Window Security Lock Pivotable Stop Nesting
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Solution Overview
Problem
Prior window security locks often jam or break due to weather stripping seals and excessive force, and they fail to prevent unauthorized entry while allowing ventilation, with issues like insect and debris infiltration.
Innovation Solution
A window security lock with a pivotable stop housed in a rectangular structure, driven by a coil spring, featuring chamfered surfaces for structural integrity and a design that prevents accidental operation by using a resilient member and pivot pins to limit window opening, allowing manual operation and secure ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stop is made exposed and accessible for easy operation, then ease of operation is improved, but the lock becomes vulnerable to accidental triggering by weather stripping seals and excessive force
Solution Approach 1:
The stop is nested within the housing structure, with only a portion accessible through an opening. The lip on the stop extends through the opening to provide manual operation while the main body remains protected inside the housing, preventing accidental triggering by weather stripping seals.
2Ease of operation
If the housing opening is made large enough to allow stop operation, then ease of operation is improved, but insect and debris infiltration increases
Solution Approach 1:
The stop is nested within the housing with only a lip portion exposed through the opening. This allows the opening to be small enough to prevent insect and debris infiltration while still providing access for manual operation of the stop.
Solution Approach 2:
The lip on the stop acts as an intermediary element that extends through the housing opening. It provides the necessary interface for manual operation while the main body of the stop remains protected inside, filtering out harmful factors.
3Strength
If the stop is made robust to resist excessive force, then strength is improved, but the lock becomes more complex with additional parts
Solution Approach 1:
The stop is made from a composite structure combining a resilient member (spring) with a rigid body portion. This composite design provides both strength to resist excessive force and flexibility to return to position, while maintaining simplicity with few parts.
Solution Approach 2:
The stop combines multiple functions into a single integrated component: the resilient member provides both the forcing action and the return mechanism, while the body portion provides structural strength. This merging eliminates the need for separate returning mechanisms.
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 solution effectively prevents unauthorized entry by limiting window opening while allowing sufficient ventilation and resisting breakage from force, maintaining structural integrity and preventing debris infiltration.
Implementation Method 1
A resilient member in the form of a coil spring forces the stop outwardly from the housing through an opening located on the housing face
Implementation Method 2
Chamfered surfaces on the stop provide structural integrity to the lock as the chamfered surfaces engage the inner housing walls when the stop is extended in the security mode
Implementation Method 3
A pair of pivot pins located on the stop engage slots within each side of the housing to allow rotation of the stop
Data Source
AI summary
A security lock for a window jamb includes a pivotable stop for use on single hung, double hung and other type windows. The stop is manually operated to limit the window opening to about four inches to prevent unauthorized entry. The stop incorporates a lip which closes the stop opening to thereby prevent dust, debris and insect infiltration.