Deadbolt Ridge Geometry for Low-Friction Side-Load Operation
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Solution Overview
Problem
Existing deadbolts experience increased frictional forces due to side loads, which can hinder their movability and prevent them from retracting or extending, especially under high side forces such as those from wind, non-vertical orientations, manual forces, or door operators, leading to potential lock failure.
Innovation Solution
A deadbolt design featuring first and second ridges for low-friction sliding against the lock device opening sides and inclined sections for engaging the strike opening without contacting its sides, allowing smooth movement even when not centered, eliminating the need for rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the deadbolt is designed with traditional flat surfaces for sliding, then the structure is simple, but frictional forces increase substantially under side loads, deteriorating movability
Solution Approach 1:
The deadbolt incorporates ridges with specific geometric profiles at the contact surfaces with the lock device opening, creating localized friction-reducing features. These ridges have optimized shapes that minimize contact area and friction while maintaining structural integrity and guiding the deadbolt movement.
Solution Approach 2:
The invention changes the geometric parameters of the contact surfaces by introducing inclined sections and ridges with specific angles and profiles. This modifies the friction characteristics and force distribution during deadbolt movement, enabling smooth operation under side loads.
2Ease of operation
If the deadbolt contacts sides of both lock device opening and strike opening, then alignment is easier, but friction increases and movement is hindered
Solution Approach 1:
The deadbolt is segmented into distinct functional zones: ridges for contacting the lock device opening sides and inclined sections for engaging the strike opening. This segmentation allows each zone to perform its specific function with optimized geometry, reducing overall friction while maintaining alignment guidance.
Solution Approach 2:
The ridges act as intermediary elements between the deadbolt and the lock device opening, providing a specialized contact interface that reduces friction. The inclined sections then mediate the engagement with the strike opening, separating the functions of alignment and force application.
3Ease of operation
If rollers are added to reduce friction, then movability improves, but device complexity and cost increase
Solution Approach 1:
The deadbolt structure itself provides the friction-reducing function through its own geometric features (ridges and inclined sections) rather than requiring separate rolling elements. The ridges are integral to the deadbolt body and automatically provide low-friction contact surfaces during movement.
Solution Approach 2:
The invention replaces the mechanical rolling contact system (rollers) with a sliding contact system optimized through geometric design. The ridges and inclined sections create a sliding interface with reduced friction coefficients, eliminating the need for complex rolling mechanisms while achieving similar or better performance.
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
The design provides low friction movement, maintaining compactness and cost efficiency while ensuring stable operation under high side forces, reducing frictional resistance and enhancing the deadbolt's movability.
Implementation Method 1
a first ridge for frictionally sliding against a first lock device opening side of the lock device opening, the first ridge protruding from the first base side and being parallel with the actuating direction; a second ridge for frictionally sliding against a second lock device opening side of the lock device opening
Implementation Method 2
at least one first inclined section for frictionally sliding against a first strike opening side of the strike opening, the at least one first inclined section protruding from the first base side separately from the first ridge, and being inclined towards the end; and at least one second inclined section for frictionally sliding against a second strike opening side of the strike opening
Data Source
AI summary
A deadbolt comprising a base body; a first ridge for frictionally sliding against a first lock device opening side, the first ridge protruding from a first base side and being parallel with an actuating direction; a second ridge for frictionally sliding against a second lock device opening side, the second ridge protruding from a second base side and being parallel with the actuating direction; at least one first inclined section for frictionally sliding against a first strike opening side, the at least one first inclined section protruding from the first base side separately from the first ridge, and being inclined towards an end; and at least one second inclined section for frictionally sliding against a second strike opening side, the at least one second inclined section protruding from the second base side separately from the second ridge, and being inclined towards the end.