Sheath-Protected Flexible Shaft Drive for Higher Drain Cleaning Torque

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Solution Overview

Problem

Existing drain cleaning systems, such as FlexShaft, face limitations in torque delivery, requiring high rotational speeds to scrape blockages rather than efficiently tearing through them, leading to inefficient cleaning processes.

Innovation Solution

A drain cleaning apparatus featuring a drum housing with a rotatable cable carrier and transmission assembly that effectively transfers rotary power from a power source to the drain cleaning cable, enhancing torque delivery and cleaning efficiency through a combination of high RPM and controlled power distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high rotational speed is used to clean blockages, then cleaning capability is improved, but torque delivery deteriorates

Engineering Contradiction:

Improverotational speedVSAvoidtorque

Core Design Contradiction:

SpeedVSForce

Solution Approach 1:

The cable carrier is designed to rotate dynamically within the drum housing, allowing the system to adapt between high-speed low-torque and controlled-speed high-torque operations. The rotatable cable carrier enables flexible power transmission that can accommodate varying operational demands.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transmission assembly enables changing operational parameters by allowing the cable to be driven at different rotational speeds and torques depending on the blockage conditions. The system can switch between scraping mode (high speed) and tearing mode (high torque) based on operational needs.

Inventive Principle:

Principle #35Parameter changes

2Power

If the cable carrier rotates within the drum housing, then power transmission is improved, but wear on the drum increases

Engineering Contradiction:

Improvepower transmissionVSAvoidwear on drum

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The rotatable cable carrier acts as an intermediary between the drum housing and the flexible shaft cable. It transfers power while isolating the drum housing from direct contact with the rotating cable, thereby reducing wear on the drum while maintaining effective power transmission.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Force

If transmission assembly is mounted on cable carrier, then torque delivery is improved, but device complexity increases

Engineering Contradiction:

Improvetorque deliveryVSAvoiddevice complexity

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The transmission assembly is integrated with the rotatable cable carrier, combining multiple functions into a single unified structure. This merging reduces the number of separate components and simplifies the overall device while maintaining effective torque delivery to the cable.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10987708B2Drain cleaning systems using sheath protected flexible shaft

Publication Date: 2021.04.27 RIDGE TOOL CO

AI summary

A drain cleaning apparatus is described that uses a FlexShaft type drain cleaning cable. The drain cleaning apparatus includes a drum housing, a rotatable cable carrier mounted within an interior of the drum housing and a transmission assembly for transferring rotary power to an end of a FlexShaft cable residing in the interior of the drum housing. Also described are systems using these apparatuses in combination with a rotary power source such as a drill. In addition, various methods of use are described.