device 30 at the hip location by pulling on strap 72. This location provides the user optimal leverage for manipulating the friction device, even if injured in the initial fall. The design of the friction device 30 allows the user to progressively reduce the friction on the dorsal release strap by pulling on strap 76 which disengages the friction device thereby controlling the rate at which the transfer is affected. Once the tension of the user's weight has been transferred to the repositioning tether 50, the user can manually feed the remaining tail of the dorsal release strap through the friction device. This allows a full release of the primary fall arrest attachment point 46 from the dorsal location of the harness, completely transferring the suspension of the user to the more advantageous location.
Although the present invention has been disclosed with respect to embodiments thereof, it is to be understood that changes and modifications can be made therein which are within the intended scope of the invention as hereinafter claimed.
This application claims the benefit of and priority to U.S. Provisional Application No. 62/104,016 filed Jan. 15, 2015, the entire contents of which are incorporated herein by reference
| Number | Date | Country | |
|---|---|---|---|
| 62104016 | Jan 2015 | US |
