Expansion Anchor Depth Marking Eliminates Special Drills

Solution Overview

Problem

Existing expansion anchors require a special collar drill to ensure the blind hole is drilled to the correct depth, which is inconvenient and not necessary if the hole is drilled without a stop collar.

Innovation Solution

An expansion anchor with a tubular expansion sleeve and anchor bolt, featuring a first and second setting depth marking, allowing the expansion sleeve to be used as a test gauge to determine if the blind hole is of sufficient depth for expansion, eliminating the need for a special collar drill.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a special collar drill with stop collar is used to ensure correct drilling depth, then the anchoring precision is improved, but the device complexity and ease of operation deteriorate

Engineering Contradiction:

Improvedrilling depth precisionVSAvoiddrilling equipment complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The expansion anchor serves dual purposes: it is both the fastening component and the depth gauge. The setting depth marking on the expansion sleeve allows the anchor itself to indicate whether the hole depth is sufficient, eliminating the need for separate depth control equipment like collar drills with stop collars.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The expansion sleeve is designed to perform multiple functions: it provides the expansion mechanism for anchoring and simultaneously serves as a depth measurement tool through its setting depth marking. This multi-functionality integrates the depth gauge function into the anchor itself, removing the need for specialized drilling equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If a special collar drill with stop collar is used to ensure correct drilling depth, then the anchoring precision is improved, but the ease of operation deteriorates

Engineering Contradiction:

Improvedrilling depth precisionVSAvoidinstallation convenience

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The expansion anchor serves dual purposes: it is both the fastening component and the depth gauge. The setting depth marking on the expansion sleeve allows the anchor itself to indicate whether the hole depth is sufficient, eliminating the need for separate depth control equipment like collar drills with stop collars.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The expansion sleeve is designed to perform multiple functions: it provides the expansion mechanism for anchoring and simultaneously serves as a depth measurement tool through its setting depth marking. This multi-functionality integrates the depth gauge function into the anchor itself, removing the need for specialized drilling equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If the blind hole is not drilled deep enough, then the productivity is improved by reducing drilling time, but the reliability deteriorates as the expansion sleeve protrudes beyond the borehole mouth

Engineering Contradiction:

Improvedrilling speedVSAvoidanchoring reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The setting depth marking on the expansion sleeve provides visual feedback to the installer. When the marking is visible, it indicates that the hole depth is insufficient and the anchor should not be expanded. This feedback mechanism prevents incorrect installation while allowing quick drilling without stop collars.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The setting depth marking is pre-positioned on the expansion sleeve at a distance from the expansion section. This preliminary positioning allows the installer to check hole depth before expansion, ensuring proper installation depth is achieved while maintaining drilling efficiency.

Inventive Principle:

Principle #10Preliminary action

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

Enables accurate anchoring without a special collar drill, ensuring the expansion anchor is properly seated and expanded within the blind hole, providing a reliable fastening solution while allowing for conventional tool usage.

Implementation Method 1

an expansion section of an expansion sleeve of the expansion anchor is pushed onto an expansion body of the anchor bolt, as a result of which the expansion section expands radially

Methodology Applied

Scientific EffectRadial expansion:

Data Source

PatentEP3121461B1Fastening assembly and expansion anchor

Publication Date: 2018.09.05 FISCHERWERKE ARTUR FISCHER GMBH & CO KG

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AI summary

The invention relates to a fastening arrangement comprising an anchoring base (1) and an expansion anchor (2). The expansion anchor (2) has an anchor bolt (8) and an expansion sleeve (9) and can be anchored by expanding the expansion sleeve (9) in a blind hole (4) in the anchoring base (1). A first setting depth marking (17) is arranged on the expansion sleeve (9), the front end (22) of which, in the insertion direction (E), is located at the borehole opening (5) or in the blind hole (4) when the expansion anchor (2) is inserted into the blind hole (4) as intended in an unexpanded state.