Expansion Bolt Joint for Rotatable Cutting Tool Tension Locking
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Solution Overview
Problem
Existing joint mechanisms for rotatable cutting tools, such as those using a bolt and nut, face issues with accidental rotation leading to inconsistent tension, affecting the cutting accuracy of blades.
Innovation Solution
Incorporating an expansion bolt within a cavity at the end of the bolt, which expands to lock the nut in place, preventing accidental rotation and allowing for easy adjustment of tension by moving the expansion bolt into or out of the cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bolt and nut are used to attach cutting blades rotatably, then the joint can be assembled and tension adjusted, but the bolt and nut may accidentally rotate leading to inconsistent tension
Solution Approach 1:
The expansion bolt is nested within a cavity in the bolt, allowing the bolt to expand radially when the expansion bolt is rotated. This nested structure enables the locking function while maintaining a compact design, preventing accidental rotation of the nut relative to the bolt.
Solution Approach 2:
The bolt transitions from a static state to a dynamic expanded state when the expansion bolt is rotated. This dynamic expansion creates friction or mechanical interference that locks the nut in place, preventing accidental rotation while allowing intentional adjustment when needed.
2Manufacturing precision
If the joint tension is adjusted by rotating the bolt and nut, then the cutting accuracy can be optimized, but the adjustment mechanism is complex and time-consuming
Solution Approach 1:
The adjustment mechanism is segmented into two independent functions: tension adjustment (via nut rotation) and locking (via expansion bolt rotation). This segmentation allows for quick locking without requiring complex adjustment mechanisms, reducing adjustment time while maintaining cutting accuracy.
Solution Approach 2:
The expansion bolt acts as an intermediary locking mechanism that secures the nut in place after tension adjustment. This intermediary element prevents the need for complex anti-loosening mechanisms during adjustment, simplifying the overall process and reducing time loss.
3Reliability
If an expansion bolt is used to prevent accidental rotation, then the joint stability is improved, but the device complexity increases
Solution Approach 1:
The expansion bolt is merged with the existing bolt structure, utilizing the same axial space and integration points. This merging approach adds the locking function without requiring separate components or complex assembly procedures, minimizing the increase in device complexity.
Solution Approach 2:
The bolt serves multiple functions: it provides the primary mechanical connection, allows for tension adjustment through nut rotation, and prevents accidental rotation through expansion. This multi-functionality reduces the need for additional components, keeping the device complexity low while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures consistent tension in the joint, preventing accidental loosening and allowing for repeated, user-friendly adjustments without compromising functionality.
Implementation Method 1
an expansion bolt (12) arranged within a cavity (14) in the second end (9) of the bolt (5), which when rotated in relation to the bolt (5) expands the second end (9) of the bolt (5)
Data Source
Figure 1~4
AI summary
The invention relates to a joint (2) comprising a bolt (5) with a head (6) in a first end (7), with a thread (8) in a second end (9), and with an intermediate section (10) between the first end (7) and the second end (9) which during attachment of two objects rotatably to each other protrudes trough openings in said objects. A nut (11) is received on said thread (8). In order to provide an easy solution for adjusting the tension of the joint at the same time as accidental loosening of the joint may be efficiently prevented the bolt (5) is provided with a cavity (14). An expansion bolt (12) with a threaded end (13) protrudes into said cavity (14) and expands the second end (9) of the bolt.