Paper Punch Internal Pivot and Pressure Bolt Attachment
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Solution Overview
Problem
Existing paper punches have a design that is perceived as less attractive due to the visible and bulky attachment of the pivot axis and pressure bolts, which affects their aesthetic appeal.
Innovation Solution
The paper punch design features a pivot axis that runs through internal connecting elements, such as pivot pins or a telescoping pivot rod, which are attached to the inside of the side walls, and pressure bolts that are also internally attached, making them invisible from the outside, enhancing the smooth and uniform appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pivot axis and pressure bolts are attached externally with thickened ends engaging behind side walls, then the structural stability and reliability are improved, but the design appearance becomes less attractive due to visible and bulky attachment elements
Solution Approach 1:
The patent extracts the attachment elements (pivot axis and pressure bolts) from the external visible area and relocates them to the internal structure. The connecting elements are now attached only to the inside of the side walls, making them invisible from the outside while maintaining their structural function. This resolves the contradiction by separating the structural support function from the aesthetic appearance function.
Solution Approach 2:
The patent implements nesting by placing the connecting elements (pivot axis and pressure bolts) inside the cover part structure. The pivot axis runs through connecting elements that are nested within the side walls, and pressure bolts are nested between the side walls, creating a clean external appearance while maintaining internal structural integrity.
2Strength
If the pivot axis extends to the outside of side walls for stable attachment, then the mechanical connection is strengthened, but the surface smoothness and color uniformity are compromised due to visible attachment points
Solution Approach 1:
The patent removes the visible portion of the pivot axis from the external area and relocates it entirely inside the cover part. The pivot axis now runs through connecting elements that are attached only to the inside of the side walls, eliminating any external visible attachment points and restoring surface smoothness while maintaining the mechanical connection strength through proper internal positioning.
3Reliability
If pressure bolts are passed through side walls with thickened ends for secure engagement, then the attachment reliability is improved, but the design complexity increases due to additional external components
Solution Approach 1:
The patent extracts the pressure bolts from the external attachment configuration and relocates them entirely inside the cover part. The pressure bolts are now attached only to the inside of the side walls, eliminating the need for external thickened ends and reducing design complexity while maintaining secure engagement through internal positioning and spring pressure.
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
The new design provides a more aesthetically pleasing paper punch with improved internal structural stability and reduced visibility of the pivot and pressure mechanisms, enhancing user experience and packaging efficiency.
Implementation Method 1
a telescoping pivot rod, which is rotatably mounted in both bearing blocks and is pressed against the inner sides of the side walls by the force of a compression spring accommodated in it
Implementation Method 2
The pivot pins are welded to the insides of the side walls, again preferably by means of a butt welding process
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention relates to a paper punch (10, 110) with a lower part (12) and with a pressure lever (24) pivotably mounted on lateral bearing blocks (22) of the lower part (12), the pressure lever (24) acting against the restoring force of a spring (34) on hole tools (33) slidably mounted on the lower part (12), wherein the pressure lever (24) has a cover part (26) pivotably connected to the bearing blocks (22) on downwardly projecting side cheeks (28) and two pressure bolts (32) for actuating each of the hole tools (33), and wherein the pressure bolts (32) are each attached at a first end (36) to a fastening tongue (40) projecting downwards from the cover part (26) at a distance from one of the side cheeks (28). According to the invention, the pressure bolts (32) are each attached with a second end (46) to the respective side wall (28) on its inner side (48) facing the other side wall (28).