A freestanding, adjustable, modular spiral staircase embodied in a unique method of spiral staircase design is provided. The steps of the spiral staircase are arrayed and supported in a circular pattern around a central column with the outside edges or leading or trailing corners of the steps are supported by three peripheral columns, while step posts interconnect adjacent steps. Many parts are interchangeable and the steps adjustable to allow for shortening or lengthening the staircase. The base of the staircase unit is heavy to provide maximum stability and to prevent tipping.

A freestanding, adjustable, modular spiral staircase embodied in a unique method of spiral staircase design is provided. The steps of the spiral staircase are arrayed and supported in a circular pattern around a central column with the outside edges or leading or trailing corners of the steps are supported by three peripheral columns, while step posts interconnect adjacent steps. Many parts are interchangeable and the steps adjustable to allow for shortening or lengthening the staircase. The base of the staircase unit is heavy to provide maximum stability and to prevent tipping.

A freestanding, adjustable, modular spiral staircase embodied in a unique method of spiral staircase design is provided. The steps of the spiral staircase are arrayed and supported in a circular pattern around a central column with the outside edges or leading or trailing corners of the steps are supported by three peripheral columns, while step posts interconnect adjacent steps. Many parts are interchangeable and the steps adjustable to allow for shortening or lengthening the staircase. The base of the staircase unit is heavy to provide maximum stability and to prevent tipping.

A stackable step component with adjustable tread incline includes a step frame having a top edge surface and a bottom edge surface. The top edge surface is substantially level when the bottom edge surface is in contact with an inclined ground surface. The stackable step component also comprises one or more ground penetrating features coupled to the step frame that secure the step frame to the ground surface and an adjustable tread coupled to the top edge surface. The adjustable tread allows adjustment of a tread incline angle. The step component is used to construct a stairway one step at a time without costly design intensive stringers. Each step component includes an adjustable tread so after installing, the tread incline of each step can be set to be level or at a desired angle. A quick and inexpensive outdoor stairway is constructed where each step supports at least three-hundred pounds.

A self-leveling staircase. The staircase has a first flight of self-leveling steps having a first end adjacent to the ground and a plurality of stair treads pivotally attached at a right edge to a first pair or stair rails and at a left edge to a second pair of stair rails. A self-leveling platform is pivotally attached on a second end of the first flight of self-leveling steps and to the first and second pair of stair rails. A second flight of self-leveling steps having a first end is pivotally attached to an opposite side of the self-leveling platform from the first flight of self-leveling steps. The second flight of self-leveling step has a plurality of stair treads pivotally attached at a right edge to a third pair of stair rails and pivotally attached at a left edge on front and back ends thereof to a second pair of stair rails.

The disclosure relates to a service pit having a head section and a foot section made from fiberglass, aluminum or other metal sheeting, molded plastic, or other suitable material. In one example embodiment, the service pit is equipped with a staircase pivotally mounted at one end of the service pit to accommodate a pivoting action of the staircase and permit access to the bottom of the pit for cleaning, maintenance or other operation.

The disclosure relates to a service pit having a head section and a foot section made from fiberglass, aluminum or other metal sheeting, molded plastic, or other suitable material. In one example embodiment, the service pit is equipped with a staircase pivotally mounted at one end of the service pit to accommodate a pivoting action of the staircase and permit access to the bottom of the pit for cleaning, maintenance or other operation.

A stair tower for a drilling rig is disclosed, the stair tower including a frame, one or more stair flights and platforms positioned within and mechanically coupled to the frame, and a cable tray pivotably coupled to the frame.

A stair tower for a drilling rig is disclosed, the stair tower including a frame, one or more stair flights and platforms positioned within and mechanically coupled to the frame, and a cable tray pivotably coupled to the frame.

A landscaping structure incorporates a plurality of metal spikes secured beneath a first plate. A second plate is removably secured to the top surface of the first plate. A cover is removably secured to the top surface of the second plate. The top cover comprises a plurality of materials and physical appearances capable of mimicking a paving stone or similar structure.