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Automatic door operator

  • US 4,045,914 A
  • Filed: 09/08/1975
  • Issued: 09/06/1977
  • Est. Priority Date: 09/08/1975
  • Status: Expired due to Term
First Claim
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1. A door operator for utilization with swing-mounted doors comprising a prime mover, a door driving shaft, means connecting said door driving shaft to the door to be operated thereby, means mounting said door driving shaft for rotation about its vertical axis, a drive shaft operatably engaged to said prime mover and having its longitudinal axis perpendicular to the axis of said door driving shaft, and transmission means connecting said prime mover drive shaft and said door driving shaft for operation of the latter into door opening condition pursuant to the power of the prime mover, said transmission means comprising an input shaft axially aligned with said drive shaft and operatably engaged thereto, a first driving gear carried on said input shaft, a first driven gear meshing with said first driving gear, a first shaft axially parallel to said input shaft, an over-riding clutch coupling said first driven gear and said first shaft, a second driving gear engaged upon said first shaft between the over-riding clutch and the end of said first shaft remote therefrom, a bevel pinion shaft axially aligned with said first shaft, means engaging said first shaft and said bevel pinion shaft in coaxial relationship, a second shaft axially parallel with said first shaft, a second driven gear carried on said second shaft between its ends and meshing with said second driving gear, a third driving gear carried on one end of said second shaft spacedly from said second driven gear, a third driven gear mounted on said bevel pinion shaft and meshing with said third driving gear, and cooperating bevel gear means operatively interconnecting said door driving shaft and said bevel pinion shaft at the end of the latter remote from said first shaft.

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