JPH0484048U - - Google Patents
Info
- Publication number
- JPH0484048U JPH0484048U JP12951290U JP12951290U JPH0484048U JP H0484048 U JPH0484048 U JP H0484048U JP 12951290 U JP12951290 U JP 12951290U JP 12951290 U JP12951290 U JP 12951290U JP H0484048 U JPH0484048 U JP H0484048U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic cylinder
- double
- oil
- acting hydraulic
- acting
- 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.)
- Granted
Links
- 239000003921 oil Substances 0.000 claims 10
- 230000008602 contraction Effects 0.000 claims 5
- 239000010720 hydraulic oil Substances 0.000 claims 5
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Invalid Beds And Related Equipment (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Description
第１図は本考案の歩み板回動用油圧シリンダの
制御装置の説明図、第２図は歩み板回動用油圧シ
リンダを取付けた重量物運搬車輛を説明する説明
図、第３図は従来の歩み板回動用油圧シリンダの
制御装置の説明図である。
支軸……４、歩み板……１，１、複動油圧シリ
ンダ……６、油圧制御弁……１５、圧油源……７
、タンク……８。
Figure 1 is an explanatory diagram of the control device for the hydraulic cylinder for rotating the footplates of the present invention, Figure 2 is an explanatory diagram for explaining a heavy goods transport vehicle equipped with the hydraulic cylinder for rotating the footplates, and Figure 3 is an explanatory diagram of the conventional footplate rotation hydraulic cylinder. It is an explanatory view of a control device of a hydraulic cylinder for plate rotation. Support shaft...4, Step board...1,1, Double acting hydraulic cylinder...6, Hydraulic control valve...15, Pressure oil source...7
, tank...8.
Claims (1)
て回動可能に取付けた歩み板を回動駆動する複動
油圧シリンダ、特に前記歩み板をその伸長動によ
り起立回動させその縮小動により倒伏回動させる
よう前記歩み板に関連させた複動油圧シリンダの
制御装置であつて、 複動油圧シリンダの伸長動作側油室と縮小動作
側油室へ作動油を給排制御する油圧制御弁を、前
記複動油圧シリンダの両油室への給排油路を閉塞
して当該複動油圧シリンダを停止保持する中立操
作位置と、複動油圧シリンダの伸長動作側油室に
作動油を供給すると共に縮小動作側油室からの作
動油をタンクに開放する起立操作位置、複動油圧
シリンダの縮小動作側油室に作動油を供給すると
共に伸長動作側油室からの作動油をタンクに開放
する倒伏操作位置および少なくとも複動油圧シリ
ンダの伸長動作側油室の作動油をタンクに開放し
て複動油圧シリンダに作用する縮小方向の力を自
由支持状態とするフリー操作位置の４操作位置を
有する油圧制御弁で構成したことを特徴とする歩
み板回動用油圧シリンダの制御装置。[Scope of Claim for Utility Model Registration] A double-acting hydraulic cylinder that rotationally drives a footboard rotatably attached via a support shaft along the rear end edge of a cargo platform of a heavy goods transport vehicle, in particular, a double-acting hydraulic cylinder that drives the footboard in its extension motion. A control device for a double-acting hydraulic cylinder associated with the footboard so as to cause the double-acting hydraulic cylinder to rotate upright and rotate to fall down due to its contraction, the double-acting hydraulic cylinder being actuated to an oil chamber on an extension side and an oil chamber on a contraction side of the double-acting hydraulic cylinder. A hydraulic control valve that controls the supply and discharge of oil is placed in a neutral operating position in which the double-acting hydraulic cylinder is stopped and held by blocking the oil supply and discharge passages to both oil chambers of the double-acting hydraulic cylinder, and the double-acting hydraulic cylinder is extended. An upright operation position that supplies hydraulic oil to the oil chamber on the operating side and releases hydraulic oil from the oil chamber on the contraction side to the tank, and supplies hydraulic oil to the oil chamber on the contraction side of the double-acting hydraulic cylinder and oil on the extension side. A lodging operation position where the hydraulic oil from the chamber is released into the tank, and at least the hydraulic oil in the oil chamber on the extension operation side of the double-acting hydraulic cylinder is released into the tank, so that the force in the contraction direction acting on the double-acting hydraulic cylinder is released into the free support state. 1. A control device for a hydraulic cylinder for rotating a footboard, comprising a hydraulic control valve having four free operation positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129512U JP2578110Y2 (en) | 1990-11-30 | 1990-11-30 | Control device of hydraulic cylinder for step plate rotation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129512U JP2578110Y2 (en) | 1990-11-30 | 1990-11-30 | Control device of hydraulic cylinder for step plate rotation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0484048U true JPH0484048U (en) | 1992-07-22 |
| JP2578110Y2 JP2578110Y2 (en) | 1998-08-06 |
Family
ID=31876912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990129512U Expired - Lifetime JP2578110Y2 (en) | 1990-11-30 | 1990-11-30 | Control device of hydraulic cylinder for step plate rotation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2578110Y2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4839402A (en) * | 1971-09-23 | 1973-06-09 | ||
| JPS5352166U (en) * | 1976-10-06 | 1978-05-04 | ||
| JPS59172641U (en) * | 1983-05-09 | 1984-11-17 | 株式会社 多田野鉄工所 | lorry footboard |
| JPH0210137U (en) * | 1988-07-04 | 1990-01-23 |
-
1990
- 1990-11-30 JP JP1990129512U patent/JP2578110Y2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4839402A (en) * | 1971-09-23 | 1973-06-09 | ||
| JPS5352166U (en) * | 1976-10-06 | 1978-05-04 | ||
| JPS59172641U (en) * | 1983-05-09 | 1984-11-17 | 株式会社 多田野鉄工所 | lorry footboard |
| JPH0210137U (en) * | 1988-07-04 | 1990-01-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2578110Y2 (en) | 1998-08-06 |
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