RU2675096C2 - Platform ladder with telescopic stand for technical maintenance of flying apparatus - Google Patents

Abstract

FIELD: ladders.SUBSTANCE: invention relates to devices for providing access to high-lying aircraft elements, and can also be used in shipbuilding and other technical fields. According to the invention, a stand with a telescopic ladder contains a spatial frame consisting of a longitudinal and transverse power kit. Set of swivel-retracting front wheels, fixed rear wheels, front swivel-retracting stops, rear screw stops are attached to the lower part of the frame. Stand contains a basket for transportation of equipment and tow bar. Upper frame consists of at least two connected vertically arranged triangles to which a telescopic ladder is attached. Platform is made with lowering-climbing handrails and front swivel-retractable handrails. There are two struts, that consist of at least two links hinged at both ends and pivotally connected to each other. Telescopic ladder consists of at least two connected staircases, one rigidly fixed on the frame, and the other is adjustable. There are also handrails and a tray for the tool on the ladders, the handrail is rigidly connected to the longitudinal pipe of the staircase, a pivoting retractable handrail is attached to the handrail.EFFECT: technical result of the claimed invention is the simplification of the design and enhancement of its functionality.1 cl, 17 dwg

Description

The field of technology.

The invention relates to devices for providing access to inaccessible and highly located elements of the aircraft and can be used in shipbuilding and other technical fields.

The emergence of this invention arose in connection with the need to create a mobile platform with a fixed height in the working position and the presence of a telescopic ladder of variable height to provide access to hard-to-reach high-lying components and elements of the aircraft during maintenance work. In particular, during maintenance of aircraft engines installed on aircraft due to design features, namely, the design of the opening of the hoods, the dimensions of the platforms do not allow the use of lifting platforms to provide access to highly located nodes.

An analogue is known from the prior art, a telescopic ladder including a support frame on wheels, a fixed and a retractable flight connected by a cable-block system, a latch and a drive in the form of a winch, while the device is equipped with a spring-loaded rod, a case with grooves, a button with a head, rollers with a spring-loaded tube, and the latch is mounted to rotate on a fixed March and pivotally connected to a spring-loaded rod connected by a cable to a handle mounted on a fixed march, while one of the grooves of the housing made oblique, and the other - the horizontal to the vertical portions, thus to coaxially mounted spring-loaded button head tube, and the retainer has pins cooperating with a sliding march (Inventor's Certificate USSR №949152, publication date: 8.7.1982 g).

Significant disadvantages of the analogue are the complexity and massiveness of the structure, due to the introduction of an additional redundancy system, the range of moving and rubbing parts has increased and, as a result, the complexity of servicing these areas has increased and the durability of the product has decreased. Also, the analogue does not have a working platform, which reduces its functionality.

A prototype of the claimed invention is a ladder for servicing aircraft, containing a horizontal platform and support parts rigidly connected to it, while the device is equipped with a set of platforms installed on it with rollers mounted on one end thereof, and rigid struts rigidly attached to the other end with wheels (USSR copyright certificate No. 866936, publication date: 03/15/1985).

The main disadvantage of the prototype is the large dimensions of the structure and the inability to separately use the stairs without using the platform, as in the device proposed for patenting.

Identified analogue and prototype provide a staircase with a working platform, and do not have a separate adjustable telescopic ladder to provide a climb to the required height. Due to the presence of an independent telescopic ladder mounted on a stepladder, access to the internal compartments of the aircraft through technological hatches is provided.

The technical result of the claimed invention is to simplify the design and operation, as well as increasing its functionality.

The technical result achieved is achieved by the implementation of a ladder with a telescopic ladder for aircraft maintenance, containing a spatial frame consisting of a longitudinal and transverse power set, to the lower part of which are attached a node of the swivel-retractable front wheels, fixed rear wheel, front rotary-retractable stops , rear screw stops, a basket for transporting equipment and a tow bar, while the upper part of the frame consists of at least two vertically triangles to which the telescopic ladder is attached, a platform with lowering and rising handrails, front rotary retractable handrails and at least two struts, which consist of at least two links articulated to each other and pivotally attached to the triangles and platform, the platform consists of a longitudinal and transverse power set containing welded or bonded pipes, with a grid in the form of a coating on top, the platform has a mechanism for fixing the handrails and For their hinges, rotary-retractable handrails consist of at least two halves, which are a closed loop construction, articulated with lowering-rising handrails using loops; on the right in the direction of movement of the rotary-retractable handrail, a cap stopper is installed with the telescopic ladder consists of at least two interconnected ladders, one of which is rigidly fixed on the frame, and the other is made removable with the possibility of movement of the plane parallel to the first and fixing by means of at least two hooks that engage with the step of the rigidly fixed ladder with the possibility of locking with a safety valve, while the stairs consist of a longitudinal and transverse power set, and the steps act as a transverse power set, on the climbing ladder there are also handrails and a tool tray, while one handrail is rigidly connected to the longitudinal pipe of the ladder, and the swivel-swivel is pivotally attached to this handrail a handrail, which is a closed loop structure, the swivel-retractable front wheels contain a mechanism including a parallelogram, a two-link drawbar, a pivot axis, at least two clamps for attaching to the spatial frame and fixing elements, while the parallelogram consists of a steering rails pivotally connected to the link of the drawbar and with steering levers.

The claimed invention is illustrated by drawings.

In FIG. 1 shows a general view from the perspective of a 3/4 platform ladder with a telescopic ladder.

In FIG. 2 shows a general view of a platform ladder with a telescopic ladder.

In FIG. 3 shows a view of a platform with a handrail and a mechanism for fixing it with the nodes of the visit.

In FIG. 4 shows a view of the unfolded position of the swing-out handrails.

In FIG. 5 shows a view of the swiveling front wheels.

In FIG. 6: a), b) shows projections with local sections of the nodes of the telescopic ladder.

In FIG. 7, 8 local incision on the fixing mechanism of the climbing ladder.

In FIG. 9 local incision of the locking mechanism of the rotary retractable handrail.

In FIG. 10 shows the process of folding the struts.

In FIG. 11, 12, 13, 14 show views of the operating positions of the device.

In FIG. 15, 16, 17 show the types of work using the device.

The platform ladder with a telescopic ladder for aircraft maintenance (Fig. 1, 2) is a structure consisting of a spatial frame (1), consisting of a longitudinal and transverse power set. A swivel assembly with wheels (15), rear wheels (14), front swing-out stops (19), rear screw stops (13), baskets for transporting equipment (16), and a towbar for clutching one or the other are attached to the bottom of the frame wheeled vehicles (18). The upper part of the frame consists of two vertically connected triangles (17) connected to which a telescopic ladder (6), a platform (3) with lowering and rising handrails (4), front rotary-retractable handrails (5) and at least two struts (2).

The struts (2) are a structure consisting of at least two links articulated at both ends and articulated to each other. In the unfolded position, the struts (2) serve to absorb the loads transmitted from the platform and hold it in a horizontal position, (Fig. 10) shows the process of folding the struts. While lowering the platform, the struts provide stability and structural rigidity.

The platform (3) is a structure consisting of a longitudinal and transverse power set, which is a welded or fastened pipe, a coating in the form of a lattice is laid on top (20). On the platform (Fig. 3) there is a mechanism for fixing (21) the handrails (4) and the nodes of their daughter-in-law (22). The locking mechanism of the handrails (21) is a spring-loaded finger that enters the calibrated hole on the handrail, thereby fixing it from moving. The hinge assemblies (22) of the handrails are a fitting with a fixing bracket to the platform on one side and a pipe on the other side. Bearings are located inside the pipe, along which the handrails (4) move. The platform serves to locate people on it during work, as well as to locate the necessary equipment on its surface.

Handrails (4), is a structure (Fig. 3) of a closed loop (23) with guide bearings (24). They serve to ensure safety when people are on top. To ensure operation on a telescopic ladder with a folded platform, the handrails are removed.

Rotary-retractable handrails (Fig. 4) consist of two halves, which are a closed loop structure pivotally connected using loops to the handrails (4). On the right (in the direction of movement) rotary retractable handrail there is a cap stop (25) with a latch (26). In the retracted position, they are fixed to the handrail (4), preventing their spontaneous movement relative to the axis of rotation.

The telescopic ladder (6) consists of two interconnected ladders, one (7) rigidly fixed on the frame (1) and the second interchangeable (8), the movement of which is plane parallel to the first. The design of the stairs consists of a longitudinal and transverse power set; in this case, the transverse power set acts as steps. Increasing the height of the stairs is carried out by moving one staircase relative to another. On the climbing ladder (8), there are also handrails (9), (10) and a tray (11) for the tool. The handrail (9) is rigidly connected to the longitudinal pipe of the ladder (8). A rotary retractable handrail (10) is attached to the handrail (9), which in turn is a closed loop structure pivotally connected using loops. In the unfolded and folded position, the rotary retractable handrail (10) is locked using the lock (12) (Fig. 9). Fixation of the climbing ladder (8) relative to the fixed ladder (7) is carried out by two hooks (33) that are installed on the climbing ladder (Fig. 7), they engage with the step (34) on the fixed ladder and are locked with a safety valve (35) . The safety valve has the same design and operation principle as the locking mechanism of the handrails (21). Moving up and down the climbing ladder is carried out by muscular strength, due to the low weight of the structure. The movement of the climbing ladder (Fig. 8) is ensured by rolling the bowstring along the roller (37) on one side and sliding along the antifriction plate fixed to the L-shaped profile (36) on the other hand. This design prevents overturning of the climbing ladder relative to the articulated engagement with hooks (33) in all directions.

Swivel-retractable front wheels (Fig. 5) consist of a parallelogram-shaped mechanism, a two-link drawbar (27), a pivot axis (28), two mounting clamps (29) that are fixed to the spatial frame, and fixing elements. A parallelogram consists of a steering rack (30) pivotally connected to a drawbar link (31) and with steering levers (32). The two-link drawbar (27) is designed to ensure the maneuverability of the platform ladder with the telescopic ladder during its transportation, as well as for manipulations with the swivel-retractable front wheels by moving the latch.

The swivel-front wheels perform two functions:

1. Management of a platform ladder with a telescopic ladder.

2. Installation of a platform stepladder with a telescopic ladder on the supports (19) and cleaning from the supports.

Supporting, rear wheels serve only to move the platform ladder with a telescopic ladder and support it to the surface.

Supports (19) and (13) are elements of supporting a platform step ladder with a telescopic ladder when working on it. The supports provide longitudinal and lateral stability with the front wheels retracted. Due to the absence of a rolling body in the contact spot between the support and the surface, those conditions are provided under which the coefficient of friction is sufficient for its stability.

This invention combines the functions of a height-adjustable ladder and a folding and folding work platform, which are mounted on a movable frame. The maximum height of the stairs in the raised state is 2280 mm, the height of the working platform when unfolded is 1600 mm with its overall dimensions of 1000 mm in width and 1500 mm in length. Thanks to the folding platform, the overall size of this product is reduced, which increases the possibility of using stairs. The main difference from existing analogues is that all the manipulations of this invention are carried out with the help of muscle strength, and does not require additional lifting devices, this is achieved through the use of aluminum alloys, as a result of reducing the weight of the structure of this invention.

The work of a universal platform ladder with a telescopic ladder is as follows.

In the parking position, the platform ladder with the telescopic ladder is in the folded position, mounted on the stops (Fig. 11). To bring it into the transport position, it is necessary to fix the drawbar with a finger and raise the wheels (Fig. 12), and then rearrange the finger in the eyelet to fix the wheels in a horizontal position. Transportation is carried out by any type of transport with a standard clutch element for the trailer, as well as muscle strength with the participation of one person.

Before working on the platform, it is lifted with the help of muscle strength, until the struts reach the stops, after which the position of the struts is fixed using metal fingers installed in the eyes. This operating position is shown (Fig. 13). Next, the handrails are lifted (Fig. 14) for safe operation on the platform.

Depending on the type of work, a suitable configuration of the stepladder is selected, as shown in (Fig. 15-17).

The operation of the prototype proved the influence of a combination of essential features on the achieved technical result of the claimed invention, which consists in simplifying the design and operation, as well as increasing its functionality.

The claimed invention is new, since the entire set of features is unknown from the prior art described in the corresponding section of the description.

The claimed technical solution has an inventive step, since it does not explicitly follow from the prior art for a specialist.

It is industrially applicable to selected areas of technology.

Claims (1)

A ladder with a telescopic ladder for maintenance of aircraft, containing a spatial frame consisting of a longitudinal and transverse power set, to the lower part of which are attached a rotary retractable front wheel assembly, fixed wheel back, front rotary retractable stops, rear screw stops, basket for transportation of equipment and a towbar, while the upper part of the frame consists of at least two vertically located triangles to which the telescopic ladder is attached egg, a platform with lowering-rising handrails, front rotary-retractable handrails and at least two struts, which consist of at least two links, pivotally connected to each other and pivotally attached to triangles and the platform, the platform consists of a longitudinal and a transverse power set containing welded or bonded pipes, with a grid in the form of a coating on top, the platform has a mechanism for fixing the handrails and their nodes, the rotary retractable handrails consist of at least at least two halves, which are a closed loop structure, pivotally connected to the lowering-rising handrails by means of loops, on the right in the direction of movement of the rotary-retractable handrail, a cap restraint with a clamp is installed, the telescopic ladder consists of at least two connected between each other stairs, one of which is rigidly fixed on the frame, and the other is made interchangeable with the possibility of movement plane parallel to the first and fixing by means of at least two ryukov, which engage with the step of a rigidly fixed ladder with the possibility of locking with a safety valve, while the stairs consist of a longitudinal and transverse power set, and steps serve as a transverse power set, while there are also handrails and a tool tray on the climbing ladder, however, one handrail is rigidly connected to the longitudinal pipe of the ladder, and a rotary retractable handrail, which is a closed structure, is pivotally attached to this handrail Of the contour, the swivel-retractable front wheels comprise a mechanism including a parallelogram, a two-link drawbar, a rotary support axis, at least two clamps for attaching to the spatial frame and fixation elements, while the parallelogram consists of a steering rack pivotally connected to the drawbar link and with steering levers.

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