JP4816585B2 - Electronic balance / electronic scale - Google Patents

Description

The present invention relates to an electronic balance / electronic balance which is a weighing device, and more particularly to an electronic balance / electronic balance having a protective wall surrounding the periphery of a weighing pan.
The electronic balance / electronic scale here detects the weight weight of the object to be measured as an electrical signal, including electronic balances equipped with an electromagnetic force balance mechanism, load cell type, tuning fork type, capacitance type, etc. This includes the entire weighing device that measures, and these are collectively referred to as an electronic balance.

  Electronic balances that accurately measure a small amount of objects include a transparent windshield case that covers the upper space of the weighing pan on which the weighing object is placed in order to prevent measurement errors caused by air flow (Patent Literature). 1).

  In addition, a general-purpose electronic balance that can be used for a wide range of applications is also provided so that it can be used for measurement objects that are not significantly affected by the air flow around the weighing pan. As shown in FIG. 8, the electronic balance does not include a windshield case that covers the upper space of the weighing pan 4, and the weighing pan 4 is formed to be exposed to the outside on the upper surface of the balance body 1.

Conventionally, as shown in FIG. 8, a protective cover 11 made of a transparent synthetic resin that can cover the upper surface and the peripheral side surface of the balance body 1 with the weighing pan 4 exposed is provided at the time of sale. It is provided as an option and used by being placed on the balance body 1. In many cases, the protective cover 11 is attached and fixed to the balance body 1 via a double-sided tape 15.
JP 08-136333 A

  In the above-mentioned general-purpose electronic balance, if the weighing pan is exposed to the outside, the weighing pan shaft, which is inadvertently in contact with the side surface of the weighing pan during measurement, may be damaged by impact. In addition, there are problems such as dust that enters the scale body from the gap formed between the weighing pan and the back and the scale body, and dust inside the scale body has an adverse effect on the internal electronic equipment. was there.

  In addition, when using the above-mentioned protective cover for preventing dirt, it will be used in a semi-permanent state because it is adhered and fixed to the main body of the scale with double-sided tape. Therefore, when it was dirty and wanted to be replaced or when it was unnecessary, it was only torn and removed. The protective cover can be placed on the scale body and not fixed, but in that case, the protective cover may be misaligned, making it difficult to use, or when the protective cover touches the weighing pan or weighing pan shaft. The results could be affected.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic balance that prevents a shock from being inadvertently applied to a weighing pan and prevents dust from entering a weighing pan shaft.
It is another object of the present invention to provide an electronic balance that can be easily and surely fixed in a state where the protective cover is placed on the main body of the scale, and in which the protective cover can be removed later.

  In order to achieve the above object, the present invention takes the following technical means. That is, the present invention relates to an electronic balance / electronic scale equipped with a weighing pan, a cylindrical protective wall that is detachably attached to the balance body so as to surround the circumference of the weighing pan, and a transparent cover that is placed on the balance body. The protective cover is formed with a circular opening for exposing the weighing pan, and the peripheral edge of the opening is sandwiched between the lower end surface of the protective wall and the upper surface of the scale body so that the protective cover is It is fixed to the main body.

  In addition, it is preferable to make it as small as possible on the premise that the clearance gap between the said protective wall inner surface and a measurement dish surrounding side surface does not contact, For example, it is preferable to set it as about 0.5-2 mm. The height of the protective wall is preferably a dimension that sufficiently covers the peripheral side surface of the weighing pan, for example, about 1 cm to 2 cm. The protective cover is preferably made of a synthetic resin sheet material so as to cover the upper surface and the peripheral side surface of the scale body with the weighing pan exposed.

  In the electronic balance of the present invention configured as described above, since the periphery of the weighing pan is surrounded by a cylindrical protective wall, it is possible to prevent accidental contact with the peripheral side surface of the weighing pan. In addition, by making the gap between the inner surface of the protective wall and the side surface of the weighing pan as small as possible, it is possible to prevent the dust from entering the balance main body through the gap. Further, since the protective wall is detachably attached to the main body of the scale, when dust enters the bottom surface of the weighing pan, the protective wall can be removed and easily cleaned. Furthermore, the protective cover can be fixed by simply attaching the protective cover from the top of the protective cover around the weighing pan while the protective cover is placed on the scale body, and the protective cover can be fixed by removing the protective wall. Since it is released, there is an excellent effect that the protective cover can be removed easily when it is no longer needed, when the dirt is cleaned or replaced.

(Means and effects for solving other problems)
In the above invention, a plurality of engaging claws are provided at the lower end of the inner surface of the protective wall, and the engaging claws are configured to be detachably engaged with an engaged portion provided on the scale body side. Good.
Thereby, the engaging means can be formed with a simple structure, and the attachment / detachment operation of the protective wall by the engagement can be easily performed without using a fixture or a tool.

In the present invention, a windshield case may be formed above the weighing pan by connecting a transparent dome to the upper end of the protective wall.
Thereby, it is possible to cope with precise measurement in which the air flow influences, and it can be used for a wide range of measurement.

  Hereinafter, an electronic balance according to the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a perspective view of an electronic balance according to an embodiment of the present invention, and shows a state before a protective wall and a protective cover are attached. FIG. 2 shows a state in which the weighing pan, the protective wall, and the protective cover are removed from the electronic balance of FIG. FIG. 3 is a cross-sectional view showing a state in which the protective wall and the protective cover are attached to the main body of the scale.

  The scale body 1 includes a weight detection unit including a balance mechanism and the like, and includes a display unit 2 for displaying a measured weight value on the surface, and four legs 3 on the lower surface. A weighing pan 4 for placing an object to be measured is installed on the upper surface of the scale body 1 so as to be slightly exposed upward, and is coupled to an internal weight detection unit via a central shaft portion 5. Normally, the weighing pan 4 is connected only by being placed on the shaft portion 5 so that it can be removed.

  Furthermore, the scale main body 1 includes a cylindrical protective wall 6 disposed so as to surround the periphery of the weighing pan 4. This protective wall 6 is formed by sheet metal processing, and is detachably attached to the balance main body 1 via an engaging means. The engaging means includes a plurality of (preferably four) engaging claws 7 that are formed to protrude inward while being spaced from the lower end of the inner surface of the protective wall 6, and the engaging claws provided on the balance body side 1. 7 and an engaged portion 8 that is detachably engaged. The engaging claw 7 of the protective wall 6 is inserted through the incision portion 8a of the engaged portion 8 and is engaged by rotating the protective wall 6. The claw 7 is configured to fit under the engaged portion 8 to engage or disengage. The engaged portion 8 is formed on the outer peripheral edge of a disk 9 concentric with the shaft core 5 of the weighing pan 4, and the disk 9 is fixed to the balance body 1 with screws 10.

  The gap between the inner surface of the protective wall 6 and the peripheral side surface of the weighing pan 4 is as small as possible, for example, about 0.5 to 2 mm. The height of the protective wall 6 is preferably a dimension that can sufficiently cover the peripheral side surface of the weighing pan 4, for example, about 1 cm to 2 cm.

Furthermore, the electronic balance of the present invention includes a protective cover 11 made of a thin transparent synthetic resin that is detachably placed on the balance body 1. The protective cover 11 includes a circular opening 12 that exposes the weighing pan 4 portion. When the protective cover 11 is attached to the scale main body 1, the peripheral portion of the opening 12 is connected to the lower end surface of the protective wall 6 and the scale main body. The protective wall 6 is formed so as to be fixed to the main body 1 by being sandwiched between the upper surface of the balance 1. The protective cover 11 is formed in a state in which the weighing pan 4 is exposed and the upper surface and the peripheral side surface of the scale body 1 are covered.

  In addition, in the state of FIG. 1, when the protective cover 11 is unnecessary, only the protective wall 6 can be attached to the scale main body 1 and used. By attaching the protective wall 6, the circumference of the weighing pan 4 is surrounded by the cylindrical protective wall 6, so that it is possible to prevent accidental contact with the peripheral side surface of the weighing pan 4 and to apply dust. It is possible to prevent an object from entering the scale body 1. The protective wall 6 can be easily attached to the scale body 1 by a turning operation.

Further, when the protective cover 11 is attached to the scale body 1 and used, the edge portion of the opening 12 of the protective cover 11 is pressed down only by attaching the protective wall 6 after the protective cover 11 is placed on the scale body 1. The scale main body 1 can be fixed. In this case, as shown in FIG. 4, the opening edge portion can be stably pressed down by providing a step 6 a in which the opening edge portion of the protection cover 11 fits on the lower end surface of the protection wall 6. Further, since the protective cover 11 is released when the protective wall 6 is removed, the protective cover 11 can be easily removed when it is no longer needed, when dirt is cleaned, or when it is replaced.

  In the embodiment described above, the engaging claw 7 and the engaged portion 8 are engaged and disengaged by rotating the protective wall 6, but as shown in FIG. It is also possible to form the engaging claw 7 ′ so as to be elastically engaged with the engaged portion 8 ′ simply by pushing it down. In this case, in order to facilitate the elastic deformation of the engaging claw 7 ', it is preferable to provide a pair of left and right slits 13 extending vertically with the engaging claw 7' interposed therebetween as shown in FIG.

  Moreover, in this invention, as shown in FIG. 7, the transparent dome 14 can be connected with the upper end of the protective wall 6, and it can also be set as a windshield case. The transparent dome 14 may be formed by, for example, a transparent acrylic molded product (with a window). In this case, the transparent dome 14 is preferably detachable from the protective wall 6. As a result, the windshield case can be easily formed or removed as necessary.

  Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, and can be implemented with appropriate modifications within the scope of the present invention. .

  The present invention includes electronic balances equipped with an electromagnetic force balance mechanism, electronic balances such as load cell type, tuning fork type, and capacitance type, and all weighing devices that detect and measure the weight load of an object to be measured as an electrical signal. Available.

1 is a perspective view of an electronic balance according to the present invention, showing a state before a protective wall and a protective cover are attached. The perspective view which removed the weighing pan, the protective wall, and the protective cover of the said electronic balance. Sectional drawing which shows the state which attached the said protective wall and the protective cover to the balance main body. The expanded sectional view which shows the attachment state of a protective wall and a protective cover. The expanded sectional view which shows another Example of the engaging means in this invention. FIG. 6 is a partial side view of a protective wall in the embodiment shown in FIG. 5. Sectional drawing which shows another Example of this invention. The perspective view which shows the conventional electronic balance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scale main body 4 Weighing pan 5 Shaft part 6 Protection wall 7 Engagement claw 8 Engagement part 11 Protection cover 12 Opening part 14 Dome

Claims (5)

An electronic balance / electronic scale equipped with a weighing pan,
A cylindrical protective wall removably attached to the main body of the scale so as to surround the weighing pan,
A transparent protective cover for covering the main body of the scale, and the protective cover is formed with a circular opening for exposing the weighing pan, and the periphery of the opening is sandwiched between the lower end surface of the protective wall and the upper surface of the main body of the scale. Electronic balance / electronic scale, characterized in that the protective cover is fixed to the scale body. A plurality of engaging claws are provided at the lower end of the inner surface of the protective wall, and the engaging claws are configured to be detachably engaged with an engaged portion provided on the scale body side. Electronic balance / electronic scale as described. The electronic balance / electronic balance according to claim 1 or 2, wherein the engaging claw and the engaged portion are configured to be engaged and disengaged by rotating the protective wall. The electronic device according to any one of claims 1 to 3, wherein the protective cover is formed of a synthetic resin sheet material and is formed so as to cover an upper surface and a peripheral side surface of the scale body with the weighing pan exposed. Balance / electronic scale. The electronic balance / electronic balance according to any one of claims 1 to 4, wherein a transparent dome is connected to an upper end of the protective wall to form a windshield case above the weighing pan.

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