公开(公告)号：US3544942A

公开(公告)日：1970-12-01

申请号：US3544942D

申请日：1969-05-01

Applicant: DANFOSS AS

Inventor： JOHNSEN INGOLF ,  JENSEN J GAMMELBY

IPC: G05D23/19 ,  G05D23/275 ,  H01H37/44 ,  H01H37/46 ,  H01H61/00

CPC classification number: G05D23/1921 ,  G05D23/275

公开(公告)号：US3559399A

公开(公告)日：1971-02-02

申请号：US3559399D

申请日：1969-04-28

Applicant: DANFOSS AS

Inventor： JOHNSEN INGOLF ,  JENSEN JENS GAMMELBY

IPC: G05D23/275 ,  F01K27/00 ,  F03G7/00

CPC classification number: G05D23/275 ,  G05D23/1921

Abstract: THE INVENTION RELATES TO A SERVOMOTOR ASSEMBLY WITH THE SERVOMOTOR BEING OF THE TYPE HAVING A PISTON WHICH IS DISPLACEABLE BY AN ELECTRICALLY HEATABLE EXPANSION MATERIAL. THE ASSEMBLY INCLUDES VALVE SPINDLE MEANS ALONG WITH LIMIT SWITCHES AND MECHANICAL SPRING MEANS ARRANGED SO THAT WHEN THE SPINDLE MEANS IS STOPPED BY AN ABUTMENT AT THE END OF ITS STROKE, THE PISTON IS ALLOWED TO CONTINUE ITS STROKE A SHORT DISTANCE FURTHER WITHOUT UNDULY RAISING THE PRESSURE OF THE EXPANSION MATERIAL.