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:
Jan. 13, 2004
Filed:
Oct. 22, 2002
Kouki Yamamoto, Hitachinaka, JP;
Kim Houng Joong, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A door system includes a door support by which a door is movably supported, a linear motor for generating a thrust to open and close the door, a link mechanism made of a non-magnetic material for transmitting the thrust generated by the linear motor to the door. The linear motor an armature, and a part having magnetism. The armature includes a first magnetic pole having a first polarity and a second magnetic pole having a second polarity. The first magnetic pole and the second magnetic pole collectively include a first opposed part which defines a first gap, and a second opposed part which defines a second gap. The part having magnetism is disposed in the first gap and the second gap. The door system may be used in the car of an elevator system.