Abstract: A carriage includes a frame comprising: a first portion configured to slidably secure to a track; and a second portion coupled to the first portion and configured to automatically rotate with respect to the first portion depending on a position of the frame on the track; and a plurality of moving elements secured to the frame.

Abstract: A method of using a material hoist system includes slidably moving a carriage of the material hoist system with respect to a track, movement of the carriage with respect to the track driven by a drive of the material hoist system; and stopping the movement of the carriage automatically when a motor controller of the drive senses: a current of the drive that reaches a current threshold; and a rotational speed of the drive that reaches a rotational speed threshold.

Abstract: A material hoist system includes a drive; and a carriage, wherein the drive is configured to be coupled to the carriage and to move the carriage of with respect to a track of the material hoist system configured to raise a load to an elevated surface; wherein each of the drive and the carriage are configured to be separately coupled to the track and then to each other to slideably lock in a locked position of each of the drive and the carriage with respect to the track.

Abstract: A post frame for guardrail post assembly includes a substantially vertical first mounting post arranged proximate a first lateral side of the post frame; a substantially vertical second mounting post arranged proximate a second lateral side of the post frame, opposite the first lateral side; an attachment housing coupled to and extending between the first mounting post and the second mounting post, the attachment housing configured to engage a guardrail attachment assembly; and a first wheel configured to permit the post frame to be rolled across a support surface.

Abstract: A drive for a material hoist system can include a housing configured to be slidably coupled to a track of the system; a motor positioned inside the housing; a gearbox positioned inside the housing and coupled to the motor; and a spool positioned inside the housing between the motor and the gearbox, the spool configured to: selectably wind and unwind a flexible connecting element coupled to the track; and drive movement of the drive along a longitudinal direction of the track.

Abstract: A guardrail post assembly includes a post frame defining a first lateral side and a second lateral side opposite the first lateral side; a first guardrail strap mounted proximate to the first lateral side; a second guardrail strap mounted proximate to the second lateral side, the first guardrail strap and the second guardrail strap mounted at equal heights on the guardrail post assembly; and a guardrail attachment assembly mounted to the post frame, the guardrail attachment assembly comprising a strap mounting portion and locking portion, the first guardrail strap mounted on the strap mounting portion.

Abstract: A guardrail post assembly includes a post frame defining a first lateral side and a second lateral side opposite the first lateral side; a first guardrail strap mounted proximate to the first lateral side; a second guardrail strap mounted proximate to the second lateral side, the first guardrail strap and the second guardrail strap mounted at equal heights on the guardrail post assembly; and a guardrail attachment assembly mounted to the post frame, the guardrail attachment assembly comprising a strap mounting portion and locking portion, the first guardrail strap mounted on the strap mounting portion.

Abstract: A method of using a material hoist system can include extending an overall length of a track assembly by slidably moving a second track member of the track assembly with respect to a first track member of the track assembly; and slidably moving a carriage of the system with respect to the track assembly.

Abstract: A drive for a material hoist system can include a housing configured to be slidably coupled to a track of the system; a motor positioned inside the housing; a gearbox positioned inside the housing and coupled to the motor; and a spool positioned inside the housing between the motor and the gearbox, the spool configured to: selectably wind and unwind a flexible connecting element coupled to the track; and drive movement of the drive along a longitudinal direction of the track.

Abstract: A hatch actuating device can include a housing; a sliding portion received within the housing; a gear assembly at least partially received within the housing and movably coupled to the sliding portion; and a flexible drive element coupled to the gear assembly; wherein the gear assembly is configured to open a hatch lid of a hatch through rotation of a portion of the gear assembly by pulling of the drive element.