JP2874609B2 - electronic balance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic balance, and more particularly to an electronic balance with improved switch operability.

[0002]

2. Description of the Related Art A conventional electronic balance having a base and a case mounted on the base and containing a switch therein has heretofore been known as a switch device thereof as follows.

One of them is to mount a switch on a switch board separated from a control board of an electronic balance, fix the switch board to a case, and arrange the switch head and the surface of the case on the same plane. A sheet panel on which a switch portion is printed and displayed is attached on the switch so as to cover the head of the switch, and a switch board is cord-connected to the control board. In this switch operating device,
By pressing and releasing the sheet panel with a finger, the open / close state of the switch is switched, and the electronic balance is controlled.

[0004] The other is one in which a switch is mounted on a control board fixed to a base, and a sheet panel or a push button is provided in a case. Of these, in those using a sheet panel, a spacer is interposed to fill a relatively wide gap between the sheet panel and the head of the switch,
In the case of using a push button, the push button is lengthened. Also in this switch operating device, the electronic balance is controlled by switching the open / close state of the switch by pushing or releasing the sheet panel or the push button of the case with a finger.

[0005]

However, in the former case in which a switch is mounted on a switch board separated from the control board, the switch board is cord-connected to the control board, so that the connection cord is in the way of the base. The case cannot be easily attached and detached. On the other hand, in the latter case where the switch is mounted directly on the control board, when the switch is operated, excessive force is easily applied to the spacer that fills the gap between the switch head and the seat panel, so the switch operation is smooth. May damage the spacers or break the spacers and switches, and it may take time to position the spacer in the proper position between the seat panel and the head of the spacer or to dimension the spacer. However, there was an inconvenience at the time of assembling.

The present invention has been made in view of the above circumstances, and a switch is mounted directly on a control board of an electronic balance, thereby eliminating the need to separately provide a switch board. An electronic balance equipped with a switch device that ensures operability, at the same time eliminates the risk of breaking the switch, and that, when the case is attached to the base, the push button is naturally located at an appropriate position with respect to the switch head. The purpose is to provide.

[0007]

That is, in order to solve the above-mentioned problems, the present invention has a base and a case mounted on the base, and a switch is mounted on an electronic balance in which a switch is housed. The control board is fixed to the base, and the control board is sandwiched in the vicinity of the switch mounting portion by the bosses provided on each of the base and the case mounted on the base. The operation lever is connected with a fastener such as a set screw inserted into the control board, and is provided in a part of the case in a hollow shape and has an elastic base integrally connected to the case. The switch is provided with a push button for contacting the head of the switch.

When the electronic balance is used as the above means, the base and the case are aligned with each other via the boss on the base side and the boss on the case side which are connected by a fastener such as a set screw, and the positions are adjusted as described above. Since the push button of the operation lever provided integrally with the case is in contact with the switch head, mounting the case on the base allows the push button to be naturally located at an appropriate position with respect to the switch head. become. Further, since the switch is directly mounted on the control board fixed to the base, it is not necessary to separately provide a switch board. Further, since the push button is provided on the operation lever provided in a part of the case in a hollow shape, it is not necessary to separately provide the push button.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing a part of an electronic balance provided with a switch device according to an embodiment of the present invention, and FIG. FIG. 3 is a partial sectional view showing another part of the electronic balance.

The electronic balance of the present invention includes a base 1 and a case 2 mounted on the base 1, and a measuring dish 4 is provided on a balance mechanism housing 3 at the rear.

The base 1 has bosses 1 at a plurality of front portions.
The bosses 1 and 12 are provided by integral molding.
A screw hole 13 and a set screw insertion hole 14 are formed in 1 and 12, respectively. The control board 5 is superposed on the bosses 11 and 12, and the control board 5 is fixed to the base 1 by a set screw 15 inserted into the control board 5 and fastened to the rear boss 11. ing. Switches 6 are mounted at a plurality of locations on the control board 5.

The case 2 has bosses 21 integrally formed at a plurality of locations on the front rear surface thereof. The boss 21 has a screw hole 22 formed therein. The operation lever 7 is formed in a hollow shape at a plurality of places at the front part of the case 2. As shown in FIGS. 1 and 3, the operation lever 7 has a thick push button 72 integrally at the tip, and a narrow and thin base 71 is integrally connected to the case 2. I have.
The base 71 has elasticity.

Here, when the boss 21 of the case 2 is aligned with the boss 12 at the front part of the base 1, the closed case 2 is properly aligned with respect to the base 1, When the case 2 is properly positioned on the control board 1 and the boss 21 on the case 2 overlaps the control board 5, the push buttons 72 of the operating levers 7.
Are brought into contact with the heads 61 of the plurality of switches 6 mounted on the control board 5 in an appropriate state. Therefore, as shown in FIG.
The second set screw 8 through the set screw insertion hole 14 and the insertion hole 51 formed in the control board 5 is screwed into the screw hole 22 of the boss 21 of the case 2 overlapping the control board 5 and tightened. In this case, the case 2 is properly aligned and mounted on the base 1, and the push buttons 72 of the operation levers 7 are individually provided on the heads 61 of the respective switches 6 as shown in FIG. And are brought into contact with each other.

In this switch device, FIG.
As shown in FIG. 2, the control board 5 includes a plurality of switches 6.
The boss 12 of the base 1 and the boss 21 of the case 2 are sandwiched in the vicinity of the mounting position, and the control board 5 is always in close contact with the boss 21 on the case 2 side. The distance between the switches 6
The installation state of is stable. Therefore, the variation in the feeling when the push button 72 is pressed is reduced, and the operability of the switch is kept good. This effect is also exhibited when a switch having a short operation stroke is used.

In the embodiment described above, the boss 12 on the base 1 side and the boss 21 on the case 2 side are connected by the set screw 8 inserted through the control board 5.
It is also possible to use other fasteners for the means for joining 2, 21.

[0016]

As described above in detail, according to the electronic balance of the present invention, by attaching the case to the base, the push button is naturally arranged at an appropriate position with respect to the switch head, and the switch is mounted on the switch head. Because of the contact, there is no need to adjust the position of the push button to the switch head during assembly, and at the same time, after assembly, smooth switch operability is ensured and the switch is broken when operating. Or the risk of being greatly reduced as compared with the related art. Since the control board is sandwiched between the boss on the base side and the boss on the case side in the vicinity of the switch mounting position and is in close contact with the boss on the case 2 side, the distance between the control board and the case is always accurate. At the same time it is kept, the installation state of the switch is stable even when the push button is pushed in,
This helps to prevent variations in feel during switch operation and maintain good switch operability.

In addition, since there is no need to separately provide a switch board, the structure can be simplified and the cost can be reduced. Further, a cord for connecting the switch board to the control board is not required, and the case can be easily attached to and detached from the base ( (Opening / closing), and since the push button is provided on a lever provided in a part of the case in a hollow shape, there is an advantage that it is not necessary to separately provide a push button.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of an electronic balance provided with a switch device according to an embodiment of the present invention.

FIG. 2 is a side view in which a part of the electronic balance is cut away.

FIG. 3 is a partial sectional view showing another part of the electronic balance.

[Explanation of symbols]

 Reference Signs List 1 base 2 case 5 control board 6 switch 7 operating lever 8 set screw 12, 21 boss 61 switch head 71 operating lever base 72 push button

────────────────────────────────────────────────── ─── Continuation of the front page (72) Koji Tomoda, Inventor Kojiwara-cho, Nishinokyo, Nakagyo-ku, Kyoto-shi In the Sanjo Plant of Shimadzu Corporation (56) References Japanese Utility Model 6-33329 (JP, U) Japanese Utility Model Sho 59- 135433 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01G 23/00

Claims (1)

(57) [Claims] An electronic balance having a base and a case mounted on the base, and a switch housed therein, wherein a control board on which the switch is mounted is fixed to the base, and the base and the base are mounted on the base. The control board is sandwiched in the vicinity of the switch mounting portion by bosses provided on each of the cases and the bosses, and these bosses are connected by fasteners such as set screws inserted into the control board. An operating lever provided in a part of the case in a hollow shape and having an elastic base integrally connected to the case is provided with a push button that is in contact with the head of the switch. Electronic balance.