JPH0336895Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Industrial application field" The present invention relates to a waterproof scale structure.

``Prior Art'' Conventionally, when measuring the weight of fish, shellfish, pickles, etc. that have a large amount of moisture attached to them using a scale, the scale gets wet due to splashing water or liquid from the fish, shellfish, or pickles, and the moisture is trapped inside the scale. In addition, the scale used must be washed after measurement, and in this case too, the cleaning water may enter the inside of the scale, which may cause the scale to malfunction and reduce the durability of the scale. I had a problem with it getting worse.

Therefore, a waterproof scale structure as seen in Japanese Utility Model Application Publication No. 117531/1983 was devised. As shown in FIG. 8, a scale frame 4 having an electric display section 3 is attached to a base 1 via a rubber seal 2, and a weighing mechanism section (weight detection section) is provided on the base 1.
A support 6 is attached to the upper part of the weighing plate 5, and a weighing plate 8 is attached to the support 6 via a seal ring 9a on the upper part and a plate holder 7.
A ring-shaped retainer 10 is provided concentrically with the support 6 on the lower side of the periphery of the holder 9, and the outer periphery of the retainer 10 and the center of the scale frame 4 are fixed. A plurality of stud bolts 11 and 12 are planted upwardly in the edges of the holes formed in the holes, respectively, and these stud bolts 11 and 12 are
, a bellows (diaphragm) 1 provided in the labyrinth part 13 between the scale frame 4 and the retainer 10.
Fit the holes on the outer periphery and the inner periphery of 4, respectively fit the holes on the outer periphery of the plate holder 9 to each stud bolt 11, and screw the nut 15 onto the stud bolt 12 to attach it to the scale frame 4. The inner periphery of the bellows 14 is tightened and fixed with a nut 15, the nut 16 is screwed onto the stud bolt 11, the outer periphery of the bellows 14 and the retainer 10 are tightened and fixed with the nut 16 on the plate holder holder 9, and the balance frame 4 is tightened and fixed. The scale is designed to be waterproof so that liquid (water) does not enter between the center hole and the support 6.

``Problem to be solved by the invention'' However, in such a conventional waterproof scale structure, the bellows 1 are attached to the retainer 10 and the stud bolts 11 and 12 that are installed upward in the scale frame 4.
Since retainer 4 is attached, retainer 10,
Stud bolts 11, 1 from the top of the scale frame 4
2 protrudes, and for this reason, there is a risk that these stud bolts 11 and 12 may be bent during the manufacturing process, or that the stud bolts 11 or 12 may come off from the retainer 10 or the scale frame 4. Ta.

Further, since the retainer 10 and the scale frame 4 have protruding parts (stud bolts 11, 12), there is a problem in parts management that it is difficult to store these parts.

In addition, in order to attach the bellows 14, a retainer 10, a plate holder 9, etc. are required, and the number of parts is large.
There was a problem with high costs. Furthermore, since the inside of the scale is sealed, temperature changes can cause condensation inside, which can cause the display to fog up and internal electrical components to malfunction.

This invention solves the above problems of the conventional waterproof scale structure, prevents the occurrence of defective products during the manufacturing process, facilitates parts management, reduces the number of parts, and has a simple structure. The purpose is to provide a low-cost waterproof scale structure.

"Means for Solving the Problems" The present invention has the following configuration to achieve the above object. That is, on a support fixed to the upper part of the weight detection part and passed through a hole in the scale frame,
In a waterproof scale structure in which a scale plate is attached via a plate receiving plate and a diaphragm is provided between the support body, the scale frame, and the plate receiving plate, a space is provided in the circumferential direction near the hole edge of the scale frame. a plurality of internally threaded members are fixedly placed inside the frame;
One end of the diaphragm is fixed to the vicinity of the hole edge of the scale frame via a press plate by screwing this screw into the female thread member, and the other end of the diaphragm is fixed to the counter plate via the press plate. The diaphragm is fixed with screws, and the diaphragm is made of a gas-permeable rubber material.

``Function'' Not only is it waterproof, but a female threaded member for attaching a waterproof diaphragm is fixed to the inside of the scale frame, so this female threaded member does not protrude from the upper surface of the scale frame on the weighing plate side. , It is easy to manage parts during the manufacturing process or during parts management. Moreover, the diaphragm is made of a gas-permeable rubber material, which allows the moisture inside the scale to permeate to the outside, thereby suppressing the rise in humidity and preventing fogging of the display and deterioration of internal electrical components due to moisture. etc. will not occur.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIGS. 2 and 3 are external views of a waterproof scale embodying the present invention, with FIG. 2 being a front view thereof, and FIG. 3 being a side view thereof. Further, FIG. 5 is a sectional view showing the internal mechanism of this scale, and FIG. 4 is a plan view of this scale from which a weighing pan and a tray receiving plate, which will be described later, are removed.

The outline of the scale will be explained with reference to FIGS. 2 and 3.
A base 21 is attached to the bottom of the rectangular parallelepiped frame 22.
is arranged, and a weighing plate 54 is arranged on the upper surface. The base 21 is provided with four adjustment legs 21a. An operation unit 23 equipped with an input key is detachably attached to the front of the frame 22.
Further, a substantially L-shaped support 57 is attached to the rear surface facing upward, and a display section 58 for displaying various data is attached to the tip of this support 57.

The operating section 23 is provided with a transmitter, and input operations can be performed wirelessly from the operating section 23 separated from the frame 22 to the scale body via a receiver provided within the frame 22. There is.

This operation unit 23 is equipped with a so-called flat key with a resin key sheet pasted on its surface.
It is sealed to increase the waterproof effect. The surface of this key sheet becomes loose due to the expansion and contraction of the air inside the operation section 23 due to changes in the outside air temperature. For this reason, it not only looks bad, but also causes malfunction. Therefore, a hole is drilled at a predetermined position of the operating part 23, and the hole is made of a sheet with a continuous porous structure (for example, Goretex, Xytex, etc.) that is moisture permeable from the inside and strongly water repellent from the outside. ) from the inside.
Therefore, this operating section 23 can prevent the key sheet from loosening while maintaining the waterproof effect from the outside.

Next, the outline of the structure of this scale will be explained with reference to FIG.

The base 21 placed at the bottom of the frame 22 is attached via a waterproof rubber seal 21b. A support plate 56 that supports one end of a load cell 26a for weight detection is attached to the base 21 at a predetermined position. Also, at the other end of this load cell, there is a support 27 that supports a plate receiving plate 31, which will be described later.
The weight detecting section 26 is configured by attaching the important member 26b to which the weight detecting section 26 is attached.

The weighing plate 54 is supported by a plate receiving plate 31 provided on the lower surface thereof, and this plate receiving plate 31 is attached to the above-mentioned emphasis member 26b via a cylindrical support 27.

Next, the waterproof structure of the present application will be explained in detail with reference to FIGS. 1, 4, 6, and 7.

A protruding portion having a trapezoidal cross section and a circular planar surface is formed on the upper surface of the frame 22 . This protrusion has a hole 24 through which the support 27 is inserted. On this protrusion, the outer peripheral side plane of this hole 24 is used as a mounting surface for a waterproof diaphragm 41, which will be described later.
On the surface of this mounting surface, a plurality of female screw members (cap nuts) 25 are provided at predetermined intervals at positions concentric with the hole 24.
is arranged and welded to the frame 22 so that the screw hole of the cap nut 25 faces the upper surface.

A concave seat is formed at a predetermined position on the upper surface of the support body 27, and is fixed to the emphasis member 26b with a bolt 28 via a waterproof washer consisting of an O-ring 29 and a cover 30. The seat prevents the head of the bolt 28 from protruding from the upper surface of the support 27.

The plate support plate 31 has a substantially rectangular shape, and plate support rubbers 31b are attached to the four corners 34 of the plate support plate 31. This plate support rubber 31b has a substantially cylindrical shape, and has a hole penetrated through its axial center. This plate support rubber 3 is attached to the bottom surface of the weighing plate 54.
A pin 55 is welded downward at a position corresponding to the hole 1b. Therefore, the weighing plate 54 is attached to this pin 55.
is attached by fitting into the hole of the tray support rubber 31b.

A concave portion 33 having a substantially trapezoidal cross section and a circular plane is formed in the center of the tray receiving plate 31, and a concentric concave stepped portion 35 is formed at the opening edge of the concave portion 33. The lower surface of this recess 33 is arranged on the upper surface of the support 27 and is attached by a bolt 32 via a prevention washer. At this time, the head of the bolt 32 does not protrude beyond the stepped portion 35. In order to prevent water from entering the recess 33, a second waterproof gasket 53 is attached to the step 35 by adhesive so as to close the opening of the recess 33. Furthermore, this second packing 53
is configured to be thicker than the gap between the lower surface of the weighing plate 54 and the stepped portion 35 to provide a buffering effect to the center of the weighing plate 54. The material for this second packing 53 is optimally a closed cell structure of polyvinyl chloride.

A plurality of countersunk screw holes 31a are opened at predetermined intervals on the outside of the stepped portion 35 of the countersunk plate 31 and at positions concentric with the stepped portion 35. This countersunk screw hole 31
A first packing 36 made of an elastic member such as a rubber material (for example, nitrile rubber) is disposed on the lower surface of the portion where a is opened, and has a ring shape having a U-shaped cross section with flanges on both sides. A small hole 36a is formed in the attachment surface of the first packing 36 to the plate receiving plate 31 at a position corresponding to the countersunk screw hole 31a formed in the plate receiving plate 31. A ring-shaped holding plate 38 is arranged to sandwich the first packing 36 with the plate receiving plate 31 and is also concentric with the stepped portion 35 and has a cross section that fits with the flanges on both sides of the first packing 36. Ru. On the upper surface of this presser plate 38, a protrusion 38a is formed at a position corresponding to the small hole 36a of the first gasket 36, and protrudes upward to fit into the small hole 36a.
is drilled. The amount of protrusion of the protrusion 38a is made slightly smaller than the thickness of the first packing 36. or,
A plurality of countersunk holes 38c are formed on the upper surface of the presser plate 38 on concentric circles inside the projections 38a. A diaphragm 41 made of an elastic member such as a rubber material (for example, silicone rubber) is disposed between the lower surface of the holding plate 38 and the diaphragm mounting surface of the protrusion of the frame 22 described above. This diaphragm 41 includes a frame attachment part 42 that is attached to the protruding part of the frame 22, and a tray attachment part 43 that is located outside of the frame attachment part 42 and is attached to the presser plate 38, and each attachment part is formed in a concentric ring shape. There is. The dish receiving part 43 is the frame mounting part 4.
2, and is connected therebetween by a bellows portion 44 concentric with both mounting portions, which is made of a bellows thinner than the wall thickness of both mounting portions. The frame attachment part 42 has an L-shaped cross section with a flange 42b whose inner periphery rises upward to prevent water accumulated on the upper surface of the frame attachment part 42 from entering the weight detection part side. A hole 45 is formed in this frame mounting surface 42 at a position corresponding to the aforementioned cap nut 25. A presser plate 47 having a concentric ring shape and an L-shaped cross section with its inner circumferential side raised up is disposed on the upper surface of the frame mounting portion 42, and is used to hold the cap nut 2.
Holes 48 are formed at positions corresponding to the holes 5.
Further, a plate receiving plate mounting portion 43 is disposed on the lower surface of the holding plate 38, and a hole 46 is formed in the plate receiving plate mounting portion 43 at a position corresponding to the countersunk hole 38c of the holding plate 38. Further, on the lower surface of the dish receiving plate mounting portion 43, a holding plate 50 is disposed concentrically with the holding plate 50, which is ring-shaped and has an L-shaped cross section with the outer circumferential side falling downward. This presser plate 50 has a countersink hole 38c of the presser plate 38.
A screw hole 51 is formed at a position corresponding to.

6 and 7 are partially enlarged views of the first gasket 36 and the diaphragm 41, and the waterproof structure of the first gasket 36 and the diaphragm 41 will be explained with reference to these figures.

Small holes 36a are formed on the upper and lower surfaces of the first packing 36.
Annular protrusions 36b and 36c having a triangular cross section are formed concentrically to sandwich the two. These annular projections 36b, 36c connect the first packing 36 to the plate receiving plate 31.
When the presser plate 38 is clamped and fixed with the countersunk screws 39, a concentrated load is applied to the annular protrusions 36b, 36c, and the tips of the annular protrusions 36b, 36c are crushed, resulting in a large press acting on the plate receiving plate 31 and the presser plate 38. The action of pressure prevents water from entering. diaphragm 4
The upper surface of the tray receiving part 43 of No. 1 and the frame attaching part 4
Concentric annular protrusions 43a, 43b, 42a, and 42c with triangular cross sections formed on the lower surface of 2 are also formed for the same purpose. When the frame mounting part 42 is held between the frame 22 and the holding plate 47, and the machine screw 49 is screwed into the cap nut 25, and the machine screw 49 is used to fix the frame mounting part 42, water is prevented from entering the interior.

Note that if the diaphragm 41 is made of silicone rubber material, etc., the silicone rubber material has gas permeability and allows internal moisture to escape to the outside. Since the temperature increases due to the increase in heat, it is possible to prevent electrical insulation and internal parts from rusting or from clouding the display section 58.

The material of the diaphragm 41 is not limited to the above-mentioned silicone rubber material, but may also be a sheet with a continuous porous structure having moisture permeability and water repellency (for example, products such as Goretex and Zytex).

Next, the assembly order of the waterproof weighing scale section will be described.

a Place the frame attachment part 42 of the diaphragm 41 on the attachment surface of the protruding part of the scale frame 22 to which the cap nut 25 is welded, place the presser plate 47 on top of the frame attachment part 42, and screw the machine screw 4 into the scale frame 22.
9 fixes the inner flange 42 of the diaphragm 41 and the press plate 47.

b Fit the bellows part 44 of the diaphragm 41 into the inner periphery of the holding plate 50, sandwich the plate receiving part 43 of the diaphragm 41 between the holding plate 50 and the holding plate 38, and attach the plate receiving part to the holding plate 38 using the countersunk screws 52. Part 4
3 and the presser plate 50 are fixed.

c. From above the presser plate 38, the first
Fit the gasket 36, place the pan support plate 31 on the support 27, tighten and fix the pan support plate 31 to the support body 27 with bolts 32 via waterproof washers, and attach the presser plate 38 to the pan support plate 31. flat head screw 39
Tighten and fix.

d A second gasket 53 is attached to the stepped portion 35 of the tray receiving plate 31.
At the same time, a pin 55 is inserted into the center hole of the rubber plate receiver 31b, and the weighing plate 54 is mounted on the second packing 53 and the rubber plate receiver 31b. In addition,
The protrusion 38a is provided on the holding plate 38 to prevent the first packing 36 from being over-tightened by the countersunk screw 39, to press the first packing 36 with an optimal pressing force, and to prevent distortion of the first packing 36 due to over-tightening. This is to do so. The above completes the assembly of the upper part of the waterproof scale.

In this embodiment, one end of an annular diaphragm 41 made of an elastic member such as rubber and having a sealing property is fixed to the center of the scale frame 22 by tightening with a small screw 49 via a presser plate 47. 41 to the lower surface of the tray receiving plate 31, the first gasket 36, the presser plate 38, and the mounting member 50.
Since the diaphragm 41 is tightened and fixed by countersunk screws 39 and 52 through the diaphragm 41, the inside of the waterproof scale is sealed from the outside by both ends of the diaphragm 41, so that moisture from outside does not enter into the waterproof scale.

In addition, since the cap nut 25 is fixed to the weight detecting section 26 side near the hole edge of the scale frame 22, the cap nut 25 does not protrude from the top surface of the scale frame 22 on the scale plate 54 side, so that it can be used during the manufacturing process or as a component. There is almost no chance of damage to the scale due to other objects hitting the nut during maintenance, which improves durability, makes parts management easier, and facilitates assembly as each part can be attached sequentially from above. Furthermore, welding the nut to the scale frame as in the present embodiment is simpler and more reliable than welding the bolt to the scale frame as in the conventional method, thereby reducing costs.

"Effect of the invention" According to the invention, the weighing pan is attached to the support fixed to the upper part of the weight detection part and loosely passed through the hole of the weighing frame through the tray receiving plate, and the weighing pan is attached to the support and the weighing frame. and a waterproof scale structure in which a diaphragm is provided between the balance frame and the balance plate, wherein a plurality of nuts are fixed to a portion near the hole edge of the scale frame at intervals in the circumferential direction and positioned on the weight detection unit side. , one end of the diaphragm is fixed to the vicinity of the hole edge of the scale frame through a retaining plate by screwing the screw into the nut, and the other end of the diaphragm is secured to the counter plate through the retaining plate. In addition, the diaphragm is made of a gas-permeable rubber material, so it is not only waterproof, but also has a diaphragm attached to the weight detection section near the hole edge of the scale frame. Since the nut for attaching one end is fixed, this nut does not protrude from the upper surface of the weighing pan side of the weighing frame, which prevents damage to other parts during the manufacturing process or parts management. As a result, durability is improved, the number of parts is reduced, the structure is simplified, parts management becomes easier, and costs can be reduced. Further, surface treatment of the frame (for example, plating, polishing, hairlining, etc.) becomes easier. In addition, the diaphragm is made of a gas-permeable rubber material and can suppress an increase in humidity inside the scale, so that the display section does not become cloudy and internal electrical components do not deteriorate due to moisture.

[Brief explanation of drawings]

Figures 1 to 7 show an embodiment of the present invention, in which Figure 1 is a vertical sectional side view of the main part, Figure 2 is a schematic front view, Figure 3 is a schematic side view, and Figure 4 is a schematic side view. A plan view of the main part showing the inside with the weighing pan and plate receiving plate removed, Fig. 5 is a vertical side view of the main part, Fig. 6 is an enlarged sectional view of a part of the first packing, and Fig. 7 is the diaphragm. 8 is a schematic sectional view of a conventional waterproof scale, and FIG. 9 is a sectional view of a main part of a conventional waterproof scale. 22... Scale frame, 25... Female screw member (cap nut), 26... Weight detection section, 27... Support body,
31...Plate receiving plate, 38,47,50...Press plate,
41...Diaphragm, 49...Machine screw, 54...
...Weighing plate.

Claims (1)

[Claims for Utility Model Registration] A weighing plate is attached to a support that is fixed to the upper part of the weight detection unit and is passed through a hole in the scale frame through a plate receiving plate, and the weighing plate is attached to a support that is fixed to the upper part of the weight detection part and is passed through a hole in the scale frame, and In a waterproof scale structure in which a diaphragm is provided between the scale frame and the scale frame, a plurality of female screw members are fixed to a portion near the hole edge of the scale frame at intervals in the circumferential direction and positioned inside the frame, One end of the diaphragm is fixed to the vicinity of the hole edge of the frame with a screw through a holding plate by screwing this screw into the female threaded member, and the other end of the diaphragm is screwed onto the counter plate through the holding plate. A waterproof scale structure, wherein the diaphragm is made of a gas-permeable rubber material.