Insulating Panel Fastening Without Dowels in Masonry
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Solution Overview
Problem
Existing fastening systems for insulating boards in thermal insulation composite systems require dowels for anchoring, which complicates the assembly and anchoring process, and may not provide secure holding forces without additional construction or tools.
Innovation Solution
A fastening system where the screw is designed with a larger thread diameter than the pre-drilled hole, allowing it to cut into the masonry centrally without dowels, using centering mechanisms like diameter constrictions or grooves to ensure precise alignment and secure anchoring, and optionally featuring a conical leading end for easier insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dowels are used for anchoring the screw in the masonry hole, then secure anchoring is achieved, but the assembly process becomes complicated and requires additional components
Solution Approach 1:
The invention extracts and eliminates the dowel component from the fastening system. The screw is designed with a thread diameter larger than the pre-drilled hole, allowing it to cut into the masonry directly without requiring a separate dowel for anchoring. This removes the need for additional components while maintaining secure anchoring.
Solution Approach 2:
The invention changes the critical parameter of the screw thread diameter to be larger than the hole diameter. This parameter change enables the screw to function both as a fastening element and an anchoring element simultaneously, eliminating the need for separate dowels and simplifying the overall system.
2Device complexity
If the screw thread diameter is larger than the pre-drilled hole, then dowels become unnecessary and assembly is simplified, but precise centering of the screw in the hole becomes difficult
Solution Approach 1:
The invention incorporates centering elements (such as centering pins or tapered sections) on the screw that engage with the pre-drilled hole before the main threading operation. This preliminary centering action ensures proper alignment is established before the larger diameter thread cuts into the masonry, preventing misalignment issues.
Solution Approach 2:
The centering elements act as an intermediary between the larger diameter screw thread and the smaller pre-drilled hole. These elements bridge the diameter difference, guiding the screw into precise centering position while allowing the main thread to cut effectively into the masonry.
3Ease of manufacture
If a standard screw design is used, then manufacturing is simple, but the screw cannot cut into masonry effectively without dowels
Solution Approach 1:
The invention modifies the screw thread parameters (diameter, pitch, and profile) to enable effective cutting into masonry. The thread diameter is specifically designed to be larger than the pre-drilled hole, and the thread profile is optimized for cutting action, allowing the screw to function as both a fastening and anchoring element.
Solution Approach 2:
The screw is manufactured from composite materials or specially formulated alloys that combine ease of manufacturing with enhanced cutting ability. The material composition is optimized to allow the screw to cut effectively into masonry while maintaining structural integrity and resistance to pull-out forces.
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The method involves screwing a spiral (4) of an insulating material holder (1) i.e. spiral retainer (2), completely into an insulating panel (46), and bringing a screw threadless retainer on an outer surface of the insulating panel. Transit screws (106) are anchored into masonry (44) and inserted into a pre-drilled hole (47), where the insulating panel is held at the masonry. The transit screws are centrally fed into the masonry in relation to a diameter of the pre-drilled hole and a large outer diameter of screw threads (36) of the screws and with respect to the pre-drilled hole. An independent claim is also included for a fastening system for attaching an insulating panel to masonry.