RU170992U1 - The mechanism for actuating the limit switches of the telescopic mast - Google Patents

Abstract

Utility model телескоп The mechanism for actuating the limit switches of a telescopic mast ʺ can be used in antenna technology, as well as in other telescopic type retractable devices with electric control. The device contains a spring-loaded lever, mounted on the base of the mast, with the possibility of its interaction, when moving upwards - with the limit switch of the highest upper position of the sections and, accordingly, when moving down - with the limit switch of the extreme lower position of the sections. A rack is pivotally connected to the lever, which is mounted vertically with the possibility of moving up / down along the common axis of the sections, the rack is passed into the openings of the lower parts of all the movable sections of the EHU, and on this rack there are two protrusion stops, with the possibility of interaction of each of them with the lower part corresponding extreme movable mast section.

Description

The utility model relates to elements of telescopic telescopic mast, namely, to the mechanisms for actuating the limit switches. The technical solution can be used in antenna technology, as well as in other telescopic type retractable devices with electric control.

In modern engineering, various types of limit (limit, trip) switches are widely used, which are electrical devices used in drive control systems of various types as sensors that generate an electrical signal when a movable node of a controlled mechanism reaches a certain position (a review article is available on the Internet resource http://www.elec.ru/articles/kontsevye-vykljuchateli/). In sliding mast devices, limit switches, as an integral part, are included in the design to ensure that the lifting / lowering drive is switched off when the sections of the specified devices reach their extreme positions in operational or emergency conditions. However, despite the wide variety of types of limit switches, their use in the designs of telescopic mast devices, due to their specifics, is hampered by access to moving units - internal sections, the coordinate of which is subject to control. An example is the technical solution of a telescopic mast according to patent RU 2198131 of 02/10/2003, which is taken as a prototype of a utility model. In the prototype, according to its description, the movement of the telescopic sections up and down is limited by two limit switches, the mechanism of interaction of which with the moving sections of the mast is not described and is not obvious. However, when the limit switches are arranged in accordance with the description and illustrations of the specified patent, the limit switches are not triggered in the two extreme positions of the telescoping mast sections. In addition, outside the mast, there is a need for electric wires connecting the limit switches to the control unit of the telescopic mast, which is a disadvantage of the prototype.

The inventive utility model "The mechanism for actuating the limit switches of the telescopic mast" is intended for use in the telescopic mast as part of its design. When using a utility model, the following set of useful technical results is achieved:

1. Ensures the absence of wires located in the areas of movement of the sections both inside and outside the mast.

2. During the repair process, a single access is provided to both limit switches and to the mechanism of their activation.

The essence of the claimed utility model lies in the fact that the mechanism for actuating the limit switches of the telescopic mast contains a spring-loaded lever, mounted on the base of the mast, with the possibility of its interaction, when moving upwards - with the limit switch of the highest upper position of the sections and, accordingly, when moving down - with limit switch of the lowermost position of the sections located on the same base. A rack is pivotally connected to said lever, which is mounted vertically with the possibility of moving up / down along the common axis of the sections. The rack is passed into the openings of the lower parts of all the moving sections of the mast, and on this rack two protrusions-stops are made, with the possibility of interaction of each of them with the lower part of the corresponding extreme mobile section of the mast.

In FIG. 1 shows a local section of a five-section telescopic mast in the direction of sight ʺAʺ (see Fig. 4) on the activated limit switch of the extreme upper position and the mechanism for actuating it. Only the lower sections are shown.

In FIG. 2 shows a local section of a five-section telescopic mast in the direction of sight ʺBʺ (see Fig. 4) on the activated limit switch of the lowermost position and the mechanism for putting it into action. Only bottom sections shown

In FIG. 3 shows the spring-loaded lever of the mechanism for actuating the limit switches of the telescopic mast in isometry.

In FIG. 4 shows a top view along the arrow of the gaze ʺBʺ (see Fig. 1) on both limit switches and on the elements of the mechanism for bringing them into action.

The mechanism for actuating the limit switches of the telescopic mast contains a spring-loaded lever (1), which is mounted on the base (2) of the telescopic mast inside its stationary outer section (not shown). When moving upward, the lever (1) has the ability to interact with the limit switch (3) of the extreme upper position - FIG. 1, FIG. 4, and when moving downward, respectively, with the limit switch (4) of the lowermost position - FIG. 2. In particular, the lever (1) can be cantilevered inside the base (2) by means of a flat spring (5), with the possibility of its deflection up / down - Fig. 4. Limit switches (3) and (4), like the lever (1), are mounted on the base (2) inside the outer section of the telescopic mast. In the middle position, the lever (1) does not interact with the switches (3) and (4). Such a property of the lever (1) can be provided by a corresponding bend of its edges or protrusions facing the limit switches - FIG. 3. A vertical strut (7) is connected to the lever (1) by means of a hinge (6), which is passed into the holes of the lower bushings (8), (9), (10), (11). On the stand (7) two protrusions (12) and (13) are made. The upper protrusion (12) of the strut (7) freely passes into the openings of the lower parts of all the movable sections, with the exception of the extreme movable section with the largest radial size, i.e. that section, which is covered by the stationary section and extends last, and retracts - first of all, i.e. the upper protrusion (12) of the strut (7) does not pass into the hole of the lower sleeve (8) - FIG. 1. The lower protrusion (13) of the strut (7), in turn, freely passes into the holes of the lower parts of all the movable sections, with the exception of the extreme movable section with the smallest radial size, i.e. the inner section, which is advanced first, and retracted - last, i.e. the lower protrusion (13) does not extend into the hole of the lower sleeve (11) - FIG. 2. The preferred cross-sectional shape of the strut (7) is a rectangular shape that provides centering of the strut in the rectangular holes of the lower bushings (8) and (11) of the extreme movable sections. The tensile spring (14) serves the same purpose, which presses the strut (7) against the edge of the hole in the sleeve (8), for example, through communication with the ring (16) loosely worn on the mast spindle (15) or through another connection. The holes in the lower bushings (9) and (10) of the remaining sections can be of any shape, in particular round, of sufficient size for the passage of both protrusions (12) and (13) of the strut (7) without hindrance.

The mechanism for actuating the limit switches of the telescopic mast works as follows. In the folded state of the mast, the lower sleeve (11) of the inner movable section presses on the lower protrusion (13) of the stand (7), which, through the hinge (6), deflects the lever (1) down, which leads to its interaction with the limit switch (4) of the lowermost the position and operation of this switch - FIG. 2. When the mast drive is turned on, the lead screw (15) starts to rotate, as a result of which the internal movable section through the nut located in the sleeve (11) progressively moves vertically upward. In this case, the upper protrusion (12) of the strut (7) freely passes into the hole of the sleeve (11), as well as into the holes of other bushings (9) and (10) of the moving sections of the mast, with the exception of the hole in the lower sleeve (8) of the extreme moving section with the largest radial size, i.e. the section that is covered by the fixed section and is the last to be extended. The upper protrusion (12) of the strut (7) is hooked to the lower sleeve (8) of this section, deflecting the lever (1) upwards, which leads to its interaction with the limit switch (3) of the extreme upper position and the operation of this switch - FIG. 1. When the mast drive is reversed, the lead screw (15) starts to rotate in the opposite direction, as a result of which the movable sections are progressively vertically downward through their lower bushings. In this case, the lower protrusion (13) of the strut (7) freely resembles the hole of the bushings (8), (9), (10), with the exception of the hole in the sleeve (11) of the section that is internal and extends first, and retracts - last of all. The sleeve (11) presses on the lower protrusion (13) of the rack (7), deflecting the lever (1) down, which leads to its interaction with the limit switch (4) of the extreme lower position and the operation of this switch - Fig. 2. With the intermediate position of the sleeve (8) above the lower protrusion (13) of the rack (7), this rack receives the possibility of a slight deviation outward, turning on the hinge (6), which does not impair the operability of the mechanism, but reduces its reliability under specific operating conditions, for example in the presence of vibration, which can lead to bounce and failure of the hinge (6). This deviation is prevented by a tension spring (14), which presses the strut (7) against the inner edge of the hole in the sleeve (8) through communication with the ring (16) freely worn on the spindle (15).

The inventive utility model meets the criterion of industrial applicability, since currently there are all the technologies and components necessary for its production.

Claims (4)

1. The mechanism for actuating the limit switches of the telescopic mast, containing a spring-loaded lever, mounted on the base of the mast, with the possibility of its interaction, when moving up - with the limit switch of the upper position of the sections and, respectively, when moving down - with the limit switch of the lower position sections located on the same basis; a rack is pivotally connected to the lever, which is mounted vertically with the possibility of moving up / down along the common axis of the sections, the rack is passed into the openings of the lower parts of all movable sections, and on this rack there are two protrusion stops, with the possibility of interaction of each of them with the lower part of extreme movable mast section. 2. The mechanism for actuating the limit switches of the telescopic mast according to claim 1, characterized in that the spring-loaded lever is cantilever mounted inside the mast base by means of a flat spring with the possibility of its up / down deflection and a central hole is made in it, into which the lead screw is freely passed. 3. The mechanism for actuating the limit switches of the telescopic mast according to claim 1, characterized in that the rack and holes of the lower parts of the extreme movable mast sections are made rectangular. 4. The mechanism for actuating the limit switches of the telescopic mast according to claim 1, characterized in that the rack is connected by means of a tension spring with a ring loosely worn on the lead screw.

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