Adjustable Draw Member for Panic Exit Door Lock
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Solution Overview
Problem
The existing adjustable driving mechanisms for panic exit door locks often require troublesome reinstallation due to spacing issues between the draw member and retractor, leading to inefficient and force-intensive unlatching operations.
Innovation Solution
The mechanism includes a bracket with pivotably connected engaging members, a draw member with pivotal holes, and an adjusting member with a threaded shank, allowing for the adjustment of the draw member's position relative to the retractor via a linking rod and follower system, ensuring proper alignment and reducing idle travel, thus enabling smooth and force-saving unlatching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the draw member is fixed at a specific position relative to the retractor, then the installation is simple, but the latch bolt cannot be fully retracted when spacing exists between the draw member and retractor
Solution Approach 1:
The draw member is made adjustable in position relative to the retractor through a modification mechanism involving a slot and pin arrangement. This allows the draw member to be dynamically positioned to eliminate idle travel and ensure proper engagement with the retractor, resolving the contradiction between simple installation and reliable retraction.
2Device complexity
If the first end of the draw member is fixed to the bracket, then the structure is simple, but large force is required to press the operative member for unlatching
Solution Approach 1:
The first end of the draw member is made movable relative to the bracket through the slot and pin mechanism. This dynamic connection allows the draw member to pivot and adjust during operation, creating mechanical advantage that reduces the force required to unlatch the latch bolt while maintaining structural simplicity.
3Volume of moving object
If the spacing between the pivot point and force applying point is small, then the mechanism is compact, but the operation is force-intensive and not smooth
Solution Approach 1:
The movable connection at the first end of the draw member allows dynamic adjustment of the pivot point position during operation. This enables the mechanism to optimize its leverage arm lengths in real-time, providing smooth operation with reduced force requirements while maintaining compact dimensions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design eliminates the need for reinstallation by allowing precise adjustment of the draw member's position, ensuring the latch bolt can be fully retracted with minimal effort, enhancing operational smoothness and convenience.
Implementation Method 1
An adjusting member is rotatable to move the follower and the first pin relative to the engaging member along the second axis and to move the pin along the slots of the engaging member, adjusting a position of the second end of the draw member relative to the retractor along the second axis.
Implementation Method 2
A first pin slideably extends through the slots of the engaging member along the second axis and extends through the pin hole of the draw member.
Implementation Method 3
A second pin extends through the pivotal hole of the draw member and the through-hole of the linking rod such that movement of the linking rod in an unlatching direction causes pivotal movement of the draw member about a second pivot axis defined by the first pin.
Data Source
AI summary
A door lock includes a bracket fixed to a door. An engaging member is pivotably mounted to the bracket. A draw member includes a first end pivotably connected to the engaging member and a second end operably connected to a retractor. A linking rod is connected between the draw member and an operative member mounted to the door such that operation of the operative member causes movement of the linking rod and pivotal movement of the draw member, which in turn, urges the retractor to move a latch bolt from an extended position to a retracted position. A follower is coupled to the first end of draw member to move therewith. An adjusting member is in threading connection with the follower and rotatable to move the follower relative to the engaging member to adjust a position of the second end of the draw member relative to the retractor.