Paper Punch With Gripping Cutout For One-Handed Operation
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Solution Overview
Problem
Existing paper punches require significant upper body strength and often necessitate the use of both hands to operate, making them cumbersome and difficult for users with smaller hands or those needing to exert strength in punching processes.
Innovation Solution
The paper punch features a gripping cutout in the base part with a height of at least 10 mm and a width of at least 70 mm, allowing users to easily insert fingers and grip the hand lever with their thumb, enabling one-handed operation and accommodating users with smaller hands, while the base part can remain on a tabletop for enhanced stability and strength distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the base rests entirely on the table, then the paper punch is stable during operation, but both hands are required to lift the punch making it difficult to handle
Solution Approach 1:
The base is segmented by introducing a gripping recess that divides the base structure into functional zones: a stable base portion for table contact and a gripping portion for hand insertion. This segmentation allows the base to simultaneously provide stability when resting on the table and ease of handling when gripped by the user.
2Ease of operation
If the user presses down the free end of the hand lever, then the punching tools are actuated, but considerable force is required due to the long lever arm
Solution Approach 1:
The gripping recess acts as an intermediary element between the user's hand and the base. By inserting fingers into the recess, the user creates a mechanical advantage that reduces the effort needed to actuate the punching tools, mediating the force transmission more efficiently than direct hand pressure on the lever end.
3Force
If the user holds the paper punch in the hand, then the muscles of the hand and forearm are engaged allowing significant force, but both hands are usually required to lift the punch
Solution Approach 1:
The gripping recess is designed with specific local dimensions (width of at least 70 mm, height of at least 10 mm) that are optimized for finger insertion. This localized structural feature enables one-handed operation by providing a comfortable grip zone that accommodates the user's fingers while maintaining the ability to exert significant force through hand and forearm muscles.
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 enhances handling ease, allowing users to efficiently punch paper using both hand and upper body muscle groups, reducing the need for excessive force and accommodating users with smaller hands by providing a comfortable and stable gripping surface.
Implementation Method 1
a hand lever (22) for actuating the punching tools (26), which is pivotably mounted about a pivot axis (20) above a front area (14) of the base (12)
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a paper punch (10), comprising a base part (12), which has a positioning surface (40) on the bottom side thereof for positioning the same on a table top, comprising at least two punching tools (26) that are displaceably supported with respect to the bottom part (12) and provided for punching holes into documents, and further comprising a hand-held lever (22) for applying pressure on the punching tools (26), said lever being supported about a pivot axis (20) in a limited pivoting manner by way of a front region (14) of the bottom part (12) having a contact surface (28) for the documents, and the free end (24) thereof extending at a distance from the base part (12) in the direction of a rear side (16) of the base part (12). The invention provides that the base part (12) has a grip cutout (44) which is open toward the rear side (16) of the base part and which is delimited toward the top by a ceiling wall (32) extending at a distance from the positioning surface (40) and toward the front by a transverse wall (52).