Adjustable Door Lockset Jig for Precise Backset Boring
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Solution Overview
Problem
Current lockset jigs for doors require multiple jigs for different backset options and can be damaged by hole saws, leading to inefficiencies and inconsistencies in hole placement.
Innovation Solution
A cutting guide apparatus with adjustable legs and a spacing element that includes a handle hole guide structure and an edge bore guide structure, featuring an undercut portion to prevent damage and accommodate various backset settings, along with an arbor relief area to accommodate larger hole saw arbors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard jig is used for cutting bore holes, then hole placement consistency is improved, but the jig can be damaged by hole saws at the edges of the bore hole
Solution Approach 1:
The jig is segmented into multiple components including a body, legs, and spacing elements that can be separated or adjusted. This segmentation allows the cutting surfaces to be positioned away from the main jig body, preventing damage to the primary structure while maintaining precise hole placement capability.
Solution Approach 2:
The patent introduces intermediary cutting surfaces or guide structures that act as mediators between the hole saw and the main jig body. These intermediary elements absorb the impact and wear from hole saw cutting, protecting the primary jig components while maintaining manufacturing precision.
2Manufacturing precision
If different jigs are used for different backset options (2 and 3/8 inches or 2 and 3/4 inches), then precise backset spacing is improved, but device complexity and the number of required jigs increases
Solution Approach 1:
The jig is designed with universal features including adjustable spacing elements and interchangeable components that allow a single jig to accommodate multiple backset options (2 and 3/8 inches, 2 and 3/4 inches, and other configurations). This multi-functionality eliminates the need for multiple specialized jigs while maintaining precise backset spacing.
Solution Approach 2:
The jig incorporates dynamic and adjustable elements such as movable legs, adjustable spacing mechanisms, and reconfigurable components that can be modified to accommodate different backset requirements. This dynamic design allows the same jig structure to adapt to various spacing needs without requiring separate fixed jigs for each backset option.
3Manufacturing precision
If the handle hole guide structure is positioned precisely for accurate cutting, then manufacturing precision is improved, but the structure becomes more vulnerable to damage from hole saws
Solution Approach 1:
The handle hole guide structure is segmented into separate cutting surfaces positioned away from the main jig body. This segmentation allows the guide to maintain precise positioning for accurate cutting while isolating the critical components from direct contact with hole saws, reducing vulnerability to damage.
Solution Approach 2:
The jig is designed with preliminary protective features such as recessed cutting surfaces, guard structures, or sacrificial elements that are positioned to intercept hole saw contact before it can reach the main guide structures. This preliminary protection preserves the integrity of precision components.
Data Source
AI summary
A cutting guide apparatus for guiding placement of bore holes in a door may include a first leg configured to be disposed along a first face of the door, a second leg configured to be disposed along a second face of the door opposite the first face, and a spacing element disposed between the first and second legs. At least one of the first leg or the second leg may include a handle hole guide structure and the spacing element may include an edge bore guide structure. A first portion of the handle hole guide structure that is proximate to the first or second face of the door may be undercut relative to a second portion of the handle hole guide structure that is opposite the first portion.