Libra

Abstract

To provide a balance pedestal which facilitates installation work.SOLUTION: A balance pedestal includes: a rack with an upper frame; a cover assembly surrounding a periphery of the rack; and a weight assembly which is placed on the upper frame of the rack, and whose top face serves as a placement surface for placing a balance. The weight assembly includes: a weight housing part which is placed on the upper frame of the rack, and whose upper side is open; a plurality of weights housed in a stacked state in a vertical direction in the weight housing part; and a weight cover covering the plurality of weights from above. The cover assembly has a top plate. The top plate is provided with a through hole penetrating the top plate vertically, and the weight assembly supported by the rack is arranged inside the through hole. A top face of the top plate and a top face of the weight cover are located at substantially a same height position, and the top face of the weight cover is used to place the balance.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a balance stand that can be suitably used to place a precision measuring balance for weighing chemicals, samples, etc. used in, for example, chemical experiments. [Background technology]

[0002] A precision balance used to perform precise weighing in chemical experiments and the like is placed on a sturdy balance stand with sufficient weight (see, for example, Patent Document 1). The balance stand in Patent Document 1 includes a desk with a top plate with a hole in the center, and a balance support structure provided below the desk. The balance support structure includes a pair of leg blocks connected by a connecting rod, a support base placed on the leg blocks via a buffer material, and a balance base screwed to the support base. The balance base is slightly smaller than the hole in the desk top plate and does not contact the top plate. Furthermore, the desk and balance support structure are not connected. Therefore, even if the desk is vibrated, the vibrations are not transmitted to the balance support structure.

[0003] Each component of the balance support structure is quite heavy, making installation difficult. Once the balance support structure is installed at the installation location, it is not easy to fine-tune the position of a support structure with a total weight of, for example, more than 200 kg. Of course, changing the installation location requires a great deal of work. Furthermore, conventional balance platforms do not allow for flexible changes to the installation procedure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 53-138864 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a balance platform that can be easily installed. [Means for solving the problem]

[0006] According to one embodiment of the present invention, there is provided a balance stand comprising: a stand having an upper frame; a cover assembly surrounding the periphery of the stand; and a weight assembly placed on the upper frame of the stand, the upper surface of which serves as a support surface for placing a balance. The weight assembly is placed on the upper frame of the stand and has a weight storage section with an open top, a plurality of weights stored in the weight storage section in a vertically stacked state, and a weight cover that covers the plurality of weights from above. The cover assembly has a top plate, which is provided with a through hole that passes through the top plate from top to bottom, and the weight assembly supported by the stand is positioned inside the through hole. The top surface of the top plate and the top surface of the weight cover are at approximately the same height, and the top surface of the weight cover is used to place a balance. [Effects of the Invention]

[0007] According to the embodiment of the present invention, the installation work of the balance platform can be easily performed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a balance platform according to an embodiment of the present invention. [Figure 2] 2 is a perspective view showing a frame, which is a component of the balance table of FIG. 1. FIG. [Figure 3] FIG. 3 is a perspective view showing a state in which a rubber plate is attached to the frame body of FIG. 2. [Figure 4] 4 is a perspective view showing a state in which a weight support portion and a weight are attached to the frame body of FIG. 3. FIG. [Figure 5] 5 is a perspective view showing a state in which a weight cover is attached to the weight support portion shown in FIG. 4. FIG. [Figure 6] FIG. 2 is a perspective view showing components of a weight assembly. [Figure 7] FIG. 10 is a perspective view showing the panel legs and upper beams of the cover assembly. [Figure 8] FIG. 2 is a perspective view showing a side cover and a rear panel of the cover assembly. [Figure 9] FIG. 10 is a perspective view illustrating a process of joining a pair of panel legs via an upper beam. [Figure 10] FIG. 10 is a perspective view illustrating a step of further joining a rear panel to the panel legs in the state shown in FIG. 9. [Figure 11] 11 is a perspective view illustrating a step of further joining a top plate to the panel legs, upper beams, and rear panel in the state shown in FIG. 10. FIG. [Figure 12] FIG. 10 is a perspective view showing the state in which the cover assembly is placed over the base / weight assembly. [Figure 13] FIG. 2 is a plan view showing the balance platform as viewed from directly above. [Figure 14] FIG. 10 is a plan view showing the balance platform with the top plate removed as viewed from directly above. [Figure 15] FIG. 2 is a perspective view showing the balance platform from which the top plate and rear panel have been removed, viewed obliquely from above and behind. [Figure 16] FIG. 10 is a perspective view illustrating a first modified embodiment of a method for installing a balance platform. DETAILED DESCRIPTION OF THE INVENTION

[0009] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a balance platform 1 is composed of (roughly classifying its components) a base 10, a weight assembly 20, and a cover assembly 30. The balance platform 1 is of an on-site assembly type. In the following, the configuration of the balance platform 1 will be described in parallel with the installation procedure at the installation site.

[0010] To simplify the explanation of directions and positions, the front side as seen from an operator sitting facing the balance platform 1 after installation of the balance platform 1 is completed will be referred to as the "front," the back side as the "rear," the left-hand side as the "left," and the right-hand side as the "right," as necessary. Note that the illustrated balance platform 1 has a substantially mirror-symmetrical configuration, so even if the left side is not visible in the illustration, for example, the configuration of the invisible left side can be understood by looking at the right side.

[0011] In this specification, the term "mounting system" refers to a general mounting system, i.e., a structure for supporting a heavy load formed by connecting multiple beams and columns. As shown in Fig. 2, the mounting system 10 has six beams (structural elements extending horizontally) and four columns (structural elements extending vertically). The mounting system 10 is made by welding steel square pipes.

[0012] The frame 10 has an upper frame 11 at its upper end, which is generally rectangular overall and is made up of four beams (two long beams 12 and two short beams 13). Three rubber plate mounting holes 14 are formed in each long beam 12 of the upper frame 11.

[0013] Screw-in adjusters 16 are detachably attached to the undersides of the front and rear ends of the two lower beams 15 that make up the base 10 in order to adjust the level of the base 10. Of course, these adjusters 16 may also be assembled to the base 10 at the installation site.

[0014] First, the platform 10 is placed at a position on the floor that corresponds to the target installation position of the balance platform 1.

[0015] 3, a rubber plate 17 serving as a vibration-damping member is attached to the upper frame 11 of the mount 10. The rubber plate 17 can be attached to the upper frame 11 by fitting a cylindrical protrusion (not shown) provided on the bottom surface of the rubber plate 17 into the rubber plate attachment hole 14. Instead of the rubber plate 17, a suitable structure or elastomer having vibration-damping properties (vibration-damping properties) may be used.

[0016] Next, as shown in Figures 4 and 5, the weight assembly 20 is mounted on the stand 10. As also shown in Figure 6, the weight assembly 20 is composed of a weight storage section 21, a plurality of weights 22, and a weight cover 23. The weight storage section 21 and the weight cover 23 as a whole have a shape similar to a box with a lid. Note that in Figure 6, the weight storage section 21, the weight 22, and the weight cover 23 are all drawn as seen from different perspectives to make it easier to understand the structure of each of the members 21, 22, and 23.

[0017] When mounting the weight assembly 20 on the stand 10, first, as shown in Figure 4, the weight storage section 21 (corresponding to the lower part of a box with a lid) is placed on the rubber plate 17 attached to the stand 10. At this time, the positioning protrusions 214 (only two of six are visible) protruding from the underside of the bottom plate 211 of the weight storage section 21 are fitted into the recesses provided on the upper surface of the rubber plate 17.

[0018] The weight storage section 21 has the rectangular bottom plate 211 described above and three side plates 212 extending upward from the edges corresponding to three sides of the rectangle. No side plate (212) is provided at the edge (front edge) corresponding to the remaining side of the rectangle. This configuration makes it easy to store and remove the weights 22 from the weight storage section 21.

[0019] In this specification, the term "rectangle" is used to include "square" unless there is a clear statement that the lengths of the long and short sides are necessarily different (or similar).

[0020] Next, the weights 22 are placed one by one on top of the bottom plate 211 of the weight storage section 21. The weights 22 are rectangular iron plates weighing a weight that can be handled comfortably by an adult worker, for example, about 20 to 25 kg per plate. The total weight of the weight assembly 20 is, for example, within the range of about 110 to 140 kg. The number of weights 22 can be set within the range of, for example, 4 to 5. The number of weights 22 and the weight per weight can be appropriately selected within a range that is not so large that stacking becomes cumbersome, but is not so heavy that the work becomes difficult, and is not limited to the above.

[0021] When placing the weights 22 in the weight storage section 21, the rear side plate 212 of the weight storage section 21 can be used as a positioning member for the weights 22. In other words, by lightly hitting the edge of the weight 22 against the rear side plate 212 of the weight storage section 21, it becomes easy to align the position of the weights 22.

[0022] When the weight 22 is stored in the weight storage section 21, a gap large enough to allow a finger to be inserted may be formed between the edge of the weight 22 and the side plate 212 (for example, the side plate 212 on the right side as seen from the operator) of the weight storage section 21. This makes it even easier to store and remove the weight 22 in and from the weight storage section 21.

[0023] Once a predetermined number of weights 22 have been stacked, the weight cover 23 is placed over the weights 22 and the weight storage section 21, as shown in Fig. 5. The weight cover 23 has a rectangular top plate 231 that is slightly larger than the weights 22 in a plan view, and four side plates 232 that extend downward from the edges of the top plate 231 that correspond to the four sides (all sides) of the rectangle.

[0024] When the weight cover 23 is placed on the weight storage section 21 with a predetermined number of weights 22 loaded inside, the upper surface of the top weight 22 and the lower surface of the top plate 231 of the weight cover 23 come into surface contact with each other, while the upper edge of the side plate 212 of the weight storage section 21 does not come into contact with the lower surface of the top plate 231 of the weight cover 23. In other words, the height position of the upper edge of each side plate 212 of the weight storage section 21 is lower than the height position of the upper surface of the top weight 22. This makes it possible to prevent bending vibration from occurring in the top plate 231 of the weight cover 23. For this reason, it is desirable that at least the upper surface (and preferably the lower surface) of the bottom plate 221 of the weight storage section 21, the upper and lower surfaces of each weight 22, and the upper and lower surfaces of the top plate 231 of the weight cover 23 have a sufficiently high degree of flatness to prevent rattles from occurring between the contacting surfaces.

[0025] As shown in FIG. 5, downward extensions 232e are provided on the left and right side plates 232 of the weight cover 23, and each downward extension 232e is provided with a hole 233 for inserting a screw (only the left one is visible in FIG. 5). As shown in FIG. 4, the left and right side plates 212 of the weight storage compartment 21 are also provided with holes 213 for inserting screws at positions corresponding to the holes 233. The weight cover 23 can be fixed to the weight storage compartment 21 by screwing tapping screws 50 into these holes 213, 233. This completes the weight assembly 20. When the weight assembly 20 is viewed from directly above in this state, the weight storage compartment 21 and the weight 22 are completely hidden by the weight cover 23 and cannot be seen.

[0026] Through the above procedure, a base / weight assembly (10+20) which is a first assembly consisting of the base 10 with the adjuster 16, the rubber plate 17 and the weight assembly 20 is formed.

[0027] Next, the second assembly, the cover assembly 30, is assembled. The cover assembly 30 includes a pair of left and right panel legs 31, an upper beam 32, a back panel 33, a top plate 34, and a pair of left and right side covers 35. The procedure for assembling the cover assembly 30 will be described below.

[0028] Before describing the assembly procedure for the cover assembly 30, the holes (holes through which the tapping screws are passed) formed in the panel leg 31 and the upper beam 32 will be described with reference to Figures 7 and 8. The panel leg 31 shown in Figure 7 is the left panel leg, and the side cover 35 shown in Figure 8 is the right side cover. The holes are designated with a reference code H and a two-digit number following the H. The two-digit number is the reference code of the component to which they are joined. For example, the hole designated with reference code H33 in the panel leg 31 is a hole used to join the panel leg 31 to the back panel 33.

[0029] In this embodiment, the insertion direction of all tapping screws is the thickness direction of the plate-like body in which the holes through which the tapping screws are inserted are formed. Tapping screws are not shown in the drawings that explain the assembly of the cover assembly 30.

[0030] The hole designated by reference symbol BH34 in FIG. 7 is a hole for passing a driver bit to turn the tapping screw inserted into hole H34. Also, the hole designated by reference symbol H31' formed in the side cover 35 in FIG. 8 is a potbellied hole. This potbellied hole H31' is used to catch the head of a tapping screw that has not been fully tightened into hole H35' in the panel leg 31 and is floating. After inserting the head of the tapping screw into the large diameter part of potbellied hole H31', the side cover 35 can be positioned relative to the panel leg 31 by lifting up the side cover 35.

[0031] Screw-in adjusters 36 (see, for example, Figure 9) for adjusting the level and height of the top plate 34 are detachably attached to the bottom of the pair of left and right panel legs 31. Of course, these adjusters 36 may be attached to the panel legs 31 at the installation site. Because the cover assembly 30 is relatively lightweight, the adjusters 36 can be attached at any time during the assembly of the cover assembly 30.

[0032] First, as shown in Figure 9, tapping screws are used to connect the left and right ends of the upper beam 32 to the left and right panel legs 31, which already have the adjusters 36 attached. At this time, holes H31 in the upper beam 32 and H32 in the panel legs 31 are used.

[0033] Next, as shown in Figure 10, the rear panel 33 is fixed to both panel legs 31 using tapping screws. At this time, holes H31 in the rear panel 33 and holes H33 in the panel legs 31 are used. The rear panel 33 is rectangular overall, with the edges of its four sides folded forward (towards the viewer when the balance platform 1 is completed), and the aforementioned holes H31 are provided in the left and right folded portions 331 (see also Figure 8). In addition, hole H34 is provided in the upper folded portion 332.

[0034] Next, as shown in Figure 11, tapping screws are used to join the top plate 34 to the pair of left and right panel legs 31, the upper beam 32, and the rear panel 33. At this time, holes H34 (see also Figures 7 and 8) are made in the panel legs 31, the upper beam 32, and the rear panel 33. Holes (not shown) for inserting tapping screws are formed in the underside of the edge portions of the four sides of the top plate 34 at positions corresponding to the holes H34.

[0035] As can be seen from the fact that bent portion 331 of rear panel 33 is visible in Figure 10, bent portion 331 is superimposed on the surface (side surface) of panel leg 31. Similarly, as can be seen from the fact that bent portion 332 of rear panel 33 is visible in Figure 10, bent portion 332 is superimposed on the surface (bottom surface) of top plate 34. As is clear from this, the joining of rear panel 33 to both panel legs 31 and the joining of top plate 34 to rear panel 33 using tapping screws can be performed by an operator crawling under top plate 34 after all parts of the second assembly other than rear panel 33 have been assembled.

[0036] The top plate 34 is a rectangular plate-like body. The top plate 34 is made of a material used for the top plates of general laboratory benches, such as a melamine decorative board. A rectangular through-hole 341 is formed in the center of the top plate 34, and the through-hole 341 has roughly the same shape as the weight assembly 20 in a plan view but is slightly larger than the weight assembly 20.

[0037] The cover assembly 30 (excluding the side covers 35) can be fabricated using the above procedure. The cover assembly 30 is relatively lightweight and can be easily lifted and carried by one or two adults. The cover assembly 30 is moved to the stand / weight assembly (10+20) and lifted directly above the stand / weight assembly (10+20), and then the cover assembly 30 is lowered onto the floor so that the weight assembly 20 fits into the through-hole 341 in the top plate 34. This results in the state shown in Figure 12.

[0038] Next, the side cover 35 is attached to the front ends of both panel legs 31 using tapping screws. At this time, holes H35, H35' formed in the panel leg 31 and holes H31, H31' formed in the side cover 35 are used. First, the head of the tapping screw inserted into hole H31' in the side cover 35 is passed through hole (potbelly hole) H35' in the side cover 35 (the use of holes H31' and H35' is as described above), and the side cover 35 is positioned relative to the panel legs 31. Next, the panel legs 31 and the side cover 35 are firmly joined together using the tapping screws inserted into holes H31, H35. The side cover 35 has notches into which the upper beam 32 is inserted.

[0039] Finally, adjust the adjusters 36 of the panel legs 31 so that the top surface of the top plate 34 is flush with the top surface of the weight assembly 20 (i.e., the top surface of the top plate 231 of the weight cover 23). This completes the installation of the balance platform 1. This state is shown in Figure 1. An appropriate precision balance or the like can be placed on top of the weight assembly 20 (on top of the top plate 231 of the weight cover 23) and used.

[0040] When the completed balance platform 1 is viewed from directly above, as shown in FIG. 13, there is a gap G of approximately 5 mm between the four edges of the through-hole 341 in the top plate 34 and the four edges of the weight assembly 20. To make the gap G easier to see, all components of the balance platform 1 are blacked out. This gap G is provided to separate the base 10 on which the balance is placed and the weight assembly 20 from the cover assembly 30 to insulate (block) vibrations. In other words, even if the top plate 34 of the cover assembly 30 is accidentally struck or the side cover 35 is accidentally hit, the resulting vibrations are not transmitted to the weight assembly 20. In other words, it is impossible to reduce the gap G to zero. Of course, there is no contact between the base 10, weight assembly 20, and cover assembly 30 at any point.

[0041] An object to be weighed by the balance (for example, fine powder or particles) may get into this gap G. If the object to be weighed is, for example, harmful (for example, a toxic substance or a substance that corrodes the pedestal 10), it must be removed.

[0042] Figure 14 shows the balance platform 1 from directly above with only the top plate 34 removed. As is clear from Figures 13 and 14, the components of the balance platform 1 that exist directly below the gap G are only a small portion (four locations) of the long beams 12 of the upper frame 11 of the base 10. In other words, except when a substance falls onto the top surface of the long beams 12, any substance that enters the gap G will fall directly to the floor.

[0043] Furthermore, the upper surface of the long beam 12 directly below the gap G is easily accessible. FIG. 15 is a perspective view of the balance platform 1 with the top plate 34 and rear panel 33 removed, viewed from diagonally above the rear. As shown in FIG. 15, there is a height difference Δh between the underside of the top plate 34 (i.e., the upper surface of the panel leg 31) and the upper surface of the long beam 12. Δh is, for example, approximately 4 cm. Also, as shown in FIG. 14, there is a gap W between the side of the weight assembly 20 and the short beam 13 of the upper frame 11 of the platform 10. W is, for example, approximately 5.5 cm. There is a gap DR between the rear panel 33 and the long beam 12. DR is, for example, approximately 7.5 cm. There is a gap DF between the upper beam 32 and the long beam 12. DF is, for example, approximately 7.5 cm. By appropriately setting the various dimensions Δh, W, DR, and DF, any object that falls on the upper surface of the long beam 12 directly below the gap G can be wiped up with a rag or the like held by hand. The entry path for inserting a hand is indicated by the thick arrow in Figure 14. It is not necessary to make all of the dimensions Δh, W, DR, and DF large; it is sufficient that each location (there are four locations) on the top surface of the long beam 12 directly below the gap G can be accessed with a rag or similar object held by hand. For example, DR and DF are relatively small, so a hand is sufficient. This is because the distance DC between the two long beams 12 is, for example, about 35 cm, making it possible to insert a hand through the gap between the two long beams 12. In the case of the structure shown in Figure 14, if Δh is at least 3 cm and W is at least 10 cm, it is considered possible to remove material that has fallen onto the top surface of the long beam 12 through the gap G with a rag or similar object held by hand.

[0044] Next, we will explain a first modified embodiment of the installation method for the balance platform 1. Note that the embodiment of the installation method explained so far will also be called the "main embodiment" for the sole purpose of distinguishing it from the modified embodiment.

[0045] In this first modified embodiment, the base / weight assembly (10+20) is assembled in the same manner as in the main embodiment, but the assembly procedure for the cover assembly 30 is different.

[0046] Of the components of the cover assembly 30, only the pair of left and right panel legs 31 (with adjusters 36 attached), the upper beam 32, and the side cover 35 are joined with tapping screws to create a preliminary assembly (31+32+35). Next, as shown in Figure 16, this preliminary assembly is placed on the floor in front of the stand / weight assembly (10+20) and is then slid toward the stand assembly. In other words, the stand / weight assembly is inserted relatively between the pair of left and right panel legs 31. At this time, the preliminary assembly (31+32+35) should be lifted just enough to prevent it from scraping against the floor. If the floor surface is properly protected, the preliminary assembly (31+32+35) can also be dragged without being lifted.

[0047] Once the positional relationship between the base / weight assembly (10+20) and the preliminary assembly (31+32+35) is the same as that of the completed balance platform 1, the back panel 33 and top plate 34 are attached to the preliminary assembly using self-tapping screws. This completes the installation of the balance platform 1. It is clear from the structure of the balance platform 1 described in the main embodiment that the self-tapping screws can be tightened by an operator crawling under the weight assembly 20. This first variant of the installation method can also be performed by a single adult operator in some cases.

[0048] Next, a second modified embodiment of the method for installing the balance platform 1 will be described. All parts of the platform / weight assembly (10+20) are assembled in advance except for the weight 22 and weight cover 23. Next, the cover assembly 30 is assembled using the method based on the main embodiment. The side cover 35 may be incorporated into the cover assembly 30 at this stage, or it may be attached last, but attaching it last makes the work easier.

[0049] Next, as in the main embodiment, the cover assembly 30 is lifted and lowered to the floor so that the weight storage section 21 of the stand / weight assembly (10+20) is aligned with the through-hole 341 of the top plate 34.

[0050] In this state, weights 22 are placed one by one in the weight storage compartment 21 through the through-holes 341 in the top plate 34. Then, the weight covers 23 are placed on the weights 22 and secured to the weight storage compartment 21 using tapping screws 50 (see FIG. 5). This completes the installation of the balance platform 1. To enable this securing operation, holes 233 formed in the downward extensions 232e of the side plates 232 of the weight covers 23 are located at a height between the underside of the top plate 34 and the upper surface of the long beam 12 of the frame 10, with a height difference of, for example, about 4 cm. If the gap W (see FIG. 14) is, for example, about 55 cm (or more), the tapping screws inserted into the holes 233 can be turned with a short-shaft screwdriver without removing the top plate 34.

[0051] According to this second modified embodiment, the heavy weight 22 is not placed on the balance platform 1 until immediately before the installation is completed, and therefore fine adjustment of the installation position of the balance platform 1 can be easily performed at any time after the weight 22 is placed. In this second modified embodiment, a preliminary assembly similar to that of the first modified embodiment may be prepared, and after the preliminary assembly is positioned relative to the stand assembly (without the weight 22 attached), the back panel 33 and the top plate 34 may be attached to the preliminary assembly. Then, after the top plate 34 is attached, the weight 22 and the weight cover 23 may be attached.

[0052] As a further modification of the second modified embodiment, the top plate 34 may be attached last after the weight 22 and the weight cover 23 are attached. This facilitates the work of placing the weight 22 and the work of fixing the weight cover 23. However, this requires that the work of attaching the top plate 34 be done in a somewhat narrow working space (the space below the weight 22).

[0053] The shapes of the weight storage section 21 and the weight cover 23 shown in Figure 6 are currently considered to be the most suitable, but are not limited to these. Instead of providing the weight storage section 21 with side plates 212, for example, one or more protrusions rising from the bottom plate 211 may be provided as positioning members for the weights 22. The protrusions can be provided by press working. Alternatively, the protrusions can be provided by welding small columnar blocks to the bottom plate 211. Note that the left and right side plates 212 are also used to connect the weight storage section 21 and the weight cover 23, so if the side plates 212 are eliminated, the weight cover 23 will be connected to the bottom plate 211 of the weight storage section 21. For example, the lower ends of the left and right side plates 232 of the weight cover 23 may be folded horizontally so that they face each other, and the weight storage section 21 and the weight cover 23 may be joined with tapping screws in the area where this folded portion makes surface contact with the bottom plate 211 of the weight storage section 21.

[0054] 6, the weight storage section 21 and weight cover 23 may be configured such that the weight storage section 21 is maintained in its original shape, the lower ends of the left and right side plates 232 of the weight cover 23 are folded back horizontally so as to face each other, and the weight storage section 21 and the weight cover 23 are joined with tapping screws in the area where these folded portions make surface contact with the bottom plate 211 of the weight storage section 21. In this case, at least the left and right side plates 232 of the weight cover 23 are passed through the gaps between the left and right side plates 212 of the weight storage section 21 and the outer edges of the weights 22, and the folded back portions of the lower ends come into surface contact with the bottom plate 211 of the weight storage section 21. The weight storage section 21 and the weight cover 23 are then joined with tapping screws in the area where they make surface contact. According to this configuration, the tapping screws that connect the weight storage section 21 and the weight cover 23 can be screwed in from below the bottom plate 211 of the weight storage section 21, so that when the weight cover 23 is attached at the end of the assembly process, the screw tightening work can be easily performed.

[0055] According to the various embodiments described so far, the weight is divided into multiple parts, which makes it easy to mount the weight on the stand and also increases the freedom of timing for mounting the weight on the stand.

[0056] Furthermore, according to the above embodiment, it is clear that the procedure for installing the balance platform can be flexibly changed. [Explanation of symbols]

[0057] 10 Mounting stand 11 Upper frame 17 Vibration control material (rubber plate) 20 Weight assembly 21 Weight storage section 22 weight 23 Weight cover 30 Cover assembly 34 Top plate

Claims

1. a frame having an upper frame; a cover assembly surrounding the periphery of the frame; a weight assembly that is placed on the upper frame of the frame and has an upper surface that serves as a support surface for placing a balance; Equipped with The weight assembly includes: a weight storage section placed on the upper frame of the frame and having an open top; A plurality of weights stored in the weight storage section in a stacked state in the vertical direction; a weight cover that covers the plurality of weights from above; and The cover assembly has a top plate, the top plate has a through hole that passes through the top plate from top to bottom, a weight assembly supported by the stand is placed inside the through hole, the top surface of the top plate and the top surface of the weight cover are at approximately the same height, and the top surface of the weight cover is used to place a balance on it.

2. 2. The balance platform according to claim 1, wherein the weight storage section is placed on the upper frame of the platform via a vibration-damping member.

3. 2. The balance platform according to claim 1, wherein the weight storage section has a bottom plate on which the stacked weights are placed, and a positioning member that positions the weights horizontally relative to the weight storage section.

4. 4. The balance platform of claim 3, wherein the weight storage section is a rectangular structure in a plan view, has three side panels rising from the edges of the bottom panel corresponding to three sides of the rectangle, and has no side panel rising from the remaining side, and at least one of the three side panels is used as the positioning member.

5. the weight storage section is a rectangular structure in a plan view, having a bottom plate on which the stacked weights are placed and a plurality of side plates extending upward from a periphery of the bottom plate, The weight cover is a rectangular structure in a plan view, having a top plate that is in surface contact with the uppermost weight of the plurality of weights and four side plates that extend downward from the periphery of the top plate, 2. The balance platform according to claim 1, wherein the top plate and the four side plates of the weight cover cover the weight storage section and the plurality of weights placed therein, and the weight storage section and the plurality of weights placed therein are completely hidden by the weight cover in a plan view.

6. 6. The balance platform according to claim 5, wherein, in plan view, there is a gap between each side plate of the weight cover and the edge of the through hole in the top plate, and no other components constituting the balance platform are present directly below this gap other than the components constituting the upper frame of the base.

7. 7. The balance platform according to claim 6, wherein the platform and the cover assembly are configured so that an operator can insert his or her hand into a portion of the upper frame of the platform directly below the gap.

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