Spring-Arm Maintenance Flap for Low-Cost Tumble Dryer Access
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Solution Overview
Problem
Existing maintenance flaps for domestic appliances, such as tumble dryers, are complex and costly to produce due to intricate mountings and require significant effort to operate, which complicates handling and maintenance.
Innovation Solution
A maintenance flap design featuring a closing body with a lateral spring arm that acts as both a restoring force mechanism and a mounting element for the actuating element, eliminating the need for complex mountings and reducing production costs, while allowing easy manual operation by integrating the spring arms with the actuating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mountings are used for the actuating element, then the reliability of the maintenance flap is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The spring arm serves a dual function: it acts as both a mounting element for the actuating element and as a force-applying element that exerts restoring force. This merging of functions eliminates the need for separate complex mountings, thereby reducing device complexity while maintaining reliability through the integrated spring arm mechanism.
Solution Approach 2:
The spring arm is designed to perform multiple functions simultaneously: it provides mechanical support as a mounting structure, applies restoring force to return the actuating element to its initial position, and enables simple manual operation. This multi-functionality reduces the overall number of components and simplifies the device structure.
2Reliability
If complex mountings are used for the actuating element, then the reliability of the maintenance flap is improved, but the production cost increases
Solution Approach 1:
By combining the mounting function and force-application function into a single spring arm component, the number of parts to be manufactured and assembled is reduced. This simplification directly lowers production costs while the spring arm's inherent elastic properties ensure reliable operation.
Solution Approach 2:
The spring arm is designed to automatically return the actuating element to its initial position after actuation without requiring additional mechanisms or energy input. This self-service characteristic simplifies the overall system and reduces manufacturing complexity, thereby lowering production costs.
3Ease of operation
If the spring arms extend transversely to the engagement direction, then the ease of operation is improved, but the space requirement increases
Solution Approach 1:
The spring arms are oriented transversely to the engagement direction, extending in a direction perpendicular to the user's pushing motion. This spatial arrangement allows the spring arms to exert restoring force effectively without interfering with the linear engagement path, enabling easy manual operation while containing the spring arms within the transverse dimension rather than occupying additional longitudinal space.
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
Simplifies handling and reduces production costs by integrating spring arms with the actuating element, enabling easy operation with minimal effort and maintaining the appliance's aesthetic appearance.
Implementation Method 1
the actuating element can be acted upon with force in the direction of its rest position by means of the spring arms
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a maintenance flap (1) for a domestic appliance (14), in particular a tumble dryer, comprising a closing body (2) having at least one access opening (3), by which a maintenance opening of a housing (15) of the domestic appliance (14) can be closed, and at least one actuating element (4) which is disposed on the closing body (2) so as to be movable between a rest position and an actuating position. In the rest position of the actuating element the actuating element closes the access opening (3) and in the actuating position of the actuating element the actuating element at least partially frees the access opening (3). In order to provide a maintenance flap (1) which simplifies handling of a domestic appliance (14) and reduces the production costs thereof, according to the invention the actuating element (4) is fastened on opposing sides in each case via at least one lateral spring arm (6) to a rear face (7) of the closing body (2) facing an interior of the housing (15), wherein force is applied to the actuating element (4) in the direction of the rest position of the actuating element by means of the spring arms (6).