RU227891U1 - AVIATION STEP LADDER - Google Patents

Abstract

The utility model is used in the aviation industry, in helicopter manufacturing, the aviation stepladder is supplied together with the helicopter for periodic or operational maintenance of aircraft. The aviation stepladder comprises a working platform (1) equipped with a fence, which is secured to a ladder (49) installed on the front arc (6), on one side, and to a support part (50) installed on the rear arc (7), on the other side. The ladder (49) comprises two links (2, 3) connected to each other, each of which is made in the form of crossbars (24), in which steps (13) are secured, while forks (12, 16) are secured to the ends of the crossbars (24). The support part (50) comprises two links (4, 5) connected to each other, which are made in the form of posts (15), which are connected using crossbars (17). Forks are fixed to various elements of the aviation stepladder, the holes of which are aligned coaxially during installation and fixed with studs (11). The lower half-clamp (39) and the upper half-clamp (40) are used in the fastening units. Simplicity of installation, dismantling, and the possibility of compact folding are achieved. 2 s.p. f-ly, 10 ill.

Description

The field of technology to which the utility model relates

The utility model is used in the aviation industry, in helicopter construction, the aviation stepladder is supplied together with the helicopter for periodic or operational maintenance of aircraft units and assemblies.

State of the art

The 95-9907-600 stepladder for wiping and covering an aircraft is known (see "Aircraft Tu-154. Design and Maintenance" / Voloshin F.A. et al. - M., "Mashinostroenie", 1975), which includes a rear wheel, base, front wheel, tow bar, base ladder, retractable ladder winch, bucket trolley winch, retractable ladder lock, cable attachment points, cable, retractable ladder, bucket trolley, work platform, railings, folding platform, folding struts.

An aviation stepladder is known (RU 150735 U1, E06C 1/04, published 20.02.2015), which includes a frame, an upper platform, a flight of stairs connected to them, and a chassis. The flight of stairs is made of three parts - lower, middle and upper. The flight of stairs is designed with the possibility of folding in such a way that adjacent steps of the corresponding parts of the flight of stairs overlap one another.

Also, the well-known design of an aviation stepladder is closest to the declared model (RU 150912 U1, E06C 1/397, published 10.03.2015), which includes a frame on which a flight of stairs is mounted, with an installed working platform, with handrails, a turning unit and a pair of wheels with a driver, a wheel stopper.

The disadvantages of such devices are the lack of the ability to quickly disassemble the stepladder for transportation in the cargo cabin of a helicopter during operational forms of aircraft servicing; due to the height limitation, it is impossible to perform aircraft servicing work in all parts of the fuselage; and the approach of the known stepladder to the nose or central parts of the fuselage is limited due to the placement of attachments outside the helicopter.

Disclosure of the essence of the utility model

The technical problem solved by the claimed utility model is the creation of an aviation stepladder with the ability to transform its configuration depending on the location of servicing the helicopter units and assemblies, ensuring the mobility of folding and unfolding, the ability to transport in a folded form by various types of transport, and compactness for transportation.

The technical result consists in ensuring ease of installation, dismantling, and compact folding of sections of the aviation stepladder.

In order to achieve the technical result, an aviation stepladder is proposed, comprising a working platform 1, equipped with a fence, which is fixed to a ladder 49 on one side and to a support part 50 on the other side, wherein,

ladder 49 is installed on the front arc 6, and support part 50 is installed on the rear arc 7,

ladder 49 contains two links 2, 3 connected to each other, each of which is made in the form of crossbars 24, in which steps 13 are fixed, while forks 12, 16 are fixed at the ends of the crossbars 24,

the supporting part 50 contains two links 4, 5 connected to each other, which are made in the form of posts 15, which are connected by means of crossbars 17, which are attached to the posts 15 by rivets 48 through knees 44, link 2 of the ladder 49 is connected to link 5 of the supporting part 50 by means of spacers 25 and diagonals 9, the front arch 6 is connected to the rear arch 7 by means of spacers 10, the working platform 1 is made in the form of a flooring 19, at the corners of which brackets 20 are fixed, in the holes of which handrails 21 are installed, which are connected to each other in pairs by means of three crossbars 36, on one side two handrails 21 are connected by means of a diagonal brace 37, while opposite on the other side on each handrail 21 of the fence in the upper part brackets 35 are fixed, in which on both sides a folding crossbar 22 is inserted, equipped at the ends with fork-shaped screws with holes, while the crossbar 22 is fixed on both sides using pins 23,

the connection of the lower front row of the aviation stepladder is implemented in such a way that on the front arc 6 in two places a lower half-clamp 26 and an upper half-clamp 40 are installed, connected to each other, enveloping the front arc 6, while the openings of the lugs of the upper half-clamp 40 are aligned with the openings of the lugs of the fork 12, which is fixed at the bottom on the crossbar 24, on the inside in the lug of the upper half-clamp 40 a fork bolt 47 is fixed, fixed on the spacer 10, the aligned openings are fixed with the help of a pin 11,

the connection of the lower rear row of the aviation stepladder is implemented in such a way that a link 5 is fixed on the rear arc 7, while on the rear arc 7 in two places a lower half-clamp 39 and an upper half-clamp 40 are installed connected to each other, enveloping the rear arc 7, while the openings of the lugs of the upper half-clamp 40 are aligned coaxially with the openings of the lugs of the forks 32, which are fixed at the bottom of the link 5 at the ends of the posts 15, on the inside in the eye of the upper half-clamp 40 a fork bolt 47 is fixed, fixed on the spacer 10, the aligned openings are fixed with pins 11, in the lower part of the link 5 an eye 43 is fixed, in the opening of which a fork bolt 47 is installed, fixed on the diagonal 9, the aligned openings are fixed with the help of pin 11, the connection of link 2 with link 3 of the ladder 49 is implemented in such a way that in the lower part of link 3, forks 12 are secured at the ends of crossbars 24, and in the upper part of link 2, forks 16 are secured at the ends of crossbars 24, while the holes of fork 12 are aligned coaxially with the holes of fork 16, the aligned holes are fixed with the help of pin 11,

the connection of link 4 with link 5 of support part 50 is implemented in such a way that in the lower part of link 4, forks 33 are fixed at the ends of posts 15, and in the upper part of link 5, forks 32 are fixed at the ends of posts 15, wherein the holes of fork 33 are aligned with the holes of fork 32 and fixed with the help of pin 11, in the upper part of link 5, on each post 15, ear 43 is fixed, the holes of which are aligned coaxially with the holes of fork bolts 47 fixed on spacer 25, the aligned holes are fixed with the help of pin 11,

working platform 1 is connected to links 3, 4 by aligning the holes of forks 16, 32 and brackets 20, which are secured to working platform 1, coaxially aligned holes are fixed using pin 11.

In addition, the front arc 6 and the rear arc 7 are made of curved metal pipes.

In this case, each step 13 is made of a pipe with ribbed pads 14.

In this way the technical result is achieved.

Simplicity of assembly, disassembly, possibility of compact folding of sections of the aviation stepladder is achieved due to the fact that forks are fixed on various elements of the aviation stepladder, the holes of which are aligned coaxially during assembly and fixed with studs 11. In the fastening units, a lower half-clamp 39 and an upper half-clamp 40 are used, into the eyes of which the forks of the corresponding elements of the aviation stepladder are inserted. For disassembly, studs 11 are removed and the sections of the aviation stepladder are folded.

Brief description of the drawings

The essence of the proposed utility model is explained by drawings:

Fig. 1 - General view of an aviation stepladder, front 3/4 view;

Fig. 2 - General view of the aviation stepladder, right side view;

Fig. 3 - Diagram of types of aviation stepladder;

In Fig.4 - Detail view A of Fig.3;

In Fig.5 - Detail view B of Fig.3;

In Fig.6 - Detail view of Fig.3;

In Fig. 7 - Detail view G of Fig. 3;

In Fig.8 - Detail view D of Fig.4;

Fig.9 - Detail view E of Fig.5;

Fig. 10 - Aviation stepladder testing diagram.

Explanations to the drawings:

Implementation of a utility model

The aviation stepladder (hereinafter referred to as the stepladder) in assembled form is a working platform 1, to which on one side a ladder 49 is attached, consisting of two links 2 and 3, wherein the lower link 2 is fixed on the front arc 6. And on the other side, a support part 50 is attached to the working platform 1, consisting of two links 4 and 5, wherein the lower link 5 is fixed on the rear arc 7. Link 2 and link 3 are connected to each other by means of spacers 10 and 25, diagonals 9 (Fig. 1, 2, 3). The front arc 6 and the rear arc 7 are made of curved metal pipes and represent U-shaped supports.

The ladder 49 consists of two links 2 and 3, lower and upper respectively, connected to each other (Fig. 5). Each link 2,3 is made of crossbars 24, connected to each other by steps 13 using rivets. On each crossbar 24, a fork 12 is riveted at the bottom, and a fork 16 is riveted at the top. Each step 13 is made in the form of a pipe with ribbed pads 14 for protection against slipping (Figs. 4, 5, 6). Link 3 is connected to the working platform 1 by coaxially aligning the holes (not shown) of the fork 16 and the bracket 20, which is fixed to the working platform 1, and then a pin 11 is installed in the holes.

The support part 50 consists of two links 4 and 5, each of which is made of two posts 15, which are connected by three crossbars 17 (Fig. 1). Post 15 of link 4 is connected to post 15 of link 5 by means of two forks 32 and 33, fixed by two pins 11 (Fig. 8, 9).

The crossbars 17 are riveted to the posts 15 with rivets 48 through the knees 44. The support part 50 is secured in the lower part to the rear arch 7 by means of forks in assembly 32 with studs 11 (Fig. 6). The working platform 1 of the stepladder has a rectangular shape and is made in the form of a flooring 19 with flanged holes 18 to prevent slipping (Figs. 4, 8). Four edgings 34 are secured along the perimeter of the flooring 19 with rivets 48. Four brackets 20 are placed on four sides in the corners of the working platform 1 for connection with links 3 and 4, in such a way that the holes of the forks 32 are aligned with the holes of the bracket 20 coaxially and are securely fixed with studs 11 (Fig. 8). Brackets 20 have holes for fixing handrails 21 using rivets 48.

On the working platform 1 along the perimeter two U-shaped handrails 21 are installed, which are connected to each other by means of three crossbars 36, fixed on the handrails 21 by means of brackets 35. On one side, two handrails 21 are connected by means of a diagonal brace 37. At the same time, on the other side, on each handrail 21 of the fence in the upper part brackets 35 are fixed, into which on both sides a folding crossbar 22 is inserted, equipped at the ends with fork screws with holes (not shown). The crossbar 22 is fixed on both sides by means of pins 23 (Fig. 4).

The connection of the lower front row of the step ladder is implemented as follows. Link 2 of the step ladder is fixed on the front arc 6. On link 2 in its lower part on each post 15 a fork 12 is fixed by means of rivets (not shown). Forks 12 are connected to the upper half-clamp 40 by means of studs 11. The assembled lower front bracket 46 is an upper half-clamp 40 and a lower half-clamp 26 (Fig. 7). The spacer 10 is fixed in the upper half-clamp 40 by means of a forked bolt 47. The lower half-clamp 26 and the upper half-clamp 40 bend around the front arc 6 and are connected to each other by means of screws 42. The front arc 6 has two supports 27 with rubber tips 38 for hangar servicing of aircraft with level floors. If necessary, they can be replaced with sharp peaks 28, for fixation when used on uneven surfaces, which are part of the stepladder and, during storage, are screwed into the sockets of the lower half-clamps 39 on the rear arc 7.

The connection of the lower rear row of the stepladder is implemented as follows. Link 5 of the stepladder is fixed on the rear arc 7. On link 5, on each post 15, a fork 32 is fixed from below using rivets (not shown) for fixing with the arc 7. Above the fork 32, an eye 43 is fixed, which is made in the form of a bracket with a flange and an opening for fastening the diagonal 9 and aligning the holes of the forked bolt 47 and the eye 43, the connection is fixed with the help of studs 11 coaxially (Fig. 6). The fastening element of the lower tier contains a lower half-clamp 39 with a peak 28 screwed into it and an upper half-clamp 40 with flanges for fastening the spacer 10 through the forked bolt 47 using a stud 11, and fixing with the fork 32 using studs 11 coaxially. The lower half-clamps 39 and the upper half-clamps 40 bend around the rear arc 7 and are connected using screws 42 (Fig. 6). At the end of the rear arc 7, two wheels 29 are installed in two U-shaped forks 30, intended for moving the stepladder and equipped with locking screws 31 (Fig. 1, 2).

The front 6 and rear 7 arcs are connected to each other using two spacers 10, which fix the upper 40 half-clamps on the rear 7 and front 6 arcs using pins 11 (Fig. 6, 7).

The connection of link 2 with link 3 of ladder 49 is realized in such a way that in the lower part of link 3, forks 12 are fixed at the ends of crossbars 24, and in the upper part of link 2, forks 16 are fixed at the ends of crossbars 24, while the holes of fork 12 are aligned with the holes of fork 16 coaxially, the aligned holes are fixed with the help of pin 11 coaxially (Fig. 2, 5).

The connection of link 4 with link 5 of support part 50 is realized in such a way that in the lower part of link 4, forks 33 are fixed at the ends of posts 15, and in the upper part of link 5, forks 32 are fixed at the ends of posts 15, wherein the holes of fork 33 are aligned with the holes of fork 32 and fixed with the help of pin 11 coaxially, in the upper part of link 5, on each post 15, ear 43 is fixed, the holes of which are aligned with the holes of fork bolts 47 coaxially, fixed on spacer 25, the aligned holes are fixed with the help of pin 11 (Fig. 2, 9).

The working platform 1 is connected to the links 3, 4 by aligning the holes of the forks 16, 32 and the brackets 20, which are secured to the working platform 1, the coaxially aligned holes are fixed with the help of the pin 11 coaxially (Fig. 2, 8).

To ensure the safety of these works, the stepladder undergoes static tests according to the test scheme, with a force of Pu for at least 10 minutes (Fig. 10).

When using an aviation stepladder, installation is performed as follows.

Link 2 is assembled by riveting two sides of the fork 12 and 16 to two crossbars 24, installing steps 13 with pads 14 and riveting them to crossbars 24.

Link 3 is assembled, for this purpose forks 16 and 12 are riveted to two crossbars 24 on one side in the lower part and steps 13 with overlays 14 are placed between the crossbars and riveted. Two forks 41 are riveted in the upper part.

Link 4 is assembled; for this purpose, three crossbars 17 are riveted to posts 15 through knees 44; forks 32 and 33 are riveted to the ends of posts 15 on both sides.

Link 5 is assembled; for this purpose, three crossbars 17 are riveted to posts 15 through knees 44, and forks 32 are riveted to the ends of posts 15. Eye 43 is riveted to the lower and upper parts of posts 15.

Links 2 and 3 are joined together. Links 4 and 5 are joined together. Links 2, 3 are joined to links 4, 5 respectively using transverse braces 9, spacers 25, and secured with studs 11. Then, work platform 1 is secured. The tips of fork bolts 47 installed on spacers 25 are tightened to maintain the correct stable position of the stepladder during operation.

Upon completion of the work and for transportation, the ladder is dismantled and the sections are folded, while the pins 11 are pulled out. When packing, the ladder sections are laid according to the packing scheme, when transported in the cargo cabin, they are fixed with shock-absorbing ties, which makes it possible to transport the ladder in the helicopter cabin and not depend on local service facilities when based on airfield sites.

The proposed design has a number of features and advantages compared to the prototype.

The stepladder is designed for working at height to perform aircraft maintenance work outside or inside the fuselage during maintenance, repair, installation and adjustment work, including inspection of the tail boom, stabilizer, intermediate and end gearbox, nose and central part of the fuselage, provides access to the radio compartment from inside the cargo cabin of the fuselage. The stepladder is supplied with the helicopter and is part of the ground handling equipment. The stepladder can be quickly disassembled for transportation in the helicopter cargo cabin and for operational forms of aircraft maintenance.

Claims (12)

1. An aviation stepladder comprising a working platform (1) equipped with a fence, which is secured to a ladder (49) on one side and to a support part (50) on the other side, characterized in that the ladder (49) is installed on the front arc (6), and the support part (50) is installed on the rear arc (7), the ladder (49) comprises two links (2, 3) connected to each other, each of which is made in the form of crossbars (24), in which steps (13) are fixed, while forks (12, 16) are fixed at the ends of the crossbars (24), the support part (50) comprises two links (4, 5) connected to each other, which are made in the form of posts (15), which are connected by means of crossbars (17), which are attached to the posts (15) by rivets (48) through knees (44), the link (2) of the ladder (49) is connected to the link (5) of the support part (50) by means of spacers (25) and diagonals (9), the front arch (6) is connected to the rear arch (7) by means of spacers (10), the working platform (1) is made in the form of a flooring (19), at the corners of which brackets (20) are fixed, into the openings of which handrails (21) are installed, which are connected to each other in pairs by means of three crossbars (36), on one side two handrails (21) are connected by means of a diagonal brace (37), while opposite on the other side on each handrail (21) of the fence in the upper part brackets (35) are fixed, into which on both sides a folding crossbar (22) is inserted, equipped at the ends with forked screws with holes, while the crossbar (22) is fixed on both sides by means of pins (23), the connection of the lower front row of the aviation stepladder is implemented in such a way that on the front arc (6) in two places a lower half-clamp (26) and an upper half-clamp (40) are installed, connected to each other, enveloping the front arc (6), while the holes of the eyes of the upper half-clamp (40) are aligned with the holes of the eyes of the fork (12), which is fixed at the bottom on the crossbar (24), on the inside in the eye of the upper half-clamp (40) a fork bolt (47) is fixed, fixed on the spacer (10), the aligned holes are fixed with the help of a pin (11), the connection of the lower rear row of the aviation step ladder is implemented in such a way that a link (5) is fixed on the rear arc (7), while on the rear arc (7) a lower half-clamp (39) and an upper half-clamp (40) are connected to each other in two places, enveloping the rear arc (7), while the openings of the lugs of the upper half-clamp (40) are aligned coaxially with the openings of the lugs of the forks (32), which are fixed at the bottom of the link (5) at the ends of the posts (15), on the inside in the lug of the upper half-clamp (40) a fork bolt (47) is fixed, fixed on the strut (10), the aligned openings are fixed with studs (11), in the lower part of the link (5) an eye (43) is fixed, in the opening of which a fork bolt (47) is installed, fixed on the diagonal (9), the aligned openings are fixed with the help of a stud (11), the connection of the link (2) with the link (3) of the ladder (49) is realized in such a way that in the lower part of the link (3) at the ends of the crossbars (24) forks (12) are fixed, and in the upper part of the link (2) at the ends of the crossbars (24) forks (16) are fixed, wherein the holes of the fork (12) are aligned coaxially with the holes of the fork (16), the aligned holes are fixed with the help of a pin (11), the connection of the link (4) with the link (5) of the support part (50) is realized in such a way that in the lower part of the link (4) at the ends of the posts (15) forks (33) are fixed, and in the upper part of the link (5) at the ends of the posts (15) forks (32) are fixed, wherein the holes of the forks (33) are aligned with the holes of the forks (32) and fixed with the help of a pin (11), in the upper part of the link (5) on each post (15) an ear (43) is fixed, the holes of which are aligned coaxially with the holes of the fork bolts (47) fixed on the spacer (25), the aligned holes are fixed with the help of a pin (11), the working platform (1) is connected to the links (3, 4) by aligning the holes of the forks (16, 32) and brackets (20), which are fixed on the working platform (1), the coaxially aligned holes are fixed using a pin (11). 2. An aviation stepladder according to item 1, characterized in that the front arc (6) and the rear arc (7) are made of curved metal pipes. 3. An aviation stepladder according to any of paragraphs 1 or 2, characterized in that each step (13) is made of a pipe with ribbed pads (14).