JP2006059737A - Limit switch - Google Patents

Limit switch Download PDF

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Publication number
JP2006059737A
JP2006059737A JP2004242084A JP2004242084A JP2006059737A JP 2006059737 A JP2006059737 A JP 2006059737A JP 2004242084 A JP2004242084 A JP 2004242084A JP 2004242084 A JP2004242084 A JP 2004242084A JP 2006059737 A JP2006059737 A JP 2006059737A
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Prior art keywords
roller
limit switch
elastic portion
dog
elastic part
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JP2004242084A
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Japanese (ja)
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Takeshi Okamoto
毅 岡本
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Fuji Electric FA Components and Systems Co Ltd
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Fuji Electric FA Components and Systems Co Ltd
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Priority to JP2004242084A priority Critical patent/JP2006059737A/en
Publication of JP2006059737A publication Critical patent/JP2006059737A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce collision sound when a roller of a limit switch contacts a dog with the limit switch detecting a position of an object to be detected which moves like an elevator car at high speed. <P>SOLUTION: A plurality of holes are provided between an outer circumferential surface and an inner circumferential surface of a ring-shaped elastic part of the roller to form a thin part. The hole part may be formed as holes penetrating a side face of the elastic part. The impact when the dog contacts the roller is absorbed and mitigated by deformation of the thin part. With this configuration, the collision sound can be reduced without reducing the hardness of the elastic part of the roller. Since change of the detection position due to abrasion of the elastic part decreases, the roller can be prevented from falling from a wheel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、エレベータ用のかごのように高速で移動する被検出体の位置検出に用いられるリミットスイッチのローラ部の形状に関するものである。   The present invention relates to the shape of a roller portion of a limit switch used for detecting the position of an object to be detected that moves at a high speed like an elevator car.

従来のリミットスイッチとしては、例えば、特許文献1に記載されたエレベータ用のスローダウンリミットスイッチ31Dや、特許文献2に記載された構造が知られている。この従来のリミットスイッチについて、前記、特許文献2に記載された構造では、被検出体に取り付けられたドグ(図示されていない)が移動して、このドグにリミットスイッチのローラ4aが接触し、操作レバー4が揺動すると、他端駆動軸3が回転してプランジャ5を押し、これに従動してスイッチユニット2が応動動作する構造となっている。
この形状のリミットスイッチは、前記のように、被検出体のドグをローラに接触させる構成のため、エレベータのかごの通過検知のように、被検出体が高速で移動する場合には、ドグとローラの接触時に大きな衝突音が発生する。特に近年のエレベータの高速化に伴い衝突音は一層大きくなる傾向にある。
As a conventional limit switch, for example, an elevator slow-down limit switch 31D described in Patent Document 1 and a structure described in Patent Document 2 are known. Regarding the conventional limit switch, in the structure described in Patent Document 2, a dog (not shown) attached to the detected object moves, and the roller 4a of the limit switch contacts this dog. When the operation lever 4 swings, the other end drive shaft 3 rotates to push the plunger 5, and the switch unit 2 is responsively driven by this.
Since the limit switch of this shape is configured to contact the dog of the detected object with the roller as described above, when the detected object moves at a high speed, such as detection of the passage of an elevator car, A loud collision noise is generated when the roller contacts. In particular, with the recent increase in the speed of elevators, the collision noise tends to become even louder.

この、衝突音を軽減するため、図3,図4に示すように、ローラ2は、弾性材からなるリング状の弾性部2eと、前記弾性部2eの内周面に嵌合する円筒状のホイール2aと、該ホイール2aの内面に嵌め込まれたカラー2bとで構成し、ドグ4がローラ2に高速で接触した際の衝撃を弾性部2eで吸収緩和することによって衝突音の軽減を図っていた。
特開2001− 63931号報(図1) 特開2001−266710号報(図1)
In order to reduce this collision noise, as shown in FIG. 3 and FIG. 4, the roller 2 includes a ring-shaped elastic portion 2e made of an elastic material and a cylindrical shape fitted to the inner peripheral surface of the elastic portion 2e. It is composed of a wheel 2a and a collar 2b fitted on the inner surface of the wheel 2a, and the impact sound when the dog 4 comes into contact with the roller 2 at high speed is absorbed and relaxed by the elastic portion 2e to reduce the impact sound. It was.
Japanese Unexamined Patent Publication No. 2001-63931 (FIG. 1) JP 2001-266710 A (FIG. 1)

図5に示すようにレバー3はリミットスイッチ本体1の上部に収納されているロータリーシャフト(図示せず)の端部に固定されており、レバー3が傾動すると、前記ロータリーシャフトが回転してリミットスイッチ本体1がスイッチング動作を行う。
エレベータのかごの通過検知のように、移動速度の速いドグ4の検知に際しては、ドグ4とローラ2の接触時の衝撃により衝突音が大きくなるため、ローラ2には弾性部2eが設けてある。
衝突音は弾性部2eの硬さにより大きさが左右されるので、従来技術では衝突音を小さくするために、ローラの弾性部2eの材料として柔らかい弾性体を使用していた。
しかし、ドグ4の移動速度の高速化による衝撃の増大に対して、弾性部2eの柔らかさを増すと弾性部2eが摩耗しやすくなり、リミットスイッチの検出位置が変化してしまうという問題と弾性部2eがホイール2aから脱落し易くなるという問題があった。
As shown in FIG. 5, the lever 3 is fixed to the end of a rotary shaft (not shown) housed in the upper part of the limit switch body 1, and when the lever 3 is tilted, the rotary shaft rotates and limits. The switch body 1 performs a switching operation.
When detecting the dog 4 having a high moving speed as in the case of detecting the passing of the elevator car, the impact noise is increased due to the impact when the dog 4 and the roller 2 are in contact with each other. Therefore, the roller 2 is provided with an elastic portion 2e. .
Since the impact sound is affected by the hardness of the elastic portion 2e, in the prior art, a soft elastic body is used as a material for the elastic portion 2e of the roller in order to reduce the impact sound.
However, in response to an increase in impact due to an increase in the moving speed of the dog 4, if the softness of the elastic portion 2e is increased, the elastic portion 2e is likely to be worn, and the detection position of the limit switch changes. There was a problem that the portion 2e was easily detached from the wheel 2a.

本発明は、このような従来の課題に鑑みてなされたもので、ローラ2の弾性部2eの材料の柔らかさを増すことなく、ドグ4とローラ2の接触時の衝撃を吸収緩和して衝突音を小さくすることを目的とする。   The present invention has been made in view of such a conventional problem. The impact at the time of contact between the dog 4 and the roller 2 is absorbed and relaxed without increasing the softness of the material of the elastic portion 2e of the roller 2. The purpose is to reduce the sound.

前記課題を解決するため、請求項1に記載の発明では、ドグ4とローラ2が接触する面すなわちローラ2の弾性部2eの外周面と弾性部2eをその内径で固定しているホイール2aの間に複数個の孔を設けることにする。
かかる構成によりローラ2の弾性部2eに薄肉部が形成され、ドグ4とローラ2の接触時の衝撃は、弾性部2eの薄肉部が変形することにより吸収緩和される。こうしてローラ2の弾性部2eの硬度を下げて柔らかくすることなく、衝突音を軽減できるので、弾性部2eの摩耗による検出位置の変化はなくなり、また弾性部2eとホイール2aの嵌合力の低下もなく、弾性部2eの脱落も防止される。
In order to solve the above-mentioned problem, in the invention described in claim 1, the surface of the wheel 2a in which the dog 4 and the roller 2 are in contact with each other, that is, the outer peripheral surface of the elastic portion 2e of the roller 2 and the elastic portion 2e are fixed at the inner diameter. A plurality of holes are provided between them.
With such a configuration, a thin portion is formed in the elastic portion 2e of the roller 2, and the impact at the time of contact between the dog 4 and the roller 2 is absorbed and relaxed by the deformation of the thin portion of the elastic portion 2e. Thus, the impact sound can be reduced without lowering the hardness of the elastic portion 2e of the roller 2 and softening, so that the detection position does not change due to wear of the elastic portion 2e, and the fitting force between the elastic portion 2e and the wheel 2a is also reduced. In addition, the elastic part 2e is prevented from falling off.

本発明によれば、エレベータように高速で移動する物体の位置をリミットスイッチで検知する構成において、ドグ接触時の衝突音を軽減でき、またローラの摩耗による検出位置の変化が少なく、ローラの弾性部がホイールから脱落するのを低減することが可能なリミットスイッチの達成が可能になる。さらに本発明は、ローラの弾性部に複数個の孔を設け、薄肉部を形成することとしたので、従来のリミットスイッチの構造を変えることなく、ローラに追加の加工を施すだけで、経済的に衝突音の低減したリミットスイッチを提供できる。   According to the present invention, in a configuration in which the position of an object that moves at high speed like an elevator is detected by a limit switch, it is possible to reduce collision noise during dog contact, and there is little change in the detection position due to roller wear, and the elasticity of the roller It is possible to achieve a limit switch that can reduce the falling of the part from the wheel. Furthermore, since the present invention provides a plurality of holes in the elastic part of the roller to form a thin part, it is economical to perform additional processing on the roller without changing the structure of the conventional limit switch. Can provide a limit switch with reduced collision noise.

図1は本発明の一実施例を示すリミットスイッチの正面図で、図2は側面図である。なお図2では、ローラ2の部分のみ断面を示している。図2に示すように、リミットスイッチ本体1の上部に収納されているロータリーシャフト(図示せず)の端部に固定されたレバー3の先端に形成した軸2cの周りに回転自在に設けられたローラ2の弾性部2eに、その側面を貫通する複数個(実施例においては12個)の孔2fを形成している。
ローラ2は弾性部2e、ホイール2a、カラー2bから構成されており、弾性部2eはその内面の円周上に設けた凹部を、ホイール2aの外周面に形成した凸部に挿入して抜け止めを形成して嵌合されている。また、ホイール2aの内周にはカラー2bが嵌め込まれており、ローラ2aが軸2cの外周を摺動回転自由に構成されている。
このように構成されたローラ2は、レバー3の先端に形成した軸2cに挿入した後、止め輪2dによりローラ2が軸2cから抜けるのを防止されている。
FIG. 1 is a front view of a limit switch showing an embodiment of the present invention, and FIG. 2 is a side view. In FIG. 2, only the roller 2 is shown in cross section. As shown in FIG. 2, it is rotatably provided around a shaft 2 c formed at the tip of a lever 3 fixed to the end of a rotary shaft (not shown) housed in the upper part of the limit switch body 1. A plurality (12 in the embodiment) of holes 2f penetrating the side surfaces are formed in the elastic portion 2e of the roller 2.
The roller 2 is composed of an elastic portion 2e, a wheel 2a, and a collar 2b. The elastic portion 2e has a concave portion provided on the circumference of the inner surface thereof inserted into a convex portion formed on the outer peripheral surface of the wheel 2a to prevent the roller 2 from coming off. Are formed and fitted. A collar 2b is fitted on the inner periphery of the wheel 2a, and the roller 2a is configured to freely slide and rotate on the outer periphery of the shaft 2c.
The roller 2 configured in this manner is prevented from coming off the shaft 2c by the retaining ring 2d after being inserted into the shaft 2c formed at the tip of the lever 3.

図5に示すようにドグ4がドグ移動方向5の向きに移動してローラ2に接触すると、リミットスイッチ本体1の上部のロータリーシャフト(図示せず)に固定されたレバー3はレバー回転方向6の向きに倒動し、前記ロータリーシャフトが回転してリミットスイッチ本体1がスイッチング動作する。
ドグ4がローラ2の弾性部2eに接触した瞬時を考察すると、弾性部2eの接触部は衝撃力を受けて変形することにより衝撃力を吸収緩和しようとするが、弾性部2eの材料が硬いと変形量は少なく、強く反撥するため衝突音が大きくなるとともに、衝突を繰り返すにつれ摩耗して検出位置が変化する。
本発明によれば、弾性部2eの外周面と内周面との間に複数個の孔が設けられ、弾性部に薄肉部が形成されているので、衝撃力はこの薄肉部の変形により吸収緩和される。そこで、ドグ移動速度が高速化しても弾性部2eの材料の硬度を下げことなく、摩耗の少ない、衝突音の軽減されたリミットスイッチを構成できる。
As shown in FIG. 5, when the dog 4 moves in the direction of the dog movement direction 5 and contacts the roller 2, the lever 3 fixed to the rotary shaft (not shown) on the upper part of the limit switch body 1 is moved in the lever rotation direction 6. The rotary shaft rotates and the limit switch body 1 performs a switching operation.
Considering the moment when the dog 4 comes into contact with the elastic portion 2e of the roller 2, the contact portion of the elastic portion 2e is subjected to the impact force to be deformed to try to absorb and mitigate the impact force, but the material of the elastic portion 2e is hard. The amount of deformation is small and repels strongly, so the collision sound becomes louder and wears as the collision is repeated, and the detection position changes.
According to the present invention, since the plurality of holes are provided between the outer peripheral surface and the inner peripheral surface of the elastic portion 2e and the thin portion is formed in the elastic portion, the impact force is absorbed by the deformation of the thin portion. Alleviated. Therefore, even if the dog moving speed is increased, a limit switch with less wear and reduced impact sound can be configured without reducing the hardness of the material of the elastic portion 2e.

また、弾性部2eとホイール2aの嵌合力の低下もなく、弾性部2eの脱落も防止される。
なお、孔2fは、実施例では円形としたが、長円などとしてもよい。
Further, there is no decrease in the fitting force between the elastic portion 2e and the wheel 2a, and the elastic portion 2e is prevented from falling off.
The hole 2f is circular in the embodiment, but may be an ellipse.

本発明の一実施例によるリミットスイッチの正面図The front view of the limit switch by one Example of this invention 本発明の一実施例によるリミットスイッチの部分断面を含む側面図The side view including the partial cross section of the limit switch by one Example of this invention 従来のリミットスイッチの正面図Front view of conventional limit switch 従来のリミットスイッチの部分断面を含む側面図Side view including a partial cross section of a conventional limit switch リミットスイッチの動作説明図Explanation of limit switch operation

符号の説明Explanation of symbols

1 リミットスイッチ本体
2 ローラ
2e 弾性部
2f 孔
3 レバー
4 ドグ
1 limit switch body 2 roller 2e elastic part 2f hole 3 lever 4 dog

Claims (2)

リミットスイッチの本体部に設けられた駆動軸を回動することによりスイッチング動作するレバー操作式のリミットスイッチであって、該駆動軸に一端を固定された操作レバーと、該操作レバーの他端に回動自在に軸支されたローラ部を有する、レバー操作式リミットスイッチにおいて、前記ローラ部は弾性材からなるとともに、前記ローラの弾性部の外周面と内周面の間に複数個の孔を穿設したことを特徴とするリミットスイッチ。 A limit switch of a lever operation type that performs a switching operation by rotating a drive shaft provided in a main body of the limit switch, the operation lever having one end fixed to the drive shaft, and the other end of the operation lever In the lever-operated limit switch having a roller portion rotatably supported, the roller portion is made of an elastic material, and a plurality of holes are formed between the outer peripheral surface and the inner peripheral surface of the elastic portion of the roller. Limit switch characterized by drilling. 請求項1に記載のリミットスイッチにおいて、弾性部の外周面と内周面との間に穿設した複数個の孔は、前記弾性部の側面を貫通する孔であることを特徴とするリミットスイッチ。
2. The limit switch according to claim 1, wherein the plurality of holes formed between the outer peripheral surface and the inner peripheral surface of the elastic portion are holes that penetrate the side surface of the elastic portion. .
JP2004242084A 2004-08-23 2004-08-23 Limit switch Pending JP2006059737A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016201934A1 (en) * 2015-06-17 2016-12-22 海安县申菱电器制造有限公司 Elevator limit switch and hoistway switch assembly thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016201934A1 (en) * 2015-06-17 2016-12-22 海安县申菱电器制造有限公司 Elevator limit switch and hoistway switch assembly thereof

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