JPS63714Y2 - - Google Patents

Description

【考案の詳細な説明】 この考案はチエンブロツクの駆動軸抜止装置に
関するものである。[Detailed Description of the Invention] This invention relates to a drive shaft retaining device for a chain block.

チエンブロツクにおける手鎖車・荷鎖車間の回
転伝達機構の一般的な構成は、第１図および第２
図に示すように被駆動部材１を駆動軸２のねじ部
２ａに螺着するとともに、この被駆動部材１のボ
ス１ａ外周部に摩擦板３、爪車４および摩擦板
３′を回転自在に嵌め込む一方、駆動軸２の前記
ねじ部２ａに手鎖車５を螺合して、駆動軸２に対
する手鎖車５の相対回動により、手鎖車５と被駆
動部材１の対向側面間に摩擦板３、爪車４および
摩擦板３′を挾圧して、手鎖車４・被駆動部材１
間に付与される摩擦抵抗により、被駆動部材１、
駆動軸２およびこの駆動軸２の他端側に装置され
る減速ギヤー機構７を介して手鎖車５・荷鎖車６
間の回転伝達をはかるようにしたものである。 The general configuration of the rotation transmission mechanism between the chain wheel and the wagon in the chain block is shown in Figures 1 and 2.
As shown in the figure, the driven member 1 is screwed onto the threaded portion 2a of the drive shaft 2, and a friction plate 3, a ratchet wheel 4, and a friction plate 3' are rotatably attached to the outer periphery of the boss 1a of the driven member 1. At the same time, the hand chain wheel 5 is screwed onto the threaded portion 2a of the drive shaft 2, and due to relative rotation of the hand chain wheel 5 with respect to the drive shaft 2, a friction plate is formed between the opposite side surfaces of the hand chain wheel 5 and the driven member 1. 3. Clamp and press the ratchet wheel 4 and friction plate 3' to release the hand chain wheel 4 and driven member 1.
Due to the frictional resistance applied between the driven members 1,
The hand chain wheel 5 and the wagon 6 are connected to each other via the drive shaft 2 and the reduction gear mechanism 7 installed on the other end of the drive shaft 2.
It is designed to measure the rotational transmission between the two.

上記構成において、駆動軸２に対し荷鎖車６の
回転軸６ａを回転自在に外嵌することにより、回
転軸６ａで駆動軸２を支承し、駆動軸２の非手鎖
車側軸端に固設した駆動軸側歯車８、この歯車８
に噛合する一対の遊び歯車９，９′、前記荷鎖車
回転軸６ａの軸端に固設され前記遊び歯車９，
９′に噛合する荷鎖車側歯車１０で減速ギヤー機
構７を形成しているが、前記駆動軸側歯車８の外
径が駆動軸２の軸径より小さいときには手鎖車側
に抜け出す危険があるため、これを防止するのに
従来のチエンブロツクでは、第１図に示すように
荷鎖車回転軸６ａの内周面に円周溝を形成してこ
の円周溝にスナツプリング１１を嵌着する一方、
例えば駆動軸２のねじ部２ａの軸径を荷鎖車回転
軸６ａに支承される軸部より少し小さくして、ね
じ部２ａとの軸径段差によつて形成される肩部を
前記スナツプリング１１で受け止めることにより
駆動軸２の抜け止めをはかるようにしていた。 In the above configuration, by rotatably fitting the rotating shaft 6a of the chain wheel 6 onto the drive shaft 2, the rotating shaft 6a supports the drive shaft 2, and is fixed to the shaft end of the drive shaft 2 on the non-chain wheel side. The installed drive shaft side gear 8, this gear 8
a pair of idler gears 9, 9' that mesh with the idler gears 9, 9', which are fixed to the shaft end of the wheel rotation shaft 6a;
The chain wheel side gear 10 meshing with the wheel chain wheel 9' forms a reduction gear mechanism 7, but if the outer diameter of the drive shaft side gear 8 is smaller than the shaft diameter of the drive shaft 2, there is a risk of it slipping out to the hand chain wheel side. Therefore, in order to prevent this, in the conventional chain block, a circumferential groove is formed on the inner circumferential surface of the wagon rotating shaft 6a, and the snap ring 11 is fitted into this circumferential groove, as shown in FIG. on the other hand,
For example, the shaft diameter of the threaded portion 2a of the drive shaft 2 may be made slightly smaller than that of the shaft portion supported by the wagon rotating shaft 6a, and the shoulder portion formed by the shaft diameter step with the threaded portion 2a may be formed by the snap ring 11. The drive shaft 2 is prevented from coming off by being caught by the handle.

しかしながら、このような駆動軸抜止構造で
は、荷鎖車回転軸６ａの内周面への円周溝の加工
が面倒であるばかりでなく、スナツプリング１１
で受け止められる肩部を形成するために駆動軸２
にも軸径段差を付与する必要があり、全体の加工
作業が煩雑になり、荷鎖車回転軸６ａの内周面の
円周溝へのスナツプリング１１の嵌着も組立作業
を面倒にするなど、生産性の観点から問題があつ
た。 However, with such a drive shaft retaining structure, not only is it troublesome to process the circumferential groove on the inner circumferential surface of the wagon rotating shaft 6a, but also the snap spring 11
Drive shaft 2 to form a shoulder that can be received by
It is necessary to provide a step in the shaft diameter, which complicates the overall machining work, and fitting the snap spring 11 into the circumferential groove on the inner circumferential surface of the wagon rotating shaft 6a also complicates the assembly work. , there was a problem from a productivity perspective.

この考案は、従来例における如上の欠点を解消
し、加工・組立の容易なチエンブロツクの駆動軸
抜止装置を提供することを目的とするものであ
る。 The object of this invention is to eliminate the above-mentioned drawbacks of the conventional example and to provide a chain block drive shaft retaining device that is easy to process and assemble.

この考案の一実施例を第３図および第４図に基
づいて説明すれば、駆動軸１２に対し回転自在に
外嵌した荷鎖車１６の回転軸１６ａを、チエンブ
ロツク本体を形成する一対の側板１３，１３間に
支承することにより、駆動軸１２を荷鎖車回転軸
１６ａでこれと同心状に軸支し、駆動軸１２の一
方の軸端に固設した歯車１８と、この歯車１８に
噛合する一対の遊び歯車１９，１９と、前記荷鎖
車回転軸１６ａの軸端に固設され前記遊び歯車１
９，１９に噛合する歯車１４とからなる減速ギヤ
ー機構１７により、駆動軸１２・荷鎖車１６間の
回転伝達をはかるようにしたチエンブロツクにお
いて、前記駆動軸１２の歯車非固設部外周面に円
周溝１２ａを形成し、この円周溝１２ａに第４図
に示す２つ割りのリング片２０ａ，２０ａからな
る抜止リング２０を嵌合させるとともに、荷鎖車
回転軸１６ａに固設される歯車１４の一方の端面
側を回転軸１６ａの軸端よりわずかに突出させ、
この歯車１４の突出部内周面で前記抜止リング２
０の外周部を囲むことにより抜止リング２０を抱
持し、この抜止リング２０を荷鎖車回転軸１６ａ
の軸端面で受け止めて駆動軸１２の手鎖車装備側
への抜け止めをはかるようにしたものである。 An embodiment of this invention will be described with reference to FIGS. 3 and 4. The rotating shaft 16a of the wagon 16, which is rotatably fitted onto the drive shaft 12, is connected to a pair of shafts forming a chain block body. By being supported between the side plates 13, 13, the drive shaft 12 is supported concentrically with the wagon rotation shaft 16a, and a gear 18 is fixed to one shaft end of the drive shaft 12. a pair of idler gears 19, 19 meshing with the idler gear 1, which is fixed to the shaft end of the wheel rotation shaft 16a;
In a chain block configured to transmit rotation between a drive shaft 12 and a wheeled wheel 16 by a reduction gear mechanism 17 consisting of a gear 14 meshing with gears 9 and 19, the outer circumferential surface of the gear non-fixed portion of the drive shaft 12 A circumferential groove 12a is formed in the circumferential groove 12a, and a retaining ring 20 consisting of two ring pieces 20a, 20a shown in FIG. 4 is fitted into this circumferential groove 12a. One end surface side of the gear 14 is slightly protruded from the shaft end of the rotating shaft 16a,
The retaining ring 2
The retaining ring 20 is held by surrounding the outer periphery of the wheel, and the retaining ring 20 is attached to the wagon rotation shaft 16a.
The shaft end face of the drive shaft 12 is received to prevent the drive shaft 12 from slipping off toward the hand chain wheel equipment side.

側板１３には減速ギヤー機構１７を覆う保持枠
２１が取り付けられ、この保持枠２１と側板１３
との間に前記一対の遊び歯車１９，１９の支軸２
２，２２をそれぞれ軸架している。前記一対の遊
び歯車１９，１９は、それぞれ駆動軸１２側の歯
車１８に噛合する大歯車１９ａ，１９ａと荷鎖車
１６側の歯車１４に噛合する小歯車１９ｂ，１９
ｂとからなる２段歯車形状とし、遊び歯車１９，
１９を介して歯車１８の回転を歯車１４へ減速し
て伝えるようにしている。 A holding frame 21 that covers the reduction gear mechanism 17 is attached to the side plate 13, and this holding frame 21 and the side plate 13
The support shaft 2 of the pair of idle gears 19, 19 is located between
2 and 22 are each mounted on a shaft. The pair of idle gears 19, 19 are large gears 19a, 19a that mesh with the gear 18 on the drive shaft 12 side, and small gears 19b, 19 that mesh with the gear 14 on the chain wheel 16 side, respectively.
It has a two-stage gear shape consisting of b, and idler gears 19,
The rotation of the gear 18 is transmitted to the gear 14 via the gear 19 at a reduced speed.

手鎖車側の構成については、先の従来例と同様
である。 The configuration on the hand chain wheel side is the same as the previous conventional example.

抜止リング２０はその板厚を大きくするほど、
また円周溝１２ａはその深さ寸法を大きくするほ
ど、抜止リング２０の保持を確実にすることがで
きるが、この実施例のように遊び歯車１９の大歯
車１９ａ端面で抜止リング２０を押えれば、抜止
リング２０の保持を一層確実にすることができ
る。 As the thickness of the retaining ring 20 increases,
Further, the larger the depth of the circumferential groove 12a, the more securely the retaining ring 20 can be held. For example, the retaining ring 20 can be held even more reliably.

この考案の他の実施例を第５図に示す。この駆
動軸抜止装置は、歯車１４の内周面で抜止リング
２０を囲むことにより、円周溝１２ａからの抜止
リング２０の脱落を防止する前記実施例の構成に
替えて、荷鎖車回転軸１６′ａの端面に凹陥面部
２３を形成し、駆動軸１２の円周溝１２ａに嵌合
させた２つ割りの抜止リング２０を前記凹陥面部
２３に嵌入することにより、凹陥面部２３の周壁
面で抜止リング２０の外周部を囲んで抜止リング
２０を抱持するようにしたものであり、そのほか
の構成は前記実施例と同様である。 Another embodiment of this invention is shown in FIG. This drive shaft slip-off prevention device replaces the structure of the above-mentioned embodiment in which the slip-off prevention ring 20 is surrounded by the inner peripheral surface of the gear 14 to prevent the slip-off prevention ring 20 from falling off from the circumferential groove 12a. A concave surface portion 23 is formed on the end surface of the drive shaft 16'a, and the two-part retaining ring 20, which is fitted into the circumferential groove 12a of the drive shaft 12, is fitted into the concave surface portion 23. The outer peripheral portion of the retaining ring 20 is surrounded by the retaining ring 20 to hold the retaining ring 20, and the other structure is the same as that of the previous embodiment.

この実施例では、駆動軸１２への円周溝１２ａ
の加工に加えて、荷鎖車回転軸１６′ａの端面に
凹陥面部２３の加工を必要とするので、加工の点
では先の実施例に比べてやや加工工数が増加する
が、一方で歯車１４を荷鎖車回転軸１６′ａの端
面より突出させるなどの構成を必要としないなど
の利点を有する。 In this embodiment, the circumferential groove 12a on the drive shaft 12 is
In addition to machining, it is necessary to machining the concave surface portion 23 on the end face of the wheel rotating shaft 16'a, so the number of machining steps is slightly increased compared to the previous embodiment. 14 is not required to protrude from the end face of the wagon rotating shaft 16'a.

なお、前記各実施例では、抜止リング２０とし
て２つ割りリングを用いているが、このほか第６
図に示すようなスナツプリング２４を用いてもよ
く、その場合には抜止リングの装着に補助器具を
要するなど多少組立が面倒になるが、一方で歯車
１４や凹陥面部２３で抜止リングを抱持するなど
の構成を省略することができる。 In addition, in each of the above embodiments, a split ring is used as the retaining ring 20, but in addition to this, a sixth ring is used.
A snap spring 24 as shown in the figure may be used, but in that case, the assembly will be somewhat troublesome as an auxiliary tool is required to attach the retaining ring, but on the other hand, the retaining ring can be held by the gear 14 or the concave surface portion 23. Configurations such as the following can be omitted.

さらに、前記実施例のように抜止リング２０と
して２つ割りリングを用い、これを駆動軸１２の
円周溝１２ａに嵌合させたあと、スポツト溶接し
て駆動軸１２への固着をはかることにより、歯車
１４や凹陥面部２３による脱落防止構造を省略し
てもよい。この場合には、スポツト溶接を必要と
する点で先の各実施例に比べ多少作業性は劣る
が、スポツト溶接そのものは簡単な作業であり、
荷鎖車回転軸の内周面に円周溝を形成し、この円
周溝にスナツプリングを嵌着するといつた従来の
加工・組立手順に比べれば、生産性は一層向上す
る。 Furthermore, as in the embodiment described above, a split ring is used as the retaining ring 20, and after this is fitted into the circumferential groove 12a of the drive shaft 12, it is fixed to the drive shaft 12 by spot welding. , the drop-off prevention structure including the gear 14 and the concave surface portion 23 may be omitted. In this case, the workability is somewhat inferior to the previous embodiments in that spot welding is required, but the spot welding itself is a simple operation.
Productivity is further improved compared to conventional processing and assembly procedures in which a circumferential groove is formed on the inner circumferential surface of the wagon rotating shaft and a snap spring is fitted into this circumferential groove.

この考案の駆動軸抜止装置によれば、駆動軸１
２の外周部に円周溝１２ａを形成し、この円周溝
１２ａに荷鎖車１６，１６′の回転軸１６ａ，１
６′ａの減速ギヤー機構１７装備側に向く軸端面
で受け止められる抜止リング２０を嵌装したた
め、荷鎖車回転軸１６ａ，１６′ａに内周溝を形
成するといつた面倒な加工が不要で、抜止リング
２０の装着作業も容易になり、チエンブロツクの
生産性向上をはかることができる。 According to the drive shaft removal prevention device of this invention, the drive shaft 1
A circumferential groove 12a is formed on the outer periphery of the wheel 2, and the rotation shafts 16a, 1 of the carts 16, 16' are formed in the circumferential groove 12a.
Since the retaining ring 20 is fitted on the shaft end face facing toward the installation side of the reduction gear mechanism 17 of 6'a, there is no need for troublesome machining such as forming inner circumferential grooves on the wagon rotating shafts 16a, 16'a. The work of installing the retaining ring 20 becomes easier, and the productivity of the chain block can be improved.

とくに実施例のように、抜止リング２０として
２つ割りリングを用い、歯車１４の内周面や凹陥
面部２３の周壁面で抜止リング２０を抱持して円
周溝１２ａからの脱落防止をはかることにより、
抜止リング２０の装着に特殊な補助具を必要とせ
ず組立を一層容易に行うことができる。 In particular, as in the embodiment, a split ring is used as the retaining ring 20, and the retaining ring 20 is held by the inner peripheral surface of the gear 14 or the peripheral wall surface of the recessed surface portion 23 to prevent it from falling off from the circumferential groove 12a. By this,
No special auxiliary tools are required to attach the retaining ring 20, making assembly easier.

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

第１図および第２図はそれぞれ従来例を示す縦
断面図および部分水平断面図、第３図はこの考案
の一実施例を示す水平断面図、第４図はその抜止
リングの平面図、第５図はこの考案の他の実施例
を示す水平断面図、第６図は抜止リングとして適
用されるスナツプリングの平面図である。 １２……駆動軸、１４……荷鎖車側歯車、１
６，１６′……荷鎖車、１６ａ，１６′ａ……回転
軸、１７……減速ギヤー機構、１８……駆動軸側
歯車、１９……遊び歯車、２０……抜止リング、
２３……凹陥面部。 1 and 2 are a vertical sectional view and a partial horizontal sectional view showing a conventional example, respectively, FIG. 3 is a horizontal sectional view showing an embodiment of this invention, and FIG. 4 is a plan view of the retaining ring. FIG. 5 is a horizontal sectional view showing another embodiment of this invention, and FIG. 6 is a plan view of a snap ring used as a retaining ring. 12... Drive shaft, 14... Wagon side gear, 1
6, 16'... Luggage wheel, 16a, 16'a... Rotating shaft, 17... Reduction gear mechanism, 18... Drive shaft side gear, 19... Idle gear, 20... Preventing ring,
23... Concave surface portion.

Claims (1)

【実用新案登録請求の範囲】 (1) 手鎖車の回転を制動機構を介して伝達される
駆動軸と、自己の回転軸を前記駆動軸に対し回
転自在に外嵌した荷鎖車と、前記駆動軸に固設
した駆動軸側歯車、この駆動軸側歯車に噛合す
る遊び歯車、前記荷鎖車の回転軸に固設され前
記遊び歯車に噛合する荷鎖車側歯車からなり駆
動軸・荷鎖車間の回転伝達をはかる減速ギヤー
機構とを備えたチエンブロツクにおいて、前記
駆動軸の外周部に円周溝を形成し、この円周溝
に前記荷鎖車の回転軸の減速ギヤー機構装備側
に向く軸端面で受け止められる抜止リングを嵌
装したチエンブロツクの駆動軸抜止装置。 (2) 前記抜止リングは２つ割りリングからなり、
前記荷鎖車側歯車の荷鎖車回転軸軸端より突出
する部分の内周面で前記抜止リングの外周部を
囲んだ実用新案登録請求の範囲第(1)項記載のチ
エンブロツクの駆動軸抜止装置。 (3) 前記抜止リングは２つ割りリングからなり、
前記荷鎖車の回転軸端面に形成した凹陥面部に
前記抜止リングを嵌入した実用新案登録請求の
範囲第(1)項記載のチエンブロツクの駆動軸抜止
装置。 (4) 前記抜止リングがスナツプリングである実用
新案登録請求の範囲第(1)項記載のチエンブロツ
クの駆動軸抜止装置。[Claims for Utility Model Registration] (1) A drive shaft to which the rotation of the hand chain wheel is transmitted via a braking mechanism, a chain wheel having its own rotating shaft rotatably fitted onto the drive shaft, and The drive shaft/load consists of a drive shaft gear fixed to the drive shaft, an idle gear meshing with the drive shaft gear, and a wagon gear fixed to the rotating shaft of the wagon and meshing with the idle gear. In a chain block equipped with a reduction gear mechanism for transmitting rotation between chain wheels, a circumferential groove is formed on the outer periphery of the drive shaft, and a side of the rotation shaft of the chain wheel equipped with the reduction gear mechanism is formed in the circumferential groove. A chain block drive shaft retaining device fitted with a retaining ring that is caught on the shaft end facing toward. (2) The retaining ring consists of a two-split ring,
The drive shaft of the chain block according to claim 1, wherein the outer circumferential portion of the retaining ring is surrounded by the inner peripheral surface of the portion of the wagon side gear that protrudes from the end of the wagon rotating shaft. Retention device. (3) The retaining ring consists of a two-part ring,
The chain block drive shaft retaining device according to claim 1, wherein the retaining ring is fitted into a concave surface formed on the end face of the rotating shaft of the wagon. (4) The drive shaft retaining device for a chain block according to claim (1), wherein the retaining ring is a snap ring.