Door opening mechanism
OwnerLaszlo Keszthelyiinventor
Life of this patent
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Abstract
A swinging door operating mechanism includes a hydraulic cylinder having a piston coupled to the door to open the door with the piston advance, opposite ends of the cylinder being connected through a solenoid actuated four way reversing valve to the input and output respectively of an electric motor driven hydraulic pump. A pressure responsive switch is exposed to the hydraulic fluid delivered to the door opening end of the cylinder and is actuated when the pressure exceeds an adjustable value to deenergize the pump motor and switch the advancing end of the cylinder to the pump inlet. The door opening cycle is initiated by the momentary local or remote closing of a start switch. The cylinder piston is connected to the door by a one way advancing linear to rotary motion coupling.
Claims14
A swinging door opening mechanism comprising a door swingable about a vertical axis between an advanced door open position and a retracted closed position, means including a hydraulic motor drive for applying an open torque to said door, means including an electric motor drive pump for delivering a pressurized drive fluid to said hydraulic motor and fluid pressure actuated control means which in response to the pressure of said drive fluid delivered to said hydraulic motor exceeding a predetermined value interrupts the delivery of said pressurized drive fluid to said hydraulic drive motor.
A swinging door opening mechanism comprising a door swingable about a vertical axis between an advanced open position and a retracted closed position, means responsive to an input signal for applying to said door a torque in a door opening direction and fluid pressure actuated control means responsive to said door opening torque exceeding a predetermined value for discontinuing said application of said door opening torque.
Dependencies are inferred from the claim text.