Multi-Level Sofa Hinge With Covered Gears for Finger Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sofa hinges with exposed gear mechanisms pose a risk of finger injury during position transitions, as they can snap operators' fingers while converting the sofa from one position to another.
Innovation Solution
A sofa hinge design featuring a first and second bracket connected by a bolt, with a semi-circular portion on the second bracket and a cover plate that conceals the gear mechanism, along with an enlarged second lever latch providing additional protection on the inside surface, reduces the risk of finger injury by covering the gear mechanism both externally and internally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gear mechanism is exposed to allow easy operation, then the operator can easily convert the sofa between positions, but the operator's fingers are at risk of being pinched or injured by the exposed mechanism
Solution Approach 1:
A cover plate is introduced as an intermediary component between the operator's fingers and the gear mechanism. The cover plate rotates with the mechanism during position conversion, allowing the mechanism to function while preventing direct contact between fingers and moving parts. This resolves the contradiction by maintaining ease of operation through the rotating cover plate while eliminating the finger injury hazard.
2Object-affected harmful factors
If a cover plate is added to protect against finger injury, then operator safety is improved, but the device complexity increases
Solution Approach 1:
The cover plate is merged with the existing rotating mechanism by connecting it to the lever assembly. The cover plate rotates together with the lever and gear mechanism as an integrated unit, rather than being a separate driven component. This reduces device complexity by combining protective function with the existing motion system, eliminating the need for additional motors or control mechanisms.
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 design enables safe and easy conversion of the sofa between positions by substantially reducing the risk of finger injuries through comprehensive coverage of the gear mechanism, enhancing operator safety.
Implementation Method 1
a first bracket and a second bracket, where the first and second brackets are rotatably connected together via a first bolt
Implementation Method 2
the second lever latch comprises a pin used to select one of the plurality of notches of the lever to select a position of the sofa
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A sofa hinge (100) that provides easy conversion of a sofa convertible from one position to another while providing added safety by substantially reducing the risk of an injury to the operator's fingers. The sofa hinge (100) includes a first and a second bracket (101,102) rotatably connected to the sofa hinge at a bolt (103). The sofa hinge (100) further comprises a lever gear mechanism connected to the first bracket (101) via a first lever latch (106) on the first bracket (101). The lever gear mechanism is connected to the second bracket (102) via a second lever latch (110) on the second bracket (102). The first bracket (101) has cover plates (119, 201) on both the inside and outside surfaces of the bracket. The second bracket (102) includes a cover plate (201) attached on the outside surface. The second lever latch (110) can larger than the first lever latch (106) and function as an additional cover plate on the inside surface of the sofa hinge (100). By having the cover plates (119,201) and second lever latch (110) cover the lever gear mechanism of the sofa hinge (100) on both the outside and inside surfaces of the sofa hinge (100) , the risk of injury to the operator's fingers is substantially reduced.