Vehicle Door Immobilizer Bolt Trigger Mechanism
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Solution Overview
Problem
Existing devices for immobilizing vehicle body openings during surface treatment processes often cause particle detachment from coatings, leading to defects in subsequent layers due to rubbing contact between the bolt and the edge of the opening.
Innovation Solution
A device with a frame-attached bolt that can retract to avoid edge contact, featuring a trigger mechanism to prevent rubbing and a cam surface for initial friction to minimize particle formation, allowing the bolt to bypass the edge and engage securely without detaching particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bolt is designed to slide against the edge of the opening for immobilization, then the immobilization function is achieved, but particles detach from the coating due to friction
Solution Approach 1:
The patent introduces a sheet acting as an intermediary element between the bolt and the edge of the opening. The sheet is positioned such that the bolt engages behind it rather than directly against the edge, eliminating direct frictional contact. This mediator transfers the immobilization function while protecting the coating from particle detachment caused by rubbing.
Solution Approach 2:
The immobilization system is segmented into distinct functional elements: the bolt for engagement, the sheet as a protective intermediary, and the stop for positioning. By separating the direct contact function from the immobilization function, the design eliminates the harmful friction effect while maintaining the necessary locking capability.
2Object-generated harmful factors
If the bolt is retracted to avoid contact with the edge, then particle detachment is prevented, but the immobilization capability is reduced
Solution Approach 1:
The sheet serves as a mediator that enables the bolt to maintain engagement behind the edge without direct contact. The bolt remains in its engaged position providing full immobilization capability, while the sheet absorbs the frictional contact, allowing the bolt to stay extended rather than retracted.
3Reliability
If the bolt engages behind the edge of the opening, then secure immobilization is achieved, but friction causes coating particles to detach
Solution Approach 1:
The sheet acts as a protective intermediary positioned between the bolt and the coated edge. It allows the bolt to engage securely behind the edge for reliable immobilization while the sheet itself absorbs the frictional wear, preventing particle detachment from the coating and maintaining surface quality.
Solution Approach 2:
The design converts the potentially harmful friction effect into a beneficial arrangement where the friction acts on the sheet rather than the coated edge. The sheet becomes the sacrificial element that absorbs wear, protecting the valuable coating from particle detachment while still enabling secure immobilization.
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
Prevents particle detachment and ensures secure immobilization of the opening without compromising the coating, maintaining surface quality throughout the treatment process.
Implementation Method 1
the bolt being subjected to a force tending to make it protrude into its position of immobilization of the opening
Implementation Method 2
the outer edge of the bolt is shaped into a cam surface which allows it to be erased by the edge of the body on which it will rub, friction which can generate the formation of microparticles but only once
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The invention relates to a device for immobilizing a motor vehicle opening (5) hinged to the body (6) of the latter, in a position close to said body, comprising a frame (3, 4) attached to an inner face of the opening and forming the support for a bolt (7) adapted, in a first state, to be housed behind an edge (6a) of the body delimiting the opening to which the opening is associated, and in a second state, to be retracted to bypass said edge when the opening is moved away, the bolt being, on the one hand, subjected to the force of a return member (9) tending to make it protrude into its position immobilizing the opening and, on the other hand, being connected to an operating element tending to retract it against the aforementioned force, the frame (3, 4) comprising, opposite the bolt, a stop (10) intended to come into contact with said edge (6a) of the opening, characterized in that it includes a trigger (13) for locking the bolt (7) in its second state,whose arming is ensured by the operation of the bolt (7) towards its second state and whose retraction is ensured by the aforementioned edge (6a) of the opening of the case, acting as a trigger, thus releasing the bolt towards the aforementioned stop.