JPH0662328U - Platform scale - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a platform scale that has a simple structure and is relatively inexpensive while maintaining the same precision as conventional ones. [Structure] A mounting table 5 and four load detectors 6 (only one is shown in FIG. 1) supporting the mounting table 5 are provided.
One end 13 of each of the load detectors 6 of the table is fixedly coupled to the reinforcing body 9 of the mounting table 5, and the other end 16 of each of the load detectors 6 is separated from each other to form a free end. A retractable horizontal setting tool 7 is provided at each of the other ends 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a platform scale using a load cell.

[0002]

[Prior art]

 Some of the conventional platform scales described above are disclosed in Japanese Utility Model Publication No. 1-29543. As shown in FIG. 5, this platform scale has four load cells 2 provided at four corners of the upper surface of a base 1, and load transmission shafts 3 projecting from the upper surface of each load cell 2. And, the structure is such that the plate 4 is supported by the four load transmission shafts 3. A strain gauge is adhered to each load cell 2, and the load applied to the plate 4 can be detected by this strain gauge to measure the weight.

[0003]

[Problems to be solved by the device]

 Conventionally, there has been a demand for a relatively inexpensive platform scale without lowering the accuracy of the scale. However, in the above-mentioned conventional platform scale, the load cell 2 is fixed to the base 1, and therefore the base 1 is required. This base 1 increases the processing cost, and the component management of the base 1 (good product, It is necessary to check the quality of defective products and manage inventory. The weight of the base 1 increases the weight of the entire platform scale, which makes it difficult to handle the platform scale.

An object of the present invention is to provide a platform scale that has a simple structure and is relatively inexpensive while maintaining the same accuracy as in the past.

[0005]

[Means for Solving the Problems]

 The present invention comprises a mounting table and a plurality of load detectors for supporting the mounting table, wherein one end of each of the plurality of load detectors is fixed and coupled to the above-mentioned mounting table, The other end of each of the plurality of load detectors is separated from each other to form a free end, and a retractable horizontal setting tool is provided at each of the other ends.

[0006]

[Action]

 When the platform scale of this invention is placed on the floor, for example, a plurality of load detectors serve as legs to support the platform. Then, the mount can be set horizontally by expanding and contracting the horizontal setting tool provided for each load detector. Since each load detector can be brought into contact with the floor surface via the horizontal setting tool, it is possible to reduce an error in weighing accuracy. In addition, the platform scale is lighter than the conventional platform scale because the base is omitted.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the drawings, 5 is a mount, 6 is a load detector, and 7 is a horizontal setting tool. As shown in FIGS. 1, 3 and 4, the mounting table 5 has a substantially square planar shape, and has a box-shaped cover 8 that opens downward and is housed inside the cover 8. And a reinforcing body 9 formed in a "T" shape. As shown in FIG. 3, the reinforcing body 9 is arranged so that the four corners are located at the central portions of the side walls 10 of the cover 8.

The load detector 6 is formed by attaching a plurality of strain gauges (not shown) to a conventionally known load cell 12 having an opening 11 in the central portion, and as shown in FIG. A total of 4 units are fixed and attached to 9. As shown in FIG. 2 and FIG. 3, each load cell 12 has one end 13 fastened to the outer surface of the side wall 14 of the reinforcement body 9 at substantially the center by bolts 15 and 15, and the other end 16 of the load cell 12. Is the free end. Then, as shown in FIG. 3, the center lines of the four load cells 12 pass through the center point 17 of the mounting table 5 such that adjacent ones form an angle of 90 degrees with each other.

As shown in FIG. 2, the horizontal setting tool 7 includes a bolt 18 and a pedestal 19, and is provided on the other end 16 of each of the four load cells 12, that is, on the free end side. The bolt 18 is screwed into a screw hole provided on the lower surface of the mounting member 20, and is fixed to the mounting member 20 by a nut 21. The mounting member 20 is fastened to the end portion 16 of the load cell 12 with a bolt 22. Then, as shown in FIG. 2, a spherical portion 23 is provided on the lower surface of the head of the bolt 18 of the horizontal setting tool 7, and the spherical portion 23 is a concave portion provided on the upper surface of the pedestal 19. It is rotatably fitted. That is, the bolt 18 is attached to the pedestal 19 so as to swing freely.

Next, the operation of this platform scale will be described. When this platform scale is used, for example, if it is installed on the floor, the four load detectors 6 serve as legs to support the platform 5. Then, the mounting table 5 can be set horizontally by expanding and adjusting the bolts 18 of the horizontal setting tool 7, and the respective load detectors 6 can be securely attached to the floor surface via each horizontal setting tool 7. Can be brought into contact with. Next, when the article to be weighed is placed at a position substantially at the center 17 of the platform 5 of the platform scale thus installed, the load moments in the direction along the vertical plane, etc. are applied to the four load cells 12 respectively. Since the force works, but the horizontal force does not work, the weight of the article can be accurately measured.

Then, when an article is placed on the platform 5, the platform 5 bends, whereby the load cell 12 shown in FIG. 2 is tilted by a small angle in the lower right direction. 23 rotates with respect to the pedestal 19. By this rotation, it is possible to prevent a decrease in weighing accuracy due to the load cell 12 tilting by a small angle.

However, although the number of the load detectors 6 provided with the horizontal setting tool 7 is four in the above embodiment, the number of load detectors 6 can be three or five or more. Further, the level setting tool 7 is provided on all of the four load detectors 6, but it may be provided on two or three load detectors 6 instead of being provided on all four.

Further, the horizontal setting tool 7 is not limited to the one shown in FIG. 2, and other conventionally known ones may be used. For example, although the pedestal 19 is provided in the above embodiment, the spherical portion 23 may be directly contacted with the floor surface without providing the pedestal 19. Further, although the horizontal setting tool 7 is provided in the above embodiment, the horizontal setting tool 7 can be omitted when it is installed and used on a substantially horizontal surface. In the above embodiment, the load gauge is bonded to the load cell 12 to form the load detector 6, but other known load detectors such as a piezoelectric element may be used.

[0014]

[Effect of device]

 The platform balance of the present invention has a configuration in which the base 1 of the conventional platform scale is omitted by fixing and coupling the respective load detectors to the mounting table. As a result, the processing cost of the base 1 can be reduced, and the parts management of the base 1 (quality check of defective products, defective products, inventory control, etc.) is not required, so that the cost can also be reduced. There is. Further, by omitting the base 1, it is possible to reduce the weight of the platform scale, which has an effect that the platform scale can be easily handled. In addition, when the article to be weighed is placed on the platform, the force applied to the load detector is almost the same as that of the conventional platform scale, and therefore it is said that it is possible to ensure approximately the same weighing accuracy as the conventional scale. There is an effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a main part of a platform scale according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the load detector of the same embodiment seen from the AA direction in FIG.

FIG. 3 is a plan view of the platform scale of the embodiment.

FIG. 4 is a front view of the platform scale of the embodiment.

FIG. 5 is a vertical sectional view of a conventional platform scale.

[Explanation of symbols]

 5 Mounting base 6 Load detector 7 Horizontal setting tool 8 Cover 9 Reinforcement body 12 Load cell 18 Bolt 19 Pedestal

Claims (1)

[Scope of utility model registration request] 1. A mounting table, and a plurality of load detectors for supporting the mounting table, wherein one end of each of the plurality of load detectors is fixedly coupled to the table. A platform scale, characterized in that the other ends of the plurality of load detectors are separated from each other to form free ends, and a retractable horizontal setting tool is provided at each of the other ends.