Cam assembly with interlocking parts for furniture
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Solution Overview
Problem
Reclining furniture with mechanisms like rockers, gliders, and swivels poses assembly challenges due to the precision required for interlocking parts, which is beyond the ability of average individuals in ready-to-assemble furniture setups, and existing solutions fail to provide effective interlocking systems for easy assembly and disassembly.
Innovation Solution
A multi-piece cam assembly system comprising first and second cam pieces with integrated interlocks that form a snap-fit locking arrangement, allowing for easier assembly and disassembly of furniture bases to frames, suitable for recliners, rockers, gliders, and other mechanisms, including configurations for various types of sleepers and combinations thereof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional interlocking mechanisms are used in reclining furniture, then the furniture structure provides stability and strength, but the assembly precision required is beyond the ability of average individuals
Solution Approach 1:
The cam mechanism is divided into multiple independent components: a cam member with cam lobes, a cam follower, and a receiver. This segmentation allows each component to be manufactured with standard tolerances while achieving precise interlocking through their coordinated geometry, making assembly accessible to average consumers without requiring ultra-precise manufacturing.
Solution Approach 2:
The cam follower acts as an intermediary element between the cam member and the receiver. It translates the rotational motion of the cam member into linear motion that drives the interlocking action, providing a mechanical advantage that simplifies the assembly process while maintaining structural reliability.
2Strength
If traditional cam mechanisms are used as single-piece units, then the interlocking is strong, but the mechanism is difficult to disassemble and service in the field
Solution Approach 1:
The cam mechanism is segmented into removable components (cam member, cam follower, receiver) that can be independently serviced. The cam follower can be removed and replaced without disassembling the entire furniture piece, enabling field serviceability while maintaining strong interlocking when properly assembled.
Solution Approach 2:
The mechanism uses dynamic cam lobes that rotate to engage and disengage the cam follower, creating a controlled mechanical advantage during assembly and disassembly. This dynamic action allows strong interlocking during use while enabling easy separation when needed for service or replacement.
3Ease of manufacture
If precision interlocking parts are manufactured for ready-to-assemble furniture, then the furniture can be assembled, but the precision required is typically beyond the ability of the average person
Solution Approach 1:
By segmenting the cam mechanism into standardized components with defined interfaces, each part can be manufactured using conventional machining processes with standard tolerances. The cumulative precision is achieved through the coordinated geometry of multiple parts rather than requiring ultra-precise single-part manufacturing, making production accessible to typical furniture manufacturers.
Data Source
AI summary
A mechanism and method for assembling a base to a piece of furniture is provided with at least two cam pieces having complimentary interlock mechanisms constructed and arranged to interlock one to another to form a cam. A plurality of interlock mechanisms may be provided, as well as a plurality of positioning elements on respective cam pieces.