Surface Vertical Rod Exit Device Concealed Drive Mechanism
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Solution Overview
Problem
Concealed vertical rod exit devices are difficult to install, replace, and service, requiring removal of door panels and being labor-intensive, while surface vertical rod devices are obtrusive and vulnerable to vandalism.
Innovation Solution
A surface vertical rod exit device with elongated housings mounted to the exterior door panel, concealing the rods and preventing direct access, featuring an actuator operatively coupled to upper and lower latches through drives with housings and rods that transmit actuation force, and a cover to enclose the rod for aesthetic appeal and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concealed vertical rod exit devices are used, then security and aesthetic appeal are improved, but installation and servicing become difficult and labor-intensive
Solution Approach 1:
The exit device is divided into separate modular components: latches, drives, actuators, and housings. Each component can be independently installed, serviced, or replaced without requiring complete disassembly of the entire system or removal of door panels, thus maintaining security while improving ease of maintenance.
Solution Approach 2:
The rod transmission mechanism is extracted from the concealed interior and repositioned to operate on the exterior surface of the door within protective housings. This extraction allows technicians direct access to the mechanism for easy servicing while the housing provides concealment and security when not in use.
2Ease of operation
If surface vertical rod devices are used, then installation and servicing become easier, but the devices become obtrusive and vulnerable to vandalism
Solution Approach 1:
The rod and drive mechanism are nested within protective housings that are mounted to the door surface. The housing encloses the functional components, providing physical protection against vandalism while allowing the mechanism to operate on the surface for ease of access during installation and servicing.
Solution Approach 2:
The housing acts as an intermediary structure between the rod mechanism and the external environment. It provides a protective barrier that prevents direct access to the mechanism for potential vandals, while still allowing controlled access for authorized installation and maintenance activities.
3Ease of operation
If surface vertical rod devices are used, then installation becomes easier, but aesthetic appeal deteriorates
Solution Approach 1:
The functional rod and drive components are nested within aesthetically designed housings that are mounted to the door surface. The housing conceals the mechanical elements while providing a clean, finished appearance that maintains aesthetic appeal despite the surface-mounted configuration that facilitates easy installation.
Data Source
AI summary
A door exit device may include an actuator, an upper latch, and a lower latch. The actuator may be operatively coupled to the upper latch by a first drive and to the lower latch by a second drive. Each drive may include a housing which is mountable to the exterior of a door panel and a drive rod slidably supported within the housing. The housing may include a base which is mountable to the door panel and a cover attachable to the base with the drive rod located between the base and the cover. The housing may be configured to extend from the actuator to the latch to conceal the entire length of the rod between the actuator and the latch.