Reinforced Clamping Element for Document Holders
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Solution Overview
Problem
Existing document holders with plastic clamping elements have limited elasticity, leading to irreversible widening of the clamping gap when thick documents are inserted, resulting in an inability to clamp thinner stacks of papers effectively.
Innovation Solution
The clamping element is reinforced with a central area of increased thickness and an elastic sheet metal clamping spring, or a one-piece plastic design with thicker central and thinner end sections, allowing for enhanced clamping force and elasticity to accommodate varying document quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the clamping element is made from one-piece plastic, then the manufacturing is simple and cost-effective, but the elasticity is limited and the clamping gap cannot be recovered after widening
Solution Approach 1:
The clamping element combines plastic and metal materials to create a composite structure. The plastic base body provides manufacturing simplicity and cost-effectiveness, while the integrated metal clamping spring provides the necessary elasticity and restoring force. This composite approach resolves the contradiction by allowing the clamping element to be manufactured as a single integrated piece while incorporating two different materials with complementary properties.
Solution Approach 2:
The clamping element features non-uniform thickness distribution with a thicker middle area and thinner end areas. This local quality variation allows the middle section to provide enhanced clamping force while the thinner end areas maintain flexibility and elasticity. The differentiated thickness profile enables the structure to achieve both strength where needed and elasticity where required, resolving the contradiction between manufacturing simplicity and clamping reliability.
2Adaptability or versatility
If the clamping gap is widened to accommodate thick documents, then the capacity increases, but the elasticity is lost and thin documents cannot be clamped effectively
Solution Approach 1:
The clamping element incorporates a metal spring that changes its elastic parameters dynamically. When thick documents are inserted and the gap widens, the spring compresses and stores energy. When thin documents are inserted, the spring maintains appropriate tension. This parameter change capability allows the same clamping element to effectively clamp both thick and thin document stacks, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The clamping element transitions from a static plastic structure to a dynamic system with an integrated metal spring. The spring provides dynamic adjustment capability, automatically adapting the clamping force to match the thickness of inserted documents. This dynamic behavior enables the clamping element to maintain effective clamping across varying document quantities, resolving the contradiction between capacity and clamping effectiveness.
3Force
If the clamping element has increased thickness in the middle area, then the clamping force increases, but the overall elasticity may be reduced
Solution Approach 1:
The clamping element features non-uniform thickness distribution with a thicker middle area and thinner end areas. This local quality variation allows the middle section to provide enhanced clamping force while the thinner end areas maintain flexibility and elasticity. The differentiated thickness profile enables the structure to achieve both strength where needed and elasticity where required, resolving the contradiction between manufacturing simplicity and clamping reliability.
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 reinforced design provides a stronger clamping effect, enabling the holder to securely clamp both thick and thin stacks of documents, maintaining the ability to clamp smaller quantities after expansion, while preventing slipping and ensuring easy grip and operation.
Implementation Method 1
the clamping spring is made of elastic sheet metal... As the clamping spring grips the base body, it applies the force required for the clamping effect
Implementation Method 2
The thick central area creates a high clamping force, so that larger quantities of documents can also be clamped. While the middle area is susceptible to plastic expansion due to its thickness
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The sheath has a clamping element (22) whose clamping section (32) is arranged on or over an inner side of a rear cover turned towards a front cover. A base section (30) and the clamping section are movable against each other for enlarging a gap (38) against elastic reset force. The element is movably fastened to the covers and movable in a release position in which the clamping section is partially withdrawn from the rear cover. The element has a middle area (52) reinforced opposite to end areas (50) in a longitudinal direction running parallel to a side edge of the rear cover.