Flat-Head Grinder Screw Housing Layout for Narrow Access
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Solution Overview
Problem
Existing flat-head grinders have a thickness that prevents them from being inserted into narrow locations, limiting their usability.
Innovation Solution
The grinder design includes a through-hole in the gear housing with a female thread, allowing for a screw fixation without incomplete thread portions, and an access angle less than 42°, reducing the head portion's thickness and enabling insertion into constrained spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a blind screw hole is used in the gear housing, then the screw can be fixed securely, but the thickness of the head portion increases, preventing insertion into narrow locations
Solution Approach 1:
Instead of using a blind screw hole (hole closed at one end), the patent uses a through-hole (hole open at both ends) in the gear housing. This inversion allows the screw to pass completely through the gear housing and bear against the bearing box, securing both components while reducing the head portion thickness by eliminating the need for additional wall thickness to close the screw hole.
2Ease of operation
If the head portion thickness is reduced to enable insertion into narrow locations, then insertability improves, but the structural integrity and screw fixation may be compromised
Solution Approach 1:
The patent changes the screw fixation approach from a single-component blind hole configuration to a multi-component through-hole configuration where the screw passes through the gear housing and secures the bearing box. This dimensional change in the fixation mechanism allows thin-walled gear housing to achieve reliable fixation by distributing the load across multiple components (gear housing, screw, bearing box) rather than relying solely on the gear housing wall thickness.
Data Source
AI summary
A grinder includes: an electric motor having a motor shaft extending in a first direction; a final output shaft extending in a second direction orthogonal to the first direction and on which a tool accessory is mountable; first and second bearings that rotatably support the final output shaft, the second bearing that being located closer to the tool accessory in the second direction than the first bearing; a gear housing having a first through-hole, which passes through the gear housing in the second direction has a female thread; a bearing box that supports the second bearing and has a second through-hole passing through the second through-hole in the second direction coaxially with the first through-hole; and a screw threadedly engaged with the first through-hole and is inserted in the direction from the bearing box toward the gear housing to fixes the gear housing and the bearing box to each other.