Punching Machine Handle Coupling to Reduce Contact Deformation
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Solution Overview
Problem
The existing handle devices for drilling machines suffer from deformation at contact points between the handle member and the rotating shaft member due to uneven pressure distribution, leading to increased backlash and potential uncoupling issues, especially when the coupling engaging portion is formed as a regular polygon with a larger number of sides to allow finer angle adjustments.
Innovation Solution
The handle device features a rotating shaft member with a coupling recess and a handle member having a coupling engaging portion that can be pressed at a larger angle, reducing deformation risk and incorporating multiple coupling recesses to allow coupling in various directions without compromising the angle precision, along with an uncoupling mechanism to facilitate rapid coupling and uncoupling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coupling engaging portion is formed as a regular polygon with a larger number of sides to allow finer angle adjustments, then the adaptability for different coupling angles is improved, but the deformation at contact points increases due to uneven pressure distribution
Solution Approach 1:
The patent applies local quality by providing reinforcing ribs at specific locations on the coupling engaging portion. These ribs are strategically positioned at the contact points where pressure is applied during coupling, locally strengthening these areas to resist deformation while maintaining the overall polygonal shape that enables angle adjustment capability.
Solution Approach 2:
The patent introduces asymmetry by adding reinforcing ribs that break the perfect symmetry of the regular polygon shape. These ribs create asymmetric structural reinforcement at critical contact points, allowing the coupling portion to handle uneven pressure distribution better while still maintaining the ability to couple at multiple angles.
2Adaptability or versatility
If the coupling engaging portion is formed as a regular polygon with a larger number of sides, then the number of couplable directions is increased, but the pressure distribution at contact points becomes uneven leading to deformation
Solution Approach 1:
The reinforcing ribs provide localized structural support at the contact points where pressure is applied. This local reinforcement allows the coupling engaging portion to maintain its polygonal shape with multiple sides for various coupling directions, while the ribs specifically address the pressure concentration issue at contact points.
3Adaptability or versatility
If the handle member is rotated relative to the rotating shaft member to change coupling angle, then the adaptability for different drilling angles is improved, but the contact points between coupling hole and coupling engaging portion experience wear and deformation
Solution Approach 1:
The reinforcing ribs are positioned at the contact points between the coupling engaging portion and the coupling hole. This local reinforcement protects these critical areas from wear and deformation that occur during rotation and angle adjustment, thereby maintaining coupling reliability while allowing angle variation.
Solution Approach 2:
The reinforcing ribs act as preventive structural elements that are in place before any wear or deformation occurs. They provide ahead-of-time structural support to the contact points, preventing the wear and deformation that would otherwise occur during repeated rotation and angle adjustment operations.
Data Source
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AI summary
[Technical Problem] Provided is a handle device in which deformation is unlikely to occur at a point of contact between a handle member and a rotating shaft member. [Solution to Problem] A handle device 20 includes a holding member 26, a handle member 22, and a rotating shaft member 24. The handle member 22 has a shaft part 50 formed with first and second coupling engaging portions 54a and 54b and first and second uncoupling portions 56a and 56b. The rotating shaft member 24 has a coupling recess 72 formed in a coupling end face 68 facing the shaft part 50, the coupling recess 72 extending in a radial direction about a rotation axis R. When the handle member 22 is in a coupled position, the first and second coupling engaging portions 54a and 54b are engaged with the coupling recess 72 at respective positions at opposite sides of the rotation axis R in the direction of a longitudinal axis M, thereby allowing the handle member 22 to be coupled to the rotating shaft member 24 in the direction of rotation. When the handle member 22 is displaced in the direction of the longitudinal axis M to an uncoupled position, the first and second coupling engaging portions 54a and 54b and the coupling recess 72 are uncoupled from each other, thereby enabling the handle member 22 to be rotated relative to the rotating shaft member 24.