Door operating mechanism

Claim 2

A door operating mechanism comprising: a reversible electric drive motor and means for operatively connecting the drive motor to a door to effect opening and closing movement of the door at a selected rate when the drive motor is respectively rotated in reverse anD forward directions, a first switch means operable when actuated to energize said drive motor in said reverse direction and a second switch means operable when actuated to energize said drive motor in said forward direction, a unidirectional electric timer motor, rotary cam means driven by said timer motor through an operating cycle at a speed related to said selected rate of door movement and operative during a first portion of the cam cycle to actuate said first switch means to energize the drive motor in said reverse direction and maintain said first switch means actuated for a preselected time interval sufficient to effect opening of the door and then deactuate said first switch means to stop opening movement of the door, the cam means being operative during a second portion of the cam cycle to actuate said second switch means to energize said drive motor in said forward direction and maintain said second switch means energized for said preselected time interval to effect closing of the door and then deactuate said second switch means to stop closing movement of the door, and timer control means including door operating switch means operative when actuated, to energize said timer motor to rotate the cam means.

Claim 3

A door operating mechanism according to claim 1 wherein said timer control means includes a hold switch means operative when actuated to energize said timer motor, said cam means including means operative during said first portion of said operating cycle to actuate said hold switch means to continue energization of the timer motor until said cam means deactuates said first switch means.

Claim 4

A door operating mechanism according to claim 2 including electroresponsive means operated under the control of said door operating switch means for interrupting energization of said drive motor in said forward direction whenever said door operating switch means is deactuated.

Claim 5

A door operating mechanism according to claim 2 wherein said second switch means is mounted for movement into and out of an operative position in the path of travel of said cam means, and means responsive to actuation of said door operating switch means for moving said second switch means to its operative position and responsive to deactuation of said door operating switch means to move the second switch means out of its operative position to thereby interrupt closing movement of the door whenever the door operating switch means is deactuated.

Claim 6

A door operating mechanism according to claim 1 wherein said second switch means is mounted for movement into and out of an operative position in the path of travel of said cam means, and means responsive to actuation of said door operating switch means for moving said second switch means to its operative position and responsive to deactuation of said door operating switch means to move the second switch means out of its operative position to thereby interrupt closing movement of the door whenever the door operating switch means is deactuated.

Claim 7

A door operating mechanism according to claim 1 including lamp control switch means operated by said cam means for energizing a lamp when the door is open.

Claim 8

A door operating mechanism comprising: a reversible electric drive motor and means for operatively connecting the drive motor to a door to effect opening and closing movement of the door at a selected rate when the motor is respectively rotated in reverse and forward directions, a rotary cam having a cam portion along its periphery, a first switch means having an actuator positioned at a first location in the path of travel of said cam portion and operative when actuated by the cam portion to energize the drive motor in said reverse direction, a second switch means having an actuator positioned at a second location in the path of travel of the cam portion and operative when actuated to energize said drive motor in said forward direction, said second location being approximately 180* with respect to said cam means from said first location Whereby said cam means actuates said first and second switch means during alternate half revolutions of said cam means and said cam portion having an arcuate extent sufficiently less than 180* to provide a delay interval between actuations of said first and second switch means, a unidirectional electric timer motor operable when energized to rotate said cam means at a speed related to said preselected rate of door movement such that said cam portion actuates said first and second switches for a time interval sufficient to effect opening and closing movement of a door, and timer control means including door operating switch means operative when actuated to energize the timer motor to rotate said cam means.

Claim 9

A door operating mechanism comprising: a reversible electric drive motor and means for operatively connecting the drive motor to a door to effect opening and closing movement of the door at a selected rate when the motor is respectively rotated in reverse and forward directions, a rotary cam having a cam portion along its periphery, a first switch means having an actuator positioned at a first location in the path of travel of said cam portion and operative when actuated by the cam portion to energize the drive motor in said reverse direction, a second switch means having an actuator positioned at a second location in the path of travel of the cam portion and operative when actuated to energize said drive motor in said forward direction, said second location being approximately 180* with respect to said cam means from said first location Whereby said cam means actuates said first and second switch means during alternate half revolutions of said cam means and said cam portion having an arcuate extent sufficiently less than 180* to provide a delay interval between actuations of said first and second switch means, a unidirectional electric timer motor operable when energized to rotate said cam means at a speed related to said preselected rate of door movement such that said cam portion actuates said first and second switches for a time interval sufficient to effect opening and closing movement of a door, and timer control means including door operating switch means operative when actuated to energize the timer motor to rotate said cam means.

Claim 10

A door operating mechanism according to claim 7 wherein said timer control means includes a hold switch means operative when actuated to energize said timer motor, said cam means including means for actuating said hold switch means while said cam portion engages the actuator of the first switch means to maintain the timer motor energized until said cam portion deactuates said first switch means.

Claim 11

A door operating mechanism according to claim 7 including electroresponsive means operated by said door operating switch means for interrupting energization of said drive motor in said forward direction whenever said door operating switch means is deactuated.

Claim 12

A door operating mechanism according to claim 8 wherein said second switch means is mounted for movement into and out of an operative position in the path of travel of said cam means, and means responsive to actuation of said door operating switch means for moving said second switch means to its operative position and responsive to deactuation of said door operating switch means to move the second switch means out of its operative position to thereby interrupt closing movement of the door whenever the door operating switch means is deactuated.

Claim 13

A door operating mechanism according to claim 7 wherein said second switch means is mounted for movement into and out of an operative position in the path of travel of said cam means, and means responsive to actuation of said door operating switch means for moving said second switch means to its operative position and responsive to deactuation of said door operating switch means to move the second switch means out of its operative position to thereby interrupt closing movement of the door whenever the door operating switch means is deactuated.

Claim 14

A door operating mechanism according to claim 7 wherein said drive motor comprises a permanent-split-capacitor type motor having first and second motor windings and a motor capacitor connected to one end of each winding, said first and second switch means comprising first and second normally open single-pole switches respectively connected in series with said first and second motor windings and a source of power.

Claim 15

A door operating mechanism according to claim 7 including lamp control switch means having an actuator positioned in the path of travel of said cam means at a third location intermediate said first and second locations to be actuated when said cam means is stopped with the door in its open position.