JP5184143B2 - lift device - Google Patents

lift device Download PDF

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Publication number
JP5184143B2
JP5184143B2 JP2008044965A JP2008044965A JP5184143B2 JP 5184143 B2 JP5184143 B2 JP 5184143B2 JP 2008044965 A JP2008044965 A JP 2008044965A JP 2008044965 A JP2008044965 A JP 2008044965A JP 5184143 B2 JP5184143 B2 JP 5184143B2
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pulley
detection
spring
spring member
suspension
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JP2009202977A (en
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昌広 桐ヶ谷
健一郎 林
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/36Hoisting or lowering devices, e.g. for maintenance
    • F21V21/38Hoisting or lowering devices, e.g. for maintenance with a cable

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  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To achieve downsizing of a lifting device which superior in safety. <P>SOLUTION: This lifting device is provided with: a spring member for supporting a pulley 5 from the downside; an overload detecting means stopping the rotation of a winding drum upon detection of the fact that the spring member is compressed and deformed due to the increase in the tension of a suspension member 3 and the pulley 5 is moved downward; and a slack-detecting means stopping the rotation of a winding drum 2, upon detection of the fact that the spring member is extended and deformed due to decrease in the tension of the suspension member 3 and the pulley 5 has moved downward; and the spring member is formed by arranging a plurality of spring members 35a, 35b with different spring constants in parallel. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、巻取ドラムの巻取回転および巻出回転によって昇降体を上下昇降させる昇降装置に関する。   The present invention relates to a lifting device that moves a lifting body up and down by winding and unwinding rotation of a winding drum.

従来、コンサートホールや体育館、コンベンションホール等の比較的天井の高い大きな構造物では、天井に装着された照明器具のメンテナンスを容易に行うために、照明器具の昇降装置が利用されている。昇降装置は、主として、照明器具が接続される昇降体と、昇降体を吊下支持する吊材と、吊材を介して昇降体を上下昇降させる巻取ドラムと、天井に固定され巻取ドラムを支持する固定体と、で構成される(例えば特許文献1、2)。   Conventionally, in a large structure with a relatively high ceiling such as a concert hall, a gymnasium, a convention hall, etc., an elevating device for the luminaire has been used to facilitate maintenance of the luminaire mounted on the ceiling. The lifting device mainly includes a lifting body to which a lighting fixture is connected, a suspension material that suspends and supports the lifting body, a winding drum that moves the lifting body up and down via the suspension member, and a winding drum that is fixed to the ceiling. (For example, Patent Documents 1 and 2).

吊材の長さは、昇降装置を構造物の天井等に設置する際に、同構造物の床面から天井までの距離に応じて適当な使用長さに設定され、これにより、昇降体は、照明器具が使用される天井付近に上昇させた位置と、照明器具のメンテナンスを行うため床面近くに下降させた位置と、の間で昇降移動可能となる。   When installing the lifting device on the ceiling of the structure, the length of the suspension material is set to an appropriate length depending on the distance from the floor surface to the ceiling of the structure. It is possible to move up and down between a position raised near the ceiling where the luminaire is used and a position lowered near the floor for maintenance of the luminaire.

ここで、吊材は巻取ドラムから巻き出され滑車に上掛けされて垂下されており、当該滑車は下側からバネ部材で支持されることにより、吊材の張力が増大するとバネ部材が圧縮変形されて滑車が下方へ移動し、逆に吊材の張力が減小するとバネ部材が伸張変形されて滑車が上方へ移動するようになっている。   Here, the suspension material is unwound from the take-up drum and is suspended on the pulley, and the pulley is supported by the spring member from below, so that the spring member is compressed when the tension of the suspension material increases. When the pulley is deformed to move downward and the tension of the suspension member is reduced, the spring member is stretched and deformed to move the pulley upward.

そして、吊材の張力増大によりバネ部材が圧縮変形されて滑車が下方へ移動したことを検知すると巻取ドラムの電動モータの停止させる過負荷検知手段と、吊材の張力減小によりバネ部材が伸張変形されて滑車が上方へ移動したことを検知すると巻き取りドラムの回転を停止させるたるみ検知手段と、をさらに備えて構成されている。   Then, when it is detected that the spring member is compressed and deformed due to an increase in the tension of the suspension member and the pulley moves downward, an overload detection means for stopping the electric motor of the take-up drum, and the spring member is reduced due to the decrease in the tension of the suspension member. It further comprises slack detecting means for stopping the rotation of the take-up drum when it is detected that the pulley has moved upward due to expansion and deformation.

したがって、両検知手段の検知によって、巻取ドラムによる吊材の巻取回転および巻出回転が停止されるので、昇降体に過負荷がかかる等して各吊材の張力が増大したり、各吊材が弛んだりする異常状態において、吊材の巻取回転および巻出回転が駆動停止されることとなり、安全性に優れるとともに、吊材の劣化が防止される。   Therefore, since the winding rotation and unwinding rotation of the suspension material by the winding drum are stopped by the detection of both detection means, the tension of each suspension material increases due to overloading on the lifting body, In an abnormal state in which the suspended material is loosened, the winding rotation and unwinding rotation of the suspended material are stopped, which is excellent in safety and prevents deterioration of the suspended material.

そのため、過剰負荷を検知するためには、大きな力でバネ部材が圧縮変形されることを要し、逆に、吊材の弛みを検知するためには、この吊材の微小な張力差に応じてバネ部材が伸張変形されることを要する。   Therefore, in order to detect an excessive load, it is necessary that the spring member is compressed and deformed with a large force. Conversely, in order to detect slack in the suspension material, it is necessary to respond to a small tension difference between the suspension materials. Therefore, the spring member needs to be stretched and deformed.

例えば、過剰負荷を確実に検知できるように、バネ部材のバネ定数を大きくすると、吊材の微小な張力変化程度では、バネ部材が伸縮変形しなくなって、吊材の弛みを検知し難くなる。逆に、微小な張力変化を確実に検知できるように、バネ部材のバネ定数を小さくすると、微小な荷重増加でもバネ部材は圧縮変形してしまい、大きな過剰負荷を正確に検知することができなくなる。すなわち、上記従来の技術で示した昇降装置にあっては、吊材の張力変化を異なるレベル各々で精度良く検知できず、過剰負荷及び弛みの両者を正確に検知できないという問題を生じる。   For example, if the spring constant of the spring member is increased so that an excessive load can be reliably detected, the spring member does not expand and contract at a slight change in tension of the suspension member, making it difficult to detect the slack of the suspension member. On the other hand, if the spring constant of the spring member is made small so that a minute change in tension can be detected reliably, the spring member will compress and deform even with a slight load increase, and a large overload cannot be detected accurately. . That is, in the lifting device shown in the above-described conventional technology, a change in tension of the suspension material cannot be accurately detected at each different level, and there arises a problem that both overload and slack cannot be accurately detected.

そこで、特許文献2に開示される昇降装置では、滑車を下側から支持するバネ部材は、バネ定数が大きいバネ部材と、バネ定数が小さいバネ部材と、が上下に直列に列べられて構成されている。   Therefore, in the lifting device disclosed in Patent Document 2, the spring member that supports the pulley from the lower side is configured such that a spring member having a large spring constant and a spring member having a small spring constant are lined up and down in series. Has been.

そのため、特許文献2に開示される昇降装置では、異なるレベルの吊材の張力変化が各々で精度良く検知され、安全性及び動作性に優れた昇降装置となる。
特開2002−104785号公報 特開2004−256279号公報
Therefore, in the lifting device disclosed in Patent Document 2, changes in tension of the suspension members at different levels are detected with high accuracy, and the lifting device is excellent in safety and operability.
JP 2002-104785 A JP 2004-256279 A

しかしながら、このようなバネ定数の異なる2つのバネ部材を直列に列べた構造では、バネ部材の配置方向に向けて装置のサイズが大きくなってしまう。   However, in such a structure in which two spring members having different spring constants are arranged in series, the size of the device increases in the arrangement direction of the spring members.

本発明は、上記従来技術における問題を解決するために為されたものであって、サイズの増大を抑制できる、安全性に優れた昇降装置の提供を目的とする。   The present invention has been made to solve the above-described problems in the prior art, and an object of the present invention is to provide a lifting device excellent in safety that can suppress an increase in size.

請求項1に記載の発明は、天井に回転自在に支持される巻取ドラムと、前記巻取ドラムから繰り出される吊材が上掛けされて当該吊材を下方向に向きを変えて垂下させる滑車と、前記吊材に吊下支持される昇降体と、を備え、前記巻取ドラムによる吊材の巻き取り/巻き出し回転によって前記昇降体を上下昇降させる昇降装置であって、前記滑車を下側から支持するバネ部材と、前記吊材の張力増大により前記バネ部材が圧縮変形して前記滑車が下方に移動したことを検知すると前記巻取ドラムの回転を停止させる過負荷検知手段と、前記吊材の張力減少により前記バネ部材が伸張変形して前記滑車が上方に移動したことを検知すると前記巻取ドラムの回転を停止させるたるみ検知手段と、を備え、前記バネ部材は、バネ定数の相違する複数のバネ部材が並列に配置されて構成されていることを特徴とするものである。 According to the first aspect of the present invention, there is provided a winding drum that is rotatably supported on the ceiling, and a pulley that hangs the suspension material drawn from the winding drum and changes the direction of the suspension material downward. And an elevating body supported by being suspended by the hoisting material, and an elevating device that moves the hoisting material up and down by winding / unwinding the hoisting material with the take-up drum, and lowering the pulley A spring member supported from the side, an overload detection means for stopping the rotation of the winding drum when detecting that the spring member is compressed and deformed due to an increase in tension of the suspension member and the pulley is moved downward; comprising a slack detecting means for said spring member to stop rotation of said winding drum and said sheave by expanding deformation detects that it has moved upward by the tension decreased Tsuzai, wherein the spring member is Ba Ne constant Of multiple different It is characterized in that the spring member is formed by arranging in parallel.

なお、前記吊材の張力増大により前記バネ部材が圧縮変形する際には、バネ定数の大きいバネ部材およびバネ定数の小さいバネで前記滑車を支持する一方で、前記吊材の張力減少により前記バネ部材が伸張変形する際には、バネ定数の大きいバネ部材が当接せずにバネ定数の小さいバネのみで前記滑車を支持するように、前記バネ定数の相違する複数のバネ部材が並列に配置されている。   When the spring member is compressed and deformed due to an increase in tension of the suspension member, the pulley is supported by a spring member having a large spring constant and a spring having a small spring constant, while the spring member is decreased due to a decrease in tension of the suspension member. When the member is extended and deformed, a plurality of spring members having different spring constants are arranged in parallel so that the spring member having a large spring constant does not abut and the pulley is supported only by a spring having a small spring constant. Has been.

請求項2に記載の発明は、請求項1に記載の昇降装置であって、前記過負荷検知手段は、前記滑車の下方移動に対応して変位する1以上の検知ドグと、当該検知ドグの変位に応じて押釦されるリミットスイッチと、を備えて構成されていることを特徴とするものである。   Invention of Claim 2 is the raising / lowering apparatus of Claim 1, Comprising: The said overload detection means is one or more detection dogs displaced according to the downward movement of the said pulley, The said detection dog's And a limit switch that is pushed in accordance with the displacement.

請求項3に記載の発明は、請求項1に記載の昇降装置であって、前記たるみ検知手段は、前記滑車の上方移動に対応して変位する1以上の検知ドグと、当該検知ドグの変位に応じて押釦されるリミットスイッチと、を備えて構成されていることを特徴とするものである。   Invention of Claim 3 is the raising / lowering apparatus of Claim 1, Comprising: The said slack detection means is one or more detection dogs displaced according to the upward movement of the said pulley, and the displacement of the said detection dog And a limit switch that is pushed in response to the above.

請求項1に記載の発明によれば、過負荷検知に適当なバネ定数の大きいバネと、たるみ検知に適当なバネ定数の小さいバネと、を設けることで、張力が増大した際においても、張力が減少した際においても、正確に変化を検知することができる。また、バネ定数の大きいバネと、バネ定数の小さいバネと、が並列に配置されているため、複数のバネが直列に配置される構造に比べて、装置を小型化できる。   According to the first aspect of the present invention, even when the tension is increased by providing a spring having a large spring constant suitable for overload detection and a spring having a small spring constant suitable for sagging detection, Even when the value decreases, the change can be accurately detected. Further, since the spring having a large spring constant and the spring having a small spring constant are arranged in parallel, the apparatus can be downsized as compared with a structure in which a plurality of springs are arranged in series.

請求項2に記載の発明によれば、検知ドグを介してリミットスイッチを押釦する構造であるため、リミットスイッチの配置レイアウトの自由度が高まる。   According to the second aspect of the present invention, since the limit switch is pushed through the detection dog, the degree of freedom in the layout of the limit switch is increased.

請求項3に記載の発明によれば、検知ドグを介してリミットスイッチを押釦する構造であるため、リミットスイッチの配置レイアウトの自由度が高まる。   According to the third aspect of the present invention, since the limit switch is pushed through the detection dog, the degree of freedom in the layout of the limit switch is increased.

以下、本発明の実施形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1〜13は本発明の一実施形態の昇降装置を示している。本実施形態の昇降装置は、図1に示すように、天井に固定される固定体1と、固定体1に支持された巻取ドラム2と、巻取ドラム2に巻き取られまたは巻き出される例えば金属製のワイヤーなどで構成される吊材3と、巻取ドラム2から巻き出した吊材3を上掛けして当該吊材3を下方向に向きを変えて垂下させる滑車5と、滑車5から垂下された吊材3に吊下支持される昇降体6と、を備えている。なお、この実施形態では、巻取ドラム2から繰り出された吊材3の先端は、固定体1に設けられた滑車4、5を経由し、さらに昇降体6に設けられた滑車7、8を経由して、最終的に固定体1の固定部9に固定されている。   1-13 has shown the raising / lowering apparatus of one Embodiment of this invention. As shown in FIG. 1, the lifting device of the present embodiment is fixed to the ceiling, the winding drum 2 supported by the fixing body 1, and the winding drum 2 is wound or unwound. For example, a suspension member 3 made of a metal wire, a pulley 5 for hanging the suspension member 3 unwound from the take-up drum 2 and hanging the suspension member 3 in a downward direction, and a pulley And an elevating body 6 that is suspended and supported by a suspension member 3 that is suspended from 5. In this embodiment, the tip of the suspension member 3 fed out from the winding drum 2 passes through pulleys 4 and 5 provided on the fixed body 1, and further has pulleys 7 and 8 provided on the lifting body 6. Via, it is finally fixed to the fixing part 9 of the fixed body 1.

巻取ドラム2を一方向に回転させると吊材3が巻取ドラム2に巻き取られて昇降体6が上昇し、巻取ドラム2を逆方向に回転させると吊材3が巻取ドラム2から巻き出されて昇降体6が下降する。   When the take-up drum 2 is rotated in one direction, the suspension material 3 is taken up by the take-up drum 2 and the elevating body 6 is raised. When the take-up drum 2 is rotated in the reverse direction, the suspension material 3 is turned into the take-up drum 2. The lifting body 6 is unwound and descends.

固定体1は、図2、図3に示すように、上方が開口する箱状に形成され、固定体1の底壁には、昇降体6を収容可能な収容凹部11が上方に向けて凹設されており、昇降体6を上昇させると当該収容凹部11内に昇降体6が嵌まり込むように収まり、昇降体6の揺動や回動が防止された安定状態で静止されることとなる。なお、固定体1は天井に取付固定されるものであるが、その際、天井面の下側に直付けされてもよく、天井面の上側に埋設されてもよい。   As shown in FIGS. 2 and 3, the fixed body 1 is formed in a box shape that opens upward, and an accommodation recess 11 that can accommodate the elevating body 6 is recessed upward on the bottom wall of the fixed body 1. And when the elevating body 6 is raised, the elevating body 6 fits in the receiving recess 11 and is stationary in a stable state in which the elevating body 6 is prevented from swinging or rotating. Become. In addition, although the fixed body 1 is attached and fixed to a ceiling, in that case, it may be directly attached to the lower side of a ceiling surface, and may be embed | buried under the ceiling surface.

本実施形態の昇降体6は、図示せぬ照明器具が取付接続されるものであり、巻取ドラム2による吊材3の巻取回転および巻出回転によって、昇降体6に取り付けられた照明器具を上下昇降できる。そのため、昇降体6を床面近くに下降させた位置では、照明器具のメンテナンス作業を安全且つ容易に行うことができる。   The lifting body 6 of the present embodiment is connected to a lighting fixture (not shown), and the lighting fixture attached to the lifting body 6 by the winding rotation and unwinding rotation of the suspension member 3 by the winding drum 2. Can be moved up and down. Therefore, the maintenance work of the lighting fixture can be performed safely and easily at the position where the elevating body 6 is lowered near the floor surface.

固定体1内には、図2に示すように、吊材3を巻き取るための巻取機構が収容されており、この巻取機構は、巻取ドラム2と、巻取ドラム2を回転させる可逆転型の電動モータ21と、電動モータ21の駆動軸の回転を巻取ドラム2に伝達する減速ユニット23と、を備えている。この場合、減速ユニット23は複数の歯車列でなり、電動モータ21から巻取ドラム2へと動力を伝達するが、巻取ドラム2の回転が電動モータ21に対して逆に伝達されるのを阻止するためのセルフロック機能を有している。   As shown in FIG. 2, a winding mechanism for winding the suspension member 3 is accommodated in the fixed body 1, and this winding mechanism rotates the winding drum 2 and the winding drum 2. A reversible electric motor 21 and a reduction unit 23 that transmits the rotation of the drive shaft of the electric motor 21 to the winding drum 2 are provided. In this case, the speed reduction unit 23 is composed of a plurality of gear trains and transmits power from the electric motor 21 to the winding drum 2, but the rotation of the winding drum 2 is transmitted to the electric motor 21 in reverse. It has a self-locking function to prevent it.

そして、固定体1内には、図2、3に示すように、巻取ドラム2の回転中において所定の状態になったことを検知すると巻取ドラム2の回転を自動的に停止させる自動停止機構30が収容されている。   As shown in FIGS. 2 and 3, in the fixed body 1, when it is detected that the winding drum 2 is in a predetermined state during rotation, the rotation of the winding drum 2 is automatically stopped. A mechanism 30 is accommodated.

(自動停止機構)
以下、自動停止機構30について主に図4〜図13を参照しつつより詳しく説明する。
(Automatic stop mechanism)
Hereinafter, the automatic stop mechanism 30 will be described in more detail with reference mainly to FIGS.

図4は自動停止機構の上方からみた斜視図、図5は下方からみた斜視図、図6は正面図、図7は左側面図、図8は下面図、図9は図6の正面図においてベース本体からブラケットおよび検知ドグを取り外した図である。   4 is a perspective view as viewed from above, FIG. 5 is a perspective view as viewed from below, FIG. 6 is a front view, FIG. 7 is a left side view, FIG. 8 is a bottom view, and FIG. 9 is a front view of FIG. It is the figure which removed the bracket and the detection dog from the base main body.

自動停止機構30は、図4〜図9に示すように、固定体1に固定されるベース31と、ベース31に回転自在に支持された前記滑車5と、前記ベース31に固定されたリミットスイッチ37、39と、前記ベース31に支持された複数の検知ドグ51、53、55、63と、を一体に組み立てて構成されている。   As shown in FIGS. 4 to 9, the automatic stop mechanism 30 includes a base 31 fixed to the fixed body 1, the pulley 5 rotatably supported by the base 31, and a limit switch fixed to the base 31. 37, 39 and a plurality of detection dogs 51, 53, 55, 63 supported by the base 31 are integrally assembled.

自動停止機構30のベース31は、図4に示すように、樹脂製のベース本体31aとベース本体31aに固定された金属製のブラケット31b、31cと組み合わせて構成されている。   As shown in FIG. 4, the base 31 of the automatic stop mechanism 30 is configured in combination with a resin base body 31a and metal brackets 31b and 31c fixed to the base body 31a.

ベース本体31aには、図9に示すように、バネ部材35a、35bを収容するバネ収容部34a、34bと、滑車5の回転軸である滑車軸33を片持ち支持する棚部32と、が形成されており、滑車軸33の一端33aが棚部32に支持されるとももに滑車軸33の他端33b側がバネ部材35a、35bにより下方から付勢支持されている。そのため、滑車軸33は、一端33aを支持する棚部32を中心にして他端33bが上下方向に回動可能となる(図10および図12参照)。これにより、吊材3を通じて滑車5に加わる下方向への力が大きくなると、滑車5が下方に移動し(図12参照)、逆に滑車5にかかる下方向への力が小さくなると滑車5が上方に移動することとなり(図10参照)、結果、吊材3の張力変化による衝撃がバネ部材35a、35bで緩衝される。なお、バネ部材35bの上端と滑車軸33との間には、後述する第1の検知板51のバネ座金部51bが介在しており、バネ部材35bの上端と滑車軸33とは直接接触していない。   As shown in FIG. 9, the base main body 31 a includes spring accommodating portions 34 a and 34 b that accommodate the spring members 35 a and 35 b, and a shelf portion 32 that cantileverally supports the pulley shaft 33 that is the rotation shaft of the pulley 5. The pulley shaft 33 is supported at one end 33a of the pulley shaft 33 by the shelf portion 32, and the other end 33b of the pulley shaft 33 is urged and supported from below by spring members 35a and 35b. Therefore, the pulley shaft 33 can be rotated in the up-down direction at the other end 33b around the shelf portion 32 that supports the one end 33a (see FIGS. 10 and 12). Accordingly, when the downward force applied to the pulley 5 through the suspension member 3 increases, the pulley 5 moves downward (see FIG. 12), and conversely, when the downward force applied to the pulley 5 decreases, the pulley 5 As a result, the impact due to the change in the tension of the suspension member 3 is buffered by the spring members 35a and 35b. A spring washer 51b of a first detection plate 51 described later is interposed between the upper end of the spring member 35b and the pulley shaft 33, and the upper end of the spring member 35b and the pulley shaft 33 are in direct contact with each other. Not.

本実施形態の自動停止機構30は、吊材3に過負荷がかかった際に巻取ドラム2の回転を停止させる過負荷検出手段と、吊材3がたるんだ際に巻取ドラム2の回転を停止させるたるみ検出手段を備えた構造であって、次に、これら過負荷手検出手段およびたるみ検出手段について、さらに図10〜図13を参照しつつより詳しく説明する。   The automatic stop mechanism 30 of the present embodiment includes an overload detection means for stopping the rotation of the winding drum 2 when the suspension member 3 is overloaded, and the rotation of the winding drum 2 when the suspension member 3 sags. Next, the overload hand detecting means and the sag detecting means will be described in more detail with reference to FIGS. 10 to 13.

(たるみ検知)
図10はたるみ検知を説明するために図6中の要部のみを図示した拡大図であり、図10(a)はたるみ検知前、図10(b)はたるみ検知時を示す図である。図11(a)はたるみ検知前、図11(b)はたるみ検知時を示す図7相当の図である。
(Sag detection)
FIG. 10 is an enlarged view showing only a main part in FIG. 6 for explaining the sag detection. FIG. 10A is a diagram before the sag detection, and FIG. 10B is a diagram showing the sag detection. FIG. 11A is a view corresponding to FIG. 7 showing a state before the sag is detected, and FIG.

たるみ検知手段は、昇降体6の下降中において、吊材3に加わる張力が所定値よりも小さくなったことを検知すると、昇降体6の下降を停止させるものであり、本実施形態のたるみ検知手段は、下降停止用のリミットスイッチ37と、検知ドグとしての検知板63と、を備えて構成されている。   When the slack detecting means detects that the tension applied to the suspension member 3 has become smaller than a predetermined value while the lifting body 6 is being lowered, the slack detecting means stops the descending of the lifting body 6. The means includes a limit switch 37 for lowering stop and a detection plate 63 as a detection dog.

具体的には、下降停止用のリミットスイッチ37は、図11に示すように、ブラケット31cを介してベース本体31aに固定されている。ブラケット31cには、検知ドグとしての検知板63が回転軸64を中心に回転自在に支持されている。検知板63の一方の回転端63aは、上述した滑車軸33の他端33bの上方に配置されており(図6、11参照)、滑車軸33の他端33bが上方へ向けて移動すると、図11(a)→(b)に示すように、検知板63の一方の回転端63aが押し上げられるようになっている。   Specifically, the limit switch 37 for lowering stop is fixed to the base body 31a via a bracket 31c as shown in FIG. A detection plate 63 as a detection dog is supported on the bracket 31c so as to be rotatable about a rotation shaft 64. One rotation end 63a of the detection plate 63 is disposed above the other end 33b of the pulley shaft 33 described above (see FIGS. 6 and 11), and when the other end 33b of the pulley shaft 33 moves upward, As shown in FIGS. 11A to 11B, one rotation end 63a of the detection plate 63 is pushed up.

また、この検知板33の一方の回転端63aの上方には、図11に示すように、下降停止用のリミットスイッチ37のヒンジレバー37cの回転自由端37dが設けられており、これにより、図11(a)→(b)に示すように、検知板63の一方の回転端63aが押し上げられると、ヒンジレバー37cが押し上げられてリミットスイッチ37のプランジャ37bが押釦されて、スイッチが入るようになっている。   Further, as shown in FIG. 11, a rotation free end 37d of the hinge lever 37c of the limit switch 37 for stopping the lowering is provided above the one rotation end 63a of the detection plate 33. 11 (a) → (b), when one rotation end 63a of the detection plate 63 is pushed up, the hinge lever 37c is pushed up, the plunger 37b of the limit switch 37 is pushed, and the switch is turned on. It has become.

このような構成により、たるみ検知手段は、以下のように動作する。   With such a configuration, the sag detection means operates as follows.

図10(a)→(b)に示すように、吊材3に加わる張力が減少して滑車軸33に加わる下方への力が減ると、滑車軸33の他端33bが上方へ移動する。すると、滑車軸33の他端33bが、図11(a)→(b)に示すように、回転軸64を中心に回転自在に設けられた検知ドグ63の一方の回転端63aを押し上げる。押し上げられた一方の回転端63aは、下降停止用のリミットスイッチ37のヒンジレバー37cを上方に押し上げ、当該リミットスイッチ37のプランジャ37bを押釦する。これにより、巻取ドラム2の電動モータ21への通電が停止され、巻取ドラム2の回転が停止する。   As shown in FIGS. 10A to 10B, when the tension applied to the suspension member 3 decreases and the downward force applied to the pulley shaft 33 decreases, the other end 33b of the pulley shaft 33 moves upward. Then, the other end 33b of the pulley shaft 33 pushes up one rotating end 63a of the detection dog 63 provided rotatably around the rotating shaft 64, as shown in FIGS. The one rotary end 63a pushed up pushes up the hinge lever 37c of the limit switch 37 for lowering and presses down the plunger 37b of the limit switch 37. Thereby, electricity supply to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

このようにたるみ検知では、吊材3に加わる張力が所定値未満に減少したときに昇降体6の下降を停止するため、例えば吊材3が途中で切断してしまい吊材3がたるんだ異常な状態や、例えば昇降体6が下降途中で障害物に乗り上げた異常な状態や、例えば昇降体6の下降時に昇降体6を作業員が受け止めて下降させる必要がない状態などに昇降体6を自動停止できる。なお、たるみ検知では、滑車軸33の他端33bが被検知部となる。   In this way, in the slack detection, when the tension applied to the suspension member 3 is reduced below a predetermined value, the elevating body 6 stops descending. For example, the suspension member 3 is cut halfway and the suspension member 3 is slackened. For example, the lifting body 6 may be moved to an abnormal state in which the lifting body 6 rides on an obstacle while the lifting body 6 is descending, or when the operator does not need to receive and lift the lifting body 6 when the lifting body 6 is lowered. Can stop automatically. In the sagging detection, the other end 33b of the pulley shaft 33 is a detected portion.

(過負荷検知)
図12は過負荷検知を説明するために図6中の要部のみを図示した拡大図であって、(a)は検知前を示し、(b)は過負荷時を示す図である。図13(a)は過負荷検知前、図13(b)は過負荷検知時を示す図8相当の図である。
(Overload detection)
FIGS. 12A and 12B are enlarged views illustrating only a main part in FIG. 6 in order to explain overload detection. FIG. 12A shows a state before detection, and FIG. 12B shows a state during overload. FIG. 13A is a diagram corresponding to FIG. 8 before the overload is detected, and FIG. 13B is a diagram corresponding to FIG.

過負荷検知手段は、昇降体6の上昇中において吊材3に加わる張力が所定値より大きくなったことを検知すると、昇降体6の上昇を停止するものである。具体的には、例えば昇降体6が何らかの障害物に引っかかったり、昇降体6を人為的に押さえたりすることで、吊材3の張力が増大することがあるが、このような場合に巻取ドラム2が回転しつづけると、吊材3ならびに当該吊材3を巻き取る巻取ドラム2の駆動モータ21に過負荷がかかることとなるため、過負荷検知手段によって、このような過負荷がかかった際に自動的に駆動モータ21を停止させて、当該駆動モータ21ならびに吊材3に過負荷がかかりつつけることを防止するものである。   When the overload detecting means detects that the tension applied to the suspension member 3 is larger than a predetermined value while the elevating body 6 is being raised, the overload detecting means stops the elevating body 6 from being raised. Specifically, for example, the tension of the suspension member 3 may increase when the lifting body 6 is caught by some obstacle or the lifting body 6 is artificially pressed. If the drum 2 continues to rotate, an overload is applied to the suspension member 3 and the drive motor 21 of the take-up drum 2 that winds up the suspension member 3. Therefore, such overload is applied by the overload detection means. In this case, the drive motor 21 is automatically stopped to prevent the drive motor 21 and the suspension member 3 from being overloaded.

本実施形態の過負荷検出手段は、上昇停止用のリミットスイッチ39と、複数の検知ドグ51、53、55と、を備えて構成されている。   The overload detection means of the present embodiment is configured to include a limit switch 39 for stopping and stopping, and a plurality of detection dogs 51, 53, and 55.

具体的に構造を説明すると、上昇停止用のリミットスイッチ39は、図4、5に示すように、ブラケット31bを介してベース本体31aに固定されている。つまり、このブラケット31bの固定板部41が、ベース本体31aの前壁面にネジにより固定されており、このブラケット31bの固定板部41から直角に立設された取付板部43に、リミットスイッチ39がネジにより固定されている。   More specifically, as shown in FIGS. 4 and 5, the rise stop limit switch 39 is fixed to the base body 31a via a bracket 31b. That is, the fixing plate portion 41 of the bracket 31b is fixed to the front wall surface of the base body 31a with screws, and the limit switch 39 is attached to the mounting plate portion 43 that is erected at a right angle from the fixing plate portion 41 of the bracket 31b. Is fixed with screws.

このブラケット31bの固定板部41と、ベース本体31aの前壁面と、の間には、第1の検知ドグとしての第1の検知板51がスライド自在に介在している(図6、9参照)。第1の検知板51は、図6、9に示すように、バネ部材35bに沿って延在し枠形状の板状本体部51aと、この板状本体部51aの上端から直角に立設されバネ部材35bの上端と滑車軸33との間に介在するバネ座金部51bと、板状本体部51aの中央開口51cの上端部から直角に立設された押圧片51dと、を備えて構成されている。このように、第1の検知板51のバネ座金部51bがバネ部材35b上端と滑車軸33との間に介在しているため、図10に示すようにバネ部材35bが伸張してバネ部材35bの上端が上昇すると、第1の検知板51全体が上昇し、逆に図12に示すようにバネ部材35bが圧縮してバネ部材35bの上端が下降すると、第1の検知板51全体が下降するようになっている。なお、第1の検知板51のバネ座金部51bと押圧片51dとは互いに逆向きに突設している。   A first detection plate 51 as a first detection dog is slidably interposed between the fixed plate portion 41 of the bracket 31b and the front wall surface of the base body 31a (see FIGS. 6 and 9). ). As shown in FIGS. 6 and 9, the first detection plate 51 extends along the spring member 35b and is erected at a right angle from the frame-shaped plate-like main body portion 51a and the upper end of the plate-like main body portion 51a. A spring washer portion 51b interposed between the upper end of the spring member 35b and the pulley shaft 33, and a pressing piece 51d erected at a right angle from the upper end portion of the central opening 51c of the plate-like main body portion 51a. ing. Thus, since the spring washer portion 51b of the first detection plate 51 is interposed between the upper end of the spring member 35b and the pulley shaft 33, the spring member 35b expands and the spring member 35b as shown in FIG. When the upper end of the first detection plate 51 rises, the entire first detection plate 51 rises. Conversely, as shown in FIG. 12, when the spring member 35b is compressed and the upper end of the spring member 35b is lowered, the entire first detection plate 51 is lowered. It is supposed to be. Note that the spring washer portion 51b and the pressing piece 51d of the first detection plate 51 protrude in opposite directions.

また、ブラケット31の固定板部41には、図4〜6に示すように、第2の検知ドグとしての第2の検知板53が、その回転軸54を中心に回転自在に取り付けられている。この第2の検知板53は、受圧片53cと、押圧片53a(図5参照)と、を備えて構成されている。受圧片53cは、図12に示すように第1の検知板51の押圧片51dが下降した際に当該押圧片51dにより押し下げられることで、第2の検知板53を回転軸54を中心に回転させるものである。一方、押圧片53aは、このように第2の検知板53が回転した際に、後述する第3の検知板55の受圧片55cを押して、当該第3の検知板55をスライドさせるものである(図12、13参照)。   Further, as shown in FIGS. 4 to 6, a second detection plate 53 as a second detection dog is attached to the fixed plate portion 41 of the bracket 31 so as to be rotatable around the rotation shaft 54. . The second detection plate 53 includes a pressure receiving piece 53c and a pressing piece 53a (see FIG. 5). As shown in FIG. 12, the pressure receiving piece 53c is pushed down by the pressing piece 51d when the pressing piece 51d of the first detecting plate 51 is lowered, so that the second detecting plate 53 rotates around the rotation shaft 54. It is something to be made. On the other hand, when the second detection plate 53 rotates in this way, the pressing piece 53a presses a pressure receiving piece 55c of a third detection plate 55 described later, and slides the third detection plate 55. (See FIGS. 12 and 13).

また、ブラケット31bの固定板部41の下端部からは、ベース本体31aの下面側に回り込むようにスライドガイド部45が直角に立設されており、このスライドガイド部45と、ベース本体31aの下面と、の間に、図13に示すように、第3の検知ドグとしての第3の検知板55が図中X方向にスライド自在に支持されている。この第3の検知板55には、図13に示すように、第2の検知板53の押圧片53aに押圧される受圧片55cが設けられている。   Further, a slide guide portion 45 is erected at a right angle from the lower end portion of the fixing plate portion 41 of the bracket 31b so as to wrap around the lower surface side of the base body 31a. The slide guide portion 45 and the lower surface of the base body 31a 13, as shown in FIG. 13, a third detection plate 55 as a third detection dog is supported to be slidable in the X direction in the drawing. As shown in FIG. 13, the third detection plate 55 is provided with a pressure receiving piece 55 c that is pressed by the pressing piece 53 a of the second detection plate 53.

そして、この第3の検知板55の本体部55aからく字状のカム部55bが略直角に立設されており、このカム部55bは、当該第3の検知板55が図中X方向にスライドした際に、リミットスイッチ39のヒンジレバー39cの回転自由端39dを押してリミットスイッチ39のプランジャ39bを押釦するようになっている。   A square cam portion 55b is erected at a substantially right angle from the main body portion 55a of the third detection plate 55, and the third detection plate 55 extends in the X direction in the figure. When sliding, the rotation free end 39d of the hinge lever 39c of the limit switch 39 is pushed to push the plunger 39b of the limit switch 39.

このような構成により、過負荷検知手段は、以下のように動作する。   With such a configuration, the overload detection means operates as follows.

何らかの原因で吊材3の張力が増大した場合、図12(a)→(b)に示すように、滑車5に下側に大きな力が加わり、滑車軸33の他端33b側が下降する。すると、図12(a)→(b)に示すように、バネ部材35a、35bが圧縮され、バネ部材35bの上端とともに第1の検知板51が下降する。このように第1の検知板51が下降すると、第1の検知板51の押圧片51dが、第2の検知板53の受圧片53cを押圧して下方に押し下げることで、第2の検知板53全体が回転軸54を中心に回転する。このように第2の検知板53が回転すると、図13(a)→(b)に示すように第2の検知板53の押圧片53aが第3の検知板55の受圧片55cを押し、これにより、第3の検知板55がX方向にスライドする。すると、第3の検知板55のカム部55bにより、上昇停止用のリミットスイッチ39のヒンジレバー39cが押されてプランジャ39bが押釦される。結果、巻取ドラム2の電動モータ21への通電が停止され、巻取ドラム2の回転が停止される。   When the tension of the suspension member 3 increases for some reason, as shown in FIGS. 12A to 12B, a large force is applied to the pulley 5 downward, and the other end 33b side of the pulley shaft 33 is lowered. Then, as shown in FIGS. 12A to 12B, the spring members 35a and 35b are compressed, and the first detection plate 51 is lowered together with the upper end of the spring member 35b. When the first detection plate 51 is lowered in this way, the pressing piece 51d of the first detection plate 51 presses the pressure receiving piece 53c of the second detection plate 53 and pushes it downward, so that the second detection plate The whole 53 rotates around the rotation shaft 54. When the second detection plate 53 rotates in this way, the pressing piece 53a of the second detection plate 53 pushes the pressure receiving piece 55c of the third detection plate 55 as shown in FIGS. As a result, the third detection plate 55 slides in the X direction. Then, by the cam portion 55b of the third detection plate 55, the hinge lever 39c of the limit switch 39 for stopping lifting is pushed and the plunger 39b is pushed. As a result, energization to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

このように過負荷検知手段は、昇降体6の上昇中において吊材3の張力が増大して吊材3および巻取ドラム2の電動モータ21に過負荷がかかった際に、当該過負荷がかかり続けることを防止できる。なお、過負荷検知では、滑車5の滑車軸33の他端33bが被検知部となる。   In this way, the overload detection means detects that the overload is applied when the tension of the suspension member 3 increases while the elevating body 6 is raised and the suspension motor 3 and the electric motor 21 of the winding drum 2 are overloaded. It can be prevented from continuing. In the overload detection, the other end 33b of the pulley shaft 33 of the pulley 5 serves as a detected portion.

(滑車軸の支持構造)
ここで本実施形態では、滑車軸33を下方からバネ部材で支持しているが、当該バネ部材35a、35bはバネ定数の相違したバネ部材35a、35bを水平方向に並列に配置したものである。なお、第1バネ部材35aの方が第2バネ部材35bよりもバネ定数が小さく設定されており、過負荷によって滑車軸33が下方に移動する際には第1バネ部材35aおよび第2バネ部材35bがともに圧縮変形されるとともに、負荷が減少して滑車軸33が上方に移動する際には第2バネ部材35bは滑車軸33を押し上げずに第1バネ部材35aのみで滑車軸33を押し上げるようになっている。
(Support structure of pulley shaft)
Here, in this embodiment, the pulley shaft 33 is supported by a spring member from below, but the spring members 35a and 35b are formed by arranging spring members 35a and 35b having different spring constants in parallel in the horizontal direction. . The first spring member 35a has a smaller spring constant than the second spring member 35b. When the pulley shaft 33 moves downward due to overload, the first spring member 35a and the second spring member When the load is reduced and the pulley shaft 33 moves upward, the second spring member 35b pushes up the pulley shaft 33 only by the first spring member 35a without pushing up the pulley shaft 33. It is like that.

このように、吊材3の弛み等による微小な張力変化に係る異常状態の場合には、バネ定数の小さなバネ部材35bの伸張変形による滑車5の移動をたるみ検知手段(37、63)が検知し、逆に、過負荷等による吊材3の過大な張力変化に係る異常状態の場合には、バネ定数の大きなバネ部材35aの圧縮変形による滑車5の移動を過負荷検知手段(39、51、53、55)が検知して、吊材3の張力変化を微小、過大の異なるレベル各々で精度良く検知することができる。そして、いずれの異常状態検知によっても、巻取ドラム2による吊材3の巻取回転および巻出回転が停止されるので、安全性が向上され、吊材3の弛みによる絡まりも防止されて動作性が確保される。   In this way, in the case of an abnormal state related to a slight change in tension due to slack of the suspension member 3 or the like, the slack detection means (37, 63) detects the movement of the pulley 5 due to the extension deformation of the spring member 35b having a small spring constant. On the contrary, in the case of an abnormal state related to an excessive tension change of the suspension member 3 due to an overload or the like, the overload detection means (39, 51) detects the movement of the pulley 5 due to the compression deformation of the spring member 35a having a large spring constant. , 53, 55), and the tension change of the suspension member 3 can be detected with high accuracy at different levels of fine and excessive. And by detecting any abnormal state, the winding rotation and unwinding rotation of the suspension member 3 by the winding drum 2 are stopped, so that the safety is improved and the entanglement due to the slack of the suspension member 3 is also prevented. Sex is secured.

また、本実施形態の昇降装置においては、バネ定数の大きいバネ部材35aと、バネ定数の小さいバネ部材35bと、が並列に配置されているため、複数のバネ部材35a、35bが直列に配置される構造に比べて、装置を小型化できる。   Further, in the lifting device of the present embodiment, the spring member 35a having a large spring constant and the spring member 35b having a small spring constant are arranged in parallel. Therefore, the plurality of spring members 35a and 35b are arranged in series. The device can be reduced in size compared to the structure.

以下、本実施形態の主な効果をまとめる。   The main effects of this embodiment will be summarized below.

(1)本実施形態の昇降装置は、滑車5を下側から支持するバネ部材35a、35bと、吊材3の張力増大によりバネ部材が圧縮変形して滑車5が下方に移動したことを検知すると、巻取ドラム2の回転を停止させる過負荷検知手段(39、51、53、55)と、吊材3の張力減少によりバネ部材が伸張変形して滑車5が上方に移動したことを検知すると、巻取ドラム2の回転を停止させるたるみ検知手段(37、63)と、を備えた昇降装置であって、バネ部材35a、35bは、バネ定数の相違する複数のバネ部材35a、35bが並列に配置されて構成されている。 (1) The lifting device according to the present embodiment detects that the pulley 5 is moved downward by the spring members 35a and 35b that support the pulley 5 from the lower side and the spring member compressively deformed due to the increased tension of the suspension member 3. Then, an overload detection means (39, 51, 53, 55) for stopping the rotation of the winding drum 2 and a detection that the pulley 5 has been moved upward due to the extension of the spring member due to the decrease in the tension of the suspension member 3 are detected. Then, it is a lifting device provided with slack detecting means (37, 63) for stopping the rotation of the take-up drum 2, wherein the spring members 35a, 35b have a plurality of spring members 35a, 35b having different spring constants. They are arranged in parallel.

そのため、本実施形態の昇降装置においては、過負荷検知に適当なバネ定数の大きいバネ部材35aと、たるみ検知に適当なバネ定数の小さいバネ部材35bと、を設けることで、張力が増大した際においても、張力が減少した際においても、正確に変化を検知することが可能となる。   Therefore, in the lifting device of this embodiment, when the tension increases by providing the spring member 35a having a large spring constant suitable for overload detection and the spring member 35b having a small spring constant suitable for slack detection. In addition, even when the tension decreases, it becomes possible to accurately detect a change.

しかもバネ定数の大きいバネ部材35aと、バネ定数の小さいバネ部材35bと、が並列に配置されているため、複数のバネ部材35a、35bが直列に配置される構造に比べて、バネ部材の長手方向に大型化することを避け、装置を小型化できる。   Moreover, since the spring member 35a having a large spring constant and the spring member 35b having a small spring constant are arranged in parallel, the length of the spring member is longer than the structure in which the plurality of spring members 35a and 35b are arranged in series. The size of the apparatus can be reduced by avoiding an increase in size in the direction.

(2)また本実施形態の昇降装置は、過負荷検知手段(39、51、53、55)が、滑車5の下方移動に対応して変位する1以上の検知ドグ51、53、55と、当該検知ドグの変位に応じて押釦され巻取ドラム2の回転を停止させるリミットスイッチ39と、を備えて構成されている。そのため、検知ドグ51、53、55を介してリミットスイッチ39を押釦する構造であるため、リミットスイッチ39の配置レイアウトの自由度が高まる。   (2) Further, the lifting device of the present embodiment includes one or more detection dogs 51, 53, 55 in which the overload detection means (39, 51, 53, 55) is displaced corresponding to the downward movement of the pulley 5. The limit switch 39 is configured to be pressed according to the displacement of the detection dog and stop the rotation of the winding drum 2. Therefore, since the limit switch 39 is pushed through the detection dogs 51, 53, and 55, the degree of freedom in the layout of the limit switch 39 is increased.

(3)また本実施形態の昇降装置は、たるみ検知手段(37、63)は、滑車5の上方移動に対応して変位する1以上の検知ドグ63と、当該検知ドグの変位に応じて押釦され巻取ドラム2の回転を停止させるリミットスイッチ39と、を備えて構成されている。そのため、検知ドグ63を介してリミットスイッチ39を押釦する構造であるため、リミットスイッチ39の配置レイアウトの自由度が高まる。   (3) Further, in the lifting device of this embodiment, the sag detection means (37, 63) includes one or more detection dogs 63 that are displaced corresponding to the upward movement of the pulley 5, and a push button according to the displacement of the detection dogs. And a limit switch 39 for stopping the rotation of the winding drum 2. Therefore, since the limit switch 39 is pushed through the detection dog 63, the degree of freedom in the layout of the limit switch 39 is increased.

以上のように本発明によれば、バネ定数の大きいバネと、バネ定数の小さいバネと、が並列に配置されているため、複数のバネが直列に配置される構造に比べて装置を小型化できる。   As described above, according to the present invention, since the spring having a large spring constant and the spring having a small spring constant are arranged in parallel, the apparatus is downsized compared to a structure in which a plurality of springs are arranged in series. it can.

(変形例)
上述の実施形態では、吊材3の一端を固定体1に固定し、吊材3の他端を1つの巻取ドラム2で巻き取る構造であったが、本発明ではこれに限定されず、例えば図14に示す変形例のように巻取ドラム2、2を2つ設けて吊材3の両端をそれぞれ巻取ドラム2、2で巻き取る構造であってもよいし、また例えば図15に示す変形例のように吊材3の一端を昇降体6に固定して吊材3の他端を巻取ドラム2で巻き取る構造であってもよく、またその他の構造であっても本発明を適用できる。
(Modification)
In the above-described embodiment, one end of the suspension member 3 is fixed to the fixed body 1, and the other end of the suspension member 3 is wound up by one winding drum 2. However, the present invention is not limited to this, For example, as shown in the modification shown in FIG. 14, two winding drums 2 and 2 may be provided and both ends of the suspension member 3 may be wound around the winding drums 2 and 2, respectively. As shown in the modification, one end of the suspension member 3 may be fixed to the elevating body 6 and the other end of the suspension member 3 may be wound around the take-up drum 2. Can be applied.

また、上記実施形態に基づいて当業者等によりなされる他の実施形態、実施例及び運用技術等は全て本発明の範疇に含まれることは勿論である。   In addition, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are all included in the scope of the present invention.

本発明の一実施形態の昇降装置の概念図。The conceptual diagram of the raising / lowering apparatus of one Embodiment of this invention. 同昇降装置の上方からの斜視図。The perspective view from the upper part of the raising / lowering apparatus. 図2中のIII−III線に沿う断面図。Sectional drawing which follows the III-III line | wire in FIG. 同昇降装置の自動停止機構の上方からみた斜視図。The perspective view seen from the upper direction of the automatic stop mechanism of the raising / lowering apparatus. 同自動停止機構の下方からみた斜視図。The perspective view seen from the downward direction of the automatic stop mechanism. 同自動停止機構の正面図。The front view of the automatic stop mechanism. 同自動停止機構の左側面図。The left view of the automatic stop mechanism. 同自動停止機構の下面図。The bottom view of the automatic stop mechanism. 図6の自動停止機構の正面図においてベース本体からブラケットおよび検知ドグを取り外した図。The figure which removed the bracket and the detection dog from the base main body in the front view of the automatic stop mechanism of FIG. 同自動停止機構によるたるみ検知を説明するために図6の正面図において要部のみを図示した要部拡大図であって、(a)はたるみを検知する前の通常状態であり、(b)はたるみを検知した状態を示す図。In order to explain the sag detection by the automatic stop mechanism, FIG. 6 is a main part enlarged view showing only the main part in the front view of FIG. 6, (a) is a normal state before detecting the sag, (b) The figure which shows the state which detected the slack. (a)はたるみを検知する前の通常状態であり、(b)はたるみを検知した状態を示す図7相当の図。(A) is a normal state before detecting a slack, (b) is a figure equivalent to FIG. 7 which shows the state which detected the slack. 同自動停止機構による過負荷検知を説明するために図6の正面図において要部のみを図示した要部拡大図であって、(a)は検知前の通常状態を示し、(b)は過負荷を検知した状態を示す図。In order to explain the overload detection by the automatic stop mechanism, FIG. 6 is a main part enlarged view showing only the main part in the front view of FIG. 6, wherein (a) shows a normal state before detection, and (b) The figure which shows the state which detected load. (a)は過負荷を検知する前の通常状態であり、(b)は過負荷を検知した状態を示す図8相当の図。FIG. 9A is a normal state before an overload is detected, and FIG. 9B is a diagram corresponding to FIG. 8 illustrating a state where an overload is detected. 昇降装置の第1変形例を示す図1相当の図。The figure equivalent to FIG. 1 which shows the 1st modification of an raising / lowering apparatus. 昇降装置の第2変形例を示す図1相当の図。The figure equivalent to FIG. 1 which shows the 2nd modification of an raising / lowering apparatus.

符号の説明Explanation of symbols

1…固定体
2…巻取ドラム
3…吊材
4…滑車
5…滑車
6…昇降体
7…滑車
9…固定部
11…収容凹部
21…電動モータ
23…減速ユニット
30…自動停止機構
31…ベース
31a…ベース本体
31b…ブラケット
31c…ブラケット
32…棚部
33…滑車軸
33a…一端
33b…他端
34a、35…バネ収容部
35a…第1バネ部材
35b…第2バネ部材
37…リミットスイッチ
37b…プランジャ
37c…ヒンジレバー
37d…回転自由端
39…リミットスイッチ
39b…プランジャ
39c…ヒンジレバー
39d…回転自由端
41…固定板部
43…取付板部
45…スライドガイド部
51、53、55、39…過負荷検知手段
51…第1の検知板(検知ドグ)
51a…板状本体部
51b…バネ座金部
51c…中央開口
51d…押圧片
53…第2の検知板
53a…押圧片
53c…受圧片
54…回転軸
55…第3の検知板
55a…本体部
55b…カム部
55c…受圧片
63、37…たるみ検知手段
63…検知板(検知ドグ)
63a…回転端
64…回転軸
DESCRIPTION OF SYMBOLS 1 ... Fixed body 2 ... Winding drum 3 ... Hanging material 4 ... Pulley 5 ... Pulley 6 ... Elevating body 7 ... Pulley 9 ... Fixed part 11 ... Housing recessed part 21 ... Electric motor 23 ... Deceleration unit 30 ... Automatic stop mechanism 31 ... Base 31a ... Base body 31b ... Bracket 31c ... Bracket 32 ... Shelf 33 ... Pulley shaft 33a ... One end 33b ... Other end 34a, 35 ... Spring accommodating part 35a ... First spring member 35b ... Second spring member 37 ... Limit switch 37b ... Plunger 37c ... Hinge lever 37d ... Free rotation end 39 ... Limit switch 39b ... Plunger 39c ... Hinge lever 39d ... Free rotation end 41 ... Fixed plate portion 43 ... Mounting plate portion 45 ... Slide guide portion 51, 53, 55, 39 ... Overload Load detection means 51... First detection plate (detection dog)
51a ... Plate-shaped main body 51b ... Spring washer 51c ... Central opening 51d ... Pressing piece 53 ... Second detecting plate 53a ... Pressing piece 53c ... Pressure receiving piece 54 ... Rotating shaft 55 ... Third detecting plate 55a ... Main body 55b ... Cam part 55c ... Pressure receiving piece 63, 37 ... Sag detection means 63 ... Detection plate (detection dog)
63a ... rotating end 64 ... rotating shaft

Claims (3)

天井に回転自在に支持される巻取ドラムと、前記巻取ドラムから繰り出される吊材が上掛けされて当該吊材を下方向に向きを変えて垂下させる滑車と、前記吊材に吊下支持される昇降体と、を備え、前記巻取ドラムによる吊材の巻取回転/巻出回転によって前記昇降体を上下昇降させる昇降装置であって、
前記滑車を下側から支持するバネ部材と、
前記吊材の張力増大により前記バネ部材が圧縮変形して前記滑車が下方に移動したことを検知すると、前記巻取ドラムの回転を停止させる過負荷検知手段と、
前記吊材の張力減少により前記バネ部材が伸張変形して前記滑車が上方に移動したことを検知すると、前記巻取ドラムの回転を停止させるたるみ検知手段と、
を備え、
前記バネ部材は、バネ定数の相違する複数のバネ部材が並列に配置されて構成されていることを特徴とする昇降装置。
A winding drum that is rotatably supported on the ceiling, a pulley that is hung from a winding material that is drawn out from the winding drum and that hangs in a downward direction, and a suspension that is supported by the suspension material An elevating device, and elevating and lowering the elevating body up and down by winding / unwinding rotation of the suspension material by the winding drum,
A spring member for supporting the pulley from below;
An overload detecting means for stopping rotation of the winding drum when detecting that the spring member is compressed and deformed due to an increase in tension of the suspension member and the pulley is moved downward;
A slack detecting means for stopping rotation of the take-up drum when detecting that the spring member is extended and deformed due to a decrease in tension of the suspension member and the pulley is moved upward ;
With
The spring member elevating device, wherein a plurality of spring members having different bus Ne constant is formed by arranging in parallel.
請求項1に記載の昇降装置であって、
前記過負荷検知手段は、前記滑車の下方移動に対応して変位する1以上の検知ドグと、当該検知ドグの変位に応じて押釦されるリミットスイッチと、を備えて構成されていることを特徴とする昇降装置。
The lifting device according to claim 1,
The overload detection means includes one or more detection dogs that are displaced corresponding to the downward movement of the pulley, and a limit switch that is pushed according to the displacement of the detection dogs. Lifting device.
請求項1に記載の昇降装置であって、
前記たるみ検知手段は、前記滑車の上方移動に対応して変位する1以上の検知ドグと、当該検知ドグの変位に応じて押釦されるリミットスイッチと、を備えて構成されていることを特徴とする昇降装置。
The lifting device according to claim 1,
The sag detecting means includes one or more detection dogs that are displaced in response to the upward movement of the pulley, and a limit switch that is pushed according to the displacement of the detection dogs. Lifting device to do.
JP2008044965A 2008-02-26 2008-02-26 lift device Expired - Fee Related JP5184143B2 (en)

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CN112303180A (en) * 2020-12-24 2021-02-02 新乡职业技术学院 Damping device of combined type lifting equipment

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CN106276660B (en) * 2016-08-24 2018-10-26 德马科起重机械有限公司 A kind of electric block anticollision limiting device
CN114044458A (en) * 2021-11-16 2022-02-15 希斯芮烟囱科技(连云港)有限公司 Micro-motion fixed pulley brake control equipment with safety limiting protection

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JP4012365B2 (en) * 2000-09-29 2007-11-21 松下電工株式会社 lift device
JP4269717B2 (en) * 2003-02-27 2009-05-27 パナソニック電工株式会社 lift device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112303180A (en) * 2020-12-24 2021-02-02 新乡职业技术学院 Damping device of combined type lifting equipment

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