JPS5649404A - Multistage stretching boom - Google Patents
Multistage stretching boomInfo
- Publication number
- JPS5649404A JPS5649404A JP12366879A JP12366879A JPS5649404A JP S5649404 A JPS5649404 A JP S5649404A JP 12366879 A JP12366879 A JP 12366879A JP 12366879 A JP12366879 A JP 12366879A JP S5649404 A JPS5649404 A JP S5649404A
- Authority
- JP
- Japan
- Prior art keywords
- boom
- stretching
- wedge
- stretched
- base end
- 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
Abstract
PURPOSE: To surely lock a boom without a special requirement of a precise lengthwise accuracy by using a wedge device as a means which locks an intermediate boom on a base end boom when the intermediate boom is stretched.
CONSTITUTION: Once supplied from a line 11, an oil pressure is carried into a stretching oil chamber 4a of a primay cylinder device 4 to stretched along the device 4. An intermediate boom 2 is stretched with a front end boom 3 with respect to a base end boom 1. Immediately before the device 4 completes its stretching, a spool 15 of an intermediate boom 2 is forced up by an inclined face 18 so that a change-over valve 7 is shifted. An oil pressure in the oil chamber 4a then goes into a stretching oil chamber 5a of a secondary cylinder device 5 through the valve 7 and a line 13 to stretch the front end boom 3. When the boom 3 beings stretching, its base end 3a detaches from one end 8a of a wedge 8. The wedge 8 is securely fit to the internal face of the boom 1 under the force of a spring 9 to lock it up.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12366879A JPS5649404A (en) | 1979-09-25 | 1979-09-25 | Multistage stretching boom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12366879A JPS5649404A (en) | 1979-09-25 | 1979-09-25 | Multistage stretching boom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5649404A true JPS5649404A (en) | 1981-05-06 |
| JPH022001B2 JPH022001B2 (en) | 1990-01-16 |
Family
ID=14866332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12366879A Granted JPS5649404A (en) | 1979-09-25 | 1979-09-25 | Multistage stretching boom |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5649404A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4889038A (en) * | 1988-07-18 | 1989-12-26 | Tovel Manufacturing Limited | Hydraulic cylinder |
| JP2016196903A (en) * | 2015-04-02 | 2016-11-24 | Ｋｙｂ−Ｙｓ株式会社 | Control valve |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5337221B2 (en) * | 2011-10-07 | 2013-11-06 | パスカルエンジニアリング株式会社 | Fluid pressure cylinder and clamping device |
| JP5337323B2 (en) * | 2013-07-05 | 2013-11-06 | パスカルエンジニアリング株式会社 | Position detection device |
| JP5419114B2 (en) * | 2013-07-26 | 2014-02-19 | パスカルエンジニアリング株式会社 | On-off valve mechanism |
| JP2016006353A (en) * | 2015-09-24 | 2016-01-14 | パスカルエンジニアリング株式会社 | Fluid pressure cylinder and clamp device |
| JP6291518B2 (en) * | 2016-04-11 | 2018-03-14 | パスカルエンジニアリング株式会社 | Fluid pressure cylinder and clamping device |
| JP2018109444A (en) * | 2018-02-08 | 2018-07-12 | パスカルエンジニアリング株式会社 | Hydraulic cylinder and clamp device |
-
1979
- 1979-09-25 JP JP12366879A patent/JPS5649404A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4889038A (en) * | 1988-07-18 | 1989-12-26 | Tovel Manufacturing Limited | Hydraulic cylinder |
| JP2016196903A (en) * | 2015-04-02 | 2016-11-24 | Ｋｙｂ−Ｙｓ株式会社 | Control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH022001B2 (en) | 1990-01-16 |
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