Recliner Regulating Device Two-Point Locking Mechanism
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Solution Overview
Problem
The engagement strength between the teeth of the slider and the ratchet gear is low in existing recliner regulating devices due to a one-point support mode, leading to instability when forces are applied to the chair back.
Innovation Solution
A recliner regulating device with a cam, return spring, coulisse, ratchet gear, central shaft, sliders with two self-locking surfaces, and wedges, forming a two-point locking mechanism that engages the self-locking surfaces of the sliders and wedges, allowing for controlled locking and unlocking through rotation of the cam and spring force, enhancing stability and quick-folding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-point support mode is used between the slider and locking cam, then the device complexity is reduced, but the engagement strength between the slider teeth and ratchet gear teeth becomes low
Solution Approach 1:
The patent transitions from a one-point support mode to a two-point support mode by adding another bearing point on the locking cam. This dimensional change in the support structure allows the slider to be supported at two separate locations, thereby increasing the engagement strength between the slider teeth and ratchet gear teeth without significantly complicating the overall device structure.
2Manufacturing precision
If a one-point support mode is used between the slider and locking cam, then the manufacturing precision requirements are reduced, but the stability of the chair back becomes poor
Solution Approach 1:
By introducing a second bearing point on the locking cam, the patent creates a two-point support system that enhances the stability of the chair back. This additional support point provides better structural stability when users lean against the chair back, while the design maintains reasonable manufacturing precision requirements through straightforward geometric features.
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 two-point locking mechanism provides increased engagement strength, stability, and precision in angle regulation and quick-folding of the recliner back, with a compact design suitable for various applications and easy maintenance.
Implementation Method 1
a return spring, wherein the cam and the return spring are connected with the central shaft such that a square hole of the cam and an inner square hole of the return spring form a shaft connection through an outer square part of the central shaft
Implementation Method 2
wherein the cam, the return spring, the coulisse and the ratchet gear are connected with the central shaft; the sliders are connected with the coulisse; the wedges are fitted in sliding grooves of the coulisse
Implementation Method 3
two sliders 103 are supported by two self-locking surfaces 102 of the locking cam 101 under the action of the return spring
Data Source
AI summary
The present invention discloses a recliner regulating device comprising a cam, a return spring, a housing plate, a ratchet gear connected with a central shaft. The external hook of the return spring is fixed in a hole of the housing plate. Sliders are fitted in sliding grooves of the housing plate with the bosses of the sliders being attached with the sliding grooves of the cam. Wedges are fitted in the sliding grooves of the housing plate with the bosses of the wedges being attached with the sliding grooves of the housing plate. The sliding grooves for sliders are perpendicular to the sliding grooves for wedges. A two-point locking-up is formed between the self-locking surfaces of the sliders and the self-locking surfaces of the wedges after the position of the cam is fixed through the central shaft under the action of the return spring.