Clamping Ring Coupling for Anchor Rods
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Solution Overview
Problem
Existing coupling designs for injection drill anchors suffer from inefficiencies in transmitting axial impact energy, sealing, and manufacturing complexity, particularly during rotary percussive drilling, leading to energy loss and potential slippage under alternating axial stress.
Innovation Solution
A coupling arrangement featuring a metal clamping ring and elastic sealing rings, where the clamping ring is sandwiched between anchor rods, allowing direct axial support and efficient impact energy transmission, while the sealing rings provide a reliable seal and facilitate assembly by being deformable and form-fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central unthreaded section is provided in the coupling sleeve to prevent anchor rods from being screwed through, then the anchor rods are stopped at the center, but the thread end must be produced with a conical end or undercut which causes energy loss during rotary percussive drilling
Solution Approach 1:
A separate clamping ring is introduced as an intermediary component between the two anchor rods. This clamping ring provides the stopping function without requiring modifications to the thread structure, thereby eliminating the need for conical ends or undercuts that cause energy loss during percussive drilling.
Solution Approach 2:
The coupling device is segmented into distinct functional components: the coupling sleeve with internal threads and the separate clamping ring. This segmentation allows the clamping ring to be optimally designed for its specific function of providing a flat stopping surface without affecting the thread structure, thus preventing energy loss while maintaining the stopping function.
2Reliability
If a separate central opening leaving sealing element (O-ring) is added to achieve reliable sealing, then sealing is improved, but the sealing element is in the power flow and can lead to powerless slippage under alternating axial stress
Solution Approach 1:
The sealing function is extracted from the power transmission path. The O-ring sealing element is placed in a recess that is positioned outside the direct axial force flow between the clamping ring and anchor rods, eliminating the risk of powerless slippage while maintaining sealing effectiveness.
3Reliability
If welding an inner stop or inserting a dowel pin into the thread is attempted to prevent anchor rod penetration, then the anchor rods are stopped, but pressure transmission is limited and an undesired notch effect occurs
Solution Approach 1:
A separate clamping ring serves as an intermediary component that provides the stopping function without compromising the thread structure. This eliminates the notch effect caused by welded stops or dowel pins inserted into the thread, while maintaining full pressure transmission capability through the intact thread connection.
4Reliability
If the coupling sleeve has two threaded ends offset by half a turn to prevent anchor rod penetration, then penetration is limited, but pressure and impact transmission is only possible via the thread which is perceived as disadvantageous
Solution Approach 1:
A separate clamping ring acts as an intermediary that provides the penetration prevention function independently of the thread structure. This allows the threads to be optimized solely for force transmission without the compromise of offset threading, enabling efficient direct transmission of pressure and impact forces through the thread-clamping ring-anchor rod path.
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 enables low-loss axial impact energy transmission, improved sealing, and simplified assembly, maintaining high impact resistance even under lateral deflection, with the clamping ring's mobility allowing for self-alignment and optimal load transfer.
Implementation Method 1
an elastically deformable sealing ring, preferably made of plastic, is or can be inserted in each of the recesses
Implementation Method 2
the clamping ring's mobility allowing for self-alignment and optimal load transfer
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The invention relates to a coupling (1) for support members, wherein the coupling (1) comprises a sleeve-like coupling sleeve having screw-in openings (6) that proceed from two opposite sides and are each provided with an internal thread (5), wherein a radially inwardly directed mounting protrusion (7) is formed between the two internal threads (5) in the screw-in openings (6) on the inner side of the coupling sleeve, wherein a radial recess (8) is formed in each case between the mounting protrusion (7) and the internal threads (5), said recess (8) adjoining a runout (10) of the adjacent internal thread (5), wherein an elastically deformable sealing ring (12) is inserted in each case into the two recesses (8) and wherein in the unloaded state of the sealing rings, the outside diameter thereof is greater than the inside diameter of the mounting protrusion (7) and/or greater than the core diameter of the internal thread (5), and proposes that the coupling (1) has a clamping ring (11), the outside diameter of which is smaller than or the same as the inside diameter of the mounting protrusion (7), and that the sealing rings (12) have an abutment surface which, for abutment against one of the two lateral surfaces of the clamping ring (11), extends in a radius interval which partially geometrically overlaps a radius interval of the lateral surfaces of the clamping ring (11) when the sealing rings (12) are concentrically aligned with the clamping ring (11).