Fastening Device with Pre-positioned Contact Edge for Minimal Insertion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for fastening add-on parts to carrier parts require a significant insertion distance for the blocking pin to secure the locking projections, making handling and detachment cumbersome.
Innovation Solution
The device features a configuration where the blocking pin assumes its blocking position after a very small insertion distance, facilitated by a rivet pin with a beveled centering head and radially protruding contact edge, and a blocking pin with a radially protruding contact edge that engages with the rivet pin's contact edge, ensuring secure locking with minimal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blocking pin is pushed in almost to the end of the pin receiving shaft for secure blocking, then the locking projections are reliably blocked, but the insertion distance is large making handling cumbersome
Solution Approach 1:
The contact edge on the rivet pin is positioned in advance to engage with the blocking pin at a specific location within the pin receiving shaft. This preliminary positioning ensures that the blocking action occurs at the correct depth without requiring the blocking pin to be inserted to the very end, thus maintaining reliability while reducing insertion distance
Solution Approach 2:
The contact edge on the rivet pin acts as an intermediary element that transfers the blocking action to the blocking pin at the optimal location. This intermediary feature enables reliable blocking to be achieved with a smaller insertion distance by mediating the interaction between the blocking pin and the internal structure of the pin receiving shaft
2Reliability
If the blocking pin is pushed in almost to the end of the pin receiving shaft for secure blocking, then the locking projections are reliably blocked, but the insertion distance is large affecting assembly efficiency
Solution Approach 1:
The contact edge is pre-positioned on the rivet pin to enable the blocking pin to engage at the correct depth during assembly. This preliminary arrangement ensures reliable blocking is achieved with minimal insertion distance, significantly improving assembly efficiency without compromising blocking reliability
Solution Approach 2:
The invention changes the geometric parameter of the pin receiving shaft by providing a contact edge at a specific location. This parameter change allows the blocking pin to achieve secure blocking with a reduced insertion distance, directly improving assembly speed and productivity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A device for fastening an attachment (4) to a support part (18) has a bearing part (1) which can be connected to the attachment (4) via connecting means (2), a rivet pin (8) displaceably mounted in a riveting recess (7) of the support part (1) between a preassembly position and a final assembly position and having laterally protruding latching projections (15) and a pin mounting shank (12), wherein the latching projections (15) engage behind the support part (18) in the final assembly position, and a locking pin (13) displaceably mounted in the pin mounting shank (12) between a release position and a locking position, wherein the locking pin (13) locks a radial movement of the latching projections (15) in the locking position. As a result, the attachment (4), in a manner pre-oriented with regard to the support part (18), can be connected to the support part (18) in the final assembly position of the rivet pin (8) before a final connection is effected by pushing the locking pin (13) into the locking position.