JPS6130176Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device for a register box in a water meter.

It is necessary to prevent the parts inside the metering chamber of a water meter installed at a consumer from being touched maliciously. For this reason, conventionally, as shown in FIG. 1, in an upper case 3 for fixing the register box 1 to the lower case 2 side, and an upper case 3 screwed onto the lower case 2, as shown in FIG. After the case 3 is screwed and assembled into the lower case 2, a fixing screw 4 is screwed from the outside of the upper case 3 so as to engage with both cases 2 and 3. It was locked so it couldn't be easily seen. However, in this case, a common hole for screwing the fixing screw 4 must be carved in a subsequent process, which is extremely time-consuming, inefficient, and leads to high costs. Moreover, since this process of drilling the screw holes and screwing them together is a process that takes place after the water meter is completed, it is easy for the product to be defective, and the fixing screws can be found if you look closely with malicious intent, and they are also easy to remove. . Furthermore, if the fixing screw is removed for inspection or the like, there is a drawback that it is difficult to align both screw holes when screwing it back together.

The purpose of the present invention is to propose a simple locking device that eliminates the above-mentioned drawbacks, namely:
A narrow groove 5 that is open at the top is formed between the lower outer circumferential surface of the register box 1 that is fitted during assembly and the upper inner circumferential surface of the lower case 2, and the register box 1 located in the groove 5 is Engagement grooves 6 and 7 are provided in the circumferential direction on the outer peripheral surface and the inner peripheral surface of the lower case 2.
are provided so as to face each other, and an arcuate locking spring 8 having a thickness that can be moved in and out of the groove 5 is fitted into both the engagement grooves 6 and 7. It is something.

In the embodiment shown in the drawings, the groove 5 is formed by cutting out a part of the outer peripheral surface of the register box 1, but the groove 5 may be formed on the lower case 2 side. Further, the engagement groove 6 on the side of the register box 1 is formed in a part of the outer periphery like the groove 5 described above. The locking spring 8 uses a steel wire or a plate spring. 9 in the figure indicates a packing. Reference numeral 10 denotes a jig for attaching and detaching the locking spring 8, which is formed to have the same arc and width as the groove 5 so that it can be inserted into the groove 5, and is formed by two plates 10a and 10b, front and back. The distance l between the lower end surface of the front plate 10a and the lower end surface of the back plate 10b is the same as the distance l between the lower end surface of the groove 5 and the upper surface of the engaging grooves 6 and 7. There is.
Further, the lower end of the surface plate 10a is formed into an upwardly curved arcuate surface 10c.

Due to the structure described above, when assembling, in order to fit the register box 1 into the lower case 2, the locking spring 8 is assembled into the register box 1, and while holding the locking spring 8 with the attachment/detachment jig. Fit the register box 1 into the lower case 2. After that, the attachment/detachment jig 10 is pulled out. As a result, the locking spring 8 expands across the locking grooves 6 and 7, and the register box 1 is locked. after that,
The packing 9 is placed and the upper case 3 is screwed onto the lower case 2. Further, when the register box 1 is to be separated for inspection or the like after assembly, the attachment/detachment jig 10 is inserted into the groove 5 in the same manner as described above. As a result, the locking spring 8 is linearly extended by the arcuate surface 10c formed at the lower end of the attachment/detachment jig 10 and pushed into the engagement groove 6 side. Therefore, by pulling up the register box 1 in this state, the register box 1 is moved together with the locking spring 8 to the lower case 2.
You can leave more easily.

Due to the structure described above, in the present invention, the register box can be locked during assembly by simply inserting the locking spring 8, which makes the work much simpler and more efficient than the conventional one. In addition, costs can be reduced. Moreover, the locking part is hidden by the upper case, and even if the upper case is removed, its structure cannot be easily determined, and furthermore, removing the lock requires a special jig or a special member such as a thin plate that can be used to remove it. It is difficult to remove easily. Moreover, it can be easily unlocked using a special jig during inspection after installation. Furthermore, the locking structure is simple and is extremely effective in practice.

[Brief explanation of the drawing]

Fig. 1 is a partially cut-away front view of a water meter showing the part to which the locking structure of the present invention is applied, Fig. 2 is a sectional view showing a conventional locking device, and Fig. 3 is a side view showing the groove of the register box. Figure 4 is the same plan view, Figure 5
6 is a partial sectional view showing the assembled state, FIG. 7 is a plan view of the same, FIG. 8 is a plan sectional view of the groove, and FIG. 9 is a perspective view of the attachment/detachment jig. 10th
The figure is a front view of the same, and FIG. 11 is a bottom view of the same. 1...Register box, 2...Lower case,
3... Upper case, 5... Groove, 6, 7... Engagement groove, 8... Locking spring.

Claims (1)

[Claims for Utility Model Registration] 1. A narrow groove 5 which is open at the top is formed between the lower outer circumferential surface of the register box 1 and the upper inner circumferential surface of the lower case 2, which are fitted together during assembly. Engagement grooves 6 and 7 in the circumferential direction are provided on the outer peripheral surface of the register box 1 formed in the groove 5 and on the inner peripheral surface of the lower case 2, respectively, so as to face each other. 7. A locking device for a register box in a water meter, characterized in that a locking spring 8 is interposed between the register box 7 and the locking spring 8 that engages with both grooves. 2 The engagement of the locking spring 8 with the engagement grooves 6 and 7 is as follows:
A locking device for a register box in a water meter according to claim 1, which is implemented using a jig 10.