摘要:
A ladder (1) comprising two vertical uprights (2) and a plurality of horizontal steps (3) supported by the uprights (2). Each upright (2) is a vertical section bar which branches off from at least one end of the two side walls (P2) and is parallel to the outer wall (P1). Each step (3) is a C-shaped section bar and has a horizontal upper wall (P5) and two vertical side walls (P6) which branch off from opposite ends of the upper wall (P5). The outer wall (P1) of each upright (2) is provided with a plurality of outer through-holes (4) which enable the insertion of the steps (3) therein. The inner wall (P3) of each upright (2) is provided with a plurality of inner through-holes (5) which enable the insertion of the steps (3) therein. The side walls (P6) of each step (3) are provided with slits (6) which enable the interlocking of the steps (3) with the inner walls of the uprights (2).
摘要:
A method of designing (300) an optimised component (100) for a load-bearing application comprises the steps of: analysing (302) a solid component (200) having an external shape to determine a stress distribution in the solid component (200) in response to an applied load; and defining (304), based upon the determined stress distribution in the solid component (200), a structure for an optimised component (100) comprising an outer skin layer (108) and an internal filament structure (110). The outer skin layer (108) forms an external shape substantially identical to the external shape of the solid component (200) and the internal filament structure (110) is enclosed by the outer skin layer (108), such that the optimised component (100) is configured to bear the applied load.
摘要:
A horizontal extendable ladder is revealed. The horizontally extendable ladder includes at least three rails and a plurality of rungs disposed between the two adjacent rails. The three rails are set vertically while the rungs are equally spaced and arranged horizontally between the two adjacent rails from top to bottom to form at least two ladder frames. Each of two ends of the rung is arranged with a first pivot shaft that is pivotally connected to the rail. Thereby the rungs can be rotated synchronously between the two adjacent rails for horizontal retraction or extension of the ladder. The ladder is used more efficiently.
摘要:
A device for stabilising a ladder against a surface, the ladder having a pair of stiles and a plurality of rungs connected therebetween, the device comprising : an engagement mechanism for releasably engaging two adjacent rungs, the engagement mechanism including two opposed receiving portions for at least partially receiving a rung, at least one of the receiving portions being selectively movable relative to the other thereby allowing the engagement mechanism to urge against the adjacent rungs; and at least one arm pivotably connected to the engagement mechanism to allow pivoting thereof to a fixed angle relative to the engagement mechanism, the at least one arm having an abutting portion for abutting under the surface, thereby allowing the ladder to be wedged between the surface and ground level to stabilise the ladder.
摘要:
Embodiments include a telescoping ladder with a plurality of retaining mechanism. The telescoping ladder has a plurality of columns in a nested telescopic arrangement. The retaining mechanism positioned on an outer surface of a column prevents extending columns other than an immediately inner column from their nested arrangement until the immediately inner column is fully extended from its nested arrangement with an outer column.
摘要:
A telescopically extendable and collapsible ladder assembly having at least three ladder sections with two tubular stile members arranged parallel to each other and interconnected at one end by a ladder rung to form a U-shaped ladder section. The ladder assembly comprises latch mechanisms being associated with actuators for locking the telescopically inserted stile members relative to one another when the ladder sections are extended. Each ladder section includes a connector at each end of a rung, the connector having first and second collar segments with spaced apart opposed ends. A fastener bridges the opposed ends of the collar segments for securely coupling the collar segments around the stile member. The first collar segment extends over an angle of between 120 and 150 degrees with respect to the longitudinal axis of the rung, whereas the second collar segment extends over a complementary angle.
摘要:
La présente invention concerne une échelle (10) télescopique comprenant une extrémité proximale (12) adaptée à être fixée sur un support, l'échelle (10) comprenant entre l'extrémité proximale (12) et une extrémité distale (16) une pluralité de tronçons (18) déplaçables les uns par rapport aux autres pour déployer l'échelle (10), le tronçon (18 1 ) disposé au niveau de l'extrémité proximale (12) de l'échelle (10) étant réalisé dans un matériau ayant une densité supérieure à la densité du matériau dans lequel est réalisé au moins un autre tronçon (18) de l'échelle (10).