Ballasted fall prevention apparatus

Abstract

A rooftop safety system for protecting persons from falling off a rooftop environment by employing fall protection which may include a ballasted fall prevention apparatus, and a fall protection anchor coupled to the ballasted fall prevention apparatus. A fall protection anchor may include an attachment device adapted to couple the fall protection anchor to a structure, an anchorage connector adapted to connect personal fall protection equipment to the fall protection anchor to deploy fall restraint. In one embodiment, an integral strain indicator made of a degradable material is placed within the fall protection anchor, and after a certain amount of force indicative of a fall impact is reached, deforms giving a visual indication to safety inspectors that a fall event has occurred. In an alternative embodiment the strain indicator can be formed into a housing which covers an attachment device as well as the post the attachment device is attached to.

Claims

1. A rooftop safety system comprising: a ballasted fall prevention apparatus; and a fall protection anchor coupled to the ballasted fall prevention apparatus, the fall protection anchor further comprising: an attachment device adapted to connect personal fall protection equipment to the fall protection anchor, wherein the attachment device comprises a first end of a multi-hole link; an anchorage connector adapted to couple the fall protection anchor to the ballasted fall protection apparatus, wherein the anchorage connector comprises a second end of the multi-hole link; and an integral strain indicator comprising a shock absorber coupling the attachment device to the anchorage connector, wherein the shock absorber is flanked by two or more strain covers, wherein: the two or more strain covers are comprised of degradable material; and the two or more strain covers degrade when a force associated with a fall event is applied to the fall protection anchor.

2. The rooftop safety system of claim 1 wherein the ballasted fall prevention apparatus comprises a handrail system.

3. The rooftop safety system of claim 1 wherein the fall protection anchor comprises a fall arrest anchor.

4. The rooftop safety system of claim 1 wherein the fall protection anchor comprises a fall restraint anchor.

5. The rooftop safety system of claim 1, wherein the fall protection anchor is integral with the ballasted fall prevention apparatus.

6. A fall protection anchor comprising: an attachment device adapted to connect personal fall protection equipment to the fall protection anchor, wherein the attachment device comprises a first end of a multi-hole link; an anchorage connector adapted to couple the fall protection anchor to a ballasted fall protection apparatus, wherein the anchorage connector comprises a second end of the multi-hole link; and an integral strain indicator comprising a shock absorber coupling the attachment device to the anchorage connector, wherein the shock absorber is flanked by two or more strain covers, wherein: the two or more strain covers are comprised of degradable material; and the two or more strain covers degrade when a force associated with a fall event is applied to the fall protection anchor.

7. The fall protection anchor of claim 6, wherein the integral strain indicator is coupled between the attachment device and the anchorage connector.

8. The fall protection anchor of claim 6, wherein the degradable material is arranged within one of the holes.

9. A method comprising coupling personal fall protection equipment to a ballasted fall prevention apparatus by a fall protection anchor, the fall protection anchor comprising: an attachment device adapted to connect personal fall protection equipment to the fall protection anchor, wherein the attachment device comprises a first end of a multi-hole link; an anchorage connector adapted to couple the fall protection anchor to the ballasted fall protection apparatus, wherein the anchorage connector comprises a second end of the multi-hole link; and an integral strain indicator comprising a shock absorber coupling the attachment device to the anchorage connector, wherein the shock absorber is flanked by two or more strain covers, wherein: the two or more strain covers are comprised of degradable material, and the two or more strain covers degrade when a force associated with a fall event is applied to the fall protection anchor.

10. The method of claim 9 wherein the ballasted fall prevention apparatus comprises a handrail system.

11. The method of claim 9, wherein coupling personal fall protection equipment to the ballasted fall prevention apparatus comprises attaching personal fall protection equipment to the ballasted fall prevention apparatus via the fall protection anchor.

12. The method of claim 9 wherein coupling personal fall protection equipment to the ballasted fall prevention apparatus comprises: coupling the fall protection anchor to the ballasted fall prevention apparatus; and coupling personal fall protection equipment to the fall protection anchor.

13. The method of claim 9 wherein the personal fall protection equipment includes a tie-off apparatus.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1: A schematic block diagram of an embodiment of a system for rooftop safety according to the inventive principles of this patent disclosure.

(2) FIG. 2: An isometric view (top of FIG. 2) from edge of the rooftop of the Ballasted Fall Arrest Guard Rail System and a detail view (bottom of FIG. 2) of the attachment device for a personal safety harness and lanyard. (a) Horizontal Top Rail, (b) Ballast Material, (c) Vertical Structure Post, (d) Attachment Device, (e) Vertical Rods.

(3) FIG. 3: An isometric view from the interior of the rooftop of the system frame with the ballast weight and other rooftop materials omitted for clarity.

(4) FIG. 4: A top view of strain indicator embodiment one, the strain insert, situated inside the anchor point. Only the portion of the anchor point extending past the safety rail is shown (indicated by line break).

(5) FIG. 5: An isometric view from the edge of the rooftop of strain indicator embodiment, the strain cover, fastened around the attachment device. The strain indicator material is shown in grey.

(6) FIG. 6: An exploded perspective view showing the anchorage point hooking around the ballasted fall prevention apparatus' post with strain covers flanking a strain indicator. The rest of the fall prevention apparatus is omitted for clarity.

(7) FIG. 7: An anterior view of the four lugs attached to the top and bottom ends of each of the two strain covers.

(8) FIGS. 8A-8E: Various views of the strain covers including 8A Top, 8B Back, 8C Interior, 8D Front and 8E Interior.

(9) FIG. 9A: An anterior view of the post and Ballasted Fall Prevention Apparatus.

(10) FIG. 9B: A posterior view of the post and Ballasted Fall Prevention Apparatus.

(11) FIG. 9C: A left side view of the post and Ballasted Fall Prevention Apparatus.

(12) FIG. 10: A view of the Ballasted Fall Prevention Apparatus in use during work by maintenance personnel.

DETAILED DESCRIPTION

(13) A rooftop safety system 100 designed for protecting persons from falling off a rooftop by serving as a barrier to fall hazards as well as providing a fall protection anchor 104 for authorized personnel operating outside the guard rail, along the periphery of the rooftop. In one embodiment, a block diagram FIG. 1 illustrates a rooftop safety system (“RSS”) 100 which includes a ballasted fall prevention apparatus 130 and a fall protection anchor 104 coupled to the ballasted fall prevention apparatus 130. The ballasted fall prevention apparatus 130 is designed to both prevent fall events through tie-off systems and halt fall events in progress through the attachment of personal fall protection equipment 112 to the fall protection anchor 104. The fall protection anchor 104 includes an attachment device 106 and an anchorage connector 108, with a shock absorber 110 in between them, covered by a strain indicator 120 made up of strain covers 111, 113. Personal fall protection equipment 112 may be connected to the attachment device 106. The fall protection anchor 104 couples with the ballasted fall prevention apparatus 130 which supports the weight of impact from falls via ballast material placed in a frame of ballast trays (not shown).

(14) The RSS is a novel rooftop safety apparatus designed to integrate the functionality of multiple rooftop safety features in one installation. The RSS eliminates the need for perforations of rooftop waterproof membranes by utilizing ballast weight to affix the guard rail or handrail upright. By utilizing the vertical structure posts (element c in FIG. 2) as anchor points, The RSS eliminates the need for additional fixed anchor posts to be installed around the periphery of the rooftop. This fixed system also offers advantages over portable dead-weight fall arrest systems since it eliminates setting up and taking down weighted anchor points each time a person needs to work on a different section of the rooftop edge.

(15) In the preferred embodiment the RSS is fabricated in modular sections. These steel sections are made of a horizontal top bar (element a in FIG. 2) coupled to vertical structure posts and vertical rods (element e in FIG. 2) integrated into the system frame, which is composed of steel ballast trays and steel support feet (FIG. 3). Ballast material (element b in FIG. 2) of sufficient weight which may include soil, gravel, vegetation, and paving slabs are placed in the steel trays to secure the RSS sections in place.

(16) The system frame can also take on many different forms. For example, it can be a circular base over which ballast material is placed or simply long horizontal rods which increase the stability of the RSS. Any similar forms of ballasted frames not mentioned explicitly, but common in usage, are contemplated within this specification.

(17) The attachment device (element d in FIG. 2) is fixed mounted on the vertical structure posts so it cannot be removed, relocated, or repositioned. Here, the attachment device includes a first (outer) end of a multi-hole link and the anchorage connector includes a second (inner) end of the multi-hole link. Attachment devices are periodically placed along vertical structure posts. They are oriented so that the attachment device extends outwards towards the edge of the building. This enables persons who need to work outside the guard rail to connect lanyards at these points and thus safely work without tangling of said lanyards. These attachment devices are designed for carabiners, or a similar device, to be attached to a personal fall arrest harness and clip into an eyelet on the device.

(18) Since the torque on the vertical structure post increases linearly with the vertical positioning of the attachment device, it is ideal to place the attachment device as low as possible on the post, thus minimizing both the amount of ballast material required and diameter and thickness of the vertical structure posts. However, due to ergonomics such as desiring visibility and not requiring workers bend over as low, the attachment device is optimally positioned approximately 4 inches above the ballast material (FIG. 2). However, depending on how fortified the System is, in terms of ballast weight and the overall strength of the structure posts, the vertical positioning of the attachment device can be adjusted accordingly.

(19) Alternatively, the attachment device can take the form of a taut wire or rod which is secured between the vertical structure posts. Again, this embodiment of the attachment device is optimally positioned approximately 4 inches above the ballast material but can be adjusted based on how fortified the System is. The advantage of using a taut wire or rod is that persons working along the periphery of the rooftop can connect their personal fall arrest gear to the attachment device and gain an additional degree of linear motion along the segment between posts versus an attachment point at a fixed location.

(20) Due to potential loss of life, there are numerous safety regulations in the field of personal fall arrest equipment. OSHA 1926.502(d)(19) requires that “Personal fall arrest systems and components subjected to impact loading shall be immediately removed from service and shall not be used again for employee protection until inspected and determined by a competent person to be undamaged and suitable for reuse.” In short, prior to each use and upon any time of fall “event” the apparatus must be thoroughly inspected.

(21) For this reason, the apparatus also can incorporate a feature to visually notify personnel inspecting it whether a fall event has occurred. The feature utilizes a material (“Strain Indicator”) that will noticeably deform after, but not before, a certain amount of force representative of a person falling off the rooftop or substantially similar “impact loading” is applied to the System. In one embodiment, FIG. 4, the Strain Indicator can be formed such that it fits into the portion of the attachment device where fall arrest gear, such as a carabiner, would attach to it. This “Strain Insert” can be adapted so that it has flanges that rest atop the attachment device. These flanges, in addition to more securely positioning the Strain Insert in place via gravitational forces, also increase the visibility of the material should a deformation occur than if the insert was simply positioned within the eyelet the carabiner attaches to. FIG. 4 includes (A) Attachment Device, (B) Strain Insert, (C) Internal Ring of Attachment Device, and (D) Strain Indicator Material. The strain indicator material is shown in grey.

(22) FIG. 5 is an isometric view from the edge of the rooftop of strain indicator embodiment, the strain cover, fastened around the attachment device. Components include (A) Attachment Device, (B) Strain Cover, (C) Vertical Structure Post, and (D) Strain Indicator Material. The strain indicator material is shown in grey.

(23) Also incorporated in the design of the fall protection anchor is an integral degradable strain indicator material which in one embodiment is placed inside the attachment device which, after a certain amount of force indicative of a fall impact is reached, deforms giving a visual indication to safety inspectors that the system requires a thorough inspection. In an alternate embodiment the strain indicator can be formed into a housing which covers an attachment post and a portion of vertical structural post via one or more strain covers. These strain covers add the benefit of increasing the visible area of the strain indicator material in addition to ensuring that the orientation and location of the attachment device on the vertical structure post has not been tampered with or degraded after impact loading. This embodiment may be advantageous for more robust monitoring of potential damage to the attachment device and thus fall events. This monitoring is done by the strain covers being frangible, which may be easily degraded. The strain covers/strain indicator may be made of a composite material or other material such as Glass Fiber Reinforced Polymer (GFRP).

(24) In one embodiment, FIG. 6, the anchorage connector 108 connects to the Ballasted Fall Prevention Apparatus 130 via a hook 101 which may be welded. The anchorage connector 108 is connected to the attachment device 106 and shock absorber 110 which may be coiled. Personal fall protection equipment 112 can be attached to the anchorage connector 108 via attachment device 106 and tie off points 116 as indicated. Two strain covers 111, 113 flank the shock absorber 110. When assembled, the strain covers 111, 113 become a strain indicator 120. On the inside of each strain cover 111, 113 is an integral hollow tube 114 to house the shock absorber 110. A nut 119 and bolt 118 secure the strain covers 111, 113 to the shock absorber 110. Other fasteners such as buckles may also be used. The rest of the ballasted fall prevention apparatus 130 is omitted for clarity.

(25) FIG. 7 is an anterior view of the four lugs 200 which attach to the two strain covers (at the top and bottom ends of each of the two strain covers). A hole 202 allows for insertion of the nut and bolt to secure the strain covers together. Other fasteners such as buckles may be used.

(26) The strain covers are further detailed in FIG. 8 showing various views including elements (A) front view, (B) back view. (C) bottom view, (D) top view and (E) interior view. (E) also shows showing the lugs 200 at the top and bottom of the figure (refer to FIG. 7). A hollow tube 114 is at the center of the cover from which seven leading support ribs 115 radiate. Cut-out portions 117 allows the strain covers to secure over the strain indicator.

(27) The assembled apparatus is viewable in different ways. FIG. 9 shows elements (A) front, (B) posterior and (C) left side views of the Ballasted Fall Prevention Apparatus 130 including strain covers 111, 113 which combine to make strain indicator 120. Attachment device 106 is also shown.

(28) FIG. 10 is a view of the Ballasted Fall Prevention Apparatus in use, with the attachment device portion of the Ballasted Fall Prevention Apparatus connected to a maintenance worker via personal safety equipment. The maintenance worker is working on the rooftop edge, beyond the fall protection barrier.

(29) Since the inventive principles of this patent disclosure can be modified in arrangement and detail without departing from the inventive concepts, such changes and modifications are considered to fall within the scope of the following claims.