Apparatus for suppressing vibratory or quaky movements of mobile type crane
First Claim
1. An apparatus for suppressing vibratory or quaky movements of a mobile type crane having a vehicle body and an engine, said apparatus reproducing, following restarting of the engine, a condition existing prior to engine shut off, comprising:
- a boom including a hydraulic cylinder having operatively opposing first and second oil chambers, the boom pivotally supported on the vehicle body through said hydraulic cylinder for pivoting movements about a horizontal axis;
a direction control valve for respectively, selectively supplying and draining discharge oil pressure to and from the first load-holding oil chamber and the opposing second oil chamber of said hydraulic cylinder;
a counter-balancing valve provided at a position fluidically between said hydraulic cylinder and said direction control valve;
an accumulator selectively fluidically connected to said hydraulic cylinder at a position fluidically between said hydraulic cylinder and said counter-balancing valve and comprising means for suppressing vibrations of said vehicle body;
a mode selector means selectively switchable between a travel mode position wherein said mode selector means comprises means for communicating said first and second oil chambers with each other through a closed circuit in communication with said accumulator and a working mode position wherein said mode selector means comprises means for opening said closed circuit, supplying oil pressure to and from said first and second oil chambers independently of each other and isolating said accumulator from said hydraulic cylinder;
memory means for electronically storing information as to the mode of operation of said mode selector means under engine operating conditions; and
a controller comprising means for reproducing automatically after an in-transit engine cut-off the mode of operation in existence before the engine cut-off, by setting said mode selector means in a reproducing position upon re-starting said engine based on information stored in the memory means.
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Accused Products
Abstract
An apparatus for suppressing vibratory or quaky movements in travel of mobile type cranes, which facilitates the operation of re-starting the vehicle after temporarily stopping the engine, for example, at a gas station for fuel replenishment as well as operations for switching the mode of operation between vehicle travel and working modes. The apparatus includes for this purpose a memory means for storing at least information as to the mode of operation under engine working conditions before an engine cut-off, and a controller adapted to reproduce automatically the mode of operation before the engine cut-off, by setting a mode selector means in a reproducing position upon re-starting the engine based on the information stored in the memory means.
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Citations
6 Claims
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1. An apparatus for suppressing vibratory or quaky movements of a mobile type crane having a vehicle body and an engine, said apparatus reproducing, following restarting of the engine, a condition existing prior to engine shut off, comprising:
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a boom including a hydraulic cylinder having operatively opposing first and second oil chambers, the boom pivotally supported on the vehicle body through said hydraulic cylinder for pivoting movements about a horizontal axis; a direction control valve for respectively, selectively supplying and draining discharge oil pressure to and from the first load-holding oil chamber and the opposing second oil chamber of said hydraulic cylinder; a counter-balancing valve provided at a position fluidically between said hydraulic cylinder and said direction control valve; an accumulator selectively fluidically connected to said hydraulic cylinder at a position fluidically between said hydraulic cylinder and said counter-balancing valve and comprising means for suppressing vibrations of said vehicle body; a mode selector means selectively switchable between a travel mode position wherein said mode selector means comprises means for communicating said first and second oil chambers with each other through a closed circuit in communication with said accumulator and a working mode position wherein said mode selector means comprises means for opening said closed circuit, supplying oil pressure to and from said first and second oil chambers independently of each other and isolating said accumulator from said hydraulic cylinder; memory means for electronically storing information as to the mode of operation of said mode selector means under engine operating conditions; and a controller comprising means for reproducing automatically after an in-transit engine cut-off the mode of operation in existence before the engine cut-off, by setting said mode selector means in a reproducing position upon re-starting said engine based on information stored in the memory means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification