The present application relates to the technical field of linkage mechanisms, and provides a linkage operation assembly, a fall protection device and a fall protection system. The linkage operation assembly includes a fixed main body configured to be installed on an outer support surface of a rail and move along the rail; a second wheel body assembly installed on the fixed main body for rolling along an inner support surface of the rail and including a second wheel set and a drive rotary shaft; a third wheel body assembly installed on the fixed main body for rolling along an inner support surface of the rail and including a third wheel set and a driven rotary shaft; and a linkage member disposed between the drive rotary shaft and the driven rotary shaft. When the drive rotary shaft of the linkage operating assembly rotates, the second wheel set is driven to rotate, and the driven rotary shaft and the third wheel set are driven to rotate through the linkage member. Therefore, during the installation process of the linkage operation assembly, only the drive rotary shaft needs to be rotated to switch the state of the linkage operation assembly, so as to facilitate the installation of the linkage operation assembly. Similarly, when the linkage operation assembly is disassembled, only the drive rotary shaft needs to be rotated.

Disclosed herein is an apparatus for preventing a user from moving beyond a first distance from a support structure. The apparatus comprises an extension member, comprising a first end and a second end that is opposite the first end. The first end is configured to be fixed to the support structure. The second end is movable relative to the first end along a plane and the second end is configured to extend away from the first end to an extended position and retract from the extended position towards the first end to a retracted position. The apparatus also comprises a flexible tether, having a fixed length and comprising an anchor end, attached to the second end of the extension member, and a user end, configured to attach to a user. The extended position is no more than a second distance away from the first end. The sum of the fixed length and the second distance is less than the first distance.

A davit assembly comprises a vertical structural column connecting a horizontal structural beam between a longer forward beam portion and a shorter rearward beam portion thereof, an angled support brace tensioned between a lower region of the structural column and an end of the shorter rearward beam portion and a primary rigging anchor slidably engaging the forward beam portion.

A connector includes a first ring with a blocker collaborating with a rod. The rod is movable between a first position where the first ring is closed and a second position where the first ring is open. The blocker is movable between a first position collaborating with the rod to keep the first ring closed and a second position allowing opening of the first ring. A second ring includes a probe. The probe is connected to the blocker. When the distance between the probe and the sliding area is greater than a threshold value, the probe prevents opening of the first ring by the blocker. When the distance between the probe and the sliding area is smaller than the threshold value, the probe allows opening of the first ring by the blocker.

In some embodiments, an anchoring stick comprises a shaft, a handle located at one end of the shaft and a hook located at the other end. The hook defines a cavity. The anchoring stick has a first orientation and a second orientation. A perimeter of the cavity comprises an opening in the first orientation. The cavity is defined by a closed perimeter in the second orientation.

A connection device comprises a connector forming a ring with an open position and a closed position. A handle is fixed to the connector and has two extensions receiving a user's hands. The handle defines a tube extending in a first direction and a through hole arranged to pass through the tube perpendicularly to the first direction. A first end of a wire member forms a loop fixed to the connector in the tube. The second end of the wire member is fixed to the user. The connector passes through the through hole and the loop to fix the handle and the wire member to the connector.

A telescopic ladder system includes a lower base configured to be connected to a ladder-supporting portion of a vehicle, and a ladder including a base section and a fly section operatively connected to the base section and slidable relative thereto. A supporting member is disposed at a distal end of the fly section. A security railing is connected to the distal end. The ladder has an attachment point for attaching a safety line thereto. The attachment point is disposed at one of the fly section, the supporting member and the security railing. A first actuator selectively sets an inclination angle of the ladder relative to the lower base. A second actuator selectively extends the ladder by sliding the fly section relative to the base section. A safety system and a method for securing an operator atop a vehicle or van are also contemplated.

Sub-surface roof attachment systems, methods, etc., configured for anchoring a personal fall protection anchorage device to a roof, the sub-surface roof attachment system comprising an anchor point base plate sized and configured for attachment to an upper surface of a support substrate, wherein the anchor point base plate is configured to immobily hold the personal fall protection anchorage device to the support substrate adequate for safe fall protection for a worker, the anchor point base plate further comprising an upwardly extendible adjustment bolt, an upper surface of the upwardly extendible adjustment bolt having a cavity therein configured to immobily receive and hold the personal fall protection anchorage device.

A fall arrest assembly for anchoring a fall arresting line to a pair of roof trusses includes a truss mount that has a pair of channels each being integrated into the truss mount. The pair of channels is oriented parallel with respect to each other to insertably receive a beam of a respective one of a pair of roof trusses thereby mounting the truss mount to the pair of roof trusses. An anchor box is integrated into the truss mount and the anchor box has an anchor point which is integrated into the anchor box. In this way the anchor point can have a fall arresting line attached to the anchor point thereby facilitating the fall arresting line to be mounted to the pair of roof trusses.

An expansion bolt and pivot and swivel mechanism therefor. The expansion bolt may have a base and a plurality of radially spreadable elongate elastic members cantileveredly projecting from the base at respective points of joinder to the base and terminating in respective spoons at respective points of joinder of the spoons, wherein the elongate elastic members have respective radially defined thicknesses at the points of joinder to the base that are substantially less than the corresponding thicknesses of the base, and respective radially defined thicknesses at the points of joinder of the spoons that are substantially less than the corresponding thicknesses of the spoons. The pivot and swivel mechanism may have a ring element that includes two spaced apart leg members having foot portions that turn to extend toward each other, the foot portions having respective, spaced-apart relatively enlarged ends; a swivel housing element having an open end for receiving and at least partially containing the ends of the foot portions so that the ring element can be substantially freely rotated about a pivot axis; and a capping element adapted for interlocking with the open end of the swivel housing element, the capping element having a bottom surface portion of radial symmetry about a swivel axis that is distinct from the pivot axis.