Pressing Device Bolt Fixing via Non-Releasable Locking
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Solution Overview
Problem
Existing pressing devices for radial pressing, particularly of pipe fittings, face issues with incorrect pressing due to varying wear levels of levers, leading to leaky connections and safety risks from broken tool parts, as users often incorrectly replace levers during assembly.
Innovation Solution
A pressing device with a non-releasable securing element that prevents axial displacement of the bolt, ensuring the bolt is securely fixed within the device, thereby preventing incorrect assembly and ensuring safety by making the device tamper-proof and preventing accidental opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If releasable locking rings are used to hold the bolt in the press jaw carrier, then the bolt can be replaced or adjusted, but incorrect pressing occurs due to different wear and tear of pressing levers which cannot be recognized visually
Solution Approach 1:
Instead of allowing the bolt to be easily replaceable (releasable locking rings), the invention inverts the approach by making the bolt permanently fixed with non-releasable securing elements. This prevents the substitution of worn pressing levers and ensures consistent pressing accuracy, sacrificing replaceability for reliability.
2Ease of operation
If releasable locking rings are used to hold the bolt, then the pressing lever can be swapped, but parts of the tool can break off and fly away like projectiles during pressing due to prevailing forces
Solution Approach 1:
The invention inverts the conventional approach by using non-releasable securing elements instead of releasable locking rings. This permanently secures the bolt and pressing lever assembly, eliminating the risk of parts breaking off and becoming projectiles, while sacrificing assembly flexibility.
Solution Approach 2:
The non-releasable securing elements act as a preventive measure beforehand, securing the bolt in a way that prevents catastrophic failure. By designing the securing elements to fail in a controlled manner (deforming the bolt end) rather than allowing sudden breakage, the invention cushions against the harmful effect of projectile formation.
3Reliability
If a non-releasable securing element is used to prevent bolt displacement, then safety is enhanced by preventing incorrect assembly, but the device complexity increases due to the additional securing mechanism
Solution Approach 1:
The securing element performs a dual function: it secures the bolt against axial displacement and simultaneously deforms the bolt end to create a self-locking mechanism. The bolt end deformation serves both as the securing method and as a visual indicator of proper assembly, reducing the need for additional complex securing mechanisms.
Data Source
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AI summary
A pressing device (1, 1', 1") comprises at least one support element (2) with at least one support opening (3, 3'), and at least one pressing element (5, 5') with at least one bearing opening (6, 6') for applying a pressing force to a pressing piece, wherein the at least one pressing element (5, 5') is pivotably mounted on the support element (2) about at least one pivot axis (A1, A2), and wherein a bolt (8, 8') providing the bearing and the pivot axis (A1, A2) extends through the at least one support opening (3, 3') and the bearing opening (6, 6'). The bolt (8, 8') is secured at its end by a non-releasable locking element (11, 11'; 12, 12'; 13, 13') against axial displacement relative to the support element (2) in the bearing opening (6, 6') and the support opening (3, 3').