SU1745580A1 - Collapsible ladder of hoist device - Google Patents

Abstract

The invention relates to a lifting machinery industry, namely to self-propelled boom cranes of predominantly large carrying capacity, having a highly positioned turntable with crane mechanisms and devices placed on it, and relates to ladders for lifting the operator into the work area. The purpose of the invention is to increase convenience and safety in operation and reliability in work about The ladder of a self-propelled boom crane consists of a supporting upper section and a sliding lower upper section fixed to the platforms by a hinge 6 and comprises a railing and steps on the bottom surface of the upper section of the guide foldable fence mounted two units. 13 il.

Description

The invention relates to lifting and transport machinery, mainly to self-propelled jib heavy-duty cranes, having a high-positioned turntable with mechanisms and devices placed on it.

The purpose of the invention is to improve the convenience and safety in operation and reliability in operation.

Figo 1 shows a self-propelled boom crane with a retractable ladder in the transport position, side view; On fire 2 - working platform of the crane with a retractable ladder in the working position, front view; on Lig 3 - a staircase in the transport position, side view; in fig. 4 is a view A of FIG. 3; Fig 5 - section BB

in fig. four; on big 6 - section B-B in FIG. four; FIG. 7 shows the node I in FIG. 4; FIG. 8 - node II in FIG. 4; in fig. 9 - in working position, - side view; FIG. 10 — node III in FIG. 9; in fig. 11 is a view of FIG. 12 in FIG. 12 - a section dD in FIG. 10; Fig about 13 - section EE on the boom self-propelled crane 1

mounted with a cleaning ladder consisting of telescopically folding upper 2 and lower 3 sections of rods 4 connected by cross-beams 5. The upper part of the upper section 2 is fixed by means of a hinge 6 on the platform 7 of the crane 1 in a vertical plane and fixed in working position by means of a stop

one

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of two links 8 and 9. One end of the earth fence 8 by means of the hinge 10 is connected with the upper part of the upper section 2 and installed in its longitudinal notch 11, and the other end through the hinge 12 is connected with the second link 9, the free end of which is made with two consecutive openings 13 and 14 for fixing the stop on the lower section 3 in the working position of the ladder and the upper section 2 in the transport position folded in the recess 11

Each crossbar 5 of the lower section 3 is made up of two parts 15 and 16 that are hinged between each other, of which part 15, which is a leg support, is mounted on section 3, and part 16 is movable along the longitudinal grooves 17 made in the rods 4 of section 30 Fixing the ladder in the transport position is carried out by a 18 "clamp

To bring the ladder into working position, the clamp 18 is retracted, freeing the hole 14, fixing the stop, and then fixing it in the hole 13. Around the hinge 6 rotate the ladder to the supporting plane of the turntable. At the same time, the upper section 2 of the ladder takes the original working position. Again, the stop is released, releasing the hole 13, while the lower section 3 extends under its own weight along the rods 4 of the upper section 2, after which the end of the link 9 of the support is fixed in the hole 14 of the lower section 2,

Turning the support pads 15 for the legs around the hinges 19, place them in the working position. In this case, the ends of the other part 16 of the crossbar in the longitudinal grooves 17 in the rods A move up to the stop and fixed by means of the bolts 20. After the telescopic railing 21 is extended and fixed, the ladder is ready for operation

The staircase is brought to the transport position in the reverse order.

The design of the stairs provides a convenient ascent for the maintenance personnel from the ground to the highly located

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the platform of a heavy heavy-duty crane allows working with the telescopically retracted lower section in case it is necessary to place loads near the crane at the site, and also easily and quickly fold and remove the ladder to the dimensions of the crane

Claims (1)

Invention Formula Cleaning ladder of a truck, mainly a self-propelled jib crane, containing upper and lower sections je from rods interconnected by rods, interconnected with the possibility of moving and fixing one relative to another and mounted on the crane platform can be rotated relative to the hinge in the upper part of the upper section, and the stop for limiting the rotation of the sections in the working position, differing in that, in order to increase convenience and safety in operation and reliability in operation, the sections are mounted one relative to the other telescopically, the stop for limiting the rotation of the sections in the working position is performed of two links, the first of which is at one end pivotally connected to the upper part of the upper section and installed in a longitudinal recess made in it from the rear side, and at the other end at the hinge with a second link, the free end of which is made with two successive openings for fixing the said stop on the lower section in the working position of the ladder and the upper section of the transport position along the hole nearest to the end of the link and on the upper section of the hole farthest from the end of the link in the working position Intermediate position: Fixing the second section inside the first one, and each of the crossbar lower sections is made of folding parts of two pivotally interconnected parts, one of which, being a supporting platform for the legs, is mounted on the section pivotally and the other is movable along the longitudinal grooves made in the section bars. 55 thirty 35 40 45 50 with wasps 1L w chg gI X1 I Busa 1Bx # FIG $ .J Have ten 21 L g 20 r & -: Jl 12 FIG. 7 6 1745580 in- in eleven FIG. 6 9 R (Rig 10 LL Schi P Ass g Wue.11 HER Schi 13