The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2020
Filed:
Dec. 16, 2016
Otis Elevator Company, Farmington, CT (US);
Kevin Shepherd, Florence, SC (US);
James O'Neal Creel, Jr., Hemingway, SC (US);
OTIS ELEVATOR COMPANY, Farmington, CT (US);
Abstract
An illustrative example hydraulic elevator system includes an elevator car, a hydraulic plunger associated with the elevator car, a fluid reservoir and a conduit coupling the fluid reservoir and the hydraulic plunger. A pump causes fluid movement through the conduit between the fluid reservoir and the hydraulic plunger to cause selective movement of the elevator car. A shutoff valve is associated with the conduit, the shutoff valve being between the pump and the hydraulic plunger. The shutoff valve has a closed position in which the shutoff valve prevents fluid movement between the hydraulic plunger and at least one of the reservoir and the pump to prevent movement of the elevator car. The shutoff valve has an open position in which the shutoff valve permits fluid movement between the pump and the hydraulic plunger to permit movement of the elevator car. A valve actuator operates based on pressure in at least the hydraulic plunger. The valve actuator selectively causes the shutoff valve to be in the open position or the closed position.