JPS5974989U - Four-stage boom extension device - Google Patents
Four-stage boom extension deviceInfo
- Publication number
- JPS5974989U JPS5974989U JP16920982U JP16920982U JPS5974989U JP S5974989 U JPS5974989 U JP S5974989U JP 16920982 U JP16920982 U JP 16920982U JP 16920982 U JP16920982 U JP 16920982U JP S5974989 U JPS5974989 U JP S5974989U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- rod
- cylinder
- side passage
- chamber
- 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
Landscapes
- Jib Cranes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
図面は本考案の実施例を示すもので、第1図は四段ブー
ムの断面図、第2図は油圧配管図である。
1、2.3.4は第1、第2、第3、第4ブーム、5.
6は第1、第2シリンダ、5a、 fiaはボトム室
、5b、6bはロッド室、7,8は口]ンド、9.10
はシーブ、11.12はロープ、13a。
14aはボトム側通路、13b、14bはロッド測道L
15a、 15bはカウンタバランス弁、16は伸
縮切換弁、17はポンプ、18a。
18bは配管。−The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of a four-stage boom, and FIG. 2 is a diagram of hydraulic piping. 1, 2.3.4 are the first, second, third, and fourth booms; 5.
6 is the first and second cylinders, 5a, fia is the bottom chamber, 5b and 6b are the rod chambers, 7 and 8 are the openings, 9.10
is sheave, 11.12 is rope, 13a. 14a is the bottom side passage, 13b and 14b are rod surveying paths L
15a, 15b are counter balance valves, 16 is a telescopic switching valve, 17 is a pump, and 18a. 18b is piping. −
Claims (1)
スコピック状に伸縮可能に嵌挿し、また第1シリンダ部
を第2ブーム2に、ロッド7を第1ブーム1に連結し、
第2シリンダ6のシリンダ部を第3ブームに、ロッド8
を第2ブーム2に連結し、さらに第3ブーム3に枢着し
た収縮シーブ9及び伸長ブーム10に一端を第2ブーム
2に、他端を第4ブーム4に連結した収縮および伸張ロ
ープ11.12を巻掛けてなる四段ブーム伸縮装置にお
いて、第1、第2シリンダ5.6のロッド7.8のそれ
ぞれに、ボトム室5a、5aに連通ずるボトム側通路1
3a、14aと、ロッド室5b。 6bに連通ずるロッド側通路13b、14bを設け、第
1シリンダ5のロッド6に設けた上記両通路13a、
13bをカウンタバランス弁15a。 15bおよび伸縮切換弁16を介してポンプ17に接続
し、第2シリンダ6のロッド7に設けたボトム側通路1
4aを第1シリンダ5のボトム室5aに、ロッド側通路
14bをロッド室5bにそれぞれ配管18a、18bを
介して接続し、上記第1、第2シリンダ5.6の両ボト
ム室5a、5aの受圧面積S□、S2をSl>S2とし
たことを特徴とする四段ブーム伸縮装置。[Claims for Utility Model Registration] The first, second, third, and fourth booms 1.2.3°4 are telescopically telescopically inserted and inserted, and the first cylinder portion is inserted into the second boom 2, Connecting the rod 7 to the first boom 1,
The cylinder part of the second cylinder 6 is connected to the third boom, and the rod 8
is connected to the second boom 2, and further connected to the retractable sheave 9 and the extendable boom 10, which are pivotally connected to the third boom 3. A retractable and extensible rope 11. is connected to the second boom 2 at one end and to the fourth boom 4 at the other end. In the four-stage boom telescoping device, each of the rods 7.8 of the first and second cylinders 5.6 has a bottom side passage 1 communicating with the bottom chambers 5a, 5a.
3a, 14a, and the rod chamber 5b. rod-side passages 13b and 14b communicating with the rod 6b, and both passages 13a provided in the rod 6 of the first cylinder 5;
13b is a counter balance valve 15a. 15b and the bottom side passage 1 connected to the pump 17 via the telescopic switching valve 16 and provided in the rod 7 of the second cylinder 6.
4a is connected to the bottom chamber 5a of the first cylinder 5, and the rod side passage 14b is connected to the rod chamber 5b via piping 18a, 18b, respectively. A four-stage boom extension and retraction device characterized in that the pressure receiving area S□, S2 satisfies Sl>S2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16920982U JPS5974989U (en) | 1982-11-10 | 1982-11-10 | Four-stage boom extension device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16920982U JPS5974989U (en) | 1982-11-10 | 1982-11-10 | Four-stage boom extension device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5974989U true JPS5974989U (en) | 1984-05-21 |
Family
ID=30369718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16920982U Pending JPS5974989U (en) | 1982-11-10 | 1982-11-10 | Four-stage boom extension device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5974989U (en) |
-
1982
- 1982-11-10 JP JP16920982U patent/JPS5974989U/en active Pending
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