Toaster with mechanical delay shut-off mechanism
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Solution Overview
Problem
Conventional toasters lack an effective shut-off mechanism to ensure power is not supplied to heating elements beyond a duration 60 seconds longer than the maximum toast cycle, as required by regulatory agencies like UL.
Innovation Solution
A shut-off mechanism comprising a frame with a damper arm, a viscous fluid-filled cavity, and a cocking lever, where the damper arm is biased to a deactivated position and activated position, and an electrical switch engages or disengages based on the damper arm's position, ensuring controlled power supply and shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pop-up toaster is used without a delay shut-off mechanism, then the toaster structure is simple and easy to manufacture, but the toaster fails to comply with regulatory standards requiring power shut-off 60 seconds after the maximum toast cycle
Solution Approach 1:
The patent introduces a damper arm as an intermediary mechanical component that mediates between the bread tray's upward movement and the electrical switch. The damper arm includes a delay mechanism (such as a viscous fluid-filled chamber or friction element) that slows its rotation, creating a time delay between the bread tray reaching the raised position and the electrical switch opening. This intermediary mechanism enables compliance with the 60-second delay requirement without requiring complex electronic timing circuits.
Solution Approach 2:
The patent replaces electronic timing circuits and microcontrollers with a purely mechanical delay mechanism. The damper arm uses physical principles such as viscous damping, friction, or spring-mass systems to create the required time delay. This mechanical substitution simplifies the overall system by eliminating electronic components while achieving the same functional result of delaying power shut-off by 60 seconds after the toast cycle completes.
2Duration of action of moving object
If the electrical switch disengages immediately when the bread tray returns to the raised position, then the response time is fast, but the heating elements remain powered beyond the required shut-off period
Solution Approach 1:
The patent prepares the damper arm in advance during the toasting cycle. As the bread tray moves upward during normal operation, the damper arm begins to rotate but is deliberately slowed by the delay mechanism. This preliminary action ensures that when the bread tray reaches the raised position and the toasting is complete, the damper arm continues rotating for an additional 60 seconds, maintaining electrical contact and powering the heating elements until the required delay period elapses, at which point the switch opens and power is cut off.
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 mechanism effectively manages power supply to heating elements, ensuring compliance with regulatory standards by maintaining an open circuit after the toast cycle, preventing prolonged heating element activation.
Implementation Method 1
the damper unit including (a) a cavity in which a viscous fluid is stored, (b) a rotor that resides partially in the cavity and partially outside of the cavity, the viscous fluid resisting rotation of the rotor relative to the cavity
Data Source
AI summary
A shut-off mechanism for a toaster includes a damper arm pivotally mounted on a frame that includes a damper unit. The damper unit including (a) a cavity in which a viscous fluid is stored, (b) a rotor that resides partially in the cavity and partially outside of the cavity, the viscous fluid resisting rotation of the rotor relative to the cavity, and (c) an engagement member attached to the rotor that engages a track on the frame. The damper arm is movable between a deactivated position and an activated position. An electrical switch configured to engage an electrical contact when the damper arm is in the activated position and to disengage from the electrical contact when the damper arm is in the deactivated position.