EA037342B1 - Telescopic mast - Google Patents

Abstract

The invention relates to radio communication systems, in particular, to telescopic masts of various antenna units. A telescopic mast comprising a fixed section and movable sections located in the fixed section, wherein each section is fitted with boxes, each movable section has a locking device as a trip pawl with a roller installed in it, characterized in that the locking device of each movable section is fitted with a spring-loaded lever interacting with a clamp installed on a movable section, and the box has a cavity made for the roller locking. An insert can be located in the cavity to ensure more reliable securing. This allows for reliable fixing of sections as assembled and extended, and for arrangement of sequential extension from the external sections to the internal ones, and their retraction in the inverse order, regardless of unfavorable environmental conditions. This design also allows for placing all telescopic mast movable parts within its enclosed volume, which prevents any probability of the mechanism damage during operation.

Description

The invention relates to radio communication systems, namely to telescopic masts of various antenna installations.

Known telescopic mast (TM) with a locking device containing spring-loaded stops and guide bushings attached to the lower part of the movable section and on the upper part of the fixed section. In order to increase the reliability of fixing the sections of the mast to each other and to reduce its dimensions in the folded state, grooves are made along the perimeter of the outer surface of the movable section, in each of which an axis is fixed, and the spring-loaded stops are made in the form of an L-shaped lever, on one shoulder of which an oval hole is cut, in where the specified axis is located (ed. St. USSR SU 562889, publ. 06/25/1977, bull. No. 23).

However, this device does not provide reliable operation of the mast, because it is exposed to external factors. For example, in the event of icing, the shutter may become inoperable. An external auxiliary device is also required to remove from the stopper.

Known locking device for telescopic mast sections (US patent US 9574590, publ. 05/10/2013 WO2013 / 067330), containing a two-armed lever and a lock, fixed on the upper part of the movable section, and a locking plate placed on the upper part of the stationary section. The disadvantage of this device is its location outside the TM sections. This increases the likelihood of accidental damage during operation, as well as exposure to adverse weather conditions, as a result of which the locking device may fail. The device allows the mast to unfold in order from inner to outer sections and to fold in the opposite order, which makes the mast unstable to bending loads during lifting and lowering, and also complicates the work with the guys.

The closest technical solution (prototype) is a blocking shutter, described as part of a telescopic mast (ed. St. USSR SU 251028, publ. 08.26.1969 Bul. No. 27). The blocking shutter is equipped with a swinging lever with a roller at one end and a protrusion at the other end, resting on a spring-loaded cup connected to a cable of the lifting mechanism.

However, this design does not provide a secure fit. Moisture and dirt can accumulate in the closed cavities of the mechanism, which does not exclude the possibility of icing and, as a result, unstable operation of the shutter. In case of unfavorable external conditions, breakage of the glass spring or loss of its elastic properties, the glass may not block the swinging arm with the wheel, or vice versa, remain open when the sections are lowered, which will not allow the mast sections to collapse or fix.

The technical result to which the invention is directed is a reliable fixation of the sections in the assembled and extended position. The proposed design makes it possible to organize the sequential extension of the sections in order from outer to inner and their folding in the reverse order, regardless of unfavorable external conditions. It also allows you to place all the moving parts of the TM within its closed volumes, which eliminates the likelihood of damage to mechanisms during operation.

The technical result is achieved by the fact that in a telescopic mast consisting of a fixed section and movable sections placed in it, housings are installed on each of the sections, a locking device in the form of a dog with a roller installed in it is mounted in each of the movable sections. A spring-loaded lever is installed in the stopping device of each movable section, interacting with a bracket mounted on the movable section, and a cavity for the roller stopper is made in the body.

FIG. 1 shows the locking device in the folded position of the TM sections, FIG. 2 shows the position of the elements of the locking device at the moment of locking the roller on the TM body, FIG. 3 shows the position of the elements of the locking device at the moment of locking the roller against the TM body and the insert placed in it.

The telescopic mast contains (see Fig. 1) a lever 1, spring-loaded 2, a roller 3 installed in a pawl 4. The TM consists of a stationary section 5, along the inner surface of which the roller 3 moves, the first movable section 6 containing a stopper, the second the movable section 7 and the third movable section 8. The second movable section 7 contains the bracket 9, and the third movable section 8 contains the bracket 10. In the extreme extended position (see Fig. 2) of the first movable section 6 TM the pawl 4 is in the cavity 11 of the housing 12 TM, in which the roller 3 is locked. For more reliable fixation, an insert 13 is placed in the cavity 11 of the TM housing 12 (see Fig. 3).

The device works as follows.

In the folded position of the TM sections (see Fig. 1), the lever 1 spring-loaded by the spring 2 fixes the lower part of the bracket 9 of the second movable section 7 TM of a smaller diameter than the diameter of the first movable section 6 TM. Thus, when raising or lowering the TM, the extension or folding of the sections is carried out in the order described below.

The extension of the sections is as follows. The first movable section 6 TM, located inside the fixed section 5 TM, slides with its surface along the inner surfaces of the fixed section 5 TM, while the roller 3 installed in the pawl 4 of the first movable section 6

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TM, rolls on the inner surface of the stationary section 5 TM. The lever 1 in this position presses on the pawl 4 with its curved surface, pressing the roller 3 against the surface of the stationary section 5 TM, and is unable to turn into the open state. At the moment when the first movable section 6 TM has moved towards the second movable section 7 TM at a given distance, the roller 3 is opposite the cavity 11 of the housing 12 TM (see Fig. 2) and falls into it, and the lever 1 turns, releasing the bracket 9 the second movable section 7 TM. Then the roller 3 abuts against the inclined surface of the housing 12 TM and stops. The lever 1, under the influence of the bracket 9, is thus rotated to the extreme position and is held by the spring 2 in such a way that it presses the pawl 4 and does not allow it to turn so that the roller 3 can come out of the cavity 11 of the housing 12 TM. The first movable section 6 TM is fixed in a stationary state, and the second movable section 7 TM begins to move out according to the same principle.

For more reliable fixation with a large load on the body 12 TM, transmitted from the roller 3, an insert 13 is placed in the cavity 11 of the body 12 TM (see Fig. 3). In this case, the roller 3 installed in the pawl 4 abuts against the inclined surface of the insert 13 installed in the TM body 12 and stops. In this case, the lever 1 is rotated to the extreme position and is held by the spring 2 so that it does not allow the pawl 4 to turn in such a way that the roller 3 can leave the cavity 11 with the insert 13 installed in the TM body 12.

Folding sections is as follows. Lever 1 of the locking device is held by a spring 2. The second movable section 7 TM moves towards the first movable section 6 TM, while rests with its bracket 9 against the recess of the lever 1, turning it so that its curved surface stops pressing the pawl 4. The second movable section 7 TM presses on the stopper of the first movable section 6 TM, while the first movable section 6 TM begins to move together with the second movable section 7 TM. Roller 3, installed in pawl 4, begins to roll along the inclined surface of the 12 TM body, and the pawl 4 slides along the profile of the lever 1. In the case when the insert 13 is placed in the cavity 11 of the TM 12 body 12, the roller 3 begins to roll along the inclined surface of the insert 13. Then the roller 3, installed in the pawl 4, rolls along the inner surface of the fixed section 5 TM, while the profile of the pawl 4 and the profile of the lever 1 of the locking device engage in such a way that the pawl 4 fixes the lever 1, which in turn fixes the bracket 9 of the second movable section 7 TM.

From now on, the sections move together in both directions.

Thus, the proposed design of the telescopic mast provides reliable fixation of the sections in the assembled and extended position. Also, the proposed design allows you to organize the sequential extension of the sections in order from outer to inner and their folding in the reverse order.

Claims (2)

CLAIM 1. Telescopic mast, consisting of a fixed section and movable sections placed in it, bodies are installed on each of the sections, a locking device in the form of a dog with a roller installed in it is mounted in each of the movable sections, characterized in that in the locking device of each movable section a spring-loaded lever with a curved profile and a recess is installed, interacting with a pawl made with the possibility of sliding along the profile of the lever or its recess, and with a bracket mounted on an adjacent movable section with a smaller diameter, and a cavity for a roller stopper is made in the body of the stationary section. 2. Telescopic mast, consisting of a fixed section and movable sections placed in it, bodies are installed on each of the sections, in each of the movable sections a locking device is mounted in the form of a dog with a roller installed in it, characterized in that in the locking device of each movable section a spring-loaded lever with a curved profile and a recess is installed, interacting with a pawl made with the possibility of sliding along the profile of the lever or its recess and with a bracket mounted on an adjacent movable section with a smaller diameter, and in the body of the stationary section there is a cavity for a roller stopper, in which additionally the insert is placed.