Grease Gun Annular Sealing and Movable Support for Cartridge Versatility
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Solution Overview
Problem
Existing grease guns are limited in versatility, as they often require specific cartridge lengths and designs for proper operation, and lack flexibility in using different brands or types of cartridges.
Innovation Solution
The grease gun features an annular sealing surface on the press head that accommodates cartridges of varying lengths, along with an integrated follow-up piston and a detachable piston rod with an acute tip, allowing for secure sealing and operation with different cartridge designs, including those without pre-perforated brake points, and a connector with an annular collar for gas-tight coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed-length cartridge is used with a specific support position, then proper sealing is achieved, but versatility with different cartridge lengths is lost
Solution Approach 1:
The support is made movable along the barrel axis, allowing it to dynamically adjust its position according to the length of the inserted cartridge. This dynamic adjustment enables the support to maintain proper sealing contact regardless of cartridge length variations, resolving the contradiction between sealing reliability and cartridge compatibility.
Solution Approach 2:
The position parameter of the support is made variable rather than fixed. By allowing the support to move to different positions along the barrel, the system can adapt to different cartridge lengths while maintaining the required sealing parameters, thus achieving both reliable sealing and versatility.
2Reliability
If a smooth sealing surface is required on the cartridge, then sealing is improved, but cartridges with interrupted or non-smooth surfaces cannot be used
Solution Approach 1:
The annular collar acts as an intermediary sealing element between the press head and the cartridge. Instead of requiring a smooth sealing surface on the cartridge itself, the collar provides the sealing function by engaging with the cartridge shoulder, thereby enabling sealing with cartridges that have interrupted or non-smooth surfaces.
Solution Approach 2:
The annular collar is a simple, replaceable component that can be easily manufactured and replaced if needed. This simple structure allows for versatile cartridge designs without requiring complex sealing surfaces on disposable cartridges.
3Device complexity
If the piston rod remains integrated, then structural simplicity is maintained, but it interferes with cartridge operation
Solution Approach 1:
The piston rod is made detachable rather than permanently integrated. It can be removed when a cartridge is being used and reattached when needed, allowing the system to switch between configurations to avoid interference with cartridge operation while maintaining structural simplicity when the rod is attached.
Solution Approach 2:
The piston rod is separated from the main body as a detachable component. This segmentation allows the piston rod to be removed when not needed, eliminating interference with cartridge insertion and operation, while still providing structural simplicity when attached.
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
Enables the use of various cartridge lengths and designs, ensuring consistent sealing and efficient grease dispensing, even with non-smooth or interrupted sealing surfaces, enhancing the versatility and adaptability of the grease gun.
Implementation Method 1
a spring which biases the cartridge against the press head and is provided between the support and the rear end of the cartridge
Implementation Method 2
the piston rod has an acute tip, so that the piston rod may pierce the follow-up piston of the cartridge
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A grease gun having a press head (12), a barrel (14) detachably coupled to the press head, a connector (26) formed at the press head for connecting a cartridge (18) that is accommodated in the barrel (14), and a support (28) for supporting the cartridge (14), the support being formed at the barrel in a rear end portion facing away from the press head (12), wherein a spring (30) which biases the cartridge against the press head (12) is provided between the support (28) and the rear end of the cartridge (18).