169 results about "Fixed ladder" patented technology

An elongated truss boom structure is adapted to be flattened and coiled to a stowed configuration. The truss boom includes longerons, battens, and diagonals. A fixed ladder shaped structure is formed by a plurality of fixedly coupled battens which interconnect two adjacent longerons. The truss boom is flattened for stowage by arranging all of the longerons coplanar to the plane of the fixed ladder shaped structure. The longerons preferably have a corrugated cross section. For stowage the longeron is heated and compressed into a ribbon shaped cross section, and upon deployment the longeron is heated to restore its corrugated cross section. A mechanical assembly machine includes a drum, a stowed flattened truss boom rolled into a coil around the drum, a device for unrolling the coil, an actuating and locking mechanism, and a control arm which connects the actuating and locking mechanism to the drum.

A portable vehicle ladder system employs a hinged ladder with a slideable extension having moveable rungs to adjustably vary the length of the ladder. The ladder's hinges allow it to be used as a straight ladder or in a plurality of configurations, including as a table support. The ladder is removeably secured to the vehicle by an upper ladder support bracket mounted on the vehicle on which the ladder is placed. Also mounted on the vehicle is a lower ladder connection system, in which handle controlled latches secure the lower end of the ladder and permit the ladder to be unlatched and removed from the vehicle when it is to be used independently of the vehicle. The system can also be installed onto vehicles with existing, permanently mounted ladders.

Latches are used to secure the legs of a stepladder during transport or while the ladder is leaned up against a wall or other surface. Embodiments for both extruded and solid-leg ladders are disclosed. A latch according to the invention includes a first latch portion mounted to one of the legs of the stepladder, and a second latch portion hingedly affixed to the first latch portion. In an unlatched state, the second portion is folded out of the way, enabling the stepladder to be used as a stepladder, and in a latched state, the second portion folded onto the other leg of the stepladder to hold the two legs together. A method according to the invention of latching the legs of a stepladder having a set of front legs with steps spanning right and left inside portions and a set of back legs also right and left inside portions, comprises the steps of: providing a latch with first and second hinged portions, fastening the first portion to the inside portion of one of the front legs between tow of the steps, and folding the second portion on onto one of the back legs so that the legs are latched together.

The invention discloses a ship passenger elevator vehicle. It contains the automobile chassis and the gangway ladder. It is characterized in that: there is hydraulic lifting shear shank on the automobile chassis. A lifting platform left by the shear shank is set on top of it. A rotating platform which can rotate around is set on the lifting platform by a rotating mechanism. The gangway ladder is located on the rotating platform and its front end has a mechanism hanging the shipboard. A fixed ladder is set on lateral of the shear shank to link the lifting platform and the automobile chassis. A chassis ladder connecting with the ground is set on the automobile chassis. The ship passenger elevator vehicles can be used for ro-ro ship and passenger ship to transport passengers up or down. It has mobility, flexibility and convenient operation.

The invention provides an adjustable ladder mounted system to facilitate the use of a lifting or support apparatus. This steel clamping system distributes the weight to four (4) different locations of a permanently mounted fixed ladder. The clamping system adjusts for all common ladder rail / leg sizes, and differences in spacing of the ladder rungs. This design allows for ease of set-up and use by a single worker, results in a solidly supported lifting structure / pole / shaft, economically produced, and can be easily moved from one location to another.

The rotary passenger ladder car for passenger ship has moving chassis, frame structure and auxiliary beam assembly on the chassis. The auxiliary beam assembly has four legs in the lower corners and hinged fixed ladder, and hydraulic fixed ladder support mechanism has the upper and the lower end hinged to the upper end of the fixed ladder and the auxiliary beam assembly separately. The platform installed in the upper part of the fixed ladder is provided with sliding platform capable of sliding back and forth and its guiding mechanism and rotary platform fixed via rotation shaft to the sliding platform and hinged to one end of the floating ladder. The rotary platform can drive the floating ladder to rotate around rotation shaft and on the sliding platform, and the hydraulic floating ladder supporting mechanism has two ends hinged to the middle part of the floating ladder and the rotating platform separately, and the floating ladder has roller mechanism in the upper end.

The application is directed to a ladder assist that may be secured to a ladder for preventing falls when persons are using a ladder. The ladder assist is operationally configured to prevent falls during access and egress of a fixed ladder of a structure, e.g., a fixed ladder of a transportation container or a building.

A circuit topology including stacked power amplifiers (e.g., class D PA cells) in a ladder arranged in a house-of-cards topology such that the number of stacked-domains follows a decaying triangular series N, N−1, N−2, . . . , N−i from a fixed ladder to an ith ladder to provide a 1:(i+1) voltage conversion ratio, each stacked domain outputs its power via a flying domain power amplifier cell, and each ladder balances stacked domains of a prior ladder and combines power from all prior ladders.

The ladder system is disposed between two spaced storage shelves of the types found in crowded warehouses. The ladder is mounted on overhead guide tracks and may be moved longitudinally along the shelves and laterally between the shelves. Locating means are provided for immobilizing the ladder against movement laterally and longitudinally. The locating means includes a pair of spring-loaded casters and rubber pads at the lower end of the ladder and a pair of braking mechanisms overlying and engageable with the guide tracks when subjected to the weight of the user to prevent movement of the ladder at the top thereof either intentionally or unintentionally. Finally, a lateral brake is carried by the ladder which prevents the roller carriage from moving laterally. The brake is applied when the ladder is in use.

A system for erecting a ladder stand for hunting has a pivoting base assembly connected to a bottom end of a ladder, and a pair of support legs pivotally attached to respective sides of an upper section of the ladder. The pivoting base assembly includes first and second foot pad members, anchoring stakes for anchoring the foot pad members to the ground, a base frame pivotally connected to the foot pad members, and first and second receiver tubes connected to the base frame for receiving the bottom end of the ladder. The pivoting base assembly receives and anchors the bottom end of the ladder and allows the ladder to be easily moved from a horizontal position to an upright position. The support legs have ground pegs at their lower ends for engaging the ground to support the ladder stand in an intermediate position as the ladder stand is being erected.

A ladder is equipped with a stabilizing device. The stabilizing device resists movements of the ladder's feet which would occur in response to movements of a ladder's user while on the ladder. The stabilizing device holds the ladder's feet and provides transverse and longitudinal structure to provide counter forces to the ladder's feet to hold the ladder's feet against movement. The stabilizing device may have rigid bars forming a box structure extending between the ladder's feet or may be formed as a solid panel. The stabilizing device may be retrofitted to existing ladders.

The invention provides a marine invisible ladder way, and belongs to the field of accommodation ladder of a ship. The marine invisible ladder way comprises a fixed ladder way and a movable ladder way, wherein, ladders of the movable ladder way and the fixed ladder way can be meshed with each other; the movable ladder way is connected with the fixed ladder way through a hinge mounted on the fixed ladder way; the movable ladder way and the fixed ladder way are folded or expanded through being connected with a hydraulic drive floating connecting rod mechanism, and the operation is convenient and fast and the running is steady; after being folded and restored to the original positions, the movable ladder way and the fixed ladder way are hidden below a deck and in a cabin body on the inner side of a ship board; the bottom surface and the back surface of the movable ladder way of the marine invisible ladder way, which respectively serve as a part of the deck of a ship body and a part of a side board surface of the ship body, coincide with the corresponding deck surface and the corresponding side board surface of the ship body to form a whole and become a part of the ship body, so that the area of the deck is not reduced, and the appearance of the ship cannot be influenced; when the marine invisible ladder way needs to be expanded during ship embarkation and disembarkation, the movable ladder way turns outwards at an angle of 180 degrees towards the side board of the ship relative to the fixed ladder way under the push of a hydraulic cylinder, thereby forming an integrated continuous ladder way extending downwards to the water surface, effectively reducing the height of a freeboard, and facilitating ship embarkation and disembarkation of people.

A system of increased safety when performing work using a ladder is described. The system includes a ladder bracket for temporarily attachment of a ladder to a structure to stabilize or secure the ladder. The bracket is easy to install and acts to limit or prevent slippage of the ladder laterally or away from the structure and generally promotes a greater margin of safety. In addition, the system includes a bracket for temporarily, yet securely, attaching a safety railing to a ladder.

The invention relates to a climbing ladder and a storage rack with same. The climbing ladder comprises a ladder assembly, a guide rail assembly and a guide rail fastener, wherein the guide rail assembly comprises a track; the guide rail fastener is matched with the track; the guide rail fastener can slide relative to the track; the ladder assembly comprises a guide rail section, a support section and at least one connection section; the connection section is rotationally connected with the guide rail section and the support section respectively; the guide rail fastener is connected with the guide rail section; a universal wheel is arranged on the support section. The climbing ladder provided by the invention can be folded into a plurality of sections to be collected, so that the occupied space is effectively reduced; the climbing ladder can slide on the storage rack; rapid storage of articles is facilitated; meanwhile, the trouble of carrying the ladder is avoided; the problem that a non-fixed ladder easily falls down to hurt people in movement and application can also be avoided.

The invention provides a unidirectional chain type extendable gangway ladder, which comprises an extendable gangway ladder main body, a gangway ladder extension mechanism, a gangway ladder pitching mechanism, an entire dragging machine frame device and a safety guardrail; the extendable gangway ladder main body comprises at least one section of extendable ladder and one section of fixed ladder; the gangway ladder extension mechanism comprises a rotating shaft, a chain wheel arranged on the rotating shaft, a unidirectional chain of which one end is fixed on the outmost section of extendable ladder and of which the other end is meshed with the chain wheel, and a driving mechanism which is connected with the rotating shaft through a clutch; and the gangway ladder pitching mechanism comprises a rope winding wheel which is connected with the driving mechanism through a clutch and a steel wire rope of which one end is wound on the rope winding wheel and of which the other end is connected with the front end of the fixed ladder. In the invention, the unidirectional chain type extendable gangway ladder is driven by a motor or manually, the extended length and angle of pitch of the gangway ladder can be regulated according to the position relationship between a ship body and a wharf, and the problem of safety channel between small and medium ships and warships and variable wharves and berths is solved.

A system of increased safety when performing work using a ladder is described. The system includes a ladder bracket for temporarily attachment of a ladder to a structure to stabilize or secure the ladder. The bracket is easy to install and acts to limit or prevent slippage of the ladder laterally or away from the structure and generally promotes a greater margin of safety. In addition, the system includes a bracket for temporarily, yet securely, attaching a safety railing to a ladder.

The invention discloses a liftable herringbone ladder, which comprises a fixed ladder, a transitional ladder and an elevator. A rotatable connection is formed between the upper end of the fixed ladder and the upper end of the transitional ladder, and a vertical sliding connection is formed between the elevator and the transitional ladder; Wherein, the fixed ladder and the transitional ladder can be opened and positioned to form a herringbone ladder or folded and positioned to form a straight ladder. The end protrudes from the bottom end of the transitional ladder. This technical solution has the following advantages: the elevator slides relative to the transitional ladder so that its top end protrudes from the transitional ladder top or / and its bottom end protrudes from the transitional ladder bottom, which can improve the entire herringbone ladder or one-character ladder. The height of the ladder can make the herringbone ladder suitable for various places even if the ground of the place is uneven or is a ladder, the ladder has a variety of adjustment functions for the elevator and the ladder height adjustment range is large.

The invention relates to a soft ladder connection piece used for aloft working of a power transmission line, in particular to an adjustable soft ladder for the power transmission line. The adjustable soft ladder is structurally characterized by comprising two adjustable ladder columns and pulley devices, each adjustable ladder column comprises a fixed ladder column body and a movable ladder column body, the upper side portion of each fixed ladder column is hollow, a plurality of transversely-penetrating through holes are distributed in the upper side portion of each fixed ladder column body in the axial direction, each movable ladder column body is located in a hollow inner cavity of the corresponding fixed ladder column body and can move up and down relative to the corresponding ladder column body so that the length of the end of the corresponding adjustable ladder column can be adjusted, and finally fixation is conducted through insertion pins. The adjustable soft ladder is characterized in that the height adjustment can be conducted at the upper ends of the ladder columns of the soft ladder heads. The ladder is hung on an overhead line of the power transmission line span of the large height difference, the parts, at the high positions, of the soft ladder columns can be descended, and two pulleys at the soft ladder can be hung into the overhead line and can not fall. The height of the soft ladder heads can be freely adjusted according to the height difference of the overhead line span, and therefore the adjustable soft ladder is convenient to operate and high in safety and reliability.

A clamping system for supporting an extension ladder on a gutter utilizes at least one and, more preferably, a pair of identical, clamp(s) to capture the ladder preventing movement laterally or horizontally away from the gutter. The clamp includes a clamp body with a latch pivotably mounted thereto which is spring biased to the gutter-clamping position. A lock screw may be utilized to prevent the latch from releasing the gutter preventing the ladder from moving. A pair of ears extends from each side of the clamp body and have slots which engage the channels on a forward face of the ladder leg.

A ladder mounting system includes a mounting bracket assembly having a top-bracket including a top-bracket-body, a first-section, and a second-section, at least one bottom-bracket, a bottom-bracket-body, and a substantially u-shaped clip. The mounting bracket assembly may be attached to a stationary-ladder on a recreational vehicle and support an additional item such as a ladder on the stationary-ladder. The device provides convenience and peace of mind to users by allowing them to quickly and easily secure a multitude of items to their stationary-ladder.

The invention relates to a moveable type hand-operated elevator. The moveable type hand-operated elevator consists of a fixed ladder frame and an elevator frame, wherein the fixed ladder frame consists of a fixed frame body, a transfer big wheel, a ratchet wheel, an operating crank, a moveable small wheel, a bearing foot, a sliding way, a hoisting pulley and a pedal cross rod; the elevator frame consists of a lifting frame body, a pedal cross rod, a standing pedal, a sliding rod, a supporting pulley, a safe protective chain and a safe protective guard; a lifting steel wire rope and a safe lock chain are arranged between the fixed ladder frame and the elevator frame. When the moveable type hand-operated elevator is used, the operating crank is operated by one hand, so that the lifting frame body is ascended or descended; during long-distance transfer, the elevator can be put down and the transfer big wheel is touched down; during short-distance motion, the moveable small wheel is moved for adjustment and a screw rod of the bearing foot is rotated to be touched down after in place. The elevator is convenient to transfer and simple to ascend and descend without power, safe and reliable, convenient to ascend and descend, simple to process and low in cost and saves time and labor.

A ladder dock system can include a ladder dock including a mounting panel and a connecting panel connected to the mounting panel, the ladder dock defining a ladder notch. The ladder dock system can further include a ladder configured to provide access to an elevated structure and sized to rest against the ladder dock, the ladder notch sized to receive and fix a position of the ladder relative to the ladder dock.

The invention discloses a wave self-adaptive ocean platform full-automatic gangway ladder device and an application method thereof.The wave self-adaptive ocean platform full-automatic gangway ladder device comprises a fixed ladder, an extension ladder, a driving system, a laser ranging system and a safety device, the extension ladder is arranged in the space between the fixed ladder and a ship board outer plate, the driving system is located on an ocean platform deck, and a noose wound on a winch is connected with the extension ladder; the laser ranging system is located at the bottom of the extension ladder, one end of the safety and protection device is connected with a deck of the ocean platform, the other end of the safety and protection device is connected with the extension ladder, and after a ship travels to one side of the ocean platform and is detected by the laser ranging system, the PLC control system controls the extension ladder to ascend and descend along with fluctuation of the ship according to the preset height. The height of the operator stepping on the folding pedal is always kept unchanged, and the operator is connected with the safety and protection device when climbing. The device has the advantages of being simple in structure, safe, reliable, low in cost and easy and convenient to operate, avoiding collision between the gangway ladder and a ship and collision between an operator and the ship, and avoiding falling of the operator in a quick state.

A system of increased safety when performing work using a ladder is described. The system includes a ladder bracket for temporarily attachment of a ladder to a structure to stabilize or secure the ladder. The bracket is easy to install and acts to limit or prevent slippage of the ladder laterally or away from the structure and generally promotes a greater margin of safety. In addition, the system includes a bracket for temporarily, yet securely, attaching a safety railing to a ladder. A guardrail carriage for securing a person to a rail via a tether is further provided.

A circuit topology including stacked power amplifiers (e.g., class D PA cells) in a ladder arranged in a house-of-cards topology such that the number of stacked-domains follows a decaying triangular series N, N−1, N−2, . . . , N−i from a fixed ladder to an ith ladder to provide a 1:(i+1) voltage conversion ratio, each stacked domain outputs its power via a flying domain power amplifier cell, and each ladder balances stacked domains of a prior ladder and combines power from all prior ladders.

The invention discloses a ship passenger elevator vehicle. It contains the automobile chassis and the gangway ladder. It is characterized in that: there is hydraulic lifting shear shank on the automobile chassis. A lifting platform left by the shear shank is set on top of it. A rotating platform which can rotate around is set on the lifting platform by a rotating mechanism. The gangway ladder is located on the rotating platform and its front end has a mechanism hanging the shipboard. A fixed ladder is set on lateral of the shear shank to link the lifting platform and the automobile chassis. A chassis ladder connecting with the ground is set on the automobile chassis. The ship passenger elevator vehicles can be used for ro-ro ship and passenger ship to transport passengers up or down. It has mobility, flexibility and convenient operation.