Control Device Shaft Adjustment Using Fixed Stops

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Solution Overview

Problem

The initial adjustment method for control devices with articulated structures is difficult due to the lack of precise and reliable preload application, and simultaneous adjustment of multiple shafts is challenging, leading to inconsistencies and potential interference between adjustments.

Innovation Solution

A method involving the application of a predetermined preload to each shaft to take up assembly play, followed by the provision of a fixed adjustment stop using an adhesive or resin plug immobilized relative to the lower mounting, allowing for precise positioning and removal of the preload, enabling simultaneous adjustment of multiple shafts without interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an adjusting screw is used to take up assembly play and provide preload, then the shaft can be positioned, but the adjustment is difficult and unreliable because the screw cannot provide a known predetermined preload value precisely

Engineering Contradiction:
Improvepreload precisionVSAvoidadjustment ease
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The patent introduces a separate stop element as an intermediary component between the shaft and the adjusting screw. This stop element provides a precise mechanical limit that defines the shaft's position, while the adjusting screw merely applies preload against this stop. The stop acts as a mediator that separates the positioning function (performed by the stop's geometric constraint) from the preload application function (performed by the screw), thereby enabling precise predetermined preload values without compromising adjustment ease.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent divides the adjustment system into two distinct functional elements: a stop element that provides the positioning reference and a separate adjusting screw that applies preload. This segmentation allows each component to specialize in one function - the stop defines the precise position through its geometric constraint, while the screw independently controls the preload magnitude. This separation resolves the contradiction by making both precision and ease of operation achievable through specialized components working together.

Inventive Principle:
Principle #1Segmentation

2Productivity

If adjusting screws are used for multiple shafts, then each shaft can be adjusted, but simultaneous adjustment is impossible because adjusting one screw affects previous adjustments on other shafts

Engineering Contradiction:
Improveadjustment speedVSAvoidadjustment consistency
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent implements preliminary action by providing fixed stop elements for each shaft before adjustment begins. These stops pre-establish the correct positioning reference for each shaft independently. Because the stops are fixed in place beforehand, they create stable reference points that prevent adjustments on one shaft from affecting others. This preliminary establishment of reference geometry enables multiple shafts to be adjusted simultaneously or in any sequence without interference, thereby improving both productivity and reliability.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent inverts the traditional adjustment approach by making the stop elements fixed and immutable rather than adjustable. Instead of using adjustable stops that can drift when other components are modified, the stops are fixed to provide stable reference points. This inversion - making the reference elements fixed rather than adjustable - allows multiple shafts to be adjusted independently without mutual interference, resolving the contradiction between adjustment speed and consistency.

Inventive Principle:
Principle #13The other way round (Inversion)

3Stability of the object's composition

If the adjusting screw is immobilized after taking up play, then the shaft position is fixed, but the preload applied cannot be known or controlled to a predetermined value

Engineering Contradiction:
Improveshaft position stabilityVSAvoidpreload value precision
Core Design Contradiction:
Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent introduces a stop element as an intermediary that provides a precise geometric reference for shaft positioning. The stop element's fixed geometry defines the exact position where the shaft should be held, independent of the preload magnitude. This intermediary reference allows the system to achieve stable shaft positioning through the stop's geometric constraint while separately controlling preload through the adjusting screw, thereby enabling known predetermined preload values without compromising position stability.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the positioning and preload control functions into separate elements: the stop element handles positioning stability through its fixed geometry, while the adjusting screw independently controls preload magnitude. This segmentation allows each function to be optimized separately - the stop provides stable positioning reference, and the screw provides precise preload control - resolving the contradiction between position stability and preload precision.

Inventive Principle:
Principle #1Segmentation

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 method ensures precise and reliable initial adjustment of control devices, allowing for consistent operation and preventing play-related issues, while enabling simultaneous adjustment of all shafts without affecting previous settings.

Implementation Method 1

providing an adjustment stop, fixed relative to the lower mounting and forming a stop surface which interacts with a facing portion of said at least one shaft associated with this stop

Methodology Applied
Scientific EffectAdhesive: Adhesive

Data Source

PatentEP2860609B1Method for the initial adjustment of a control device for electronic equipment
Publication Date: 2017.08.02 C&K COMPONENTS SAS
  • EP2860609B1 patent drawingFigure 1~15
  • EP2860609B1 patent drawingFigure 2
  • EP2860609B1 patent drawingFigure 3

AI summary

The invention proposes a method for the initial adjustment of a control device (20) for electronic equipment, including an upper actuating element (21), a lower supporting mounting (26), a switch (S) which is actuated by the upper actuating element (21) when the upper actuating element (21) is in its active lower position, and an articulated structure which is interposed vertically between the upper element (21) and the lower mounting (26) to keep the upper element (21) parallel to a horizontal plane during its vertical downward movement, and which includes at least one shaft (L), characterized in that the method consists of the following successive steps: - a) applying, in the vertical direction (V), a preload (P) having a predetermined value to said at least one shaft (L) so as to take up the initial assembly play; - b) providing an adjustment stop (104, PC), fixed relative to the lower mounting (26) and forming a stop surface which interacts with a facing portion of said at least one shaft (L) associated with this stop, for positioning said at least one shaft relative to the lower mounting (26); -c) removing said preload (P).