Class / Patent application number | Description | Number of patent applications / Date published |
052187000 | Helical type | 6 |
20080236066 | Segmented spiral staircase and kit for its construction - A segmented spiral staircase and kit for its construction has a plurality of laterally extending step segments. Each step segment has a step surface with an inboard, donut-shaped end section and lower downwardly extending support members. Each step segment also has an upstanding baluster rail member connected by screws to the outboard end of the step surface. The step segments are each rotatably mounted, at their respective inboard end sections, in offset fashion through a vertically standing support post. The baluster rail members of the step segments are configured to be aligned adjacent to each other and are connected one to the other by screws. Spacer sleeves separate each of the step segments, whose lower support members are positioned against the vertical surfaces of the sleeves. Alternate stacking of the sleeves and step segments and connection of the baluster rail members produces a sturdy staircase structure which also includes an upper landing member. The relatively lightweight nature of the components of the kit make assembly easy and, by simply removing the screw connections between baluster rail members, a step segment or entire section of the staircase made up of several step segments can be rotated around the vertical support post to alter the configuration of the staircase. | 10-02-2008 |
20100107523 | BENT POLE COMPOSITE STAIRS - A staircase including a bent pole stringer with first and second straight stair sections separated by a spiral stair section. There is preferably a first bend defined on the stringer between the first straight stair section and the spiral stair section, and a second bend defined on the stringer between the spiral stair section and the second straight stair section. There are also a plurality of first straight stair treads cantilevered from the first straight stair section of the stringer, a plurality of spiral stair treads cantilevered from the spiral stair section of the stringer, and a plurality of second straight stair treads cantilevered from the second straight stair section of the stringer. | 05-06-2010 |
20110192099 | MODULAR SPIRAL STAIRCASE ASSEMBLY - A modular spiral staircase assembly that involves a handrail formed of one or more sections and a series of slide members each configured to form a link between both a baluster and the handrail of the staircase. The use of such slide members enables initial ease with respect to positioning of the balusters along the extent of the handrail and subsequent secure locking of such balusters in position with respect to the handrail for alignment purposes with corresponding treads of the staircase. Additionally, using such slide members along the extent of the handrail provides the installer ready-made tools for progressively shaping the extent of the handrail so as to align it with the curvature of the staircase. | 08-11-2011 |
20110258946 | SPIRAL STAIRCASE - A spiral staircase comprises a central supporting element and a plurality of steps which are connected to the supporting element at a first end, there being two types of steps positioned in an alternating fashion, of which a first type of step is substantially āLā-shaped and a second type of step is substantially arrow-shaped. | 10-27-2011 |
20120304560 | KIT FOR PRODUCING A STAIR CASE - A kit for assembling to produce a staircase, the kit comprising: a pair of star supports ( | 12-06-2012 |
20150101273 | Spiral box stair - A modular, prefabricated stair tower comprising a plurality of stairs, landings, handrails and hangers pre-assembled into a module configured such that it might be shipped and installed into a wind power tower tube section, with installation preferably occurring prior to shipment to the wind farm jobsite so that, when the tube section is erected vertically, authorized personnel gain immediate, efficient and economical access for ascending and descending large land based and offshore wind power turbine towers. | 04-16-2015 |