One-Piece Plastic Door Stop With Film Hinge and Wedge Shoe
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Solution Overview
Problem
Existing door checks fail to securely lock a door in any open position and do not effectively brake the door during opening or closing directions.
Innovation Solution
A one-piece plastic door check with a chock and fastening means, featuring a film hinge that allows the blocking shoe to move between a blocked and non-use position, utilizing friction between the door and floor to brake the door's movement, and a snap device for easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a door stop is made as a simple one-piece plastic component, then manufacturing complexity is reduced, but the ability to securely lock the door in any open position and effectively brake the door during movement is compromised
Solution Approach 1:
The door stop is segmented into functionally distinct components: a stop shoe for braking, a film hinge for articulation, and a retention mechanism. This segmentation allows each component to be optimized for its specific function while maintaining one-piece manufacturing through injection molding with integrated design
Solution Approach 2:
The film hinge introduces dynamic capability to the one-piece structure, allowing the stop shoe to pivot between a retracted position (when door approaches) and an extended braking position (when door contacts the stop). This dynamic movement enables effective door braking while maintaining manufacturing simplicity
Solution Approach 3:
The film hinge is a thin plastic component that provides flexible articulation between the stop shoe and the mounting bracket. This thin film structure enables the stop shoe to move dynamically while being manufactured as an integrated one-piece component through injection molding
2Reliability
If the stop shoe is fixed in position, then the door can be securely held in place, but the door stop cannot be easily released or repositioned
Solution Approach 1:
The stop shoe transitions from a static fixed position to a dynamic positionable component through the film hinge. The shoe can pivot between a retracted position (allowing door movement), an extended braking position (holding door steady), and can be manually repositioned by applying force to overcome the retention mechanism
Solution Approach 2:
The retention mechanism uses a cam or latch feature that engages with a corresponding slot in the mounting bracket to preliminarily secure the stop shoe in its extended position. This preliminary engagement provides stable door holding, while applying sufficient force in the opposite direction can disengage the retention and allow repositioning
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 door check effectively locks the door in any pivoted position by utilizing friction, allowing the door to be securely held in place until manually released, providing self-locking functionality in both opening and closing directions.
Implementation Method 1
The film hinge is a thin, linear plastic component that, through deformation of the plastic, enables pivoting about a pivot axis like a joint
Implementation Method 2
the door stop according to the invention is attached to the bottom of an inside side of a door leaf such that the stop shoe contacts a surface beneath the door leaf and is located on the inside of the door... slowing the door's movement through friction
Implementation Method 3
the stop shoe of the door stop according to the invention is comparable to a brake shoe for slowing a railway carriage by friction... in the position it occupies in the gap between the door leaf and the floor, it prevents the door from pivoting further... by friction between the door leaf and the door stop on the one hand, and by friction between the door stop and the floor on the other
Data Source
Figure 1~2
AI summary
The invention proposes to form a door stop (1) in one piece from plastic with a wedge as a stop shoe (4) which protrudes at one end on one side from a strip (2), with an angled section (5) with a snap bead as a snap device (8) for holding the stop shoe (4) in a non-use position, and with a film hinge (3) in a middle between the stop shoe (4) and the angled section (5) which elastically acts the stop shoe (4) into a stopping position under a door leaf (11).