Abstract: An extension ladder including a base section having two side rails with rungs spanning horizontally between them. The extension ladder including an intermediate fly section having two side rails with rungs spanning horizontally between them. The intermediate fly section slidably attached to the base section. The extension ladder including a top fly section having two side rails with rungs spanning horizontally between them, the top fly section sliding attached to the intermediate fly section with the intermediate fly section disposed between the base and the top fly section. The extension ladder including a handle having a first strap portion attached to the base section having a first buckle portion, and a second strap portion attached to the top fly section having a second buckle portion that engages with the first buckle portion when the base section, intermediate fly section and top fly section are in a folded state. A method of moving an extension ladder.

Abstract: A motorized wheel system with wireless remote for portable support structure such as ladders and scaffolds to enable a user to relocate the ladder without dismounting by attaching wheels to the portable structure's legs wherein the wheels are remotely controllable. The motorized wheel system with a remote control mechanism comprises a remote motorized wheel device associated with each leg, each having a power supply for driving a motor and a receiver that is in radio communication with a transmitter on a remote control mechanism used to remotely engage the power supply and steer the wheels.

Abstract: An extension ladder assembly having an anti-slipping mechanism is provided. The extension ladder includes a master ladder, a slave ladder, a pulley, a locking mechanism, the antislipping mechanism and adjustable ladder feet. The master ladder and the slave ladder are each composed of two posts and several rungs. The master ladder and the slave ladder are each composed of two posts and several rungs. The master ladder is slightly wider than the slave ladder. The anti-slipping mechanism prevents the slave ladder from being tripped and slid down, thereby safeguarding the safety of a user of the ladder. The pulley and the locking mechanism make the extension ladder suitable for various height requirements on work sites. The adjustable ladder feet make the extension ladder stand firm and secure by fine and minor adjustment of angles to accommodate different surface or ground conditions the ladder is placed upon.

Abstract: An extension ladder consisting of a lower ladder section and an upper ladder section secured to one another so that the upper ladder section can be extended relative to the lower ladder section using a ladder extension rope. Each ladder section has the same width and each has a pair of spaced stiles with rungs. A clutch member extends between the ladder sections and is movable between a locked position, for mounting the upper ladder section at a desired extension relative to the lower ladder section, and a released position. A clutch locking mechanism biases the clutch member into the locked position. The stiles of each ladder section has formations for securing the sections relative to one another, and enable the upper section to be extended and retracted in relation to the lower ladder section.

Abstract: The safety of a user of an extension ladder may be increased by a method of testing whether a fly section has been properly extended and locked into position, which method also impedes inadvertent descent of the fly section. The method of increasing safety of using an extension ladder involves the use of a locking device, comprising an insertion pin designed to be inserted into an insertion hole extending from side to side of a rail on one section of the ladder. The insertion pin is attached to the side of a corresponding rail on the other section of the ladder. The attachment of the insertion pin and the location of the insertion hole are designed so that the insertion pin may be inserted into the insertion hole only when the fly section is properly positioned with respect to the base section, to ensure that rung locks are engaged to hold the fly section in place.

Abstract: This invention relates to a ladder device, particularly to one that is collapsible. More particularly, provided is a ladder that can be opened or closed from the ground or some elevated point. Additionally, there is provided a feature so that the ladder can be completely closed. The ladder comprises a remote-control system that permits all of the above-identified attributes to be accomplished.

Abstract: An elevator, especially an oblique elevator, has a plurality of telescopic sections, along which a load container is movable. The telescoping of the sections takes place in such a manner that all the telescopic sections move simultaneously in relation to one another, or in such a manner that, as a given telescopic section extends, it takes with it all those arranged after it, as a "pack". For the purpose of locking in any desired position of extension a locking/unlocking device is provided between each pair of adjacent telescopic sections. This locking is effected by the actuation of a draw cable attached to the lowermost telescopic section, the draw cable acting upon an actuating cable which effects the locking or unlocking. The actuating cable runs in tackle block manner around two cable guides, and is shortened or lengthened by the variation of spacing of two cable guides.