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| Number | Title | Issue Date |
| 7866443 | Adjustable stair stringer and railing An adjustable stair stringer and railing construction assembly is disclosed. The assembly is adapted to use a pair of parallel stringer arms for each side of the stair, a riser/tread support bracket for each stair and alignment and spacing elements for spacing the s... | 01/11/2011 |
| 7264082 | Convertible ladder A ladder having a first ladder section, a second ladder section, an adjustable hinge mechanism, an engagement indicator and a static hinge mechanism. The adjustable hinge mechanism is mounted with respect to the first ladder and the second ladder so that the adjusta... | 09/04/2007 |
| 7232010 | Modular hunting ladder A hunting ladder for attachment to a tree or pole includes a plurality of ladder sections that can be assembled together to form a rigid structure, including side rails and rungs extending between the side rails. In an exemplary embodiment, the side rails comprise e... | 06/19/2007 |
| 7134252 | Retrofit hurricane and earthquake protection Retrofit connectors that secure together the outside sheathing and underlying structural members of wood-frame or masonry houses, preventing damage when subjected to lateral stresses from a hurricane, or transverse loads from an earthquake. The connectors have speci... | 11/14/2006 |
| 7086499 | Light weight ladder systems and methods A method for manufacturing a rail for a ladder. The method may include pultruding in a longitudinal direction, a rail having a selected cross-sectional shape. The rail may then be cut to a predetermined length at a distal end. A force may be applied, in a lateral di... | 08/08/2006 |
| 7048094 | Extending ladder and associated manufacturing methods Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending betwe... | 05/23/2006 |
| 6868944 | Adjustable stair stringer and railing An adjustable stair stringer and railing construction assembly is disclosed. The assembly is adapted to use a pair of parallel stringer arms for each side of the stair, a riser/tred support bracket for each stair and alignment and spacing elements for spacing the su... | 03/22/2005 |
| 6817447 | Stair or ladder steps of the plate-shaped step type A stair step of the plate-shaped step type comprises plate members bent downwards from the stepping surface at all four rims. The plate members are welded together at the corners where they abut one another. The plate members at the front and rear rims are rolled ov... | 11/16/2004 |
| 6591942 | Process for manufacturing a composite material ladder and ladder obtained with said process A process for manufacturing ladders comprises the following steps: arranging a plurality of rungs (2) of a material comprising a plurality of reinforcing fibers (2a) associated with a binding resin (2b) and each having at least one coupling portion (2c); ... | 07/15/2003 |
| 6354403 | Adjustable stair stringer and railing An adjustable stair stringer and railing construction assembly is disclosed. The assembly is adapted to use a pair of parallel stringer arms for each side of the stair, a riser/tred support bracket for each stair, and alignment and spacing elements for sp... | 03/12/2002 |
| 6279681 | Collapsible ladder having highly nesting rungs with integral stand-off projections A collapsible ladder having rungs of a relatively strong and thin material with integral stand-off projections that allow the ladder to be safely descended and of a cross-section that allows the ladder rungs to nest to a high degree of compactness. The la... | 08/28/2001 |
| 6145621 | Boarding ladder for a boat bow A foldable ladder suitable for boarding a boat from the bow end thereof having laterally spaced side rails each with upper and lower portions. The upper and lower portion of one side rail are hinged together or pivoting in an outward direction and the upp... | 11/14/2000 |
| 6032759 | Ladder with anti-deformed side rails A ladder with anti-deformed side rails comprises two tubular side rails, a plurality of rungs, and two tubular inner bushings. Each of the bushings is tightly fitted with the inner surface of each side rail respectively and passed through by the respectiv... | 03/07/2000 |
| 6000496 | Flexible step assembly for vehicles A flexible step assembly for vehicles which includes a number of vertically disposed horizontal steel tread members attached at their ends to flexible side members. A spring loaded assembly is attached to the upper ends of each side member, the spring loa... | 12/14/1999 |
| 5636483 | Adjustable stairstep system and process of assembling and installing same A prefabricated stair system having individually pivotally mounted right angular brackets on opposed stringers, has a control bar which removably contacts the brackets to assume all brackets are arranged at the same angles with respect to the stringer so ... | 06/10/1997 |
| 5553421 | Structural building components Prefabricated, preferably pre-cast concrete, stringers and treads can be employed to provide either a staircase of any required inclination, a horizontal walkway or a ramp of a required inclination. In all these applications, the same standardized stringe... | 09/10/1996 |
| 5475954 | Modular support element adapted to form a support for a tread of a staircase A support for treads of a staircase is formed by a plurality of support elements each comprising an upper plate and a lower plate, the lower and upper plates of each element being adapted to rest on the upper and lower plates respectively of contiguous el... | 12/19/1995 |
| 5244058 | Portable fence-scaling step A portable step has a tread member to which is pivoted corresponding ends of a pair of support arms that terminate at their opposite ends in projections which extend from the arms at an acute angle thereto. The support arms are rockable to positions in wh... | 09/14/1993 |
| 5156234 | Ladder structure A single run or extension ladder particularly suitable for use where electrical safety is significant. Stiles 6 are each formed from a pair of elongate hollow members 5 fabricated from glass-fibre material. Rung supports 7 are formed from an aluminium ext... | 10/20/1992 |
| 5145031 | Electric ladder An adjustable ladder comprising, a pair of side supports, a device for retaining the supports in a spaced relationship, a rung, a device for slidably mounting the rungs in the supports, and a device for moving the rung along the supports for adjusting the... | 09/08/1992 |
| 5143174 | Dismountable ladder A dismountable ladder for use with transom, swim or dive platforms having a pair of similarly shaped vertical upper side members. The upper end of each upper side member is formed as a U-shaped hook for releasably receiving a portion of a transom, swim or... | 09/01/1992 |
| 5134820 | Adjustable built-up stair A built-up stair assembly of includes a plurality of stair units, of which the angular position of each unit stair can be flexibly adjusted horizontally as well as vertically. Each stair unit includes a T-shaped plate mounted with a tread board and having... | 08/04/1992 |
| 5131197 | Mounted stairway The first preferred embodiment of the subject invention is a mounted stairway built on a central single stringer which utilizes stairs horizontally adjustable with regard to inclination of the stringer. The stairs are fixed in the middle by means of splin... | 07/21/1992 |
| 5123210 | Flight of stairs The invention concerns a flight of stairs with a multiple of steps--where each step is firmly connected at least at one lateral end with the subsequent step by two vertical members, and where the bottom and top steps (22, 12) are resting on an intermediat... | 06/23/1992 |
| 5085020 | Portable, assemblable-disassemblable staircase A portable, assemblable-disassemblable staircase includes a plurality of stair units to be assembled and disassembled, each of the stair units including a horizontal base plate, an upward joint vertically installed at a rear end of the horizontal base pla... | 02/04/1992 |
| 5080193 | Improved hunter's ladder stand An improved hunter's ladder stand includes irregularly shaped legs and rungs which provide structure that blends into an outdoor environment comprising irregularly shaped trees, branches and shrubs. The irregular shape of the hunter's stand provides less ... | 01/14/1992 |
| 5058339 | Curved stairway and method A curved stairway is illustrated wherein the usual wooden components, including the stringers A, are provided with steel reinforcement, including metallic stringers B provided with cross bracing D and E in order to provide a composite structure affording ... | 10/22/1991 |
| 5050861 | Adjustable bench-step An adjustable bench-step for use in exercising, having an upper platform that is easily and securely insertable into a base, with the upper platform further being both adjustable vertically and approachable from any horizontal axis.... | 09/24/1991 |
| 5014818 | Children's vanity step-stool A step-stool for enabling a child to climb up to the top surface of a cabinet made of a top piece, a bottom piece and a middle step or platform piece adapted to slide out from between the top piece and the bottom piece to form a step. Two T-shaped spacers... | 05/14/1991 |
| 4917216 | Segmented ladder construction A construction unit for assembling into a ladder like assembly wherein the unit is provided with parallel and opposed side rails joined by at least one cross-member, the ends of the side rails being adapted for end to end telescopic joining into a multi-u... | 04/17/1990 |
| 4901818 | Fire fighting roof ladder accessory A firefighting roof ladder accessory that is designed to be supported between two roof ladders. The accessory comprises a beam, having two foot supprot surfaces that are perpendicular to each other, and end boxes each extending over a ladder rail and prov... | 02/20/1990 |
| 4871047 | Adjustable grab iron This invention relates to grab irons and more particularly to two-piece, adjustable grab irons. The grab iron consists of a handhold-shape containing a mounting flange portion and a rod member as well as a grabfoot-shape containing a mounting flange porti... | 10/03/1989 |
| 4842099 | Foldable ladder A foldable ladder has collapsible crosspieces having a 90-degree pivot in the middle, the crosspieces being mounted to opposite side rails likewise having 90-degree pivots. Push rails are provided to the right and left of the crosspiece inside each sidepi... | 06/27/1989 |
| 4842098 | Adjustable folding ladder The invention is an adjustable folding ladder that can be easily altered in its length and shape to adjust to the proper working height and angles for the user. With the fiber glass nylon hinges, the ladder is insulated to prevent the user from electrical... | 06/27/1989 |
| 4798264 | Kneeling aid A kneeling aid to facilitate kneeling has planar, rectangular, platform, the upper surface provided with recessed storage compartments bounded by upstanding ribs, and a pair of three-sided recesses bounded by upstanding ribs conforming to the size and sha... | 01/17/1989 |
| 4798030 | Modular support for staircase steps The modular support for staircase steps comprises a substantially vertical box-like body upwardly defining a horizontal base plane for a related step, a male cylindrical element and a complementarily shaped female cylindrical element extending vertically ... | 01/17/1989 |
| 4723631 | Foldable ladder A ladder made of a rectangular main frame, spaced parallel rods interconnecting the two long side legs of the ladder, and step panels each pivotally mounted at its front corners to one rod for pivotal action within the ladder frame. A rigid link pivotally... | 02/09/1988 |
| 4715474 | Scaffold system A portable scaffold having tubular structural elements has necked fittings extending into the ends of the tubular elements and attached thereto by adhesive which is introduced through an entry port preferably provided by a porting ring sleeved on the neck... | 12/29/1987 |
| 4696372 | Portable step and carrying device for stud walls A portable step-forming device releasably attachable to a vertical wooden stud comprises a U-shaped gripping member for closely receiving a stud member, a step member attached to one prong of the U-shaped member and further having an enlarged end for reta... | 09/29/1987 |
| 4683981 | Molded hard elastomer steps and replacement and spreader steps for rope ladders and fittings therefor, as well as molding method therefor A rope ladder of the type having two spaced-apart pairs of ropes, has a metal frame for each step and has tubular nylon members with cylindrical bores, extending vertically through sets of through openings in the metal frame for assuring accurate bolt ali... | 08/04/1987 |
