Insulation Fastener with Sliding Sleeve for Compression Accommodation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fastening devices for insulation materials, such as mineral wool, fail to accommodate compressive movements like those caused by snow or traffic, leading to potential puncturing of roofing membranes due to inadequate flexibility and complex mounting processes.
Innovation Solution
A fastening device with a screw having a continuous screw thread from the head to the tip, featuring an intermediate nut that allows axial movement and post-tensioning, enabling the device to follow compressive changes while simplifying the mounting process by allowing the sleeve and screw to be inserted together into a support without requiring hammering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fastener with a rigid flange and fixed length is used to fasten insulation material, then post-tensioning capability is achieved, but the fastener cannot accommodate compressive movement of the insulation layer causing roofing membrane puncture
Solution Approach 1:
The fastening device incorporates a telescopic mechanism with a sleeve that can move axially relative to the fastener shaft. This dynamic structure allows the fastener to adjust its length in response to compressive forces from snow or traffic loads on the roofing membrane, preventing membrane puncture while maintaining post-tensioning capability through controlled axial movement.
2Strength
If a stud fastener with hammered mounting is used, then secure fixation in the support is achieved, but the mounting process becomes complex and time-consuming
Solution Approach 1:
The invention combines the fastener shaft and sleeve into a pre-assembled unit where the sleeve is slidably mounted on the shaft during manufacturing. This merged structure eliminates the need for separate hammering and assembly steps on-site, as the entire fastening device can be inserted and secured in a single operation, significantly simplifying the mounting process while maintaining secure fixation.
Solution Approach 2:
The sleeve is pre-positioned on the fastener shaft during manufacturing with proper alignment and spacing. This preliminary action ensures that during installation, the fastener is ready for immediate use without requiring complex field assembly or adjustment, reducing installation time and complexity while ensuring proper function from the start.
3Reliability
If the sleeve length is adjusted without visible control, then post-tensioning is achieved, but the mounting process becomes difficult to control and verify
Solution Approach 1:
The fastening device incorporates visual indicators such as colored rings, markings, or transparent sections on the sleeve that change position or color as the sleeve moves axially relative to the shaft. These visual cues allow installers to easily detect and verify the sleeve's position and the degree of post-tensioning applied, providing clear feedback during the mounting and adjustment process.
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 ensures the fastening device can accommodate compressive movements without puncturing roofing membranes and simplifies the mounting process by allowing the sleeve and screw to be inserted together, maintaining post-tensioning capabilities and reducing the need for frequent adjustments.
Implementation Method 1
a screw (8) having a head (9) and a shank (10) extending from the head (9). The shank (10) is provided with a screw thread (11)
Implementation Method 2
The intermediate element (12) is axially slidably, yet rotationally fixedly held in a wide portion (7a) of the inner passage (7)
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A fastening device, comprising: - an elongate sleeve that at a first end is provided with a radially extending flange and that a second end is provided with a tip, the sleeve further being provided with a passage that axially extends therethrough, the passage comprising a first portion that extends from the first end towards the tip and which continues into a second portion of reduced diameter that extends through the tip to the second end, - a screw, having a head and a shank extending therefrom, the shank being provided with a screw thread and having a diameter less than the second portion of the passage of the sleeve, and - an intermediate element, screwably received on the screw thread of the screw and having a diameter larger than the diameter of the second portion of the passage of the sleeve, but smaller than the diameter of the first portion of the passage of the sleeve, such that the screw and the intermediate element as an assembly are receivable in the passage of the sleeve so that the intermediate element is axially slidably yet rotationally fixedly held in the first portion of the passage of the sleeve, while a portion of the shank axially slidably extends through the second portion of the passage.