Spring Actuated Stapler High-Start Design and Safety Lock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high-start spring actuated staplers suffer from inefficiencies due to wasted energy from handle pressing, lack of precise timing in staple ejection, and safety concerns when used as tackers, as they often kick back, preventing effective stapling and potentially causing accidents.
Innovation Solution
A high-start, spring-actuated stapler design with a separately movable spring/cage subassembly for pre-loading the power spring, combined with a lever mechanism for enhanced leverage and a release mechanism using a pivotably attached latch to ensure precise and low-friction staple ejection, along with a safety lock to prevent accidental firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional high-start design uses a power spring driven directly by the handle, then the mechanism can eject staples, but energy is wasted due to lack of preloading and the mechanism cannot achieve precise timing
Solution Approach 1:
The power spring is preloaded to a predetermined position before the firing action occurs. The handle presses against the power spring to deflect it and store energy, and a latch holds the spring in this preloaded state until firing is initiated, ensuring energy is available and timing is precise when the staple is ejected
Solution Approach 2:
The mechanism is divided into separate functional components: a power spring for energy storage, a latch for holding the preloaded state, a striker for staple ejection, and a release mechanism triggered by the base. This segmentation allows each component to perform its specific function efficiently, improving overall energy utilization
2Ease of operation
If the handle is spaced above the housing at release position, then the mechanism can reset, but the housing kicks back and prevents effective stapling
Solution Approach 1:
The mechanism incorporates a trigger-based release system where the base must be pressed to initiate firing. The latch releases the striker only when the trigger is activated, providing feedback control that ensures the housing is properly positioned and prevents premature or mistimed staple ejection that would cause kickback
Solution Approach 2:
The latch acts as an intermediary between the preloaded power spring and the striker. It holds the spring in the preloaded state and only releases energy when properly triggered, mediating the energy transfer to ensure precise timing and prevent housing kickback
3Object-affected harmful factors
If the base is designed to prevent pivoting away, then safety is improved, but the stapler cannot be used as a tacker
Solution Approach 1:
The base is designed to be pivotable relative to the housing, allowing it to assume different positions. When pivoted away, the trigger mechanism prevents staple ejection, providing safety. When returned to the engaged position, full functionality is restored, enabling use as a tacker. This dynamic design allows the mechanism to adapt to different operational modes
4Ease of operation
If a release latch is positioned behind the striker and delinked by direct pressing force, then the mechanism can reset, but friction is not minimized and timing is not precise
Solution Approach 1:
The latch is positioned to engage the power spring directly rather than the striker, acting as an intermediary that delinks the spring from the firing mechanism. This allows the latch to be actuated by minimal force through the trigger, minimizing friction losses and energy waste while maintaining precise control over the release timing
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 minimizes energy wastage, achieves precise staple ejection, and allows safe use as a tacker by reducing kickback, enabling efficient stapling with lower user force and enhanced safety features.
Implementation Method 1
A power spring is deflected to store energy by the motion of the handle. At a predetermined position of the handle, the striker is released to accelerate to the lower-most position by urging of the power spring.
Implementation Method 2
a lever mechanism for enhanced leverage
Implementation Method 3
the striker and the power spring are lifted by a reset spring to the initial rest position
Data Source
Figure 1~2
Figure 3~10
Figure 11~14
AI summary
A spring energized stapler includes a "high-start" design wherein a striker has an initial rest position above the staple track. A handle is pressed to energize a power spring while the striker remains stationary. At a predetermined position of the handle, the striker is released to eject a staple. A subassembly of a cage and the power spring provides a preload to the power spring in the rest position. The subassembly is separately movable from the handle to allow a handle pressing end to move farther than a cage front end travel distance. A lever links the striker to the power spring to provide leverage upon the power spring. The lever and cage/spring subassembly are nested in a compact assembly. A safety lock includes a two step action to restrict motion of the striker, and fits a notch in a bottom of the striker.