Stamp Handle Assembly with Ball Joint and Extending Grip
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Solution Overview
Problem
Conventional stamp handles often lead to wrist injuries due to the formation of a 90-degree angle between the palm and arm, causing users to apply strong force, which can result in wrist strain, especially for those using the stamp continuously. Additionally, extending handles are prone to detachment under force or misalignment, increasing injury risk.
Innovation Solution
A handle assembly featuring a knob body with a bowl-shaped head, central post, and fixing seat, combined with an extending handle having a ball joint, collar, and fixing plate, providing a stable engagement mechanism that allows users to grasp laterally and reduces the risk of detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extending handle is mounted on the knob body using a slot and hook engagement, then the holding area of the stamp handle is increased allowing lateral grasping, but the slot and hook are unfirmly engaged and will be detached easily by large pressing force or deviated pressing force
Solution Approach 1:
The patent employs a spherical engagement interface where the hook is formed as a spherical protrusion that fits into a corresponding spherical recess in the slot. This spherical geometry provides continuous surface contact and allows for self-centering, preventing easy detachment while maintaining smooth lateral grasping operation.
Solution Approach 2:
The patent adds a dimensional constraint by forming the slot with side walls that extend laterally to engage with the hook. This creates engagement in multiple dimensions (vertical slot depth plus lateral side wall contact) rather than a simple single-plane hook-and-slot connection, significantly increasing resistance to detachment forces.
2Ease of operation
If the user grasps on the top of the handle knob with the palm, then the stamp can be pressed, but an angle nearly 90 degrees is formed between the palm and the arm causing wrist injury
Solution Approach 1:
The patent extends the handle in a lateral direction perpendicular to the original vertical axis, creating a new grasping dimension. This allows the user's arm to remain in a more natural, aligned position while grasping the extended portion, eliminating the 90-degree wrist angle and associated injury risk.
Data Source
AI summary
A handle assembly adapted to be mounted on a driving member of a stamp has a knob body and an extending portion. The knob body has a bowl-shaped head, a central post, and a fixing seat. The extending portion has a ball joint, a collar, and a fixing plate. The ball joint is engaged with and encloses the bowl-shaped head, the collar surrounds the central post, and the fixing plate is mounted in a slot of the fixing seat. The extending handle is mounted on a top of the knob body firmly by the engagement between the ball joint and the bowl-shaped head.