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US 4,952,080 AGranted
Automatic assist for swing-door operator
AssigneeThe Stanley Works
InventorsLeon Boiucaner, James J. Scott
Life of this patent
Estimating the term…
Abstract
A manual power assist control employs a magnetic encoder which is mounted to a shaft of the door operator. The encoder generates pulse trains which are indicative of an attempt to open the door in a given direction. The pulses are processed to generate a signal for opening the doors in the event a manual attempt to open the doors is detected.
Claims20
A manually activatable assist control for an automatic door operator comprising:
- drive means comprising at least one rotatable shaft employable for moving a door;
- encoder means rotatably coupled to a said shaft for generating a train of pulses in response to rotary motion of said shaft;
- direction selector means for selecting a pulse train of a predetermined rotatable direction;
- pulse shaper means for translating said directional pulse train to shape a wave form having pulses of pre-established width;
- integrator means for generating a DC signal having a DC wave form which is a function of the widths of said shaped wave form pulses;
- reference means for establishing a reference signal in response to the number of encoder pulses generated for a pre-established time interval;
- comparator means for comparing said DC signal to said reference signal and generating a power assist signal in the event said DC signal voltage exceeds said reference signal voltage;
- timer means responsive to said power assist signal for generating a hold open output signal for a pre-established time duration;
- output signal means responsive to said hold open output signal for transmitting an opening signal;
- and
- door control means for automatically controlling the drive means for opening and closing the door, said control means comprising an opening input means for triggering the door to an opening mode, said opening input means being responsive to said opening signal.
8 more elements
A manually activatable power assist control for an automatic door operator comprising:
- drive means comprising at least one rotatable shaft employable for moving a door;
- encoder means rotatably coupled to a said shaft for generating a train of pulses in response to rotary motion of said shaft;
- pulse shaper means for translating said pulse train to a shaped wave form having pulses of pre-established width;
- processor means responsive to said train of pulses for generating an integrated signal;
- reference means for establishing a reference signal in response to the number of encoder pulses generated for a pre-established time interval;
- comparator means for comparing said integrated signal to said reference signal and generating a power assist signal and a hysteresis signal to said reference means in the event said integrated wave form voltage exceeds said reference signal voltage;
- timer means responsive to said power assist signal for generating a hold open output signal for a pre-established time duration;
- output signal means responsive to said hold open output signal for transmitting an opening signal;
- and
- door control means for automatically controlling the drive means, said door control means comprising an opening input means for triggering the door to an opening mode, said opening input means being responsive to said opening signal so that said drive means is placed in an opening mode in response to application of a pre-established force against the said door.
7 more elements
A manually activatable power assisted automatic operator comprising:
- drive means comprising at least one rotatable shaft employable for moving a door;
- encoder means rotatably coupled to a said shaft for generating a train of pulses in response to rotary motion of said shaft;
- direction selector means for selecting a pulse train of a predetermined rotatable direction;
- pulse shaper means for translating said directional pulse train to a shaped wave form having pulses of pre-established width;
- integrator means for generating an integrated signal having an integrated wave form which is a function of the widths of said shaped wave form pulses;
- reference means for establishing a reference signal in response to the number of encoder pulses received for a pre-established time interval;
- comparator means for comparing said integrated wave form to said reference signal and generating a power assist signal in response to said comparison;
- timer means responsive to said power assist signal for generating a hold open output signal for a pre-established time duration;
- output signal means responsive to said hold open output signal for transmitting an opening signal;
- and
- door control means responsive to said opening signal for triggering said rive means to an opening mode in response to application of a pre-established force against said door.
8 more elements
Dependencies are inferred from the claim text.