JPS637875Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an overload prevention device for load cell scales, which reliably protects load cells from vertical overloads and lateral overloads, and which can also simplify the structure. The purpose of this is to provide an overload prevention device.

In this idea, a stopper extending downward is provided on the frame connected to the load receiver of the load cell, and the load on the mounting pan is transmitted from the frame to the load cell to measure the load. The load cell is supported by the contact between the stopper and the base, and the base is provided with a peripheral wall that surrounds the stopper, and the lateral load is supported by the contact between the stopper and the peripheral wall.Therefore, the load cell is protected from vertical and lateral overload. By simply providing the base with a peripheral wall that protects the stopper and surrounds the stopper that contacts the base, lateral overload can be prevented, so the number of parts is reduced and the structure can be simplified. .

A first embodiment of this invention will be explained based on FIGS. 1 to 4. Reference numeral 1 denotes a main body case, and a mounting plate 2 on which an object to be surveyed is placed is provided on the upper surface of the main body case 1. A fixed part 5 of a load cell 4 is fixed to a base 3 installed on the lower surface of the main body case 1, and a center part of a frame 7 assembled in a cross shape when viewed from the top is connected to a load receiving part 6 on the opposite side. A bearing 9 is provided on the frame 7 to project from the upper surface of the main body case 1 and support a cylindrical portion 8 fixed to the lower surface of the mounting plate 2 in a fitted state.
A stopper 11 made of a screw having a contact portion 10 for contacting the base 3 at its lower end is screwed onto one end of the frame 7 so as to be prevented from rotating by a nut 12 and to be vertically adjustable. A metal fitting 13 is screwed to the base 3, and the metal fitting 13 has a peripheral wall 14 formed of a hole that surrounds the stopper 11 with a slight gap. Further, the load cell 4 is provided at the other end of the frame 7.
A stopper 15 formed by a bolt facing the upper surface of the fixing portion 5 is screwed together with a nut 16 so as to be prevented from rotating and can be vertically adjusted.

In such a configuration, the load on the mounting plate 2 is transmitted from the frame 7 to the load cell 4, and the mechanical load is converted into an electrical signal to measure the weight. Platter 2
If the load on the stopper 11 is too large, the contact portion 10 of the stopper 11 will contact the base 3, or the stopper 15
The lower surface of the load cell 4 comes into contact with the upper surface of the fixed part 5, so that the overload from above is applied to the load receiving part 6.
This prevents the load cell 4 from being excessively deformed.

In addition, a lateral load may be applied to the tray 2 and the frame 7 during transportation, and if the load is large, the stopper 11 and the peripheral wall 14 come into contact to protect the load cell 4 from lateral overload.

In this way, the peripheral wall 14 that surrounds the stopper 11 that comes into contact with the base 3 and prevents an overload in the vertical direction.
Since it is possible to prevent lateral overload by simply forming the lateral structure, the number of parts is small and the lateral construction can be extremely simplified.

Next, a second embodiment of this invention will be explained based on FIGS. 5 and 6. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, a small diameter part 17 protrudes from the contact part 10 of the stopper 11, and a peripheral wall 18 that comes into contact with the small diameter part 17 is formed on the base 3 to protect the load cell from lateral overload.
However, the peripheral wall 18 is formed by directly forming holes in the base 3, thereby further simplifying the structure. Other operations are similar to those in the previous embodiment.

This idea protects the load cell from overload on the mounting plate by providing a stopper that comes into contact with the base on the frame that supports the mounting plate as described above. The load cell can be protected from lateral overload by providing the same stopper on the base and the surrounding wall, and the load cell can be protected from vertical and lateral overload by simply bringing the same stopper into contact with the base and the surrounding wall. This has the advantage of reducing the number of parts and simplifying horizontal construction.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the first embodiment of this invention, showing the overall configuration in a reduced size; FIG. 2 is a perspective view showing the relationship between the main body case and the tray in a reduced size;
Fig. 3 is a perspective view showing the internal mechanism of the main body case, Fig. 4 is a side view of the internal mechanism partially cut away, and Fig. 5 is a side view of the internal mechanism showing a second embodiment of this invention. The perspective view and FIG. 6 are side views of the internal mechanism, partially cut away. 2... Placing plate, 3... Base, 4... Load cell, 6... Load receiver, 7... Frame, 10...
Contact portion, 11... Stopper, 14, 18... Peripheral wall.

Claims (1)

[Scope of utility model registration request] A frame supporting the plate is connected to a load receiving part of a load cell supported by a base, and a stopper is provided on this frame and has a contact part that extends downward and faces the base with a predetermined gap, and the base An overload prevention device for a load cell weighing device, comprising: a peripheral wall surrounding the stopper with a predetermined gap therebetween.