JP2592123Y2 - Weighing pan with instantaneous load absorption mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing pan of a weighing apparatus, and more particularly to a weighing pan having a mechanism for absorbing a large instantaneous load.

[0002]

2. Description of the Related Art In a weighing device having high measurement accuracy, such as an electromagnetic balance type weighing device and a weighing device using a load cell, a mechanism for transmitting a load or measuring a load in order to maintain a high accuracy. Since it is configured to operate even in a small amount, it tends to be fragile. For this reason, a stopper is provided at any part of the load transmitting mechanism, so that even if a large load exceeding a specified value is applied, the load is not transmitted to the load measuring mechanism side to protect the mechanism.

However, when an instantaneous large load is impulsively applied by dropping a weighed object or the like, almost all of the large load is transmitted to the load measuring mechanism before the stopper is operated. As a result, These mechanisms may be damaged.
For this reason, a mechanism has been proposed which absorbs even a large load applied momentarily. These momentary large load absorbing mechanisms are basically characterized in that the applied load is instantaneously absorbed by elastic deformation of an elastic body such as a spring material. The instantaneous large load absorbing mechanism is sometimes incorporated in the load transmission mechanism or the weighing mechanism inside the weighing device main body.However, in order to avoid the complexity of the internal mechanism, it is incorporated in the weighing pan where the weighing object is placed. It is often done.

[0004]

FIG. 4 is a partial rear view of a weighing dish having an instantaneous large-load absorbing mechanism previously proposed by the present applicant (Japanese Utility Model Publication No. 3-13704). In this weighing dish, a leaf spring 53 is used as an elastic body.
3 is interposed between the weighing dish 51 and the load transmission mechanism of the weighing device, so that a large load is instantaneously applied to the weighing dish 51 by dropping the weighing object onto the weighing dish 51 or the like. The leaf spring 53 is instantaneously elastically deformed, and most of the applied large load is absorbed by the leaf spring 53, and the mechanism in the weighing device is effectively protected from the large load.

[0005] Here, the plate spring 53 has an annular peripheral portion 53a as shown, an arm-shaped portion 5 3b of the three that are out inward exhibition from the peripheral edge 53a, and FIG. Although it is not clear from FIG.
The entire leaf spring 53 is formed in a substantially funnel shape by being bent so as to protrude from the virtual plane where 3a is located.
ing. Thus, the load is mainly absorbed by the elastic deformation of the arm 53b. That is, in forming the leaf spring 53, it is necessary to form the spring material into a complicated shape as shown in the figure and to bend a predetermined portion to form the spring material, which increases the manufacturing cost. Further, it is necessary to change the spring constant of the leaf spring depending on the maximum weighing of the weighing device and the difference in the strength of the internal mechanism. In this case, it is necessary to separately form a leaf spring 53 suitable for each.

Some weighing dishes having an instantaneous large load absorbing mechanism have been proposed in addition to the conventional structure shown in the drawings. There is a common problem that it is a leaf spring, has a complicated shape, and is a special mechanism that can be used only for a specific device.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a weighing dish main body on which a weighing object to be measured is placed, and a weighing dish main body. One or more coil springs are arranged between the supporting pan receiver,
A weighing dish of a weighing device, wherein a coil spring positioning means is formed on at least one of the weighing dish main body and the dish receiver so that the coil spring is arranged at a predetermined position.

[0008]

Normally, the load of the weighing object placed on the weighing pan is transmitted to the internal mechanism of the weighing device from the weighing pan via a coil spring via the pan receiver, and the load of the weighing substance is measured. If a large load is momentarily applied to the weighing dish, such as by accidentally dropping the weighed object onto the weighing dish, the coil spring is elastically deformed due to the instantaneous large load, and almost all of the large load is changed by the coil spring. And the internal mechanism of the weighing device is effectively protected from momentary heavy loads.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. The arrow 1 in the figure indicates a weighing dish, which is configured to be used in, for example, an electromagnetic balance type weighing device or a load cell type weighing device. The weighing dish 1 includes a weighing dish main body 2 on which a weighing object is directly placed, and a pan receiver 3 that supports the weighing dish main body 2.

First, a boss-shaped connecting portion 4 is protruded from the center of the back surface 3a of the tray receiver 3 so that a shaft 5 of a load transmitting mechanism, which is an internal mechanism of the weighing device, is inserted through the connecting portion 4. It has become. On the other hand, the boss 6
Are protrudingly formed as positioning means for arranging and fixing the coil spring at a predetermined position. As shown in FIG. 1, these bosses 6 are formed on the tray receiving surface 3b so as to be located at equal intervals on an imaginary circle coaxial with the tray receiving 3, respectively. In the illustrated configuration, three bosses 6 are formed at equal intervals so as to be located on the virtual circle. Next, reference numeral 7 denotes a boss (hereinafter, referred to as a "center boss") serving as a coil spring arranging means formed in the same manner as the boss 6, and is provided at the center of the Projection is formed on the receiving surface 3b.

A coil spring 8 is disposed on each of the bosses 6 and 7 formed at a total of four places in the tray 3. The coil spring 8 itself is not specially modified, and may be a commercially available coil spring. However, an appropriate spring constant may be determined in advance by protecting the internal mechanism of the weighing device to which the weighing dish 1 is attached or by maximizing weighing. Are selected and used.

The weighing dish main body 2 is attached to the dish receiver 3 via these coil springs 8. Mainly in FIG. 1, a plurality of notches 3 c (4 in the illustrated case)
Places) are formed. The notch 3 c is completely cut out along the thickness direction of the pan receiver 3. Reference numeral 3d denotes a step formed adjacent to the notch 3c, and its planar shape is substantially the same as the notch 3c, but is different from the notch 3c in the thickness direction of the pan receiver 3. Are not completely cut away, but are formed so as to be recessed with respect to the dish receiving back surface 3a. Each notch 3c and each step 3d adjacent to the notch 3c are arranged at the same distance from each other. On the other hand, at the lower side edge of the weighing dish main body 2, the notch 3c
And locking piece 2a having substantially the same planar shape as step 3d
Are bent toward the center of the weighing dish main body.

The weighing dish main body 2 and the dish receiver 3 having the above-mentioned structure are integrated by the following procedure. First, each boss 6 and 7 of the pan receiver 3
Are provided with predetermined coil springs 8, respectively. In this state, the weighing dish main body 2 is arranged so as to cover the dish receiver 3. In this case, each locking piece 2a of the weighing pan main body 2 has a notch 3c of the pan receiver 3.
The weighing dish main body 2 is pushed into the pan receiver 3 side in this state. Thereby, the weighing dish main body 2
Lowers against the resilient force of each coil spring 8, and each locking piece 2
a once protrudes to the back side 3a of the dish via the notch 3c of the dish 3. In this state, the weighing dish main body 2 is rotated so that each locking piece 2a is positioned at the adjacent step 3d, and the pressed state of the weighing dish main body 2 is released. As a result, each locking piece 2a of the weighing dish main body 2 is locked to each step 3d of the weighing dish main body 3 by the elastic force of the internal coil spring 8, so that the weighing dish main body 2 and the weighing dish main body 3 are separated. Be integrated.

When the weighing dish 1 having the above structure is mounted on the weighing device, almost all of the instantaneous large load applied to the weighing dish 1 is absorbed by the elastic deformation of the coil spring 8. Note that the weighing dish main body 2 and the dish receiver 3 can be easily separated by performing the above procedure in reverse. For this reason, the replacement of the internal coil spring 8 is extremely easy. For example, the weighing dish main body 2 and the dish receiver 3 have exactly the same configuration, and only the coil springs 8 having different spring constants are used. Can be used for many types of weighing devices.

A large number of positioning means are formed in advance, and the number of coil springs 8 is adjusted without changing the spring constant so that the coil springs 8 can be used for different types of weighing devices. By changing the number of the coil springs 8 and changing the number of the coil springs 8, it is possible to cope with many weighing devices.

In the arrangements shown in FIGS. 1 and 2, four coil springs 8 are arranged for convenience. For example, the peripheral boss 6 is completely eliminated and only the center boss 7 is provided. A configuration in which a coil spring is disposed or a configuration in which a coil spring is disposed only on the boss 6 on an imaginary circle by abolishing the central coil spring are also possible.
Also, as described above, the number of coil springs arranged on the virtual circle need not be limited to three. Further, since the coil spring only needs to be arranged and fixed at a predetermined position set in advance, it does not matter what the positioning means is. Further, this positioning means may be formed on the weighing dish main body 2 side, or the positioning means on the pan receiver 3 side may be omitted and formed only on the weighing dish main body 2 side.

FIG. 3 shows another means for positioning the coil spring. A cylindrical projection 3e having an outer shape substantially equal to the inner diameter of the coil spring 8 is projected from the surface 3b of the dish receiver 3, and this projection is provided. The respective coil springs 8 are arranged with respect to the portion 3e. Depending on the thickness of the outer dish receiver 3, instead of the bosses 6 and 7, it is also possible to form a recess having an inner diameter substantially equal to the outer shape of the coil spring 8 on the dish receiving surface 3b to serve as positioning means. is there.

[0019]

According to the present invention, as specifically described in the above embodiment, the elastic body that absorbs the instantaneous load is a general coil spring that is commercially available, so that it has a special structure such as the prior art. It is not necessary to use a leaf spring having a shape, and by selecting coil springs with different spring constants, it is possible to use the same weighing dish itself to support weighing devices of different weighing, which is extremely economical. .

Further, the coil spring need only be disposed on the positioning means formed in advance, and there is no need for mounting work such as caulking or fine adjustment of the elastic body after mounting, and assembly is easy and requires skill. And not.

[Brief description of the drawings]

FIG. 1 is a rear view of a weighing dish according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged partial cross-sectional view of a weighing dish main body and a dish receiver showing another configuration example of the coil spring positioning means.

FIG. 4 is a partial rear view of a weighing dish having a load absorbing mechanism prior to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weighing dish 2 Weighing dish main body 2a Locking piece 3 Dish receiver 3a Dish receiving back surface 3b Dish receiving surface 3c Notch 3d Step 3e Convex part (coil spring positioning means) 6 Boss (coil spring positioning means) 7 Central boss (coil) Spring positioning means) 8 Coil spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A and weighing pan body weighed materials are placed, this
A weighing pan body supporting the weighing pan main body;
The coil spring is positioned between
In the weighing dish which is interposed and arranged to absorb the instantaneous load by the elastic deformation of the coil spring, a plurality of locking pieces are provided on the lower side edge of the weighing dish main body so as to project toward the center of the weighing dish main body. dish receiving side at the edge this locking piece is a notch formed allows to move the dish incarnation thickness direction, Katsuko
It stepped portions adjacent the notch is formed on the dish受裏surface, before
The engaging piece are integrated is engaged with weighing pan body and pan supporter with the stepped portion, and moves the locking piece to the dish incarnation thickness direction through the notch by the elastic force of the serial coil spring A weighing dish having an instantaneous load absorbing mechanism, wherein the weighing dish main body and the dish receiver are separated from each other.