Dennis James Farrar

US Patent:

20030070883, Apr 17, 2003

Filed:

Aug 22, 2002

Appl. No.:

10/226996

Inventors:

Michael Foster - Southaven MS, US
Dennis Farrar - Memphis TN, US

International Classification:

B66B001/34

US Classification:

187/394000

Abstract:

The present invention relates to an improved elevator selector system. One embodiment incorporates all of the operational and A17 code required car position sensing functions into a single car mounted enclosure, without any external mechanical roller switches, by incorporating directional limits, normal terminal slow down and emergency terminal speed limiting functions into a tape selector. All operational and sensing functions may be implemented using a standard 3-inch wide tape by disposing of magnetic signalers on the opposite side of the tape from the side used for leveling and floor identification. An alignment tool facilitates placement of magnets. Tape guides permit the selector to run smoothly along the tape. Optical rather than magnetic sensors may be used for quadrature hole counting to detect relative speed and location without interfering with other magnetic functions. All selector components may be tethered to the selector enclosure to prevent accidental loss down the hoistway. Structural foam and heavy internal gussets may be used for the selector enclosure. Alignment pins on the selector enclosure facilitate component installation. Stress distributing nut plates create a strong interface between the selector enclosure and steel mounting bracket.

US Patent:

48321583, May 23, 1989

Filed:

Dec 3, 1987

Appl. No.:

7/129331

Inventors:

Dennis J. Farrar - Memphis TN
Mark H. Duckworth - Memphis TN

Assignee:

Delaware Capital Formation, Inc. - Wilmington DE

International Classification:

B66B 1308

US Classification:

187103

Abstract:

An elevator system has a door operator with a door operator motor and a dedicated microprocessor for storing door open and door close cycles. The microprocessor initiates door open and close cycles responsive to external door open and door close commands. Preferably the microprocessor stores a plurality of door closed cycles in which the elevator controller selects one of the cycles when issuing a door closed command.

US Patent:

47874813, Nov 29, 1988

Filed:

Jan 20, 1987

Appl. No.:

7/005552

Inventors:

Dennis J. Farrar - Memphis TN
William M. Dugan - Memphis TN

Assignee:

Delaware Capital Formation, Inc. - Wilmington DE

International Classification:

B66B 100

US Classification:

187110

Abstract:

A hydraulic elevator system includes a hydraulic jack for raising and lowering the car and a distributed intelligence microprocessor control system, containing a number of subsystems, each having designated control responsibilities. A door operator microprocessor subsystem initiates stored open and close cycles responsive to external commands. A selector microprocessor subsystem determines target floor and distance values, produces slowdown interrupt signals when the car nears a target floor, and produces levelling signals for stopping the car at a landing. A car logic controller includes a microprocessor for issuing run commands to a relay-based power controller, issuing door open and door closed commands to the door operator microprocessor, issuing run signals to the selector microprocessor, and controlling elevator slowdown. A serial communications link is provided among the various microprocessors in the system.

US Patent:

20160376125, Dec 29, 2016

Filed:

Jun 24, 2015

Appl. No.:

14/748600

Inventors:

- Alpharetta GA, US
Dennis Farrar - Memphis TN, US
Scott Lahmers - Dallas GA, US
Phillip Hampton - Cordova TN, US

International Classification:

B66B 5/02
B66B 5/00
B66B 9/00

Abstract:

An elevator system constructed in accordance to one embodiment of the present disclosure includes an elevator car, a counterweight, a sheave assembly, a suspension rope, a compensation rope, a first optical sensor assembly and a controller. The suspension rope has a first suspension end coupled to the elevator car and a second suspension end coupled to the counterweight. The first compensation rope has a first compensation end coupled to the elevator car and a second compensation end coupled to the counterweight. The first optical sensor assembly can have a first optical sensor pair including a first emitter and a first receiver. The first emitter is configured to emit a first beam to be received by the first receiver. The first optical sensor pair is configured to detect interruption of the first beam by the first compensation rope. The controller controls movement of the elevator car based on the detected interruption.