Removable Wall Anchor With Expansion Head for One-Handed Load Suspension
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Solution Overview
Problem
Existing removable anchoring devices for rock-climbing and load hoisting often have a shank diameter smaller than the drilled hole, requiring over-dimensioned female and hole components, and are difficult to use and remove, especially when stressed.
Innovation Solution
A removable anchoring device with a male body that matches the hole diameter, featuring a radially expandable female body and a male body with a stop part for secure insertion, allowing for one-handed operation and reduced overhang, utilizing a flexible compression part for instantaneous locking and a stop part for load suspension close to the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shank diameter is made smaller than the hole diameter, then the device can be inserted into the hole, but the female body and drilled hole become over-dimensioned, increasing device complexity and reducing manufacturing precision
Solution Approach 1:
The male body with expansion head is nested within the female body, allowing the shank to have a diameter matching the hole while the expansion mechanism provides the necessary anchoring function without requiring an oversized hole or female body
Solution Approach 2:
The anchoring device is divided into a male body (shank with expansion head) and a female body (expandable anchoring element), allowing each component to be optimized independently - the shank matches the hole diameter while the expandable portion provides anchoring without over-dimensioning
2Stability of the object's composition
If the female body is made sufficiently long to ensure coaxiality, then the shank remains coaxial with the drilled hole, but the device length increases and handling becomes more difficult
Solution Approach 1:
The expansion head is pre-positioned on the male body at a distance from the rear stop, ensuring that when the device is inserted, the expansion occurs at the correct position to guarantee coaxiality without requiring an excessively long female body
Solution Approach 2:
Coaxiality is ensured locally at the expansion zone rather than requiring the entire female body to be excessively long - the expansion head's position and the female body's expandable portion are designed to maintain coaxiality only where needed
3Ease of operation
If the device is designed for tool-free removal, then ease of operation improves, but the reliability of anchoring under heavy stress may be compromised
Solution Approach 1:
The device transitions from a static anchored state to a dynamic removal state through the relative axial movement of the male and female bodies - the expansion head moves axially relative to the female body to either engage or disengage the anchoring mechanism, allowing tool-free operation while maintaining reliability under stress
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 dependable and quick one-handed installation and removal without tools, reducing mechanical stress and overhang, while maintaining secure anchoring even under heavy loads.
Implementation Method 1
a flexible compression part engaged on the male body and fitted in compression between the stop of the female body and the stop of the male body, in order to bias the male body and the female body in the direction of engagement of the expansion head in the radially expandable area
Implementation Method 2
Due to the effect of its expansion, the female body is applied against the surface of the drilled hole, which makes a connection by adherence and secures the bolt in the drilled hole
Data Source
AI summary
A removable anchoring device designed to be inserted in a hole drilled in a wall, and designed to support a mechanical load, including a female body provided with a radially expandable front area designed to be inserted in the hole and with a rear stop designed to be outside the hole, a male body slidingly engaged in the female body including an expansion head at its front end, the male body including a rear stop designed to be outside the hole, a flexible compression part fitted in compression between the stop of the female body and the stop of the male body in order to bias the male body and the female body in the direction of engagement of the expansion head in the radially expandable area, the male body presenting a stop part determining a penetration length into the drilled hole.