Detachable Handle Coupling With Spring Cam Play Compensation
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Solution Overview
Problem
Form fit-locking connections in gardening equipment suffer from play that can lead to operational difficulties and safety concerns, particularly when the operating button is accidentally pressed, causing the handle to detach undesirably.
Innovation Solution
Integration of a pressure cam with a preloaded leaf spring or elastic element into the guide piece that engages with the handle insert pin, providing play compensation and enhanced safety by ensuring the handle remains attached during accidental button presses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a form fit-locking connection is used between the implement and handle, then the device allows quick attachment and detachment with multiple handle length options, but play develops at the joint causing operational difficulties and safety concerns
Solution Approach 1:
The pressure cam is pre-loaded by the leaf spring to engage with the handle insert pin before any accidental detachment can occur. This preliminary engagement action ensures that the safety mechanism is already in place, preventing play-related operational issues while maintaining quick attachment/detachment capability through the button-operated release system.
Solution Approach 2:
The leaf spring provides a cushioning force that continuously presses the pressure cam against the handle insert pin, creating a safety buffer that compensates for joint play. This beforehand cushioning ensures that even if the operating button is accidentally pressed, the pre-loaded spring maintains sufficient engagement force to prevent unintended detachment.
2Ease of operation
If the operating button is accidentally pressed in a form fit-locking connection, then the handle can be detached, but this creates safety hazards for bystanders
Solution Approach 1:
The pressure cam, pre-loaded by the leaf spring, creates a counteracting force that opposes any accidental detachment force. When the operating button is accidentally pressed, the pre-loaded spring maintains sufficient engagement force to prevent the handle from detaching, thereby neutralizing the harmful effect before it can cause danger to bystanders.
Solution Approach 2:
The leaf spring provides a cushioning safety margin that absorbs accidental button presses. The pre-loaded spring ensures that the engagement force exceeds normal operational forces, creating a buffer zone that prevents hazardous detachment while preserving the ease of intentional release through the button mechanism.
3Reliability
If a screw-based force fit-locking connection is used, then play is eliminated from the joint, but the operation becomes time-consuming and cumbersome
Solution Approach 1:
The invention extracts the play-compensating function from the traditional screw-based force fit connection and transfers it to a spring-loaded pressure cam mechanism. This extraction allows the system to eliminate joint play through elastic pre-loading while maintaining the simplicity and speed of form fit-locking button-operated attachment and detachment.
Solution Approach 2:
The invention substitutes the manual screw-based mechanical fastening system with an elastic spring-loaded pressure cam system. This replacement eliminates the time-consuming screw operation while achieving play elimination through the elastic pre-loading mechanism, thereby improving both operation speed and joint stability.
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 solution effectively eliminates tactile play and enhances safety by securely holding the handle in place, even during unintended movements, while allowing for adjustable safety retention force through design parameters.
Implementation Method 1
at least one further leaf spring or another elastic element is integrated into the guide piece and has a play-compensating effect
Implementation Method 2
a pressure cam that, under pressure, meshes into a recess on the side surface of the handle insert pin, which preferably has a rectangular cross section, and clamps the handle insert pin
Data Source
AI summary
A handle fastening coupling, preferably for household and gardening implements comprises a guide piece (12) that is pressed into a handle-tube end and has an elongated guide channel (14) for a handle insert pin (3), which has a first end fastened to the implement and second free end, wherein the second end has a lock opening (6); and a locking element (20) that is preloaded by a latch spring (18) in a first radial direction perpendicular to the handle axis and that is designed to snap into the lock opening of the handle insert pin, wherein the locking element can be moved out of the lock opening in the radial direction by an operating button in order to release the handle insert pin (3) to pull it out of the guide channel.