JPH0543522Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the falling of an elevating antenna, particularly of an elevating antenna of a device for measuring interference waves generated from electric and electronic devices such as televisions, radios, and videos, automobiles, and other devices.

In interference measurement equipment, when the receiving antenna is raised and lowered using cables such as ropes, wires, timing belts, etc., these cables may break or become loose due to some action, and in this case it is necessary to support the antenna. Accidents are likely to occur, such as the cursor falling and being damaged, or malfunctions in position detection of the antenna.

According to the present invention, these accidents can be prevented and measurements can be made safely and smoothly.

This will be explained below along with examples.

The antenna 1 is attached to a cursor 3 that is guided and supported by an antenna mast 2 so as to be movable up and down.
Each of the jamming radio waves is received at a predetermined height position on the mast.

The cursor is hollow so as to be guided and supported around the antenna mast as shown in Fig. 3, and rollers 5 provided in notches 4 at the top and bottom ends of the cursor are in contact with the peripheral surface of the antenna mast so as to smoothly ascend and descend. A groove 6 is formed on the peripheral surface of the cursor, into which the engagement wall surface 8 of the two-split antenna support member 7 is fitted.
These are connected by bolts 9 etc. At one end of the support member (left side in Figs. 1 and 2), a worm 11 slidably fitted to an antenna pivot rod 10 by a key, key groove, concaves and convexes etc. is provided in a groove 12, and a worm wheel 14 supported on a side plate 13 meshes with this worm wheel. The antenna 1 is attached to the worm wheel shaft 15, and the antenna rotates horizontally and vertically by the forward and reverse rotation of the rod 10. A protruding portion 16 is formed at the other end of the support member 7, and below this are provided a spring case 17 and a stop lever 19 pivotally attached to the cursor 3 by a pin 18. The pin is inserted into a pivot hole 20 in the stop lever,
The wire 22 for raising and lowering the cursor is supported between pieces 21 fixed to the cursor. One end of the wire 22 passes through a hole 23 in the stop lever 19 and is fixed to the underside by welding or a fixing device 24, and the other end passes through a hole 25 in the spring case 17 and a hole 26 in the protruding part of the support member to be connected to the upper pulley 2.
7 and wound around the lower drum 28.

The drum is rotated by a motor 29 connected thereto via an appropriate reduction gear such as a worm gear and a transmission. When the antenna is raised, when the raising pushbutton switch 30 is pressed, the electromagnetic switch 31 is activated and the motor rotates normally. At this time, the stop lever 19 is pulled upward by the wire 22, and the spring 32 in the spring case is pulled upwardly by the wire 22.
is compressed, and the teeth 33 fixed to the end of the stop lever are separated from the side surface of the antenna mast.

When lowering the antenna, press the lowering push button switch 3.
When 4 is pressed, the electromagnetic switch 35 is activated and the motor reverses. At that time as well, the teeth of the stop lever are separated from the side surface of the mast.

When the wire 22 is cut or loosened, the stop lever 19 is pushed down and rotated by the spring 32 in the spring case, and the teeth 33 of the stop lever bite into the antenna mast to prevent the cursor supporting the antenna from falling. prevent. The wire 22, which was under tension at that time, loosens, causing the limit switch 36 in contact with it to break, and the relay 37 to operate, stopping the rotation of the motor. If overload occurs, thermal relay 38
works.

In the illustrated example, the upper end of the spring case is fixed to the protrusion of the support member, so that the spring case does not move when the stop lever is operated. The teeth side of the stop lever may be formed into a wedge or the like as appropriate.

FIG. 9 shows a case in which the antenna is raised and lowered by a timing belt 38 as a cable instead of the wire 22, and the belt and the stop lever 19 are connected by the lever operating wire 39, and the timing belt is indirectly fixed to the stop lever. ing.

When an eccentric shaft portion 41 is formed on the roller shaft 40 as shown in FIG. 7, the position of the roller relative to the antenna mast can be adjusted by rotating the roller shaft 40 and deflecting the eccentric shaft portion 41. can.

The present invention is constructed as described above, and when the cable is cut or loosened, the lifting antenna is fixed to the antenna mast by the operation of the stop lever to prevent the lifting antenna from falling;
Damage to equipment and accidents can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway schematic sectional view, Fig. 2 is an enlarged plan view of the antenna support member, Fig. 3 is an enlarged front view with the cursor partially omitted, and Fig. 4 is a partially cutaway schematic sectional view. The figure shows an enlarged bottom view of the cursor.
The figure is an enlarged front view of the stop lever, Fig. 6 is a side view of the stop lever, Fig. 7 is an enlarged front view of the roller shaft, Fig. 8 is a wiring diagram, and Fig. 9 is a partially cutaway schematic cross section showing another example. It is a diagram. 1 is an antenna, 2 is an antenna mast, 3 is a cursor, 7 is an antenna support member, 19 is a stop lever, and 32 is a spring.

Claims (1)

[Scope of utility model registration request] It has an antenna and is movable up and down on the antenna mast by the operation of a cable such as a wire, and is provided with a cursor that is guided and supported so as to surround the periphery of the antenna mast, and the cursor can be engaged with the side surface of the antenna mast. A stop lever is pivotally mounted, one end of the rope is fixed directly or indirectly to one end of the stop lever, and when the rope breaks or loosens, the other end of the stop lever is attached to the side of the antenna mast. A fall prevention device for an elevating antenna that is equipped with a spring that urges it to rotate in the direction of biting.