JPH07144890A - Double acting hydraulic jack with safety nut - Google Patents

Double acting hydraulic jack with safety nut

Info

Publication number
JPH07144890A
JPH07144890A JP31603293A JP31603293A JPH07144890A JP H07144890 A JPH07144890 A JP H07144890A JP 31603293 A JP31603293 A JP 31603293A JP 31603293 A JP31603293 A JP 31603293A JP H07144890 A JPH07144890 A JP H07144890A
Authority
JP
Japan
Prior art keywords
ram
pressure chamber
cylinder
center piston
safety nut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP31603293A
Other languages
Japanese (ja)
Inventor
Hitoshi Yamamoto
山本  仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YAMAMOTO KOUJIYUUKI KK
Original Assignee
YAMAMOTO KOUJIYUUKI KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by YAMAMOTO KOUJIYUUKI KK filed Critical YAMAMOTO KOUJIYUUKI KK
Priority to JP31603293A priority Critical patent/JPH07144890A/en
Publication of JPH07144890A publication Critical patent/JPH07144890A/en
Pending legal-status Critical Current

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  • Actuator (AREA)

Abstract

PURPOSE:To prevent the harmful influence of dust and rainwater or the like due to the opening of double acting hydraulic jack in the atmosphere at a side of a center piston at the time of moving a ram forward and increase the output of a jack. CONSTITUTION:A double acting type hydraulic jack with safety nut is formed of a cylinder 2, a ram 1 to be operated inside of the cylinder 2, a center piston 3 provided at the center of the ram 1 and fixed to the bottom of the cylinder 2, and a safety nut 4 with handle 5 for limiting the return of the loaded ram 1. This jack is also provided with a pressure chamber 8 for going-forward, which is formed by the inner surface of the cylinder 2 and the lower end surface of the ram 1, and a pressure chamber 9 for going-forward, which is formed by the inner surface of the ram 1 and the upper end surface of the center piston 3, and a pressure chamber 10 for going-backward, which is formed by the inner surface of the ram 1 and the side surface of the center piston 3. Operating oil flow passages 11, 12 for supplying and discharging the operating oil to each pressure chamber 8, 9, 10 are provided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】安全ナット付両動型油圧ジャッキ
に関する。
[Industrial application] A double-acting hydraulic jack with a safety nut.

【0002】[0002]

【従来の技術】従来の安全ナット付両動型油圧ジャッキ
は、図3に示すように、廻しハンドル35付安全ナット
34が螺合されたラム31が、シリンダー32の下方外
周面に設けられた前進側継手口36から供給される圧力
作動油により前進する際に、ラム31の中心に設けられ
たセンターピストン33上端部に形成する大気室38に
対してラム31の上部に開放された通気穴39から空気
が吸入される、また、後退側継手口37から流路31a
を経て後退側圧力室41に圧力作動油が供給されること
によりラム31が後退し、大気室38の空気が大気中に
放出されるようになっている。
2. Description of the Related Art In a conventional double-acting hydraulic jack with a safety nut, as shown in FIG. 3, a ram 31 to which a safety nut 34 with a turning handle 35 is screwed is provided on a lower outer peripheral surface of a cylinder 32. A vent hole opened at the upper part of the ram 31 with respect to the atmospheric chamber 38 formed at the upper end of the center piston 33 provided at the center of the ram 31 when moving forward with the pressure hydraulic oil supplied from the forward side joint port 36. Air is sucked in from 39, and the flow path 31a from the receding side joint port 37.
The pressure hydraulic oil is supplied to the retreat side pressure chamber 41 through the ram 31 so that the ram 31 retreats, and the air in the atmosphere chamber 38 is discharged into the atmosphere.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、従来の
両動型油圧ジャッキは、ラム31が前進する際に、大気
室38に空気とともに塵埃や雨水などを吸い込むため
に、大気室38内の摺動面に傷がついたりサビが生じた
りする。これによりOリングが損傷したり、ラム31と
センターピストン33との摺動面がかじったりするとい
う問題があった。
However, in the conventional double-acting hydraulic jack, when the ram 31 moves forward, the air chamber 38 slides in the atmosphere chamber 38 in order to suck dust and rainwater together with air. The surface may be scratched or rusted. As a result, the O-ring is damaged, and the sliding surface between the ram 31 and the center piston 33 is galled.

【0004】また、ラム31を上昇させるための油圧が
作用する面積においても、シンダー32の内径Eを直径
とする円の面積からセンターピストン33の外径Fを直
径とする円の面積を差し引いた面積となり、圧力の作用
面積はセンターピストン33の外径Fを直径とする円の
面積分が無駄になるという問題もあった。
Also, in the area where the hydraulic pressure for raising the ram 31 acts, the area of the circle whose diameter is the inner diameter E of the cinder 32 is the area of the circle whose outer diameter F is the center piston 33. There is also a problem that an area of a circle having an outer diameter F of the center piston 33 as a diameter is wasted as an acting area of pressure.

【0005】よって本発明は係る問題点を解消しうる安
全ナット付両動型油圧ジャッキの提供を目的とする。
Therefore, an object of the present invention is to provide a double-acting hydraulic jack with a safety nut that can solve the above problems.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、本発明はシリンダーと、シリンダー内を作動するラ
ムと、ラムの中心部に設けられるとともにシリンダーの
底部に固定されたセンターピストンと、負荷したラムの
戻りを制限する廻しハンドル付安全ナットとから成り、
シリンダー内面とラムの下端面にて形成する前進側圧力
室内及びラム内面とセンターピストンの上端面にて形成
するの前進側圧力室内ならびにラム内面とセンターピス
トンの側面にて形成する後退側圧力室とを備え、それぞ
れの圧力室に作動油を供給排出する作動油の流路を設け
たことにより成ることを特徴とする。
In order to achieve the above object, the present invention provides a cylinder, a ram that operates in the cylinder, a center piston that is provided at the center of the ram and is fixed to the bottom of the cylinder, and a load. It consists of a safety nut with a turning handle that limits the return of the ram
A forward pressure chamber formed by the inner surface of the cylinder and the lower end of the ram, a forward pressure chamber formed by the inner surface of the ram and the upper end of the center piston, and a backward pressure chamber formed by the inner surface of the ram and the side surface of the center piston. And a flow path for hydraulic oil for supplying and discharging hydraulic oil is provided in each pressure chamber.

【0007】[0007]

【作用】本発明の安全ナット付両動型油圧ジャッキによ
れば、ラム内面とセンターピストンの上端面にて形成す
る前進側圧力室に作動油を供給することにより、従来の
ようにこの圧力室に大気が出入りすることがなくなるた
め塵埃や雨水などによる摺動面の傷やサビの発生がなく
なるとともに、センターピストンの上端面の面積に相当
する分の前進側圧力が増加する。
According to the double-acting hydraulic jack with a safety nut of the present invention, by supplying hydraulic oil to the forward pressure chamber formed by the inner surface of the ram and the upper end surface of the center piston, the pressure chamber can be made different from the conventional pressure chamber. Since the atmosphere does not flow in and out, scratches and rust on the sliding surface due to dust and rainwater are eliminated, and the forward pressure corresponding to the area of the upper end surface of the center piston increases.

【0008】[0008]

【実施例1】図1は本発明の実施例1を示す。ラム1は
シリンダー2の内部にてOリング1aを介して進退動自
在に設けられているとともに、ラム1の円筒部外周に負
荷状態にてラム1の後退を阻止する廻しハンドル5付安
全ナット4を螺合させている。
First Embodiment FIG. 1 shows a first embodiment of the present invention. The ram 1 is provided inside the cylinder 2 so as to be able to move back and forth through an O-ring 1a, and the ram 1 has a safety nut 4 with a turning handle 5 that prevents the ram 1 from retracting under load on the outer circumference of the cylinder. Are screwed together.

【0009】ラム1の中心部にはシリンダー2の底部に
ネジ3cにて固定されたセンターピストン3が、Oリン
グ3a及び3bを介してラム1に対して摺動可能に設け
られているとともに、センターピストン3をシリンダー
2の底部にネジ3cにて固定した近傍には作動油をシー
ルするOリング3d,3eが設けられ、ネジ3cは回り
止め3fにてシリンダー2に対して回転不能に固定され
ている。
At the center of the ram 1, a center piston 3 fixed to the bottom of the cylinder 2 with a screw 3c is provided slidably with respect to the ram 1 via O-rings 3a and 3b. O-rings 3d and 3e for sealing hydraulic oil are provided near the center piston 3 fixed to the bottom of the cylinder 2 with a screw 3c, and the screw 3c is fixed to the cylinder 2 with a rotation stopper 3f so as not to rotate. ing.

【0010】これにより、ラム1の下端面とシリンダー
2の内面とにより前進側圧力室8を、ラム1の内面とセ
ンターピストン3の上端面とにより前進側圧力室9を、
ラム1の内面とセンターピストン3の側面とにより後退
側圧力室10を形成する。
As a result, a forward pressure chamber 8 is formed by the lower end surface of the ram 1 and the inner surface of the cylinder 2, and an forward pressure chamber 9 is formed by the inner surface of the ram 1 and the upper end surface of the center piston 3.
The inner surface of the ram 1 and the side surface of the center piston 3 form a retreat side pressure chamber 10.

【0011】そして、ラム1の前進側圧力室8に対し
て、シリンダー2の下部外周面に設けられた継手口6か
ら作動油が供給され、さらに圧力室9対しては圧力室8
に連結してラム1の円筒部肉厚中に穿設された流路11
を経て作動油が供給され、後退側圧力室10に対しては
継手口7からセンターピストン3の軸中に穿設された流
路12を経て作動油が排出される。
The hydraulic oil is supplied to the forward pressure chamber 8 of the ram 1 from a joint port 6 provided on the lower outer peripheral surface of the cylinder 2, and the pressure chamber 9 is pressed against the pressure chamber 9.
11 connected to the ram 1 and bored in the wall thickness of the cylindrical portion of the ram 1.
The hydraulic oil is supplied via the flow path, and the hydraulic oil is discharged to the retreating pressure chamber 10 from the joint port 7 through the flow path 12 bored in the shaft of the center piston 3.

【0012】以上の構成の安全ナット付両動型油圧ジャ
ッキは、ラム1を前進させるに際して圧力作動油を継手
口6から供給し、ラム1の下端面に圧力を作用させると
ともに、流路11を経て圧力室9に供給された圧力作動
油の圧力がセンターピストン3の上端面に作用する。即
ち、ラム1を前進させるために圧力を作用させる面積は
ラム1の下端面とセンターピストン3の上端面とを合計
したものとなり、その作用面積Sは次の式で表されると
おりである。 S=π/4(E2−F2+H2) 従って、センターピストン3の上端面に作用する圧力の
分が従来の同一のジャッキに比べて出力増加となる。
In the double-acting hydraulic jack with a safety nut having the above-mentioned structure, when the ram 1 is moved forward, pressure hydraulic oil is supplied from the joint port 6 to apply pressure to the lower end surface of the ram 1, The pressure of the hydraulic fluid supplied to the pressure chamber 9 through the above acts on the upper end surface of the center piston 3. That is, the area where the pressure is applied to move the ram 1 forward is the sum of the lower end surface of the ram 1 and the upper end surface of the center piston 3, and the acting area S is as expressed by the following equation. S = π / 4 (E 2 −F 2 + H 2 ). Therefore, the amount of the pressure acting on the upper end surface of the center piston 3 is increased as compared with the conventional same jack.

【0013】また、センターピストン3の上端面に形成
した圧力室9には作動油を供給しているので、従来のよ
うにこの圧力室9に大気が出入りすることがなく、従っ
て大気中の塵埃や雨水などによる摺動面のかじりや錆の
発生の恐れがない。
Further, since the working oil is supplied to the pressure chamber 9 formed on the upper end surface of the center piston 3, the atmosphere does not enter and leave the pressure chamber 9 as in the conventional case, and therefore the dust in the atmosphere is not present. There is no risk of galling or rusting of the sliding surface due to rainwater or rainwater.

【0014】[0014]

【実施例2】図2は本発明の実施例2を示す。本実施例
では前記実施例1の前進側圧力室9に対する作動油の流
路11に替えて、センターピストン3の軸中に穿設した
流路13を設けたことを異にするもので、その他の構成
については前記実施例1と同様であるので同一部分につ
いて同一符号を付してその説明を省略する。
Second Embodiment FIG. 2 shows a second embodiment of the present invention. The present embodiment is different from the first embodiment in that the flow passage 11 for the hydraulic oil to the forward pressure chamber 9 is replaced with a flow passage 13 formed in the shaft of the center piston 3. Since the configuration is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.

【0015】本実施例によれば、安全ナット付両動型油
圧ジャッキとしての作用効果は前記実施例1の場合と同
様であるのでその説明を省略する。
According to this embodiment, the function and effect of the double-acting hydraulic jack with a safety nut is the same as that of the first embodiment, and therefore its explanation is omitted.

【0016】[0016]

【発明の効果】本発明によれば、センターピストンの上
端部に形成する圧力室に作動油を供給することにより、
従来のようにその圧力室に大気を出入りさせることがな
くなる。従って、大気中の塵埃や雨水等による摺動面の
傷や錆の発生がないため、Oリングの損傷や摺動面のか
じりもなくなる。また、センターピストンの上端面に圧
力を作用させることにより、従来の同一能力のジャッキ
に比べて出力を増大させることができる。
According to the present invention, by supplying hydraulic oil to the pressure chamber formed at the upper end of the center piston,
The atmosphere does not enter and leave the pressure chamber as in the past. Therefore, since the sliding surface is not scratched or rusted by dust or rainwater in the atmosphere, the O-ring is not damaged and the sliding surface is not galled. Further, by applying pressure to the upper end surface of the center piston, the output can be increased as compared with the conventional jack of the same capacity.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例1を示す安全ナット付両動型油
圧ジャッキの断面図。
FIG. 1 is a sectional view of a double-acting hydraulic jack with a safety nut according to a first embodiment of the present invention.

【図2】本発明の実施例2を示す安全ナット付両動型油
圧ジャッキの断面図。
FIG. 2 is a sectional view of a double-acting hydraulic jack with a safety nut according to a second embodiment of the present invention.

【図3】従来の安全ナット付両動型油圧ジャッキの断面
図。
FIG. 3 is a sectional view of a conventional double-acting hydraulic jack with a safety nut.

【図4】[Figure 4]

【符号の説明】[Explanation of symbols]

1 ラム 2 シリンダー 3 センターピストン 4 安全ナット 5 廻しハンドル 6,7 継手口 8,9 前進側圧力室 10 後退側圧力室 11,12,13 流路 1 ram 2 cylinder 3 center piston 4 safety nut 5 turning handle 6,7 joint port 8,9 forward pressure chamber 10 backward pressure chamber 11,12,13 flow path

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成6年5月26日[Submission date] May 26, 1994

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】図4[Name of item to be corrected] Fig. 4

【補正方法】削除[Correction method] Delete

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 シリンダーと、シリンダー内を作動する
ラムと、ラムの中心部に設けられるとともにシリンダー
の底部に固定されたセンターピストンと、負荷したラム
の戻りを制限する廻しハンドル付安全ナットとから成
り、シリンダー内面とラムの下端面にて形成する前進側
圧力室内及びラム内面とセンターピストンの上端面にて
形成するの前進側圧力室内ならびにラム内面とセンター
ピストンの側面にて形成する後退側圧力室とを備え、そ
れぞれの圧力室に作動油を供給排出する作動油の流路を
設けたことにより成ることを特徴とする安全ナット付両
動型油圧ジャッキ。
1. A cylinder, a ram that operates inside the cylinder, a center piston that is provided at the center of the ram and is fixed to the bottom of the cylinder, and a safety nut with a turning handle that limits the return of the loaded ram. The forward pressure chamber formed by the inner surface of the cylinder and the lower end of the ram, the forward pressure chamber formed by the inner surface of the ram and the upper end of the center piston, and the backward pressure formed by the inner surface of the ram and the side surface of the center piston. A double-acting hydraulic jack with a safety nut, characterized in that a hydraulic oil flow path for supplying and discharging hydraulic oil is provided in each pressure chamber.
JP31603293A 1993-11-22 1993-11-22 Double acting hydraulic jack with safety nut Pending JPH07144890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31603293A JPH07144890A (en) 1993-11-22 1993-11-22 Double acting hydraulic jack with safety nut

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31603293A JPH07144890A (en) 1993-11-22 1993-11-22 Double acting hydraulic jack with safety nut

Publications (1)

Publication Number Publication Date
JPH07144890A true JPH07144890A (en) 1995-06-06

Family

ID=18072500

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31603293A Pending JPH07144890A (en) 1993-11-22 1993-11-22 Double acting hydraulic jack with safety nut

Country Status (1)

Country Link
JP (1) JPH07144890A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103318799A (en) * 2012-03-23 2013-09-25 程曼华 Short mechanical interlocking type hydraulic jack
CN104099869A (en) * 2013-04-15 2014-10-15 财团法人中华顾问工程司 Thin jack device for jacking bridge
RU2562677C1 (en) * 2014-05-19 2015-09-10 Общество с ограниченной ответственностью "Техпром-Инжиниринг" Hydraulic jack with screw support function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103318799A (en) * 2012-03-23 2013-09-25 程曼华 Short mechanical interlocking type hydraulic jack
CN104099869A (en) * 2013-04-15 2014-10-15 财团法人中华顾问工程司 Thin jack device for jacking bridge
RU2562677C1 (en) * 2014-05-19 2015-09-10 Общество с ограниченной ответственностью "Техпром-Инжиниринг" Hydraulic jack with screw support function

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