Shelf Support Bracket Geometry for Secure Borehole Anchoring
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Solution Overview
Problem
Existing shelf supports fail to securely anchor into boreholes in wood or timber products, leading to the wall pin being pulled out under load due to inadequate anchoring mechanisms.
Innovation Solution
The shelf support design features legs that form an angle of 85° to 88°, with a horizontal wall pin and a vertical leg projection that creates a support step and cutting edges to anchor into the borehole, and an undercut on the wall pin to prevent withdrawal, enhancing stability and load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wedge noses are formed on the wall pin to cut into the bore wall, then anchoring is improved, but the wall pin is still pulled out under load
Solution Approach 1:
The support mechanism is divided into two distinct stages: first the projection provides initial support and alignment, then the wedge noses provide anchoring, and finally the undercut provides mechanical interlocking. This segmentation of functions allows each element to optimize its specific role without compromising overall performance.
Solution Approach 2:
The projection on the vertical leg performs preliminary action by providing initial support and alignment during installation, positioning the wall pin correctly before the shelf load is applied. This preliminary positioning ensures that the subsequent anchoring mechanisms engage properly under load.
2Ease of manufacture
If the angle between legs is 90°, then manufacturing is simplified, but leverage effect on the horizontal leg increases
Solution Approach 1:
The angle between the legs is changed from the standard 90° to a range of 85°-88°. This parameter modification reduces the leverage effect on the horizontal leg while maintaining ease of manufacture within acceptable tolerances. The slight deviation from 90° optimizes the mechanical advantage without significantly complicating production.
3Ease of operation
If the wall pin is inserted horizontally, then installation is simplified, but the wall pin pulls out under vertical load
Solution Approach 1:
The wall pin design incorporates asymmetric features: the projection on the vertical leg creates an asymmetric support step, and the undercut is positioned asymmetrically to engage with the bore wall in a specific direction. This asymmetry allows the pin to be installed horizontally for ease of operation while the asymmetric features prevent pull-out under vertical load by creating mechanical interlocking in the critical direction.
Solution Approach 2:
The projection on the vertical leg acts as an intermediary element between the horizontal wall pin and the vertical support function. It transfers the vertical load from the horizontal pin through the projection to the bore wall, enabling the horizontally inserted pin to resist vertical pull-out forces.
4Reliability
If cutting edges are added to the wall pin, then anchoring is improved, but manufacturing complexity increases
Solution Approach 1:
The cutting edges are merged with the existing wall pin structure rather than being separate components. The wedge noses and cutting edges are integrated into the wall pin body as continuous features, reducing the number of parts and simplifying manufacturing while maintaining the anchoring function.
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 design ensures a secure anchor in the borehole, reducing the likelihood of the wall pin being pulled out and allowing the shelf support to absorb higher loads with minimal leverage effect, providing improved stability and elasticity.
Implementation Method 1
The free end of the horizontal wall pin has one or more radially outwardly protruding cutting edges (e.g. wedge noses) on its upper side, which can cut into the upper borehole wall of the borehole in order to anchor the shelf support in the borehole of the body wall.
Implementation Method 2
the wall spigot preferably has a support section on its underside, which merges into the outside of the vertical leg via an undercut that is set back inwards. The undercut makes it easier for the support section to tilt on the lower wall of the hole and its sharp-edged edge can dig into the lower, front wall of the hole, whereby the undercut is filled with wood from the body wall and the wall pin is additionally prevented from being pulled out of the hole.
Data Source
Figure 1a~1c
Figure 2a~2c
AI summary
In a shelf support (1) comprising an angle piece (2) with a vertical leg (5) in the assembled position and a horizontal leg (8) in the assembled position and a wall pin (3) which is attached to the outside (4) of the vertical leg (5) is formed protruding horizontally, the invention provides that the outer sides (4, 7) of the two legs (5, 8) enclose an angle (α) of between approx. 85° and approx. 88°, in particular approx. 87°, and that the outer side (4) of the vertical leg (5) below the horizontal wall pin (3) has a projection (10), the end face of which encloses an angle (ß) with the outer side (7) of the horizontal leg (8) which is greater than is the angle (α) and a maximum of 90°.