Window Brake Spindle Teardrop Cam Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing window and door braking devices are ineffective against vibrations and oscillations, leading to unintended movement of sashes which can cause damage.
Innovation Solution
A door or window braking device with a rail element and a spindle featuring a teardrop-shaped cam that rotates automatically within an L-shaped connecting link, providing a controlled braking effect by transitioning from a longitudinal to a transverse course, secured by a locking ring to prevent undesired displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional window braking devices are used, then the structure is simple, but the device cannot resist vibrations and oscillations, leading to reduced braking force and potential sash movement
Solution Approach 1:
The patent introduces a dynamic braking mechanism where the brake shoe is movable along the brake rail rather than fixed. The brake force is dynamically adjusted through the interaction between the movable brake shoe and the brake rail, allowing the system to adapt to vibrations and oscillations while maintaining reliable braking. This dynamic structure resolves the contradiction by enabling the device to resist vibrations without requiring excessive structural complexity.
Solution Approach 2:
The braking device is segmented into distinct functional components: the brake rail mounted on the frame, the movable brake shoe with friction material, and the actuating mechanism. This segmentation allows each component to be optimized independently - the brake rail provides structural support, the brake shoe applies friction force, and the actuating mechanism controls the braking action. The segmented design achieves reliable vibration resistance while keeping the overall device structure manageable.
2Reliability
If a movable brake shoe mechanism is introduced to resist vibrations, then braking reliability improves, but the device complexity increases
Solution Approach 1:
The brake rail serves multiple functions: it provides structural mounting on the frame, guides the movement of the brake shoe, and acts as the friction surface for braking. The movable brake shoe simultaneously provides the friction braking action and the mechanism for dynamic adjustment. This multi-functionality reduces the number of separate components needed, achieving reliable vibration resistance without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the guiding function and the friction braking function into a single brake rail-brake shoe interface. The brake shoe moves along the brake rail, combining the guide rail and friction surface into one integrated system. This merging reduces component count while maintaining the ability to resist vibrations through dynamic brake force adjustment.
3Reliability
If the brake shoe is made movable to adapt to vibrations, then braking effectiveness is maintained, but the installation space and complexity increase
Solution Approach 1:
The brake shoe is made partially movable along the brake rail rather than fully adjustable. This partial mobility is sufficient to accommodate vibrations and maintain braking effectiveness without requiring the full complexity of an adjustable mechanism. The limited range of motion reduces the space needed while maintaining reliability.
Solution Approach 2:
The position of the brake shoe along the brake rail can be adjusted to change the braking parameters. This parameter adjustment capability allows the system to adapt to different vibration conditions and maintain effectiveness. The ability to modify the brake shoe position provides reliability without requiring a completely complex mechanism, as it simply changes a key parameter rather than reconfiguring the entire system.
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 a stable and secure braking mechanism that maintains the sash in position, preventing unintended movements and damage, while being cost-effective and requiring minimal installation space.
Implementation Method 1
a friction brake (40) which is connected to the slider (7)
Data Source
Figure 1
Figure 2~5
Figure 6~9
AI summary
Door or window brake device 1 for a window or door 2, wherein the device 1 comprises a rail element 3, which is designed for mounting along a frame 4 in a fitting groove 5 of a sash 6 of the window or door 2, and wherein a slide 7, guided longitudinally in the rail element 3, is movably arranged between an open and a closed position of the window or door 2, a projection arm 8 with a first end 9 pivotably connected to the slide 7 and a second end 10, which is designed for connection with the frame 4, and an actuating rod 11, which extends along the rail element 3 and is designed to rotate about a longitudinal axis by actuating the drive rod fitting 12 of the window or door 2, wherein the actuating rod 11 has a non-circular cross-section and interacts with the slide 7 in such a way as tothat the actuating rod 11 rotates between a first angular position in which the slide 7 can slide freely along the rail element 3, and a second angular position in which the actuating rod 11 moves the slide 7 such that the slide 7 is blocked in the rail element 3, wherein the actuating rod 11, with its end 13 furthest from the slide 7, engages in a recess 14 adapted to the cross-section of the actuating rod 11 of a spindle 16 movable on a corner component 15, forming a positive locking connection, and that by actuating the connecting rod fitting 12 by moving a connecting rod 17 with coupling of the spindle 16, the spindle 16 is enabled to rotate and imparts a rotary movement to the actuating rod 11, wherein the spindle 16 is formed from a central bearing 18 and from an eccentrically arranged cam 19,wherein the cam 19, which has a teardrop-shaped cross-section, rests in an L-shaped cam 20 of the connecting rod 17, and upon actuation of the connecting rod fitting 12 follows the longitudinal profile 21 of the cam 20 in a rotation-resistant manner along the connecting rod fitting 12, and transitioning into a transverse profile 22 of the cam 20, the spindle 16 is necessarily rotated about its own axis 23.