Cotter Pin Bending Device With Rotating Holding Element
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Solution Overview
Problem
Existing methods for bending cotter pins, such as using a hammer, can damage the secured component, vary in quality and time, and pose a risk of injury, especially as the thickness of the cotter pin increases.
Innovation Solution
A device with a tool body and a holding member that allows for relative rotation between the holding component and the tool body, enabling reliable and quick bending of cotter pin ends without the need for a hammer, reducing the risk of injury and component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hammer is used to bend cotter pin ends, then the bending operation can be performed, but the component to be secured can be damaged by the hammer blows
Solution Approach 1:
The patent introduces a dedicated bending tool as an intermediary device between the operator and the cotter pin. This tool includes a holding component for securing the cotter pin and a bending component with a bending edge that contacts the cotter pin end. The intermediary tool performs the bending operation without requiring direct hammer blows on the component to be secured, thereby eliminating damage while maintaining bending capability
Solution Approach 2:
The patent replaces the direct mechanical impact method (hammer blows) with a controlled mechanical leverage system. The bending tool uses a lever arm mechanism where the bending component applies gradual mechanical force to bend the cotter pin end against a support surface, substituting the chaotic high-impact mechanical system with a controlled low-impact mechanical system that achieves the same bending result without damage
2Ease of manufacture
If a hammer is used to bend cotter pin ends, then the bending operation can be performed, but the quality of work and the time required vary considerably
Solution Approach 1:
The bending tool is designed to be self-aligning and self-regulating. The holding component automatically positions the cotter pin, and the bending component with its bending edge and support surface creates a predetermined bending geometry. The tool structure itself ensures consistent bending quality without requiring operator skill or judgment, making the work quality independent of the operator's experience level
Solution Approach 2:
The patent changes the operational parameters from uncontrolled hammer impacts to controlled mechanical leverage with fixed geometric parameters. The bending edge angle, support surface position, and lever arm length are all fixed parameters that determine the bending outcome. This parameter standardization ensures consistent bending quality and predictable operation time across different users and situations
3Ease of manufacture
If a hammer is used to bend cotter pin ends, then the bending operation can be performed, but there is a risk of injury for the user of the hammer
Solution Approach 1:
The patent replaces the dangerous direct-impact mechanical system (hammering) with a safe leveraged mechanical system. The bending tool uses mechanical advantage through a lever arm to perform the bending operation with controlled force applied by the operator, eliminating the need for high-velocity impacts that pose injury risks. The force is applied gradually through the tool structure rather than through direct hammer strikes
4Strength
If the thickness of the cotter pin increases, then the securing strength increases, but the effects of hammer blows increase accordingly causing more damage
Solution Approach 1:
The bending tool serves as an intermediary that can handle increased cotter pin thickness without transmitting damaging forces to the component. The tool's holding component securely grips thicker cotter pins, and the bending component applies distributed mechanical force through contact with the bending edge and support surface, preventing the concentrated impact forces that would damage the component while still achieving the necessary bending of thicker material
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
The device ensures consistent quality and safety in bending cotter pin ends, reducing the risk of injury and component damage, while adapting to various cotter pin sizes and geometries.
Implementation Method 1
one end of a cotter pin held on the holding component can be bent by a relative rotation between the holding component and the tool body on the bending element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a device (18) for bending a cotter pin (4) to secure the position of a workpiece (2), in particular to prevent rotation of a crown nut. The device comprises a tool body (22) and a holding element (20) for holding the cotter pin (4) during a bending operation. The holding element (20) is rotatably mounted on the tool body (22). The device (18) has a bending element (26) which is arranged on the tool body (22) such that one end of a cotter pin (4) held on the holding element (20) can be bent at the bending element (26), in particular flush with the workpiece (2), by a relative rotation between the holding element (20) and the tool body (22).