JPS57127024A - Safety device for hydraulic excavator - Google Patents
Safety device for hydraulic excavatorInfo
- Publication number
- JPS57127024A JPS57127024A JP1239581A JP1239581A JPS57127024A JP S57127024 A JPS57127024 A JP S57127024A JP 1239581 A JP1239581 A JP 1239581A JP 1239581 A JP1239581 A JP 1239581A JP S57127024 A JPS57127024 A JP S57127024A
- Authority
- JP
- Japan
- Prior art keywords
- boom
- arm
- angle
- coupling
- returned
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2033—Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Shovels (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
PURPOSE:To prevent contacting of a working equipment with a vehicle body, by a method wherein, in an excavator equipped with two booms, when an angle, formed with one boom and the other boom, and an angle, formed with the other boom and an arm, attain a given angle, control valves for the arm and the other boom are returned to a neutral position. CONSTITUTION:A second boom 1 is pivotably connected to a first boom 2, an arm 3 to the second boom 2, and a bucket 4 to the arm 3. A parallel 4-kunckle link Lp consists of rod materials L1-L4, a coupling A is positioned at the connection of the boom 1 to the boom 2, a coupling B at the connection of the boom 2 to the arm 3, and a coupling C at the given location of the arm 3. As a result, the shape of the link Lp changes resulting from the rotation of the arm 3. In case the sum of the angle alpha, formed with said boom 1 and the boom 2, and the angle beta, formed with the boom 2 and the arm 3, are reduced to less than a given angle, the control valves for the boom 2 and the arm 3 are returned to a neutral position by means of limit switches 5 and 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1239581A JPS57127024A (en) | 1981-01-30 | 1981-01-30 | Safety device for hydraulic excavator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1239581A JPS57127024A (en) | 1981-01-30 | 1981-01-30 | Safety device for hydraulic excavator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57127024A true JPS57127024A (en) | 1982-08-07 |
JPH0257165B2 JPH0257165B2 (en) | 1990-12-04 |
Family
ID=11804074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1239581A Granted JPS57127024A (en) | 1981-01-30 | 1981-01-30 | Safety device for hydraulic excavator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57127024A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639361U (en) * | 1986-07-02 | 1988-01-21 | ||
JPS639360U (en) * | 1986-07-01 | 1988-01-21 | ||
JPS6314666U (en) * | 1986-07-14 | 1988-01-30 | ||
JPS63219790A (en) * | 1987-03-09 | 1988-09-13 | 日立建機株式会社 | Derricking safety device for earth drill front |
JPH01271535A (en) * | 1988-04-22 | 1989-10-30 | Yanmar Diesel Engine Co Ltd | Dangerous area avoiding device for work machine |
JPH072563U (en) * | 1993-07-21 | 1995-01-13 | 日立建機株式会社 | Hydraulic excavator front drive circuit |
JPH08233U (en) * | 1995-08-03 | 1996-02-06 | 日立建機株式会社 | Hydraulic excavator front drive circuit |
US8142132B2 (en) | 2009-01-05 | 2012-03-27 | Cnh America Llc | Automatic over-center system |
-
1981
- 1981-01-30 JP JP1239581A patent/JPS57127024A/en active Granted
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639360U (en) * | 1986-07-01 | 1988-01-21 | ||
JPS639361U (en) * | 1986-07-02 | 1988-01-21 | ||
JPS6314666U (en) * | 1986-07-14 | 1988-01-30 | ||
JPS63219790A (en) * | 1987-03-09 | 1988-09-13 | 日立建機株式会社 | Derricking safety device for earth drill front |
JPH0469718B2 (en) * | 1987-03-09 | 1992-11-06 | Hitachi Construction Machinery | |
JPH01271535A (en) * | 1988-04-22 | 1989-10-30 | Yanmar Diesel Engine Co Ltd | Dangerous area avoiding device for work machine |
JPH072563U (en) * | 1993-07-21 | 1995-01-13 | 日立建機株式会社 | Hydraulic excavator front drive circuit |
JPH08233U (en) * | 1995-08-03 | 1996-02-06 | 日立建機株式会社 | Hydraulic excavator front drive circuit |
US8142132B2 (en) | 2009-01-05 | 2012-03-27 | Cnh America Llc | Automatic over-center system |
Also Published As
Publication number | Publication date |
---|---|
JPH0257165B2 (en) | 1990-12-04 |
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