Door Fixing Device Wedge Mechanism Uneven Floor Compensation
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Solution Overview
Problem
Existing door locking devices struggle to reliably lock doors on uneven ground, as they either fail to compensate for floor unevenness or risk losing contact with the ground due to exclusive clamping mechanisms.
Innovation Solution
A locking device with a locking member that can be clamped to the floor, featuring a support body, a vertically movable positioning device, an elastic element, and a prestressing unit that maintains tension against the ground, allowing for a wedge effect to compensate for unevenness and prevent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a locking member with a brake pad is mounted in a bearing fixed to the door with a horizontal pivot axis, then the device can compensate for bumps, but the braking force depends only on the weight of the locking element and a possibly achievable wedge effect
Solution Approach 1:
The bearing is made vertically displaceable via the positioning device, transforming the static bearing into a dynamic component that can adjust its position. This allows the locking member to adapt to uneven floors while maintaining optimal braking force through active position control rather than relying solely on passive weight-based mechanisms
Solution Approach 2:
The prestressing unit acts as an intermediary component between the positioning device and the locking member, transmitting and amplifying the positioning forces into effective braking forces. This mediator enables the system to convert small positioning movements into significant braking forces that exceed what the locking element's weight alone could provide
2Device complexity
If the locking element is held on the ground exclusively by a clamping effect and can be lifted by a return spring, then the structure is simple, but contact with the ground may be lost on uneven surfaces
Solution Approach 1:
The prestressing unit automatically compensates for ground unevenness by actively adjusting the locking member's position and maintaining continuous prestressing force. This self-adjusting mechanism ensures reliable ground contact without requiring complex additional components or manual intervention, allowing the system to serve itself in maintaining contact reliability
Solution Approach 2:
The prestressing unit applies preliminary prestressing force to the locking member before it contacts the ground. This preliminary action ensures that the locking member is already under tension and ready to maintain reliable contact, preventing loss of contact that would occur with simple clamping mechanisms on uneven surfaces
3Reliability
If the locking member is tensioned against the ground to develop a wedge effect, then movement in the reverse direction is prevented, but the vertical distance between the horizontal axis and the braking element must be maintained
Solution Approach 1:
The positioning device dynamically adjusts the bearing's vertical position to maintain the optimal vertical distance between the horizontal axis and braking element. This dynamic adjustment ensures the wedge effect remains effective for preventing reverse movement while adapting to different floor conditions and locking member positions
Solution Approach 2:
The system uses feedback from the grounding conditions to adjust the bearing position via the positioning device. This feedback mechanism ensures the vertical distance is continuously optimized to maintain the wedge effect's effectiveness, preventing reverse movement while adapting to changing conditions
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 device ensures reliable locking on uneven surfaces by maintaining consistent frictional contact and preventing movement in the locking direction, even on uneven floors, through the combination of a guide tube, carriage, and prestressing mechanism.
Implementation Method 1
an elastic element acting between the positioning device and the supporting body
Implementation Method 2
the friction between the brake link and the ground is proportional to this increasing normal force, movement in the reverse direction is reliably prevented
Implementation Method 3
this caused the strut of the locking link to straighten up and thus a greater normal force between the strut and the underground. Since the friction between the brake link and the ground is proportional to this increasing normal force
Data Source
Figure 1a~1c
Figure 1d
Figure 1e~1f
AI summary
A holding device (101a) for doors comprises: a holding element (130) that can be clamped against a floor; a support body (110); a positioning device (147) that is movable with respect to the support body (110);an elastic element (143) acting between the positioning device (140) and the support body (110), a locking device (144) configured to detachably lock the positioning device (140) in a position relative to the support body (110), a bearing (L1) with a horizontal pivot axis, wherein the vertical position of the bearing is to be controlled by means of the positioning device (140), wherein the locking element (130) is pivotably mounted in the bearing (L1), wherein the locking element has a section extending from the bearing to a free end section, the end section having a braking element (134), and wherein the locking device further has a preload unit (F) to counteract pivoting of the locking element (130) which would shorten the vertical distance between the horizontal axis (L1) and the braking element (134).