Hand-Held Cutting Tool Layout for Balance and Dust Collection
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Solution Overview
Problem
Existing circular saws have an unbalanced and oversized design, and the dust suction inlet is not effectively positioned to efficiently collect dust from saw blades at different positions, leading to suboptimal performance and usability.
Innovation Solution
The hand-held cutting tool features a symmetrically arranged handle, a detachable battery pack, a dual-position baseplate, and a shield with a chip discharging passage and tube, along with an auxiliary handle for improved balance and dust management, allowing the cutting member to be mounted in different positions for various cutting tasks and equipped with a protective member for enhanced safety and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the circular saw uses a conventional design structure, then it can perform basic cutting functions, but the overall size becomes large and the balance is poor
Solution Approach 1:
The dust collection system is nested within the housing structure, with the dust collection chamber integrated into the existing housing space. The dust collection inlet is positioned on the housing surface, allowing the dust collection function to be incorporated without adding external volume, thus maintaining compact size while improving balance through optimized mass distribution
Solution Approach 2:
The cutting member is configured to rotate around a third axis that is perpendicular to the first axis of the output shaft. This dimensional change allows the cutting head to be positioned more centrally relative to the handle, improving balance while maintaining a compact overall footprint. The baseplate can also rotate about a second axis parallel to the third axis, providing additional dimensional flexibility for positioning components optimally
2Productivity
If the dust suction inlet is positioned in a conventional location, then the structure remains simple, but it cannot effectively suck in dust from saw blades mounted at different positions
Solution Approach 1:
The dust collection inlet is positioned on the housing to receive dust from multiple cutting positions. The shield structure with its open front end and partition plate creates a universal dust collection zone that can capture dust regardless of which mounting position the cutting member is in, making the dust collection system effective for multiple functions without requiring multiple inlets or complex switching mechanisms
Solution Approach 2:
The shield is divided into a rear shield portion and a front shield portion by a partition plate, creating separate first and second mounting areas. This segmentation allows the dust collection system to handle dust from different cutting positions through separate chip discharging passages, improving dust suction efficiency while maintaining a relatively simple overall structure
3Adaptability or versatility
If the cutting member is fixed in one position, then the structure is simple, but it cannot perform various cutting tasks requiring different blade positions
Solution Approach 1:
The baseplate is made rotatable about a second axis, allowing it to rotate between a first rotation position and a second rotation position. This dynamic capability enables the cutting member to be positioned at different angles and locations relative to the housing, providing versatility for various cutting tasks while maintaining a simple single-baseplate structure rather than requiring multiple fixed bases
4Reliability
If the shield encloses the cutting member completely, then safety is improved, but chip discharge becomes difficult
Solution Approach 1:
The shield is designed with differentiated enclosure: the rear shield portion encloses the cutting member for safety, while the front shield portion has an open front end to facilitate chip discharge. The partition plate creates local separation between the first and second mounting areas, allowing chips to be discharged through separate passages. This local differentiation maintains safety where needed while enabling easy chip removal where required
Data Source
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AI summary
A hand-held cutting tool includes a cutting member (17), a motor (12), a housing (11), a baseplate (14), a drive shaft (161), a transmission device (15) and a shield (30,60). The motor (12) has an output shaft (121) rotating around a first axis (101). The housing (11) is provided with a handle portion (22,111). The baseplate (14) having a supporting surface (141) connects to the housing (11) and is rotatable about a second axis (102). The drive shaft (161) drives the cutting member (17) to rotate around a third axis (103) perpendicular to the first axis (101). The shield (30, 60) encloses at least in part the cutting member (17) in a circumferential direction of the third axis (103). The first axis (101) obliquely intersects the supporting surface (141). The supporting surface (141) is parallel to the third axis (103). The shield (30,60) and the handle portion (22,111) are disposed on a same side of the supporting surface (141). The second axis (102) is parallel to the third axis (103).