JP3857153B2 - Load sensor mounting bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load sensor mounting bracket for fixing a load sensor having a tuning fork vibrator used in an electronic scale or the like.
[0002]
[Prior art]
In electronic scales, a tuning fork vibrator manufactured by processing a metal block as a load sensor may be used. As shown in FIG. 3, a load sensor 1 made of a metal plate by wire cutting or the like includes a tuning fork vibrator 2 in a part thereof, and applies a load applied to the load point 3 via a lever 4 and a fulcrum 5 to a tuning fork. The load is measured by the frequency transmitted to the vibrator 2 and oscillated by the tuning fork vibrator 2. The load sensor 1 is fixed to the bolt hole 7 of the base 6 with bolts 8 at a plurality of positions directly or via intervening members. However, the load sensor 1 having a tuning fork vibrator is generally made of a special metal, and the base 6 is made of aluminum die cast or iron.
[0003]
[Problems to be solved by the invention]
If the load sensor 1 and the base 6 are the same type of metal, there will be almost no trouble due to thermal deformation even if the temperature changes in the usage environment. Stress may be applied to the load sensor 1 through the bolt 8 due to different thermal expansion, which may affect the transmission frequency of the tuning fork vibrator 2 and may cause unstable measurement accuracy.
[0004]
An object of the present invention is to solve the above-mentioned problems and to provide a load sensor mounting bracket in which no stress is applied to the load sensor even if a temperature change occurs and a thermal expansion difference occurs.
[0005]
[Means for Solving the Problems]
Load sensor mounting bracket according to the present invention for achieving the above object, in a case of fixing the load sensor made of a metal having a tuning fork vibrator thermal expansion coefficient different from the metal base of the heterologous at two locations, the Via a metal deformation absorbing member having a pedestal for fixing the load sensor at the two locations and having a portion that absorbs stress that deforms against stress due to thermal deformation and changes the interval between the two locations of the pedestal. A load sensor is fixed to the base.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the illustrated embodiment.
FIG. 1 is a perspective view of a state in which a load sensor 13 having a tuning fork vibrator 13a is fixed to a base 11 made of aluminum die cast according to a first embodiment via a mounting bracket 12. FIG.
[0007]
The mounting bracket 12 is made of aluminum die-casting, and includes a base 12b having two holes 12a for inserting bolts for fixing to the base 11, and two arms 12c each protruding forward from the base 12b. -12f, and connecting portions 12g and 12h are provided for each pair of these arms 12c to 12f, that is, the ends of the arms 12c and 12d and the arms 12e and 12f are connected to each other. The bases 12i and 12j for fixing the load sensor 13 are respectively provided. And the screw holes 12k and 12l for screwing the load sensor 13 are formed in the bases 12i and 12j toward the longitudinal direction of the arms 12c to 12f.
[0008]
The two bolts 14 are respectively inserted into the two holes 13b of the load sensor 13 and screwed into the screw holes 12i and 12j of the bases 12j and 12k of the mounting bracket 12 to fix the load sensor 13 to the mounting bracket 12. To do. Then, the mounting bracket 12 is fixed to the screw hole 11a of the base 11 by using two bolts 15 inserted through the hole 12a of the base 12b.
[0009]
Here, even if the temperature changes in the use environment and the mounting interval between the two screw holes 11a of the base 11 changes, the arms 12c to 12f of the mounting bracket 12 are deformed by bending or the like. The thermal deformation of the table 11 is absorbed, and the stress due to the thermal change is not transmitted to the load sensor 13, and the performance of the tuning fork vibrator 13a is not affected.
[0010]
In the second embodiment shown in FIG. 2, the mounting bracket 21 made of a steel plate is formed by pressing. In the mounting bracket 21, the metal strip 21a is bent in a substantially U shape, and two tongue pieces 21c, 21e are provided inwardly from the opposing upper and lower sides 21b, 21c, and these tongue pieces 21c. 21e are provided with holes 21f for fixing to the base 11 via bolts. Bases 21i and 21j projecting bolts 21h for fixing the load sensor 13 are respectively caulked and stopped at the connecting part 21g connecting the side parts 21b and 21c.
[0011]
In the mounting bracket 21 of the second embodiment, the two holes 13b of the load sensor 13 are inserted into bolts 21h and fixed by nuts, and the mounting bracket 21 is fixed to the base 11 through the holes 21f. It fixes to the screw hole 11a using a volt | bolt.
[0012]
As a result, even if the temperature changes and the distance between the two screw holes 11a of the base 11 changes, the side portions 21b and 21c of the mounting bracket 21 are deformed to absorb the deformation, and the load sensor 13 is heated. Stress due to deformation is not transmitted.
[0013]
Even if the mounting bracket is provided integrally with the base 11, the same function can be obtained.
[0014]
【The invention's effect】
As described above, the load sensor mounting bracket according to the present invention absorbs the thermal expansion difference generated between the load sensor and the base due to a temperature change by the deformation absorbing member. Is less likely to be transmitted and the influence on the measurement accuracy of the tuning fork vibrator is reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a state in which a load sensor is attached to a base via a mounting bracket according to a first embodiment.
FIG. 2 is a perspective view of a mounting bracket according to a second embodiment.
FIG. 3 is a perspective view of a conventional example in which a load sensor is fixed to a base.
[Explanation of symbols]
11 Base 12, 21 Mounting bracket 12 c to 12 f Arm 13 Load sensor 13 a Tuning fork vibrator 13 b Hole 21 b, 21 c Side

Claims (2)

In a case where a metal load sensor having a tuning fork vibrator is fixed to two different metal bases having different coefficients of thermal expansion at two locations, the load sensor has a pedestal for fixing the load sensor at the two locations, and stress due to thermal deformation. The load sensor is fixed to the base through a metal deformation absorbing member having a portion that absorbs stress that is deformed relative to the base and changes the distance between the two positions of the base. Hardware. The load sensor mounting bracket according to claim 1 , wherein the deformation absorbing member is made of the same material as the base.

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