JPS5483261A - Multistage stretchable boom length detector - Google Patents

Multistage stretchable boom length detector

Info

Publication number
JPS5483261A
JPS5483261A JP15227777A JP15227777A JPS5483261A JP S5483261 A JPS5483261 A JP S5483261A JP 15227777 A JP15227777 A JP 15227777A JP 15227777 A JP15227777 A JP 15227777A JP S5483261 A JPS5483261 A JP S5483261A
Authority
JP
Japan
Prior art keywords
boom
ultrasonic wave
boom length
base
voltage
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
Application number
JP15227777A
Other languages
Japanese (ja)
Inventor
Takakimi Yamamoto
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.)
Tadano Ltd
Original Assignee
Tadano Iron Works Co 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 Tadano Iron Works Co Ltd filed Critical Tadano Iron Works Co Ltd
Priority to JP15227777A priority Critical patent/JPS5483261A/en
Publication of JPS5483261A publication Critical patent/JPS5483261A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enhance the freight handling work in safety by reflecting the ultrasonic wave from a base boom on the endmost reflecting plate of inside boom and measuring the time delay required for reciprocating a multistage stretchable boom via the ultrasonic wave to detect accurately the boom length.
CONSTITUTION: There are provided an ultrasonic wave generating speaker 4, receiving microphone 8 arranged at the base end of a base boom 1, and a reflecting plate 7 provided in the internal box 3 at the end of a boom A. Since the ultrasonic wave irradiated from the speaker 4 is reflected on the plate 7 into the microphone 8 and fed through an amplifier 9, and filter 10 where unnecessary ultrasonic wave is removed, into a phase-to-voltage converter 11 for detecting the phase difference from the ultrasonic wave directly entered from an oscillator 5 to produce a voltage proportional to the difference, the voltage is measured to detect the boom length on an indicator 12.
COPYRIGHT: (C)1979,JPO&Japio
JP15227777A 1977-12-16 1977-12-16 Multistage stretchable boom length detector Pending JPS5483261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15227777A JPS5483261A (en) 1977-12-16 1977-12-16 Multistage stretchable boom length detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15227777A JPS5483261A (en) 1977-12-16 1977-12-16 Multistage stretchable boom length detector

Publications (1)

Publication Number Publication Date
JPS5483261A true JPS5483261A (en) 1979-07-03

Family

ID=15536982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15227777A Pending JPS5483261A (en) 1977-12-16 1977-12-16 Multistage stretchable boom length detector

Country Status (1)

Country Link
JP (1) JPS5483261A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010003636A1 (en) * 2008-07-09 2010-01-14 Moba-Mobile Automation Ag Device and method for determining the length of extension of an extendable machine part
EP2503283A1 (en) * 2011-03-25 2012-09-26 MOBA - Mobile Automation AG Method and device for synchronising ultrasound converters for determining the extension length of an extendible machine section
WO2016023601A1 (en) * 2014-08-12 2016-02-18 Hydac Electronic Gmbh Apparatus for determining at least a portion of the respectively retractable extension length of a telescopic arm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010003636A1 (en) * 2008-07-09 2010-01-14 Moba-Mobile Automation Ag Device and method for determining the length of extension of an extendable machine part
EP2503283A1 (en) * 2011-03-25 2012-09-26 MOBA - Mobile Automation AG Method and device for synchronising ultrasound converters for determining the extension length of an extendible machine section
WO2016023601A1 (en) * 2014-08-12 2016-02-18 Hydac Electronic Gmbh Apparatus for determining at least a portion of the respectively retractable extension length of a telescopic arm

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