JPH09280289A - Cylinder cushion - Google Patents

Cylinder cushion

Info

Publication number
JPH09280289A
JPH09280289A JP12088396A JP12088396A JPH09280289A JP H09280289 A JPH09280289 A JP H09280289A JP 12088396 A JP12088396 A JP 12088396A JP 12088396 A JP12088396 A JP 12088396A JP H09280289 A JPH09280289 A JP H09280289A
Authority
JP
Japan
Prior art keywords
annular member
piston
cylinder
flow passage
free flow
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
JP12088396A
Other languages
Japanese (ja)
Inventor
Yukihiro Takada
行博 高田
Mineo Tanahashi
峰夫 棚橋
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.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
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 Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP12088396A priority Critical patent/JPH09280289A/en
Publication of JPH09280289A publication Critical patent/JPH09280289A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To simplify structure and to reduce the number of part items by a method wherein a flow passage for a free flow and a throttle passage consist of a cylinder hole formed in a piston, an annular member, and a cylinder part formed integrally with a cylinder bottom. SOLUTION: When pressure oil is fed through a port A, an oil pressure is exerted on an annular member 11 through a cylinder part D. The annular member 11 is separated away from a sheet surface (f) formed on a stepped part 13 to open a flow passage (g) for a free flow. Pressure oil is fed to a pressure chamber B through a slit H by means of the flow passage (g) for a free flow, and the piston 15 is raised together with an annular member 11. When, in this state, pressure oil is discharged through the port A, the piston 15 is lowered and approaches a most lowering position and when the annular member 11 is fitted in the cylinder part D, a pressure in a pressure chamber B is raised. The annular member 11 is then brought into contact with a sheet surface (f) to close the flow passage (g) for a free flow. In this state, pressure oil in the pressure chamber B flows out through a slight gap (e) between the outer periphery of the cylinder part D and the inner periphery of the annular member 11. The gap (e) forms a throttle and provides a cushion function.

Description

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

【0001】[0001]

【発明の属する技術分野】この発明は、フォークリフト
等に用いる油圧シリンダの、シリンダクッションに関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder cushion of a hydraulic cylinder used for a forklift or the like.

【0002】[0002]

【従来の技術】ポートを形成したボトムと、一端をこの
ボトムで塞いだシリンダチューブと、シリンダチューブ
内を上下に移動するピストンとからなるシリンダは、ポ
ートからシリンダに圧油を供給するとピストンが上昇し
てシリンダが伸長し、逆にポートから圧油が排出される
とピストンが下降してシリンダが収縮する。シリンダの
縮行程時に、ピストンが自重によって勢いよく下降し
て、ボトムのシート面に衝突することを防止し、緩やか
に下降するように、クッション機構が設けられている。
図6に示す従来のシリンダクッションは、シリンダチュ
ーブ16と、ピストン15と、ボトム14とからなるシ
リンダを前提とし、ボトム14には、給排ポートAが形
成されている。ピストン15には、ボトム14側を開口
した筒孔Cを形成し、筒孔Cの内周下方にはベアリング
5をピン6によって止めている。ベアリング5の外周部
には、軸方向にスリットJが形成されている。また、ベ
アリング5をピン6で止めるためのピン孔Kの大きさ
は、ピン6の外径より大きく、ベアリング5は多少軸方
向に移動できるようになっている。また、ピストン15
の下端には、筒孔Cと圧力室とを連通するスリットHが
形成されている。
2. Description of the Related Art A cylinder having a bottom formed with a port, a cylinder tube having one end closed by this bottom, and a piston moving up and down in the cylinder tube is moved upward when the pressure oil is supplied from the port to the cylinder. Then, the cylinder extends, and conversely, when pressure oil is discharged from the port, the piston descends and the cylinder contracts. A cushion mechanism is provided so as to prevent the piston from vigorously descending due to its own weight and collide with the bottom seat surface during the compression stroke of the cylinder, and to descend gently.
The conventional cylinder cushion shown in FIG. 6 is premised on a cylinder composed of a cylinder tube 16, a piston 15 and a bottom 14, and the bottom 14 has a supply / discharge port A formed therein. The piston 15 is formed with a cylinder hole C that is open on the bottom 14 side, and the bearing 5 is fixed to the lower portion of the inner periphery of the cylinder hole C by a pin 6. A slit J is formed in the outer peripheral portion of the bearing 5 in the axial direction. Further, the size of the pin hole K for stopping the bearing 5 with the pin 6 is larger than the outer diameter of the pin 6, so that the bearing 5 can be moved to some extent in the axial direction. Also, the piston 15
A slit H that connects the cylindrical hole C and the pressure chamber is formed at the lower end of the.

【0003】上記ベアリング5の内周を摺動可能な筒状
のクッションスプール1を設け、このクッションスプー
ル1の側面には、オリフィスb1〜b4が形成されてい
る。クッションスプール1の下端の外径は、ベアリング
5の内径よりも大きく、その下端をベアリング5より突
出させている。また、クッションスプール1の上端に
は、スプリングガイド2を設け、スプリングガイド2と
ピストン15との間には、スプリングガイド4を介して
スプリング3を装着する。スプリングガイド2の外径
は、筒孔Cの内径より小さく、ベアリング5の外径より
も大きい。なお、符号7は、ピン6が脱落しないように
する、スナップリングである。図示のピストン最下降状
態では、ボトム14の上面にピストン15とクッション
スプール1の底面とが当接し、ポートAは、クッション
スプール1の内部を介して、筒孔Cと連通している。
A cylindrical cushion spool 1 which can slide on the inner circumference of the bearing 5 is provided, and orifices b 1 to b 4 are formed on the side surface of the cushion spool 1. The outer diameter of the lower end of the cushion spool 1 is larger than the inner diameter of the bearing 5, and the lower end of the cushion spool 1 projects from the bearing 5. A spring guide 2 is provided at the upper end of the cushion spool 1, and a spring 3 is mounted between the spring guide 2 and the piston 15 via a spring guide 4. The outer diameter of the spring guide 2 is smaller than the inner diameter of the cylindrical hole C and larger than the outer diameter of the bearing 5. Reference numeral 7 is a snap ring that prevents the pin 6 from falling off. In the lowest piston state shown in the drawing, the piston 15 and the bottom surface of the cushion spool 1 contact the top surface of the bottom 14, and the port A communicates with the cylindrical hole C via the inside of the cushion spool 1.

【0004】ポートAから圧油が供給されると、ベアリ
ング5はボトム14側に少し移動し、圧油は、筒孔Cか
らベアリング5のスリットJと、ピストン15の下端ス
リットH内を経由してピストン15の外側の圧力室Bに
供給される。これにより、ピストン15は上昇する。ピ
ストン15がシート面から離れた時には、クッションス
プール1はスプリング3の押出し力と、自重によって、
ピストン15の底面から突出状態となる。ポートAから
圧油が排出されると、ピストン15が下降し、初めにク
ッションスプール1がボトム14上面に当接し、圧力室
Bの圧力により、ベアリング5が筒孔C内の段部13の
シート面fに当接する。次にピストン15がボトム上面
に当接するまでの間、圧力室Bの油は、クッションスプ
ール1に形成したオリフィスb1〜b4を介して、ポート
Aに放出される。ピストン15の下降により、オリフィ
スb1〜b4は、上から順番にベアリング5により塞がれ
るので、オリフィス全体の開度は、徐々に小さくなって
行く。このように、オリフィスb1〜b4を介して徐々に
圧油を排出することで、クッション機能を発揮する。
When pressure oil is supplied from the port A, the bearing 5 slightly moves to the bottom 14 side, and the pressure oil passes from the cylindrical hole C through the slit J of the bearing 5 and the lower end slit H of the piston 15. Is supplied to the pressure chamber B outside the piston 15. As a result, the piston 15 moves up. When the piston 15 is separated from the seat surface, the cushion spool 1 is pushed by the pushing force of the spring 3 and its own weight.
The piston 15 is projected from the bottom surface. When the pressure oil is discharged from the port A, the piston 15 descends, the cushion spool 1 first contacts the upper surface of the bottom 14, and the pressure in the pressure chamber B causes the bearing 5 to seat on the step portion 13 in the cylindrical hole C. Contact the surface f. Next, the oil in the pressure chamber B is discharged to the port A through the orifices b 1 to b 4 formed in the cushion spool 1 until the piston 15 contacts the bottom upper surface. The descent of the piston 15, the orifice b 1 ~b 4, since is closed by the bearing 5 in order from the top, the opening of the entire orifice, gradually becomes smaller. In this way, the cushioning function is exerted by gradually discharging the pressure oil via the orifices b 1 to b 4 .

【0005】[0005]

【発明が解決しようとする課題】上記のようなシリンダ
クッションは、部品点数が多く、それに伴い組立工数が
多いという問題があった。また、シリンダ15の筒孔C
内にスプリング3を装着するために、その分、深い筒孔
を形成しなければならなかった。そのため、加工時間も
かかり、製造コストが高くなった。そこで、この発明の
課題は、構造が簡単で、部品点数も少なく、低コストで
製造できるシリンダクッションを提供することである。
The cylinder cushion as described above has a problem that the number of parts is large and the number of assembling steps is accordingly large. Also, the cylinder hole C of the cylinder 15
In order to mount the spring 3 therein, a deep cylindrical hole had to be formed correspondingly. Therefore, processing time is required and manufacturing cost is increased. Therefore, an object of the present invention is to provide a cylinder cushion that has a simple structure, has a small number of parts, and can be manufactured at low cost.

【0006】[0006]

【課題を解決するための手段】この発明のシリンダクッ
ションは、シリンダチューブの一端を塞ぐボトムと、シ
リンダチューブ内を軸方向に移動可能なピストンと、ボ
トムに形成した給排ポートと、内部が上記給排ポートと
連通し、ボトムと一体に形成した筒部と、上記ピストン
に設けた筒孔と、この筒孔の内周下方に設けた段部と、
段部を介して形成した大径部と、段部に形成し筒孔の軸
に垂直なシート面と、大径部の側面に設置するストッパ
と、このストッパとシート面との間に装着する環状部材
と、この環状部材の外周と筒孔の内周間に形成された自
由流れ流路とを備え、上記環状部材は、内径が筒部の外
径より僅かに大きく、筒部との間に間隙を有し、軸方向
に移動可能であるとともに、ピストンの上昇時には、環
状部材がシート面から離れ、自由流れ流路が開き、ピス
トンが下降して環状部材が筒部に嵌合すると、ピストン
とシリンダチューブとボトムと環状部材とに囲まれた圧
力室内の圧力上昇によって環状部材がシート面に当接し
て、自由流れ流路を閉じ、上記圧力室の油が環状部材と
筒部との間の間隙を介して流出することを特徴とする。
A cylinder cushion according to the present invention has a bottom for closing one end of a cylinder tube, a piston axially movable in the cylinder tube, a supply / discharge port formed in the bottom, and the inside as described above. A cylindrical portion that is formed integrally with the bottom and communicates with the supply / discharge port, a cylindrical hole provided in the piston, and a stepped portion provided below the inner periphery of the cylindrical hole,
A large-diameter portion formed through the step portion, a seat surface formed on the step portion and perpendicular to the axis of the cylindrical hole, a stopper installed on the side surface of the large-diameter portion, and mounted between the stopper and the seat surface. An annular member and a free-flow passage formed between the outer periphery of the annular member and the inner periphery of the tubular hole are provided, and the annular member has an inner diameter slightly larger than an outer diameter of the tubular portion, When the piston rises, the annular member separates from the seat surface, the free flow passage opens, and the piston descends to fit the annular member into the tubular portion. The annular member abuts the seat surface due to the pressure increase in the pressure chamber surrounded by the piston, the cylinder tube, the bottom, and the annular member, and closes the free flow passage, and the oil in the pressure chamber causes the annular member and the tubular portion It is characterized by flowing out through a gap between them.

【0007】[0007]

【発明の実施の形態】図1〜図3に示す第1実施例は、
シリンダチューブ16の一端をボトム14で塞ぎ、シリ
ンダチューブ16内には軸方向に移動可能なピストン1
5を備えている。ボトム14には、給排ポートAと、内
部がこの給排ポートAと連通し、ボトム14と一体に形
成した筒部Dとを形成している。ピストン15には、筒
部Dが挿入できる筒孔Cを形成し、筒孔Cの内周下方に
は、段部13と、段部13を介して大径部17とを形成
し、段部13の筒孔Cの軸に垂直な面をシート面fとす
る。大径部17の側面には環状のストッパ12を設置
し、このストッパ12とシート面fとの間に環状部材1
1を装着する。この環状部材11の外径は大径部17内
径より小さく、その間に自由流れ流路gを形成する。環
状部材11の内径は、筒部Dの外径より僅かに大きく、
筒部Dとの間に間隙eを有し、環状部材11は軸方向に
移動可能である。また、ピストン15の下端には、複数
のスリットHを形成している。
BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment shown in FIGS.
One end of the cylinder tube 16 is closed by the bottom 14, and the piston 1 movable in the axial direction is provided in the cylinder tube 16.
5 is provided. The bottom 14 is formed with a supply / discharge port A and a cylindrical portion D, the inside of which communicates with the supply / discharge port A and is formed integrally with the bottom 14. A cylindrical hole C into which the cylindrical portion D can be inserted is formed in the piston 15, and a step portion 13 and a large-diameter portion 17 via the step portion 13 are formed below the inner periphery of the cylindrical hole C. A surface perpendicular to the axis of the cylindrical hole C of 13 is a seat surface f. An annular stopper 12 is installed on the side surface of the large diameter portion 17, and the annular member 1 is provided between the stopper 12 and the seat surface f.
Wear 1. The outer diameter of the annular member 11 is smaller than the inner diameter of the large diameter portion 17, and a free flow passage g is formed between them. The inner diameter of the annular member 11 is slightly larger than the outer diameter of the tubular portion D,
The annular member 11 has a gap e between it and the tubular portion D, and is movable in the axial direction. A plurality of slits H are formed at the lower end of the piston 15.

【0008】図1、図3は、ピストン15の最下降状態
で、シリンダが最縮状態である。図3の状態で、ポート
Aから圧油を供給すると、図1に示すように、油圧は、
は筒部Dを介して環状部材11に作用するので、環状部
材11が段部13に形成したシート面fを離れ、自由流
れ流路gを開く。図4は、自由流れ流路g付近の拡大図
で、環状部材11の下端に切り欠き11aを形成して、
この切り欠き11aとストッパ12との間が、自由流れ
流路gを連通させている。圧油は、自由流れ流路gか
ら、スリットHを介して圧力室Bに供給され、ピストン
15は上昇する。環状部材11もピストン15とともに
上昇し、筒部Dから抜ける。この状態で、ポートAから
圧油を排出すると、圧力室Bの圧力が下がり、ピストン
15が下降する。ピストン15が、最下降状態に近づ
き、図2に示すように、環状部材11が筒部Dに嵌合す
ると、圧力室Bの圧力が上昇する。
1 and 3 show the piston 15 in the lowest position and the cylinder in the lowest position. When the pressure oil is supplied from the port A in the state of FIG. 3, the hydraulic pressure becomes as shown in FIG.
Acts on the annular member 11 via the tubular portion D, so that the annular member 11 leaves the seat surface f formed on the step portion 13 and opens the free flow passage g. FIG. 4 is an enlarged view of the vicinity of the free flow passage g, in which the notch 11a is formed at the lower end of the annular member 11,
The free flow passage g is communicated between the notch 11a and the stopper 12. The pressure oil is supplied from the free flow passage g to the pressure chamber B through the slit H, and the piston 15 moves up. The annular member 11 also rises together with the piston 15 and comes out of the tubular portion D. When the pressure oil is discharged from the port A in this state, the pressure in the pressure chamber B is lowered and the piston 15 is lowered. When the piston 15 approaches the lowest position and the annular member 11 is fitted in the tubular portion D as shown in FIG. 2, the pressure in the pressure chamber B rises.

【0009】そして、環状部材11が、シート面fに当
接して、自由流れ流路gを閉じる。自由流れ流路gを閉
じた状態では、圧力室Bの圧油は、筒部Dの外周と環状
部材11の内周間の僅かな間隙eを介して流出すること
になる。図2に示す状態から、図3に示す最下降状態ま
での間、圧力室B内の圧油は、間隙eのみを介してポー
トAに排出される。この間隙eが、絞りとなって、クッ
ション機能を発揮するのである。図5は、環状部材11
と、ストッパ12の形状が、第1実施例とは異なる第2
実施例の、自由流れ流路g付近の拡大図(図5(a))
と、ストッパ12である(図5(b))。ストッパ12
は、図5(b)のように合口部12aを開口しているの
で、その合口部12aによって自由流れ流路gを連通さ
せることができる。第1実施例の環状部材11のよう
な、切り欠き11aが不要となる。その他の構成及び作
用は、は第1実施例と同様であるので、説明は省略す
る。このようなシリンダクッションでは、従来例のもの
と比べて、部品点数が少なくなったし、スプリングを設
置するために、筒孔Cを深く加工する必要も無くなっ
た。また、大径部17の内周と環状部材11の外周間の
自由流れ流路gは、ボトム14とシリンダチューブ16
との溶接時の偏心や、ピストン取付時の偏心等による、
環状部材11と筒部Dとの芯ずれを調芯する効果もあ
る。
Then, the annular member 11 contacts the seat surface f to close the free flow passage g. When the free flow passage g is closed, the pressure oil in the pressure chamber B flows out through a slight gap e between the outer circumference of the cylindrical portion D and the inner circumference of the annular member 11. From the state shown in FIG. 2 to the most lowered state shown in FIG. 3, the pressure oil in the pressure chamber B is discharged to the port A through only the gap e. This gap e serves as a diaphragm to exert a cushioning function. FIG. 5 shows the annular member 11
And the shape of the stopper 12 is different from that of the first embodiment.
Enlarged view of the vicinity of the free flow channel g of the embodiment (FIG. 5A)
And the stopper 12 (FIG. 5B). Stopper 12
Since the abutment portion 12a is opened as shown in FIG. 5B, the abutment portion 12a can communicate the free flow passage g. The notch 11a like the annular member 11 of the first embodiment is unnecessary. The rest of the configuration and operation are the same as in the first embodiment, so description will be omitted. In such a cylinder cushion, the number of parts is smaller than that of the conventional example, and it is not necessary to deeply machine the cylindrical hole C in order to install the spring. Further, the free flow passage g between the inner circumference of the large diameter portion 17 and the outer circumference of the annular member 11 has a bottom 14 and a cylinder tube 16.
Due to eccentricity when welding with
There is also an effect of aligning the misalignment between the annular member 11 and the tubular portion D.

【0010】[0010]

【発明の効果】この発明のシリンダクッションは、構造
が簡単で、部品点数が少なく、加工も容易なため、低コ
ストで製造できるようになった。
The cylinder cushion of the present invention has a simple structure, a small number of parts, and is easy to process, so that it can be manufactured at low cost.

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

【図1】本実施例の断面図であり、ピストン最下降状態
で、ピストン上昇開始時の状態である。
FIG. 1 is a cross-sectional view of the present embodiment, which is a state in which a piston is in the lowest position and a piston starts to move up.

【図2】本実施例の断面図であり、ピストン下降途中の
クッション行程中である。
FIG. 2 is a cross-sectional view of the present embodiment, which is in the process of cushioning while the piston is descending.

【図3】本実施例の断面図であり、クッション行程が終
了したピストン最下降状態である。
FIG. 3 is a cross-sectional view of the present embodiment, showing the piston in the lowest position after the cushion stroke.

【図4】図1の部分拡大図である。FIG. 4 is a partially enlarged view of FIG.

【図5】第2実施例の断面図で、(a)は自由流れ流路
付近の拡大図であり、(b)はストッパの形状を表す図
である。
FIG. 5 is a cross-sectional view of the second embodiment, (a) is an enlarged view of the vicinity of a free flow passage, and (b) is a view showing the shape of a stopper.

【図6】従来例の断面図である。FIG. 6 is a sectional view of a conventional example.

【符号の説明】[Explanation of symbols]

A ポート B 圧力室 C 筒孔 D 筒部 e 間隙 f シート面 g 自由流れ流路 11 環状部材 12 ストッパ 13 段部 14 ボトム 15 ピストン 16 シリンダチューブ 17 大径部 A port B Pressure chamber C Cylinder hole D Cylinder part e Gap f Seat surface g Free flow channel 11 Annular member 12 Stopper 13 Step part 14 Bottom 15 Piston 16 Cylinder tube 17 Large diameter part

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 シリンダチューブの一端を塞ぐボトム
と、シリンダチューブ内を軸方向に移動可能なピストン
と、ボトムに形成した給排ポートと、内部が上記給排ポ
ートと連通し、ボトムと一体に形成した筒部と、上記ピ
ストンに設けた筒孔と、この筒孔の内周下方に設けた段
部と、段部を介して形成した大径部と、段部に形成し筒
孔の軸に垂直なシート面と、大径部の側面に設置するス
トッパと、このストッパとシート面との間に装着する環
状部材と、この環状部材の外周と筒孔の内周間に形成さ
れた自由流れ流路とを備え、上記環状部材は、内径が筒
部の外径より僅かに大きく、筒部との間に間隙を有し、
軸方向に移動可能であるとともに、ピストンの上昇時に
は、環状部材がシート面から離れ、自由流れ流路が開
き、ピストンが下降して環状部材が筒部に嵌合すると、
ピストンとシリンダチューブとボトムと環状部材とに囲
まれた圧力室内の圧力上昇によって環状部材がシート面
に当接して、自由流れ流路を閉じ、上記圧力室の油が環
状部材と筒部との間の間隙を介して流出するシリンダク
ッション。
1. A bottom that closes one end of a cylinder tube, a piston that can move in the cylinder tube in an axial direction, a supply / discharge port formed in the bottom, and the inside communicates with the supply / discharge port, and is integrated with the bottom. The formed cylinder portion, the cylinder hole provided in the piston, the step portion provided below the inner circumference of the cylinder hole, the large diameter portion formed through the step portion, and the shaft of the cylinder hole formed in the step portion. A seat surface perpendicular to the seat, a stopper installed on the side surface of the large diameter portion, an annular member mounted between the stopper and the seat surface, and a free member formed between the outer circumference of the annular member and the inner circumference of the cylindrical hole. A flow channel, the annular member has an inner diameter slightly larger than the outer diameter of the tubular portion, and has a gap between the tubular member and
While being movable in the axial direction, when the piston rises, the annular member separates from the seat surface, the free flow passage opens, the piston descends, and the annular member fits into the tubular portion.
The annular member abuts the seat surface due to the pressure increase in the pressure chamber surrounded by the piston, the cylinder tube, the bottom, and the annular member, and closes the free flow passage, and the oil in the pressure chamber causes the annular member and the tubular portion A cylinder cushion that flows out through the gap between them.
JP12088396A 1996-04-17 1996-04-17 Cylinder cushion Pending JPH09280289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12088396A JPH09280289A (en) 1996-04-17 1996-04-17 Cylinder cushion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12088396A JPH09280289A (en) 1996-04-17 1996-04-17 Cylinder cushion

Publications (1)

Publication Number Publication Date
JPH09280289A true JPH09280289A (en) 1997-10-28

Family

ID=14797338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12088396A Pending JPH09280289A (en) 1996-04-17 1996-04-17 Cylinder cushion

Country Status (1)

Country Link
JP (1) JPH09280289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085368A (en) * 2005-09-20 2007-04-05 Kayaba Ind Co Ltd Fluid pressure cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085368A (en) * 2005-09-20 2007-04-05 Kayaba Ind Co Ltd Fluid pressure cylinder

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