Wall-Cupboard Hanging Bracket with Shear-Resistant Peg Fixing
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Solution Overview
Problem
Existing hanging brackets for wall-cupboards often fail to provide effective, durable, and safe anchoring due to shear forces generated when the cupboard is loaded, particularly those with plastic components, leading to potential falling and breakage.
Innovation Solution
A visible hanging bracket with a metallic base and shear-resistant pegs made of plastic material with a sawtooth profile, which are pressure-inserted into holes on the cupboard shoulder, combined with traditional self-tapping screws for secure fixation, allowing for easy and firm assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional self-tapping screws or pressure-yielding pins are used to fix the hanging bracket to the cupboard shoulder, then the assembly is simple and economical, but the resistance to shear stress is insufficient leading to potential failure under load
Solution Approach 1:
The fixing system is divided into two distinct components: shear-resistant pins that resist lateral forces and self-tapping screws that provide anchoring. This segmentation allows each component to specialize in resisting specific types of stress, with the pins handling shear forces and screws handling pull-out forces, thereby improving overall strength without requiring a single complex fixing mechanism
Solution Approach 2:
The invention combines metallic pins with plastic yielding pins and wooden plugs to create a composite fixing system. The metal pins provide shear resistance, the plastic pins provide yielding characteristics, and the wooden plugs provide anchoring in the shoulder. This composite approach allows the system to resist multiple types of stress simultaneously while maintaining relative simplicity
2Shape
If the cupboard panel thickness is reduced to meet modern design trends, then the aesthetic appearance and modernity are improved, but the anchoring effectiveness and safety of the hanging bracket are compromised
Solution Approach 1:
The fixing system uses a nested structure where wooden plugs are inserted into holes in the cupboard shoulder, metal pins are inserted into slots in the bracket, and plastic yielding pins connect the bracket to the shoulder. This nested arrangement allows the fixing mechanism to be embedded within the limited thickness of modern thin cupboards while maintaining effective anchoring through the combination of multiple nested components
Solution Approach 2:
The invention changes the parameters of the fixing system by using thin metal pins with precise dimensions and plastic yielding pins with specific geometric profiles that allow them to expand and lock into place. These parameter changes enable effective anchoring in reduced thickness panels by optimizing the size, shape, and material properties of the fixing components to work within thinner dimensions
3Ease of manufacture
If plastic material is used for the box-shaped body to reduce cost and weight, then manufacturing cost and weight are reduced, but the resistance to shear forces and durability are insufficient
Solution Approach 1:
The invention creates a composite structure by combining the plastic box-shaped body with metal pins and wooden plugs. The plastic body maintains cost-effectiveness and light weight, while the metal pins provide the necessary shear force resistance. This composite approach allows the system to achieve high strength-to-cost and strength-to-weight ratios by strategically placing strong materials only where needed for structural integrity
Solution Approach 2:
The invention applies local quality by using metal pins specifically at the fixing points where shear forces are concentrated, while the rest of the bracket body remains plastic. This localized application of high-strength material ensures shear force resistance is provided exactly where needed, rather than requiring the entire bracket to be made of expensive metal, thereby maintaining cost-effectiveness while improving strength at critical locations
Data Source
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AI summary
A hanging bracket (10) for the wall assembly (P) of a wall-cupboard (11) comprising, in combination: a metallic base (21), an arm (13) assembled and articulated on said base (21) and protruding from it with a hook (14) suitable for being anchored to a plate (or other equivalent element (15)) fixed to said wall (P), first and second regulation mechanisms (19, 20) for regulating the position of said arm (13) in height and in depth, respectively, a flange (22) integral with said base (21) and equipped with at least one fixing unit (U) of the hanging bracket (10) to said wall- cupboard (11), wherein said fixing unit (U) comprises a shear-resistant element cooperating with a fixing peg (32) of the hanging bracket (10) to a shoulder (12) of the cupboard (11). According to the invention, said peg (32) is fitted onto a collar (31) protruding from said flange (22), there also being reciprocal fixing means between said collar (31) and said peg (32), to make them integral with each other.