Hinge Stop-Lock Plate Reinforces Door Groove Protrusions
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Solution Overview
Problem
Traditional hinges for medium-large doors and windows suffer from precision, security, and durability issues, particularly with extruded profiles having deep grooves and thermal break features, leading to misalignment and fatigue breakage due to the bending of protrusions under weight.
Innovation Solution
A hinge with a stop-lock plate having a polygonal shape with protuberances and serrations that engage both longitudinal and transverse sections of the groove, providing a secure and reliable fastening system that reinforces the protrusions from within the groove without altering the basic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hinge fastening system is used with simple plate and cam profile, then assembly is quick and easy, but precision, security and durability are compromised due to protrusion bending under weight
Solution Approach 1:
The fastening plate is divided into multiple functional zones: cam profile area for tightening, protrusions for lateral engagement, and serrations for deep groove engagement. Each segment performs a specific function to collectively provide robust fastening while maintaining ease of assembly.
Solution Approach 2:
The fastening mechanism transitions from two-dimensional plate engagement to three-dimensional engagement by adding protrusions that engage with longitudinal grooves and serrations that engage with transverse grooves. This multi-dimensional engagement prevents protrusion bending and improves durability without complicating assembly.
2Temperature
If extruded profiles with deep grooves and thermal break features are used, then thermal insulation is improved, but bending strength is reduced making profiles less resistant to deformation
Solution Approach 1:
The fastening plate applies localized reinforcement at critical stress points: protrusions are positioned to engage with longitudinal grooves at points of high bending stress, while serrations engage with transverse grooves to prevent lateral deformation. This localized engagement compensates for the weakened sections caused by thermal break features.
Solution Approach 2:
The fastening system creates a composite structure where the metal plate with geometric features (protrusions and serrations) works in conjunction with the extruded profile. The plate reinforces the weak points of the thermally broken profile, creating a hybrid structure that maintains both insulation and strength.
3Ease of manufacture
If protrusions are used to fasten hinge flap to frame, then fastening is achieved, but protrusions bend under pushing force widening the groove and causing misalignment
Solution Approach 1:
The plate is pre-formed with protrusions and serrations in specific positions and orientations before assembly. This preliminary geometric configuration ensures that when the plate is tightened, the protrusions engage with the longitudinal grooves and serrations with the transverse grooves in the correct orientation, preventing misalignment and groove widening.
Solution Approach 2:
The fastening plate acts as an intermediary element between the hinge flap and the frame profile. The protrusions and serrations on the plate serve as mediator structures that distribute the fastening force across multiple engagement points, preventing direct bending of the protrusions and maintaining alignment precision.
Data Source
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AI summary
Described is a hinge for doors and windows comprising a fixed frame (1) and a mobile frame (2) whose profiles form respective fastening grooves (C1, C2) each comprised of a pair (3, 4) of facing upturned L-shaped protrusions or "wings". The hinge (6) comprises: a first hinge body (7) having a first flap (8) that can be associated with the groove (C1) in the fixed frame (1); a second hinge body (10) having a second flap (11) that can be associated with the groove (C2) in the mobile frame (2); a hinge pin (13) defining the axis of rotation (Z) of the mobile frame (2); first fastening means (9) and second fastening means (12), each comprising screw elements (14) inserted into respective holes (15) in each flap (8, 11) and operating on respective stop lock elements (16) acting on the protrusions (3, 4) and housed in the respective grooves (C1, C2); each stop lock element comprises a single polygonal plate (16); at the two distal edges (16a, 16b), on opposite sides of and parallel to the plate (16) and on the flat opposite surfaces of the plate (16) there is a plurality of protuberances (18, 19) which, upon screw fastening, penetrate simultaneously both frontally, that is to say, into the longitudinal sections (3b, 4b), and vertically, that is to say, into the inside surface of the transversal sections (3a, 4a).