JPS5813322Y2 - load cell - Google Patents

Description

[Detailed description of the invention] This invention is an improved load cell that generates a corresponding electrical signal when it receives an external force acting in a certain direction, so that changes in ambient temperature will not affect the detected value. It is intended to provide a load cell.

An embodiment of this invention will be described with reference to the drawings.

The lever indicated by reference numeral 1 in the figure is rotatably supported by the support of the diaphragm 2 at its axial center, so that when an external force F in a certain direction is applied to one end,
Centered around the fulcrum defined by diaphragm 2,
Generates a rotational force that is transmitted as a corner to the other end.

This rotational force is detected by a sensor 3 installed between one end of the lever 1 and a suitable base, and the rotational force (
In other words, it is taken out as an electrical signal corresponding to the external force F).

Further, in order to limit the direction of rotation of the lever 1 only within the above-mentioned effective rotation plane, a leaf spring 5 is provided to elastically connect the base body 4 and the lever 1.

This leaf spring 5 is perpendicular to the above-mentioned plane of rotation, and preferably
In other words, a pair of first portions 5a are provided at positions facing each other across the lever 1 so as to extend along a plane that substantially coincides with the axis of the lever 1; a U-shaped second portion 5 extending along a vertical plane;
b, and one end of the first portion 5a is fixed to the base body 4.

One end of the second portion 5b is integrally connected to one end of each of the first portions 5a, and the other end is fixed to the tip of the lever 1.

Even if there is a difference in expansion and contraction between the lever 1 and the leaf spring 5 due to differences in the materials used in the load cell constructed in this way, or due to differences in heat capacity even if they are made of the same material, Since this difference is almost completely absorbed by the change in the distance between the free ends of the second portion 5b, no large reaction force acts between them.

If a force couple is generated due to this stress, this will impart a rotational moment to the lever 1, which will apparently increase or decrease the output output from the sensor 3.

In other words, the load cell of this invention is hardly affected by errors caused by this couple and can maintain high accuracy over a wide temperature range.

[Brief explanation of the drawing]

The drawing is a perspective view showing a row according to an embodiment of the invention. 1... Lever, 2... Diaphragm, 3... Sensor 4... Base, 5... Leaf spring, 5a... First part, 5b... Second part.

Claims (1)

[Scope of utility model registration request] A lever rotatably supported so that the other end is displaced about a predetermined fulcrum when an external force is applied to one end, and a sensor for converting the rotational force of the lever into a corresponding electric signal. and a leaf spring for restricting the rotational direction of the lever within a predetermined rotational plane, the leaf springs being located at positions facing each other across the lever, and with respect to the rotational plane. a pair of first portions extending along planes perpendicular to each other; and a U-shape extending along a plane substantially perpendicular to the axis of the lever, one end of which is continuous with the first portion, and the other end of the lever. and a second portion fixed to the lever.