Grinder Wheel Cover Holding Mechanism Offset Line Design
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Solution Overview
Problem
The existing grinders with wheel covers are larger due to the arrangement of the arresting device, which necessitates a more compact design for the wheel cover holding mechanism.
Innovation Solution
A grinder design featuring a collar with an annular attachment portion and a holding member that includes an engagement portion and an engagement portion operating member, which moves linearly on a parallel offset line to reduce the size of the wheel cover holding mechanism, allowing for a downsized grinder structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the engagement portion operating member is moved linearly on the first line passing through the center of the attachment portion, then the engagement is stable, but the length of the wheel cover holding mechanism in the predetermined direction becomes equal to the total length of the outside diameter of the attachment portion and the movable region of the engagement portion operating member, resulting in a larger size
Solution Approach 1:
The patent applies dimensionality change by moving the engagement portion operating member from the first line (passing through the center) to the second line (parallel offset line). This shifts the movement trajectory to a different spatial dimension/position, allowing the mechanism to achieve stable engagement while reducing the overall length of the holding mechanism in the predetermined direction.
2Ease of operation
If the grinder is designed with a conventional arresting device that moves linearly in the radial direction, then the safety guard can be held at pre-selected angular positions, but the grinder becomes larger due to the extended area required for the arresting device
Solution Approach 1:
The patent reduces grinder size by changing the movement dimension of the engagement portion operating member from radial movement through the center to movement along a parallel offset line. This dimensional change allows the safety guard to be held at pre-selected angular positions without requiring the extended area that would result from conventional radial movement through the center.
3Length of moving object
If the engagement portion operating member is moved on the second line parallelly offset from the first line, then the length of the wheel cover holding mechanism is shortened to equal the longer component between the engagement portion operating member and the outside diameter of the attachment portion, but the engagement mechanism becomes more complex
Solution Approach 1:
The patent segments the engagement mechanism into distinct components: the engagement portion, the engagement portion operating member, and the attachment portion. This segmentation allows each component to be optimized independently, with the operating member moving along the parallel offset line to reduce overall length while maintaining manageable complexity through clear functional separation.
Data Source
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AI summary
A grinder (1) comprises a body having an annular portion (62), a wheel cover (40) which is attachable to the annular portion (62), and a wheel cover holding member (70) which holds the wheel cover (40). The wheel cover (40) has a cylindrical portion (42) which is attachable to the annular portion (62). The wheel cover holding member (70) has a slide member (71) and a pressing portion (91) which moves the slide member (71) . The pressing portion (91) switches a state between an engagement state in which the slide member (71) is engaged with the cylindrical portion (42) and a disengagement state in which the slide member (71) is disengaged with the cylindrical portion (42) by moving the slide member (71). The pressing member (91) moves on a second line which is parallelly offset from a first line passing the center of the annular portion (42) in a predetermined direction.