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1. 发明专利

JP2002038534A OPERATION CHANGE-OVER CONTROL CIRCUIT FOR A PLURALITY OF ACTUATORS RETROFITTED IN MULTI-FUNCTIONAL EXCAVATOR 失效
公开(公告)号：JP2002038534A
公开(公告)日：2002-02-06
申请号：JP2000220149
申请日：2000-07-21
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ASAKURA NOBUKATSU
IPC分类号： E02F9/22
摘要： PROBLEM TO BE SOLVED: To provide an operation change-over control circuit which controls a backup selector valve for a plurality of attachments retrofitted in an excavator, according to a pilot pressure system, and correctly controls the retrofitted attachments by a single operating lever without increasing the number of the operating levers, in spite of increased relationships between the operating levers and the selector valve due to employment of the pilot pressure system. SOLUTION: According to the operation change-over control circuit, a main control valve for the actuators retrofitted in the excavator is controlled according to the pilot pressure system, and the selector valve is interposed between the main control valve and the retrofitted actuators. The selector valve is controlled by a solenoid valve, whereby pressure oil fed from the main control valve is fed to the retrofitted actuators by switching connection to the actuators.

2. 发明专利

JPH0966738A OPERATOR CAB VIBRO-ISOLATOR OF CONSTRUCTION MACHINERY 失效
公开(公告)号：JPH0966738A
公开(公告)日：1997-03-11
申请号：JP24391495
申请日：1995-08-30
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ISHII HAJIME
IPC分类号： E04B1/98 , B60J1/00
摘要： PROBLEM TO BE SOLVED: To check any vibration in the windowpane of an operator cab in construction machinery. SOLUTION: Two columns 10, 10 and a part surrounded by a connecting part 11 and a roof 12 are all formed in the sidepiece of an operator cab, serving as a window 13, and transparent window glass 14 is attached to this window 13. Three guarding crosspieces 15a to 15c are set up so as to lay them across the window 13 from side to side and both sides of these crosspieces are set up so as to lay locked to the columns 10 and 10 by screws, whereby holders 16 are connected to each intermediate part of the crosspieces 15b and 15c and, in turn, a rubber block 17 is installed in this holder 16 tight enough. This rubber block 17 is one that brings its damping function to control a vibration in the window glass 14 into full play, therefore when these crosspieces 15b and 15c are attached to the columns 10, the rubber block 17 is forcibly pressed to the window glass 14 and thereby it comes to such a state as being elastically deformed to some extent.

3. 发明专利

JP2003213727A REVOLVING FRAME FOR CONSTRUCTION MACHINE 审中-公开
公开(公告)号：JP2003213727A
公开(公告)日：2003-07-30
申请号：JP2002010238
申请日：2002-01-18
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： MOTOZU MAKOTO , YAMADA KAZUNORI , KUNO MAKOTO , ISHIKAWA NAOHIRO , YOSHIDA HAJIME
IPC分类号： E02F9/08
摘要： PROBLEM TO BE SOLVED: To increase the torsional rigidity or the like of a boom foot section by forming the rear-section side of the boom foot section in a closed sectional structure, and to reduce the weight of the whole revolving frame. SOLUTION: The revolving frame 21 is composed of a center frame 22, a left-side frame 35, a right-side frame 38 or the like. The center frame 22 is constituted of a bottom plate 23, left-right front vertical plates 24 and 24, left-right rear vertical plates 25 and 25, a parting plate 26, a horizontal plate 29, a closing plate 30 or the like. The horizontal plate 29 and the closing plate 30 are extended up to the place of the parting plate 26 in the longitudinal direction between the left-right front vertical plates 24 and 24, and the rear-end side of the closing plate 30 is joined with the upper-section front side of the parting plate 26 by an external welding. A section between the left-right front vertical plates 24 and 24 is formed in the closed sectional structure closing the section between the vertical plates from the upper side extensively over the rear-section side from the front-section side of the boom foot sections 24A by the closing plate 30. COPYRIGHT: (C)2003,JPO

4. 发明专利

JP2002030695A STRUCTURE OF CYLINDRICAL LEVER STAND WITH OPERATION LEVER 失效
公开(公告)号：JP2002030695A
公开(公告)日：2002-01-31
申请号：JP2000216772
申请日：2000-07-18
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ASAKURA NOBUKATSU
IPC分类号： E02F9/20 , E02F3/43 , E02F9/16
摘要： PROBLEM TO BE SOLVED: To provide a cylindrical lever stand with an operation lever accommodating a pilot operated valve for selecting a selector valve for feeding the pressure oil to a hydraulic cylinder for an angle optionally added by the pilot pressure, and installing a cylindrical operation lever stand with the operation lever for operating the valve, at a front right side of a floor surface of the cab of an upper structure. SOLUTION: The pilot operated valve for switching the selector valve for feeding the pressure oil to the hydraulic cylinder for the angle by the pilot pressure is accommodated in the cylindrical operation lever stand having the operation lever mounted at a front right side of the floor surface of the cab of the upper structure of an excavator.

5. 发明专利

JP2002021114A STRUCTURE FOR MOUNTING A HYDRAULIC HOSE ON HYDRAULIC CYLINDER FOR BLADE OPERATION 失效
公开(公告)号：JP2002021114A
公开(公告)日：2002-01-23
申请号：JP2000205999
申请日：2000-07-07
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ASAKURA NOBUKATSU
IPC分类号： E02F9/00 , F15B11/00
摘要： PROBLEM TO BE SOLVED: To provide a structure for mounting a hydraulic hose devised to change only a broken hydraulic hose even when it is broken in the middle of working by dividing the hydraulic hose to a hydraulic hose connecting part of the hydraulic cylinder for blade working from the hydraulic hose connecting part of a selector valve provided on a swivel joint in a revolving round barrel of a lower part travelling body in two pieces. SOLUTION: The hydraulic hoses are respectively installed between the hydraulic hose connecting part of the selector valve and a hydraulic hose connecting part of a hydraulic hose junction holding bracket and between the hydraulic hose connecting part of the hydraulic hose junction holding bracket and the hydraulic hose connecting part of the hydraulic cylinder for blade working by providing the hydraulic hose junction holding bracket on a blade elevating frame at a position equivalent to roughly the middle of the hydraulic hose connecting part of the selector valve provided on the swivel joint in the inside of the revolving round barrel of the lower part travelling body and the hydraulic hose connecting part of the hydraulic cylinder for blade working.

6. 发明专利

JP2002030691A BLADE MOUNTING STRUCTURE 失效
公开(公告)号：JP2002030691A
公开(公告)日：2002-01-31
申请号：JP2000216798
申请日：2000-07-18
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ASAKURA NOBUKATSU
IPC分类号： E02F3/815
摘要： PROBLEM TO BE SOLVED: To prevent the interference of an angle stay member with a crawler belt of a lower structure in maximally operating the angle of a blade. SOLUTION: A mounting position of one end of the length-adjustable angle stay member to a mounting bracket installed to one end of a back face of a blade and the other mounting position of the length-adjustable angle stay to a mounting bracket installed on one side of a blade raising and lowering frame are located in parallel with the crawler belt of the lower structure.

7. 发明专利

JP2002021812A THREE-FACE PROTECTING STRUCTURE OF ALMOST U-SHAPED SECTION OF HYDRAULIC CYLINDER 失效
公开(公告)号：JP2002021812A
公开(公告)日：2002-01-23
申请号：JP2000206032
申请日：2000-07-07
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： YOSHIDA HAJIME , ASAKURA NOBUKATSU
IPC分类号： E02F9/00 , F15B15/14
摘要： PROBLEM TO BE SOLVED: To provide a protecting structure of a hydraulic cylinder rod for angle mounting in a hydraulic cylinder for angle a three-face protecting cover of almost U-shaped section protecting three sides of upward, inward, and downward sides of the hydraulic cylinder for angle, in a multi-functional excavating work machine provided with a bucket and a blade. SOLUTION: A guided member is provided in a side face of an external peripheral surface of a cylinder part of a hydraulic cylinder for angle, a guide plate supporting and guiding the guided member interposed is provided in an inner side face of a side surface plate of a three-face protecting cover of U-shaped section provided in a rod part of the hydraulic cylinder for angle in a multi-functional excavating work machine, a slide guide member is provided in an upper face and a lower face of the external peripheral surface in the cylinder part of the hydraulic cylinder for angle.

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