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US 4,698,876 AGranted
Door apparatus partially supported by a magnetic mechanism
AssigneeShinko Electric Co., Ltd.
InventorMitsuji Karita
Life of this patent
Estimating the term…
Abstract
A door apparatus includes a door movable between a closed position and an open position with respect to a stationary structure, and a support device for supporting the door. The support device includes a magnet mounted on one of the door and the stationary structure, and a member of a magnetic material mounted on the other of the door and the stationary structure. The magnet and said magnetic member cooperates with each other to produce a magnetic force therebetween to support at least part of the weight of the door.
Claims9
A door apparatus comprising:
- a door movable between a closed position and an open position with respect to a stationary structure;
- support means for supporting said door, said support means comprising
- (i) magnet means mounted on one of said door and said stationary structure,
- (ii) a guide mechanism comprising rollers also mounted on the one of said door and said stationary structure, and
- (iii) an elongated guide member of a magnetic material mounted on the other of said door and said stationary structure,
- said magnet means and said magnetic member cooperating with each other to produce a magnetic force therebetween for supporting at least part of the weight of said door, and
- said elongated member also being connected to the guide mechanism for relative movement therebetween with said rollers continuously being in direct rolling contact with said elongated member on two sides thereof to also partially support said door, the elongated member and the guide mechanism cooperating with each other to guide movement of the door between the open and closed positions;
- and
- drive means for moving said door between the closed and open positions, and comprising non-magnetic conductive means mounted on one of said door and said stationary structure, and traveling magnetic field means mounted on the other of said door and said stationary structure for applying a traveling magnetic field to said non-magentic conductive means to impart a propelling force to said door to move it between the closed and open positions.
6 more elements
A door apparatus comprising:
- (a) a door movable between a closed position and an open position with respect to a stationary structure;
- and
- (b) support means for supporting said door, said support means comprising magnet means mounted on one of said door and said stationary structure, and a member of magnetic material mounted on the other of said door and said stationary structure, said magnet means and said magnetic member cooperating with each other to produce a magnetic force therebetween for supporting at least part of the weight of said door;
- wherein said magnet means comprises an electromagnet, there being provided battery means mounted on said door and electrically connected to said electromagnet for exciting it, there being provided charging means for charging said battery means, said charging means comprising a power source, a primary coil mounted on said stationary structure and connected to said power source, and a secondary coil mounted on said door and electrically connected to said battery means, said secondary coil being brought into electromagnetic coupling with said primary coil for charging said battery means when said door is in the closed position.
1 more element
A door apparatus comprising:
- (a) a door movable between a closed position and and open position with respect to a stationary structure;
- and
- (b) support means for supporting said door, said support means comprising magnet means mounted on one of said door and said stationary structure, and a member of a magnetic material mounted on the other of said door and said stationary structure, said magnet means and said magnetic member cooperating with each other to produce a magnetic force therebetween for supporting at least part of the weight of said door;
- wherein said magnet means comprises an electromagnet, there being provided battery means mounted on said door and electrically connected to the electromagnet for exciting it;
- further including charging means for charging the battery means, said charging means comprising:
- a power source, and a secondary coil mounted on the door and electrically connected to the battery means, the secondary coil being selectively brought into coupling with the primary coil for charging the battery means.
3 more elements
Dependencies are inferred from the claim text.