JP5195596B2 - electronic balance - Google Patents
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- JP5195596B2 JP5195596B2 JP2009091255A JP2009091255A JP5195596B2 JP 5195596 B2 JP5195596 B2 JP 5195596B2 JP 2009091255 A JP2009091255 A JP 2009091255A JP 2009091255 A JP2009091255 A JP 2009091255A JP 5195596 B2 JP5195596 B2 JP 5195596B2
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Description
本発明は、気流の影響を防止する風防を備える電子天秤に関する。 The present invention relates to an electronic balance equipped with a windshield that prevents the influence of airflow.
実験室では、粉体等の被測定物を計量するために、電子天秤が使用されている。このとき、測定者は、電子天秤の上面に形成された計量皿の載置面に、へら若しくはスプーン（スパチュラ）を用いて被測定物を載置していきながら、表示された測定結果を確認することで、目的重量の被測定物を得ている。
ところで、薬品工業や化学工業等の実験室では、多量の被測定物を計量したり、少量（例えば、０．１ｍｇ）の被測定物を計量したりするように、様々な量の被測定物を計量することになる。このとき、少量の被測定物を計量する際には、微量の秤量が極めて重要となる。しかし、扉開閉により秤量室内の気流が不安定になり、計量値の安定に時間がかかる。特に、空調から吹き出される気流の影響を受ける場所で、被測定物を計量する場合には、空調の気流による計量皿のゆれ（振動）が生じるので、表示される測定結果がいつまでたっても大きくなったり小さくなったりするように変動する。
In the laboratory, an electronic balance is used to measure an object to be measured such as powder. At this time, the measurer confirms the displayed measurement result while placing the object to be measured on the placement surface of the weighing pan formed on the upper surface of the electronic balance using a spatula or a spoon (spatula). By doing so, an object to be measured having a target weight is obtained.
By the way, in laboratories such as the pharmaceutical industry and the chemical industry, various quantities of measured objects can be measured, such as weighing a large amount of measured objects or measuring a small amount (for example, 0.1 mg) of measured objects. Will be weighed. At this time, when a small amount of an object to be measured is weighed, a small amount of weighing is extremely important. However, the air flow in the weighing chamber becomes unstable due to the opening and closing of the door, and it takes time to stabilize the measured value. In particular, when weighing objects under the influence of airflow blown out from air conditioning, the weighing pan shakes (vibrates) due to the airflow from the air conditioning, so the displayed measurement result is always large. It fluctuates to become smaller or smaller.
そこで、気流の影響を防止するための風防を備える電子天秤が開示されている（例えば、特許文献１参照）。図５は、風防を備える電子天秤の一例を示す平面図であり、図６及び図７は、図５に示す側面図であり、図８は、図５に示すＢ−Ｂ線の断面図である。
電子天秤１０１は、秤量機構等を有する電子天秤本体１１０と、被測定物が載置される取付部付計量皿１４０と、気流の影響を防止する風防１２０とを備える。
電子天秤本体１１０は、扁平なハウジング１１０ａと、ハウジング１１０ａの上面の前部側に設けられたパネル部１１０ｂと、ハウジング１１０ａの上面の中央部に設けられた円錐形状の凸部１１０ｃと、ハウジング１１０ａの内部に収納された秤量機構（図示せず）とを備える。
取付部付計量皿１４０は、上方から視ると直径Ｄｄ（例えば、８〜９ｃｍ）の円形状の載置面を有する計量皿１４０ｂと、計量皿１４０ｂの下面の中央部に形成された孔を有する取付部１４０ａとを有する。これにより、取付部付計量皿１４０は、電子天秤本体１１０の凸部１１０ｃが取付部１４０ａの孔に挿入されることにより、電子天秤本体１１０の上面に取り付けられるようになっている。
Then, the electronic balance provided with the windshield for preventing the influence of an airflow is disclosed (for example, refer patent document 1). 5 is a plan view showing an example of an electronic balance equipped with a windshield, FIGS. 6 and 7 are side views shown in FIG. 5, and FIG. 8 is a cross-sectional view taken along line BB shown in FIG. is there.
The electronic balance 101 includes an electronic balance main body 110 having a weighing mechanism and the like, a weighing pan 140 with a mounting portion on which an object to be measured is placed, and a windshield 120 that prevents the influence of airflow.
The electronic balance body 110 includes a flat housing 110a, a panel portion 110b provided on the front side of the upper surface of the housing 110a, a conical convex portion 110c provided at the center of the upper surface of the housing 110a, and a housing 110a. And a weighing mechanism (not shown) housed inside.
The weighing pan 140 with a mounting portion has a hole formed in a central portion of the lower surface of the weighing pan 140b and a weighing pan 140b having a circular mounting surface having a diameter Dd (for example, 8 to 9 cm) when viewed from above. And a mounting portion 140a. Thereby, the weighing pan 140 with an attachment part is attached to the upper surface of the electronic balance main body 110 by inserting the convex part 110c of the electronic balance main body 110 into the hole of the attachment part 140a.
風防１２０は、ガラス製の四角形の前側壁３０ａと、ガラス、金属又はプラスチック製の四角形の後側壁３０ｂと、前側壁３０ａの四隅と後側壁３０ｂの四隅との間で互いに平行に形成された四本のガイド柱部３０ｃとを有する枠体（側壁）３０と、ガラス製の四角形の上側開口部開閉部材２１と、ガラス製の四角形の右側開口部開閉部材１２２と、ガラス製の四角形の左側開口部開閉部材２３とを有する。
４本のガイド柱部３０ｃには、上側開口部開閉部材２１と右側開口部開閉部材１２２と左側開口部開閉部材２３とを前後方向にスライドさせることができる溝が形成されており、この溝に、上側開口部開閉部材２１の左右端部が挿入されることで、上側開口部開閉部材２１が前後方向に移動可能となるように枠体３０の上面に取り付けられ、右側開口部開閉部材１２２の上下端部が挿入されることで、右側開口部開閉部材１２２が前後方向に移動可能となるように枠体３０の右側面に取り付けられ、左側開口部開閉部材２３の上下端部が挿入されることで、左側開口部開閉部材２３が前後方向に移動可能となるように枠体３０の左側面に取り付けられる。
なお、上側開口部開閉部材２１が、枠体３０の上面に取り付けられることにより、上壁として働くことになる。
The windshield 120 is formed of a glass front side wall 30a, a glass, metal or plastic square rear side wall 30b, and four corners formed in parallel with each other between the four corners of the front side wall 30a and the rear side wall 30b. Frame (side wall) 30 having a guide pillar 30c, a glass square upper opening opening / closing member 21, a glass square right opening opening / closing member 122, and a glass square left opening Part opening / closing member 23.
The four guide pillars 30c are formed with grooves that allow the upper opening / closing member 21, the right opening / closing member 122, and the left opening / closing member 23 to slide in the front-rear direction. By inserting the left and right ends of the upper opening / closing member 21, the upper opening / closing member 21 is attached to the upper surface of the frame 30 so as to be movable in the front-rear direction. By inserting the upper and lower ends, the right opening opening / closing member 122 is attached to the right side surface of the frame 30 so as to be movable in the front-rear direction, and the upper and lower ends of the left opening opening / closing member 23 are inserted. Thus, the left opening opening / closing member 23 is attached to the left side surface of the frame 30 so as to be movable in the front-rear direction.
The upper opening / closing member 21 is attached to the upper surface of the frame body 30 to serve as an upper wall.
また、上側開口部開閉部材２１の上面の前部には、上方に突出する把持部２１ａが形成されており、右側開口部開閉部材１２２の右側面の前部には、右方に突出する把持部１２２ａが形成されており、左側開口部開閉部材２３の左側面の前部には、左方に突出する把持部２３ａが形成されている。
これにより、測定者は、把持部２１ａを手で掴んで上側開口部開閉部材２１を後方向にスライドさせることで、図７に示すように枠体３０の上側開口部を開けたり、図６に示すように前方向にスライドさせることで上側開口部を閉じたりすることができるようになっている。また、把持部１２２ａを手で掴んで右側開口部開閉部材１２２を後方向にスライドさせることで、図７に示すように枠体３０の右側開口部を開けたり、図６に示すように前方向にスライドさせることで右側開口部を閉じたりすることができるようになっている。さらに、把持部２３ａを手で掴んで左側開口部開閉部材２３を後方向にスライドさせることで、枠体３０の左側開口部を開けたり、前方向にスライドさせることで、左側開口部を閉じたりすることができるようになっている。
In addition, a gripping portion 21 a that protrudes upward is formed on the front portion of the upper surface of the upper opening opening / closing member 21, and a gripping protrusion that protrudes to the right is formed on the front portion of the right opening surface of the right opening opening / closing member 122. A portion 122 a is formed, and a grip portion 23 a that protrudes to the left is formed in the front portion of the left side surface of the left opening opening / closing member 23.
As a result, the measurer can open the upper opening of the frame 30 as shown in FIG. 7 by holding the grip 21 a by hand and sliding the upper opening / closing member 21 backward, as shown in FIG. As shown, the upper opening can be closed by sliding it forward. Further, by grasping the grip portion 122a by hand and sliding the right opening opening / closing member 122 backward, the right opening portion of the frame body 30 is opened as shown in FIG. 7, or the forward direction as shown in FIG. The right opening can be closed by sliding it to the right. Further, by grasping the grip portion 23a by hand and sliding the left-side opening opening / closing member 23 backward, the left-side opening portion of the frame 30 is opened, or by sliding forward, the left-side opening portion is closed. Can be done.
このような風防１２０が上方から電子天秤本体１１０に載置されることにより、風防１２０の内部に取付部付計量皿１４０が配置される。そして、測定者は、把持部１２２ａ等を手で掴んで後方向にスライドさせることで、右側開口部等を開けることにより、計量皿１４０ｂの載置面の中央部にへら若しくはスプーンを用いて被測定物を載置し、計量皿１４０ｂに被測定物を載置した後には、把持部１２２ａ等を手で掴んで後方向にスライドさせることで、右側開口部等を閉じることにより、パネル部１１０ｂに表示された測定結果を確認している。 By placing such a windshield 120 on the electronic balance main body 110 from above, the weighing pan 140 with a mounting portion is disposed inside the windshield 120. Then, the measurer grasps the grip portion 122a with his / her hand and slides it backward to open the right side opening portion or the like, thereby using a spatula or spoon at the center of the mounting surface of the weighing pan 140b. After placing the object to be measured and placing the object to be measured on the weighing pan 140b, the panel part 110b is closed by closing the right opening and the like by grasping the grip part 122a and the like and sliding it backward. The measurement result displayed in is confirmed.
しかしながら、非常に小さなものの測定、又は、粉等の量りとり（小さなスプーン（スパチュラを用いて粉を計量皿に載せる）測定を行う測定者は、面積Ｄｅ×Ｄｆ（例えば、１３ｃｍ×２２．５ｃｍ＝２９２．５ｃｍ２）の右側開口部等を開く必要があり、その後、パネル部１１０ｂに表示された測定結果を確認することになるが、右側開口部等が開かれた状態のときには、風防１２０の内部への空気の流れが存在するので、右側開口部等が閉じられた後でも、風防１２０の内部の雰囲気状態が安定化されるまでに、時間がかかるという問題があった。
さらに、計量皿１４０ｂの載置面の中央部に被測定物を載置するために、へら若しくはスプーン（スパチュラ）を握った測定者の手が、右側開口部等を介して風防１２０の内部へ入ると、風防１２０の内部の空気が温まる。このことは、風防１２０の内部の熱平衡を乱し、風防１２０の内部の空気の移動につながる。その結果、計量皿１４０ｂに被測定物を載置し、右側開口部等が閉じられた後でも、風防１２０の内部の雰囲気状態が安定化されるまでに、時間がかかるという問題があった。
However, a measurer who measures a very small thing or measures a powder or the like (a small spoon (powder is placed on a weighing pan using a spatula)) has an area De × Df (for example, 13 cm × 22.5 cm = 292.5 cm 2 ) of the right opening or the like needs to be opened, and then the measurement result displayed on the panel 110b is confirmed. When the right opening or the like is opened, the windshield 120 Since there is a flow of air to the inside, there is a problem that it takes time until the atmospheric state inside the windshield 120 is stabilized even after the right opening or the like is closed.
Further, in order to place the object to be measured on the center of the placing surface of the weighing pan 140b, the measurer's hand holding a spatula or a spoon (spatula) moves into the draft shield 120 through the right opening or the like. When entering, the air inside the windshield 120 is warmed. This disturbs the thermal balance inside the windshield 120 and leads to the movement of air inside the windshield 120. As a result, there is a problem that it takes time until the atmosphere inside the windshield 120 is stabilized even after the measurement object is placed on the weighing pan 140b and the right opening or the like is closed.
また、多量の被測定物を計量するために、直径Ｄｄ（例えば、８〜９ｃｍ）の大計量皿と、面積Ｄｅ×Ｄｆ（例えば、１３ｃｍ×２２．５ｃｍ ＝２９２．５ｃｍ２）の右側開口部等を有する大型の風防とを備える電子天秤と、少量（例えば、０．１ｍｇ）の被測定物を計量するために、直径Ｄａ（例えば、３ｃｍ）の小計量皿と、面積Ｄｂ×Ｄｃ（例えば、４×５ｃｍ２）の右側開口部等を有する小型の風防とを備える電子天秤との二つの電子天秤を準備することも考えられるが、二つの電子天秤を準備するため、コストがかかる。
そこで、本発明は、多量の被測定物を計量するために使用可能な風防を用いても、少量の被測定物を計量する際には、風防（秤量室）の気流の乱れを軽減し、さらに計量皿の載置面の中央部に被測定物を載置するために、測定者の手が風防の内部へ入ることを防止することにより、風防の内部の雰囲気状態が安定化されるまでに必要とされる時間を短くすることができる電子天秤を提供することを目的とする。加えて、皿までのアクセスが近くなるため、作業性も向上することができる。
In addition, in order to weigh a large amount of objects to be measured, a large weighing pan having a diameter Dd (for example, 8 to 9 cm) and a right opening having an area De × Df (for example, 13 cm × 22.5 cm = 292.5 cm 2 ) An electronic balance equipped with a large draft shield having the same, a small weighing pan with a diameter Da (for example, 3 cm), and an area Db × Dc (for example, for measuring a small amount (for example, 0.1 mg)) Although it is conceivable to prepare two electronic balances including an electronic balance provided with a small windshield having a right opening of 4 × 5 cm 2 ) and the like, it costs much to prepare two electronic balances.
Therefore, the present invention reduces the turbulence of the airflow in the draft shield (weighing chamber) when weighing a small amount of measurement object, even if a draft shield that can be used to measure a large amount of measurement object is used. Furthermore, in order to place the object to be measured on the central part of the weighing plate's placement surface, prevent the measurer's hand from entering the windshield until the atmospheric condition inside the windshield is stabilized. An object of the present invention is to provide an electronic balance capable of shortening the time required for the operation. In addition, since the access to the dish is close, workability can be improved.
上記課題を解決するためになされた本発明の電子天秤は、上壁と当該上壁の周縁部から下方に向かって下設された側壁とを有し、当該側壁には大開口部と当該大開口部を開閉可能とする大開口部開閉部材とが形成されている風防と、秤量機構を有する電子天秤本体と、被測定物が載置される載置面を有する大計量皿と、前記電子天秤本体の上面と着脱可能とする取付部とを有する取付部付大計量皿とを備え、前記風防が上方から電子天秤本体に載置されることにより、前記風防の内部に大計量皿が配置される電子天秤であって、大計量皿の載置面の面積より小さい面積の載置面を有する小計量皿と、前記電子天秤本体の上面と着脱可能とする取付部と、小計量皿と取付部とを所定の長さで水平方向に連結する連結部材とを有する取付部付小計量皿を備え、前記取付部付小計量皿は、前記取付部付大計量皿に代えて前記電子天秤本体に取り付け可能であり、前記側壁には、大開口部の面積より小さい面積の小開口部と当該小開口部を開閉可能とする小開口部開閉部材とが形成されているとともに、前記取付部付小計量皿を前記電子天秤本体に取り付けた状態において、前記小計量皿は、前記風防の内部で小開口部近傍に配置されるようにしている。 An electronic balance of the present invention made to solve the above problems has an upper wall and a side wall provided downward from the peripheral edge of the upper wall, and the side wall has a large opening and the large size. A windshield having a large opening opening / closing member capable of opening and closing the opening, an electronic balance body having a weighing mechanism, a large weighing pan having a placement surface on which an object to be measured is placed, and the electronic and a top surface and a large weighing pan with mounting portion having a mounting portion which can be removably mounted in the balance main body, by which the windshield is placed from above the electronic balance main body, a large weighing pan arranged inside the windshield A small weighing pan having a mounting surface smaller than the area of the mounting surface of the large weighing pan, a mounting portion that can be attached to and detached from the top surface of the electronic balance body, and a small weighing pan. A subtotal with a mounting portion having a connecting member for connecting the mounting portion with a predetermined length in the horizontal direction Comprising a dish, a small weighing pan with the mounting portion is attachable to the electronic balance main body in place of the large weighing pan with the mounting portion, the side wall is a small opening area smaller than the area of the large apertures And a small opening opening / closing member capable of opening and closing the small opening , and the small weighing pan is attached to the electronic balance body in the state where the small weighing pan with the mounting portion is attached to the windshield. I Ru is disposed near the small opening within which Unishi.
ここで、「小開口部近傍」とは、上下方向と垂直となる面において、側壁で囲まれる面積の中心でない位置であり、その中心より小開口部に近くなる位置のことをいい、例えば、小計量皿の載置面の中央部と小開口部との距離が１〜２ｃｍ程度となることが好ましい。
本発明の電子天秤によれば、側壁には、小さい面積の小開口部が形成されるとともに、小開口部を開閉可能とする小開口部開閉部材が形成されている。また、小さい面積の載置面を有する小計量皿を備え、小計量皿は、風防の内部で小開口部近傍に配置されるように、電子天秤本体の上面に取り付けられる。
これにより、測定者は、小開口部開閉部材で小開口部を開ける。このとき、小開口部が開かれた状態であっても、小開口部は小さい面積となっているので、風防の内部への空気の流れがあまり生じない。そして、測定者は、小計量皿の載置面にへら若しくはスプーンを用いて被測定物を載置することなになるが、小計量皿は小開口部近傍に配置されるので、風防の内部へへら若しくはスプーンを握った手を入れることとなく、風防の内部へへら若しくはスプーンのみを入れて、小計量皿の載置面の中央部に被測定物を載置することができる。小計量皿に被測定物を載置した後には、小開口部開閉部材で小開口部を閉じることにより、表示された測定結果を確認することになる。
Here, “near the small opening” means a position that is not the center of the area surrounded by the side wall on the surface perpendicular to the vertical direction, and is a position closer to the small opening than the center. It is preferable that the distance between the center of the mounting surface of the small weighing pan and the small opening is about 1 to 2 cm.
According to the electronic balance of the present invention, a small opening having a small area is formed on the side wall, and a small opening opening / closing member capable of opening and closing the small opening is formed on the side wall. Further, a small weighing pan having a mounting surface with a small area is provided, and the small weighing pan is attached to the upper surface of the electronic balance main body so as to be arranged in the vicinity of the small opening inside the windshield.
Thus, the measurer opens the small opening with the small opening opening / closing member. At this time, even if the small opening is in an open state, the small opening has a small area, so that there is not much air flow into the windshield. And, the measurer will place the object to be measured on the placement surface of the small weighing pan using a spatula or a spoon, but the small weighing pan is placed near the small opening, so the inside of the windshield The object to be measured can be placed at the center of the placement surface of the small weighing pan by putting only the spatula or spoon inside the draft shield without putting a hand holding the spatula or spoon. After placing the object to be measured on the small weighing pan, the displayed measurement result is confirmed by closing the small opening with the small opening opening / closing member.
以上のように、本発明の電子天秤によれば、風防（秤量室）の気流の乱れを軽減し、さらに小計量皿の載置面の中央部に被測定物を載置するために、測定者の手が風防の内部へ入ることを防止することにより、風防の内部の雰囲気状態が安定化されるまでに必要とされる時間を短くすることができる。加えて、小計量皿までのアクセスが近くなるため、作業性も向上することができる。 As described above, according to the electronic balance of the present invention, measurement is performed in order to reduce disturbance of the airflow in the draft shield (weighing chamber) and place the object to be measured on the center of the placement surface of the small weighing pan. By preventing a person's hand from entering the windshield, it is possible to shorten the time required until the atmospheric state inside the windshield is stabilized. In addition, since the access to the small weighing pan is close, workability can be improved.
（その他の課題を解決するための手段及び効果）
また、上記発明において、前記小計量皿の載置面の面積は、前記大計量皿の載置面の面積の１／２以下であるとともに、前記小開口部の面積は、前記大開口部の面積の１／２以下であるようにしてもよい。
そして、上記発明において、前記小開口部は、前記大開口部開閉部材に形成されているようにしてもよい。
本発明の電子天秤によれば、測定者の利き手である方向から、小計量皿の載置面にも大計量皿の載置面にも被測定物を載置することができるようになる。
さらに、上記発明において、前記上壁は四角形であり、前記側壁は前側壁と後側壁と右側壁と左側壁とを有し、前記右側壁に、前記大開口部と大開口部開閉部材とが形成されているようにしてもよい。
(Means and effects for solving other problems)
Further, in the above invention, the area of the mounting surface of the small weighing pan is less than or equal to 1/2 of the area of the mounting surface of the large weighing pan, and the area of the small opening is equal to that of the large opening. You may make it be 1/2 or less of an area.
And in the said invention, you may make it the said small opening part be formed in the said large opening part opening-closing member.
According to the electronic balance of the present invention, the object to be measured can be placed on the placement surface of the small weighing pan or the placement surface of the large weighing pan from the direction that is the dominant hand of the measurer.
Further, in the above invention, the upper wall is a quadrangle, the side wall includes a front side wall, a rear side wall, a right side wall, and a left side wall, and the right side wall includes the large opening and the large opening opening / closing member. It may be formed.
以下、本発明の実施形態について図面を用いて説明する。なお、本発明は、以下に説明するような実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の態様が含まれる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and includes various modes without departing from the spirit of the present invention.
図１は、本発明に係る電子天秤の一例を示す平面図であり、図２及び図３は、図１に示す側面図であり、図４は、図１に示すＡ−Ａ線の断面図である。なお、上述した電子天秤１０１と同様のものについては、同じ符号を付して、説明を省略することとする。
電子天秤１は、秤量機構等を有する電子天秤本体１０と、少量の被測定物が載置される取付部付小計量皿４０と、多量の被測定物が載置される取付部付大計量皿１４０と、気流の影響を防止する風防２０とを備える。
電子天秤本体１０は、扁平なハウジング１０ａと、ハウジング１０ａの上面の前部側に設けられたパネル部１０ｂと、ハウジング１０ａの上面の中央部に設けられた円錐形状の凸部１０ｃと、ハウジング１０ａの内部に収納された秤量機構（図示せず）とを備える。
円錐形状の凸部１０ｃには、水平方向に貫通する横棒部１０ｄが形成されている。これにより、凸部１０ｃが取付部付小計量皿４０の取付部４０ａの孔に挿入されることにより、取付部付小計量皿４０が、凸部１０ｃを軸として回転しないように電子天秤本体１０の上面に取り付けられるようになっている。
FIG. 1 is a plan view showing an example of an electronic balance according to the present invention, FIGS. 2 and 3 are side views shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along line AA shown in FIG. It is. In addition, about the thing similar to the electronic balance 101 mentioned above, suppose that the same code | symbol is attached | subjected and description is abbreviate | omitted.
The electronic balance 1 includes an electronic balance body 10 having a weighing mechanism, a small weighing pan 40 with a mounting portion on which a small amount of measurement object is placed, and a large weighing with a mounting portion on which a large amount of measurement object is placed. A dish 140 and a windshield 20 that prevents the influence of airflow are provided.
The electronic balance body 10 includes a flat housing 10a, a panel portion 10b provided on the front side of the upper surface of the housing 10a, a conical convex portion 10c provided at the center of the upper surface of the housing 10a, and a housing 10a. And a weighing mechanism (not shown) housed inside.
A horizontal bar portion 10d penetrating in the horizontal direction is formed on the conical convex portion 10c. As a result, the convex portion 10c is inserted into the hole of the mounting portion 40a of the small weighing pan 40 with the mounting portion, so that the small weighing pan 40 with the mounting portion does not rotate around the convex portion 10c. It is designed to be attached to the top surface.
風防２０は、ガラス製の四角形の前側壁３０ａと、金属、ガラス又はプラスチック製の四角形の後側壁３０ｂと、前側壁３０ａの四隅と後側壁３０ｂの四隅との間で互いに平行に形成された四本のガイド柱部３０ｃとを有する枠体（側壁）３０と、ガラス製の四角形の上側大開口部開閉部材２１と、ガラス製の四角形の右側大開口部開閉部材２２と、ガラス製の四角形の左側大開口部開閉部材２３とを有する。
４本のガイド柱部３０ｃには、上側大開口部開閉部材２１と右側大開口部開閉部材２２と左側大開口部開閉部材２３とを前後方向にスライドさせることができる溝が形成されており、この溝に、上側大開口部開閉部材２１の左右端部が挿入されることで、上側大開口部開閉部材２１が前後方向に移動可能となるように枠体３０の上面に取り付けられ、右側大開口部開閉部材２２の上下端部が挿入されることで、右側大開口部開閉部材２２が前後方向に移動可能となるように枠体３０の右側面に取り付けられ、左側大開口部開閉部材２３の上下端部が挿入されることで、左側大開口部開閉部材２３が前後方向に移動可能となるように枠体３０の左側面に取り付けられる。
The windshield 20 includes four front side walls 30a made of glass, a rear side wall 30b of a square made of metal, glass or plastic, and four sides formed in parallel with each other between the four corners of the front side wall 30a and the four corners of the rear side wall 30b. Frame (side wall) 30 having a guide pillar 30c, a glass square upper large opening opening / closing member 21, a glass square right large opening opening / closing member 22, and a glass square A left large opening / closing member 23.
The four guide pillars 30c are formed with grooves capable of sliding the upper large opening opening / closing member 21, the right large opening opening / closing member 22, and the left large opening opening / closing member 23 in the front-rear direction. By inserting the left and right end portions of the upper large opening opening / closing member 21 into the groove, the upper large opening opening / closing member 21 is attached to the upper surface of the frame body 30 so as to be movable in the front-rear direction. By inserting the upper and lower ends of the opening / closing member 22, the right large opening / closing member 22 is attached to the right side surface of the frame 30 so as to be movable in the front-rear direction. When the upper and lower ends are inserted, the left large opening opening / closing member 23 is attached to the left side surface of the frame 30 so as to be movable in the front-rear direction.
右側大開口部開閉部材２２の右側面の前部には、右方に突出する把持部２２ａが形成されており、中央部には、四角形の小開口部２２ｂと、ガラス製の四角形の小開口部開閉部材５０と、小開口部開閉部材５０を前後方向にスライドさせることができる２本の溝２２ｄとが形成されている。小開口部開閉部材５０の右側面の前部には、右方に突出する把持部５０ａが形成されるとともに、小開口部開閉部材５０の左側面の前部には、左方に突出するストッパ部５０ｂが形成されている。
これにより、測定者は、把持部２２ａを手で掴んで右側大開口部開閉部材２２を後方向にスライドさせることで、面積Ｄｅ×Ｄｆ（例えば、１３ｃｍ×２２．５ｃｍ ＝２９２．５ｃｍ２）の右側大開口部を開けたり、前方向にスライドさせることで右側大開口部を閉じたりすることができるようになっている。また、把持部５０ａを手で掴んで小開口部開閉部材５０を後方向にスライドさせることで、図３に示すように面積Ｄｂ×Ｄｃ（例えば、４×５ｃｍ２）の小開口部２２ｂを開けたり、図２に示すように前方向にスライドさせることで小開口部２２ｂを閉じたりすることができるようになっている。
A right-side front opening / closing member 22 has a right-side front portion formed with a gripping portion 22a protruding rightward, and a rectangular small opening 22b and a glass small rectangular opening at the center. A part opening / closing member 50 and two grooves 22d capable of sliding the small opening part opening / closing member 50 in the front-rear direction are formed. A gripping portion 50a that protrudes to the right is formed on the front portion of the right side surface of the small opening portion opening / closing member 50, and a stopper that protrudes to the left is formed on the front portion of the left side surface of the small opening portion opening / closing member 50. A portion 50b is formed.
As a result, the measurer grasps the grip portion 22a with his / her hand and slides the right large opening opening / closing member 22 in the rearward direction so that the area De × Df (for example, 13 cm × 22.5 cm 2 = 292.5 cm 2 ). The right large opening can be closed by opening the right large opening or sliding it forward. Further, the small opening 22b having an area Db × Dc (for example, 4 × 5 cm 2 ) is opened as shown in FIG. 3 by grasping the grip 50a by hand and sliding the small opening / closing member 50 backward. Alternatively, the small opening 22b can be closed by sliding it forward as shown in FIG.
取付部付小計量皿４０は、上方から視ると直径Ｄａ（例えば、３ｃｍ）の円形状の載置面を有する小計量皿４０ｂと、円錐形状の凸部１０ｃが挿入される孔を有する取付部４０ａと、小計量皿４０ｂと取付部４０ａとを所定の長さで水平方向に連結する連結部材４０ｃとを有する。連結部材４０ｃの一端部の上面には、小計量皿４０ｂが取り付けられるとともに、連結部材４０ｃの他端部の下面には、取付部４０ａが取り付けられている。これにより、電子天秤本体１０に取付部付小計量皿４０が取り付けられると、小計量皿４０ｂの載置面の中央部が小開口部２２ｂ近傍に配置されるようになっている。例えば、小計量皿４０ｂの載置面の中央部と小開口部２２ｂとの距離が１〜２ ｃｍとなる。よって、測定者は、風防２０の内部へへら若しくはスプーンを握った手を入れることとなく、風防２０の内部へへら若しくはスプーンのみを入れて、小計量皿４０ｂの載置面の中央部に被測定物を載置することができるようになっている。 The small weighing pan 40 with a mounting portion has a small weighing pan 40b having a circular mounting surface with a diameter Da (for example, 3 cm) when viewed from above, and a mounting having a hole into which the conical convex portion 10c is inserted. It has the connection member 40c which connects the part 40a, the small weighing pan 40b, and the attachment part 40a with a predetermined length in the horizontal direction. A small weighing pan 40b is attached to the upper surface of one end portion of the connecting member 40c, and an attaching portion 40a is attached to the lower surface of the other end portion of the connecting member 40c. Thereby, when the small weighing pan 40 with a mounting part is attached to the electronic balance main body 10, the center part of the mounting surface of the small weighing dish 40b is arrange | positioned in the small opening part 22b vicinity. For example, the distance between the center of the mounting surface of the small weighing pan 40b and the small opening 22b is 1 to 2 cm. Therefore, the measurer does not put a spatula or a hand holding a spoon inside the windshield 20 but puts only the spatula or spoon inside the windshield 20 and covers the center of the placement surface of the small weighing pan 40b. A measurement object can be placed.
ここで、電子天秤１を用いて少量の被測定物を計量する計量方法について説明する。まず、測定者は、電子天秤本体１０の凸部１０ｃに取付部付小計量皿４０を取り付ける。次に、風防２０を上方から電子天秤本体１０に載置する。このとき、小計量皿４０ｂが、風防２０の内部で小開口部２２ｂ近傍に配置されることになる。次に、測定者は、把持部５０ａを手で掴んで後方向に小開口部開閉部材５０をスライドさせることで、図３に示すように小開口部２２ｂを開ける。このとき、小開口部２２ｂが開かれた状態であっても、小開口部２２ｂは小さい面積となっているので、秤量室（風防内）の気流の乱れを大幅に軽減することができる。次に、測定者は、小計量皿４０ｂにへら若しくはスプーンを用いて被測定物を載置する。このとき、測定者は、小計量皿４０ｂの中央部が小開口部２２ｂ近傍に配置されるので、風防２０の内部へへら若しくはスプーンを握った手を入れることとなく、小計量皿４０ｂの載置面の中央部に被測定物を載置することができる。次に、把持部５０ａを手で掴んで小開口部開閉部材５０を前方向にスライドさせることで、図２に示すように小開口部２２ｂを閉じることにより、パネル部１０ｂに表示された測定結果を確認することで、目的重量の被測定物を得る。 Here, a weighing method for weighing a small amount of an object to be measured using the electronic balance 1 will be described. First, the measurer attaches the small weighing pan 40 with an attachment portion to the convex portion 10 c of the electronic balance body 10. Next, the windshield 20 is placed on the electronic balance body 10 from above. At this time, the small weighing pan 40b is disposed in the vicinity of the small opening 22b inside the windshield 20. Next, the measurer opens the small opening 22b as shown in FIG. 3 by grasping the grip 50a by hand and sliding the small opening opening / closing member 50 backward. At this time, even if the small opening 22b is opened, the small opening 22b has a small area, so that the turbulence of the air flow in the weighing chamber (in the windshield) can be greatly reduced. Next, the measurer places the object to be measured on the small weighing pan 40b using a spatula or a spoon. At this time, the measurer places the small weighing pan 40b on the center of the small weighing pan 40b in the vicinity of the small opening 22b. An object to be measured can be placed at the center of the placement surface. Next, the measurement result displayed on the panel portion 10b is obtained by closing the small opening portion 22b as shown in FIG. 2 by grasping the holding portion 50a by hand and sliding the small opening portion opening / closing member 50 forward. By confirming the above, an object to be measured having a target weight is obtained.
以上のように、本発明の電子天秤１によれば、小開口部２２ｂが開かれた状態のときに、風防２０の内部への空気の流れをできるだけ防止し、さらに小計量皿４０ｂの中央部に被測定物を載置するために、測定者の手が風防２０の内部へ入ることを防止することにより、風防２０の内部の雰囲気状態が安定化されるまでに必要とされる時間を短くすることができる。
なお、電子天秤１を用いて多量の被測定物を計量する場合には、測定者は、電子天秤本体１０の凸部１０ｃに取付部付大計量皿１４０を取り付ける。次に、風防２０を上方から電子天秤本体１０に載置する。次に、測定者は、把持部２２ａを手で掴んで右側大開口部開閉部材２２を後方向にスライドさせることで、右側大開口部を開けることにより、大計量皿１４０ｂにへら若しくはスプーンを用いて被測定物を載置する。次に、把持部２２ａを手で掴んで右側大開口部開閉部材２２を前方向にスライドさせることで、右側大開口部を閉じることにより、パネル部１０ｂに表示された測定結果を確認することで、目的重量の被測定物を得ることになる。
As described above, according to the electronic balance 1 of the present invention, when the small opening 22b is opened, the flow of air into the windshield 20 is prevented as much as possible, and the central portion of the small weighing pan 40b is further prevented. In order to place the measurement object on the windshield 20, it is possible to shorten the time required until the atmosphere inside the windshield 20 is stabilized by preventing the measurer's hand from entering the windshield 20. can do.
When measuring a large amount of objects to be measured using the electronic balance 1, the measurer attaches the large weighing pan 140 with a mounting portion to the convex portion 10 c of the electronic balance body 10. Next, the windshield 20 is placed on the electronic balance body 10 from above. Next, the measurer uses a spatula or spoon on the large weighing pan 140b by opening the right large opening by holding the grip 22a by hand and sliding the right large opening opening / closing member 22 backward. Place the object to be measured. Next, by grasping the grip portion 22a by hand and sliding the right large opening opening / closing member 22 forward, the right large opening is closed, thereby confirming the measurement result displayed on the panel portion 10b. Thus, an object to be measured having a target weight is obtained.
本発明は、気流の影響を防止する風防を備える電子天秤に好適に利用できる。 INDUSTRIAL APPLICABILITY The present invention can be suitably used for an electronic balance equipped with a windshield that prevents the influence of airflow.
１、１０１ 電子天秤
１０ 電子天秤本体
２０、１２０ 風防
２１ 上側大開口部開閉部材（上壁）
２２ 右側大開口部開閉部材
２２ｂ 小開口部
２３ 左側大開口部開閉部材
３０ 枠体（側壁）
３０ａ 前側壁
３０ｂ 後側壁
４０ａ、１４０ａ 取付部
４０ｂ 小計量皿
４０ｃ 連結部材
５０ 小開口部開閉部材
１４０ｂ 大計量皿
DESCRIPTION OF SYMBOLS 1,101 Electronic balance 10 Electronic balance main body 20,120 Windshield 21 Upper large opening opening / closing member (upper wall)
22 Right large opening opening / closing member 22b Small opening 23 Left large opening opening / closing member 30 Frame (side wall)
30a Front side wall 30b Rear side walls 40a, 140a Mounting portion 40b Small weighing pan 40c Connecting member 50 Small opening opening / closing member 140b Large weighing pan
Claims (4)
秤量機構を有する電子天秤本体と、
被測定物が載置される載置面を有する大計量皿と、前記電子天秤本体の上面と着脱可能とする取付部とを有する取付部付大計量皿とを備え、
前記風防が上方から電子天秤本体に載置されることにより、前記風防の内部に大計量皿が配置される電子天秤であって、
大計量皿の載置面の面積より小さい面積の載置面を有する小計量皿と、前記電子天秤本体の上面と着脱可能とする取付部と、小計量皿と取付部とを所定の長さで水平方向に連結する連結部材とを有する取付部付小計量皿を備え、
前記取付部付小計量皿は、前記取付部付大計量皿に代えて前記電子天秤本体に取り付け可能であり、
前記側壁には、大開口部の面積より小さい面積の小開口部と当該小開口部を開閉可能とする小開口部開閉部材とが形成されているとともに、
前記取付部付小計量皿を前記電子天秤本体に取り付けた状態において、前記小計量皿は、前記風防の内部で小開口部近傍に配置されることを特徴とする電子天秤。 It has an upper wall and a side wall provided downward from the peripheral edge of the upper wall, and a large opening and a large opening opening / closing member capable of opening and closing the large opening are formed on the side wall. A windshield,
An electronic balance body having a weighing mechanism;
A large weighing pan having a mounting surface on which the measured object is placed, and a large weighing pan with mounting portion having a mounting portion which can be removably mounted to the upper surface of the electronic balance main body,
An electronic balance in which a large weighing pan is arranged inside the windshield by placing the windshield on the electronic balance body from above,
A small weighing pan having a mounting surface smaller than the area of the mounting surface of the large weighing pan, a mounting portion that can be attached to and detached from the upper surface of the electronic balance body, and the small weighing pan and the mounting portion have a predetermined length. And a small weighing pan with a mounting portion having a connecting member connected in the horizontal direction at
The mounting portion small weighing pan can be attached to the electronic balance body instead of the mounting portion large weighing pan,
The side wall is formed with a small opening having an area smaller than the area of the large opening and a small opening opening / closing member capable of opening and closing the small opening,
In a state where the small pan with the mounting portion mounted on the electronic balance main body, said small weighing pan, electronic balance, wherein the benzalkonium arranged small openings near inside of the windshield.
前記右側壁に、前記大開口部と大開口部開閉部材とが形成されていることを特徴とする請求項１〜請求項３のいずれかに記載の電子天秤。
The upper wall is a quadrangle, and the side wall has a front side wall, a rear side wall, a right side wall, and a left side wall,
The electronic balance according to any one of claims 1 to 3, wherein the large opening and a large opening opening / closing member are formed in the right side wall.
Priority Applications (1)
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| JP2009091255A JP5195596B2 (en) | 2009-04-03 | 2009-04-03 | electronic balance |
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| JP2009091255A JP5195596B2 (en) | 2009-04-03 | 2009-04-03 | electronic balance |
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| JP5195596B2 true JP5195596B2 (en) | 2013-05-08 |
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| JPS61210914A (en) * | 1985-03-15 | 1986-09-19 | Shinko Denshi Kk | Composite scale |
| JPH0351327U (en) * | 1989-09-26 | 1991-05-20 | ||
| JPH0943041A (en) * | 1995-08-02 | 1997-02-14 | A & D Co Ltd | Wind-proof structure of electronic balance |
| EP1715312B1 (en) * | 2005-04-19 | 2011-06-22 | Mettler-Toledo AG | Wind protection for a balance. |
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