Pipe Screw Mounting System Spacer Body Assembly Path
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Solution Overview
Problem
In pipe fittings with cutting rings, the pre-assembly end position is not reliably defined due to a lack of recognizable force increase, making it difficult to determine when further cutting is needed for final assembly to compensate for tolerances.
Innovation Solution
An extended pre-assembly tool with a spacer body creates a defined assembly path during pre-assembly, allowing for a block stop of the cutting ring, enabling further cutting during final assembly and accommodating tolerance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no spacer body is used during pre-assembly, then the assembly process is simpler, but the pre-assembly end position is not reliably defined
Solution Approach 1:
The spacer body acts as an intermediary element between the pre-assembly tool and the cutting ring, providing a defined mechanical stop that reliably indicates the pre-assembly end position. This mediator component translates the abstract concept of 'correct assembly depth' into a tangible, detectable mechanical event (the stop), resolving the contradiction between simplicity and precision.
2Productivity
If the cutting ring is pre-assembled without a defined stop, then the pre-assembly process is faster, but further cutting during final assembly cannot be reliably initiated
Solution Approach 1:
The spacer body enables preliminary action by establishing a defined pre-assembly end position that prepares the cutting ring for subsequent final assembly. The mechanical stop creates a reproducible starting point for the cutting operation, ensuring that when final assembly begins, the cutting ring is positioned correctly relative to the pipe, thus enabling reliable cutting initiation while maintaining efficient pre-assembly.
3Measurement precision
If a spacer body is added to define the assembly path, then the pre-assembly end position is clearly defined, but the device complexity increases
Solution Approach 1:
The assembly system is segmented into distinct functional components: the pre-assembly tool, the spacer body, and the cutting ring assembly. This segmentation allows the spacer body to be a separate, simple component that can be easily attached to the pre-assembly tool, providing the necessary precision without significantly increasing overall system complexity. The modular approach enables the precision function to be added independently.
Data Source
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Figure 3~4
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AI summary
The present invention relates to a mounting system for a pipe screw connection having a cutting ring, consisting of at least one connection stub (1) having a bore (2), having an inner cone (4) which is at the front in the plug-in direction (E) of a pipe (3) to be connected and has an inner narrowed end, and a union nut (9), to be pushed onto the pipe (3) to be connected, having an inner thread (13) in its through-passage opening (10), and also having a cutting ring (15), arranged between the connection stub (1) and the union nut (9) on the pipe (3) to be connected, having at least one cutting edge (15a) with an outer contour (17) facing the inner cone (4). Formed at the rear end, in the plug-in direction (E), of the outer contour (17), is a circumferential stop (20, 21). For preliminary mounting of the cutting ring (15) on the pipe (3), an annular spacer (23), circumferentially enclosing the cutting ring (15), is arranged between the circumferential stop (20) of the cutting ring (15) and a front end, as seen in the plug-in direction (E), of the connection stub (1), the width (Y) of said annular spacer (23) allowing an axial displacement travel between the connection stub (1) and the cutting ring (15), the union nut (9) covering said displacement travel during final mounting of the cutting ring (15) in the pipe screw connection, beyond a point of a perceptible rise in force of a tightening force to be applied during the preliminary mounting. During the preliminary mounting of the cutting ring (15) on the pipe (3), after the outer contour (17) has been introduced into the inner cone (4) as far as mutual abutment of the outer contour (17) against the inner cone (4) and of the union nut (9) against the cutting ring (15), the union nut (9) and the connection stub (1) are axially displaceable in relation to one another about a tightening travel (X) such that the cutting edge (15a) can penetrate into the pipe (3) in such a way that the cutting edge (15a) penetrates to a depth of at least 0.1 mm, and at the end of the tightening travel (X), the connection stub (1) butts against the abutment surface (21) of the cutting ring (15) by means of the spacer (23), such that the point of the marked rise in the tightening force is produced on account of the mutual abutment.