Espagnolette Gear Rack with Adjustable Backset Segments
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Solution Overview
Problem
Existing espagnolette fittings are limited by a fixed backset dimension, making it impossible to use a different drive pinion with varying diameter without affecting the locking position of the actuating element, as the connecting rod fitting covers a different path when actuated.
Innovation Solution
A toothed rack with multiple drive recesses and coupling means allows for adjustable backsets by enabling the drive pinion to engage with the toothed rack instead of the connecting rod, allowing additional toothed racks to be inserted for varying backset lengths, with recesses and projections facilitating easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a different drive pinion with a different diameter is used to change the backset, then the backset can be adjusted, but the connecting rod fitting covers a different path when actuated, causing the locking elements to no longer lock in the same position
Solution Approach 1:
The toothed rack is divided into multiple identical segments that can be coupled together in series. Each segment has the same drive recess configuration, allowing the backset to be adjusted by changing the number of segments while maintaining the same locking position precision for each segment.
Solution Approach 2:
The toothed rack acts as an intermediary between the drive pinion and the connecting rod. By introducing this intermediate component with adjustable length (through varying numbers of coupled segments), the backset can be changed without affecting the locking position precision, as the rack maintains the geometric relationship between the pinion and rod.
2Adaptability or versatility
If the toothed rack is made removable and adjustable, then different backsets can be realized with the same drive pinion, but the device complexity increases
Solution Approach 1:
The toothed rack is segmented into identical modular units that can be coupled together. This segmentation allows the rack to be easily adjusted by adding or removing segments while maintaining a simple, standardized design for each unit, reducing overall device complexity.
Solution Approach 2:
The toothed rack segments are designed with universal coupling means that allow them to be interconnected in various configurations. The same segment design can be used for different backset requirements, eliminating the need for multiple specialized rack designs and simplifying the overall device.
Solution Approach 3:
The toothed rack is designed to be dynamically adjustable rather than fixed. The removable and coupleable segments allow the rack length to be changed based on specific backset requirements, providing flexibility without requiring complex permanent adjustment mechanisms.
3Adaptability or versatility
If multiple toothed racks are inserted to increase backset, then larger backsets can be achieved, but the assembly and disassembly process becomes more complex
Solution Approach 1:
The toothed rack is segmented into standardized modules with matching coupling means. This segmentation allows multiple racks to be quickly assembled or disassembled by simply connecting or disconnecting the modular segments, making the process straightforward even for larger backset configurations.
Solution Approach 2:
The coupling means act as intermediaries between the toothed rack segments, facilitating easy connection and disconnection. These intermediary elements enable smooth assembly and disassembly operations without requiring complex alignment or fastening procedures, even when multiple segments are involved.
Data Source
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AI summary
The rack (22',26') has several drive recesses (24a,24a') for engagement of a drive pinion (18,18'), and coupling recess (36a',36b) on top surface (34,34'). A coupling projection (30a',30b) for coupling of the rack with a drive rod (12') of the drive rod fitting (10') or coupling recess of another rack is formed in bottom surface (32'). Independent claims are included for the following: (1) method for manufacturing rack; and (2) drive rod fitting.