Knock-out Sleeve Longitudinal Ribs for Installation Pipe Misinsertion
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Solution Overview
Problem
Existing installation parts for electrotechnical purposes, such as installation boxes for concrete construction, often lead to incorrect installations due to the lack of clear differentiation between knock-out sleeves and installation pipes, resulting in improper usage and potential damage during injection molding processes.
Innovation Solution
Incorporating longitudinal ribs on the knock-out sleeve to prevent incorrect insertion of installation pipes and providing additional features like insertion depth limiting stops and tie projections to assist in correct installation and pipe positioning, ensuring proper usage and enhanced injection molding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a knock-out sleeve is provided without additional features, then the injection molding process is simple and fast, but incorrect installation occurs when users slide installation pipes onto the sleeve instead of knocking it out
Solution Approach 1:
The knock-out sleeve is designed with longitudinal ribs that create an asymmetric profile. This asymmetric structure prevents symmetric insertion of installation pipes, as the ribs protrude radially beyond the sleeve surface to a extent that blocks pipe insertion while allowing hammer access to the flat end face for knocking out the sleeve.
Solution Approach 2:
The knock-out sleeve has different surface characteristics at different locations: the lateral surface has protruding longitudinal ribs that prevent pipe insertion, while the end face has a flat surface that accepts hammer blows for knocking out. This local differentiation of surface properties enables the sleeve to simultaneously prevent incorrect installation and allow correct removal.
2Reliability
If longitudinal ribs are added to the knock-out sleeve to prevent incorrect installation, then installation correctness improves, but the injection cycle may be delayed due to unfavorable cooling
Solution Approach 1:
The longitudinal ribs are designed to run continuously from the opening of the knock-out sleeve to the knock-out wall part, ensuring that the cooling effect is established early in the injection molding process. This preliminary structuring of the cooling paths allows efficient heat dissipation throughout the rib structures, preventing injection cycle delays.
3Productivity
If the longitudinal ribs are molded onto the knock-out sleeve, then the ribs provide better cooling during injection molding, but the ribs may interfere with the knocking out process
Solution Approach 1:
The longitudinal ribs are segmented into discrete structures that are molded onto the knock-out sleeve. These segmented ribs provide cooling surfaces during injection molding but are positioned and sized such that they do not interfere with the knocking out process, as the flat end face of the sleeve remains accessible to hammer blows.
4Manufacturing precision
If no insertion depth limiting means are provided, then the device structure remains simple, but installation pipes with smaller diameter may be inserted too far into the installation part
Solution Approach 1:
The holding means are designed to automatically engage with installation pipes of smaller diameter at predetermined breaking points. This self-engaging mechanism provides insertion depth control without requiring additional active components or complex control systems, as the structural design itself enforces the depth limitation.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The part (1) has a hollow-cylindrical support (2) provided at walls (5, 6), where the support is provided for insertion of curved installation pipes. A deflection sleeve (8) is provided with two longitudinal ribs (9). The longitudinal ribs are projected around a measure radially from the stop sleeve such that the plugging of the installation pipes is prevented on the deflection sleeve. A retaining unit is connected with a wall part (7) via a predetermined breaking point. The installation pipes are provided with a diameter dimension of 20 millimeters to 25 millimeters.