Iron Golf Club Head Weight Fixing Against Swing Loosening
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Solution Overview
Problem
Iron golf club heads face challenges in firmly attaching a weight member with higher specific gravity to the head body due to chemical composition differences, leading to potential loosening during swings.
Innovation Solution
The design includes a first hole in the sole portion for inserting the weight member from below and a second hole on the head body surface, with a fixing member inserted from a direction different from the weight member's insertion, using screws to securely attach the weight member without welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the weight member is attached to the head body by welding, then the joint strength may be sufficient, but the chemical composition difference between the weight member and head body makes welding difficult
Solution Approach 1:
The patent uses a fixing member as an intermediary component between the weight member and head body. This fixing member has a first portion that fits into a first hole in the head body and a second portion that engages with the weight member, thereby mediating the connection between two components with different chemical compositions that would be difficult to weld directly.
Solution Approach 2:
The connection system is segmented into three distinct components: the head body, the fixing member, and the weight member. This segmentation allows each component to be optimized for its specific function and material properties, avoiding the need to weld dissimilar materials directly while achieving strong mechanical attachment.
2Ease of manufacture
If the weight member is attached by a screw inserted from the bottom of the head, then attachment is achieved, but the screw loosens with repeated swings due to centrifugal force
Solution Approach 1:
Instead of inserting the fixing member from the bottom of the head in the conventional direction, the patent inverts the insertion direction by providing a second hole in the head body that allows the fixing member to be inserted from a direction different from the weight member's insertion direction. This inverted approach prevents the fixing member from loosening due to centrifugal force during swinging.
Solution Approach 2:
The patent creates an asymmetric attachment configuration where the first hole and second hole are positioned and oriented differently relative to each other. The fixing member engages with the weight member through this asymmetric arrangement, preventing loosening by ensuring the screw direction does not coincide with the centrifugal force direction during swinging.
3Reliability
If the center of gravity is lowered by placing a weight member in the sole portion, then the flight distance of the ball is increased, but the weight member cannot be firmly fixed to the head body
Solution Approach 1:
The fixing member is nested within the head body structure, with its first portion fitting into the first hole and its second portion engaging with the weight member. This nesting arrangement allows the weight member to be firmly fixed to the head body through a hierarchical assembly structure that is both reliable and manufacturable.
Data Source
AI summary
An iron golf club head includes a head body having a sole portion, a weight member disposed in the sole portion, and a fixing member for fixing the weight member to the head body. The head body is provided with a first hole and a second hole. The first hole opens at a bottom surface of the sole portion. The weight member is in the first hole by insertion from below the head in a first direction. The second hole opens at a surface of the head body. The fixing member is inserted into the weight member from the second hole in a second direction different from the first direction.