Riveting Device With Deformable Internal Rivet
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Solution Overview
Problem
Existing riveting devices for hand tools, such as pliers, face challenges in ensuring precise articulation and preventing relative movement of working members, leading to costly and time-consuming reworking of cutting parts, and are difficult to automate due to complex manufacturing and lack of control over clamping and insertion processes.
Innovation Solution
A riveting device comprising a non-deformable external rivet with a tubular body and a deformable internal rivet, where the external rivet has a lip and the internal rivet has a flange, allowing for controlled crimping and precise assembly without deformation of the external rivet, ensuring no relative movement and allowing for definitive machining before assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a deformable external rivet is used to enable clamping between rivets, then assembly is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
Instead of making the external rivet deformable to achieve clamping, the invention inverts the approach by making the internal rivet deformable while keeping the external rivet simple and rigid. The deformable internal rivet crimps against the rigid external rivet to create the clamping effect, thereby resolving the contradiction between assembly capability and manufacturing complexity.
Solution Approach 2:
The invention introduces an intermediary element (the deformable internal rivet) that mediates between the simple external rivet and the arms to be assembled. This internal rivet performs the deformation and clamping function, allowing the external rivet to remain simple and easy to manufacture while still achieving the desired assembly capability.
2Ease of manufacture
If clamping occurs inside the bores of the arms, then riveting is achieved, but control over the clamping process is lost
Solution Approach 1:
The invention moves the clamping action from the internal dimension (inside the bores) to the external dimension. The internal rivet deforms and crimps against the external rivet, which is positioned outside or at the entrance of the bores. This dimensional shift allows visual and tactile control of the clamping process while maintaining riveting capability.
3Ease of manufacture
If the external rivet is deformable to enable crimping, then assembly is achieved, but the external rivet deformation complicates the manufacturing process
Solution Approach 1:
The invention inverts which rivet performs the deformation function. Instead of the external rivet being deformable, the internal rivet is made deformable while the external rivet remains rigid. This inversion allows crimping capability to be achieved while keeping the external rivet manufacturing process simple and straightforward.
4Reliability
If a complex external rivet with core is used, then riveting function is achieved, but production cost increases
Solution Approach 1:
The invention uses a simple, inexpensive external rivet that does not require complex manufacturing. The functional complexity is transferred to the internal rivet, allowing the external component to be produced cheaply and simply, thereby reducing overall production costs while maintaining riveting function.
Solution Approach 2:
By inverting which rivet is complex and which is simple, the invention achieves reliable riveting function through the deformable internal rivet while keeping the external rivet simple and cheap to produce, thereby resolving the contradiction between functionality and production cost.
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 solution provides a precise and reliable assembly of hand tool arms, eliminating the need for reworking and enabling automated manufacturing by ensuring no relative movement and maintaining the integrity of the external rivet, thus simplifying the manufacturing process and reducing costs.
Implementation Method 1
the cylindrical body of the internal rivet is deformable in order to crimp the internal rivet on said external rivet
Data Source
AI summary
A riveting device for mutual assembly of two parts each including a bore, where the device includes a non-deformable external rivet having a tubular body suitable for being inserted into said bores and provided on one of the longitudinal ends thereof with a lip, and an internal rivet having a solid deformable cylindrical body and issuing substantially perpendicular from a flange, said tubular body having an external diameter slightly less than the diameter of said bores and a length D between the rear face of the lip thereof and the opposite end thereof at most equal to the sum of the thicknesses of the parts, said cylindrical body having an external homothetic transverse cross-section slightly less than the internal transverse cross-section of the tubular body, and a length slightly greater than that of the tubular body.