A hand-powered photovoltaic module hoist having a sled that slides along a ladder, and a pulley assembly mounted at the top of the ladder with a first cord to lift the sled and a second safety release cord to permit the sled to descend down the ladder. The sled is not attached to the ladder and the pulley assembly is a removable frame that is hung onto rungs of the ladder such that the hoist can quickly be installed on a standard ladder.

The present invention overcomes the disadvantages of the prior art by providing a pneumatic lift apparatus for a ladder. The apparatus is attachable to a conventional extendable ladder. The apparatus attaches to the lower end of the ladder and includes attachments for attaching the side rails of the ladder. A plate is attached in weight bearing relation between opposing pneumatic pistons which serve to lift the plate relative to the rails.

The present invention overcomes the disadvantages of the prior art by providing a pneumatic lift apparatus for a ladder. The apparatus is attachable to a conventional extendable ladder. The apparatus attaches to the lower end of the ladder and includes attachments for attaching the side rails of the ladder. A plate is attached in weight bearing relation between opposing pneumatic pistons which serve to lift the plate relative to the rails.

Systems and methods for providing access for workers to cell towers are disclosed. The system is useful on stealth cellular towers that do not have external ladders or climbing pegs for aesthetic reasons. The system may include a channel (e.g., a track) that may be permanently mounted to the cell tower and extends from a bottom of the cell tower to a top of the cell tower as well as a track-line (e.g., a chain, a belt, etc.) located within the channel such that the track-line acts as a loop running from the bottom of the cell tower to the top of the cell tower, and vice versa. A modular ladder with climbing pegs may be attached to the track-line and inserted into the channel such that the modular ladder may be pulled up the channel to the top of the cell tower by the track-line and then secured.

Systems and methods for providing access for workers to cell towers are disclosed. The system is useful on stealth cellular towers that do not have external ladders or climbing pegs for aesthetic reasons. The system may include a channel (e.g., a track) that may be permanently mounted to the cell tower and extends from a bottom of the cell tower to a top of the cell tower as well as a track-line (e.g., a chain, a belt, etc.) located within the channel such that the track-line acts as a loop running from the bottom of the cell tower to the top of the cell tower, and vice versa. A modular ladder with climbing pegs may be attached to the track-line and inserted into the channel such that the modular ladder may be pulled up the channel to the top of the cell tower by the track-line and then secured.

The present disclosure provides a ladder which selectively allows or prevents user access to the ladder steps, such that the ladder can only be climbed when such access is allowed. For example, the ladder may only selectively allow ingress into a bathing enclosure, e.g. when operated by an adult, but may allow egress from the bathing enclosure by any user. The ladder includes an elevator that is movable between a safety configuration, in which ingress is prevented or inhibited but egress is permitted, and a ladder configuration, in which both ingress and egress are permitted.

The present disclosure provides a ladder which selectively allows or prevents user access to the ladder steps, such that the ladder can only be climbed when such access is allowed. For example, the ladder may only selectively allow ingress into a bathing enclosure, e.g. when operated by an adult, but may allow egress from the bathing enclosure by any user. The ladder includes an elevator that is movable between a safety configuration, in which ingress is prevented or inhibited but egress is permitted, and a ladder configuration, in which both ingress and egress are permitted.

A lifting device is disclosed for elevating an object between a first elevation and a second elevation. The lifting device comprises a base frame, a load bearing frame coupled to the base frame, an elevation reducing frame coupled to the load bearing frame and an extension frame coupled to the elevation reducing frame. A mounting bracket is coupled to the base frame. The mounting bracket engages a rung of a ladder. A load winch is coupled to the load bearing frame and lifts the object and transferring the weight of the object to the ladder. The base frame, the load bearing frame and the elevation reducing frame define an object chamber for receiving the object in the object chamber and increasing the elevation of the object relative to the extension frame.

A lifting device is disclosed for elevating an object between a first elevation and a second elevation. The lifting device comprises a base frame, a load bearing frame coupled to the base frame, an elevation reducing frame coupled to the load bearing frame and an extension frame coupled to the elevation reducing frame. A mounting bracket is coupled to the base frame. The mounting bracket engages a rung of a ladder. A load winch is coupled to the load bearing frame and lifts the object and transferring the weight of the object to the ladder. The base frame, the load bearing frame and the elevation reducing frame define an object chamber for receiving the object in the object chamber and increasing the elevation of the object relative to the extension frame.

The present invention provides a hoisting device for working in heights, specifically including a vehicle body, a lower bracket installed at a bottom of a safety ladder, a host driver fixed on the lower bracket and providing lifting power, an upper bracket installed at a top of the safety ladder, a traction rope connecting the upper bracket, the vehicle body and the host driver, and a sliding rail installed on the safety ladder, and further including a fall arrester installed on the sliding rail, a guiding device assembly installed on a back portion of the vehicle body, a stall protection device installed on the vehicle body and matched with the sliding rail, a collapsible pedal installed on a lower portion of the vehicle body and configured to carry people and goods, an operation handle fixed to an upper portion of the vehicle body and a position-limiting bracket installed on an upper portion of the safety ladder. The host driver drives, trough the traction rope, the vehicle body to ascend or descend along the sliding rail, thus enabling the vehicle body to ascend or descend so as to convey people and goods. The hoisting device is simple and convenient to operate, occupies a small floor space and can be installed without changing a structure of an original safety ladder.