A shelf and ladder combination includes two support rod units, partition plates connected between the support rod units, a cross bar, two main connecting brackets connecting the cross bar to the support rod units, and a ladder unit. The ladder unit includes two ladder legs, at least one fixing unit, and a plurality of rungs connected between the ladder legs. Each ladder leg has a first end portion adjacent to the crossbar, and a second end portion opposite to the first end portion. The at least one fixing unit is sleeved on the crossbar, is slidable along the crossbar, and is connected to the first end portion of one of the ladder legs.

A slidable ladder device is configured to be sleeved on and slidable along a crossbar, and includes two support rods and a plurality of steps connected between the support rods. At least one fixing unit is connected to an end portion of one of the support rods, and includes a base member having a main portion, a connecting portion and an extension portion cooperatively defining an insertion space for insertion of the crossbar therethrough. A switchable member is pivotally connected to the connecting portion, and is rotatable relative to the connecting portion between closed and open positions, in which the switchable member closes and opens an opening of the insertion space, respectively.

A slidable ladder device is configured to be sleeved on and slidable along a crossbar, and includes two support rods and a plurality of steps connected between the support rods. At least one fixing unit is connected to an end portion of one of the support rods, and includes a base member having a main portion, a connecting portion and an extension portion cooperatively defining an insertion space for insertion of the crossbar therethrough. A switchable member is pivotally connected to the connecting portion, and is rotatable relative to the connecting portion between closed and open positions, in which the switchable member closes and opens an opening of the insertion space, respectively.

A ladder supporting device for supporting a ladder in upright orientation at an upright surface comprises a channel extending longitudinally from a first end to a second end arranged horizontally spaced across the upright surface with a backside facing the upright surface, a holding device located outside the channel distal to the upright surface, and at least one wheel rotatably supported on an axle connected to the holding device and passing into the channel which receives the at least one wheel such that the holding device is positionable longitudinally of the channel by rolling movement of the at least one wheel along the channel.

A ladder supporting device for supporting a ladder in upright orientation at an upright surface comprises a channel extending longitudinally from a first end to a second end arranged horizontally spaced across the upright surface with a backside facing the upright surface, a holding device located outside the channel distal to the upright surface, and at least one wheel rotatably supported on an axle connected to the holding device and passing into the channel which receives the at least one wheel such that the holding device is positionable longitudinally of the channel by rolling movement of the at least one wheel along the channel.

A mechanism that allows a ladder to be moved to either a use position or a retracted position. The ladder can be moved from the retracted position to the use position with a minimal effort, and the ladder moves by itself from the use position to the retracted position. A pit ladder apparatus for an elevator according to the present invention includes a position change means to be provided in a fixing metal frame fixed to the hoistway and allowing a ladder to be moved to either the use position when the ladder is used or the retracted position for retracting the ladder when it is not used so as not to interfere with operation of the elevator.

The invention relates to a ladder system for trench shoring, comprising a lower ladder (14) which extends from the bottom of a trench over a lower subportion (T1) of the height of the trench, and an upper ladder (16) which extends over an upper subportion (T2) of the height of the trench up to a trench edge, wherein the upper ladder (16) is a suspension ladder for suspending onto a shoring panel (12). A ladder system according to the invention is intended to increase the safety of the workers particularly for deep trenches. In a ladder system according to the invention, a platform (22) is arranged at the lower end of the upper ladder (16) is, and that the lower ladder (14) is a stepladder or leaning ladder which stands on the bottom of the trench.

A method and apparatus are provided for delivering items to a plurality of storage locations is provided. The system includes a plurality of storage locations. The storage locations may be positioned to provide an aisle and a delivery mechanism may be operable within the aisle to deliver items to the storage locations. A service platform may be provided. The service platform may be displaceable within the aisle to provide an elevated platform for an operator to provide service to the delivery mechanism or the storage locations.

A shelf and ladder combination includes two support rod units, partition plates connected between the support rod units, a cross bar, two main connecting brackets connecting the cross bar to the support rod units, and a ladder unit. The ladder unit includes two ladder legs, at least one fixing unit, and a plurality of rungs connected between the ladder legs. Each ladder leg has a first end portion adjacent to the crossbar, and a second end portion opposite to the first end portion. The at least one fixing unit is sleeved on the crossbar, is slidable along the crossbar, and is connected to the first end portion of one of the ladder legs.

A shelf and ladder combination includes two support rod units, partition plates connected between the support rod units, a cross bar, two main connecting brackets connecting the cross bar to the support rod units, and a ladder unit. The ladder unit includes two ladder legs, at least one fixing unit, and a plurality of rungs connected between the ladder legs. Each ladder leg has a first end portion adjacent to the crossbar, and a second end portion opposite to the first end portion. The at least one fixing unit is sleeved on the crossbar, is slidable along the crossbar, and is connected to the first end portion of one of the ladder legs.