Fire Door Frame Backing Device with Adjustable Spacing
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Solution Overview
Problem
Conventional enclosing frames with adjustable mouth widths face difficulties in assembly, particularly when the distance between the frame spar and the wall reveal is small, and there is a need for simplified large-scale production suitable for various structural conditions, including fire protection doors.
Innovation Solution
The design incorporates a backing device with spacer elements featuring a clamping lug and anti-tilting stop, allowing for easy attachment of the frame part bars to the wall area without requiring subsequent mortar work, using inclined dowel mounting and a clamp connection that adjusts the mouth width, enabling secure fastening even in tight spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional frame assembly method is used with small distance between frame spar and wall reveal, then the frame structure is simple, but it is difficult to introduce spacer element between frame spar and wall reveal
Solution Approach 1:
The frame is divided into two separate frame parts (first frame part and second frame part) that can be assembled in stages. The first frame part is attached to the wall with spacer elements, and the second frame part is subsequently connected to it. This segmentation allows spacer elements to be properly introduced even when the overall frame width is small, as the assembly process is broken into manageable steps where spacing can be established first.
2Ease of manufacture
If dry attachment without subsequent mortar work is used, then assembly is simplified and aesthetic appearance is improved, but the frame requires precise positioning during assembly
Solution Approach 1:
Spacer elements are pre-positioned between the first frame part and the wall reveal before the frame is fully assembled and fixed. These spacer elements establish the correct positioning and spacing in advance, ensuring that when dry attachment is used without subsequent mortar work, the frame maintains precise positioning and proper clearance from the wall throughout the assembly process.
3Adaptability or versatility
If an adjustable mouth width frame is designed, then versatility for different building openings is improved, but the frame structure becomes more complex
Solution Approach 1:
The frame is segmented into a first frame part and a second frame part that can be connected in different configurations. The first frame part attaches to the wall, while the second frame part connects to the first frame part, allowing the mouth width to be adjusted by changing the configuration or positioning of these segments. This segmentation provides adjustability without requiring a completely complex adjustable mechanism throughout the entire frame structure.
4Reliability
If fire protection door requirements are met, then safety and reliability are improved, but the assembly process and structural requirements become more stringent
Solution Approach 1:
The first frame part is pre-assembled and attached to the wall with spacer elements before the second frame part is connected. This preliminary assembly ensures that fire protection requirements are met at the critical wall interface, where proper spacing and secure attachment are essential for fire resistance. The two-part structure allows fire protection measures to be implemented at the appropriate stage without complicating the overall assembly process.
Data Source
Figure 1
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AI summary
The invention relates to the technical field of door frames and, in particular, their backing to achieve a fire protection function. To achieve an adjustable opening width in a fire-resistant door frame using simple design means, the invention provides a backing device (18) for backing a surrounding door frame (10) with an adjustable opening width, which surrounding door frame (10) has a first frame section (36, 40) and a second frame section (88, 92), wherein the frame sections (36, 40;88, 92) are designed to enclose a wall area bordering a building opening and engage each other slidably to adjust a jaw width, wherein the backing device (18) comprises at least one spacer element (28, 30) which has an opening for a fastener to pass through, by means of which the first frame member (36, 40) is to be fastened to the wall area and is designed to maintain a distance between the first frame member (36, 40) and the wall area, wherein a clamping tab (34) is formed on the spacer element (28) or on at least one (28) of several spacer elements (28, 30), which is designed to slidably clamp a flange (96) or insertion area (24) of the second frame member (88, 92) to the first frame member (36, 40).