Two-Step Oven Door Lock Using Solenoid for Child Resistance
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Solution Overview
Problem
Conventional oven door opening mechanisms lack child resistance, posing a safety risk as children can easily open the oven door even when it contains hot contents, and existing solutions that use solenoids to block the door are not functional during shipping or when the oven is unplugged.
Innovation Solution
A two-step door opening mechanism that employs a solenoid to lock the oven door during cooking cycles, requiring a user to press both an electronic button and a mechanical button sequentially to open the door, with the option to disable the mechanism via a predefined sequence on the control panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single button mechanism is used for door opening, then the ease of operation is improved, but the child resistance is worsened
Solution Approach 1:
The door opening function is segmented into two distinct actions: an electronic button press followed by a mechanical button press. This segmentation ensures that a single action (pressing one button) is insufficient to open the door, thereby providing child resistance while maintaining ease of operation for adults who can perform the two-step sequence
Solution Approach 2:
The electronic button must be pressed first to activate the mechanical button functionality. This preliminary action creates a dependency sequence where the first action (electronic button) enables the second action (mechanical button), ensuring that accidental or unauthorized opening attempts are prevented while maintaining a straightforward operation flow for authorized users
2Object-affected harmful factors
If a solenoid locking mechanism is added to block the door, then the child resistance is improved, but the device complexity is worsened
Solution Approach 1:
The solenoid acts as an intermediary component that translates the electronic button press into a mechanical state change. When the electronic button is pressed, the solenoid temporarily enables the mechanical button by moving its shaft to an unlocked position, creating a time-limited window for door opening without requiring complex continuous locking mechanisms
Solution Approach 2:
The patent replaces traditional continuous mechanical locking mechanisms with an electronic control system using a solenoid. This substitution reduces the need for complex mechanical linkages, springs, and latches by using electronic signaling and temporary magnetic actuation to control door access
3Object-affected harmful factors
If the solenoid is used to lock the door during cooking cycles, then the child resistance is improved, but the reliability is worsened when the oven is unplugged or during shipping
Solution Approach 1:
The solenoid shaft is designed to be dynamically positionable between locked and unlocked states based on electrical power availability. When power is supplied during normal operation, the shaft moves to the locked position for child resistance. When power is removed (unplugged or shipping), the shaft automatically returns to the unlocked position, ensuring the door remains accessible without requiring complex backup 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
Provides effective child resistance by requiring two distinct actions to open the oven door, ensuring safety while maintaining ease of operation and allowing the mechanism to be enabled or disabled based on user input, ensuring both buttons remain accessible for adult users.
Implementation Method 1
A solenoid, comprising a shaft configured to slide laterally between a first, unlocked position in which the shaft allows opening of the oven door and a second, locked position in which the shaft blocks the opening of the oven door
Data Source
AI summary
A two-step door opening mechanism for an oven is provided. A mechanical button and an electronic button are provided, the oven defining an oven cavity openable and closable by an oven door. A controller is provided. A digital valve, comprising a shaft configured to slide laterally between a first, unlocked position in which the shaft allows inward movement of the mechanical button and a second, locked position in which the shaft blocks the inward movement of the mechanical button. The electronic button, once actuated, is operable to cause the controller to direct the digital valve to move the shaft from the second, locked position into the first, unlocked position to unlock the mechanical button, and the mechanical button, once actuated, is operable to open the door when the shaft is in the first, unlocked position.