JP2024011085A - Display for waterproof platform scale - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display with high productivity and capable of being provided in a waterproof platform scale.

SOLUTION: A display for waterproof platform scale comprises: a rear frame including a storage part opened in front and bulging to a back face and a flange part circumferentially provided in an opening of the storage part; a front frame provided with a central opening in a center, disposed in front of the rear frame and assembled to the rear frame; a gasket as annular sealing material, disposed between the front frame and the rear frame; and a front chassis disposed in front of the front frame. A side edge part of a back face of the front chassis is provided with a plurality of bosses with nuts pressure-fitted. The front frame, and the flange part of the rear frame are respectively provided with insertion holes corresponding to the plurality of bosses. The fixation member is fitted into an insert nut from the back face of the rear frame through insertion holes of the rear frame and the rear frame. The front frame and the rear frame are configured to hold the gasket therebetween for co-fastening with the front chassis. Thus, a man hour for processing a frame composed of stainless steel is reduced to improve productivity.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to the structure of a waterproof indicator provided in a waterproof platform scale.

Platform scales are widely used in a variety of situations, including weight measurements and distribution centers. There is a platform scale in which a display is provided separately from the platform scale body so that the weighing results can be easily viewed (for example, Patent Document 1). In waterproof platform scales such as those used in water areas, not only the scale itself but also the display are waterproofed. The housing of the waterproof display is made of stainless steel, which has high corrosion resistance.

An aspect of a conventional waterproof display will be described with reference to FIG. As shown in FIG. 8, a conventional display 901 includes a top sheet 910, a front housing 930, a chassis 920, a gasket 940, and a rear housing 950.

The front casing 930 is a box with an open back, an inner flange 939 is provided around the back opening, and a plurality of screw holes 931 are formed in the inner flange 939. Inside the front casing 930, there are precision instruments and parts (hereinafter referred to as internal structures) arranged inside the casing, such as a control unit (not shown), a board equipped with a memory, switches, wiring, etc. (hereinafter referred to as internal structures). is fixed and housed.

The rear casing 950 is a lid attached to the opening of the front casing 930, and has insertion holes 951 corresponding to the screw holes 931 formed in its side edges.

The gasket 940 is a sealing material sandwiched between the front housing 930 and the rear housing 950, and is an annular rectangular body formed to correspond to the inner flange, and is provided with an insertion hole 941 corresponding to the screw hole 931.

Chassis 920 is a resin molded product, supports internal structures, and is disposed inside front casing 930. A plurality of bosses 921 are provided on the chassis 920, and through holes 938 corresponding to the bosses 921 are formed on the surface of the front housing 930.

When assembling the display 901, first place the chassis 920 that supports the internal structure inside the front housing 930, insert the tapping screws 990 from the surface of the front housing 930 into the through holes 938, and then tighten the bosses 921. shall be concluded. Next, the gasket 940 is positioned and attached to the inner flange using double-sided tape 980 having an insertion hole 981 formed therein, and is temporarily fixed. Next, cover the back side of the front case 930 with the rear case 950 over the gasket 940, insert the bolts 960 through the insertion holes 951, 941, and 981 from the back side of the rear case 950, and screw them into the screw holes 931. . Thereby, the front housing 930 and the rear housing 950 are fixed with the gasket 940 sandwiched therebetween.

JP2012-98164

However, the display 901 is a waterproof display, and the front casing 930 and the rear casing 950 are made of hard stainless steel, which makes them difficult to process. The front housing 930 is formed into a box by bending and welding a stainless steel plate. Furthermore, in order to form the through holes 938 and screw holes 931 in the front housing 930, a large number of punches and taps were performed on a hard stainless steel plate, which required a lot of processing time. In addition, there are many machining steps such as creating a recess so that the head of the tapping screw 990 does not protrude from the surface of the front casing 930 and bending the inner flange 939 to make it flush, requiring high machining accuracy and reducing productivity. It was bad.

The present invention has been made in view of these circumstances, and provides a display device that is highly productive and can be installed in a waterproof platform scale.

In order to solve the above problem, an indicator included in a waterproof platform scale according to an aspect of the present disclosure has a housing part that is open at the front and bulges out at the back, and a flange part provided around the opening of the housing part. a rear casing; a front casing that is provided with a central opening in the center and is disposed in front of the rear casing and assembled to the rear casing; and between the front casing and the rear casing; a gasket, which is an annular sealing material disposed in An insert nut is press-fitted into the inner hole of the boss, and the flange portions of the front casing and the rear casing are provided with insertion holes corresponding to the plurality of bosses. A fixing member is inserted into the rear housing and the insertion hole of the rear housing from the back side of the housing and fastened to the insert nut, and the front housing and the rear housing sandwich the gasket. The front chassis is configured to be fastened together with the front chassis.

According to this aspect, since the front casing and the rear casing are fastened to the front chassis, there is no need to perform screw processing on the casing made of hard stainless steel. With a configuration in which the rear casing is provided with a storage section and an outer flange, and the front casing is used as a lid, there is no need for welding to form the casing, reducing the number of processing steps and improving productivity.

Further, in one embodiment, a standing wall protruding from the rear surface is provided around the rear surface of the front chassis on the inside at a predetermined distance from the side edge, and the central opening of the front chassis is provided with a standing wall protruding from the rear surface. The part is provided with an inner circumferential wall protruding from the rear surface, and when the front chassis is placed in front of the front casing, the vertical wall enters the central opening of the front casing, An inner circumferential portion of the vertical wall is disposed in front of the accommodating portion, and the inner circumferential wall of the front casing and the vertical wall of the front chassis form a seal groove filled with a sealing material.

A sealing groove is formed by forming a vertical wall and cooperating with the front casing to fill the sealing material, thereby ensuring sealing performance between the chassis and the casing. In addition, by providing a large opening in the center of the front chassis, equipment fixed to the front chassis can be accommodated from the front chassis opening into the housing section of the rear chassis, and the chassis is not covered with stainless steel material. Wireless communication can be performed through the opening without being blocked by radio waves.

As is clear from the above description, it is possible to provide a display device that is highly productive and can be included in a waterproof platform scale.

1 shows a front perspective view of a platform scale equipped with a display unit according to a preferred embodiment of the configuration of the present disclosure. The rear perspective view of the same scale is shown. A front perspective view of the display device is shown. A rear perspective view of the display device is shown. An exploded perspective view of the display device is shown. 5 is an end view taken along line AA in FIG. 4. FIG. The front housing and front chassis are shown. FIG. 7(A) shows the state before the two are combined. FIG. 7(B) shows the state after the two are combined. FIG. 2 is an exploded rear perspective view of a conventional display device.

Hereinafter, specific embodiments of the configuration of the present disclosure will be described with reference to the drawings. The embodiments are illustrative rather than limiting the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(Embodiment)
Preferred embodiments of the configuration of the present disclosure will be described with reference to the drawings. FIG. 1 is a front perspective view of a platform scale SC including a display 1 according to an embodiment. FIG. 2 is a rear perspective view of the platform scale SC.

As shown in FIGS. 1 and 2, the platform scale SC is a waterproof platform scale having an upright display 1. The platform scale SC mainly includes a platform scale body 2 which is a load measuring section, a column 6 extending upward from the side surface of the platform scale body 2, and a display 1 supported by the upper end of the column 6 and displaying the weighing results.

The platform scale main body 2 has a weighing mechanism that measures the load of an object to be weighed placed on the top surface of the platform scale main body 2. For the measuring mechanism, a conventionally known structure such as a load cell is used, and its type is not limited.

The support column 6 is composed of a prismatic pipe, and its lower part is horizontal and is curved upward at approximately 90 degrees in the middle, supporting the display device 1 at its upper end and fixed to the lower side surface of the scale body 2 at its lower end. has been done.

The display 1 includes a display screen 1c and an operation switch 1d, and serves as an operation section for displaying weighing results, status, etc., and for inputting settings and conditions. Inside the display device 1, an internal structure including a control unit that performs various arithmetic processing and the like is housed.

A Y-shaped display support portion 6a with a bifurcated tip and supporting the display device 1 is provided at the upper end of the support column 6. The display 1 is held between both ends of the display support 6a, and bolt-shaped shaft bodies 4, 4 are fastened to the left and right sides of the display 1 with their central axes aligned. As a result, the display 1 is pivotally supported at the upper end of the support column 6 so as to be able to swing vertically, and the user can use the display 1 by tilting it at an angle that is convenient for the user.

The first cable C1 provided on the back of the display 1 supplies power to the display 1 as a power cable. The display device 1 is configured to be capable of wirelessly and wired data communication with an external device such as a printer or a personal computer, and is equipped with a wireless communication module that enables wireless data transmission and reception. The connector of the first cable C1 is a USB connector, and the first cable C1 also serves as a communication cable during wired communication with an external device.

Furthermore, a second cable C2 is also connected to the back of the display 1. The second cable C2 is inserted into the hollow support column 6 and connected to the platform scale main body 2. The platform scale main body 2 is supplied with power via the second cable C2, and the weighing data acquired by the platform scale main body 2 is output to the display 1 (control unit) via the second cable C2. The output weighing data is converted into a load value by arithmetic processing in the control section and displayed on the display screen.

(Structure of display)
The structure of the display 1 will be explained in detail using the drawings. FIG. 3 is a front perspective view of the display 1. FIG. 4 is a rear perspective view of the display 1.

As shown in FIGS. 3 and 4, the display 1 includes a front part 1a that is flat and approximately rectangular parallelepiped in the front-rear direction, and a rear part 1b that is approximately rectangular parallelepiped and is slightly smaller than the outer shape of the front part 1a. , the outer shape is aligned in the front-rear direction with the centers aligned.

A pair of attachment parts 8 are welded to the back surface of the rear part 1b. Through holes are formed in the mounting parts 8, 8, and nuts into which the shaft bodies 4, 4 can be screwed are welded with their axes aligned horizontally. The display device 1 is supported so as to be swingable about the horizontal axis by inserting the shaft bodies 4, 4 through the display support portion 6a and screwing them into the mounting portions 8, 8.

Cable bushes 9, 9 for waterproofing are provided in the rear portion 1b. A first cable C1 and a second cable C2 (not shown in FIG. 4), one end of which is connected to a board or the like inside the display 1, are pulled out from the cable bushes 9, 9 to the outside of the display 1. .

Next, the configuration of the display device 1 will be explained using FIG. 5. FIG. 5 is an exploded rear perspective view of the main components of the display 1.

As shown in FIG. 5, the display 1 includes a top sheet 10, a front chassis 20, a front housing 30, a gasket 40, a rear housing 50, and a rear chassis 80, which are arranged and assembled in this order from the front side. It is being

The front casing 30 and the rear casing 50 are the casings of the display 1, and are made of sheet metal made of stainless steel, and have substantially constant wall thicknesses.

The front chassis 20 and the rear chassis 80 are injection molded products made of resin members, and support internal structures.

The rear casing 50 has a rectangular parallelepiped shape and is mainly composed of a container-shaped accommodating part 59 that is open at the front and expands toward the back, and a flange part 53 that is provided around the front opening of the accommodating part 59 with a predetermined width. has been done. The rear casing 50 is the main casing of the display device 1, determines the approximate external shape of the display device 1, and internal structures are arranged inside the housing portion 59.

A rectangular engagement hole 57 in which the rear chassis 80 engages and a round hole 58 in which the cable bush 9 engages and the cable is taken out are provided on the back surface of the accommodating portion 59.

The flange portion 53 is provided with a plurality of insertion holes 51 (ten in this embodiment) at regular intervals, through which the fixing members 60 for fixing the casing are inserted. Further, near the right corner of the lower side of the flange portion 53, a small-diameter grounding insertion hole 52, which is different from the insertion hole 51, is provided. A grounding bolt 70 for locking a grounding wire is inserted into the grounding insertion hole 52.

The rear casing 50 is formed by pressing a single rectangular stainless steel plate, and includes a housing portion 59 and a flange portion 53 that are integrally and continuously formed, and an outer peripheral edge and an inner peripheral edge. The side edges are slightly bent forward and have a shape that stands up forward. For this reason, a side wall 54 that protrudes forward is provided around the outer peripheral edge of the flange portion 53, and an engaging wall 56 that projects forward is provided on the inner peripheral side edge of the engagement hole 57. It is surrounded.

The front casing 30 is a lid of the rear casing 50, and is disposed in front of the rear casing 50 and attached to the rear casing 50. The front casing 30 has approximately the same external shape as the flange portion 53, is rectangular in front view, has a large rectangular central opening 36 formed in the center, and has a plate frame having a substantially constant thickness and a constant width. It has a shape.

The front casing 30 is formed by pressing a single rectangular stainless steel plate, and has an outer peripheral edge and an inner peripheral edge bent toward the front, and has a shape that stands up toward the front. ing. For this reason, an outer circumferential wall 34 protruding forward is provided at the outer circumferential edge of the front casing 30, and an inner circumferential wall 37 protruding forward is provided at the inner circumferential edge. The front housing 30 is provided with a plurality of insertion holes 31 corresponding to the insertion holes 51 of the rear housing 50, and a cell spacer 32 to which a grounding bolt 70 can be fastened is provided near the right corner of the lower side. It is fitted.

The gasket 40 is an annular sealing material made of a resin elastic member, disposed between the front casing 30 and the rear casing 50, and held between the two to prevent water from entering the inside. The gasket 40 has a rectangular shape when viewed from the front, has a large rectangular opening 46 formed in the center, and has a plate frame shape having a substantially constant thickness and a constant width.

The gasket 40 is provided with a plurality of insertion holes 41 that communicate with the insertion hole 31 of the front housing 30 and the insertion hole 51 of the rear housing. Further, near the right corner of the lower side of the gasket 40, a grounding insertion hole 42 through which the cell spacer 32 is inserted is provided.

As described above, the front chassis 20 supports internal structures and is disposed in front of the front housing 30 , and the front housing 30 , the gasket 40 , and the rear housing are assembled to the front chassis 20 .

The front chassis 20 has a substantially rectangular plate-like outer shape, has a flat front surface, and has bosses and support portions protruding from the rear surface for fixing internal structures.

On the back surface of the front chassis 20, a standing wall 25 is formed inwardly at a distance from the side edges by a substantially constant distance and projects toward the back surface. The vertical wall 25 has a rectangular shape when viewed from the rear and is provided without a break. In the front chassis 20, the outside of the standing wall 25 is referred to as an outer peripheral part 23, and the inside of the standing wall 25 is referred to as an inner peripheral part 27.

The outer peripheral portion 23 constitutes a side edge portion of the front chassis 20, and a plurality of bosses 21 are provided on the back surface. An insert nut 90 into which the fixing member 60 can be screwed is press-fitted into the inner hole of the boss 21 . A front casing 30, a gasket 40, and a rear casing 50 are fastened to the outer peripheral portion 23, and their respective insertion holes 31, 41, and 51 are all provided corresponding to the bosses 21. A slightly recessed rectangular recess 22 is formed between adjacent bosses 21.

A display opening 26 is formed as a horizontally elongated window in the upper central region of the inner peripheral portion 27 . With the display device 1 assembled, a liquid crystal panel (not shown) mounted on a substrate is placed on the back side of the display opening 26. The inner peripheral portion 27 is also provided with a hole into which a push switch, which is one of the internal structures, is fitted, and a boss, a recess, and the like that support a board.

The top sheet 10 is a sheet on which a design such as a manufacturer's logo, icons and characters indicating the functions of switches, etc. are depicted, and is waterproofed and pasted on the surface of the front chassis 20.

A rectangular transparent section 18 is provided in the center of the top sheet 10, which is a transparent area that allows the rear side to be seen through. The transparent portion 18 is provided corresponding to the display opening 26, and information displayed on a liquid crystal panel (not shown) disposed inside as one of the internal structures is transmitted through the transparent portion 18 and the display. It can be visually recognized through the opening 26. The top sheet 10 is strongly attached to the surface of the front chassis 20 with an adhesive that also serves as a seal, and water will not enter through the gap or the display opening 26.

The rear chassis 80 supports a portion of the internal structure and engages with the rectangular engagement hole 57 of the rear housing 50 .

The rear chassis 80 includes a rectangular frame-shaped engagement portion 83 that constitutes the outer peripheral portion of the rear chassis 80 and engages with the engagement hole 57, and a rectangular frame-shaped engagement portion 83 that protrudes in front of the engagement portion 83 to support internal structures. It consists of a support part 87. The center portion of the rear chassis 80 has a large opening so that the second cable C2 connected to the internal structure is inserted therethrough.

Holes 84 are formed at the four corners of the back surface of the engaging portion 83, into which a second insert nut 91 is press-fitted. The second insert nut 91 is provided for screwing a lid 89 that closes the opening of the rear chassis 80 with a screw 92 (see FIG. 4). Furthermore, an engagement wall 88 is provided around the rear side edge of the engagement portion 83 . An annular sealing material 61 that seals the lid 89 is fitted around and engaged with the engagement wall 88 .

(Indicator assembly status)
The assembled state of the display 1 will be explained using FIG. 6. FIG. 6 is a sectional view taken along line AA in FIG. 4. The AA line passes through the fixing member 60 above the center and does not pass through the fixing member 60 below the center. In FIG. 6, the horizontal boundary at the center of the AA bend is shown by a two-dot chain line, and the internal structure is shown by a dotted line.

As shown in FIG. 6, the front casing 30 and the rear casing 50 are arranged on the back surface of the front chassis 20 with a gasket 40 sandwiched between them from the front and back. The boss 21 of the front chassis 20 is inserted through the insertion hole 31 of the front housing 30 and the insertion hole 41 of the gasket 40 . The inner hole of the insert nut 90 press-fitted into the inner hole of the boss 21 communicates with the insertion hole 51 of the rear housing 50, and the fixing member 60 is screwed into the insert nut 90 from the back side of the rear housing 50. There is. That is, the front housing 30, the gasket 40, and the rear housing 50 are fastened together by the fixing member 60 and fixed to the front chassis 20. The fixing member 60 is a bolt with a washer made of stainless steel.

The outer shape of the standing wall 25 protruding from the back surface of the front chassis 20 is configured to be slightly smaller than the outer shape of the inner circumferential wall 37 of the front housing 30. Therefore, the front chassis 20 comes into contact with the front surface of the front housing 30 at the back of the outer peripheral part 23, and the inner peripheral part 27 including the standing wall 25 enters the central opening 36 of the front housing 30, and the rear housing 50 It is arranged on the front side of the housing section 59 of. Therefore, the internal structures supported by the support portions and bosses provided on the inner peripheral portion 27 are housed inside the housing portion 59.

The side wall 54 of the rear casing 50 fits inside the outer peripheral wall 34 of the front casing 30 and is combined with the outer peripheral wall 34 of the front casing 30, and a gasket 40 is disposed between the front casing 30 and the rear casing 50. A gasket 40 is held between the front casing 30 and the rear casing 50 to fill the gap therebetween, and serves as a sealing material to prevent water from entering through the gap between the front casing 30 and the rear casing 50.

The inner circumferential wall 37 of the front housing 30 forms a seal groove Gr1 together with the vertical wall 25 of the front chassis 20 disposed inside. The seal groove Gr1 is circumferentially arranged in a rectangular shape, and the inside thereof is filled with a sealing material M (silicone). The sealing material M prevents water from entering through the gap between the front chassis 20 and the front housing 30.

Similarly, as shown in FIG. 6, the rear chassis 80 is arranged on the back surface of the rear housing 50, engages with the engaging hole 57 of the rear housing 50 at the engaging part 83, and extends forward from the engaging part 83. The protruding support portion 87 enters the inside of the housing portion 59 from the engagement hole 57, and the internal structure supported by the support portion 87 is disposed inside the housing portion 59.

The front surface of the engagement portion 83 of the rear chassis 80 comes into contact with the back surface of the accommodating portion 59, and the support portion 87, which is configured to be smaller than the outer diameter of the engagement hole 57, enters the engagement hole 57. The engagement wall 56 provided in the opening and the outer peripheral side surface of the support portion 87 form a seal groove Gr2. The seal groove Gr2 provided around the circumference in a rectangular shape is filled with a sealing material M (silicone). The sealing material M prevents water from entering through the gap between the rear chassis 80 and the rear housing 50.

Further, as shown in FIG. 6, an annular seal member 61 made of an elastic member is engaged with an engagement wall 88 provided around the back surface of the engagement portion 83. A lid 89 made of a stainless steel plate is arranged on the back side of the annular sealing material 61 to close the opening of the rear chassis 80. The annular sealing material 61 and the lid 89 are screwed to the rear chassis 80 with screws 92 (see FIG. 4). The opening of the rear chassis 80 is sealed with an annular sealing material 61 and closed with a lid 89, thereby preventing water from entering through the opening of the rear chassis 80.

A top sheet 10 is attached to the surface of the front chassis 20 so as to cover almost the entire surface of the front chassis 20. The top sheet 10 includes, for example, a transparent portion 18 that becomes the display screen 1c, and circular icons that match the arrangement of push switches provided as internal structures. The design matches the layout of the internal structures.

(Display assembly process)
The assembly process of the display 1 will be explained using FIGS. 5, 6, and 7. FIG. 7 shows the front chassis 20 and the front housing 30. FIG. 7(A) shows the state before the two are combined. FIG. 7(B) shows the state after the two are combined.

As shown in FIG. 7A, as a preparation before assembly, an insert nut 90 is press-fitted into the inner hole of the boss 21 of the front chassis 20.

First, attach double-sided tape T to the rectangular recess 22 on the back of the front chassis 20, cover the front casing 30 from the back of the front chassis 20, insert the insertion hole 31 into the boss 21, and paste the front casing 30 temporarily. Stop it. When the front surface of the front chassis 30 comes into contact with the back surface of the outer peripheral portion 23 of the front chassis 20, the vertical wall 25 of the front chassis 20 is arranged inside the central opening 36 of the front chassis 30, and a seal groove Gr1 is formed. . The formed seal groove Gr1 is filled with a sealing material M. In this way, the front chassis 20 and the front housing 30 are first assembled and sealed.

Similarly, the rear chassis 80 and rear housing 50 are assembled. Slightly recessed rectangular recesses 82 are formed on the four sides in front of the engaging portion 83 of the rear chassis 80 (see FIG. 6), to which double-sided tape is pasted. Insert the rear chassis 80 into the engagement hole 57 of the rear housing 50 from the back side, bring the front of the engagement part 83 of the rear chassis 80 into contact with the back of the housing part 59, and insert the rear chassis 80 into the engagement hole 57 of the rear chassis 50. Paste 80 and temporarily fix it. A seal groove Gr2 is formed by the engagement wall 56 protruding forward from the peripheral edge of the engagement hole 57 and the outer surface of the support portion 87. The sealing material M is filled into the formed sealing groove Gr2. Thereby, the rear chassis 80 and the rear housing 50 are assembled and sealed.

Next, the rear housing 50 to which the rear chassis 80 is assembled and the front housing 30 to which the front chassis 20 is assembled are assembled with the gasket 40 in between, and the fixing member 60 is fastened to the insert nut 90. . As a result, the front casing 30 and the rear casing 50 are tightened together and assembled, and sealed with the gasket 40.

When the front casing 30 and the rear casing 50 are combined, a portion of the back surface of the front chassis 20 comes into contact with the front surface of the rear chassis 80 within the accommodating portion 59, thereby connecting the two. Specifically, as shown in the diagram below the two-dot chain line in FIG. The through hole 86 formed in the distal end surface of the support portion 87 and the inner hole of the attachment boss 29 communicate with each other. By screwing and fastening the tapping screws TP here, the rear chassis 80 and the front chassis 20 are connected, and the arrangement of the rear chassis 80, the front chassis 20, and the internal structures supported by them is stabilized.

Thereafter, the opening of the rear chassis 80 is closed and the lid 89 is screwed with the screw 92, and the opening of the rear chassis 80 is sealed with the annular sealing material 61 and closed.

When the front casing 30 and the rear casing 50 are combined, the cell spacer 32 protruding from the back surface of the front casing 30 has a grounding insertion hole 42 of the gasket 40 and a grounding insertion hole 52 of the rear casing 50. is inserted. A grounding bolt 70 is inserted through the grounding insertion holes 52 and 42 from the back side of the assembled rear housing 50, and is screwed into the cell spacer 32.

The internal structure (not shown) includes a grounding metal piece attached to the board, and at least a portion of the metal piece is configured to come into contact with the housing portion 59. By connecting the ground wire to the ground bolt 70 according to the usage situation, the user can release static electricity from the display 1 and the scale body 2 from the ground wire. To prevent a user from being electrocuted by touching leaked electricity and to prevent generated static electricity from adversely affecting measurement data.

Finally, the top sheet 10 is attached to the surface of the front chassis 20. The surface of the front chassis 20 is provided with slight protrusions and depressions that guide the placement of the top sheet 10, and the top sheet 10 is attached to the front chassis 20 while being guided by these.

(effect)
The effects of the display device 1 configured as described above will be explained.

The stainless steel material used for the housing of waterproof indicators is extremely hard and difficult to process. Conventionally, a housing was formed by bending and welding a stainless steel plate, and then screw holes and through holes were formed, as well as an inner flange, which required many processing steps, resulting in poor productivity.

On the other hand, in the display device 1, a flange portion 53, which is an outer flange, is formed on the rear casing 50, and is fixed to the front chassis 20 together with the front casing 30. Since the accommodating portion 59 in which the internal structure is accommodated is provided with a flange portion 53 that is an outer flange instead of an inner flange, welding is not required. Conventional casings are formed by cutting, bending, and welding a single stainless steel plate, but the rear casing 50 and front casing 30 are formed by pressing a single rectangular stainless steel plate. Can be formed. Processing steps for stainless steel materials, which are hard and have poor workability, are reduced, improving productivity.

In addition, the front chassis 20 is placed in front of the front chassis 30, the front chassis 20 is provided with a boss 21, an insert nut is press-fitted into the boss hole, and the front chassis 30 and rear chassis 50 are attached to the front chassis 20. Because of the configuration in which they are tightened together, there is no need to perform tapping on the front casing 30 and the rear casing 50, which are made of hard stainless steel. There is no need to screw the chassis to the housing. By fastening the fixing member 60 to the insert nut 90, the front chassis 20, front housing 30, and rear housing 50 are fixed together, so there is no need to screw the chassis to the housing, and the fixing member Also, the screwing process of the fixing member is reduced, and productivity is improved.

It is necessary to provide a ground to the display 1 to prevent electrical leakage and affect measurement, but by press-fitting the cell spacer 32 into the front casing 30 made of stainless steel plate and tightening the grounding bolt 70, It is possible to easily bring the casings into contact with each other and provide a ground end portion exposed to the outside.

With the configuration in which the sealing groove formed between the front chassis 20 and the front housing 30 is filled with a sealing material, the waterproofness of the front chassis 20 and the front housing 30 is also ensured.

Since the front chassis 20 is disposed at the front, the front housing 30 can be made into a frame shape and the central opening 36 can be provided large. Conventional displays with housings made of stainless steel have small openings, and even if a wireless communication module is installed as an internal structure, radio waves are blocked by the stainless steel housing, resulting in poor reliability. Wireless communication with external devices was not possible because high-speed wireless communication was not possible. On the other hand, in the display device 1, the front housing 30 is provided with a large central opening 36, and the central opening 36 is disposed on the front surface of the accommodating portion 59. Since the front chassis 20 disposed in front of the accommodating portion 59 is made of resin, radio waves are not blocked much. Therefore, the wireless communication module (not shown) disposed within the housing portion 59 can wirelessly perform data communication with an external device without any problem.

In addition, in the conventional configuration, the chassis is fixed inside the housing, so when installing optional parts, it is necessary to loosen the screws that connect the front and rear housings and install them inside. there were. In the display device 1, since the rear chassis 80 is attached from the back side of the rear housing 50, optional parts can be attached to the rear chassis 80 without removing the housing. That is, when adding an optional part, the inside of the accommodating part 59 can be accessed by removing the screw 92 that fastens the lid 89, and the optional part can be attached and placed on the support part 87 of the rear chassis 80. Later, by screwing the lid 89 again with the screws 92, the opening of the rear chassis 80 can be closed. Optional parts can be added without removing the housing, and the openings are also sealed.

The preferred embodiments and modified examples of the present invention have been described above, but the above embodiments are only examples of the present invention, and these can be combined based on the knowledge of those skilled in the art. Within the scope of the present invention.

1 : Display device 20 : Front chassis 25 : Standing wall 27 : Inner peripheral part 30 : Front housing 31 : Insertion hole 36 : Center opening 37 : Inner peripheral wall 40 : Gasket 41 : Insertion hole 50 : Rear housing 51 : Insertion hole 53 : Flange part 59 : Accommodation part 60 : Fixing member 90 : Insert nut Gr1 : Seal groove Gr2 : Seal groove M : Seal material SC : Platform scale

Claims (2)

a rear casing having an accommodating portion that is open at the front and bulges out to the rear, and a flange portion provided around the opening of the accommodating portion;
a front casing that is provided with a central opening in the center and is disposed in front of the rear casing and is assembled to the rear casing;
a gasket that is an annular sealing material disposed between the front casing and the rear casing;
a front chassis disposed in front of the front casing;
Equipped with
A plurality of bosses are provided on the side edge of the back surface of the front chassis, and insert nuts are press-fitted into inner holes of the plurality of bosses,
The flange portions of the front casing and the rear casing are provided with insertion holes corresponding to the plurality of bosses, and a fixing member is inserted into the rear casing and the rear casing from the back surface of the rear casing. The insert nut is inserted through the insertion hole of the rear casing and fastened to the insert nut, and the front casing and the rear casing are fastened together to the front chassis with the gasket sandwiched therebetween.
A display device for a waterproof platform scale, which is characterized by: A standing wall protruding from the rear surface is provided around the rear surface of the front chassis on the inside at a predetermined distance from the side edge,
The central opening of the front casing is provided with an inner circumferential wall that protrudes from the back surface and is provided around the circumference,
When the front chassis is arranged in front of the front casing, the standing wall enters the central opening of the front casing, and the inner peripheral part of the standing wall is arranged in front of the accommodating part,
A sealing groove filled with a sealing material is formed by the inner circumferential wall of the front casing and the vertical wall of the front chassis.
The indicator for a waterproof platform scale according to claim 1.