Variable Thrust Caulking Gun Lever Mechanism
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Solution Overview
Problem
Existing caulking guns lack a simple and effective mechanism to continuously or variably adjust the thrust output for dispensing viscous materials, often limiting their usability with materials of varying viscosities.
Innovation Solution
The caulking gun incorporates a variable lever system with a ratio bridge element that adjusts the load arm length, allowing the ratio between trigger strength and push rod thrust output to be varied continuously or between fixed values, from 1:7 to 1:25, through a sliding axle mechanism and turn button for easy adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed lever system is used in the caulking gun, then the structure is simple and reliable, but the thrust output cannot be adjusted for materials of varying viscosities
Solution Approach 1:
The patent applies the dynamics principle by making the lever system adjustable rather than fixed. The load arm length can be dynamically changed by moving the load axle along the trigger bridge, allowing the thrust output to be adapted to different material viscosities while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the parameter of load arm length to adjust the mechanical advantage ratio. By varying the position of the load axle along the trigger bridge, the effective load arm length changes, thereby adjusting the thrust output for different materials without requiring a completely different mechanism.
2Ease of operation
If a fixed ratio lever system is used, then the mechanism is simple, but it cannot accommodate continuous adjustment of thrust output
Solution Approach 1:
The system transitions from a fixed ratio to a dynamically adjustable ratio by allowing the load axle to move along the trigger bridge. This enables continuous adjustment of the thrust output according to material requirements while keeping the adjustment mechanism itself relatively simple.
Solution Approach 2:
The trigger bridge is designed with a segmented or divided structure that allows the load axle to be positioned at different locations along its length. This segmentation enables discrete or continuous adjustment of the load arm length, providing ease of operation for thrust adjustment.
3Adaptability or versatility
If the load arm length is made variable, then the thrust output can be adjusted, but the trigger mechanism becomes more complex
Solution Approach 1:
The trigger bridge serves multiple functions: it acts as the fulcrum support, provides the path for the load axle movement, and enables the variable ratio mechanism. By making the trigger bridge multi-functional, the patent achieves thrust ratio variability without proportionally increasing the overall mechanism complexity.
Solution Approach 2:
The patent merges the variable ratio mechanism with the existing trigger structure by integrating the load axle movement into the trigger bridge design. This combining approach allows thrust adjustment functionality to be incorporated without adding a completely separate complex mechanism.
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 solution enables seamless adjustment of thrust output to accommodate materials of different viscosities, providing a flexible and user-friendly operation by allowing continuous or fixed ratio adjustments, enhancing the gun's versatility and usability.
Implementation Method 1
The adjustment of the ratio bridge element changes the length of the load arm and as such the mechanical advantage of the lever system or the thrust ratio of the presented caulking gun.
Data Source
AI summary
A caulking gun for dispensing material includes a stock, a cartridge keep, a push rod longitudinally moveably mounted in the stock with one end having a plunger engaging a cartridge piston in the cartridge keep, a catch on the rod, a trigger coupled to the catch via an axle and pivoting about a pivot point, and a device for varying thrust output exerted on the rod when pressing the trigger for a given strength exerted on the trigger that allows axle displacement between at least first and second positions. The trigger has an upper part with a trigger bridge with two long holes. The thrust output varying device includes a ratio bridge element put over the trigger bridge and trigger and linked to the trigger bridge via the axle traversing the holes. By displacing the axle either between fixed values or continuously and the thrust output can be varied between fixed values or continuously.