JPS55152229A - Multistage extension arm of hydraulic shovel - Google Patents

Multistage extension arm of hydraulic shovel

Info

Publication number
JPS55152229A
JPS55152229A JP5877379A JP5877379A JPS55152229A JP S55152229 A JPS55152229 A JP S55152229A JP 5877379 A JP5877379 A JP 5877379A JP 5877379 A JP5877379 A JP 5877379A JP S55152229 A JPS55152229 A JP S55152229A
Authority
JP
Japan
Prior art keywords
extension arm
unit
signal
supporting
direction load
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
JP5877379A
Other languages
Japanese (ja)
Other versions
JPS6227212B2 (en
Inventor
Ryutaro Yoritomi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP5877379A priority Critical patent/JPS55152229A/en
Priority to CA339,500A priority patent/CA1132101A/en
Priority to FR7928730A priority patent/FR2442304A1/en
Priority to DE19792947161 priority patent/DE2947161A1/en
Publication of JPS55152229A publication Critical patent/JPS55152229A/en
Priority to US06/327,911 priority patent/US4436476A/en
Publication of JPS6227212B2 publication Critical patent/JPS6227212B2/ja
Granted legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/46—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor
    • E02F3/47—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor with grab buckets

Abstract

PURPOSE: To prevent an overload caused by the large moment applied to a boom by holding substantially the vertical position without inclining the extension arm by the preliminary compressed spring within the range of limited load.
CONSTITUTION: The utmost outer pipe 10a or the adjacent intermediate pipe 10b of an extension arm 10 is provided with a horizontal direction load applied to the intermediate of both pipes 10a, 10b, and/or a supporting unit 32 supporting the longitudinal direction load, and a horizontal direction load limiter 30 having a signal unit giving a signal in exceeding the fixed supporting force of the supporting unit 32. Besides, the relief unit for the rotating system of a boom or the relief unit for the arm operating hydraulic cylinder 8 actuated by the signal thereof is provided to prevent said both pipes 10a, 10b from applying the overload.
COPYRIGHT: (C)1980,JPO&Japio
JP5877379A 1978-11-24 1979-05-14 Multistage extension arm of hydraulic shovel Granted JPS55152229A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5877379A JPS55152229A (en) 1979-05-14 1979-05-14 Multistage extension arm of hydraulic shovel
CA339,500A CA1132101A (en) 1978-11-24 1979-11-08 Excavator having telescopic arm assembly
FR7928730A FR2442304A1 (en) 1978-11-24 1979-11-21 TUBULAR DEVICE FOR USE AS AN ARM IN AN EXCAVATOR
DE19792947161 DE2947161A1 (en) 1978-11-24 1979-11-22 ROD AS AN ARM FOR AN EXCAVATOR
US06/327,911 US4436476A (en) 1978-11-24 1981-12-07 Rod device for use as an arm of an excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5877379A JPS55152229A (en) 1979-05-14 1979-05-14 Multistage extension arm of hydraulic shovel

Publications (2)

Publication Number Publication Date
JPS55152229A true JPS55152229A (en) 1980-11-27
JPS6227212B2 JPS6227212B2 (en) 1987-06-12

Family

ID=13093861

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5877379A Granted JPS55152229A (en) 1978-11-24 1979-05-14 Multistage extension arm of hydraulic shovel

Country Status (1)

Country Link
JP (1) JPS55152229A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6294142U (en) * 1985-12-03 1987-06-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6294142U (en) * 1985-12-03 1987-06-16
JPH0351403Y2 (en) * 1985-12-03 1991-11-05

Also Published As

Publication number Publication date
JPS6227212B2 (en) 1987-06-12

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