Vehicle Seat Backrest Adjustment Device with Dual Control Mechanism

Solution Overview

Problem

Existing adjustment devices for vehicle seat backrests either lack fine adjustments for high-angle changes or do not allow quick adjustments of large angular amplitudes, making them inconvenient for users who need to adjust the backrest to extreme positions.

Innovation Solution

A dual-adjustment device with a rotary knob for fine adjustments and a release lever for quick adjustments, utilizing a transverse transmission system with inclined slots and radial pins to enable simultaneous control of backrest inclination on both sides of the seat, allowing both precise and large-angle changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a rotary knob is used for fine adjustment, then adjustment precision is improved, but adjustment speed deteriorates when large angular changes are needed

Engineering Contradiction:

Improveadjustment precisionVSAvoidadjustment speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The adjustment mechanism is divided into two independent parts: a rotary knob for fine adjustments and a release lever for quick adjustments. This segmentation allows each component to specialize in one type of adjustment, resolving the contradiction between precision and speed by providing two separate access paths rather than requiring one mechanism to handle both functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adjustment device incorporates multiple functions within a single integrated system. The same backrest mechanism can be adjusted both precisely (via rotary knob) and quickly (via release lever), making the system universal in handling different adjustment scenarios without requiring separate devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If a release lever is used for quick adjustment, then adjustment speed is improved, but adjustment precision deteriorates

Engineering Contradiction:

Improveadjustment speedVSAvoidadjustment precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The adjustment mechanism is divided into two independent parts: a rotary knob for fine adjustments and a release lever for quick adjustments. This segmentation allows each component to specialize in one type of adjustment, resolving the contradiction between precision and speed by providing two separate access paths rather than requiring one mechanism to handle both functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adjustment device incorporates multiple functions within a single integrated system. The same backrest mechanism can be adjusted both precisely (via rotary knob) and quickly (via release lever), making the system universal in handling different adjustment scenarios without requiring separate devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If manual rotation is required for fine adjustment, then adjustment precision is improved, but ease of operation deteriorates for large angular changes

Engineering Contradiction:

Improveadjustment precisionVSAvoidease of operation

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The adjustment mechanism is divided into two independent parts: a rotary knob for fine adjustments and a release lever for quick adjustments. This segmentation allows each component to specialize in one type of adjustment, resolving the contradiction between precision and speed by providing two separate access paths rather than requiring one mechanism to handle both functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of requiring the user to perform repetitive rotational actions for large adjustments, the design inverts the approach by providing a release lever that mechanically unlocks the backrest, allowing the user to simply push or pull the backrest into the desired position. This reverses the traditional manual adjustment paradigm and greatly improves ease of operation for large angular changes.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP3231661B1Adjustment device for adjustment the inclination of the backrest of a vehicle seat

Publication Date: 2018.12.12 MARTUR SUNGER & KOLTUK TESISLERI TICARET & SANAYI ANONIM SIRKETI

Figure 1
Figure 2
Figure 3~4

AI summary

An adjustment device for adjustment the inclination of the backrest (14) of a seat (10) of a vehicle, comprising: - a first and a second adjustment element (24, 26), respectively provided with a first array of slots (32) and a second array of slots (34) inclined to each other, - a control pin (42) rotatable about said longitudinal axis (A), comprising a threaded adjustment portion (46) and a fastening portion (48), - a central body (52) housed between said first and second adjustment element (24, 26) and having a threaded central hole (54) engaged with said a retracted position, - at least one disengagement element (66)having a plurality of cams (74)adapted to control the movement of said radial pins (56) from the extracted position to the retracted position as a result of an angular movement between the disengagement threaded adjustment portion (46) of said control pin (42), - a plurality of radial pins (56) carried by the central body (52) and movable radially with respect to the central body (52) between an extracted position and element (66) and the central body (52), and - a release element (22, 84) for imparting an angular movement about said longitudinal axis (A) to said disengagement element (66). [Figure 2]