Rotatable Vent-Control Bead for Pump Leakage Prevention
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Solution Overview
Problem
Pump dispensers face issues with leakage during shipping and transit due to venting mechanisms that allow product to drain back into the container, leading to mess and inefficiency, as the plunger locking mechanism often leaves the vent hole open, causing liquid to leak and become dislodged when unlocked.
Innovation Solution
The introduction of a rotatable body insert with a vent-control formation that engages the body cylinder, allowing for controlled sealing and unsealing of the vent path, preventing leakage by blocking or opening the vent path based on the plunger's locked or unlocked position, utilizing a radially-projecting rib or bead to create a continuous seal around the body insert and cylinder interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent hole is kept open to allow proper venting during use, then venting function is improved, but leakage during shipping and transit occurs
Solution Approach 1:
The vent path is made dynamically controllable through the rotatable body insert. The vent-control formation on the body insert can rotate to either block or open the vent path, transitioning between two functional states. This dynamic control allows the system to adapt to different operational conditions (shipping vs. usage) and resolve the contradiction between preventing leakage and enabling venting.
Solution Approach 2:
The system performs preliminary action by pre-positioning the body insert to block the vent path during shipping and transit. This preliminary blocking action prevents leakage before the dispenser is activated for use. When needed, the user can rotate the body insert to open the vent path, ensuring proper venting functionality is activated at the appropriate time.
2Ease of operation
If the plunger locking mechanism is simplified for ease of use, then ease of operation is improved, but control over vent path sealing becomes insufficient
Solution Approach 1:
The invention merges two functions into a single mechanism: the plunger locking function and the vent path sealing function. The body insert rotation simultaneously achieves both locking the plunger in position and sealing the vent path. This integration maintains ease of operation (single action) while improving reliability (dual function achievement).
Solution Approach 2:
The body insert serves multiple functions: it acts as a structural component of the pump body, provides the vent-control formation to seal or open the vent path, and engages with the plunger to provide locking functionality. This multi-functionality allows a single component to address both ease of operation and reliable vent path sealing.
3Object-generated harmful factors
If the vent path is blocked during shipping to prevent leakage, then leakage prevention is improved, but proper venting during use is compromised
Solution Approach 1:
The vent path blocking is made dynamic rather than static. The body insert can rotate to change the state of the vent path from blocked to open. During shipping, the vent path remains blocked by default. During use, the user rotates the body insert to open the vent path, ensuring proper venting functionality is restored when needed.
Solution Approach 2:
The system allows the user to self-service the venting function by rotating the body insert. The same user action that locks the plunger also opens the vent path, allowing the user to control both functions without requiring separate mechanisms or external assistance.
Data Source
AI summary
A dispenser pump has a plunger operable in a body including an outer cylinder body having a vent opening in its sidewall and a body insert fitting into the top of the body cylinder and providing an external collar through which the plunger stem operates. The body insert has a lock-down thread to lock down the plunger for shipping. The insert also has an undulating annular vent-control bead extending right round its cylindrical outer surface, engaging the cylinder wall with interference for either blocking or unblocking the vent opening, according to whether the vent-control bead lies above or below the interior vent opening, by rotation between the body cylinder and body insert. The rotation can be driven by rotation of the plunger head, which makes a catch engagement with the top of the body insert. Blocking the vent during shipping reduces leakage.