JPH0253589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an instrument to be operated at a high place, that is, a portable mast such as an antenna mast, and particularly to a jib whose lower column member is divided into three or more parts.
That is, the present invention relates to a telescoping portable mast which is supported on the ground by a support pillar and which can be extended and contracted by a drive device specific to the mast.

Portable masts of this type, in particular antenna masts, are used as movable support devices for instruments to be operated at various positions and heights. For this type of portable mast, stability, bending strength, torsional strength, assembly time, etc. are essentially important. Bending strength relates to the degree of deflection of the portable mast within its extended limits, torsional strength is important for as precise as possible adjustment of the equipment to be operated, and both also relate to wind loads at any given location. It is for.

The above-mentioned mobile mast is publicly known, for example, the instruction manual "Salz Guitar Antenna Mast" W343-677
According to -1000G, a jib pivotable about a vertical axis is freely connected to a bottom cradle, which supports a lower column member on the one hand and is configured as a car on the other hand. As a driving method for expanding and contracting the column members, there is a hydraulic piston mechanism provided in the lower column member, which causes each column member to expand and contract in sequence. Additionally, there is another hydraulic drive on the bottom cradle for uprighting the folded portable mast. This known portable mast has several deficiencies. The lower column member is supported at its lower end only by the bottom frame. The deflecting forces acting on the mast, especially the wind forces, not only impose stress on the column members upwards, but also the bottom sections of the column, which are fully deflected on the one hand and torsionally stressed on the other.
Known masts can only be used at limited heights when the limits of deflection are known and the instrument to be operated and the supported antenna must be adjusted as precisely as possible. Otherwise, a separate mast tension rope is required. The bending and torsional moments acting on the mast, ie the lower column member, are transmitted through the foot of the mast to the bottom cradle in known examples. The use of tension ropes, especially for various heights, reduces assembly time (the amount of work required to get the mobile mast in place and in working order) and disassembly time (the time required to remove the mobile mast). In addition, the increase in the amount of work time required to install the product in a condition suitable for transportation cannot be ignored. If you try to increase the assembly and disassembly time,
Due to the respective expansion and contraction of the individual column members and the layout of the known mast, dry running of the piston structure is unavoidable.

The invention provides simple, particularly easy handling means,
The object is to provide a telescoping mobile mast which increases stability, in particular bending and torsional strength, thereby increasing the height of the mobile mast without tensioning wires, and further reduces assembly and disassembly times. .
This is achieved in the present invention as follows. In other words, a jib is formed as a telescopic support pillar, its telescoping parts are fixed to each other each time the expansion and contraction is adjusted, and the upper end of the support pillar is fixed above the lower pillar member so that the axis does not shift. They are freely connected by a moving housing, the longitudinal axis of which is perpendicular to the longitudinal axis of the column member, and a tension rope is connected to the lower end of the telescoping part of each support pedestal, and the other end of the tension rope is connected to the lower column member. The lower end of the support pedestal facing the ground is connected to an individually adjustable height adjustment device, each with an associated support leg.

With the above configuration, the following can be achieved. That is, the lower column member is firmly supported over its entire length, so that only a small bending stress due to the wind load is applied to the lower column member, and there is almost no upward deflection of the lower column member.
Therefore, almost perfect bending strength can be achieved even when the mobile mast is fully extended. With the pivoting housing fixed to the shaft by means of the universal joint of the support pedestal, the following features are achieved: That is, the torsional moment generated by the torsional stress generated at the lower part of the column member is dividedly transmitted to the support column and appears as a controllable bending moment. This bending moment is reduced at the support pedestal and divided by the support pedestal. Even if the given height remains the same, the torsional moment acting below the column member is already damped at the upper end of the lower column member, thereby essentially increasing the torsional strength of the mast. This is a substantial improvement in the stability of the mobile mast. At this time, a large spread of support can be achieved by expanding and contracting the support pillars. Increased bending strength, torsional strength and stability increase on the one hand the achievable height of a mobile mast within given deflection limits and on the other hand a greater extension of the mobile mast without auxiliary tension lines. height can be achieved. Assembly and disassembly times can therefore be significantly reduced. Installation of the portable mast is facilitated by the elasticity of the support pedestals.
After erecting the unextended mast,
Extend the support pedestal manually or with an extension device until the tension line is fully tensioned. The mast will then be fully supported in the manner described. The portable mast can then be extended to the desired height. Once the lower end of the support pedestal has been installed, in conjunction with the previously mentioned features, the support pedestal is first stretched until the tension line is taut, and then the adjustment device allows for precise adjustment and the final The tension line will be completely stretched. This achieves improved stability, bending strength and torsional strength for perfect operation, resulting in improved stability of the extended portable mast arrangement.

This is similar to the portable mast method described above, but the mast does not have its own drive and is connected to the legs by means of a tension line which should be freely connected to the top of the lower post member, on a fixing ring which is itself known. There is no support pedestal that can be changed in length. Apart from the lack of elasticity of the support pedestal, this known device does not have any universal joints in the support pedestal, so although it is possible to improve the bending strength to some extent, the torsional moment created at the bottom of the column member is cannot be transmitted to the supporting column. In particular, since it is never possible to transmit rotational movements to the support pedestals, the known method requires additional fixed coupling elements between the support pedestals in order to achieve the required stability.

The universal joint of the support pedestal on the pivoting housing, which is a feature of the invention, ensures accurate feeding of the support pedestal, ensures that the support leg of the support pedestal grips the ground,
Create a polygonal structure on the ground resulting from the number of supporting legs.

According to an embodiment of the invention, the stepless delivery of the column member allows reliable column operation without the need for separate handle operations for each delivery adjustment. This can be applied to the respectively appropriate driving of various ropes, for example a rope driving a telescopic mast section or a rope threaded at the lower end of a continuous column. This type of rope drive can also be applied to mounting column members in an unextended state or fixed to each other in an unextended state in an upright manner with their lower ends on a bottom mount. With the support pedestal and adjustment device of the present invention, the bottom pedestal is raised off the ground. As a result, the bottom frame only hangs from the lower pillar member.
The weight of the bottom cradle thereby increases the stability of the portable mast. In this case, on the one hand, the entire unit consisting of the bottom cradle or undercarriage and the mobile mast with the support device is operational, and on the other hand, the weight of the undercarriage contributes to the stability of the mobile mast.

Next, the illustrated embodiment in which the present invention is applied to a movable antenna mast will be described in detail.

The telescopic portable mast 1 has a lower column member 2 and five mutually extendable column members 3. The columns 2 and 3, as shown in FIG. 2, are preferably designed with a square cross section and are expediently designed as lattice columns. Above the lower column member 2, that is, here at the upper end of the lower column member 2, four telescopic support columns 4 are connected by universal joints 5 at angles of 90°. The telescoping parts of the support pedestal 4 are fixed to each other in an arbitrary extended position by a suitable method, for example a bolt fixing device with a split pin. This fixing device is not shown in the drawing for simplicity. A supporting pedestal 4 is shown schematically in the drawing, which is equipped with a suitable telescoping device, for example a hydraulic pressure regulating device.

The lower end of each support pedestal 4 is connected to a tension rope 6, and the other end of the tension rope 6 is fixed to the lower part of the lower column member 2 at a certain distance from the universal joint 5 of the support pedestal 4. has been done. This is only shown schematically at 7 in the figure.

Furthermore, the lower end of the support pedestal 4 directed toward the ground is
Each adjustment device 8, ie an adjustment spindle with a crank handle in the illustrated embodiment, is connected to a device that allows the lower support pedestal with the support base 9 to be adjusted separately in height.

The lower end of the lower column part 2 is furthermore connected to a bottom cradle 10, which at the same time is designed as the carrier of the mobile mast.

2 to 4 show the universal joint 5 between the lower column member 2 and the support column 4, which characterizes the invention. Each support pedestal 4 is provided with a pivot housing 14 at its upper end. The pivot housing 14 of each support pedestal 4 is rotatably mounted on a bearing bolt 15, as seen in FIGS. 3 and 4. The bearing bolt 15 is supported by a side plate 16 fixed to the lower column member 2. This side plate 16 also acts as a stop for the axial movement of the rotary housing 14. As a result, this pivot housing 14 is fixed against axial displacement. The longitudinal axis of the pivot housing 14 or the bearing bolt 15 is perpendicular to the longitudinal axis of the mast, ie horizontal to the ground.

In this embodiment, the mast of the mobile mast has a square cross-section and is provided with four support pedestals. The arrangement according to the invention may be a circular, in particular cylindrical, column element, as well as a column element of polygonal cross section, with supporting columns arranged at equal intervals around its periphery, even if the number is different. It is sufficient if the lower column member is provided with a universal joint corresponding to those shown in FIGS. 2 to 4. The universal joint of the support pedestal is a pivot housing that is fixed against axial displacement.

The stepless expansion and contraction drive of the column member 3 of the portable mast 1 is equipped with a rope drive. As an example, only the rope 11 is depicted for simplicity. The upper end of the rope 11 is attached to the lower end of the first telescopic member 3, passes over a guide roller 12 at the upper end of the lower column member 2, and is finally guided to a winch 13 installed on the bottom frame 10. The winch 13 can be controlled in order to effect the respective desired height adjustment, ie the draw-out adjustment shown here, and at the same time it is possible to fix the rope 11. Similarly, ropes in driving connection with each column member 3 are provided between successive column members 3. Ropes of this type are known and are not shown in order to simplify the drawing. As a rope drive, for example, a threaded rope can also be used. This is to pass a rope between the upper and lower ends of the continuous column members 2 or 3 in a single or multiple manner. Ropes of this type are known per se and will not be described here either. It is clear that with the help of a rope of this kind the portable mast can be raised steplessly to the desired height and must be fixed at this height by means of a winch control. No special handling is required.

[Brief explanation of the drawing]

Fig. 1 is a side view of the telescopic portable mast according to the present invention, Fig. 2 is a plan view of the mast without the upper mast, and Fig. 3 is the lower mast shown in Fig. 2. FIG. 4 is an enlarged cross-sectional view of the universal joint portion of the support pedestal attached to the top of the member; FIG. 4 is a side view of the universal joint portion shown in FIG. 3; 1...Extendable mobile mast, 2...Lower column member,
3... Column member, 4... Support pedestal, 5... Universal joint, 6... Tension rope, 7... Tension rope fixing point, 8... Adjustment device, 9... Support stand, 10...
Bottom frame, 11... Drive rope, 12... Guide roller, 13... Winch, 14... Rotating housing, 15... Bearing bolt, 16... Side plate.

Claims (1)

[Scope of Claims] 1. The lower column member can be supported at a fixed position from the ground by at least three jibs arranged at regular intervals along its outer periphery, and the column member can be extended and contracted from the lower column member by a mast drive device. , the jib is formed as a telescopic support pedestal, and the telescopic part of the support pedestal can be fixed each time the expansion/contraction adjustment is made. The pivot housing is rotatably connected to a side plate attached to the upper end of the column member so as not to move in the direction of its longitudinal axis, and the longitudinal axis of the pivot housing and the bearing bolt is perpendicular to the longitudinal axis of the mast. , the lower end of the lower telescopic part of each support pedestal is connected to a tension rope, the other end of the tension rope is fixed below the lower pillar member, and the lower end of the support pedestal directed toward the ground is connected to the support base; A telescoping mobile mast, such as an antenna mast, in which the support base is equipped with an adjustment device so that the length of the support pillars can be adjusted separately, and the lower pillar member is fixed to the bottom mount. 2. The telescoping portable mast according to claim 1, wherein the column member is steplessly expandable and retractable by rope drive, and a cable winch is installed as a rope drive device on the bottom pedestal supported by the lower column member. . 3. The telescoping portable mast according to claim 2, wherein the bottom frame is formed as a traveling chassis for the portable mast, and is coupled to the lower end of the lower column member.