JPS6210663Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a load cell used in an electronic scale.

Generally, a load cell used in an electronic scale has a flat bottom plate 1 and a cell body support part 2 vertically disposed on the side edge of the bottom plate 1, as shown in FIGS. 1 and 2. The cell bracket 3 consists of a cell bracket 3, and a cell body 4 to which a strain gauge is attached. Then, one side of the cell main body 4 is brought into contact with the cell main body support part 2 of the cell bracket 3, and both are fixed with bolts 5. At the same time, a weighing pan (Fig. (not shown). When the object to be weighed is placed on the weighing pan, the strain produced in the cell body is detected by a strain gauge, thereby measuring the weight of the object.

By the way, it is desirable to keep the height of the load cell as described above as low as possible. This is because if the height of the load cell is kept low, the height of the weighing section of a weighing machine using the load cell can be kept low, making weighing operations easier. Furthermore, even if the weighing machine is buried in a cash register counter in a supermarket, the lower the height of the load cell, the easier the installation work will be.

Therefore, in order to keep the height of the load cell low, it has been considered to omit the bottom base plate 1 of the cell bracket 3.

However, conventional load cells are
As shown in the figure, the bottom base plate 1 of the cell bracket 3
A stopper 8 for regulating the amount of downward movement of the cell body 4 and a stopper 9 for regulating the amount of upward movement of the cell body 4 are formed at the portion. When a load of more than a predetermined amount is applied to the cell body 4 and the cell body 4 attempts to move upward or downward by more than a predetermined amount, the pan support bracket 6 fixed to the cell body 4 and the bottom part 6a or protrude sideways. The locking piece 6b provided
However, by contacting the stopper 8 or 9, the cell body 4 is prevented from moving beyond a predetermined amount. For this reason, the bottom base plate 1 of the cell bracket 3 could not be omitted.

In view of the above-mentioned conventional drawbacks, the present invention has been developed by combining the inner circumferential surface of an oval-shaped through hole drilled in the cell body and the outer circumferential surface of a limit pin whose one end is fixed to the cell bracket when inserted into the through hole. Therefore, by regulating the amount of upward and downward movement of the cell main body, the bottom base plate of the cell bracket is omitted and the height of the entire load cell is reduced. The details of the present invention will be explained below with reference to the embodiments shown in the drawings.

3 and 4 are a plan view and a side view showing the load cell according to the present invention.
0 is a cell bracket that supports a cell main body 24 and a limit pin 31, which will be described later. This cell bracket 20 is placed and fixed on a base (not shown) of the scale case, and as shown in FIGS. 5 to 7, it includes a cell body support part 21 for supporting a cell body 24 to be described later, When the cell body 24 is attached to the cell body support part 21, it consists of a side wall part 22 formed so as to be located on the side of the cell body 24. A mounting hole 23 for fixing a limit pin 31 to the side wall 22, which will be described later, is provided at the end of the side wall 22. 24 is a cell body to which a strain gauge is attached, and as shown in Fig. 8, both ends of a vertically parallel beam A are vertically connected to each other at a predetermined interval, and one connected end is a fixed end. The other connecting end is a swinging end C that swings up and down. To attach the cell body to the cell bracket 20, the fixed end portion B of the cell body 24 is attached to the cell bracket 20.
This is done by bringing the cell body support portion 21 into contact with the cell body support portion 21 and fixing both of them with bolts 25.
Then, this cell body 24 is attached to the cell bracket 20.
When fixed to the side wall portion 22 of the cell bracket 20
At a position facing the mounting hole 23 formed in the
As shown in the figure, an oblong through hole 26 is bored. 27 is an end plate 27 attached to the cell body 24.
This is a pan plate bracket bolted via a. This plate holder bracket 27 is shown in FIGS. 9 and 1.
As shown in Fig. 0, the bracket body 28 is made up of a U-shaped bracket body 28 and a plate holder 29 fixed to the upper surface of the bracket body 28. Through hole 26
A larger diameter opening 30 is provided. 31 is a mounting hole 2 provided at one end in the side wall of the cell bracket 20.
3 is a limit pin that is inserted into a through hole 26 drilled in the cell body 24 when bolted to the cell body 24,
This limit pin 31 is provided with a screw hole 32 for bolting the limit pin 31 to the mounting hole 23, as shown in FIG. Also, this limit pin 3
The diameters of the limit pin 31 and the through hole 26 are adjusted so that a predetermined amount of clearance l is formed between the outer circumferential surface of the limit pin 31 and the inner circumferential surface of the through hole 26 located above and below the limit pin 31. Decide.

Note that in order to accurately form the gap l between the limit pin 31 and the through hole 26, the outer diameter must be the same as that of the through hole 26.
A cylindrical body (not shown) whose inner diameter is approximately equal to the inner diameter m of the limit pin 31 and whose inner diameter is approximately equal to the outer diameter n of the limit pin 31 is prepared, and the cell body 24 and the limit pin 3 are attached to the cell bracket 20.
When bolting 1, the limit pin 31 is inserted into the through hole 2 with the cylindrical body inserted around the outer periphery of the limit pin 31.
6, and in this state bolt the cell body 24 and limit pin 31 to the cell bracket 20,
After that, if the cylindrical body interposed between the through hole 26 and the limit pin 31 is removed, the through hole 2
6 and the limit pin 31 can be accurately formed.

In this way, the cell body 24 supported by the cell body support part 21 of the cell bracket 20 is provided with a through hole 26 for position regulation, and the cell located on the side of the cell body 24 is inserted into this through hole 26. bracket 20
A limit pin 31 with one end fixed to the side wall 22 of the limit pin 31 is inserted, and the outer peripheral surface of the limit pin 31 and the through hole 2
By forming a gap l of a predetermined amount between the cell body 24 and the inner peripheral surface of the cell body 6, if a load of more than a predetermined amount is applied to the cell body 24 and the cell body 24 attempts to deform by more than the predetermined amount, the cell body The inner circumferential surface of the position regulating through hole 26 formed in the cell body 24 comes into contact with the outer circumferential surface of the limit pin 31, and serves as a stopper to prevent the cell body 24 from being deformed more than a predetermined amount. Therefore, unlike conventional load cells, there is no need to form a stopper on the bottom plate of the cell bracket, so the bottom plate of the cell bracket can be omitted, and the height of the entire load cell can be kept low. I can do it.

Further, the shape of the cell bracket 20 is formed such that when the cell body 24 is attached to the cell body support portion 21 of the cell bracket 20, the side wall portion 22 of the cell bracket 20 is located on the side of the cell body 24. Even if the bottom base plate of the cell bracket is omitted,
The rigidity of the cell bracket 20 itself does not decrease.

[Brief explanation of the drawing]

Figure 1 is a plan view showing a conventional load cell, Figure 2 is a plan view showing a conventional load cell.
3 is a plan view showing the load cell according to the present invention, FIG. 4 is a front view thereof, FIG. 5 is a plan view of the cell bracket, and FIG. 6 is a front view thereof.
FIG. 7 is a side view thereof, FIG. 8 is a front view of the cell body, FIG. 9 is a plan view of the pan support bracket, FIG. 10 is a front view thereof, and FIG. 11 is a drawing showing the limit pin. 20...Cell bracket, 21...Cell main body support part, 22...Side wall part, 24...Cell main body, 26
...Through hole, 27...Plate support bracket, 31...
Limit pin, l... A gap formed between the inner circumferential surface of the through hole and the outer circumferential surface of the limit pin.

Claims (1)

[Claims for Utility Model Registration] Both ends of a vertically parallel beam are vertically connected to each other at a predetermined interval, one connected end is a fixed end, and the other connected end is vertically connected to each other at a predetermined interval. a cell body having a swinging end that swings, and a horizontal through hole formed in the swinging end; a cell bracket having an L-shape in plan view, the inner surface of which is arranged parallel to the longitudinal side surface of the cell main body at a predetermined distance, and the bottom surfaces of both sides of the cell bracket are placed and fixed on a base; and a cell bracket that is inserted into the through hole. and a limit pin whose base end is fixed to the inner surface in the longitudinal direction of the cell bracket, and between the upper and lower surfaces of the limit pin and the upper and lower inner surfaces of the through hole, there is a A load cell characterized in that a gap is provided to allow vertical movement of an end portion by a predetermined amount.