RU210821U1 - Retractable ladder for maintenance of contact network supports - Google Patents

Abstract

The utility model relates to equipment for lifting a person to a height, namely for servicing contact network supports. A retractable ladder for servicing contact network supports includes knees movably connected to each other, consisting of racks and steps, and two supports attached to the corresponding racks of the knee of the ladder by means of a swivel. Deviation from the pillars of the supports is regulated by the corresponding folding crossbars. At the same time, the supports are made rigid and are connected by means of a hinged connection to the upper part of the corresponding posts of the lower knee of the ladder. The lower knee is made with a length equal to or greater than the total length of the other knees in the unfolded state to ensure reliable installation on the supports, and the upper knee of the ladder is equipped with a folding footrest and a protective bracket made to cover the human body. The folding footrest can be made removable and can be removed and installed on the upper knee of the ladder at the required distance from the protective bracket, depending on the height of the person. allows you to protect a person working on a ladder from falling due to the use of fixing elements with a protective bracket at a height. 2 ill.

Description

The utility model relates to equipment for lifting a person to a height, namely for servicing contact network supports.

A sectional ladder is known (patent RU No. 2730222, IPC E06C 09/02, publ. 19.08.2020 Bull. No. 23), characterized in that it contains a base section, at least one connecting section, an upper section, a slider-type device with a stroke limiter , slide type device with free running and service platform;

the base section contains racks; steps; supports in support; means of fixation on the support; means for tensioning means for fixing and means for connecting with an adjacent section;

connecting section contains racks with steps; emphasis in the upper part of the racks for emphasis on the support; means of connection with an adjacent section; T-shaped rigid anchor line for slide-type devices, located along one of the racks; a synthetic cable, fixed on an emphasis with the formation of a loop and a winch located on the bottom of one of the racks;

the upper section contains racks with steps; stop with means of connection and tension in the upper part of the uprights for resting against the support and fixing on it; connections with the adjacent section, located at the bottom of the racks; T-shaped rigid anchor line for slide-type devices, located along one of the racks; a synthetic cable, fixed on the racks with rings to form a loop for the support and winch, located at the bottom of one of the racks; and hooks located on the bottom of each rack;

The sliding type device with a travel stop consists of an aluminum alloy guide of the slide type device with a travel stop, a locking eccentric with an eye, a mechanical locking pin for the slide type device with a travel stop, a band shock absorber sewn with polyamide threads, an oval carabiner, which is designed to fix the slide device type with a travel limiter to the chest anchor point of a safety harness;

The free-swing slider device consists of an aluminum alloy guide of the free-slider slider device, a locking eccentric with an eye, a mechanical locking pin of the free-slider type device, a band shock absorber sewn with polyamide threads, an oval carabiner, which is designed to fix the slider device type with free movement to the chest anchor point of the harness;

the service platform contains a fixation means and a platform.

The disadvantage of this ladder is its narrow scope due to rigid attachment to stationary structures, which will exclude its mobility (quick assembly and rearrangement to a new location).

The closest in technical essence is a retractable ladder for servicing contact network supports (patent for PM RU No. 200221, IPC E06C 01/12, publ. steps, height-adjustable supports, and the supports are made detachable, while the upper section of each support is attached to the corresponding post of the upper movable knee of the ladder by means of a hinged connection, and in the lower part it is detachably connected to the lower section of the support, the lower section of each support in the upper part is detachably connected with the upper section of the support, and in the lower part it is made telescopic and equipped with an element for fixing the sliding part in a given position.

The disadvantages of this ladder are the complexity of manufacturing, maintenance and low reliability due to detachable telescopic supports, as well as a high risk of injury due to the possibility of a person falling from a height, since there are no elements for fixing a person when working on a ladder.

The technical task of the proposed utility model is to create a simple and reliable design of a retractable ladder for servicing contact network supports.

The technical problem is solved by a retractable ladder for maintenance of the contact network supports, including movably interconnected knees, consisting of racks and steps, and two supports attached to the corresponding racks of the ladder knee by means of a hinged connection, and the deviation from the racks of the supports is regulated by the corresponding folding crossbars.

What is new is that the supports are made rigid and are connected by means of a hinge connection to the upper part of the corresponding posts of the lower leg of the ladder, and the lower leg is made with a length not less than the total length of the remaining knees in the unfolded state to ensure reliable installation on the supports.

In FIG. 1 shows a schematic general view of a retractable ladder.

In FIG. 2 shows a photograph of a retractable ladder.

A retractable ladder for maintenance of contact network supports, including a lower elbow 1 movably connected to each other (Fig. 1), at least one intermediate elbow 2 and an upper elbow 3, consisting of racks 4 and 5 and steps 6, and two rigid supports 7 and 8, attached from above to the respective uprights 4 and 5 of the lower knee 1 of the ladder by means of a swivel 9 (shown conditionally). The deviation from the racks 4 and 5 of the supports 7 and 8 is regulated by the corresponding folding crossbars 10 and 11. Moreover, the lower knee 1 is made not less than the total length of the remaining knees 2 and 3 in the unfolded state to ensure reliable installation on the supports without tipping over. From below, the racks 4 and 5 of the lower knee 1 and the supports 7 and 8 can be equipped with support elements (in Fig. 2 are shown conditionally, in Fig. 1 are not shown) to prevent a dip in the ground (if it is loose), which is supported in the working position. The authors do not claim the design of supporting elements.

Structural elements that do not affect the performance of the retractable ladder in the drawings (Fig. 1 and 2) are not shown or are shown conditionally.

The retractable ladder for maintenance of contact network supports operates in the following sequence.

In the folded (transport) position, when at least one intermediate elbow 2 (Fig. 1) and the upper knee 3 are lowered as much as possible down into the dimensions of the lower knee 1, the crossbars 10 and 11 and the supports 7 and 8 are pressed against the corresponding uprights 4 and 5 of the lower knee 1, the retractable ladder is delivered to the place of installation - to the support of the contact network (for example, for servicing contact connections at a height, replacing lamps, etc.). After that, it is transferred to the working position: the intermediate elbow 2 and the upper elbow 3 are extended up to the required distance to service the corresponding support of the contact network with fixation, for example, with clamps (patent for PM RU No. 200221), hooks (patent for PM RU No. 195866), ratchet mechanism (patent RU No. 2531710) or the like. Knees 2 and 3 can be extended from the lower maple manually (RU patents No. 95866, No. 2531710), using a manual rope winch (RU patent for PM No. 200221), a chain drive (see fire escape) or the like. The authors do not pretend to advance and fix methods, since they are known from open sources. From the racks 4 (Fig. 1) and 5 of the lower knee 1 of the ladder, by means of the corresponding hinge joints 9, they are diverted to ensure stability at an angle from each other along the ground 120 ± 30º relative to the racks 4 and 5, rigid supports 7 and 8, which are fixed by the corresponding crossbars 10 and 11. Crossbars 10 and 11 can be single-link (see Fig. 1), two-link (see Fig. 2) or telescopic (see patent for PM RU No. 200221). Since the lower knee 1 (Fig. 1) is made with a length not less than the total length of the remaining knees 2 and 3 in the unfolded state, the fastening of the rigid supports 7 and 8 to the upper part of the corresponding racks 4 and 5 of the lower knee 1 of the ladder completely eliminates its tipping even when the presence of a person - an employee at the top (Fig. 2), so the manufacture of folding and telescopic supports 7 and 8 does not make sense, which greatly simplifies the design of the stairs. At the same time, rigid supports 7 and 8 are much more reliable than collapsible ones in operation, and also easier to manufacture and maintain. After that, the retractable ladder, transferred to the working position, is brought close by the upper part (Fig. 1) of the upper knee 3 to the support of the contact network (Fig. 2). On steps 6 (Fig. 1) a person rises to the top of the stairs to service the support of the contact network (Fig. 2).

The proposed retractable ladder for servicing contact network supports has a simple and reliable design due to the use of rigid supports.

Claims (1)

A retractable ladder for maintenance of contact network supports, including knees movably connected to each other, consisting of racks and steps, and two supports attached to the corresponding racks of the knee of the ladder by means of a hinged connection, and the deviation from the pillars of the supports is regulated by the corresponding folding crossbars, characterized in that the supports are made rigid and are connected by means of a hinged connection to the upper part of the corresponding racks of the lower knee of the ladder, and the lower knee is made with a length not less than the total length of the remaining knees in the unfolded state to ensure reliable installation on the supports.

Images