Grabber Arm Ratcheting Lock for Low-Power Position Holding

Solution Overview

Problem

Existing refuse collection vehicles require continuous electrical power to maintain the grabber arms in open or closed positions, leading to high energy consumption and potential wear on motors.

Innovation Solution

A ratcheting pawl mechanism is used to mechanically lock the grabber arms in the desired position, eliminating the need for continuous motor power and reducing energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous motor power is used to maintain grabber arms in position, then the grabber arms can be held in open or closed positions, but energy consumption increases and motor wear increases

Engineering Contradiction:

Improvegrabber arm position stabilityVSAvoidmotor energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the electrical motor system with a mechanical ratcheting pawl system. The ratcheting pawl mechanically locks the grabber arms in position, eliminating the need for continuous motor power to maintain position. The motor is only required to move the pawl between engaged and disengaged positions, significantly reducing energy consumption while maintaining position stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Instead of continuous motor operation to hold position, the system uses periodic action where the motor only operates briefly to engage or disengage the ratcheting pawl. Once engaged, the mechanical lock maintains position without continuous power input, transforming continuous energy consumption into periodic, intermittent operation.

Inventive Principle:

Principle #19Periodic action

2Reliability

If continuous motor power is used to maintain grabber arms in position, then the grabber arms can be held in open or closed positions, but motor lifespan decreases due to wear

Engineering Contradiction:

Improvegrabber arm position stabilityVSAvoidmotor lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent replaces the electrical motor system with a mechanical ratcheting pawl system. The ratcheting pawl mechanically locks the grabber arms in position, eliminating the need for continuous motor power to maintain position. The motor is only required to move the pawl between engaged and disengaged positions, significantly reducing energy consumption while maintaining position stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Instead of continuous motor operation to hold position, the system uses periodic action where the motor only operates briefly to engage or disengage the ratcheting pawl. Once engaged, the mechanical lock maintains position without continuous power input, transforming continuous energy consumption into periodic, intermittent operation.

Inventive Principle:

Principle #19Periodic action

3Use of energy by moving object

If a ratcheting pawl mechanism is used to mechanically lock grabber arms, then energy consumption is reduced, but device complexity increases

Engineering Contradiction:

Improvemotor energy consumptionVSAvoidgrabber assembly structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The ratcheting pawl mechanism is integrated into the existing grabber arm assembly, merging the locking function with the existing structural components. The pawl interacts with existing gears and linkages, combining multiple functions (positioning, locking, and mechanical advantage) into a unified mechanism that reduces overall system complexity despite adding the ratcheting feature.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260048934A1Ratcheting lock for grabber assembly

Publication Date: 2026.02.19 HEIL CO

AI summary

A refuse collection vehicle including a wheeled vehicle chassis and a refuse collection body coupled to the wheeled vehicle chassis. The refuse collection body has a grabber assembly to engage a refuse container and position the refuse container relative to the refuse collection body. The grabber assembly includes a first grabber arm, a second grabber arm, and a ratcheting pawl. The first grabber arm and the second grabber arm move between an open position and a closed position. The ratcheting pawl is operable between an engaged position and a disengaged position. The ratcheting pawl is configured to prevent rotation of the first grabber arm and the second grabber arm when the ratcheting pawl is in the engaged position.