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US 4,674,231 AGranted
Magnetic door opener
AssigneeReady Metal Manufacturing Company
InventorsJohn R. Radek, Richard Maks, Russell Vestuto
Life of this patent
Estimating the term…
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AssigneeReady Metal Manufacturing Company
InventorsJohn R. Radek, Richard Maks, Russell Vestuto
Estimating the term…
A magnetic door opener device adapted to be positioned below a countertop made of non-magnetic materials, the device having a pair of magnets which attractively interact with a pair of magnets attached to the bottoms of a pair of windows which are suspended on a trolley for movement to or fro to determine closed and opened positions of the window. The device underneath the countertop comprises a pair of spaced toothed sprockets supporting an endless belt having inner and outer runs, the outer run supporting a magnet adapted to magnetically cooperate with a magnet in the bottom of one of the windows, and the other run of the belt supporting a different magnet adapted to attractively cooperate with a magnet in the bottom of the other window. A motor control and limit switches are provided for controlling the opening and closing positions of the windows when a control switch is operated by an operator. The belt has a plurality of apertures which, in conjunction with the teeth on the sprockets, prevent slippage and at the same time provide a means for adjustably positioning the magnets on the endless belt to thereby determine the size of the opening between the opened windows.
A device for controlling operation of a pair of windows suspended by a trolley and adapted to be moved to and fro, above a coutertop comprising a magnetic pad secured to the bottom of each window and positioned above the top surface of the countertop, and magnetic means disposed below said countertop and adapted to coact with said magnetic pads for opening and closing said windows and control means for controlling the actuation of said magnetic means, wherein said magnetic means comprises a longitudinal support member, a sprocket rotatably supported at each end of said support member, and endless belt extending across said sprockets, a plurality of lower magnetic pads supported on said belt, each of said lower magnetic pads being disposed below a respective window magnetic pad, a motor for driving one of said sprockets, and brackets for securing said support member underneath said countertop.
Dependencies are inferred from the claim text.