Interchangeable Trimmer Head Assemblies for String and Blade Trimming
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Solution Overview
Problem
Existing trimmer heads face issues with inefficient trimming due to increased distance between the trimming line and the ground, difficulty in controlling lawn flatness, and vulnerability of the lower housing when encountering hard objects, leading to damage and costly replacements.
Innovation Solution
A trimmer head design with an upper cover assembly that can be removably connected to either a string trimming assembly or a blade trimming assembly, featuring connection holes for secure mounting and impact resistance, allowing independent replacement of components and enhancing impact absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the connection position of the trimming line is raised from the middle of the lower cover to the upper edge of the lower cover, then the distance between the trimming line and the lawn ground increases, but the trimming efficiency reduces and it becomes more difficult to control the flatness of the lawn
Solution Approach 1:
The lower cover is divided into a first lower cover for string trimmers and a second lower cover for blade trimmers, each with optimized connection positions. The first lower cover has the connection position at the upper edge while the second lower cover has it at the middle position, allowing each type to operate at its optimal efficiency without compromising the other.
2Ease of manufacture
If the blade is mounted on the lower housing through the plug-in connector, then the blade can be easily installed, but when the blade encounters a hard object, the force is directly transferred to the lower housing making it easy to damage and requiring replacement of the whole lower housing
Solution Approach 1:
The lower housing is segmented into a first lower cover and a second lower cover, each with dedicated mounting structures for their respective cutting members. The first lower cover includes a first mounting structure with a first receiving hole while the second lower cover includes a second mounting structure with a second receiving hole, allowing independent reinforcement of stress points without affecting the entire housing.
Solution Approach 2:
Reinforcement holes are added at specific stress-concentrating locations on the lower covers where blades mount. The first lower cover has reinforcement holes at positions corresponding to blade mounting points, and the second lower cover has similar reinforcement holes, providing localized strength enhancement exactly where impact forces are applied during operation.
3Device complexity
If a single lower housing is used for both string and blade trimmers, then the structure is simplified, but it requires big changes in structure when designing two different kinds of trimming assembly, making the lower housing easy to damage and requiring replacement
Solution Approach 1:
The upper cover assembly serves as a universal component that can accommodate both string trimmer and blade trimmer configurations. It includes a universal mounting structure with connection holes that can receive either the first lower cover or the second lower cover, allowing one upper assembly to support two different trimming types while maintaining structural integrity and durability for each configuration.
Data Source
AI summary
A trimmer and a trimmer head include an upper cover assembly being connected to and driven by a motor, wherein the upper cover assembly is configured to be removably connected to at least one of a first trimming assembly or a second trimming assembly selectively, and is provided with at least one connection hole in its side wall; the first trimming assembly is configured to include a first lower cover, a first cutting member, and a first base; the second trimming assembly is configured to include a second lower cover, a second cutting member, and a second base; wherein the first base is at least partially inserted into the connection hole when the first trimming assembly is mounted, and the second lower cover is at least partially inserted into the connection hole when the second trimming assembly is mounted.