Balance with double draft shield

Abstract

By opening / closing sliding doors of a double draft shield of a balance at the same time, the opening time of the sliding doors of the double draft shield is shortened, the amount of outside air flowing into the double draft shield is reduced, and repeatability in weighing is improved. A balance has a double draft shield consisting of an inner draft shield that covers a weighing pan and an outer draft shield that covers the inner draft shield, wherein each draft shield has sliding doors (13, 29) that can be opened / closed on the side surface and includes a pair of engaging members (41, 51) linked to move the sliding doors (13, 29) positioned on the same side surface side of each draft shield in the same direction, one of the engaging members (51) is provided with a protrusion (60), the other engaging member (41) is provided with a recess (43), the protrusion (60) may be inserted into and retracted from the recess (43), when the protrusion (60) is inserted in the recess (43), the pair of the engaging members (41, 51) is in the engagement state, and in this engagement state, the sliding doors (13, 29) can be linked and opened / closed at the same time.

Description

[Technical field]

[0001] The present invention relates to a balance, and more particularly to a balance equipped with a double draft shield suitable for a high-resolution balance. [Background technology]

[0002] Conventionally, balances are provided with a windshield to prevent air flow around the weighing pan, such as the wind from an air conditioner, the breath of a person while weighing, or the air flow generated when a person walks, from acting as wind pressure on the load-bearing part centered on the weighing pan and adversely affecting the weighing. The windshield usually has an opening for placing the sample to be weighed on the weighing pan, and a sliding door to open and close this opening. However, air flow also occurs when the sliding door is opened and closed. This air flow is attenuated as it moves inside the windshield after the sliding door is closed, but if it hits the weighing pan during this movement, it will have an adverse effect on the weighing, especially on the repeatability.

[0003] Conventionally, as a measure to prevent this air flow from reaching the weighing pan, a balance equipped with a double windbreak, in which an additional windbreak covering the weighing pan is provided within the windbreak, is known. However, with a double windbreak, sliding doors are provided on both the inner and outer windbreaks, so that the sliding doors must be opened and closed twice during weighing, once for the inner windbreak and once for the outer windbreak, resulting in poor operability. In particular, the sliding door of the inner windbreak must be opened and closed by reaching out from outside the outer windbreak, making it extremely difficult to operate.

[0004] To overcome this problem of poor operability, there is a balance (Patent Document 1) in which at least a portion of the periphery of the inner windshield, excluding the ceiling, is opened and closed by sliding vertically driven by a motor, and which is provided with a detection means for detecting the opening and closing of sliding doors that slide laterally on a pair of side surfaces of the outer windshield, and which is configured to open and close the inner windshield in conjunction with the opening and closing of the sliding doors of the outer windshield based on the detection results. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 4-113029 Summary of the Invention [Problem to be solved by the invention]

[0006] In the balance of Patent Document 1, the inner windshield is opened and closed by a motor when the sliding door of the outer windshield, which is opened and closed manually, is detected, and a rack and pinion gear for transmitting the driving force of the motor to the opening and closing part of the inner windshield is provided on the side wall of the inner windshield. Therefore, the balance of Patent Document 1 must have a driving force transmission mechanism including the rack and pinion gear provided inside the double windshield, which makes the structure complicated and increases the size of the windshield. In addition, the balance of Patent Document 1 has the disadvantage that dust may be generated from the mechanical contact part of the driving force transmission mechanism inside the double windshield when the motor is driven by the operation of the driving force transmission mechanism.

[0007] In addition, in the balance of Patent Document 1, the motor opens and closes the inner windshield after detecting that the sliding door of the outer windshield has been opened and closed. Therefore, when weighing, it is not necessary to manually open and close the inner windshield, but it is necessary to open and close the inner and outer windshields separately, that is, twice. Here, the amount of outside air flowing into the inner windshield via the outer windshield increases according to the length of time that the opening and closing parts of each windshield are open, and this increase in the amount of inflow of outside air has a negative effect on the repeatability, which is one of the indicators of weighing accuracy. In the balance of Patent Document 1, since the opening and closing operation is performed twice, the opening and closing time of each opening and closing part of the double windshield is the same as that of a double windshield in which the opening and closing parts are not linked. For this reason, although the balance of Patent Document 1 opens and closes the opening and closing parts of the double windshield in a linked manner, the amount of inflow of outside air cannot be reduced compared to when they are not linked, and there is also the inconvenience that the repeatability of weighing cannot be improved.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a balance with a double wind shield which overcomes these inconveniences. [Means for solving the problem]

[0009] In order to solve the above problems, the balance with double wind shield of the present invention has a double wind shield consisting of an inner wind shield covering the weighing pan and an outer wind shield covering the inner wind shield, and the inner and outer wind shields have sliding doors on the sides that can be opened and closed, and the sliding doors of the inner and outer wind shields are provided with a linking mechanism that links the sliding doors located on the same side so that they move in the same direction.

[0010] The sliding doors located on the same side of the inner and outer windshields are linked to move in the same direction, so that by opening or closing the sliding door of the outer windshield, the sliding door of the inner windshield can also be opened or closed at the same time.

[0011] In addition, the linkage mechanism may be constructed of a pair of engaging members that can be engaged and disengaged, with a protrusion on one engaging member and a recess on the other engaging member, and the recess and the protrusion may be displaced relative to each other so that the protrusion enters and exits the recess, with the protrusion being in an engaged state when inserted and the exit being in a disengaged state when inserted.

[0012] With this configuration, a pair of engaging members can be engaged and disengaged by the protrusion inserting and withdrawing into the recess, so that the inner and outer sliding doors can be opened and closed simultaneously, or opened and closed separately, depending on the engagement and disengagement of the pair of engaging members.

[0013] Furthermore, the engaging member having the protrusion may include a housing, and the protrusion may be provided so as to be capable of protruding and retracting into the housing, and may be provided so as to be positionable at two positions, a most protruding position and a most retracting position.

[0014] With this configuration, the displacement of the protrusion is ensured, and the protruding position in the engaged state and the thrust position in which the engaged state is released can be reliably achieved, so that the engagement and disengagement operation of the pair of engaging members can be performed reliably and easily.

[0015] Furthermore, the engaging member with the recess may have a riseable engaging lever with the recess at its tip and a return spring at its rear end, such that when the engaging lever is lowered, the protrusion enters the recess, while when the engaging lever is raised against the elastic force of the return spring, the protrusion withdraws from the recess.

[0016] With this configuration, when each engaging member is in an engaged state, the rear end of the engaging lever is pushed down against the elastic force of the return spring, and the tip is raised to disengage each engaging member from the engaged state, and the pushing down is released to return the engaging lever to a lying down state using the elastic force of the return spring, thereby engaging each engaging member, and disengaging operations can be performed reliably and easily. Effect of the Invention

[0017] According to the present invention, by linking the sliding doors located on the same side of the outer and inner windshields to move in the same direction, the sliding door of the inner windshield can be opened and closed simultaneously by opening and closing the sliding door of the outer windshield, which is easy to open and close, and therefore the sliding doors of the double windshield can be opened and closed easily. Also, since the sliding doors of the double windshield only need to be opened and closed once at the same time, the opening time of the sliding doors of the double windshield is shortened and the amount of outside air flowing into the double windshield is reduced, improving repeatability in weighing and enabling accurate weighing to be achieved, particularly in high-resolution balances. [Brief description of the drawings]

[0018] [Figure 1] 1 is an overall perspective view showing a first embodiment of the present invention with the front plate of an outer windshield omitted; [Diagram 2] FIG. [Diagram 3]FIG. [Figure 4] FIG. 4 is an enlarged side view showing the engagement state of the pair of engagement members. [Diagram 5] FIG. 13 is an exploded perspective view of the engaging member having a protrusion. [Figure 6] FIG. 11 is a plan view showing the inside of the housing, illustrating the protruding and recessing operation of the protrusion of the engagement member. [Figure 7] FIG. 11 is an overall perspective view showing a second embodiment of the present invention with the front plate of the outer windshield omitted. [Figure 8] FIG. 4 is an enlarged side view showing the engagement state of the pair of engagement members. [Figure 9] FIG. 11 is an enlarged perspective view showing a main part of a third embodiment of the present invention. [Figure 10] FIG. 4 is an enlarged cross-sectional view showing the engagement state of a pair of engagement members. [Figure 11] FIG. 11 is an enlarged plan view showing a state in which one of the engagement members is fixed to the sliding door of the inner windshield. [Figure 12] FIG. 13 is an enlarged perspective view showing a main part of a fourth embodiment of the present invention. [Figure 13] FIG. 4 is an enlarged perspective view showing the pair of engaging members in an engaged and disengaged state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A first embodiment of the present invention will now be described with reference to the accompanying drawings, FIGS. 1 to 6. As shown in Fig. 1, the balance 1 is equipped with a double windshield consisting of an outer windshield 11 and an inner windshield 21 covered by the outer windshield 11. As shown in Figs. 1 and 3, the inner windshield 21 is divided into upper and lower parts by a partition plate 22, with the upper part being a static elimination chamber 23 and the lower part being a weighing chamber 25 provided with a weighing dish 24 on which a sample is placed and which is connected to a mass sensor (not shown) such as an electromagnetic balance type or a load cell type in a casing 26. The inner windshield 21 and the outer windshield 11 prevent air flow entering the weighing chamber 25, such as the wind from an air conditioner, a person's breath during weighing, or air flow generated when a person walks, from acting as wind pressure on the load-bearing portion centered on the weighing dish 24 and affecting the weighing.

[0020] As shown in Figs. 1 and 2, the outer windshield 11 has a front plate 12 (not shown in Fig. 1), a pair of left and right sliding doors 13, 13 that open and close the sides, a top plate 14 that closes the top, and a back plate 15 that closes the back, and the bottom is open. A notch 16 is provided at the lower end of the front plate 12 so that the front side of a casing 26 on which a display unit 27 of the inner windshield 21 is provided is exposed. The upper and lower ends of each of the sliding doors 13, 13 fit into guide grooves 20 (only one of the lower support frames 18 is shown) provided in each pair of upper support frames 17, 17 and lower support frames 18, 18, respectively, and the sliding doors 13, 13 are guided and slid by these guide grooves 20. Also, a handle 19 is provided on the outer surface of each of the sliding doors 13, 13. The front plate 12, the pair of sliding doors 13, 13 and the top plate 14 are provided with a groove 20 (only one of the lower support frames 18 is shown) provided in each pair of upper support frames 17, 17 and lower support frames 18, 18, respectively, and the sliding doors 13, 13 are guided and slid by these grooves 20. board 14 is made of glass or resin, and is preferably transparent so that the internal state can be observed. In order to prevent the generation of static electricity, the glass is preferably conductive glass with a conductive film on the surface, and the resin is preferably conductive resin.

[0021] As shown in Figs. 1 and 3, the inner windshield 21 has a front plate 28, a pair of left and right sliding doors 29 (only one of which is shown) that open and close the side surfaces, a top door 30 provided with a knob 30a that opens and closes the top surface, and a back plate 32 that forms one surface of a box-shaped housing 31 that closes the back surface. The sliding door 29 has its upper and lower ends engaged with guide grooves 34 (only one side edge of the casing 26 is shown) provided on both side edges of the top surface of the casing 26 and each pair of upper support frames 33, 33, and slides while being guided by these guide grooves 34. The top door 30 slides while being guided by each of the upper support frames 33, 33. The front plate 28, the pair of sliding doors 29, and the top door 30 are made of glass or resin, and are preferably transparent so that the inside state can be observed. In order to prevent the generation of static electricity, the glass is preferably conductive glass with a conductive film on its surface, and the resin is preferably conductive resin having conductivity.

[0022] Here, we will explain the linking mechanism that links the sliding doors 13, 29 located on the same side of the outer windshield 11 and the inner windshield 21 so that they move in the same direction, but since the linking mechanisms on each side have the same configuration, only one side will be explained and the same reference numerals will be used to denote corresponding parts on the other side. As shown in Figures 1 to 3, the linking mechanism consists of a pair of engaging members 41, 51 that are provided on the inner side of the sliding door 13 and the outer side of the sliding door 29 and that engage detachably.

[0023] As can be seen from Fig. 4, the engaging member 41 provided on the sliding door 13 has a block-shaped main body 42 provided on the substantially rear side of the handle 19. A recess 43 having an oval planar shape is provided on the lower surface of the tip side (sliding door 29 side) of the main body 42. On the other hand, the engaging member 51 provided on the sliding door 29 is fixed to the mounting frame 35 of the sliding door 29 via a mounting member 36 so as to be positioned obliquely in the closing movement direction of the sliding door 29. The mounting member 36 is composed of a fixing base 36a for fixing the lower surface of the engaging member 51, and a bent plate 36b that is attached and fixed to the mounting frame 35 at one end edge of one surface formed by bending in two at an obtuse angle and that fixes the back surface of the engaging member 51 to the other surface.

[0024] As shown in Fig. 5, the engagement member 51 is composed of a housing body 52 with one open surface, a movable body 53 arranged inside the housing body 52 so as to be slidable in the longitudinal direction thereof, and a housing cover 54 having a U-shaped cross section fitted to the housing body 52 so as to close the open surface of the housing body 52. ​​The housing body 52 and the housing cover 54 constitute a housing. A pair of opposing side walls of the housing body 52 have semicircular cross-sectional grooves 55, 55 and 56, 56 formed at intervals in the longitudinal direction on the inner surfaces thereof. A circular hole 57 is provided in one side wall located at the longitudinal end of the housing body 52. ​​The housing cover 54 has a rectangular through hole 58.

[0025] The movable body 53 has a rectangular parallelepiped main body 59, and this main body 59 is provided with a cylindrical protrusion 60 and an operation knob 61. The movable body 53 is provided with a horizontal hole 62 that penetrates in the horizontal direction at a position corresponding to the operation knob 61, and a pair of positioning members 64, 64 having a semispherical tip and a cylindrical base, which are resiliently biased outwardly of the horizontal hole 62 by a coil spring 63, are disposed in this horizontal hole 62. The positioning members 64, 64 are resiliently contacted by the resilience of the coil spring 63 with the inner side wall of the housing main body 52, which has the recessed grooves 55, 55, 56, 56. The operation knob 61 protrudes from a through hole 58 of the housing cover 54, and the protrusion 60 protrudes from a circular hole 57 of the housing main body 52. ​​The main body 59 is provided with square holes 65, 66 that extend parallel to the horizontal hole 62 in order to reduce weight.

[0026] As shown in FIG. 6, the operating knob 61 is grasped and moved within the through hole 58 (see FIG. 4), whereby the movable body 5 3 The positioning members 64, 64 move within the housing body 52 while elastically contacting the inner side of the side wall of the housing body 52, and the protrusion 60 protrudes or enters through the circular hole 57 (see FIG. 5) depending on the direction of movement. During this movement, the state in FIG. 6(c) where the positioning members 64, 64 are engaged with the respective concave grooves 55, 55 is the most protruding position of the protrusion 60, and the state in FIG. 6(a) where the positioning members 64, 64 are engaged with the respective concave grooves 56, 56 is the most inserted position of the protrusion 60. At these two positions, the movable body 5 3 is positioned.

[0027] Therefore, with the sliding door 13 of the outer windshield 11 and the sliding door 29 of the inner windshield 21 both open, the pair of engaging members 41, 51 are positioned in correspondence with each other, and the operating knob 61 of the engaging member 51, which is in the state shown in Figure 6(a), is moved upward in Figure 4, and each positioning member 64, 64 is disengaged from each groove 56, 56. After passing through the state shown in Figure 6(b), the positioning members 64, 64 are engaged with each groove 55, 55, resulting in the state shown in Figure 6(c), in which the protrusion 60 protrudes most from within the housing body 52 and enters the recess 43 of the engaging member 41.

[0028] At this time, as shown in Fig. 4, the engaging member 51 is provided inclined in the closing movement direction with respect to the sliding door 29, so that the operation knob 61 can be easily and reliably moved by inserting a hand from the open surface of the outer windshield 11 to grasp the operating knob 61. Also, since the recess 43 has an elliptical planar shape, the pair of engaging members 41, 51 can be easily positioned when the protruding portion 60 is inserted. As a result, the pair of engaging members 41, 51 are in an engaged state, and when the sliding door 13 is opened or closed, the sliding door 29 also opens and closes in conjunction with the sliding door 13. Although this opening and closing operation is performed manually, one of the sliding doors 13, 29 may be configured to open and close automatically by linking it to an appropriate driving source such as an air cylinder.

[0029] 1, the weighing is performed by opening the sliding doors 13, 29 on one side of the outer windshield 11 and the inner windshield 21, for example, on the right side, placing a sample on the weighing dish 24 from the open side, and then closing the sliding door 13, which simultaneously closes the sliding door 29, closing the weighing chamber 25. During this weighing, the weighing chamber 25 is not affected by external influences because it is in a closed state.

[0030] When weighing a sample, there is a possibility that outside air will flow from the outer windshield 11 into the inner windshield 21 when opening and closing the sliding doors 13, 29 to place the sample on the weighing dish 24. However, the opening and closing time of the sliding doors 13, 29 is the same as that of a single sliding door, so it takes only a short time, and even if air does flow in, the amount of inflow is extremely small. Therefore, the weighing dish 24 on which the sample is placed is hardly affected by the air flow, and accurate weighing can be performed.

[0031] Next, a second embodiment of the present invention will be described with reference to the accompanying drawings, FIGS. As is clear from FIG. 7, the only difference between balance 10 of this embodiment and balance 1 of the first embodiment described above is the configuration of the linkage mechanism. Since the other configurations are the same, only the linkage mechanism will be described below. With regard to the other configurations, the same symbols are used for parts corresponding to those in the first embodiment, and descriptions thereof will be omitted.

[0032] As shown in Figs. 7 and 8, in this embodiment, the linking mechanism is formed by a part of the handles 71, 72 provided on each of the sliding doors 13, 29. The upper horizontal portion of the handle 71 of the sliding door 13 is one engagement member 73, and the upper horizontal portion of the handle 72 of the sliding door 29, which is located in a position corresponding to the engagement member 73, is the other engagement member 74. The engagement member 73 has the same configuration as the engagement member 51 of the first embodiment, and is configured by placing the engagement member 51 horizontally. It has an operation knob 75 and a protruding portion 76, and the protruding portion 76 protrudes and retracts in response to the movement of the operation knob 75, as in the first embodiment described above. In addition, the sliding door 13 is provided with a through hole 79 through which the protruding portion 76 is inserted when protruding and retracting, and the engagement member 74 is provided with a horizontal hole-shaped recess 78 through which the protruding portion 76 inserted through the through hole 79 in a block-shaped main body 77 protrudes and retracts.

[0033] FIG. 8 shows an engaged state in which the operation knob 75 is moved closest to the sliding door 13 (see FIG. 6(c)) and the protrusion 76 is in the most protruding position and protrudes into the recess 78. On the other hand, when the operation knob 75 is moved to the position farthest from the sliding door 13, the protrusion 76 protrudes from the recess 78 into the housing body (not shown) of the engagement member 73 and reaches the most protruding position (see FIG. 6(a)), disengaging from the engaged state. The other configurations and operations of the engagement members 73, 74 are the same as those in the first embodiment, and therefore a description thereof will be omitted. In this embodiment, the engagement member 73 having the protrusion 76 is provided on the handle 71 located on the outer surface of the sliding door 13 of the outer windshield 11, so that operation using the operation knob 75 is easy.

[0034] Next, a third embodiment of the present invention will be described with reference to the accompanying drawings, FIGS. The only difference between this embodiment and the first embodiment described above is the configuration of the linking mechanism and the configuration in which a handle 99 is provided on the sliding door 29. Therefore, only the linking mechanism will be described below. For other configurations, the same symbols will be used for parts corresponding to those in the first embodiment, and descriptions thereof will be omitted.

[0035] As shown in Fig. 9 and Fig. 10, in this embodiment, one engaging member 81 is provided at the upper part of one end side where the handle 19 of the sliding door 13 is provided, and the other engaging member 91 is provided at the upper part of one end side where the handle 99 of the sliding door 29 is provided, and these pair of engaging members 81, 91 constitute a linking mechanism. The engaging member 81 is composed of a rectangular fixed plate 82a fixed to the sliding door 13, a rectangular engaging plate 82c having a width smaller than that of the fixed plate 82a, which is positioned close to the sliding door 29 facing the fixed plate 82a and has a protruding portion 82b protruding toward the fixed plate 82a, and a trapezoidal upper connecting plate 82d and a lower connecting plate 82e connecting the fixed plate 82a and the engaging plate 82c. As can be seen in Fig. 10, the protruding portion 82b is a protrusion with a right-angled triangular cross section, and the surface in the opening movement direction of the sliding door 13 is a vertical engaging surface, and the surface in the closing movement direction of the sliding door 13 is an inclined guide surface.

[0036] As shown in Figs. 10 and 11, the other engagement member 91 has a support base 93 fixed to a fixed base 92 of approximately the same thickness as the engagement plate 82c, which is fixed to the mounting frame 35 of the sliding door 29, and an engagement lever 95 having a recess 94 at its tip 95a into which the protruding portion 82b enters and exits is supported by a shaft 96 so as to be movable up and down. The engagement lever 95 has a return spring 97 disposed between the fixed base 92 and a rear end 95b opposite to the recess 94. The lower part of the tip surface of the engagement lever 95 forms an inclined surface 95c following the inclined guide surface of the protruding portion 82b. When the rear end 95b of the engagement lever 95 is pressed down against the elastic force of the return spring 97, the tip 95a of the engagement lever 95 stands up, and when the pressing down is released, the engagement lever 95 returns to its original position by the elastic force of the return spring 97. The state shown in FIG. 10 in which the fixed base 92 and the engagement plate 82c are joined and the protrusion 82b is inserted into the recess 94 is the engaged state.

[0037] In the above configuration, when the sliding doors 13, 29 are moved so that the engagement plate 82c and the fixed base 92 approach each other, the inclined surface 95c of the engagement lever 95 comes into contact with the inclined guide surface of the protrusion 82b, and the engagement lever 95 moves while pushing up the tip of the engagement lever 95 against the elastic force of the return spring 97. Then, when the inclined surface 95c overcomes the inclined guide surface of the protrusion 82b, the protrusion 82b of the engagement plate 82c starts to protrude into the recess 94 of the engagement lever 95. Then, when the engagement lever 95 returns to its original position by the elastic force of the return spring 97, the vertical engagement surface of the protrusion 82b comes into contact with the inner surface of the tip side of the recess 94, and the engagement state is established in which the protrusion 82b protrudes into the recess 94. In this engaged state, when the sliding door 13 is moved in the opening direction (upward in Figure 10), the engagement plate 82c moves in the same direction, the engagement lever 95 moves in the same direction by the protrusion 82b, and the support base 93 and the fixed base 92 also move in the same direction, so that the sliding door 29 also moves in the opening direction, and the sliding doors 13, 29 are opened simultaneously.

[0038] On the other hand, when the sliding doors 13 and 29 are open and the sliding door 13 is moved in the closing direction (upward and downward in FIG. 10), the inclined guide surface of the protruding portion 82b comes into contact with the inner surface of the rear end side of the recessed portion 94 of the engaging lever 95. In this state, even if the sliding door 13 is further moved in the closing direction, the pushing force of the protruding portion 82b against the inner surface of the rear end side is not sufficiently transmitted. However, in this state, since the end surface of the engaging plate 82c is in contact with the end surface of the fixed base 92 and is engaged, the engaging plate 82c directly pushes the fixed base 92, so that the sliding door 29 and the sliding door 13 can be moved simultaneously in the same direction. As a result, the sliding doors 13 and 29 are in the closed state.

[0039] In this embodiment, if the shape of the protruding portion 82b is made cylindrical or prismatic, such as a hexagonal prism, instead of a right-angled triangular cross section, the sliding doors 13 and 29 can be reliably linked together even when the sliding door 13 moves in the closing direction without relying on the pushing force of the engaging plate 82c against the fixed base 92. In this case, the protruding portion 82b enters the recess 94 when the rear end 95 of the engaging lever 95 is pressed against the engaging plate 82c.b After the lever 95 is pressed down, it is necessary to release the pressed down lever and perform the up-and-down movement of the lever 95 with the shaft 96 as a fulcrum.

[0040] Next, a fourth embodiment of the present invention will be described with reference to the accompanying drawings, FIGS. The only difference between this embodiment and the first embodiment described above is the configuration of the linkage mechanism. Therefore, only the linkage mechanism will be described below. For other configurations, the same symbols will be used for parts corresponding to those in the first embodiment, and descriptions thereof will be omitted.

[0041] As shown in Fig. 12 and Fig. 13, in this embodiment, one engaging member 101 having a recess is provided on the back side of the portion where the handle 19 of the sliding door 13 is provided, and the other engaging member having a protrusion is configured by the handle 102 of the sliding door 29, and these pair of engaging members 101, 102 configure a linking mechanism. The engaging member 101 is a rectangular parallelepiped engaging body 101a made of silicone rubber fixed to the sliding door 13, and a slit 101b as a recess is provided in the engaging body 101a. The slit 101b has a width, depth, and length that allow the tip 102a constituting the protrusion of the handle 102, which is the engaging member, to enter. In addition, the lower end of the slit 101b is formed to be wider than the width of the tip 102a in order to facilitate the insertion of the tip 102a.

[0042] In the above configuration, when covering the inner windshield with the outer windshield, as shown in Fig. 13, slit 101b of engagement body 101a is positioned corresponding to tip 102a of handle 102, and engagement body 101a is moved downward to insert tip 102a from the lower end of slit 101b to establish an engaged state, and sliding door 13 and sliding door 29 are linked together as shown in Fig. 12. By opening and closing sliding door 13 in this linked state, sliding door 29 can be opened and closed simultaneously in conjunction with each other.

[0043] The present invention is not limited to the above-described embodiments. For example, instead of the engaging member 51 of the first embodiment, a feed screw mechanism consisting of a nut and a screw shaft is provided in the housing body 52, and the peripheral surface of the nut is fixed to the housing cover 54. Through hole 58, and by rotating this nut in a predetermined direction, the screw shaft reciprocates in the axial direction, protruding from the housing body 52 and entering and exiting the recess 43 of the engaging member 41. Also, engaging bodies may be provided on the sliding doors 13, 29 so that their side surfaces positioned perpendicular to the opening and closing direction come into contact with each other, and magnets may be provided on the contact surfaces of these engaging bodies to connect the sliding doors 13, 29 by magnetic force.

[0044] Furthermore, the configuration of the outer windshield 11 and the inner windshield 21 is not limited to the above. In addition, the linked sliding doors 13, 29 are not limited to a pair on the left and right, and may be only one on the same side. Also, the sliding doors 13, 29 to which the engaging members 41, 51, 73, 74, and 81, 91 are provided may be reversed. Furthermore, instead of the combination of the outer windshield 11 and the inner windshield 21 described above, a windshield having four side surfaces and a top surface that close the weighing dish 24 is provided inside the inner windshield 21, and at least one of the pair of side surfaces facing the pair of sliding doors 29 of the inner windshield 21 among the four side surfaces is formed as an openable / closable sliding door to form a double windshield, and the inner and outer sliding doors of the double windshield may be linked by the above-mentioned linking mechanism. That is, in this configuration, the inner windshield 21 is used as the outer windshield, and a new inner windshield is provided inside the inner windshield 21. [Explanation of symbols]

[0045] 1,10 Balance 11 Outer windshield 12 Front plate 13 Sliding door 14 Top plate 15 Back plate 19 Handle 20 Guide groove 21 Inner windshield 22 Partition 23 Static electricity removal room 24 Weighing dish 25 Weighing Room 26 Casing 28 Front plate 29 Sliding Door 30 Top door 32 Back plate 34 Guide groove 41 Engagement member 42 Main unit 43 Recess 51 Engagement member 52 Main unit 53 Mobile 54 Case cover 55,56 Groove 57 Round hole 58 Through hole 59 Main Body 60 Protrusion 61 Operation knob 62 Horizontal hole 63 Coil Spring 64 Positioning member 71,72 Handle 73, 74 Engagement member 75 Operation knob 76 Protrusion 78 Recess 81, 91 Engagement member 82a Fixed plate 82b Protrusion 82c Engagement plate 92 Fixed stand 93 Support stand 94 Recess 95 Engagement lever 97 Return spring 101 Engagement member 101a Engagement body 101b Slit 102 Handle 102a Tip

Claims

1. The weighing machine is provided with a double windshield consisting of an inner windshield covering the weighing dish and an outer windshield covering the inner windshield, The inner windshield and the outer windshield each have a slide door that can be opened and closed on a side surface, The sliding door of the inner windshield and the sliding door of the outer windshield are provided with a linking mechanism that links the sliding doors located on the same side so that they move in the same direction. A balance with double draft shield.

2. The linking mechanism includes a pair of engaging members that are releasably engaged with each other, One of the engagement members is provided with a protrusion, and the other engagement member is provided with a recess, The recess and the protrusion are configured to be displaced relative to each other so that the protrusion enters and exits the recess. A balance equipped with the double wind shield according to claim 1.

3. The engagement member having the protrusion includes a housing, The protrusion is provided so as to be capable of protruding and retracting into the housing and to be positionable at two positions, a most protruding position and a most retracting position. A balance equipped with the double wind shield according to claim 2.

4. The engagement member having the recess has a front end with the recess and a rear end with a return spring, the engagement lever being capable of rising and falling. The protrusion is configured to enter the recess when the engaging lever is in a lying position, and the protrusion is configured to retract from the recess when the engaging lever is in a standing position against the elastic force of the return spring. A balance equipped with the double wind shield according to claim 2.

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