JPS564367A - Metal flask for vacuum casting - Google Patents

Metal flask for vacuum casting

Info

Publication number
JPS564367A
JPS564367A JP7816479A JP7816479A JPS564367A JP S564367 A JPS564367 A JP S564367A JP 7816479 A JP7816479 A JP 7816479A JP 7816479 A JP7816479 A JP 7816479A JP S564367 A JPS564367 A JP S564367A
Authority
JP
Japan
Prior art keywords
vacuum
metal flask
maintained
spring
check valve
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
JP7816479A
Other languages
Japanese (ja)
Inventor
Ryozo Hashida
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7816479A priority Critical patent/JPS564367A/en
Publication of JPS564367A publication Critical patent/JPS564367A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To maintain the degree of vacuum in the metal flask constant by providing a check valve and an auxiliary suction device which makes use of elastic material to the connection part between the metal flask for vacuum casting and a vacuum suction pipe.
CONSTITUTION: Even if there is slight leakage of vacuum after vacuum suction, the specified degree of vacuum is maintained. For example, a check valve 9 and auxiliary suction device 1 are provided to the connection part 3 between a metal flask 2 and flexible hose 8. When air is sucked by a vacuum pump, the valve 13 which is energized to a suction hole 12 by a spring 14 is lifted and the air in the metal flask 2 is increased of speed by passing through vent ports 4, 11 and is exhausted. When the suction is ceased after the molding, the valve 13 is returned by the spring 14 to close the check valve 9, whereby the inside of the metal flask 2 is maintained at the specified degree of vacuum. Even if there is slight vacuum leakage after the hose 10 has been removed, the piston 7 which is held energized inward by a spring 6 in the cylinder 8 of the auxiliary suction device 1 moves so as to take the balance of the pressure in the cylinder 8 and the pressure in the metal flask 2, whereby the original degree of vacuum is maintained.
COPYRIGHT: (C)1981,JPO&Japio
JP7816479A 1979-06-22 1979-06-22 Metal flask for vacuum casting Pending JPS564367A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7816479A JPS564367A (en) 1979-06-22 1979-06-22 Metal flask for vacuum casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7816479A JPS564367A (en) 1979-06-22 1979-06-22 Metal flask for vacuum casting

Publications (1)

Publication Number Publication Date
JPS564367A true JPS564367A (en) 1981-01-17

Family

ID=13654282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7816479A Pending JPS564367A (en) 1979-06-22 1979-06-22 Metal flask for vacuum casting

Country Status (1)

Country Link
JP (1) JPS564367A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138530A (en) * 1981-02-13 1982-08-26 Mitsubishi Electric Corp Electric power source apparatus for machining with electrical discharge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138530A (en) * 1981-02-13 1982-08-26 Mitsubishi Electric Corp Electric power source apparatus for machining with electrical discharge

Similar Documents

Publication Publication Date Title
DE69332089D1 (en) evacuation method
DE3276188D1 (en) Diaphragm pump for a vacuum free of oil
JPS564367A (en) Metal flask for vacuum casting
JPS52100010A (en) Two cycle engine suction device
JPS54129262A (en) Disc brake
JPS5532941A (en) Leakage gas-free compressor
JPS5779279A (en) Pump
JPS51123906A (en) Fluid pressure machine
JPS564366A (en) Metal flask for vacuum casting
JPS5551907A (en) Valve operation stopping mechanism
JPS57164854A (en) Negative pressure source in negative pressure type booster for automobile
JPS5618137A (en) Air suspension device
JPS57195302A (en) Record suction disk
JPS57116178A (en) Sliding device for piston in swash plate type axial piston pump or motor
JPS5638585A (en) Electromagnetic plunger pump
JPS5664189A (en) Device for preventing noise of vacuum pump by water sealing
JPS5664144A (en) Suction device for internal combustion engine
JPS567185A (en) Automatic switch for paper holder of paper counter
JPS5540003A (en) Reduced pressure generating device for reduced pressure molding method
JPS5447112A (en) Compression mechanism
JPS5750240A (en) Method for making mold
JPS5664118A (en) Method and device for filling cooling water of engine
JPS6240127Y2 (en)
JPS555479A (en) Pump
JPS5620868A (en) Seal device for reciprocating machine