WO2014034611A1

WO2014034611A1 - Wind blocking device for scale

Info

Publication number: WO2014034611A1
Application number: PCT/JP2013/072748
Authority: WO
Inventors: 智武吉田; 弘須澤; 和文内藤
Original assignee: 新光電子株式会社
Priority date: 2012-08-31
Filing date: 2013-08-26
Publication date: 2014-03-06
Also published as: JPWO2014034611A1; CN204807184U; JP6203180B2

Abstract

Provided is a wind blocking device that is mounted on a scale unit via a shield plate (12) that is fixed to the scale unit. The wind blocking device has the following: a frame-shaped base frame (21); a rear frame (22); a guide frame (23); a front panel (24) coupled with the end of a guide part; a slidable top panel (25); and side panels (26, 27). Disposed in front of the rear frame is an inner panel (28) that can be drawn upwards after removing the top panel. When mounting the wind blocking device, a claw provided to the frame-shaped base frame engages with a notch hole (121) in the shield plate, and a claw of a latch (40) engages with a notch hole (122) in the shield plate. Removal of the wind shield device is straightforward and detachment of the inner panel, side panel, and top panel which form the weighing space is simple, and therefore, cleaning can be easily performed.

Description

Windshield device for scale

The present invention relates to a windshield device for a scale, and is configured so that it can be easily attached to and detached from the scale body and cleaned.

A precision balance such as an electronic balance can affect the measurement accuracy even if the air in the room where it is installed moves slightly. Therefore, as described in Patent Document 1 below, a windshield case is installed so as to surround a weighing pan on which a sample is placed, and the flow of air is conventionally blocked.
In recent years, there are an increasing number of objects to be weighed that require high weighing accuracy, including chemical materials and drugs. In addition, there are a wide range of weighing locations, from quiet laboratories to manufacturing sites where air flow is not constant, and measurement is performed in an environment where a windshield device is indispensable for maintaining the accuracy of the electronic balance. Increasing cases are being reported.

JP 2003-130721 A

The inside of the windshield device may become dirty with an object to be weighed. In such a case, the inside of the windshield device needs to be cleaned.
However, the windshield device of Patent Document 1 is a structure in which posts are installed at the four corners of the lower base frame, the side plates are fitted into the fitting grooves of each post, and the upper base frame is fixed to the upper end of the post. There is a problem that the inside cannot be easily cleaned.

The present invention was devised in view of such circumstances, and an object of the present invention is to provide a windshield device for a scale that is easy to attach and detach to and from the balance body and enables high-precision weighing of the scale body. It is said.

The present invention is such that the support shaft supporting the weighing pan protrudes from the upper surface, and a square shield plate fixed to the upper surface covers the entire upper surface except the periphery of the support shaft via the shield plate A frame-shaped base frame that is resin-molded into a quadrangular shape corresponding to the outer periphery of the shield plate, and a metal made upright on the rear side (rear side) of the frame-shaped base frame A rear frame, a base portion fixed to the upper end of the rear frame, and a pair of guide portions extending forward from both ends of the base portion, the base portion and the guide portion integrally molded with resin, and a guide frame The front edge of the guide part is fixed, and the front edge of the frame-like base frame (front side) is transparent and the lower edge is locked, and the guide frame can be slid in the front-rear direction. Support Transparent left and right side panels that are slidably supported in the front-rear direction between the guide portions of the guide frame and the left and right sides (side sides) of the frame-shaped base frame The shield plate has a notch hole on each of the rising edges of the opposing sides, and a claw that engages with each of the notch holes from the outside is provided on the windshield device side. To do.
The windshield device can be removed from the scale body by releasing the engagement between the notch hole of the shield plate and the claw when cleaning the inside of the weighing pan or the windshield device. In addition, since the top panel and the side panels on both sides can be slid and removed, it is easy to clean the inside of the weighing pan and the windshield device with the windshield device mounted on the scale body.

Further, the windshield device for a scale according to the present invention has a notch hole formed in the rising edge of the front side and the rising edge of the rear side of the shield plate, and the cutout hole formed in the rising edge of the front side of the shield plate. Claws to be joined are provided inwardly on the back side of the front side of the frame-shaped base frame, and claws that engage with a notch formed in the rising edge of the rear side of the shield plate are on the outer surface of the rear frame. The latch is provided with a base part fixed to the rear frame, a pivot part supported by the base part so as to be pivotable in a horizontal direction via a hinge part, A shield holding portion extending downward from the lower edge; a claw provided on the shield holding portion; and a snap portion for locking the turning portion rotated to a position overlapping with the base portion. Claw of shield holding part while locked to snap part , Characterized in that it engages in the notch hole formed on the rising edge of the rear side of the shield plate.
This windshield device engages a claw with a notch hole formed in the rising edge of the front side of the shield plate, and then latches the rotating part of the latch fixed to the rear frame with the snap part. The claw engages with a notch hole formed in the rising edge of the rear side of the shield plate, and is attached to the scale body. Therefore, the windshield device can be attached to and detached from the balance body with one touch.

Moreover, in the windshield device for scales of this invention, it is desirable to shape | mold so that a nail | claw may increase in thickness, so that it separates from the front-end | tip of a nail | claw.
By doing so, there is no gap between the claw and the notch hole, and the windshield device can be stably attached to the scale body.

Further, in the windshield device for a scale according to the present invention, the rising edges on the left and right sides of the shield plate are in contact with the inner surfaces of the left and right sides of the frame-like base frame.
By this contact, the left and right direction of the windshield device is positioned with respect to the balance body.

Further, in the windshield device for a scale according to the present invention, a metal inner panel that covers the inside of the rear frame is disposed at a position behind the weighing pan and in front of the rear frame, and the inner panel is formed after the top panel is removed. It is possible to pull it upward.
In this windshield device, the inner panel prevents the rear frame from being dirty, and the dirty inner panel can be removed and cleaned.

Further, in the windshield device for a scale according to the present invention, the inner panel is held on both side edges folded inside the rear frame, and an inner panel holder for guiding the inner panel when pulled out is attached.
Both side edges folded inside the rear frame are covered with the inner panel holder and are not exposed.

In the windshield device of the present invention, a transparent conductive film is coated on the inner surfaces of the front panel, the top panel, and the side panel, and the conductive film formed on the front panel is formed on the front side of the frame-shaped base frame. The conductive coating formed on the top panel and the side panel is electrically connected to the shield plate through the spring contact member disposed, and the conductive film formed on the top panel and the side panel is connected to the rear frame through the spring contact member disposed at the base of the guide frame. The rear frame is electrically connected, and is electrically connected to the shield plate via a spring-like contact member disposed on the rear side of the frame-shaped base frame.
Since the measurement accuracy of the electronic balance is affected when the windshield device is charged with static electricity, a shielded windshield device has been used conventionally. However, when the windshield device is detachable from the scale body and the top panel and the side panel are slidable, it is difficult to secure the conduction path of the windshield device. The top panel and the side panel are electrically connected to the metal rear frame using a contact member, and the fixed rear frame and front panel are electrically connected to the shield plate using the contact member.

Moreover, in the windshield apparatus for scales of this invention, the lower end of metal inner panels is made to contact a shield board, and the inner panel and the shield board are electrically connected.
Therefore, even if the windshield device is detachable from the scale body, the top panel and the side panel are slidable, and the inner panel is removable, the static electricity in the weighing space can be released, resulting in static electricity. It is possible to suppress a decrease in accuracy of the electronic balance.

The scale windshield device of the present invention can be easily attached to and detached from the scale body and cleaned inside. Also, static electricity that affects the weighing accuracy of the scale body can be released.

The figure which shows the electronic balance with which the windshield apparatus which concerns on embodiment of this invention was mounted | worn. The figure which shows the state which removed the windshield apparatus of FIG. 1 from the scale main body. 1 is an exploded perspective view of the windshield device and the shield plate of FIG. The figure which looked at the frame-shaped base frame of the windshield device of FIG. 1 from the back side The figure which shows the latch of the windshield apparatus of FIG. The figure which shows the procedure when mounting | wearing the balance main body with the windshield apparatus of FIG. The figure which shows the windshield apparatus and scale main body after operation of FIG.6 (b). The figure which shows the nail | claw shape of the windshield apparatus of FIG. The figure which shows the state which pulls out the inner panel of the windshield apparatus of FIG. The figure which shows the conductive path from the windshield apparatus of FIG. 1 to a shield board The figure which shows the contact member which implement | achieves the conductive path 1 of FIG. The figure which shows the contact member which implement | achieves the conductive path 2 and the conductive path 6 of FIG. The figure which shows the contact member which implement | achieves the conductive path 5 of FIG.

FIG. 1 shows a state in which a windshield device 20 according to an embodiment of the present invention is mounted on a scale body 10. Fig.1 (a) is the perspective view seen from diagonally forward, FIG.1 (b) is the perspective view seen from diagonally backward. FIG. 2 shows a state in which the windshield device 20 is removed from the scale body 10.
There is a weighing pan 11 supported by a support shaft (not shown) on the upper surface of the case body 10, and a rectangular shield plate 12 covering substantially the entire surface of the case except the periphery of the support shaft is provided on the upper surface of the case. It is fixed. The shield plate 12 is electrically connected to the inside of the scale body 10.

As shown in the exploded perspective view of FIG. 3, the windshield device 20 includes a rectangular frame-shaped base frame 21 having a size corresponding to the outer periphery of the shield plate 12, and a rear side (rear side) of the frame-shaped base frame 21. ) A rear frame 22 erected on top, an inner panel 28 disposed in front of the rear frame 22, a base portion 231 fixed to the upper end of the rear frame 22, and a pair of front ends extending from both ends of the base portion 231 A guide frame 23 having a guide portion 232, a transparent front panel 24 having an upper edge fixed to the tip of the guide portion 232, and a lower edge locked to the front side (front side) of the frame-like base frame 21, A transparent top panel 25 supported by a pair of guide portions 232 of the guide frame 23 so as to be slidable in the front-rear direction, each guide portion 232 of the guide frame 23 and a frame-shaped base The left and right sides of the frame 21 (left side edge, right side edge) and a

side panel

26, 27 of the transparent right slidably supported in the longitudinal direction between the.

The rear frame 22 and the inner panel 28 are made of metal, and the frame-shaped base frame 21 is formed of resin. In the guide frame 23, a base portion 231 and a guide portion 232 are integrally formed of resin. The front panel 24, the top panel 25, and the

side panels

26 and 27 are made of transparent glass or an acrylic plate.
Guide portions 212 of sliding

side panels

26 and 27 are provided on the left and right side sides of the frame-shaped base frame 21.
The rear frame 22 has a mounting portion 222 screwed to the rear side of the frame-shaped base frame 21 at the lower edge, and has a mounting portion 221 screwed to the base 231 of the guide frame 23 at the upper edge. ing.

The rear frame 22 has both side edges folded back inward, and an inner panel holder 281 that holds the inner panel 28 is fixed to the folded piece. The inner panel holder 281 has a groove into which the folded piece of the rear frame 22 is fitted. When the inner panel holder 281 is fixed to the folded piece of the rear frame 22, the folded piece is covered by the inner panel holder 281.
The pair of inner panel holders 281 fixed to the folded pieces of the rear frame 22 has grooves in which the side edges of the inner panel 28 are fitted to the surfaces facing each other, and the inner panel 28 is held by the grooves, Further, when the inner panel 28 is pulled upward, it is guided by this groove.
The inner panel 28 is provided with a recess at the center so that the windshield device 20 is not attached to the weighing pan 11 when the windshield device 20 is mounted on the scale body 10.

A screw hole for receiving the fixing bolt 241 of the front panel 24 is provided on the distal end side of the guide portion 232 of the guide frame 23, and the front edge of the front panel 24 is fixed to the guide portion 232 of the guide frame 23 by the fixing bolt 241. Combined, the lower edge is locked and fixed to the front panel holder portion 211 on the front side of the frame-shaped base frame 21.
Further, knobs 251, 261, 271 are fixed to the sliding top panel 25 and

side panels

26, 27 by fixing

bolts

252, 262, 272, respectively.
A transparent conductive film (such as an ITO film) is formed inside the front panel 24, the top panel 25, and the

side panels

26 and 27. As will be described later, these conductive films are finally electrically connected to the shield plate 12 that is electrically connected to the inside of the scale body 10.
The four sides of the shield plate 12 are raised at the edges, two notched holes 121 are formed at the rising edge of the front side, and the notched holes 122 are formed at one central position at the rising edge of the rear side. Is formed.

FIG. 4 shows the back side of the frame-shaped base frame 21. On the back surface of the front side of the frame-shaped base frame 21, two claws 213 that engage with the cutout holes 121 of the shield plate 12 are formed inward. Further, the left and right side sides of the frame-shaped base frame 21 have inner side surfaces 214 with which the left and right rising edges of the shield plate 12 abut on the back surface. Further, the rear side of the frame-shaped base frame 21 does not have an outer peripheral wall on the back surface, unlike the front side and the left and right side sides. This is for the purpose of allowing the claws of the latch 40 described later to enter the lower side of the frame-like base frame 21.

The latch 40 is fixed to the lower edge of the outer surface of the rear frame 22 as shown in FIG. The latch 40 includes a claw that engages with a notch hole 122 formed at the rising edge of the rear side of the shield plate 12.
As shown in FIG. 5, the latch 40 includes a base portion 41 fixed to the lower edge of the rear frame 22, and a rotating portion supported by the base portion 41 so as to be horizontally rotatable via a hinge portion 42. 43, a shield holding portion 44 extending obliquely downward from the lower edge of the rotating portion 43, and a snap portion 45 for locking the rotating portion 43 rotated to a position overlapping the base portion 41, A claw 441 that engages with the notch hole 122 is formed in the shield holding portion 44.
When the windshield device 20 is mounted on the scale body 10 and the claw 441 rotates until the rotating portion 43 overlaps the base portion 41 and the rotating portion 43 is locked to the snap portion 45, the shield plate 12. Is engaged with a notch hole 122 on the rear side of the. At this time, both side portions 442 of the claw 441 abut on the rising edge of the rear side of the shield plate 12.

FIG. 6 shows a procedure for mounting the windshield device 20 on the scale body 10.
With the rotating portion 43 of the latch 40 released from the snap portion 45, the windshield device 20 is placed on the balance body 10 as shown in FIG. At this time, the left and right rising edges of the shield plate 12 come into contact with the rear inner side surfaces 214 on the left and right sides of the frame-like base frame 21, and the lateral position of the windshield device 20 with respect to the scale body 10 is restricted.
Next, the windshield device 20 is moved in the direction of the arrow in FIG. By this movement, the claw 213 formed on the back surface of the front side of the frame-shaped base frame 21 is engaged with the notch hole 121 of the shield plate 12 from the front side. FIG. 7 shows the windshield device 20 and the balance body 10 after the movement.

Next, the turning portion 43 of the latch 40 is turned to a position overlapping the base portion 41, and the turning portion 43 is locked to the snap portion 45. By this operation, the claw 441 formed on the shield holding portion 44 of the latch 40 is engaged with the notch hole 122 on the rear side of the shield plate 12 from the rear side, and at the same time, both side portions 442 of the shield holding portion 44 are It contacts the rising edge of the rear side of the shield plate 12.
Therefore, the position of the windshield device 20 in the front-rear direction with respect to the balance body 10 is determined by the claw 213 formed on the back surface of the front side of the frame-shaped base frame 21 and the shield restraining portion 44 of the latch 40 from the front and rear. It is fixed by pinching. Also, the position in the left-right direction is fixed by the left and right rising edges of the shield plate 12 coming into contact with the back-side inner surface 214 of the left and right sides of the frame-like base frame 21.
Further, the windshield device 20 can be detached from the scale body 10 by performing the reverse operation.

As shown in FIGS. 8A and 8B, the claw 213 formed on the back surface of the frame-shaped base frame 21 and the claw 441 formed on the shield holding portion 44 of the latch 40 are further away from the tip of the claw. It is desirable to incline the surface to increase the thickness. By doing so, both can be engaged so that a gap does not occur between the

claws

213 and 441 and the cutout holes 121 and 122, and the windshield device 20 is not loosened against the scale body 10. Can be mounted in a stable state.

Thus, the windshield device 20 can be attached to and detached from the scale body 10 with a single touch. Therefore, when the windshield device 20 is removed from the scale body 10 to clean the inside of the weighing pan 11 and the windshield device 20 and then reassembled after cleaning, the operation is simple.

Further, as shown in FIG. 1A, the windshield device 20 has a measuring space divided by a front panel 24, a top panel 25,

side panels

26 and 27, and an inner panel 28. Of these, the top panel 25 and the

side panels

26 and 27 can be slid rearward and removed, and the inner panel 28 is pulled upward with the top panel 25 removed as shown in FIG. Can do.

Therefore, when the inside of the windshield device 20 is contaminated with an object to be weighed, the windscreen device 20 is removed from the scale body 10 or the windscreen device 20 is attached to the scale body 10 while the front panel 24, the top panel 25, The

side panels

26 and 27 or the inner panel 28 can be removed from the windshield device 20 and cleaned.
In this windshield device 20, it is difficult to remove the rear panel 22. However, since the rear panel 22 is covered with the inner panel 28, the inner side of the rear panel 22 is not exposed to the measuring space and is soiled by the object to be weighed. There is no fear.

Further, in this windshield device 20, the conductive coating formed on the non-sliding front panel 24 is electrically connected to the shield plate 12 by the conductive path 1 as shown in FIG. The conductive coating formed on the sliding top panel 25 and

side panels

26 and 27 is electrically connected to the metal rear panel 22 through the conductive path 6, the conductive path 2 and the conductive path 3, respectively. The conductive path 5 is electrically connected to the shield plate 12. Moreover, the metal inner panel 28 makes the lower end directly contact the shield plate 12 (conductive path 4).
The conductive path 1, the conductive path 2, the conductive path 3, the conductive path 5, and the conductive path 6 are formed using a contact member such as a leaf spring.

FIG. 11 shows an example of a contact member that forms the conductive path 1. The contact member 50 is disposed in a groove on the front side of the frame-like base frame 21 and elastically contacts the lower inner surface (surface on which the conductive film is formed) of the front panel 24 inserted in the groove. A contact portion 501 and a shield plate contact portion 502 that elastically contacts the shield plate 12 are provided. With this contact member 50, the conductive coating on the front panel 24 is electrically connected to the shield plate 12.

FIG. 12 shows an example of a contact member that forms the conductive path 3 and the conductive path 6. The contact member 51 includes a top panel conductive film contact portion 511 that contacts the inner surface of the top panel 25 and a side panel conductive film contact portion 512 that contacts the inner surface of the side panel 27. However, together with the base portion 231 of the guide frame 23, it is fixed to the attachment portion 221 of the rear panel 22 with screws. By this contact member 51, the conductive coatings of the top panel 25 and the side panel 27 are electrically connected to the rear panel 22.

FIGS. 13A and 13B show an example of a contact member that forms the conductive path 5. As shown in FIG. 13B, the contact member 52 has a pair of shield plate contact pieces 521 that contact the shield plate 12, and a screwed hole is provided between the pair of shield plate contact pieces 521. Have. As shown in FIG. 13A, the contact member 52 is disposed on the back surface of the frame-shaped base frame 21, and is fixed to the attachment portion 222 of the rear panel 22 together with the frame-shaped base frame 21 with screws. The rear panel 22 is electrically connected to the shield plate 12 by the contact member 52.

As described above, the windshield device 20 can be attached to and detached from the scale body 10 and can maintain the shield function even when the top panel 25 and the

side panels

26 and 27 are slidable. Static electricity that affects the measurement accuracy of the main body 10 can be released, and a decrease in measurement accuracy can be suppressed.
In addition, the structure shown here is an example, Comprising: This invention is not limited only to the structure.

The windshield device for a scale according to the present invention can be easily attached to and detached from the scale body and cleaned inside, and can be widely applied to scales that perform weighing in various environments.

DESCRIPTION OF SYMBOLS 10 Scale main body 11 Weighing pan 12 Shield plate 20 Windshield device 21 Frame-shaped base frame 22 Rear frame 23 Guide frame 24 Front panel 25 Top panel 26 Side panel 27 Side panel 28 Inner panel 40 Latch 41 Base part 42 Hinge part 43 Turning part 44 Shield holding part 45 Snap part 50 Contact member 51 Contact member 52 Contact member 121 Notch hole 122 Notch hole 211 Front panel holder part 212 Side panel guide part 213 Claw 214 Inner side surface 221 Attachment part 222 Attachment part 231 Base part 232 Guide part 241 Front panel fixing bolt 251 Knob 252 Knob fixing bolt 261 Knob 262 Knob fixing bolt 271 Knob 272 Knob fixing bolt 281 Inner panel holder 4 1 pawl 442 claw sides 501 front panel conductive coating contact portion 502 shield plate contacting portion 511 top panel conductive coating contact portion 512 side panel conductive coating contact portion 521 shield plate contact piece

Claims

A support shaft supporting the weighing pan protrudes from the upper surface, and a square shield plate fixed to the upper surface covers the entire upper surface except the periphery of the support shaft, and is attached via the shield plate. A windshield device,
A frame-shaped base frame resin-molded into a quadrangular shape corresponding to the outer periphery of the shield plate;
A metal rear frame erected on the rear side of the frame-shaped base frame;
A guide frame having a base fixed to the upper end of the rear frame, and a pair of guide portions extending forward from both ends of the base, the base and the guide being integrally molded with resin;
A transparent front panel having an upper edge fixed to the tip of the guide portion of the guide frame and a lower edge locked to the front side of the frame-shaped base frame;
A transparent top panel supported by a pair of guide portions of the guide frame so as to be slidable in the front-rear direction;
Transparent left and right side panels supported so as to be slidable in the front-rear direction between each guide portion of the guide frame and the left and right sides of the frame-shaped base frame,
With
The shield plate has a notch hole on each of the rising edges of the opposing sides, and a claw that engages with each of the notch holes from the outside is provided on the windshield device side. Windshield device.
The scale windshield device according to claim 1, wherein the notch hole is formed in the rising edge of the front side and the rising edge of the rear side of the shield plate, and is formed in the rising edge of the front side of the shield plate. The claw that engages with the notch hole is provided inwardly on the back surface of the front side of the frame-shaped base frame, and the notch hole formed on the rising edge of the rear side of the shield plate. The claw to be engaged is provided on a latch fixed to the outer surface of the rear frame,
The latch extends downward from a lower edge of the rotating part, a base part fixed to the rear frame, a rotating part supported by the base part via a hinge part so as to be horizontally rotatable. A shield holding portion, the claw provided in the shield holding portion, and a snap portion for locking the rotating portion rotated to a position overlapping the base portion, wherein the rotating portion is the The scale windshield device, wherein the claw of the shield holding portion engages with the notched hole formed in the rising edge of the rear side of the shield plate while being locked to the snap portion.
3. The windshield device for scale according to claim 2, wherein the claw is shaped so as to increase in thickness as the claw is separated from the tip of the claw.
It is a windshield device for scales in any one of Claim 1 to 3, Comprising: The rising edge of the left-right side edge of the said shield board contact | abuts to the inner surface of the left-right side edge of the said frame-shaped base frame. Characteristic draft shield device.
5. The windshield device for scale according to claim 1, wherein a metal inner panel that covers an inner side of the rear frame is disposed at a position behind the weighing pan and in front of the rear frame, A windshield device for scale, wherein the inner panel can be pulled upward after the top panel is removed.
6. The windshield device for scale according to claim 5, wherein an inner panel holder for holding the inner panel and guiding the inner panel when pulled out is attached to both side edges folded inside the rear frame. A windshield device for a scale characterized by comprising:
The windshield device for scale according to any one of claims 1 to 6, wherein a transparent conductive film is coated on inner surfaces of the front panel, top panel, and side panel, and the conductive film formed on the front panel Is electrically connected to the shield plate via a spring-like contact member disposed on the front side of the frame-shaped base frame, and the conductive coating formed on the top panel and the side panel is the base portion of the guide frame. The rear frame is electrically connected to the rear frame via a spring-like contact member arranged on the frame, and the rear frame is electrically connected to the shield plate via a spring-like contact member arranged on the rear side of the frame-like base frame. A windshield device for a scale characterized by being connected.
8. The windshield device for scale according to claim 7, wherein a lower end of the inner panel is in contact with the shield plate, and the inner panel and the shield plate are electrically connected.