Knock-Type Feeding Container Linear Piston Mechanism
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Solution Overview
Problem
Conventional knock-type propelling containers are complex and limit the quantitative propulsion of liquids due to the conversion of rotational movement into forward movement through a screw conversion mechanism.
Innovation Solution
A simpler structure is introduced where a thrusting cylinder, engaged with detent and engaging-stop portions, moves forward upon knocking, propelling the medium, and returns rearward due to a biasing force, allowing for quantitative propulsion without rearward movement of the propelling member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a screw conversion mechanism is used to convert rotational movement into forward movement of the propelling member, then the liquid can be propelled quantitatively, but the device structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates the screw conversion mechanism from the system, replacing it with a direct linear motion transmission system. The propelling member is directly connected to the piston rod without intermediate conversion mechanisms, thereby simplifying the structure while maintaining quantitative propulsion control through the detent mechanism that limits the piston rod's travel distance.
Solution Approach 2:
Instead of converting rotational movement to linear movement through a screw mechanism, the invention inverts the approach by directly generating linear movement through the piston rod's reciprocating motion. The knocking force is directly transmitted to the piston rod, which moves linearly to propel the liquid, eliminating the need for rotational-to-linear conversion.
2Device complexity
If the propelling member is allowed to move rearward during the return stroke, then the structure can be simpler, but the quantitative propulsion control is lost
Solution Approach 1:
The patent segments the motion control function by introducing a detent mechanism that independently controls the rearward movement of the piston rod. The detent pawl and detent rack separate the forward propulsion phase from the return phase, allowing the propelling member to move forward freely while preventing rearward movement, thus maintaining quantitative control without excessive complexity.
Solution Approach 2:
The detent mechanism acts as an intermediary between the piston rod and the propelling member during the return stroke. It mediates the motion by allowing the piston rod to move forward while preventing it from moving rearward, ensuring that the propelling member maintains its position and the quantitative propulsion control is preserved.
3Ease of operation
If the thrusting cylinder is biased to return to its original position, then the knocking operation can be repeated, but the propelling member must be prevented from moving rearward
Solution Approach 1:
The patent merges the return force generation and motion control functions into a unified system. The coil spring provides the return force for the piston rod while the detent mechanism simultaneously controls the rearward movement limitation. This combination allows repeated knocking operations without requiring separate complex control systems for each function.
Solution Approach 2:
The detent mechanism automatically engages and disengages based on the direction of motion of the piston rod, without requiring external control. During the return stroke, the detent pawl automatically engages with the detent rack to prevent rearward movement, and during the forward stroke, it automatically disengages to allow movement, providing self-service motion control that simplifies the overall system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables quantitative propulsion of media with a simple structure by ensuring the thrusting cylinder stops at fixed intervals, allowing for controlled and consistent dispensing of the medium with each knock operation.
Implementation Method 1
a coil spring provided in the body and adapted to be capable of biasing the piston rod in the rearward direction
Implementation Method 2
first cam surface formed on the inner peripheral surface of the drive chamber and adapted to be slidingly contactable with the knock member, second cam surface formed on the outer peripheral surface of the piston rod and adapted to be slidingly contactable with the knock member
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
There is provided a knock-type propelling container having a simple structure that allows media used in the fields of cosmetics, writing, correcting, medical treatment (dental surgery), industry, etc., to be propelled by knocking a knock member of the propelling container. The propelling container comprises a body (12) storing a medium therein and having a tip end opening (12a) for allowing the medium to be propelled therefrom, a piston (22) arranged in the body (12) so as to be slid in a forward/rearward direction of the body (12) and capable of propelling the medium toward to the tip end opening, a piston rod (24) connected to the piston (22) and having a series of engaging-stop portions (24d) formed at fixed intervals in the forward/rearward direction, a knock member (20) provided at the body (12) so as to be reciprocably moved with respect to the body (12), a thrusting cylinder (28) arranged in the body (12) and always biased in a rearward direction, the thrusting cylinder (28) being adapted to be moved forward by knocking the knock member (20) and adapted to be stoppingly engaged with the engaging-stop portions (24d) so as to be rearward slippable relative to the engaging-stop portions (24d), and a detent cylinder (26) fixedly arranged in the body (12) in the forward/rearward direction and adapted to be stoppingly engaged with the engaging-stop portions (24d) so as to be rearward slippable relative to the engaging-stop portions (24d).