JPS57127024A - Safety device for hydraulic excavator - Google Patents

Safety device for hydraulic excavator

Info

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
Application number
JP1239581A
Other languages
Japanese (ja)
Other versions
JPH0257165B2 (en
Inventor
Michiaki Igarashi
Katsu Hirozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP1239581A priority Critical patent/JPS57127024A/en
Publication of JPS57127024A publication Critical patent/JPS57127024A/en
Publication of JPH0257165B2 publication Critical patent/JPH0257165B2/ja
Granted legal-status Critical Current

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

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.
JP1239581A 1981-01-30 1981-01-30 Safety device for hydraulic excavator Granted JPS57127024A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
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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