Two-Post Vehicle Lift Arms with Offset Telescoping Reach

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Solution Overview

Problem

Existing two-post vehicle lift systems have limited range of extension and retraction of lift arms and angular movement, making them less adaptable to various vehicle sizes and configurations, and often require manual adjustment which is cumbersome and limited by friction and structural weaknesses.

Innovation Solution

The implementation of offset telescoping lift arms with a radially offset pivot axis and a rotation lock mechanism allows for greater extension and retraction of lift arms, enabling improved angular movement and manual adjustment, and the ability to swap arms laterally between posts for enhanced adaptability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If telescoping lift arm sections are used to enable extension and retraction, then the adaptability to various vehicle sizes is improved, but the structural strength is weakened due to progressively smaller cross-sectional dimensions of inner sections

Engineering Contradiction:

Improveadaptability to various vehicle sizesVSAvoidstructural strength of lift arm sections

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent implements telescoping lift arm sections where inner arm sections are nested within outer arm sections, allowing extension and retraction to accommodate different vehicle sizes. The nested configuration enables compact storage when retracted and extended reach when needed, directly resolving the adaptability requirement.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent introduces a radially offset pivot axis that is offset from the longitudinal axis of the lift arm by a predetermined offset distance. This asymmetric configuration creates space for the telescoping sections to move radially without interfering with the pivot mechanism, allowing full extension and retraction while maintaining structural integrity.

Inventive Principle:

Principle #4Asymmetry

2Device complexity

If the pivot axis is positioned at the end of the lift arm to simplify structure, then the device complexity is reduced, but the range of angular movement is limited due to interference from telescoping sections

Engineering Contradiction:

Improvestructural simplicityVSAvoidrange of angular movement

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent moves the pivot axis from the traditional end-position to a radially offset position. This dimensional change in the pivot axis location creates a new spatial relationship where the telescoping sections move in a radial direction while the arm pivots about the offset axis, enabling greater angular movement without structural interference.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If extension stop members are engaged to limit cantilever load, then the reliability is improved, but the range of extension is reduced

Engineering Contradiction:

Improveload bearing reliabilityVSAvoidextension range of lift arm

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent implements dynamic extension and retraction stops that can selectively engage and disengage. The stops are positioned to limit extension when full load-bearing capacity is required, but can be moved or disengaged to allow greater extension ranges when load conditions permit, providing dynamic adaptability rather than fixed limitations.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12454447B2Two post lift with reversible offset telescoping lift arms

Publication Date: 2025.10.28 BENDPAK INC

AI summary

A telescoping lift arm for a two-post vehicle lift has pivot structure radially offset from a longitudinal axis of the arm. An outer arm section is open at a distal end to enable an inner arm section to be retracted therethrough. A pair of the arms are bilaterally symmetrical and configured to be removable from lift carriages to enable lateral swapping of the arms.