Lock Grub Screw Adjustment for Door Clearance
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Solution Overview
Problem
Conventional locker and cabinet locks face issues with varying door thicknesses, leading to clearance problems, damage from fitting screws, aesthetic concerns due to screw protrusion, and reliability issues with pressure-based fastening systems.
Innovation Solution
A lock system featuring a lock block, support, and adjustable chocks and grub screws that match the clearance between the door and support, distributing stress uniformly to prevent damage and ensure secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fitting screws are used to fasten the lock block to the support, then the lock can be secured to the door, but the screws may damage the inside surface of the door
Solution Approach 1:
The patent introduces grub screws that act as intermediary elements between the fastening system and the door. These grub screws are screwed into the support structure and project outward to contact the lock block, providing the necessary fastening force without the fitting screws directly contacting or damaging the door surface. The grub screws mediate the mechanical interaction, transferring the fastening function away from the door surface.
2Adaptability or versatility
If fitting screws are used to cover multiple door thicknesses, then the lock can be installed on doors of varying thickness, but the screws project from the support creating aesthetic problems
Solution Approach 1:
The patent extracts the protruding fitting screws from the support structure and replaces them with grub screws that are embedded within the support. The grub screws project only as much as needed to contact the lock block, eliminating the excessive projection that causes aesthetic problems. This extraction removes the harmful visual element while preserving the functional capability of accommodating various door thicknesses through the adjustable grub screw projection.
3Reliability
If fitting screws exert pressure to secure the lock block, then the locking function is achieved, but the support may bend due to the combined pressure and clearance
Solution Approach 1:
The grub screws serve as intermediary fastening elements that distribute the clamping pressure more evenly. By being screwed into the support structure rather than pressing against it, they transfer the fastening load through the support's structural bore rather than concentrating stress on the support surface. This intermediary mechanism maintains the locking function while preserving the support's structural integrity.
4Object-affected harmful factors
If manual assembly is used to carefully position fitting screws, then door damage is prevented, but automatic machinery cannot be used reducing productivity
Solution Approach 1:
The grub screws are designed to be self-positioning elements that are screwed into predetermined locations in the support structure. This self-service design eliminates the need for careful manual positioning and adjustment, allowing the fastening system to be automatically assembled using machinery. The grub screws automatically engage with the lock block and provide the necessary fastening force without requiring operator intervention for positioning.
Data Source
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AI summary
The invention relates to a lock with an improved locking system, comprising a lock block (2) attached to a support (3) by means of at least two fastening screws (5), with a door (1) arranged between the lock block (2) and the support (3), the lock comprising grub screws (6) screwed into the support (3), which project from the support (3) by a length (L) according to the portion of grub screw (6) screwed into the support (3), such that the length (L) matches a clearance (H) between the door (1) and the support (3). Additionally, the lock can comprise at least one chock (4) of a certain thickness (E) arranged between the lock block (2) and the support (3), such that the thickness (E) of the at least one chock (4) and the length (L) of the grub screws (6) match a clearance (H) between the door (1) and the support (3).