Hand Air Pump Handle Assembly with Nested Collapsible Rod
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Solution Overview
Problem
Conventional hand air pumps cause discomfort and risk of injury due to the user's hand touching notches during operation and fail to eliminate accidental jamming.
Innovation Solution
An operating handle assembly with a handgrip unit and a pivotally connected pumping rod unit, allowing the pumping rod to be biased relative to the handgrip, featuring a smooth cylindrical grip body without notches and stop edges to secure the rod, enabling comfortable and safe operation while allowing for compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pumping rod unit is biased relative to the handgrip unit to reduce length, then the hand air pump can be collapsed for compact storage, but the user's hand may be injured due to contact with notches or the pumping rod
Solution Approach 1:
The pumping rod unit is nested within the handgrip unit when collapsed, with the pumping rod inserted into a receiving cavity of the handgrip. This nesting arrangement allows compact storage while isolating the pumping rod from user contact, eliminating the injury risk associated with exposed notches or rods during collapse.
Solution Approach 2:
The harmful notches are completely removed from the handgrip structure. Instead of using notches to enable biasing motion, the patent employs a smooth cylindrical handgrip with a receiving cavity that safely contains the pumping rod during collapse, extracting the dangerous geometric feature while preserving the collapsing function.
2Ease of operation
If notches are provided on the handgrip unit to allow biasing of the pumping rod, then the pumping rod can be biased relative to the handgrip, but the user's hand touches the notches causing discomfort and potential injury
Solution Approach 1:
The notches are completely removed from the handgrip structure. The patent replaces the notched design with a smooth cylindrical handgrip that has a receiving cavity, eliminating the source of hand discomfort and injury while preserving the ability to bias the pumping rod through the cavity mechanism.
Solution Approach 2:
The receiving cavity acts as an intermediary structure that enables the biasing motion of the pumping rod without requiring notches on the handgrip exterior. The cavity provides the necessary geometric clearance for biasing while maintaining a smooth, safe outer surface that does not contact the user's hand.
3Adaptability or versatility
If the handgrip unit is divided into parts by a pivot center to allow pumping rod rotation, then the pumping rod can be turned about the pivot center, but the notch location creates safety issues during grasping
Solution Approach 1:
The pumping rod unit is nested within the handgrip unit's receiving cavity, allowing the pumping rod to rotate about the pivot center while remaining contained within the safe interior space. This nesting prevents the pumping rod from exposing sharp edges or notches to the user's hand during rotation and grasping operations.
Data Source
AI summary
An operating handle assembly used with a pump to constitute a hand air pump is disclosed, including a handgrip unit having a handgrip and a pivot, and a pumping rod unit pivotally connected to the handgrip unit and turnable about a pivot center relative to the handgrip unit. The pumping rod unit includes a pivot pivotally located at the pivot of the handgrip, and a piston rod coupled to a piston hole of the pump and axially movable relative to the pump between a received position and a first extended position and turnable about the pivot center within a predetermined angle between the first extended position and a second extended position when the piston rod reaches the first extended position.