A ladder having a first box rail having a first side, and a second side extending perpendicularly from the first side. The first side having a first hole. The second side having a first hole in alignment with the first hole of the first side. The ladder comprises a first hollow tube disposed in the first box rail in alignment with the first hole of the first side and the first hole of the third side. The ladder comprises a bracket having a first bracket hole in alignment with the first hole of the first side. The ladder comprises a first fastener extending through the first hole of the third side, the first hollow tube, the first hole of the first side and the first hole of the bracket which attaches the bracket to the first box rail.

Embodiments include a telescoping ladder with a plurality of columns and rungs. The ladder can have a plurality of locking assemblies for locking adjacent columns to a rung thereby restricting relative sliding motion between adjacent columns. The locking assembly can have a locking button positionable against the rung front surface and rotatable with respect thereto between a locked position and an unlocked position. The locking assembly can have a locking pin positioned within the rung and slidable between an extended position and a retracted position along a locking pin axis generally perpendicular to the rotational axis. The locking assembly can have a connector pin extending in a direction parallel to the rotational axis, for connecting the locking button to the locking pin such that rotation of the locking button about the rotational axis slides the locking pin about the locking pin axis.

A ladder having a first rail and a second rail. The ladder having a standard rung having a width permanently attached to the first rail and the second rail. The ladder having a first wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The ladder having a second wide rung having a width greater than the width of the standard rung which is permanently attached to the first rail and the second rail. The first wide rung, and the second wide rung are disposed in a work zone of the ladder. The work zone of the ladder is where a user typically stands on the ladder while performing tasks. The standard rung is disposed outside the work zone. A wide rung. A method for using a ladder. A method for producing a ladder.

A telescoping ladder is provided, that includes a plurality of columns disposed in a nested arrangement for relative axial movement in a telescopic fashion between a fully-extended position and a collapsed position. The columns are connected to rungs by way of connector assemblies. Each connector assembly has a locking pin moveable between an extended position or a retracted position for extending into or retracting out of openings of adjacent columns to selectively lock or release the columns respectively. The telescoping ladder includes a plurality of actuators that permit collapsing the ladder in a sequential manner, the sequence involving collapsing the columns on a lower portion of the ladder prior to collapsing columns immediately thereabove.

An extendable/retractable ladder assembly includes a first stile and a second stile and a plurality of rungs extending therebetween. Each stile may comprise a plurality of columns disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly connects the rungs to respective columns in the first and second stiles. The ladder has improved manufacturability since connector assemblies may be assembled before connecting the rungs to respective columns. The standing surface of the rungs may be angled such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. A latch assembly may be used to selectively lock relative axial movement between adjacent columns. The latch assembly includes a locking pin assembly comprised of a central post and an outer metal sleeve. An air damper may also be used to control airflow through the columns.

A ladder having a first rail and a second rail. The ladder having a standard rung having a width permanently attached to the first rail and the second rail. The ladder having a first wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The ladder having a second wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The first wide rung and the second wide rung are disposed in a work zone of the ladder. The work zone of the ladder is where a user typically stands on the ladder while performing tasks. The standard rung is disposed outside the work zone. A wide rung. A method for using a ladder. A method for producing a ladder.

A ladder having a first rail and a second rail. The ladder having a standard rung having a width permanently attached to the first rail and the second rail. The ladder having a first wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The ladder having a second wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The first wide rung and the second wide rung are disposed in a work zone of the ladder. The work zone of the ladder is where a user typically stands on the ladder while performing tasks. The standard rung is disposed outside the work zone.

An extendable/retractable ladder assembly includes a first stile and a second stile and a plurality of rungs extending therebetween. Each stile may comprise a plurality of columns disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly connects the rungs to respective columns in the first and second stiles. The ladder has improved manufacturability since connector assemblies may be assembled before connecting the rungs to respective columns. The standing surface of the rungs may be angled such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. A latch assembly may be used to selectively lock relative axial movement between adjacent columns. The latch assembly includes a locking pin assembly comprised of a central post and an outer metal sleeve. An air damper may also be used to control airflow through the columns.

The present disclosure is directed to a ladder attachment system for securing a ladder within a tower of a wind turbine. The ladder has parallel legs and a plurality of rungs arranged perpendicularly between the parallel legs. The ladder attachment system includes at least one external stiffener configured at a top end of each of the parallel legs. Each of the external stiffeners includes a longitudinal body having an open cross-section configured to receive one of the parallel legs along a length thereof. Further, the ladder attachment system also includes a load-bearing bracket assembly configured with each of the external stiffeners. In addition, the ladder attachment system includes at least one support arm arranged in a horizontal plane and configured with each of the parallel legs, with the support arms being spaced apart from the load-bearing bracket assembly along a height of the ladder.

A ladder having a first rail and a second rail. The ladder having a standard rung having a width permanently attached to the first rail and the second rail. The ladder having a first wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The ladder having a second wide rung having a width greater than the width of the standard rung, which is permanently attached to tile first rail and the second rail. The first wide rung and the second wide rung are disposed in a work zone of the ladder. The work zone of the ladder is where a user typically stands on the ladder while performing tasks. The standard rung is disposed outside the work zone. A wide rung. A method for using a ladder. A method for producing a ladder.