Panic Door Push Bar Clamping Attachment
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Solution Overview
Problem
Conventional push bar devices for panic doors are costly to manufacture and restrict material choice, particularly for low-thickness sheet metal, and have a visually unappealing appearance due to visible joints and restricted material options.
Innovation Solution
A push bar device where the receiving device is held in the pressure profile via a U-bracket device interacting with a projection device, allowing indirect attachment and eliminating the need for visible joints, enabling the use of thin sheet metal and various materials like stainless steel, with a U-bolt device secured by clamping or spring tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional extruded pressure profiles with undercut rails are used for clip connections, then the connection between pressure profile and gear system is reliable, but the material choice is restricted and manufacturing costs are high
Solution Approach 1:
The pressure profile is divided into functional segments: the extruded pressure profile body provides structural integrity, while separate attachment elements (U-bracket device with clamping means) provide the connection function. This segmentation allows the pressure profile to be made from thin sheet metal without requiring integrated undercut rails, thus expanding material choice while maintaining connection reliability.
Solution Approach 2:
The U-bracket device acts as an intermediary element between the pressure profile and the gear system/receiving device. Instead of directly clipping to undercut rails in the pressure profile, the attachment element mediates the connection by bracing against a projection device on the pressure profile. This intermediary approach enables the use of thin sheet metal pressure profiles while achieving reliable mechanical connection.
2Reliability
If joint connections are used to fasten the receiving device to the pressure profile, then the connection is reliable, but the joints are visible on the opposite side and the manufacturing cost increases
Solution Approach 1:
The connection function is extracted from the pressure profile itself and implemented through separate attachment elements (U-bracket device). The clamping means secure the attachment element to the pressure profile from the rear side, taking the joint connection out of the visible front area. This extraction eliminates visible joints on the pressure profile while maintaining reliable connection through the clamping mechanism.
Solution Approach 2:
Instead of making joints visible on the front side of the pressure profile as in conventional designs, the connection is inverted to occur on the rear side. The clamping means fasten the attachment element to the pressure profile from behind, making the joints invisible from the visible side. This inversion resolves the contradiction between reliable connection and visual appearance.
3Reliability
If the pressure profile has sufficient material thickness for conventional clip connections, then the connection is reliable, but thin sheet metal cannot be processed
Solution Approach 1:
The U-bracket device with clamping means serves as an intermediary that enables reliable connection without requiring thick pressure profile material. The attachment element distributes connection forces and provides its own structural integrity, allowing the pressure profile to be made from thin sheet metal while maintaining reliable mechanical connection to the gear system.
Solution Approach 2:
The connection mechanism parameters are changed from requiring integrated undercut rails in thick material to using separate clamping attachment elements that brace against projections. This parameter change in the connection approach enables the pressure profile to use thin sheet metal while achieving equivalent or superior connection reliability through the clamping mechanism.
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
This design simplifies manufacturing, allows for a wider material choice, and maintains a visually appealing appearance by eliminating the need for extruded rails and visible joints, while ensuring reliable connection and operation of the door lock.
Implementation Method 1
The U-bolt device is pressed with the clamping means device at its free ends against the projection device of the pressure profile, so that it is thus fastened to the pressure profile by a positive and frictional connection.
Data Source
AI summary
The present invention relates to an unlocking device for opening a panic door (10) having a door leaf (16) and a door lock (18), comprising a U-shaped basic profile (22) which can be fastened to the door leaf (16), a U-shaped pressure profile (28) complementary to the basic profile (22), wherein the basic profile (22) and the pressure profile (28) are inserted into one another via their respectively open side and the pressure profile (28) is movable relative to the basic profile (22), a gear system (30) which is arranged between the basic profile (22) and the pressure profile (28) and which converts a movement of the pressure profile (28) into a movement for opening the door lock (18), wherein the gear system (30) comprises a receiving device (32) for receiving and transmitting the movement of the pressure profile (28), wherein the receiving device (32), a U-clip device (55) and a bracing means device (70) are arranged in the pressure profile (28), wherein the receiving device (32) is held by the U-clip device (55) in the pressure profile (28) by bracing in that the U-clip device (55) is prestressed by means of the bracing means device (70) against a projection device (58) formed fixedly on the pressure profile (28).