Bayonet Electrical Contact Decoupling for Vibration Resistance
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Solution Overview
Problem
Electrical apparatuses with bayonet connections, used in devices like fire alarms, face issues with contact reliability due to deformation and vibrations, leading to potential damage from excessive force during handling and loose connections, especially when mounted on uneven surfaces or high locations.
Innovation Solution
The solution involves using first and second contact means that engage only during relative rotation of the functional head in relation to the base, with encoding lugs and recesses ensuring correct alignment and resistance torque for secure connection, decoupling contact formation from axial adjustment and preventing damage from excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical contacts are formed in the bayonet connection, then electrical connection is achieved, but the contacts are subject to loading by axial displacement and relative displacement during handling
Solution Approach 1:
The invention separates the electrical contact function from the mechanical connection function. The electrical contacts are formed independently of the bayonet connection mechanism, so that axial displacement and relative rotation during handling do not load the electrical contacts. This segmentation allows each function to be optimized independently - the bayonet connection handles mechanical coupling while the electrical contacts remain stationary and undisturbed.
Solution Approach 2:
The electrical contact-making function is extracted from the bayonet connection sequence. Contacts are made during axial adjustment before any relative rotation occurs, and the contacts are positioned such that subsequent rotational movement does not affect them. This extraction removes the harmful coupling between mechanical handling and electrical contact integrity.
2Ease of operation
If picker rods are used to handle the functional head, then high-level mounting is accessible, but excessive force may bend or damage sensitive parts and electrical contacts
Solution Approach 1:
The invention provides beforehand protection for electrical contacts by positioning them such that they are not in the path of force application during handling. The contact-making occurs during axial adjustment when the functional head is being properly installed, not during subsequent handling operations. This prior positioning cushions the contacts against damage from picker rod operations.
3Reliability
If secure bayonet connections are formed with complex designs, then contact reliability is improved, but manufacturing cost and installation outlay increase
Solution Approach 1:
The invention segments the connection functions into distinct operational phases: axial adjustment for contact-making and mechanical coupling, followed by relative rotation for locking. This segmentation allows a simple bayonet design to achieve secure connection without complex mechanisms, because the electrical contact function is separated from the locking function.
Solution Approach 2:
Electrical contacts are made during the preliminary axial adjustment phase, before the relative rotation and locking phases occur. This preliminary action ensures that contacts are established when the components are still easily accessible and aligned, without requiring complex mechanisms to maintain contact pressure during subsequent rotational operations.
4Adaptability or versatility
If the apparatus is fitted on an uneven substrate, then mounting flexibility is improved, but contact reliability deteriorates due to deformation
Solution Approach 1:
The invention separates mechanical coupling functions from electrical contact functions. The bayonet connection accommodates substrate unevenness through its inherent mechanical tolerance during axial adjustment and rotation, while the electrical contacts, being positioned independently, are not affected by the deformation. This segmentation allows the mechanical connection to adapt to uneven substrates without compromising electrical contact 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
This design enhances contact reliability by preventing damage to electrical contacts during handling and reduces the impact of mounting tolerances and vibrations, allowing for simpler production and easier assembly with improved user feedback on connection status.
Implementation Method 1
a first frictional effect in the axial direction and a second frictional effect in the peripheral direction
Implementation Method 2
normal effect in the axial direction
Data Source
AI summary
An electrical apparatus (1) comprising a base (2) for being attached to a substrate (4), a functional head (3) which has at least one electrical or electronic functional device (10), wherein the functional head (3) is attached to the base (2) with a bayonet connection (6), wherein the base (2) has a first contact (14) and the functional head (3) has a second contact (30), which are contact-connected to one another, wherein the bayonet connection (6) can be formed by a relative movement of the functional head (3) in relation to the base (2) in an axial direction (A), and a subsequent relative rotation, and the first contact (14) and second contact (30) can be contact-connected to one another by the relative rotation.