Foldable Handle for Hand Pump with Rotating Piston Rod
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Solution Overview
Problem
Conventional hand pumps and air pumps occupy excessive space due to unfolded stands and handles, and their collapsible designs are often unbalanced, making them inefficient for user operation and storage.
Innovation Solution
A hand pump design featuring a foldable and collapsible handle with a guiding passage and stud system that allows the piston rod to be rotated between inward and outward positions, enabling stable and effective operation while allowing for compact folding, and includes a control ferrule for secure anchoring of the piston rod to the handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the handle is made foldable to reduce storage space, then the volume for storage is reduced, but the handle becomes unbalanced and off-center during operation
Solution Approach 1:
The handle is designed with a pivot shaft that allows it to dynamically change its position between a folded state for compact storage and an unfolded state for operation. The handle can be rotated about the pivot shaft to achieve different configurations, enabling it to adapt between storage and operational requirements.
Solution Approach 2:
The handle is divided into multiple segments including a first handle portion, a second handle portion, and a pivot shaft. This segmentation allows each part to move independently relative to others, enabling the handle to fold compactly while maintaining proper balance during operation through the coordinated movement of segments.
2Volume of moving object
If the handle is folded compactly for storage, then the overall size is reduced, but the handle may not be solidly and effectively actuated during operation
Solution Approach 1:
The control ferrule provides dynamic locking capability that secures the piston rod to the handle in the unfolded operational position. This ensures that during operation, the handle and piston rod remain firmly connected and balanced, providing reliable and stable actuation while still allowing compact folding when the ferrule is released.
Solution Approach 2:
The control ferrule acts as an intermediary component that mediates between the piston rod and the handle. It selectively connects these components during operation to ensure stable force transmission, while allowing them to separate during folding for compact storage, thus resolving the contradiction between compactness and operational reliability.
3Volume of moving object
If the piston rod is selectively engaged with the handle through a stud and slot mechanism, then the handle can fold compactly, but the mechanism complexity increases
Solution Approach 1:
The slot in the stud provides a nesting mechanism where the piston rod can be received within the handle structure when folded. The slot allows the piston rod to nest within the handle's second handle portion, enabling compact folding while using a relatively simple geometric feature rather than a complex mechanical linkage.
Data Source
AI summary
A hand pump includes a piston slidably engaged in a housing and coupled to a piston rod, a handle having a compartment for receiving the piston rod at an inwardly folding position and having a guiding passage formed in one of the two end portions of the handle, a stud extended from a middle portion of the handle and having a slot communicating with the passage of the handle for allowing the piston rod to be rotated relative to handle between the inwardly folding position and an outwardly working position where the piston rod is engaged in the stud and perpendicular to the handle, and a control ferrule is attached onto the piston rod for anchoring the piston rod to the housing at the outwardly working position.