JPS6146424Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless hoist scale, particularly to an antenna of a weight detecting section thereof.

A rod-shaped whip antenna is used as the antenna used in the wireless transmission section of the weight detection section of a wireless hoist scale, but the length of the whip antenna is generally made long so as not to be obstructed by the hook of a hoist crane or chain block. Because of this, they are often damaged by hoisting wires from hoist cranes or chain blocks.

The present invention is aimed at solving such problems, and one embodiment thereof will be described below based on the drawings.

In FIGS. 1 and 2, a weight detecting section 3 interposed between a hook 1 such as a hoist crane or a chain block and an object to be weighed 2 is a load cell 4 that outputs a weighing signal corresponding to the applied load value. , a wireless transmitter 6 that converts the weighing signal into a wireless signal and transmits it from the transmitting antenna 5, and a battery 7 that drives these.The weight display section 8 that displays the load value is connected to the wireless transmitter. a wireless receiving section 10 that receives a radio signal from the section 6 with a receiving antenna 9 and demodulates it to extract the weighing signal; and a weight indicating section 11 that displays the weighing signal as a weight value.
It is made up of. The transmitting antenna 5 is composed of at least two loop antennas, upper and lower, which horizontally surround the weight detecting section 3 suspended from the hook 1 at upper and lower positions. For this reason, this loop antenna 5 also serves as a guard ring to protect the wireless transmitter 6 and battery 7, which are normally placed on both sides of the load cell 4, and protect them from damage that is likely to occur due to a collision with the outside. . In this case, the loop antenna 5 is arranged so as to surround the weight detecting section 3, so that the directivity of the antenna is different from that of the wireless transmitting section 6 and the battery 7.
It is not affected by Note that one loop antenna may be used, and the others may be configured as guard rings.

FIGS. 3 and 4 show another embodiment, in which guard rings 12 are disposed in at least two upper and lower positions surrounding the wireless transmitter 6 and the battery 7 in the upper and lower positions in the horizontal direction, and the transmitting antenna 13 is connected to the guard ring. It is composed of dipole antennas installed in the vertical direction between the upper and lower guard rings 12 at multiple locations around the guard ring 12. Therefore, this dipole antenna 13 forms part of the guard ring, and the directivity of the antenna is not affected by the wireless transmitter 6 or the battery 7, as in the case described above.

As described above, according to the present invention, a loop antenna or a dipole antenna is provided by at least two upper and lower guard rings that horizontally surround the wireless transmitter and the battery in the upper and lower positions, or by spanning between the guard rings at multiple locations around the guard rings. Since it also serves as a part of the guard member, it can be made cheaper, and since it is located in a position that surrounds the wireless transmitter and battery,
The directivity is not affected by the wireless transmitter or the battery, and there is no fear that it will be damaged by hanging wires of hoist cranes or chain blocks.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional schematic diagram of a hoist scale showing one embodiment of the present invention, Fig. 2 is a plan view of its weight detection section, and Fig. 3 is a front view of the weight detection section showing another embodiment. FIG. 4 is a plan view thereof. 3... Weight detection unit, 5... Loop antenna, 6
...Radio transmitter, 7...Battery, 12...Guide ring, 13...Dipole antenna.

Claims (1)

[Scope of utility model registration request] A guard member having at least two upper and lower guard rings that horizontally surrounds the wireless transmitter and the battery included in the weight detection unit of the wireless hoist scale in the upper and lower positions is provided, and the guard member is provided with the guard ring or at a plurality of locations around the guard ring. A wireless hoist scale characterized in that a part of the guard member extending vertically between the guard rings is constituted by a loop antenna or a dipole antenna for transmission of the wireless transmitter.