Fire Bolt Assembly with Segmented Stop Member
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Solution Overview
Problem
Existing fire bolt assemblies fail to prevent door opening during fires due to melted stop members hindering the positioning bolt's movement, leading to a failure in locking the door effectively.
Innovation Solution
A fire bolt assembly design featuring a stop member with legs that protrude into an axial hole of a mounting member, allowing the positioning bolt to be biased out by a spring once the stop member melts, ensuring reliable engagement with a coupling hole in another door, thus preventing door opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop member is made of plastic material with a melting point of 250-350°C to enable automatic release during fire, then the positioning bolt can be released when the stop member melts, but a considerable portion of the melted stop member remains in the receiving tube and hinders the positioning bolt from moving out, resulting in failure of the locking function
Solution Approach 1:
The stop member is divided into a stop plate and multiple legs, where the legs are positioned to minimize obstruction in the receiving tube when melted. This segmentation allows the melted material to be distributed in a way that reduces blocking of the positioning bolt's movement path.
Solution Approach 2:
The legs of the stop member extend in a direction perpendicular to the main axis of the receiving tube, utilizing radial space rather than axial space. This dimensional arrangement ensures that when the stop member melts, the material occupies radial space rather than blocking the axial path of the positioning bolt.
2Device complexity
If the stop member is completely received in the receiving tube to maintain compact structure, then assembly is simplified, but the melted stop member cannot be easily discharged and blocks the positioning bolt movement
Solution Approach 1:
The stop member is segmented into a stop plate and legs, with the legs positioned to allow melted material to discharge radially outward from the receiving tube rather than remaining entirely within it. This maintains compact assembly while enabling clear passage for the positioning bolt.
Solution Approach 2:
The legs of the stop member extend beyond the inner wall of the receiving tube, effectively extracting part of the stop member structure from the confined space inside the tube. This extraction creates clearance for the positioning bolt to move freely even when the stop member melts.
3Reliability
If the stop member is designed with legs extending into the axial hole of the mounting member to prevent premature movement, then the positioning bolt is held securely in the receiving space, but the structure becomes more complex
Solution Approach 1:
The legs of the stop member serve multiple functions: they provide structural support to hold the stop plate in position, engage with the mounting member to prevent premature movement of the positioning bolt, and when melted, their radial extension facilitates discharge of melted material. This multi-functionality reduces the need for additional components.
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 the positioning bolt can reliably move out of the receiving tube after the stop member melts, maintaining the door's locked state during a fire by minimizing the obstruction from melted stop member material, thereby enhancing the fire-resistant locking function.
Implementation Method 1
a spring received in the receiving space of the receiving tube and compressed between the rear end of the positioning bolt and the rear end of the receiving tube. The front end of the positioning bolt is biased by the spring and presses against the inner side faces of the first and second legs of the stop member.
Implementation Method 2
The stop member is made of material having a melting point lower than those of the mounting member, the positioning bolt, and the receiving tube. The stop member holds the positioning bolt in the receiving space of the receiving tube. The spring biases the front end of the positioning bolt out of the front end of the receiving tube when the stop member melts.
Implementation Method 3
The positioning bolt is moved out of the receiving tube and engaged with an engaging hole in another door or a door frame when the stop member melts due to the heat of the fire, allowing locking of the door in the event of a fire.
Data Source
AI summary
A fire bolt assembly (10) includes a receiving tube (20) mounted in a door (106). A mounting member (32) is mounted to the receiving tube (20) and includes two coupling faces (56). A positioning bolt (90) is received in the receiving tube (20) and includes a front end (92). A spring (100) is mounted in the receiving tube (20) for biasing the front end (92) of the positioning bolt (90) out of the receiving tube (20). A stop member (58) includes two legs (66) respectively engaged with the coupling faces (56) of the mounting member (32) to hold the positioning bolt (90) in the receiving tube (20). The front end (92) of the positioning bolt (90) is moved out of the receiving tube (20) to engage with a coupling hole (116) in another door (112) or a door frame when the stop member (58) melts due to the heat of the fire, locking the door (106) in place during the fire.