JPH02149686U - - Google Patents
Info
- Publication number
- JPH02149686U JPH02149686U JP5989089U JP5989089U JPH02149686U JP H02149686 U JPH02149686 U JP H02149686U JP 5989089 U JP5989089 U JP 5989089U JP 5989089 U JP5989089 U JP 5989089U JP H02149686 U JPH02149686 U JP H02149686U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- jib
- extension
- fixed
- built
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Jib Cranes (AREA)
Description
第１図は本考案のブーム内蔵式ジブの張出装置
の説明図、第２図は同油圧・電気回路図、第３図
は従来のブーム内蔵式ジブの張出装置の説明図で
ある。
固定ブーム……１、ブーム……２，３，４、ジ
ブ……Ｂ、ジブ張り出し用シーブ……８、ジブ張
り出し用ワイヤロープ……９，１０、張力検出手
段……１３。
FIG. 1 is an explanatory diagram of a boom built-in jib extension device of the present invention, FIG. 2 is a hydraulic and electrical circuit diagram thereof, and FIG. 3 is an explanatory diagram of a conventional boom built-in jib extension device. Fixed boom...1, boom...2, 3, 4, jib...B, sheave for extending the jib...8, wire rope for extending the jib...9, 10, tension detection means...13.
Claims (1)
嵌挿し、その最先端のブーム内にジブを伸縮自在
に嵌挿してなるブーム内蔵式ジブの張出装置であ
つて、前記最先端のブームに設けたジブ張出し用
シーブを経由してジブの基端部と前記固定ブーム
の適所間にワイヤーロープを張設し、前記ブーム
の伸長動を利用してジブを伸長させるものにおい
て、前記固定ブーム適所に、前記ワイヤーロープ
に所定値以上の張力が作用したときを検出して作
動する張力検出手段を設け、この張力検出手段が
作動したとき前記ブームの伸長動を停止又は伸長
力を制限するよう構成したことを特徴とするブー
ム内蔵式ジブの張出装置。 A jib extension device with a built-in boom, in which a plurality of booms are telescopically inserted one after another into a fixed boom, and a jib is telescopically inserted into the most advanced boom, the device being installed in the most advanced boom. A wire rope is stretched between the base end of the jib and the fixed boom at a proper position via a jib extension sheave, and the jib is extended by utilizing the extension movement of the boom, wherein the jib is extended at the fixed boom at the proper position. , a tension detection means that is activated by detecting when a tension of a predetermined value or more is applied to the wire rope is provided, and when the tension detection means is activated, the extension movement of the boom is stopped or the extension force is limited. A jib extension device with a built-in boom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5989089U JPH02149686U (en) | 1989-05-23 | 1989-05-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5989089U JPH02149686U (en) | 1989-05-23 | 1989-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02149686U true JPH02149686U (en) | 1990-12-20 |
Family
ID=31586786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5989089U Pending JPH02149686U (en) | 1989-05-23 | 1989-05-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02149686U (en) |
-
1989
- 1989-05-23 JP JP5989089U patent/JPH02149686U/ja active Pending
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