Retracting and extending control selectors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current child safety lockout mechanisms for appliance control knobs do not provide a reliable system that balances ease of access for adult users with protection from accidental operation by children.
Innovation Solution
A retractable and extendable control knob system that can be selectively operated, allowing access for authorized users through various control methods such as switches, programmable selectors, or user interfaces, while preventing operation by retracting the knobs into a recess when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control knobs are made easily accessible to users, then ease of operation is improved, but child safety is worsened due to ready access for children and others lacking judgment
Solution Approach 1:
The control knobs transition between two dynamic states: extended (accessible) and retracted (protected). The support structure enables linear motion of the knobs along the axis of the recess, allowing the system to dynamically adjust accessibility based on safety requirements. When the panel is in the closed position, knobs are retracted; when opened, knobs extend to usable positions.
Solution Approach 2:
The control knobs are nested within a recess in the appliance panel. The support structure allows the knobs to be inserted into and withdrawn from the recess, creating a nested configuration when retracted that protects them from accidental access while maintaining easy accessibility when extended.
2Object-affected harmful factors
If simple lockout mechanisms like spring-loaded shafts are used, then child safety protection is improved, but reliability is worsened as they do not offer reliable safety lockout
Solution Approach 1:
A panel structure serves as an intermediary barrier between the user and the control knobs. The panel can be positioned in a closed position that physically blocks access to the knobs, providing a more reliable safety mechanism than direct contact with spring-loaded shafts. This intermediary structure creates a physical separation that enhances safety reliability.
Solution Approach 2:
The safety mechanism moves from a one-dimensional rotational lock (spring-loaded shaft) to a two-dimensional panel positioning system. The panel can be in either a closed or open position, creating a dimensional barrier that is more reliable than simple rotational locking. The knobs extend and retract along the axis of the recess, adding another dimension to the safety mechanism.
3Reliability
If control knobs are retracted into recess to prohibit operation, then safety lockout is improved, but ease of operation is worsened for authorized users
Solution Approach 1:
The panel opening action and knob extension action are merged into a single coordinated operation. When the panel is opened, the control knobs automatically extend from the recess to their usable positions. This combining of actions ensures that authorized users who open the panel immediately gain access to the controls without requiring separate unlocking or extension steps.
Solution Approach 2:
The panel is designed to be opened before the knobs need to be accessed. By providing a panel that can be opened to expose the knobs, the system performs the accessibility preparation in advance. The knobs are preliminarily positioned in the retracted state within the recess, and the panel opening action prepares them for use by allowing the user to reach them.
Data Source
AI summary
A system for inhibiting and providing access to appliance control knobs includes a support structure for mounting individual control knobs or groups thereof, and an actuator assembly for extending and retracting control knobs either individually or collectively.