Brake Release Knob Anchoring via Cap Intermediary
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Solution Overview
Problem
Conventional brake release knobs face issues with variations in anchoring allowance leading to incomplete anchoring and potential damage during assembly, as the engagement between the brake release knob and release rod is difficult to verify.
Innovation Solution
The brake release knob is assembled with a clearance fit using a cap and leg part design, where the leg part's flange engages with the cap's innermost end, and a fixing claw on the cap secures it to the brake lever, ensuring a predetermined anchoring force without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If interference fit is used to anchor the brake release knob to the release rod, then anchoring force can be obtained, but variations in anchoring allowance cause either insufficient anchoring force or fracture of the knob
Solution Approach 1:
The patent introduces a cap as an intermediary component between the brake release knob and the release rod. The cap receives the brake release knob via clearance fit and anchors it to the release rod, thereby mediating the connection and eliminating the need for direct interference fit. This resolves the contradiction by providing reliable anchoring without the risks of insufficient force or fracture associated with interference fit variations.
Solution Approach 2:
The patent segments the anchoring function into two separate components: the cap and the brake release knob. The cap is responsible for receiving and anchoring the knob, while the knob itself remains undamaged. This segmentation allows the anchoring force to be applied to the cap rather than directly to the knob, preventing fracture while ensuring reliable anchoring.
2Device complexity
If the engagement portion between the brake release knob and release rod is located inside the assembly, then the structure is compact, but it becomes difficult to verify positive anchoring
Solution Approach 1:
The cap serves a dual function: it anchors the brake release knob to the release rod while simultaneously providing a visible indicator of proper assembly. The protrusion of the cap from the brake lever distal end automatically signals that the knob is correctly positioned and anchored, eliminating the need for additional verification steps while maintaining structural compactness.
Data Source
AI summary
An assembled structure of brake release knob that assures a predetermined anchoring force, and reliable anchoring with no damage being caused in assembling. A cap (80) is fixed in a brake lever distal end part (11); a brake release knob (20) is inserted into the cap (80); a flange part (23) formed on a leg part (22) extending from a head part (21) of the brake release knob is engaged with an innermost end (85) of the cap; in the brake lever distal end part (11), a distal end part taperedly extending from a shoulder part (72) of a release rod (70) is inserted closer to the center of the cap (80) than the leg part (22) of the brake release knob; and between the shoulder part (72) and the innermost end (85) of the cap, the flange part (23) of the brake release knob is sandwiched under pressure.