JPH025387Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a platform scale device used when measuring the weight of an object.

"Prior Art" Figures 10A and 10B are diagrams showing the configuration of a conventional platform weighing device, and in these figures, 1 indicates a frame 1a.
This is a fixed side framework constructed by arranging frames 1a and 1d in a substantially square shape, and is supported by support legs 2, . . . attached to each end of the frames 1a and 1b. On the other hand, 3 is a movable side framework arranged above the fixed side framework 1, and is constituted by arranging frameworks 3a to 3d in a substantially square shape. A weighing pan 5 is placed on the movable frame 3 via elastic members 4 for buffering. Between the frames 1c and 1d and between the frames 3c and 3
Plate bodies 6 and 7 are provided between d, respectively.
A load cell 8 is provided between these plates 6 and 7. When an object to be weighed is placed on the weighing pan 5, the load cell 8 is distorted by an amount corresponding to the weight of the object to be weighed.
The weight of the object to be weighed is measured by detecting it with a strain gauge installed in the weighing area.

"Problems to be Solved by the Invention" By the way, in the conventional platform weighing device described above, when an impact force acts on the weighing pan 5 from the side, there is no cushioning material for this, so the load cell 8
may be destroyed. Further, since the fixed side frame 1 and the movable side frame 3 had a structure using substantially square-shaped frames, there were the following drawbacks.

Frameworks 1 and 3 are frames 1a to 1d and 3a, respectively.
3d, the number of parts is large, and the weight of the entire platform weighing device is large, making it inconvenient to move when installing or changing the installation location.

In the process of manufacturing frameworks 1 and 3, there are many welding points, so the manufacturing process is complicated;
Therefore, the manufacturing cost is high and the product becomes expensive.

Since the frameworks 1 and 3 are assembled in a substantially square shape, there is little room for flexing. When an impact load is applied, the frameworks 1 and 3 are bent and the so-called buffering effect that absorbs the impact load does not work effectively.
There is a possibility that the load cell 8 may be destroyed due to this.

The present invention was developed in view of the above-mentioned circumstances, and provides a platform weighing device with a structure that minimizes the number of parts, has a simple and inexpensive structure, and can effectively alleviate the impact load transmitted from the outside to the load cell. It is intended to.

"Means for Solving the Problems" The present invention includes: a pair of fixed frames whose both ends are supported by support legs; a fixed connecting member that interconnects the central portions of the pair of fixed frames; A pair of movable frames arranged above the pair of fixed frames, each made of a hollow member and each end of which is a free end, each attached to each end of the pair of movable frames. is,
a buffer member that closes the opening at each end; a movable connecting member that connects the central portions of the pair of movable frames; one end is attached to the fixed connecting member, and the other end is attached to the movable frame. It is characterized by comprising a load cell attached to the connecting member, and a weighing pan placed on the pair of movable frames and whose inner surface abuts each of the buffer members.

"Operation" One end of the load cell is supported by a pair of fixed frames and a fixed connecting member, and the load applied to the weighing pan is transmitted to the other end of the load cell by a pair of movable frames and a movable connecting member. Ru. In this case, each end of each movable frame constituted by a hollow member is in contact with the inner surface of the weighing pan via a buffer member for the purpose of reducing weight.
When an impact force is applied to the weighing pan from the side, this impact force is sufficiently alleviated by the buffer member. In addition, since each end of each movable frame and each fixed frame is a free end, and has a so-called cantilever structure, when an impact load is applied from above to the end of the weighing pan, each movable frame By bending, the impact load transmitted to the load cell is sufficiently alleviated.Furthermore, when an impact load is applied to the center of the weighing pan from above, the impact load acting on the load cell is reduced by bending each fixed frame. sufficiently relieved.

"Embodiments" Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 3 are diagrams showing the configuration of an embodiment of the present invention. In these figures, 10a, 10
Reference numeral b designates a pair of fixed frames made of pipes having a rectangular cross-section and the same length, and are arranged so that their central portions are parallel to each other. Each of the fixed frames 10a, 10b has both ends bent at right angles in an arc shape to form a substantially U-shape. Further, a rubber cap 11 is attached to each end face of each fixed frame 10a, 10b, and support nuts 12, . . . are fixed by welding. A leg shaft 14a having a male thread is screwed into each leg shaft 14a. By rotating the support legs 14, the height and inclination of the fixed frames 10a, 10b can be adjusted (see FIG. 3). The fixed frames 10a, 10b are interconnected by a fixed connecting member 16 attached by welding between their central portions. The fixed connecting member 16 has a horizontal plate portion 16a and a vertical plate portion 16b.
The vertical plate part 16b is formed into a substantially convex shape so that the width of the vertical plate part 16b is narrow at the upper part. This vertical plate portion 16b has a fixed side (fulcrum side) of the load cell 18.
The end portion 18a is fixed by bolts 20, . . . , and the horizontal plate portion 16a functions as a cover to protect the lower surface of the load cell 18. Further, a cover 21 (see FIG. 3) made of a plate is attached to the lower surface of the fixed frames 10a, 10b. On the other hand, the fixed frame 10
Above the fixed frames 10a and 10b,
Similarly to b, a pair of movable frames 22a and 22b are arranged, each of which is made by bending pipe materials of the same size and square-shaped cross section into a U-shape, and these movable frames 22a and 22b They are mutually connected by a movable connecting member 24 attached by welding to. Movable connecting member 24
Similar to the fixed connecting member 16, the horizontal plate portion 24a is
The movable side (load side) end 8b of the load cell 8 is attached to the vertical plate part 24b by bolts 20, . . . It is fixed and the horizontal plate part 2
4a has a function as a cover that protects the upper surface of the load cell 18. In this case, as shown in FIG. 2, the horizontal width dimension la of the movable connecting member 24 is
is smaller than the width dimension lb of the fixed connecting member 16, and each movable frame 22 is
a, 22b are arranged to be shifted inward from above the respective fixed frames 10a, 10b. Taking advantage of this deviation, a stopper 26 is provided on each movable frame 22a, 22b. This stopper 26 is comprised of a nut 26a fixed by welding to each outer surface of the movable frames 22a, 22b, and an adjustment screw 26b screwed into a female threaded hole of this nut 26a. The lower end of this adjustment screw 26b is connected to the fixed frame 10a, 10b.
The movable frame 22 is in contact with each upper end surface of the
The downward movement of the movable frames 22a and 22b is regulated to protect the load cell 18 from overloading, and by rotating the adjustment screw 26b, the range in which the movable frames 22a and 22b can be moved downward is increased. It is now possible to adjust. Moreover, on the upper surface of each movable frame 22a, 22b,
Rubber plates 2 for cushioning are placed at three locations on both ends and the center.
8, . . . are respectively attached, and a weighing pan 30 is placed thereon via these rubber plates 28, . Furthermore, rubber blocks 32 for cushioning are provided at both ends of each movable frame 22a, 22b. In this case, in this embodiment, the fourth
A rubber block 32 is provided as shown in FIG. In this figure, a portion of the rubber block 32 is fitted into the opening at the end of the movable frames 22a, 22b, and its top and side surfaces are in contact with the inner surfaces of the four corners of the weighing pan 30. In addition, each rubber block 32 has a bush 3.
3 is embedded, a round hole 30a is formed at a location corresponding to the bush 33 of each weighing pan 30, and a screw 34 that is thinner in diameter than the round hole 30a is screwed into the bush 33 from the outside of the weighing pan 30. There is.
As a result, the rubber block 32 functions as a buffer material when an impact force is applied to the weighing pan 30 from the side, and also serves as a rust-proof lid that prevents moisture from entering the hollow portions of the movable frames 22a and 22b. It has the function of The fixed frame 10a
A vertical plate portion of an L-shaped mounting plate 36 is attached to the outer surface of the mounting plate 36 by welding, and a display case 38 is attached to the tip of the horizontal plate portion of the mounting plate 36 by screws. ing. The display case 38 houses a display drive circuit board 44 that displays the weight on the display 42 based on a signal supplied from the load cell 18 via a cable 40 (see FIG. 2). At the same time, a lever 46 of a switch for turning on and off this drive circuit is provided protrudingly. An opening 30b is provided in a portion of the weighing pan 30 that covers the display case 38 so that the display on the display 42 can be viewed from the outside.
(see FIG. 3) is formed, and a display window 48 is attached to this portion. Also, weighing pan 3
A hole 30c through which a lever 46 is inserted is formed in the side surface of the portion that covers the display case 38 of No.
is installed. Furthermore, display case 3
A recess 38a is provided at the front lower part of the device 8, so that it can be used as a handle by inserting a hand when carrying the device.

Next, modifications of each part of the above-described embodiment will be described. First, movable frames 22a, 22b
A weighing pan 30 is attached to each end of the weighing pan 30 via a rubber block 32.
The structure of the part to which the is attached may be any of the structures shown in FIGS. 4B to 4D in addition to the structure shown in FIG. Code 34 in Figure 4 B and C
4A is a locking member into which a screw 34 is screwed, 32a in FIG. 4D is a rubber material provided separately from the rubber block 32, and 33 is a cylindrical spacer. As shown in these figures,
In short, any structure may be used as long as it can effectively dampen the impact when impact is applied to the weighing pan 30 from any direction in the lateral direction.

The cross-sectional shapes of the fixed frames 10a, 10b and the movable frames 22a, 22b are not limited to square shapes, but may be, for example, annular shapes, and their external shapes may be any of the shapes shown in FIG. Shaped steel such as steel, channel material, or solid material may be used.
In short, the central part is connected by the fixed connecting member 16 and the movable connecting member 24, and each end is a free end to form a cantilever structure, and the movable frames 22a, 22
Any shape may be used as long as the free ends of the fixed frames 10a, 10b serve as stoppers when the free ends b are bent due to overweighing.

The shapes of the fixed connecting member 16 and the movable connecting member 24 are not limited to the L-shape, but may be U-shaped by providing vertical plate portions 16c and 24c as shown in FIG. 6A and 6B. By doing this, the load cell 18
Waterproof (dripproof) and dustproof effects are further improved. In addition, the fixed connecting member 16 and the movable connecting member 24
The load cell 18 is formed into an L-shape or a U-shape.
has been installed, the fixed frames 10a and 10b
The vicinity of the horizontal plate portions of the fixed connecting member 16 and the movable connecting member 24 of the movable frames 22a and 22b are reinforced, and the load cell 18 can be protected against uneven loads, allowing accurate load detection.
On the other hand, if the load cell 18 does not need to be waterproof or dustproof, the horizontal plate parts 16a and 24a may be omitted as shown in FIGS. 7A and 7B.

The support legs 14 may be attached to the side surfaces near the end faces of the fixed frames 10a, 10b, as shown in FIG. 8A. And fixed frame 1
Each end face of the fixed frames 10a, 10b may be closed with a rubber cap 52 to prevent rust on the inner surfaces of the hollow portions 0a, 10b. Alternatively, as shown in FIG. 8B, the end faces of the fixed frames 10a and 10b may be fixed and closed by supporting nuts 12 of the same size as these end faces by welding.

The fixed frames 10a, 10b and the movable frames 22a, 22b are not only made by bending pipe materials, but also by joining separate pipe materials 56a to 56c by welding as shown in FIG. Of course, this is also possible.

According to the embodiment described above, each movable frame 22
Since the rubber block 32 is interposed between each end of the weighing pan 30 and the ends of the weighing pan 30, a sufficient cushioning effect can be obtained against the impact applied to the weighing pan 30 from the side. In addition, the fixed frames 10a, 10
b and movable frames 22a, 22b are constructed only by bending hollow pipe material, and one fixed connecting plate is provided between each fixed frame 10a, 10b and between each movable frame 22a, 22b. 16 and the fixed frames 10a, 10b connected only by the movable connecting plate 24.
By making the movable frames 22a and 22b substantially the same U-shape, the width dimension lb of the fixed connecting plate 16 can be reduced.
And the width dimension la of the movable connecting plate 24 is the load cell 18.
The fixed connecting plate 16 and the movable connecting plate 24 have the minimum dimensions necessary for attaching the load cell 18, and the fixed connecting plate 16 and the movable connecting plate 24 function not only as connecting members but also as a cover to protect the upper and lower surfaces of the load cell 18. Since the movable frames 22a, 22b are arranged inwardly with respect to the fixed frames 10a, 10b, in which the rubber block 32 serves as both a cushioning material and a lid, the upper surface of the fixed frames 10a, 10b is in contact with the backing plate of the stopper 26. The number of parts, welding points, and screws for assembly are reduced, and the shape of each part is simplified. This simplifies various processing operations and parts management in the manufacturing process of each part, simplifies welding and screwing operations during product assembly, and further reduces the weight of the product. , weight reduction can be achieved while reducing manufacturing costs. In addition, the movable frame 22
Each end of the movable frames 22a and 22b is a free end and has a cantilever structure, so when an impact load is applied from above to the four corners of the weighing pan 30, each movable frame 22a and 22b By bending, the impact load transmitted to the load cell 18 is sufficiently alleviated.
b are independently supported by the support legs 14, so that when an impact load is applied from above to the center of the weighing pan 30, each fixed frame 10
By bending a and 10b, the impact load acting on the load cell 18 is sufficiently alleviated.

In addition, since the movable frames 22a and 22b are bent at each end as described above and spread out in all directions from the center of the weighing pan 30, they can effectively hold the weighing pan 30 and are movable with the fixed connecting member 16. Connecting member 24
Therefore, in order to prevent the weighing pan from deforming when weighing heavy objects, the weighing pan must be made of a thick plate, or the weighing pan can be made narrower. It is no longer necessary to place a reinforcing frame on the bottom surface of the machine, and the plate thickness of each component can be made thinner, which also reduces manufacturing costs and weight. Furthermore, if it is desired to increase the holding area of the weighing pan 30, a rubber plate 24 may be attached on the movable connecting plate 24.

In addition, since the internal space of the weighing pan 30 can be secured sufficiently, it is possible to store options such as a power supply device and a printer device in addition to the display case 38 described above.
The inside of the camera is highly drip-proof and waterproof, so there is no need to install a separate optional protective case.

"Effects of the Invention" As explained above, according to the present invention, a pair of fixed frames whose both ends are supported by support legs, and a fixed connection that interconnects each central part of the pair of fixed frames are provided. a pair of movable frames arranged above the pair of fixed frames, each made of a hollow member, each end of which is a free end; and each end of the pair of movable frames. a buffer member that is attached to each of the movable frames and closes the opening at each end; a movable connecting member that interconnects the central portions of the pair of movable frames; and one end that is attached to the fixed connecting member and the other. Since a load cell whose end portion is attached to the movable connecting member and a weighing pan placed on the pair of movable frames and whose inner surface abuts each of the buffer members are provided, the hollow portion of the movable frame is prevented. It is highly effective against rust, and the number of parts can be kept to a minimum, resulting in a simple and inexpensive structure. A sufficient impact effect can be obtained even against the impact force applied from the direction, and therefore, an effect can be obtained in which the impact load transmitted from the outside to the load cell can be effectively alleviated.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the structure of an embodiment of the present invention, Fig. 2 A and B are a partially cutaway plan view and front view showing the structure of the same embodiment, and Fig. 3 shows the structure of the same embodiment. 4A is a partially cutaway plan view showing the configuration of the rubber block 32 in the same embodiment, FIGS. 4B to 4D are partially cutaway plan views showing other configuration examples of the rubber block 32, Figures A to C show fixed frames 10a, 10b and movable frames 22a, 2.
A plan view showing other configuration examples of 2b, FIG.
B is a cross-sectional view showing other configuration examples of the fixed connection plate 16 and the movable connection plate 24, FIG. 7A and B are perspective views showing other configuration examples of the fixed connection plate 16 and the movable connection plate 24, and FIG. A and B are partially cutaway plan views showing other attachment examples of the support leg 14, and FIG. 9 is a fixed frame 10a, 10b and a movable frame 22.
a, a plan view showing other configuration examples of 22b, the first
Figures 0A and 0B are a plan view and a side view showing the configuration of a conventional platform weighing device. 10a, 10b...Fixed frame, 14...Support leg, 16...Fixed connection member, 18...Load cell, 2
2a, 22b...movable frame, 24...movable connection member, 30...measuring pan, 32...rubber block.

Claims (1)

[Scope of utility model registration request] A pair of fixed frames each supported horizontally by support legs attached to both ends, a fixed connecting member that interconnects each central portion of the pair of fixed frames, and an upper portion of the pair of fixed frames. a pair of movable frames each formed of a hollow member and each end of which is a free end; a buffer member that closes the opening; a movable connecting member that connects each central portion of the pair of movable frames; one end of the movable frame is attached to the fixed connecting member, and the other end is attached to the movable connecting member. 1. A platform weighing device comprising: a load cell; and a weighing pan that is placed on the pair of movable frames and whose inner surface abuts each of the buffer members.