Elevator hoistway door bolt lock

US5454447A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Richard E. Kulak · Bristol, US
• Thomas M. McHugh · Farmington, US
• Edward E. Ahigian · Arlington Heights, US
• Jerome F. Jaminet · South Windsor, US
• Thomas He · Unionville, US
• Richard E. Peruggi · Glastonbury, US
• Thomas M. Kowalczyk · Farmington, US
• David W. Barrett · Hartland, US

Key dates

• Filing date: Apr 6, 1994
• Grant date: Oct 3, 1995
• Expiry date: Apr 6, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B13/16
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An elevator hoistway door lock comprises a rod journaled for rotation on a hoistway door. A pin which extends laterally from the rod engages a lip when the rod is rotated into a locked position by means of its own weight, and optionally a spring. The pin clears the lip when the rod is rotated into an unlocked position by means of a retiring cam disposed on the elevator car. The electrical safety switch contacts are interconnected by a rotating contact disposed on the rod, only when the rod is rotated to place the pin in the locked position.