JPS6065879A - Automatic door closing apparatus - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明は組立式低温庫等に設けられた扉の自動閉扉装置
に関し、特に閉扉時に扉の衝撃を柔らげる自動閉扉装置
に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an automatic door-closing device for a door installed in a prefabricated low-temperature refrigerator, and more particularly to an automatic door-closing device that softens the impact of the door when the door is closed.

（ロ）従来技術 以下、特公昭５２−３０９２０号公報の自動閉扉装置（
以下従来例という）について説明する。(b) Prior art Below, the automatic door closing device of Japanese Patent Publication No. 52-30920 (
(hereinafter referred to as a conventional example) will be explained.

従来例は扉の上端に固定さｎた取付枠と、この取付枠に
短片側の一端が枢着さｎたＬレバーと、ピストン軸を前
記Ｌレバーの折曲点に又シリンダーの下端を取付枠にそ
れぞれ回動自在に枢着すると共に、シリンダー内に設け
た発条により前記ピストンは下方へ抑圧さ１するダッシ
ュポット等を備え、扉を開けるときには壁枠に取付けら
れたフックグレートによりＬレバーを発条に抗して回動
さセ、前記Ｌレバーの折曲点の軸心が取付枠と、シリン
ダー及びＬレバーの２つの枢看点とを結ぶ−直線上の死
点を越したとぎ係止し、又、扉を閉める時は閉止寸前フ
ックプレートにより前記Ｌレバーを反対に回動させ、Ｌ
レバー折曲点の軸心が前記死点を越えて前記発条により
復帰する際、ダラシ−ホントを作用させる自動閉扉装置
であり、扉の閉止寸前に扉の閉止速度を減速させ、扉を
静穏に閉止できる。The conventional example includes a mounting frame fixed to the upper end of the door, an L lever with one end of the short side pivoted to this mounting frame, a piston shaft mounted at the bending point of the L lever, and the lower end of the cylinder mounted. Each piston is rotatably attached to the frame, and is equipped with a dashpot, etc., which suppresses the piston downward by a spring provided in the cylinder, and when opening the door, the L lever is pressed by a hook grate attached to the wall frame. When the L lever is rotated against the spring, the axis of the bending point of the L lever connects the mounting frame with the two pivot points of the cylinder and the L lever - it is locked once it passes the dead center on the straight line. Also, when closing the door, rotate the L lever in the opposite direction using the hook plate just before the door closes.
When the axis of the lever bending point exceeds the dead center and returns due to the spring, this is an automatic door-closing device that applies a Darashi-hont, which slows down the closing speed of the door just before the door closes, making the door quiet. Can be closed.

しかし乍ら、第１図に示した如（前記自動閉扉装置（１
）は耐久性等を考慮してシリンダー内部からの油漏れ等
を防止するために縦に取り付けられ、その取付位置は組
立式低温庫（２）に設けられたＲ（３）の上端部になる
。従って扉下方の締結力が弱く、この締結力を強化する
ために例えば扉の中央部に自動閉扉装置（１）とは別の
係止金具（４）等を設ける必要が発生していた。又、係
止金具（４）に把手（４）が形成されていないときには
外側から扉を開放するときのために、自動閉扉装置（１
）の他に、さらに把手を扉の適所に取り付ける必要があ
り、別の係止金具の取り付けと共に、扉の取付作業は極
めて煩雑になると共に部品点数も増加し、製造コストの
増加を招いていた。又、自動閉扉装置を必要とする扉と
、そうでない扉とを分けて提供する必要があり、製造作
業の一貫性を保つことはできなかった。However, as shown in Figure 1 (the automatic door closing device (1)
) is installed vertically to prevent oil leakage from inside the cylinder, considering durability, etc., and its installation position is at the upper end of R (3) provided in the prefabricated low temperature refrigerator (2). . Therefore, the fastening force at the bottom of the door is weak, and in order to strengthen this fastening force, it is necessary to provide, for example, a locking fitting (4) in the center of the door that is separate from the automatic door closing device (1). In addition, when the handle (4) is not formed on the locking metal fitting (4), an automatic door closing device (1) is installed in order to open the door from the outside.
), it was also necessary to attach the handle to the appropriate location on the door, and along with the installation of another locking metal fitting, the door installation work became extremely complicated and the number of parts increased, leading to an increase in manufacturing costs. . Furthermore, it is necessary to separately provide doors that require an automatic closing device and doors that do not, making it impossible to maintain consistency in manufacturing operations.

ｅ−１発明の目的 本発明は扉を閉じたときの衝撃及び衝撃音を大幅に減少
することは勿論、自動閉扉装置２扉の締結が確実になる
扉の側縁中央部等の適所に取り付は可能とすると共に、
前記自動閉扉装置に把手を取り付け、他の係止金具等を
廃止して部品点数の削減及び作業効率の向上を図り組立
式低温庫等の総合的な製造コストの削減を図ることを目
的とする。e-1 Purpose of the Invention The present invention not only significantly reduces the impact and impact noise when the door is closed, but also has an automatic door-closing device installed at an appropriate location such as the center of the side edge of the door to ensure the fastening of the door. It is possible to attach
The purpose is to reduce the number of parts and improve work efficiency by attaching a handle to the automatic door-closing device and eliminating other locking fittings, thereby reducing the overall manufacturing cost of assembled low-temperature refrigerators, etc. .

に）発明の構成 本発明は組立式低温庫の側壁に形成された開口を開閉自
在に閉塞する扉に固定された本体と、該本体と対向して
側壁適所に取り付けられ前記本体と係止する受金具とを
備え、扉を閉じたとき自動的に扉を閉じる自動閉扉装置
において、抑圧装置が設けられ把手が備えられた本体と
、側壁開口の周囲適所に固定され先端に前記本体の当接
部が当　′接して係止される係止部が形成された受金具
とにより自動閉扉装置を構成し、扉を閉じたときの衝撃
をなくシ、この自動閉扉装置を扉の適所に取付可能とし
て扉の締結を確実にすると共に他の係止金具を廃止して
部品点数の削減及び扉を設置する際の作業効率の向上を
図り、組立式低温庫等の総合的な製造コストの削減を図
ったものである。B) Structure of the Invention The present invention includes a main body fixed to a door that is formed in a side wall of a prefabricated low-temperature refrigerator to open and close the opening, and a main body that is attached to an appropriate position on the side wall facing the main body and locked with the main body. An automatic door-closing device that automatically closes the door when the door is closed, comprising: a main body provided with a suppression device and a handle; and a main body fixed at a suitable position around a side wall opening and abutting the main body at a tip. The automatic door-closing device is composed of a receiving bracket with a locking portion that is locked when the two parts come into contact with each other, and the automatic door-closing device can be installed in an appropriate position on the door to eliminate shock when the door is closed. In addition to ensuring the fastening of the door, other locking hardware is eliminated to reduce the number of parts and improve work efficiency when installing the door, reducing overall manufacturing costs for assembled low-temperature refrigerators, etc. It was planned.

（ホ）実施例 以下、第２図乃至第５図に基づいて本発明の一実施例を
説明する１゜ （２）は複数の断熱壁体（２）を連結して構成された組
立式低温庫で、側壁（２ａ）に形成された開口（５）は
開閉自在な扉（３）により閉塞されている。（６）、（
力は扉（３）の−側縁の上部及び下部に取り付けられた
上下回動部材で、開口（５）の−側縁には前記上下回動
部材（６）、（力と係合する上下係合部材（８）、（９
）が取り付けろｎで（゛・る。又、Ｑｌは本発明に係る
自動閉扉装置（以下本発明閉扉装置という）で、扉（３
）の側縁略中夫に固定された本体（ＩＯＡ）と、本体（
１０Ａ）と＋Ｉ：Ｉ醗つ１イ閂ロｌ悶＼ハ１日１１海畝
山力１項Ｎｒｒ田ｑ弐引ナー辱金具（ＩＯＢ）とから構
成されている。本体（１０Ａ）は伸びる方向すなわち第
４図の矢印的）方向へ力が働くロッド０ｚ及びロッドα
２の一端が内部に、挿入され窒素ガス等のガスが注入さ
れたシリンダ０３）等から構成されたガススプリングで
ある抑圧装置（１４）と略り字状に形成され押圧装置（
１４ｊの一端すなわちロッドａ２１の先端と回動自在に
一端すなわち一方の腕（１５Ａ）の先端部とがロッド枢
着ピン（１６）により係止され他端すなわち他方の腕（
１５Ｂ）の先端当接部に回動自在な例えば硬質樹脂製の
ローラ（２）がローラー枢着ピン（Ｒ）により取り付け
られた腕レバー０５１と、腕レバー０５）の一方の腕（
１５Ａ）及び押圧装置０４）を被覆すると共に抑圧装置
α４）の一端すなわちシリンダα３）の先端及び腕レバ
ー０９の一方の腕（１５Ａ）略中央部がシリンダ枢着ピ
ン（１７）及び腕レバー枢着ピン（１８）を介して回動
自在に支持され前記扉（３）の外面側縁に基部（１９Ａ
）がビス（イ）・・・・・・により固定されたケース部
材ａ９と、このケース部材（１傷にビス（２１１（２υ
により固定された把手０功とから構成されている。又、
受金具（ＩＯＢ）は開口（５）が形成された側壁（２ａ
）にビス゛（２３）、（２３）により固定された支持部
材（２４）と、この支持部材の先端に例えば溶接により
固定され本体（ＩＯＡ）方向に開口□□□が向ざ゛、底
部（２６）に扉（３）方向へ傾めに延びた係止片し６）
が形成された係止部材（２７）とから構成されている。(E) Example Hereinafter, an example of the present invention will be explained based on FIGS. 2 to 5. 1゜(2) is an assembly type low temperature construction constructed by connecting a plurality of heat insulating walls (2). In the warehouse, an opening (5) formed in the side wall (2a) is closed by a door (3) that can be opened and closed. (6), (
The force is provided by vertically moving members attached to the upper and lower parts of the -side edge of the door (3), and the vertically moving member (6), which engages with the force, is attached to the -side edge of the opening (5). Engagement members (8), (9
) is the mounting slot n(゛・ru. Also, Ql is the automatic door closing device according to the present invention (hereinafter referred to as the door closing device of the present invention), and the door (3
) and the main body (IOA) fixed to the side edge of the main body (IOA).
10A) and +I: I 1 I 1 I RO l agony \ 1 1 day 1 1 sea ridge power 1 term Nrr field 2 puller insult metal fittings (IOB). The main body (10A) has a rod 0z and a rod α that exert force in the extending direction, that is, in the direction indicated by the arrow in Fig. 4.
One end of 2 is formed into an abbreviated-shaped pressing device (14), which is a gas spring composed of a cylinder 03) inserted into the interior and injected with a gas such as nitrogen gas.
14j, that is, the tip of the rod a21, and one end, that is, the tip of one arm (15A), are rotatably locked by the rod pivot pin (16), and the other end, that is, the tip of the other arm (15A)
The arm lever 051 has a rotatable roller (2) made of, for example, hard resin attached to the tip abutment part of the arm lever 05) by means of a roller pivot pin (R), and one arm of the arm lever 05) (
15A) and the pressing device 04), and one end of the suppressing device α4), that is, the tip of the cylinder α3) and the approximate center of one arm (15A) of the arm lever 09 are connected to the cylinder pivot pin (17) and the arm lever pivot. A base (19A) is rotatably supported via a pin (18) and is attached to the outer side edge of the door (3).
) is fixed with screws (A)...... case member a9, and this case member (with screws (211 (2υ)
It consists of a handle fixed by a handle. or,
The receiving bracket (IOB) has a side wall (2a) in which an opening (5) is formed.
) is fixed to the support member (24) by screws (23), (23), and the bottom part (26 ) has a locking piece extending obliquely toward the door (3) 6)
The locking member (27) is formed with a locking member (27).

以下、上記本発明閉扉装置の動作を説明する。Hereinafter, the operation of the door closing device of the present invention will be explained.

閉じである扉（３）を把手（２ツに千ンかけ引き開放さ
せるとき、受金具（ＪＯＢ）の係止部材（２７）内にロ
ーラ■が保持され、腕レバー枢着ピン０８）を支Ａとし
てロッド（１２＋をシリンダ（１３）の抑圧に反してシ
リンダ（１３１内へ押し込みながら腕レバー（１５）は
矢印儲にて示したように回動する。腕レバー（１５）の
回動に伴いロッド枢着ビン（１６）も一方へ回動し、ロ
ッド枢着ピン（１６）が腕レバー枢着ピン（１８１とシ
リンダ枢着ビン（Ｉ７）とを結ぶ一点鎖線（２！Ｊ）上
の死点（２９）を越えたとぎ受金具（ＩＯＢ）の係上部
材（２７）とローラ（１１）との係合がはずれＪｊＰ（
３１は開放状態となる。尚、腕レバー（１５１の回動は
ロッド枢着ビンａ６）が死点（２９）ｙ越えろと共にロ
ーラ…）が受金具（ＩＯＢ）から外れ、ローラ（旬が扉
（３）の■１１］端面（３１に当接したとぎ停止する。When the closed door (3) is pulled open by the two handles, the roller ■ is held in the locking member (27) of the receiving bracket (JOB) and supports the arm lever pivot pin 08. As A, the arm lever (15) rotates as shown by the arrow while pushing the rod (12+) into the cylinder (131) against the pressure of the cylinder (13).As the arm lever (15) rotates, The rod pivot pin (16) also rotates in one direction, and the rod pivot pin (16) is attached to the dotted line (2!J) connecting the arm lever pivot pin (181) and the cylinder pivot pin (I7). When the point (29) is exceeded, the engagement member (27) of the interlocking bracket (IOB) and the roller (11) are disengaged and JjP (
31 is in an open state. In addition, when the arm lever (151) rotates, the rod pivot pin a6) crosses the dead center (29)y, and the roller...) comes off from the bracket (IOB), and the roller (151) comes off the end face of the door (3). (The machine stops when it comes into contact with 31.

又、扉（３）を開放状態から閉じるとぎには、扉（３）
の回動によりローラ（旬が受金具（ＩＯＢ）の係止片（
２６）と当接し、腕レバー（１５１は扉（３）を開放す
るときとは逆にロッドａ２の押圧に反して回動し、ロッ
ド枢着ピン（１６）が他方へ回動して死点（２９）を越
えると腕レバー（１５）はロッド鰺の矢印側方向への押
正により自動的に回動し、本体（１０Ａ）のローラ（８
）は係止部材（５）の内部へ入っていき、　！（３）は
自動的に回動してバネ部材（９）のロッドσ２の押圧に
より確実に閉止される。Also, when closing the door (3) from the open state, the door (3)
The rotation of the roller (locking piece of the IOB)
26), the arm lever (151) rotates against the pressure of rod a2, which is the opposite to when opening the door (3), and the rod pivot pin (16) rotates to the other side, reaching the dead center. (29), the arm lever (15) automatically rotates by pushing the rod in the direction of the arrow, and the roller (8) of the main body (10A) is rotated automatically.
) enters the locking member (5), and ! (3) automatically rotates and is reliably closed by the pressure of the rod σ2 of the spring member (9).

従って、一般の係止金具（ラッチ）のように扉を強く押
圧して閉めるか、係止金具の係合部を動作させながら扉
を閉じる必要はなく、扉（３）を軽く押圧するだけで押
圧装置０沿の押圧力により確実に扉（３）を閉じること
ができ、又、扉（３）を閉じるとぎ本体（ＩＯＡ）のロ
ーラ（Ｒ）と受金具（ＩＯＥＩ）との当接係合が始ると
まず腕レバー０９の回動によるロッド（１２の押圧によ
り扉（３）の閉速度は極めて遅くなり、例えば手Ｚ扉（
３）と側壁（２ａ）との間に挾んだとしても手に傷を負
うことを確実に防止することができる。。Therefore, there is no need to forcefully press the door to close it like with a general latch, or to close the door while operating the engagement part of the latch, but simply press the door (3) lightly. The door (3) can be reliably closed by the pressing force along the pressing device 0, and the contact engagement between the roller (R) of the knife body (IOA) that closes the door (3) and the receiving metal fitting (IOEI) When this starts, the closing speed of the door (3) becomes extremely slow due to the pressure of the rod (12) caused by the rotation of the arm lever 09. For example, when the door (3) is closed by hand (
3) and the side wall (2a), injury to the hand can be reliably prevented. .

さらに押圧装置（１４）のロッド鰺のストロークは太き
（、ロッド枢着ビン（Ｌ６）と腕レバー枢着ピン（１８
（との距離７太ぎくと１ｌ１１．ｒ本体Ｃｌ０Ａ）のロ
ーラ（２）と係止部材（２７ｊとの締結力は大きくなり
、又、本発明閉扉装置は扉（３）の開放側ｊの側端部略
中央等に固５月することρ・でき前記締結力を扉（３）
の周縁全体に均一に働かせることができるため、扉（３
）のよじれ、鼓形等を防止できると共に扉（３）全体を
確実に閉じた状態に保持することかでさ、Ｍ＝　（３）
の開閉時に使用される把手（２２は予め本体（１０Ａ）
のケース（１９）に固定されているため、把手ｉ／ｃよ
り扉（３）の開閉乞容易に行うことかでざると共に本発
明閉扉装置の池に係止金具及び把手を取り付ける必要は
なく、ｆτＢ品点数及び取付作業時間の大幅な削減を図
ることができ、製造コストの総合的な削減を図ることが
できる。Furthermore, the stroke of the rod of the pressing device (14) is thick (rod pivot pin (L6) and arm lever pivot pin (18).
(If the distance between The tightening force can be applied to the center of the edge of the door (3).
The door (3
) can be prevented from twisting, drum-shaped, etc., and the entire door (3) can be held securely closed, M= (3)
(22 is the main body (10A)
Since it is fixed to the case (19) of the door (3), it is easy to open and close the door (3) from the handle I/C, and there is no need to attach a locking fitting or a handle to the door closing device of the present invention. It is possible to significantly reduce the number of fτB products and the installation work time, and it is possible to achieve a comprehensive reduction in manufacturing costs.

又、本発明自動閉扉装置を従来の係止金具を取り付けて
いた位１ｉｔに取付Ｉｆ’を造を共通化しＣ取り付ける
ことができ、本発明自動閉扉装置を取り付ける扉と係止
金具を取りイ」ける扉との互撲性を持たせることがでさ
、扉の製造コストの−１−の削減を図ることもできる。In addition, the automatic door-closing device of the present invention can be installed in one unit by standardizing the structure of the conventional locking metal fittings, and the door and locking metal fittings to which the automatic door-closing device of the present invention is attached can be removed. By making the door compatible with other doors, the manufacturing cost of the door can be reduced by -1-.

尚、一般の貯蔵庫又は建物等の扉に不発明に係る自動閉
扉装置を設けることにより上記実施例と同様な作用効果
を得ることができる。Incidentally, by providing the automatic door closing device according to the invention on the door of a general storage room or building, the same effects as in the above embodiment can be obtained.

又、押圧装置α４）’ａ？ロッド０２）とシリンダα３
）とを逆にしてロッド枢着ビン０（ｊ）にシリンダα３
）の端部を回動自在に枢着し、シリンダ枢着ビン（１７
）にロッド（１２１の端部を枢着しても上記実施例と同
様な作用効果を得ることかでさ、さらに、抑圧装置に例
えばバネ等の力により押圧力が働くものを用いても同様
な作用効果を得ることができる。又、抑圧装置α４）に
引く方向へ力が働く他の抑圧装置を用い、他の押圧装置
の腕１／バー住５）側光端部を腕レバーａ９の略中央部
適所に回動自在に枢着し、腕レバー（１５）のロッド枢
着ピンα６）側の端部をケース部材（Ｌ９）の適所に回
動自在に枢着し、他の押圧装置の引く力を利用した本体
に把手を取り付けても前記実施例と同様な作用効果を得
ることかでざる。Also, the pressing device α4)'a? Rod 02) and cylinder α3
) and attach cylinder α3 to rod pivot pin 0(j).
) is rotatably connected to the end of the cylinder pivot pin (17).
) The end of the rod (121) can be pivotally mounted to obtain the same effect as in the above embodiment.Furthermore, the same effect can be obtained by using a suppressing device that exerts a pressing force by the force of a spring or the like. In addition, by using another suppressing device that applies a force in the pulling direction to the suppressing device α4), the arm 1/bar housing 5) side light end of the other pressing device is connected to the arm lever a9. The end of the arm lever (15) on the rod pivot pin α6) side is rotatably connected to the appropriate position of the case member (L9), and other pressing devices Even if the handle is attached to the main body using the pulling force of the handle, the same effect as in the above embodiment can be obtained.

（へ）発明の効果 本発明は扉に固定され抑圧装置を備えた不休と、側壁に
設けられ該本体の一部と前記扉を叩じたとき係合する受
金具とを備え、前記扉を閉じるとぎ前記本体と前記受金
具とが当接及び係合して前記押圧装置の力により静穏に
且つ自動的に前記扉を閉じる自動閉扉装置の前記本体に
、把手を予め設けたものであるから、前記自動閉扉装置
Ｚ扉の締結が確実になる扉及び側壁の適所に取り付ける
ことができ、他の係止金具等を廃止して部品点数の削減
及び作業時間の短縮を図り、組立式低温庫等の総合的な
製造コストの削減を図ることができる。(f) Effects of the Invention The present invention includes a locking device fixed to a door and equipped with a suppression device, and a receiving metal fitting provided on a side wall that engages with a part of the main body when the door is struck, A handle is provided in advance on the main body of the automatic door-closing device that closes the door quietly and automatically by the force of the pressing device when the main body and the receiving metal fitting come into contact and engage with each other. , the automatic door closing device Z can be installed at the appropriate location on the door and side wall to ensure the fastening of the door, and other locking fittings are eliminated to reduce the number of parts and work time. It is possible to reduce overall manufacturing costs.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来例、第２図乃至第５図は本発明の一実施例
を示し、第１図は従来の自動閉扉装置を備えた組立式低
温庫の部分斜視図、第２図は本発明に係る自動閉扉装置
を備えた組立式低温庫の部分斜視図、第３図は自動閉扉
装置本体の扉を開放したときの正面図、第４図は第２図
に示した自動閉扉装置本体を備えた組立式低温庫の要部
断面図、第５図は扉を閉じたときの第４図と同断面の断
面図である。 （２）・・・組立式低温庫、　（２）・・・断熱壁体、
　（３）・・・扉、（５）・・・開口、　←Ｑ・・・自
動閉扉装置、（１０Ａ）・・・本体、（ＩＯＢ）・・・
受金具、　０４）・・・押圧装置、　（１５）・・・腕
レバー、　α９・・・ケース部材、　０２・・・把手、
　０６・・・係止部。Fig. 1 shows a conventional example, Figs. 2 to 5 show an embodiment of the present invention, Fig. 1 is a partial perspective view of an assembly type low temperature refrigerator equipped with a conventional automatic door closing device, and Fig. 2 is a main A partial perspective view of a prefabricated low-temperature refrigerator equipped with an automatic door-closing device according to the invention, FIG. 3 is a front view of the automatic door-closing device main body when the door is opened, and FIG. 4 is the automatic door-closing device main body shown in FIG. 2. FIG. 5 is a cross-sectional view of the main parts of a prefabricated low-temperature refrigerator equipped with the same structure as FIG. 4 when the door is closed. (2)...Assembled low temperature storage, (2)...Insulating wall,
(3)...door, (5)...opening, ←Q...automatic door closing device, (10A)...main body, (IOB)...
Bracket, 04)...Press device, (15)...Arm lever, α9...Case member, 02...Handle,
06...Locking part.

Claims (1)

【特許請求の範囲】 １、複数の断熱壁体な連結することにより構成された組
立式低温庫等の側壁に形成された開口を開閉自在に閉塞
する扉に固定され抑圧装置を備えた本体と、該本体と対
応した側壁適所に固定され、前記本体の一部と係合する
受金具とを備え、前記扉を閉じるとぎ、前記本体と前記
受金具とが当接して前記抑圧装置の力により静穏に且つ
自動的に該扉を閉じる自動閉扉装置において、前記本体
は前記扉を開閉するとぎ使用される把手を備えたことを
特徴とする自動閉扉装置。 ２、前記本体は前記抑圧装置と、前記抑圧装置の一端と
回動自在に適所が枢着され外側先端に前記受金具と係合
する当接部が形成された腕レバーと、前記腕レバー及び
押圧装置を覆うと共に前記押圧装置の他端及び前記腕レ
バーの適所な回動自在に支持し前記把手カー固定され前
記扉の外面周囲の適所に固定されたケース部材を備えた
ことな特徴とする特許請求の範囲第１項記載の自動閉扉
装置。[Scope of Claims] 1. A main body equipped with a suppression device fixed to a door that freely opens and closes an opening formed in a side wall of a prefabricated low-temperature refrigerator constructed by connecting a plurality of heat-insulating wall bodies; , a receiving metal fitting fixed to a proper position on a side wall corresponding to the main body and engaging with a part of the main body, and when the door is closed, the main body and the receiving metal fitting come into contact with each other and the force of the suppressing device is applied. An automatic door-closing device for silently and automatically closing the door, wherein the main body includes a handle used for opening and closing the door. 2. The main body includes the suppressing device, an arm lever that is rotatably pivoted at a suitable position to one end of the suppressing device and has an abutment portion formed at an outer tip to engage with the receiving fitting, and the arm lever and The present invention is characterized by comprising a case member that covers the pressing device, supports the other end of the pressing device and the arm lever so that they can rotate at appropriate positions, is fixed to the handle car, and is fixed at appropriate positions around the outer surface of the door. An automatic door closing device according to claim 1.