A zipline trolley brake system comprising trolley rollers, brake rollers, and an arm for controlling the brake rollers, which are connected by a plurality of connectors. The trolley slows and brakes when the arm causes a squeezing motion on the cable by the joint rolling of the trolley rollers and the brake rollers on the cable. The trolley moves when the arm moves to cause the brake rollers not to touch the cable.

The zip line rail system can be connected to a challenge course, a zip line, a zip track system, or any combination thereof. The zip line rail system of the present invention can have two rails that a member slide's two wheels rollably engage with, and the zip line rail system can be configured in any of a variety of directions.

An emergency arrest device for a zip line is disclosed. The emergency arrest device is designed to tension and control a slide-and-grip knot, such as a Prusik knot, that is tied on the zip line. The device includes a mirror-image set of sidewalls, a front endwall connected between the pair of sidewalls at a front end of the device, and a rear endwall connected at a rear end of the device. The front and rear endwalls have openings sized to permit passage of the zip line therethrough. A tail fixation assembly including a clamp is mounted in the rear of the device. A knot-body control assembly is mounted in the front of the device. The knot-body control assembly includes arms that are resiliently biased to push the body of the slide-and-grip knot rearwardly when the device is impacted.

An emergency arrest device for a zip line is disclosed. The emergency arrest device is designed to tension and control a slide-and-grip knot, such as a Prusik knot, that is tied on the zip line. The device includes a mirror-image set of sidewalls, a front endwall connected between the pair of sidewalls at a front end of the device, and a rear endwall connected at a rear end of the device. The front and rear endwalls have openings sized to permit passage of the zip line therethrough. A tail fixation assembly including a clamp is mounted in the rear of the device. A knot-body control assembly is mounted in the front of the device. The knot-body control assembly includes arms that are resiliently biased to push the body of the slide-and-grip knot rearwardly when the device is impacted.

A linear-motion brake system uses a fixed block, a moving block, and a linear-motion resistance assembly to decelerate a user who is tethered to the system via a force-transfer line. The linear-motion resistance assembly is a compressible component that exerts a force on the force-transfer line that opposes the force generated by the user traveling along a zipline. The moving block and the fixed block are positioned on opposite sides of the linear-motion resistance assembly, such that the moving block compresses the linear-motion resistance assembly when impelled by the force-transfer line. The force transfer line is threaded through a pair of guide channels that run along the linear-motion resistance assembly. One end of the force-transfer line is tethered to the fixed block while the opposite end is tethered to the user. Thus, the user's motion is transferred to the moving block and resisted by the linear-motion resistance assembly.

A linear-motion brake system uses a fixed block, a moving block, and a linear-motion resistance assembly to decelerate a user who is tethered to the system via a force-transfer line. The linear-motion resistance assembly is a compressible component that exerts a force on the force-transfer line that opposes the force generated by the user traveling along a zipline. The moving block and the fixed block are positioned on opposite sides of the linear-motion resistance assembly, such that the moving block compresses the linear-motion resistance assembly when impelled by the force-transfer line. The force transfer line is threaded through a pair of guide channels that run along the linear-motion resistance assembly. One end of the force-transfer line is tethered to the fixed block while the opposite end is tethered to the user. Thus, the user's motion is transferred to the moving block and resisted by the linear-motion resistance assembly.

A method and system enabling a process for preventing a vehicular accident is provided. The method includes continuously monitoring vehicular impact conditions associated with a vehicle in motion. In response, an imminent impact event associated with the vehicle in motion and an external object is detected and a surface of a roadway below the vehicle in motion is scanned by sensors of the vehicle. Results of the scanning indicate that the roadway surface is safe for deployment of a destructive friction based braking mechanism of the vehicle. The destructive friction based braking mechanism is deployed with respect to a first braking force threshold and it is determined if rate of speed decrease exceeds a specified speed decrease threshold.

A retractable lifeline assembly includes a housing including a sidewall, a rotatable member inside the housing, a first engaging mechanism coupled to the rotatable member, and a crank including a crank handle and a second engaging mechanism. The crank is pivotally coupled to the sidewall such that the crank is selectively movable between a first crank position, in which the second engaging mechanism is engaged with the first engaging mechanism, and a second crank position, in which the second engaging mechanism is disengaged from the first engaging mechanism. The crank handle selectively engages the first engaging mechanism when the crank is in the first crank position to rotate the rotatable member.

The current subject matter describes a device and system including one or more movable arms containing one or more magnets that are caused to move relative to a non-ferrous material by motion of the device to generate eddy currents that cause a braking of the device. Devices of this disclosure may include one or more trolleys that moving along a coaster track and which contain braking arms having magnets that move due to inertial force and/or can be controlled by a remote server computer based on information obtained from the one or more trolleys as they move along the coaster track.

A load lowering descent controller having a fixed cylindrical body or capstan about which a rope or cable is turned. The descent controller allows for lowering of the load at a controlled rate by adjusting the amount of friction between the controller and the rope or cable as a function of rope or cable turning and relative contact with rope or cable engagement surfaces in the controller. The fixed cylindrical body or capstan is surrounded by a vented sleeve to prevent the rope from becoming heated and to prevent the user from being injured.