FR2719070A1 - Temporary, telescopic mast for picking up radio signals in areas of poor reception - Google Patents

Abstract

The mast has a series of sections which slide into each other (7, 13, 14, 15). The base section (7) is the largest and as the winch (61) on the base is used, the next section (13) is pulled out and this in turn pulls out the adjacent section (14). There is a second winch (62) which raises the base section (7) from a horizontal to a vertical position. The upper end of each of the sections (13, 14, 15) is attached to cables (9) which are the right length to support the mast when it is erected.Each of the sliding sections (13, 14, 15) has a pulley (131, 141) on its outer and upper edge through which a cable (11) passes. The cable is attached to the upper end of the lower section and to the lower edge of the upper adjacent section. The cable goes through a hole (132, 142, 152) and is attached to the lower section by a clamp. The mast can be circular or square.

Description

TELESCOPIC MAT

  The present invention relates to a telescopic mast, in particular to allow reception of radio signals by an antenna in the collected sites5 or for any other application requiring the

  raising an object from the ground.

  I1 is known, in the field of antennas, masts of greater or lesser height depending on the need

  crossing an obstacle to receive signals10 from transmitters.

  However, in the event of sporadic use, it is not necessary to leave in place such devices which depreciate the landscape. In addition, the higher the masts, the more they offer wind resistance and in case of a storm it may be necessary to dismantle them. The object of the present invention is to provide a mast which allows rapid and easy deployment so as to

  overcome the drawbacks of the prior art.

  This object is achieved by the fact that the telescopic mast having a plurality of sliding elements one inside the other and of which that of the base is of largest section, each element adjacent to another being of section adapted to slide in the previous and serve as a guide to the next, is characterized in that a winch located on the base allows the extraction of the immediately adjacent element and in that the extraction of this element causes the drive of

  extracting the next item and so on.

  According to another particular feature, a second winch allows the erection of the base, from the horizontal and retracted mast position, to the vertical position where the

  mast can be deployed by the first winch.

  According to another feature, the upper end of each sliding element is connected to

  shrouds of determined length corresponding approximately to the distance required during erection and deployment of the mast.

  According to another particularity, each sliding element comprises on the external surface of its upper end a pulley over which passes a cable attached on the one hand to the upper end of the sliding element in which the previous slides and on the other to the lower end of the sliding element which slides in the previous one. According to another particular feature, the cable enters the lower part of the sliding element through an opening and is attached to the lower part by a stirrup and made integral with the section of the tube.

the sliding element.

  According to another particularity, the section of the tube of each sliding element is alternately square

or circular.

  Other characteristics and advantages of the present invention will appear more clearly on

  reading of the description below made with reference to

  attached drawings in which: - Figure 1 shows a front view of the telescopic mast deployed; - Figure 2 shows a sectional view of the lower sliding element; - Figure 3 shows a sectional view of the two sliding elements immediately adjacent to the base element; - Figure 4 shows a sectional view of the two adjacent elements forming the last part of the telescopic mast; - Figure 5 shows a bottom view of the cable attachment detail; - Figure 6 shows a sectional view of a tube for viewing the cable attachment detail;

  - Figure 7 shows a side view of the mast.

  The invention will now be described in conjunction with Figures 1 to 7. In Figure 1 we can see the telescopic mast of the invention in its erected position. This telescopic mast is formed by a pivoting base (7) in which a first sliding element (13) slides, inside which a second sliding element (14) slides. A last sliding element (15) slides in this second element (14). The end of the last element (15) comprises fixing means which will allow the mounting, for example of an antenna (16). Each sliding element, with the exception of the last (15), has at its upper end a support at the end of which is mounted a pulley (131) for the sliding element (13) and respectively (141) for the element sliding (14) and (12) for the fixed element (7). A first winch (61) is mounted integral with the base (7) and the cable (17) of this winch passes around the pulley (12), enters the lower part of the tube (13) through an orifice such as that shown in Figure 6 for the tube (15) and will attach to a bracket identical to that shown in Figure 6 for the tube (15) by the reference (153). The element (13) also comprises at its upper part a pulley (131) over which passes a cable (11) which is fixed, by means (10), on the one hand to the upper end of the element base (7) and, on the other hand, a bracket from the lower end of the adjacent sliding element (14) which slides inside the tube (13). Similarly, the sliding element (14), adjacent to the first sliding tube (13), has at its upper part a pulley (141) over which passes a cable (11) which is fixed by means (136), of a part at a fixed point of the upper end of the lower sliding element (13) and secondly to the stirrup (153) of the lower end of the adjacent upper sliding element (15). Each upper end of each sliding element (15, 14, 13) is connected to the ground by shrouds

  (9) of determined corresponding length approxima-

  the length required to hold the telescopic elements when they are fully extracted and erected. These shrouds are attached to the ground by means (8) allowing adjustment of the tension over a small range. The base tube (7) is for example, as shown in FIG. 2, of square section and the upper adjacent element (13) is, for example, of circular section and has two corners (134, 135) made integral from its circular section (13) at the bottom, these two corners serving as a guide in the square section and as a stop in the extraction position to limit extraction and avoid

  disengagement of the sliding element (13) from the base (7).

  These stops (70, 71) consist of screws (70, 71) screwed into the tube (7) of square section to prevent the extraction of the corners (135, 134) welded on the tube (13) of circular section when the latter is practically extracted from the base (7). The base (7) also has in its upper part two welded angles (76) arranged in the perpendicular diagonal

  at the corners (135, 134) to serve as a guide for the tube (13).

  Figure (3) shows the sections of the two adjacent sliding tubes (13, 14). The second tube (14) being of square section and inscribed in the first tube of circular section (13). At its base, quarter-rounds (145) allow the tube (14) to slide and guide into the first (13). Two pieces (136) are added to the upper part of the first tube (13) arranged symmetrically with respect to an axis of symmetry and in a direction perpendicularly opposite to the quarter circle (145) to serve as upper guide for the side walls of the second tube. (14) square section. The passage of the cable (11) takes place, for example, in a hole formed in a plate (136) and the space left free between the tube (13) and the tube (14) and then enters the tube (14 ) by an orifice identical to the orifice

(152) shown in Figure 6.

  Similarly, the sliding of the last cylindrical section tube (15) in the second square section tube (14), shown in Figure 4, is allowed by angle-shaped elements (155) welded to the lower base of the last tube (15) and angle-shaped plates (146) made integral with the upper part of the second tube (14), so as to allow guiding of the cylindrical element (15). The cable passing over the pulley (141) enters the space available between the second tube (14) and the last tube (15) and then

  pass through the orifice (152) formed at the base of this tube.

  In Figure 7 we can see that the base of the telescopic mast (7) is pivotally mounted on a fixed base (3) comprising a bracket (51) on which the pivot axis (50) of the base (7) is articulated. This base (3) also supports a pulley (31) over which passes the cable (18) of a second winch (62), which cable (18) is attached by its other end to the upper end of the base ( 7). By operating the second winch (62), the base (7) is straightened from the horizontal position in which the mast is fully retracted and horizontally, towards the vertical position where the base (7) is ready to allow the deployment of other sliding elements. By actuating the winch (61) when the sliding elements are retracted in the base (7), the element (13) is deployed, which causes the element (14) to deploy by the action on the cable ( 11) of suitable length and by the displacement of the point (131) relative to the attachment point (10) thereby causing the element (14) to exit, which also causes, by the displacement of the point (141), the exit of the sliding element (15). The cable lengths (11) are studied and adapted to the lengths of the telescopic elements (13, 14) so as to cause this phenomenon of cascade extraction by the unique action of the user on the cable (17) which is the only to be driven indirectly by the winch (61) to act on

  the first sliding element (13).

  The elements (146, 136) also constitute stops limiting the extraction of the upper element (15), respectively (14) relative to the sliding element

  lower (14), respectively (13).

  When the lower elements have additional guide elements (155, 145) at their base and plumb with the plates (146, 136), a telescopic mast is easily produced with the

minimum material means.

  Other modifications within the human reach of

  trade are also part of the spirit of the invention.

  So the number of sliding elements can be increased

or reduced.

Claims (6)

  1. Telescopic mast comprising a plurality of sliding elements (7, 13, 14, 15) one inside the other and of which that of the base (7) has the largest section, each element adjacent to another being of section adapted to slide in the previous one and serve as a guide for the next one, characterized in that a first winch (61) situated on the base allows the element (13) to be extracted immediately adjacent and in that the extraction of this element (13) causes the extraction of the next element (14) and so on. 2. Telescopic mast according to claim 1, characterized in that a second winch (62) allows the erection of the base (7), from the horizontal and retracted mast position, towards the vertical position o the   mast can be deployed by the first winch (61).   3. Telescopic mast according to claim 2, characterized in that the upper end of each sliding element (13, 14, 15) is connected to shrouds   (9) of determined corresponding length approxima-   the distance required during erection and deployment of the mast.   4. Telescopic mast according to any one of   previous claims, characterized in that each   sliding element (13, 14) comprises on the external surface of its upper end a pulley (131, 141) over which passes a cable (11) attached on the one hand to the upper end of the sliding element in which the preceding slide and on the other hand at the lower end of the sliding element which backstage in the previous one.   5. Telescopic mast according to claim 4, characterized in that the cable penetrates into the lower part of the sliding element by an orifice (132, 142, 152) and is attached to the lower part by a stirrup (133, 143, 153) and made united by means   (10, 136) of the section of the tube of the sliding element.   6. Telescopic mast according to any one of the preceding claims, characterized in that the   tube section of each sliding element (7, 13, 14,   ) is alternately square or circular.