JPH0140053Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to improve the operating conditions of measuring instruments used underwater, such as measuring the flow velocity of running water or the speed of objects moving relative to water, and equipment for observing underwater. The present invention relates to a device for preventing tilting.

Conventionally, this type of device has the following features, as shown in Figure 1:
There is a structure in which an underwater measuring instrument 1 is suspended above the center of gravity by a rope 2, and a weight 3 is suspended below the center of gravity of the underwater measuring instrument 1. 4
and 5 are arrows fixed to the measuring device 1 and the weight, respectively, for directing them in the direction of water flow. In such a device, when the weight 3 retreats as shown by the dashed-dotted line due to the resistance of the water, the measuring device 1 itself also tilts as shown by the dashed-dotted line, making it difficult to properly face the measuring device 1 against the water flow. Since it is not possible to do this, there is an inconvenience that errors may occur in the measured values.

Furthermore, as a method for preventing such weight from affecting the measuring instrument, a device as shown in FIG. 2 is also known. In this device, an underwater measuring device 1 is rotatably attached to a support plate 6 on both sides of its center of gravity, and the rope 2 and weight 3 are attached to the support plate 6 instead of the measuring device. It is.
Therefore, even if the weight 3 moves backward as shown by the dashed line, the measuring device 1 itself can face the water flow correctly without being affected by the movement. However, in order to attach the support plate 6, a through hole H must be provided in the measuring device 1, which is disadvantageous in that it requires a large number of manufacturing steps and costs.

The present invention eliminates the drawbacks of the prior art and provides a device for preventing tilting of an underwater measuring instrument with a relatively simple configuration.

The embodiment of the present invention shown in FIG. 3 will be described in detail below. In the figures, members having the same or similar functions as those shown in FIGS. 1 and 2 are given the same reference numerals. 7 is a core rod suspended from the rope 2, and the measuring instrument 1 is fixed to this core rod 7 at its center of gravity. Further, a substantially U-shaped hook 9 that is pivotally supported at a fulcrum 8 is attached to the core rod 7 so as to be rotatable in the vertical direction without contacting the underwater measuring instrument 1. A column 10 for suspending a weight 3 is attached so as to be rotatable in the horizontal direction.

According to such a configuration, the hook 9 is rotatable around the fulcrum 8, so even if the weight 3 retreats due to the resistance received by the water flow, that is, the counterclockwise direction of the weight 3 is Even if movement occurs, the effect is absorbed by the rotational movement of the hook 9, so that the measuring device 1 can face the water flow direction correctly without tilting during use.

As described above, according to the device of the present invention, the inclination of the underwater measuring device during use is prevented, and as a result, a tilt prevention device is provided that does not cause measurement errors and can be manufactured at low cost with less manufacturing man-hours.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional underwater measuring instrument;
This figure is a side view of a conventional underwater measuring instrument equipped with a tilt prevention device, and FIG. 3 is a side view showing an embodiment of the present invention. 1... Underwater measuring instrument, 2... Rope, 3... Weight, 4, 5... Arrow feather, 6... Support plate, 7... Core rod, 8... Fulcrum, 9... Hook, 10... Prop.

Claims (1)

[Scope of utility model registration request] A tilt prevention device for an underwater measuring instrument for measuring flow velocity, which has a fletching for directing in the direction of the water flow and is suspended above the center of gravity by a rope; A hook whose upper end is pivotally supported on a fulcrum provided on the mandrel and is attached to the underwater measuring instrument so as to be rotatable in the vertical direction without contact; 1. A tilt prevention device for an underwater measuring instrument, comprising a weight rotatably mounted in a direction.