Cremone Bolt Automatic Closing Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cremone bolts for vehicle doors require user intervention for closing, which can be inconvenient, especially in vehicles like vans used for frequent loading and unloading, and may experience incomplete closure due to deformability of the door wing, leading to missed snapping of bolts.
Innovation Solution
A cremone bolt system incorporating at least one rod and a control connected to a movable receding element with elastic return means, allowing the rod to automatically return to a closed position after door closure, ensuring secure locking without user action for opening, and featuring a catch with a cavity for complete closure accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a snapping bolt system is used for door closure, then automatic closing is achieved without user intervention, but incomplete closure may occur due to door wing deformability leading to missed snapping
Solution Approach 1:
The bolt is designed with dynamic characteristics including a snapping action that transitions from a first position to a second position. The system incorporates a return spring that actively pushes the bolt to the closed position, creating a dynamic closing mechanism rather than a static one. This dynamic approach ensures the bolt snaps into proper engagement even when door alignment is imperfect.
Solution Approach 2:
The invention changes the operational parameters of the bolt by introducing a controlled snapping motion with specific force characteristics. The return spring provides a force parameter that actively drives the bolt to the closed position, overcoming variations in door alignment. The system transitions the bolt between distinct positional states (open and closed) with defined force thresholds, ensuring reliable engagement.
2Strength
If a cremone bolt with rigid rods is used, then robustness and alignment correction are achieved, but user intervention is required for closing operation
Solution Approach 1:
The bolt system is designed to be self-servicing through the return spring mechanism that automatically pushes the bolt to the closed position without requiring user intervention. The system serves itself by using the spring's stored energy to perform the closing action, eliminating the need for manual operation while maintaining the robustness of the cremone bolt design.
3Ease of operation
If sliding bolts with return springs are used, then automatic return to closed position is achieved, but the bolts may not snap completely closed due to door deformability
Solution Approach 1:
The bolt incorporates a snapping mechanism that transitions dynamically between open and closed positions rather than sliding gradually. This dynamic snapping action, driven by the return spring, ensures precise closure engagement by overcoming minor misalignments caused by door deformability. The system uses force thresholds to ensure complete engagement rather than relying on gradual sliding.
Solution Approach 2:
The system changes the closure parameter from gradual sliding to a discrete snapping transition. The return spring provides a force parameter that ensures the bolt reaches the fully closed position by overcoming friction and misalignment forces. This parameter change from continuous sliding to discrete snapping improves closure precision and reliability.
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 provides a secure and convenient cremone bolt system that automatically returns to a closed position after door closure, preventing accidental opening and ensuring complete closure without user intervention, addressing the inconvenience and incomplete closure issues of traditional systems.
Implementation Method 1
a receding element (3, 3'), adapted to assume a normal position and a retracted one and to be pushed into the normal position by elastic means
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A cremone bolt comprising: at least one rod (17,17') and a control (10) adapted to be applied to a door wing (16), said control being connected to said rod and adapted to displace it, under the effect of an external action, from a closed position to an open one; a catch (1,3,1',3') adapted to be applied to a fixed part (14) of said door, adapted to engage one end of said rod in closed position; return means (11) adapted to return said rod to closed position ceasing said external action and that said catch comprises a receding element (3,3') adapted to assume a normal position (3,3a') and a retracted one (3b,3b') and pushed into the normal position by elastic means (5,5'), said receding element adapted to be pushed towards the retracted position by said rod during the closing movement of the door wing.