Automatic door operator

• US 6,108,975 A
• Filed: 05/28/1999
• Issued: 08/29/2000
• Est. Priority Date: 05/28/1998
• Status: Expired due to Fees

• Current Assignee: Schlage Lock Company LLC (Allegion PLC)
• Original Assignee: NT Dor-O-Matic Incorporated
• Inventors: Bailey, Kevin L.
• Primary Examiner(s): REDMAN, JERRY E
• Application Number:
  US09/322,275
• Time in Patent Office: 459 Days
• Field of Search: 49/339, 49/340, 49/341, 49/333, 49/334, 49/335, 49/336, 74/89.14
• US Class Current: 49/334
• CPC Class Codes: E05F 1/105 with a compression spring
• CPC Class Codes: E05F 15/614 operated by meshing gear wheels, one of which being mounted at the wing pivot axis; operated by a motor acting directly on the wing pivot axis
• CPC Class Codes: E05F 15/63 operated by swinging arms
• CPC Class Codes: E05F 3/102 with rack-and-pinion transmission between driving shaft and piston within the closer housing
• CPC Class Codes: E05F 3/224 for assisting in opening the wing
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/25 Force or torque adjustment therefore E05Y2400/21 takes precedence
• CPC Class Codes: E05Y 2201/41 for closing
• CPC Class Codes: E05Y 2201/422 for opening
• CPC Class Codes: E05Y 2201/434 Electromotors; Details thereof
• CPC Class Codes: E05Y 2201/646 continuous, e.g. closed loops
• CPC Class Codes: E05Y 2201/656 Chains
• CPC Class Codes: E05Y 2201/668 Pulleys; Wheels
• CPC Class Codes: E05Y 2201/672 Tensioners, tension sensors
• CPC Class Codes: E05Y 2400/302 during electromotoric braking
• CPC Class Codes: E05Y 2600/324 around a vertical axis
• CPC Class Codes: E05Y 2800/113 Power assistance
• CPC Class Codes: E05Y 2900/132 Doors
• CPC Class Codes: Y10T 74/18792 including worm

Abstract

An automatic door operator for swing doors which uses a worm gear transmission to connect the motor to a belt and pulley which in turn is connected to a spur gear and drive gear. The door arm of the swing door is connected to a double-ended shaft which is part of the drive gear. A rack and pinion gear and spring are used to provide the closing force to the door arm. The motor is mounted over the spring and the belt and pulleys are located alongside the motor which results in a compact non-handed design.

Claims

1. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor; and

a gear assembly, the pivotable door arm being attached to the gear assembly, the gear assembly comprising a worm gear transmission connected to the motor;

a pulley and belt drive connected to the transmission; and

a spur sear assembly driven by the belt, the pivotable door arm being attached to the spur gear assembly, the pulley and belt drive being positioned alongside the motor and the motor being positioned between the transmission and the sour gear assembly.

2. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor;

a gear assembly, the pivotable door arm being attached to the gear assembly, the gear assembly comprising a worm gear transmission connected to the motor;

a rack and pinion gear connected to the gear assembly, the rack being moveable between an open position and a closed position; and

a compression spring biasing the rack to the closed position.

3. The door operator according to claim 2, wherein the motor is positioned adjacent and above the compression spring.

4. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor;

a gear assembly, the pivotable door arm being attached to the gear assembly, the sear assembly comprising a worm gear transmission connected to the motor;

a housing, the motor and gear assembly being positioned proximate a first end of the housing; and

an electronics control module being positioned adjacent the motor and gear assembly and being positioned proximate end of the housing, the pivotable door arm attachment to the gear assembly being positioned equidistant from the first and second ends of the housing.

5. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor;

a gear assembly comprising a pulley and belt drive connected by a right angle transmission to the motor; and

a spur gear assembly driven by the belt, the pivotable door arm being attached to the spur gear assembly, the pulley and belt drive being positioned alongside the motors;

a rack and pinion gear connected to the sear assembly, the rack being movable between an open position and a closed position; and

a compression spring biasing the rack to the closed position, the motor being positioned adjacent and above the compression spring.

6. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor;

a gear assembly comprising a worm gear transmission connected to the motor;

a pulley and belt drive connected to the transmission;

a spur gear assembly driven by the belt, the pivotable door arm being attached to the spur gear assembly;

a rack and pinion gear connected to the gear assembly, the rack being moveable between an open position and a closed position; and

a compression spring biasing the rack to the closed position,

the pulley and belt drive being positioned alongside the motor, the motor being positioned between the transmission and the spur gear assembly and the motor being positioned adjacent and above the compression spring.

7. The door operator according to claim 6, further comprising:

a housing, the motor and gear assembly being positioned proximate a first end of the housing; and

an electronics control module positioned adjacent the motor and gear assembly and being positioned proximate a second end of the housing, the attachment of the pivotable door arm being positioned equidistant from the first and second ends of the housing.

8. A door operator for a swing door, the door operator comprising:

a pivotable door arm adapted to be attached to the swing door;

a motor;

a gear assembly comprising a worm gear transmission connected to the motor;

a pulley and belt drive connected to the transmission;

a spur gear assembly driven by the belt, the pivotable door arm being attached to the spur gear assembly;

a rack and pinion gear connected to the gear assembly, the rack being moveable between an open position and a closed position;

a compression spring biasing the rack to the closed position;

a housing, the motor and gear assembly being positioned proximate a first end of the housing; and

an electronics control module positioned adjacent the motor and gear assembly and being positioned proximate a second end of the housing,

the pivotable door arm attachment to the spur gear assembly being positioned equidistant from the first and second ends of the housing, the pulley and drive belt being positioned alongside the motor, the motor being positioned between the transmission and the spur gear assembly and the motor being positioned adjacent and above the compression spring.