The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2002
Filed:
Feb. 27, 2001
Applicant:
Inventors:
Kouki Yamamoto, Hitachinaka, JP;
Kim Houng Joong, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B 1/314 ;
U.S. Cl.
CPC ...
B66B 1/314 ;
Abstract
A door system, which uses a linear motor, has a door hanger from which a door is movably suspended, an electric motor for generating a thrust to open and close the door, and a link mechanism made of a non-magnetic material for transmitting the thrust generated by the motor to the door. The linear motor has an armature to serve as a mover runner and a stator having magnetism. The armature has at least a magnetic pole of a first polarity having a first opposed part and another magnetic pole of a second polarity having a second opposed part. The stator is held by the second opposed part.