Sofa Sleeper Mechanism Installation With Hanging Support Alignment
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Solution Overview
Problem
The existing assembly process for sofa sleeper mechanisms is inefficient and labor-intensive, requiring at least two individuals to maneuver a heavy sofa frame over a sleeper mechanism, leading to potential misalignment and instability of the attachment, which can result in the mechanism falling out when used.
Innovation Solution
The sofa frame is rotated backward with hanging support members extending into the sleeper mechanism cavity, allowing the mechanism to be inserted and supported by these members during fastening, eliminating the need for workers to lift the frame and ensuring secure attachment with additional fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sofa frame is lifted and maneuvered over the sleeper mechanism by workers, then the sleeper mechanism can be installed into the frame, but the process becomes labor-intensive and requires at least two individuals
Solution Approach 1:
The patent inverts the conventional installation sequence by first positioning the sleeper mechanism on the floor and then lifting the sofa frame over it, rather than lifting the frame and maneuvering it over the mechanism. This inversion allows workers to stand on the floor while installing, eliminating the need to lift heavy frames and improving both ease of manufacture and productivity
Solution Approach 2:
The sofa frame is prepared in advance with hanging support members (studs, bolts, or screws) extending from the side panel members before the installation process begins. This preliminary preparation allows the sleeper mechanism to be easily guided onto these pre-positioned supports, simplifying the installation process and reducing labor requirements
2Reliability
If workers maneuver the heavy sofa frame to position fasteners into L-shaped slots, then the sleeper mechanism can be attached, but misalignment and instability occur
Solution Approach 1:
By inverting the installation sequence and positioning the sleeper mechanism first, the hanging support members on the frame naturally guide onto the L-shaped slots during the lifting process. This gravitational guidance ensures proper alignment without requiring precise manual positioning, thereby improving both attachment stability and alignment precision
Solution Approach 2:
The L-shaped slots act as intermediaries that guide the hanging support members into proper alignment. The geometry of the L-shaped slots ensures that the studs, bolts, or screws self-align as the frame is lowered, eliminating misalignment issues and ensuring stable attachment without requiring high manufacturing precision in the positioning process
3Reliability
If fasteners are guided into L-shaped slots and tightened, then the sleeper mechanism attaches to the frame, but the fasteners are not readily accessible or viewable
Solution Approach 1:
The L-shaped slots serve as intermediaries that both secure the fasteners and provide access to them. The open geometry of the L-shaped slots allows workers to see and reach the fasteners from the front during installation and future maintenance, while still providing secure attachment. This resolves the contradiction by making fasteners both secure and accessible through the intermediary slot structure
Data Source
AI summary
Improved methods and apparatuses relating to installation of a sleeper mechanism into a frame of a sofa sleeper are disclosed. In one embodiment, initially the frame is aligned such that an open bottom portion of the frame is upright and facing outwardly. The sleeper mechanism is then advanced towards the open bottom portion and hook apertures on the brackets are engaged with upper fasteners on the frame. The sleeper mechanism is then swung inwardly towards the top portion of the frame until notches on the bracket are passed lower fasteners on the frame and then swung back towards the open bottom portion to engage the notches with the lower fasteners.