Seating Furniture Torque Drive Shear Mechanism
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Solution Overview
Problem
Existing chair mechanisms for assisting users in rising from a seated position face challenges in achieving efficient lifting and inclining of the whole body with complex kinematic structures, high precision, and safety, often requiring strong linear drives and large operational spaces, while lacking effective solutions using torque drives with smaller motor power and volume.
Innovation Solution
The implementation of a kinematically original lever system driven by torque drives, where torque motors with reduced power and torque angles less than half a revolution are integrated with a shear mechanism, leveraging a bridge against a pair of levers to lift the seating furniture progressively and cumulatively, with attachment points above the kinematic quadrangle of the lifting mechanism, enabling synchronized and independent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If linear drives with strong power are used to start the lifting mechanism, then the lifting and inclining function is achieved, but the device complexity and operational space requirements increase
Solution Approach 1:
The patent replaces linear drives with torque drives in the lifting mechanism. Torque drives generate rotational force directly at the lifting point, eliminating the need for long linear actuators and complex mechanical linkages. This substitution reduces device complexity while maintaining lifting capability through optimized torque transmission through the shear mechanism.
Solution Approach 2:
The patent transitions from linear actuation to rotational actuation by using torque drives. This dimensional change allows the drive to be mounted vertically or at angles, utilizing rotational motion to achieve the same lifting effect that would otherwise require complex linear mechanisms. The torque drive rotates about an axis, converting rotational motion into the desired lifting motion through the shear mechanism geometry.
2Power
If linear drives with long attachment points are used, then the lifting function is achieved, but the operational space and leverage requirements increase
Solution Approach 1:
The patent uses torque drives that operate in a different spatial dimension - rotational motion about a vertical axis rather than linear motion along horizontal paths. This allows the drive to be compact and mounted close to the lifting point, eliminating the need for long operational spaces required by linear drives with distant attachment points.
Solution Approach 2:
The patent introduces the shear mechanism as an intermediary between the torque drive and the lifting function. The shear mechanism translates the rotational torque into the desired lifting and inclining motion, allowing the torque drive to be positioned optimally without requiring long leverage arms or extensive operating space.
3Power
If torque drives with limited torque are used, then the motor power and volume are reduced, but the lifting capability for normal or above-average weights is compromised
Solution Approach 1:
The patent employs a dynamic shear mechanism that optimizes force transmission during the lifting process. The shear mechanism adjusts the mechanical advantage dynamically as the lifting occurs, allowing the limited torque from the compact drive to be effectively transmitted to lift heavier weights. The kinematic configuration provides optimal mechanical leverage at each stage of the lifting motion.
Solution Approach 2:
The patent changes the mechanical parameters of the shear mechanism to optimize force transmission. By carefully designing the shear angles, lever arm lengths, and kinematic relationships, the system transforms the limited torque from the compact drive into sufficient lifting force. The parameter optimization allows small torque drives to accomplish tasks that would traditionally require larger, more powerful motors.
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
This solution allows for efficient, safe, and comfortable lifting and inclining of the entire seating furniture, supporting normal or above-average weights, with reduced mechanical complexity, smaller motor power requirements, and improved operational safety, while maintaining durability and user safety through controlled movement limits.
Implementation Method 1
building in torque drives, leant by the bridge against a pair of lever of shear mechanism which are lifted together with the shear mechanism upwards and which are by lifting leverage fastened with one end in the torque axis
Implementation Method 2
lever mechanisms used in production of chairs - resting chairs in function of assisting at rising from the chair, represent by kinematic structure, complex mechanisms
Implementation Method 3
starting the lifting mechanism is achieved by torqueing the lever system and moving apart support and levers of lifting shears in a special way
Data Source
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AI summary
Seating furniture with lifting mechanism for the purpose of assistance at rising with the own torque drives according to this invention, represents the solution with original kinematic structure of the mechanism in which there is built in at least one torque drive of small motor power, with torque angles less than one half of the revolution and by means of torque motor drives of such a type and specially solved kinematic structure of leverage, there is achieves optimal function of seating furniture at usint llifting function of furniture for the purpose of assistance at rising, by which it improves total possibilities of function of seats. The invention particularly refers to building in torque drives that are leant by the bridge against a pair of lvers of the shear mechanism and that are easily lifted and rotate relatively together with the sher mechanism upwards and to drives there is fastened special lifting leverage, fastened with one end in the axis of drive torque and the other end leans against the support provided in the point above the kinematic square of the lifting shear mechanism. To the shear square system for listing remains only the role of determining the course of lifting and inclining the seat and lifting the drive and the lever system with starting point in the drive torque axis, exercises in such a way progressive cummulated start of lifting mechanism. Such a lifting is achieved by torque of drive lever system in the way that it drives, which are through the bridge leant against the lever of the shear syste, that lifts them together with torque livers and shear mechanism upwards, simultaneousla moving apart the lever system and special support of seating furniture that, included in the kinematic system progressively cummulatedly lifts and adequately inclines the seating furniture. The lifting system has thereby starting point in the drive torque axis and the other footing is at the minimum distance from the drive torque axis and above kinematic points of lifting shear levers, which is also original solution. The mechanism is very easy and quickly assembled to frames or other mechanisms in the seat, by inserting on axes on the transversal supporting tube of the frame of the seat and by fastening by screws on the other transversal supporting tube of the frame of the seat.